• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:

    公开号:SE533834C2
    申请号:SE0950214
    申请日:2009-04-02
    公开日:2011-02-01
    发明作者:Armando Cordova；Jonas Hafren；Joseph Samec；Karl Enquist
    申请人:Organoclick Ab；
    IPC主号:
    专利说明:

    533 834 US 4088530 states that synthetic polymers, polyacrylamide, have been used as an additive for dry strength.
    WO 2006/079512 discloses a process in the form of a multicomponent and multi-step process based on xyloglucan, to improve the mechanical properties of cellulose-based materials.
    Nearest known technology: SU49930 A1 shows a method for coating paper in order to find a paper that has increased wet and dry strength. SU49930 A1 describes the use of a composition containing CMC, acetic acid and formaldehyde or a formaldehyde source such as dimethylolurea. Dimethylurea and formaldehyde are both different forms of formaldehyde and they are toxic and non-environmentally friendly.
    WO2004 / 055267 A1 discloses a method for coating paper in order to find a paper with increased strength properties and relates to the same technical field as the invention. The purpose of the method iWO2004 / 055267 A1 also means to manufacture a high-quality printing paper. The object is achieved by a coating formulation containing cellulase enzyme-treated sulphate pulp (eMFC) and carboxymethylcellulose, where the pH is regulated with citric acid. The exposed micro-glasses in the eMFC contribute to the increased strength of the fiber bonds formed during the drying process of the coating formulation. As a result, eMFC is a key ingredient in this prior art to achieve the desired strength properties as well as a high-quality printing paper. There is a comparative experiment where a composition consisting of CMC and eMFC is compared with a composition consisting only of CMC and water. This experiment shows that the coating with eMFC and CMC gave the desired results while the coating with only CMC and water gave the opposite effect.
    GB766532 discloses a method for use in the technical field of planographic printing with planar information carrier pressure plates. More specifically, GB766532 comprises a method for obtaining a desired surface on a planar pressure information carrier e.g. a paper (other examples of flat pressure information carriers are, for example, metal plates, plastic plates, etc.). 533 834 The coating composition contains water and is repelled by the image (ink) on the printing plate (see claim 1) before the coating is dried.
    Other examples of prior art are shown: EP0440472 A1, GB821375, WO01 / 87365 A2, WO95 / 11925 A1, I WO2006 / 079512 A1, WO2007 / 038964A1, EP1043391 A1, GB11 1 1273, EP0614914 A2.
    Sodium carboxymethylcellulose (CMC) is an anionic, water-soluble polymer with no inherent affinity for cellulose fibers. Various methods have been developed to form bonds between CMC and cellulosic material. However, these methods are not sufficiently effective for general use in papermaking but are limited to the manufacture of specialty papers that can bear their high cost: Alum has been used as a cationic linker between CMC and cellulose (Watanabe et al, Tappi J. 2004, 3, 15). U.S. patent no. U.S. Pat. The cationic component is a polyamidoamine treated with an epoxy halohydrin.
    The method has been summarized and reviewed by Wågberg (Nord. Pulp. Pap.
    Res. J., 2000, 15, 586). Another approach to improve the dry strength of paper by co-crystallizing CMC and cellulosic fiber before or after grinding, i.e. before fi brema reaches the paper machine, is described in a doctoral dissertation by M Blomstedt ("MODELFlCATlON OF CELLULOSIC FIBERS BY CARBOXYMETHYL CELLULOSE EFFECTS ON FIBER AND SHEET PROPERTIES", Helsinki University of Technology, 2007). However, long reaction times, high pH and high amounts of CMC make this one-step process industrially disadvantageous.
    There is no high-efficiency one-step process described where CMC can be applied to paper or other brittle cellulosic products as a strength enhancer, and which is compatible with process restrictions found in paper machines. OBJECT OF THE INVENTION It is an object of the invention to provide a low cost, one-step process for improving the strength properties of a sheet-shaped breast material consisting mainly of cellulose fibers.
    A further object of the invention is to produce a sheet-shaped breast material of the kind mentioned which resists rinsing with water at neutral pH.
    Furthermore, an object of the invention is to produce a sheet-shaped breast material of said kind, the ability of which to regenerate pulp is not impaired in relation to the corresponding untreated sheet-shaped breast material.
    A further object of the invention is to provide a process of the kind mentioned which can be implemented in the paper industry without extensive modification of used equipment. Another object of the invention is to provide a procedure of the kind mentioned which is advantageous from an environmental and health perspective. Still further objects of the invention will become apparent through studies of the Summary of the Invention, a number of preferred embodiments illustrated in a drawing and the appended claims.
