• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a writing or coloring pencil comprising the following 3 layers obtained by coextrusion: an unexpanded polymer-based mine, an unexpanded protective intermediate layer surrounding the mine and comprising an ethylene (C 1 -C 4) alkyl copolymer acrylate alone or in admixture with a styrenic polymer and - an expanded wood synthetic material based on a styrenic polymer surrounding the protective interlayer.
    公开号:FR3052705A1
    申请号:FR1655767
    申请日:2016-06-21
    公开日:2017-12-22
    发明作者:Julien Gouerec；Philippe Lefebvre
    申请人:Conte SA；
    IPC主号:
    专利说明:

    The present invention relates to writing or coloring crayons obtained by coextrusion comprising a polymer-based mine and a synthetic wood material.
    Such writing or coloring pencils are known to those skilled in the art.
    In particular the application WO01 / 43987 indicates that these rods must comprise an intermediate protective layer whose thermoplastic material must have a point of solidification below the solidification point of the thermoplastic material of the mine in order to avoid the problems of cracking of the mine during its cooling.
    However, the only sheath materials indicated are, as thermoplastic material, a styrenic polymer mixed with an elastomeric thermoplastic, for example of the SBS (styrene butadiene styrene) type or an ethyl-vinyl-acetate (EVA) copolymer in proportions of 95/5 to 70 With an example of a styrene / EVA polymer blend at 80/20 or 83/15 or in the case of SBS a styrene polymer / thermoplastic elastomer blend at 88/10.
    It also indicates the possible use in the protective sheath of a thermoplastic material based on thermoplastic elastomer.
    However, the inventors have surprisingly found that when LEVA is replaced by an ethylene (C 1 -C 4) alkyl acrylate copolymer, in particular ethylene butyl acrylate (EBA) copolymer, the sheath has a better adhesion with the mine, which avoids in some cases, especially for fine mines, shooting mines problems and in any case the risk of decohesion between the mine and the protective layer during the cutting operation, which is not desirable.
    None of the prior art known to date describes such a solution to the problem of adhesion between the polymer-based mine and the protective sheath.
    Thus, the application W02010 / 006744 also describes the compulsory presence of an adhesion layer between the mine and the synthetic wood material for the rods whose polymer of the mine is incompatible with the polymer of the synthetic wood material. However, the material indicated for this layer is preferably a styrene-butadiene copolymer and / or a styrene / ethene-butadiene / styrene block copolymer.
    The application US 2006/0194049 also describes the presence of a protective envelope of the mine which has a bending strength greater than that of the mine and which will therefore stabilize the mine to prevent it from breaking. However, it is stated that the composition of the envelope will be similar to that of the mine.
    The present invention therefore relates to a writing or coloring pencil comprising the following 3 coextruded layers: an unexpanded polymer-based mine, an unexpanded protective intermediate layer surrounding the mine and comprising an ethylene (C 1 -C 4) alkyl copolymer ) acrylate alone or in admixture with a styrenic polymer and an expanded wood synthetic material based on a styrenic polymer surrounding the protective interlayer.
    The pencil according to the present invention therefore comprises a polymer-based mine.
    In the sense of the present invention, the term "polymer-based mine" means any pencil lead to be written or colored comprising at least one polymer.
    In an advantageous embodiment, the polymer of the mine is selected from styrenic polymers and polyolefins.
    In the case where the mine comprises a polyolefin, it will be referred to in the context of the present invention "polyolefin-based mine". Thus, in the sense of the present invention, the term "polyolefin-based mine" means any pencil or coloring pencil lead comprising at least one polyolefin. Advantageously in a polyolefin-based mine according to the invention, the polyolefin is the main polymer of the mine. Even more advantageously, the polyolefin-based mine does not include other polymers. Advantageously, the polyolefin may be polyethylene or polypropylene, in particular polypropylene, more particularly polypropylene homopolymer. In the case where the mine comprises a styrenic polymer, it will be called in the context of the present invention "styrenic polymer-based mine".
    Thus, in the sense of the present invention, the term "styrenic polymer-based mine" means any pencil or coloring pencil mixture comprising at least one styrenic polymer. Advantageously in a styrenic polymer-based mine according to the invention, the styrenic polymer is the main polymer of the mine. Even more advantageously, the styrenic polymer-based mine does not include other polymers. Advantageously, the styrenic polymer is polystyrene (PS), styrene acrylonitrile (SAN) or acrylonitrile butadiene styrene (ABS), in particular acrylonitrile butadiene styrene (ABS).
    Thus advantageously the polymer of the mine is selected from acrylonitrile butadiene styrene and polypropylene.
    Advantageously, the content of polymer, in particular of styrenic polymer or polyolefin, of the mine is between 15 and 45% by weight relative to the total weight of the composition of the mine, advantageously between 25 and 40% by weight relative to to the total weight of the composition of the mine.
    The mine according to the present invention may be a pencil lead or a pencil lead.
    In the case where the polymer-based mine according to the present invention is a paper pencil lead, it may comprise a content of polymer, in particular of styrenic polymer or polyolefin, of between 15 and 40% by weight, advantageously between 20 and 40% by weight. and 35% by weight, based on the total weight of the composition of the mine.
    In the case where the mine according to the present invention is a colored pencil lead, it may comprise a content of polymer, in particular of styrenic polymer or polyolefin, of between 25 and 45% by weight, advantageously between 30 and 40% by weight. , relative to the total weight of the composition of the mine.
    The mine according to the present invention may also comprise mineral fillers, pigments, plasticizers and / or additives. Advantageously, the polyolefin-based mine does not include plasticizer.
    Advantageously, the pigment content of the mine is between 5 and 30% by weight, the mineral filler content between 5 and 75% by weight and / or the content of additives and / or plasticizers between 0 and 50% by weight, by relative to the total weight of the composition of the mine.
    In the case where the mine according to the present invention is a pencil lead of paper, it may comprise graphite and possibly a colorless mineral filler. In particular, it comprises graphite and a colorless mineral filler. Advantageously, the colorless inorganic filler is chosen from clay, talc, boron nitride, silica, calcium carbonate, mica, steatite powder and mixtures thereof. Particularly advantageously, it is a lamellar filler, more particularly chosen from clay, boron nitride, mica and / or talc, for example a clay, in particular chosen from montmorillonite, bentonite and kaolin. . Advantageously it is kaolin.
    Advantageously, the graphite content of the pencil lead according to the present invention is between 40 and 60%, in particular between 44 and 50%, by weight relative to the total weight of the composition of the mine.
    Advantageously, the content of colorless inorganic filler of the pencil lead according to the present invention is between 5 and 15%, in particular between 6 and 10%, by weight relative to the total weight of the composition of the mine.
    It may further comprise as a carbon black pigment. Advantageously, the carbon black content of the pencil lead according to the present invention is between 5 and 20%, in particular between 5 and 15%, by weight relative to the total weight of the composition of the mine.
    In the case where the mine according to the present invention is a colored pencil lead, the mineral filler is a colorless inorganic filler, particularly as described above.
    Advantageously, the colorless mineral filler content of the colored pencil lead according to the present invention is between 5 and 50%, in particular between 10 and 40%, by weight relative to the total weight of the composition of the mine.
    The additives used in the mine according to the present invention may be selected from gelling agents, processing agents, blowing agents, dispersing agents, lubricants and other additives well known to those skilled in the art. For example, it may be stearate (zinc stearate, calcium, magnesium, sodium and their salts, in particular calcium stearate), waxes, paraffins, fatty acids, amides such as stearamide, in particular ethylene bis stearamide, glycerol and its derivatives such as glycerol dibehenate, glycerol behenate, glycerol stearate and / or polyglycerol diisostearate, siloxane grafted onto polypropylene and their mixtures, in particular it is calcium stearate, magnesium stearate, zinc stearate, amides or their mixture.
    The mine of the present invention is unexpanded. Thus, no blowing agent is used during its manufacturing process. In addition, the polymer used is not foamed.
    In a particular embodiment of the present invention, the mine has a diameter of between 2 and 3.8 mm.
    In particular in the case of fine mines, the mine has a diameter of between 2 and 2.3 mm.
    In this case, advantageously, in the case of thick protective intermediate layers, the thickness ratio of the protective intermediate layer / radius of the mine is between 0.05 and 0.16, advantageously between 0.06 and 0.15, more advantageously between 0.07 and 0.15.
    In the case of thick mines, the mine has a diameter between 3 and 3.8 mm and very thick mines, the mine has a diameter between 3.4 and 3.8 mm. In this case, advantageously in the case of thick protective intermediate layers, the thickness ratio of the protective intermediate layer / radius of the mine is between 0.07 and 0.16, advantageously between 0.08 and 0.15, more advantageously between 0.09 and 0.15.
    The mine according to the present invention must therefore comprise charges and pigments for writing easily transferable on the writing medium or coloring pigments to have a good hiding power. Advantageously, the mine according to the present invention may have a hexagonal, round or triangular section, advantageously round or hexagonal.
    The pencil according to the present invention comprises an unexpanded protective intermediate layer surrounding, advantageously concentrically, the mine and comprising an ethylene (C 1 -C 4 alkyl) acrylate copolymer alone or in admixture with a styrenic polymer. This intermediate layer has a dual role:
    Firstly, it will make it possible to ensure adhesion between the polymer-based mine, in particular based on polyolefin, and the synthetic wood material based on a styrenic polymer.
    It will also make it possible to compensate for the withdrawal of the mine during the cooling step after the coextrusion step, which will avoid the problems of cracking of the mine.
    This protective intermediate layer will thus completely separate the mine from the synthetic material of wood.
    In an advantageous embodiment, the protective interlayer has a thickness of between 0.05 and 0.31 mm, more preferably between 0.07 and 0.27 mm, in particular between 0.08 and 0.17 mm.
    In particular in the case of color pencil leads, the protective interlayer advantageously has a thickness of between 0.05 and 0.10 mm, advantageously between 0.06 and 0.09 mm, in particular between 0.07 and 0. , 09 mm.
    Advantageously in this case the protective intermediate layer is of the same color as the wood material or the mine, in particular the wood material, and is therefore invisible.
    In the case of pencil leads, the protective interlayer preferably has a thickness of between 0.11 and 0.31 mm, more preferably between 0.13 and 0.27 mm, in particular between 0.14 and 0, 17 mm.
    Advantageously, in this case, the protective intermediate layer has a color different from that of the wood material or that of the mine and is therefore visible.
    The protective interlayer according to the present invention comprises an ethylene (C 1 -C 4 alkyl) acrylate copolymer alone or in admixture with a styrenic polymer, advantageously it consists of an ethylene (C 1 -C 4 alkyl) acrylate copolymer alone or in admixture with a styrenic polymer, in particular in a mixture with a styrenic polymer.
    For the purposes of the present invention, the term "C 1 -C 4 alkyl" means any linear or branched alkyl group having between 1 and 4 carbon atoms, such as, for example, the methyl, ethyl, propyl, n-propyl or isopropyl group, butyl, n-butyl, tert-butyl, isobutyl. Advantageously, it is a methyl, ethyl, butyl, n-butyl, isobutyl or tert-butyl group, in particular a butyl, n-butyl, isobutyl or tert-butyl group, more particularly a n-butyl group. butyl.
    Advantageously, the ethylene (C 1 -C 4) alkyl acrylate copolymer is chosen from the ethylene methyl acrylate copolymer, the ethylene ethyl acrylate copolymer and the ethylene butyl acrylate copolymer, in particular it is the ethylene butyl acrylate copolymer, such as the ethylene n-butyl acrylate copolymer.
    Advantageously, the styrenic polymer is styrene acrylonitrile polystyrene or acrylonitrile butadiene styrene (ABS), in particular polystyrene or acrylonitrile butadiene styrene. In particular, polystyrene is an atactic polystyrene. It may be a crystal polystyrene.
    Thus, advantageously, the unexpanded protective intermediate layer surrounding the mine comprises ethylene butyl acrylate copolymer mixed with polystyrene or acrylonitrile butadiene styrene (ABS). In the context of the present invention, the styrenic polymer is intended to allow adhesion between the protective interlayer and the synthetic wood material and to allow the good mechanical strength of this layer (resistance to cutting without fray) , especially in the case of sheaths having a large thickness (such as a thickness of between 0.11 and 0.31 mm, more preferably between 0.13 and 0.27 mm, in particular between 0.14 and 0.17 mm. mm). It may also be intended, in the case where the mine is based on styrenic polymer, to compatibilize the sheath with the mine.
    Advantageously, the ethylene (C 1 -C 4) alkyl acrylate copolymer comprises between 10 and 40% by weight of the comonomer (C 1 -C 4 alkyl) acrylate, in particular between 15 and 30% by weight, relative to the total weight of the copolymer. ethylene (C1-C4) alkyl acrylate.
    Thus, advantageously, when the ethylene (C 1 -C 4) alkyl acrylate copolymer is the ethylene butyl acrylate copolymer, the latter comprises between 10 and 40% by weight of the butyl acrylate comonomer, in particular between 15 and 30% by weight, relative to total weight of ethylene butyl acrylate copolymer
    In the context of the present invention, the ethylene (C 1 -C 4) alkyl acrylate copolymer, in particular the ethylene butyl acrylate copolymer, is intended to allow adhesion between the protective intermediate layer and the mine and to reduce the solidification point. (commonly referred to as softening point) of the intermediate protective sheath, particularly styrenic polymer when present, such as polystyrene, styrene acrylonitrile or acrylonitrile butadiene styrene (ABS), so that the solidification of the cladding, in particular of the styrenic polymer and ethylene (C1-C4 alkyl) acrylate copolymer mixture, is less than the solidification point of the polymer (advantageously ABS or polypropylene) of the mine.
    In an advantageous embodiment, the content of the ethylene (C 1 -C 4) alkyl acrylate copolymer of the sheath is between 20 and 100% by weight, advantageously between 25 and 60% by weight, more advantageously between 30 and 55% by weight. weight, relative to the total weight of the composition of the sheath (100% corresponds to a protective interlayer consisting of ethylene (C1-C4 alkyl) acrylate copolymer).
    In particular, when the sheath comprises a mixture of ethylene (C 1 -C 4 alkyl) acrylate copolymer with a styrenic polymer, the content of the mixture of the protective intermediate layer is between 85 and 100% by weight relative to the total weight of the protective interlayer (100% corresponds to a protective interlayer consisting of a mixture of ethylene (C 1 -C 4 alkyl) acrylate copolymer with a styrenic polymer), advantageously between 90 and 97% by weight relative to the total weight of the intermediate layer protective, more preferably between 93 and 96% by weight relative to the total weight of the protective interlayer.
    The protective interlayer may further comprise pigments, such as a masterbatch, in particular based on polystyrene, which serve in particular to bring color to this layer. Advantageously, the pigment content of this layer is between 3 and 10% by weight relative to the total weight of the protective interlayer, more advantageously between 4 and 7% by weight relative to the total weight of the protective interlayer.
    In a particular embodiment the protective interlayer has a different color of the mine and the synthetic wood material. This allows this layer to be visible to the consumer, which may have an aesthetic interest and can play with different colors to make the pencil very distinctive and attractive.
    In another advantageous embodiment, this layer has the same color as that of the mine, which allows to give the consumer the impression that the pencil has a thicker mine or to hide the presence of this sheath.
    In yet another advantageous embodiment, this layer has the same color as that of the synthetic wood material, which makes it possible to hide the presence of this sheath and thus to make it invisible. Advantageously, the content of styrenic polymer, when present, in particular polystyrene or acrylonitrile butadiene styrene (ABS), of the protective interlayer is between 25 and 90% by weight, more advantageously between 30 and 75% by weight. more preferably between 35 and 70% by weight, based on the total weight of the protective interlayer.
    In addition, the protective intermediate layer is unexpanded. Thus, no blowing agent is used during its manufacturing process. In addition, the styrenic polymer used is not expanded.
    In addition, advantageously the protective intermediate layer does not have a greater bending strength than that of the mine.
    In addition, advantageously the protective intermediate layer does not have the same function as the mine, that is to say is not intended for writing or coloring. The pigments possibly present in this layer are therefore not easily transferable to the writing medium and therefore do not have a good hiding power.
    On the other hand, it advantageously has a melting temperature equal to or lower than both that of the mine and that of the synthetic wood material.
    In an advantageous embodiment, the protective intermediate layer has a thickness of between 0.11 and 0.31 mm, advantageously between 0.13 and 0.27 mm, in particular between 0.14 and 0.17 mm.
    In this case, advantageously, the ethylene (C 1 -C 4) alkyl acrylate copolymer content of the sheath is between 25 and 50% by weight, advantageously between 30 and 40% by weight, relative to the total weight of the composition of the composition. sheath.
    Advantageously, in this case, the protective intermediate layer has a color different from that of the wood material or that of the mine and is therefore visible. This is particularly the case of protective intermediate layers for pencil according to the invention.
    In another advantageous embodiment, the protective intermediate layer has a thickness of between 0.05 and 0.10 mm, advantageously between 0.06 and 0.09 mm, in particular between 0.07 and 0.09 mm.
    In this case, advantageously, the content of the ethylene (C 1 -C 4) alkyl acrylate copolymer of the sheath is between 25 and 100% by weight, advantageously between 35 and 60% by weight, more advantageously between 45 and 55% by weight. , relative to the total weight of the composition of the sheath.
    In particular advantageously in this case the protective intermediate layer is the same color as the wood material or that the mine, in particular the wood material, and is therefore invisible. This is particularly the case of the intermediate protective layers for colored pencil according to the invention.
    The pencil according to the present invention further comprises an expanded wood synthetic material based on styrenic polymer and surrounding, advantageously concentrically, the protective interlayer.
    Within the meaning of the present invention, the term "synthetic wood material" is understood to mean any synthetic material of a writing or coloring pencil based on a polymer whose density and cutability are close to those of wood.
    For the purposes of the present invention, the term "synthetic wood material based on styrenic polymer" means any synthetic wood material as defined above comprising at least one styrenic polymer, that is to say a polymer or copolymer with styrene base. Advantageously, the styrenic polymer is the main polymer of the wood synthetic material. Even more advantageously, the synthetic wood material does not include other polymers. Advantageously, the styrenic polymer may be polystyrene, ABS (acrylonitrile-butadiene-styrene) or a polystyrene methacrylate copolymer, in particular it is polystyrene, more particularly atactic polystyrene.
    Advantageously, the content of styrene polymer, in particular polystyrene, of the synthetic wood material is between 60 and 100% by weight, advantageously between 70 and 98% by weight, in particular between 80 and 95% by weight, by weight. in relation to the total weight of the synthetic wood material.
    The synthetic wood material may contain, in addition to the styrenic polymer, pigments (a few% by weight, in particular between 0 and 5% by weight, advantageously between 0.5 and 2% by weight, relative to the total weight of the composition of synthetic wood material), such as a masterbatch and / or red iron oxide, in particular for imparting a color similar to wood to synthetic wood material, plasticizers, sawdust, mineral fillers (a few% by weight, advantageously between 0 and 10% by weight, in particular between 2 and 6% by weight, more particularly between 3 and 5% by weight, relative to the total weight of the composition of the synthetic material; of wood), in particular colorless such as clays, for example kaolin, and / or other additives such as calcium stearate and / or stearamide (a few% by weight, advantageously between 0 and 5% by weight, in particular between 1 and 3% by weight, relative to the weight to tal of the composition of the synthetic wood material).
    The synthetic wood material is expanded to obtain a density close to that of wood. To obtain an expanded wood synthetic material, advantageously an expanding agent, such as for example azo-dicarbonamide, has been added to the composition of the synthetic wood material before extrusion.
    Since the three layers can be obtained by coextrusion, the pencil according to the present invention can be manufactured by a continuous process. In particular this process is as described in WO01 / 43987. The set of the pencil according to the present invention must have a good cut and a density close to that of the traditional wooden pencil.
    In a particular embodiment of the present invention, the writing or coloring pencil according to the invention comprises an additional decorative layer, preferably varnish, surrounding, in particular concentrically, the synthetic wood material. Advantageously, the decorative layer is made of a material compatible with that of the synthetic wood material.
    Advantageously, the writing or coloring pencil according to the present invention may have a hexagonal, round or triangular section, advantageously round or hexagonal.
    Advantageously, it may include a means for erasing, such as an eraser, at the uncut end of the pencil. The invention will be better understood on reading the description of the figures and examples which follow.
    Figure 1 shows a cross section of an example of a pencil with hexagonal section according to the invention.
    FIG. 2 represents a perspective view of the example of a hexagonal pencil according to the invention. The example of pencil of hexagonal section 4 according to the invention shown in Figures 1 and 2 thus comprises four layers, the mine (1) of circular section, the protective intermediate layer (2) of circular section which surrounds concentric mine (1), the foamed plastics material (3) of hexagonal section concentrically surrounding the protective interlayer and a decorative layer (5) of hexagonal section which concentrically surrounds the synthetic wood material.
    The protective interlayer 2 has a different color of the mine and the wood synthetic material and is therefore visible both on the cross section of the pencil (Figure 1) but also on the cut portion of the pencil (Figure 2).
    Example 1: polyolefin-based mine
    A pencil of hexagonal section as illustrated in Figures 1 and 2 or triangular section according to the invention was manufactured by coextrusion.
    The compositions of the different layers are as follows: • lead: polypropylene (PP, 25-35%), graphite (40-50%) + additives / pigments • protective interlayer: polystyrene or ABS (50-70%), Ethylene butyl acrylate (EBA) (30-50%) + pigments • synthetic wood material (3): polystyrene (90-95%) + additives / pigments / colorless mineral filler The thickness of the protective interlayer is 0.15mm and that of the 2.3mm mine.
    A visual check is performed after the sharpening step of the pencil.
    We observe a good adhesion and a very good cut.
    If we compare this pencil with a pencil obtained under the same conditions but with a sheath comprising: polystyrene or ABS (60-80%), EVA (20-40%) + pigments, we observe a better adhesion of the sheath with the mine in the pencil according to the present invention.
    Example 2: Styrenic polymer-based mine
    A colored pencil of hexagonal section as illustrated in FIGS. 1 and 2 or of triangular section according to the invention was manufactured by coextrusion.
    The compositions of the different layers are as follows: • mine: ABS (35-40%), kaolin (10-15%), calcium stearate (25-30%) + additives / plasticizer / pigments (20-30%). • protective interlayer: ABS (40-60%), Ethylene butyl acrylate (EBA) (40-60%) + pigments • synthetic wood (3) polystyrene (90-95%) + additives / pigments / colorless mineral filler The thickness of the protective interlayer is 0.08mm and that of the 3.2mm mine.
    This pencil is compared with a pencil obtained under the same conditions but with a sheath comprising: polystyrene (40-60%), EVA (40-60%) + pigments in a shooting mine test.
    This test is used to verify that the mine does not separate from the wood material. TEST EQUIPMENT: - TCM 201M Dynamometer CHAΉLLON AMETEK or equivalent - Force sensor. SAMPLE USE IN THE TEST: - 50 pencils at t = 0 - 10 pencils minimum after one cycle, 24h at 0 ° C, 24h at 40 ° C. For 21 days. PROCEDURE OF THE TEST: - The set is positioned vertically in a support and goes down to 50 mm / min to come into contact with a metal plate RESULTS OF THE TEST: - The result is the measure of the force necessary to drive the mine, expressed in dAN.
    No mine is considered as shooting if the value is greater than 4 dAN.
    The pencil according to the present invention does not have a flashing effect on all the samples tested.
    On the other hand, the comparative pencils with the EVA-based sheath have a rate of mines that have spun by about 30%, half of which is less than 4 dAN considering them as shooting.
    The pencil according to the present invention with a sheath comprising ΓΕΒΑ in the place of LEVA therefore has a better adhesion between the mine and the wood material, which will avoid the possible problems of decohesion during the operation of pencil size
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    1. A writing or coloring pencil comprising the following 3 coextruded layers: an unexpanded polymer-based mine, an unexpanded protective intermediate layer surrounding the mine and comprising an ethylene (C 1 -C 4) alkyl acrylate copolymer alone or in admixture with a styrenic polymer and an expanded wood synthetic material based on a styrenic polymer surrounding the protective interlayer.
    [2" id="c-fr-0002]
    2. Writing or coloring crayon according to claim 1, characterized in that the ethylene (C1-C4 alkyl) acrylate copolymer is chosen from the ethylene methyl acrylate copolymer, the ethylene ethyl acrylate copolymer and the ethylene butyl acrylate copolymer.
    [3" id="c-fr-0003]
    3. Writing or coloring crayon according to any one of claims 1 or 2, characterized in that the ethylene copolymer (C1-C4) alkyl acrylate is the ethylene butyl acrylate copolymer.
    [4" id="c-fr-0004]
    4. Writing or coloring crayon according to any one of claims 1 to 3, characterized in that the ethylene (C1-C4 alkyl) acrylate copolymer content of the sheath is between 20 and 100% by weight, advantageously between 25 and 60% by weight, more preferably between 30 and 55% by weight, relative to the total weight of the composition of the sheath.
    [5" id="c-fr-0005]
    5. Writing or coloring pencil according to any one of claims 1 to 4, characterized in that the polymer of the mine is selected from styrenic polymers and polyolefins, preferably from acrylonitrile butadiene styrene and polypropylene.
    [6" id="c-fr-0006]
    6. Writing or coloring pencil according to any one of claims 1 to 5, characterized in that the protective intermediate layer has a thickness between 0.11 and 0.31 mm, preferably between 0.13 and 0.27 mm, in particular between 0.14 and 0.17mm.
    [7" id="c-fr-0007]
    7. Writing or coloring crayon according to claim 6, characterized in that the content of ethylene copolymer (C1-C4 alkyl) acrylate of the sheath is between 25 and 50% by weight, preferably between 30 and 40% by weight. weight, relative to the total weight of the sheath composition.
    [8" id="c-fr-0008]
    8. Writing or coloring pencil according to any one of claims 1 to 5, characterized in that the protective intermediate layer has a thickness between 0.05 and 0.10 mm, preferably between 0.06 and 0.09 mm, in particular between 0.07 and 0.09mm.
    [9" id="c-fr-0009]
    9. Writing or coloring crayon according to claim 8, characterized in that the content of ethylene (C1-C4 alkyl) acrylate copolymer of the sheath is between 25 and 100% by weight, preferably between 45 and 55% by weight. weight, relative to the total weight of the sheath composition.
    [10" id="c-fr-0010]
    10. Writing or coloring pencil according to any one of claims 1 to 9, characterized in that the mine has a diameter of between 2 and 3.8 mm.
    [11" id="c-fr-0011]
    11. Writing or coloring pencil according to any one of claims 1 to 10, characterized in that the protective interlayer has a different color of the mine and the synthetic material of wood or has the same color as that of the mine or that of synthetic wood.
    [12" id="c-fr-0012]
    12. Writing or coloring pencil according to any one of claims 1 to 11, characterized in that the styrenic polymer of the synthetic wood material is polystyrene.
    [13" id="c-fr-0013]
    13. Writing or coloring pencil according to any one of claims 1 to 12, characterized in that it is a pencil and in that the mine comprises graphite.
    [14" id="c-fr-0014]
    14. Writing or coloring pencil according to any one of claims 1 to 12, characterized in that it is a colored pencil.
    [15" id="c-fr-0015]
    15. Writing or coloring pencil according to any one of claims 1 to 14, characterized in that it comprises an additional decorative layer, preferably varnish, surrounding, preferably concentrically, the synthetic wood material.
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    RU2732375C2|2020-09-16|
    US20190322120A1|2019-10-24|
    AR108846A1|2018-10-03|
    US10814665B2|2020-10-27|
    BR112018076073A2|2019-03-26|
    RU2019100998A|2020-07-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS5270618A|1975-12-08|1977-06-13|Pentel Kk|Method of manufacturing pencil|
    US5244297A|1991-03-19|1993-09-14|Conte S.A.|Process for manufacturing pencil by tri-extrusion and the produced pencil having an intermediate protective casing|
    EP2845747A1|2013-09-09|2015-03-11|Kabushiki Kaisha Pilot Corporation|Thermochromic solid writing instrument|
    DE1561767B1|1967-10-04|1972-07-06|Bayer Ag|Pen|
    SU1623879A1|1987-07-20|1991-01-30|Уральский лесотехнический институт им.Ленинского комсомола|Pencil|
    WO1995021063A1|1994-02-07|1995-08-10|E. Khashoggi Industries|Hydraulically setting sheath and methods|
    CN1176985A|1997-09-18|1998-03-25|庞德春|Wood pencil special purpose ultra-violet cured color coating and prepn. method therefor|
    FR2802148B1|1999-12-13|2003-01-24|Conte|PROCESS FOR THE MANUFACTURE BY TRI-EXTRUSION OF A PENCIL TO BE WRITING OR TO BE COLORED AND THE PENCIL TO BE WRITING OR TO BE COLORED COMPRISING A PROTECTIVE INTERMEDIATE LAYER|
    DE20314274U1|2003-09-12|2004-05-27|Faber-Castell Ag|Wood-framed pen for writing, painting, drawing and cosmetic purposes|
    DE102005004175B4|2005-01-26|2013-11-28|J. S. Staedtler Gmbh & Co. Kg|Mine for writing, drawing or painting equipment|
    CN200970953Y|2006-09-29|2007-11-07|张国成|Pencil|
    DE102008034013B4|2008-07-15|2011-04-28|J. S. Staedtler Gmbh & Co. Kg|Use of a wood substitute material|
    DE102008034015B4|2008-07-15|2011-08-25|J. S. Staedtler GmbH & Co. KG, 90427|Writing, drawing, painting or cosmetic pencil|
    EP2390294A1|2010-05-26|2011-11-30|Université Catholique De Louvain|Pencils, method of preparation and use|
    FR3030365B1|2014-12-17|2017-01-13|Conte|PENCIL TO WRITE OR COLOR|FR3065006B1|2017-04-10|2019-06-21|Societe Bic|PENCIL MINE WITH PAPER|
    WO2020127209A1|2018-12-18|2020-06-25|Societe Bic|Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring|
    BR112021009459A2|2018-12-18|2021-08-10|Societe Bic|core wrapper for pencils, and pencils thereof for writing, drawing, marking, tracing and coloring|
    BR112021010571A2|2018-12-18|2021-08-24|Societe Bic|Core case for pencil, and pencil case for writing, drawing, marking, tracing and coloring|
    WO2020127203A1|2018-12-18|2020-06-25|Societe Bic|Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring|
    EP3845616A1|2020-01-06|2021-07-07|Société BIC|Lead for pencil for writing, drawing, marking, plotting and/or coloring|
    CN111607293A|2020-05-12|2020-09-01|苏州马培德办公用品制造有限公司|Erasable color lead material and preparation method thereof|
    法律状态:
    2017-06-27| PLFP| Fee payment|Year of fee payment: 2 |
    2017-12-22| PLSC| Search report ready|Effective date: 20171222 |
    2018-06-05| PLFP| Fee payment|Year of fee payment: 3 |
    2020-05-20| PLFP| Fee payment|Year of fee payment: 5 |
    2021-05-19| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1655767|2016-06-21|
    FR1655767A|FR3052705B1|2016-06-21|2016-06-21|PENCIL TO WRITE OR COLOR|FR1655767A| FR3052705B1|2016-06-21|2016-06-21|PENCIL TO WRITE OR COLOR|
    PCT/FR2017/051614| WO2017220914A1|2016-06-21|2017-06-20|Writing or coloring pencil|
    MX2018015590A| MX2018015590A|2016-06-21|2017-06-20|Writing or coloring pencil.|
    RU2019100998A| RU2732375C2|2016-06-21|2017-06-20|Simple or colored pencil|
    EP17742803.4A| EP3471969A1|2016-06-21|2017-06-20|Writing or coloring pencil|
    CN201780037277.3A| CN109311341B|2016-06-21|2017-06-20|Writing or colouring pencils|
    US16/311,034| US10814665B2|2016-06-21|2017-06-20|Writing or coloring pencil|
    BR112018076073-0A| BR112018076073A2|2016-06-21|2017-06-20|pencil to write or color|
    ARP170101709A| AR108846A1|2016-06-21|2017-06-21|PENCIL TO WRITE OR COLOR|
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