    SUMMARY OF THE INVENTION According to the invention, there is provided a process for improving a strength property of a sheet-shaped fibrous material consisting essentially of cellulose, the method comprising coating at least one side of the material with a coating formulation consisting of polysaccharide having at least two carboxyl groups and organic mono- low molecular weight polycarboxylic acid in an aqueous carrier, maintaining the coated surface at a temperature of 50 ° C or more for a period of time sufficient to achieve the desired improvement, drying the material.
    A preferred strength property is a dry strength property selected from tensile strength (dry) (Nlm), elongation (%), tear strength (Nm), stiffness (Nm) and Scott-Bond (J / mz).
    It is preferred that the temperature be from 70 ° C to 100 ° C or more.
    It is preferred that the heating time at a given temperature corresponds to the drying time at that temperature.
    The carboxylated polysaccharide of the invention is one which is capable of forming a sol or gel in the aqueous carrier. The carboxylated polysaccharide of the invention is preferably selected from carboxymethylcellulose (CMC); polyuronic acid such as galacturonic acid, for example as comprised of pectin, including; polyuronic acid such as mannuronic acid and guluronic acid, for example as comprised of alginic acid; oxidatively degraded polyuronic acid, for example as set forth in U.S. Pat. Patent No. 6,903,209; sodium carboxymethyl starch (CMS), for example as set forth in U.S. Pat. U.S. Patent 4,716,186; oxidized starch, for example as set forth in U.S. Pat. Patents 5,959,101 and 6,518,419; carboxymethyl hemicellulose as such and in admixture with carboxymethylcellulose, as set forth in U.S. Pat. 2005/0061204 A1; carboxymethyl lignnocellulose as disclosed in U.S. Pat. Patent No. 7,384,892. The carboxylated polysaccharide of the invention comprises its stoichiometric and non-stoichiometric sodium and potassium salts. Two or more carboxylated polysaccharides according to the invention can be used in admixture.
    The low molecular weight carboxylic acid of the invention is preferably an aliphatic carboxylic acid, most preferably a low molecular weight aliphatic di- or tri-basic carboxylic acid. In particular, the carboxylic acid according to the invention is one which is suitable for human consumption, such as acetic acid, mandelic acid, citric acid, tartaric acid, aspartic acid and glutamic acid. However, low molecular weight carboxylic acids which are less or not at all suitable for human consumption, such as formic acid, propanoic acid, butyric acid, valeric acid, oxalic acid, maleic acid, succinic acid, glutaric acid may also be used, especially for products not intended for contact with human skin. Particularly preferred are citric acid and tartaric acid. "Low molecular weight" in the case of the aliphatic organic acid according to the invention refers to molecular weights of less than 1000 Da, in particular of less than 500 Da, most preferably of less than 300 Da. Two or more carboxylic acids of the invention may be used in admixture. The aqueous carrier according to the invention is preferably water. The aqueous carrier may also contain small amounts of inorganic salts such as sodium chloride, antioxidants such as ascorbic acid, metal ion binding agents such as EDTA, neutral or acidic wetting agents, and the like. Mechanically purified water used in paper machines can also be used.
    The sheet-shaped brittle material formed from an aqueous slurry of cellulose, according to the invention, is in particular a paper-based material such as writing paper, gypsum-graded paper, kraft paper, cardboard, liquid board, corrugated paper, paper and specialty paper. The cellulosic beads in the sheet-shaped brittle material are, for example, a consequence: unbleached pulp, bleached pulp, recycled pulp, cotton pulp, straw pulp, hemp pulp, viscose. Paper pulp of any kind may be used, in particular mechanical pulp, sulphate pulp and salt pulp. The sheet-shaped brittle material according to the invention is a material which comprises one or more free surfaces to which the coating formulation can be applied.
    A sheet-shaped breast material according to the invention is also specified, mainly consisting of cellulose fibers modified by the method according to the invention. the coating or treated with the coating formulation according to the coating. The material has improved dry strength. More particularly, the present invention relates to a method of improving a strength property of a sheet-shaped fibrous material consisting essentially of cellulosic fiber, the method comprising: a) providing a sheet-shaped fibrous material formed of an aqueous slurry of cellulosic fiber; b) To provide a coating formulation consisting essentially of polysaccharide according to the invention, low molecular weight carboxylic acid according to the invention, and an aqueous carrier. c) Distributing the coating formulation on one side of the brittle material by application by spraying, brushing or gravure printing; d) Optionally, allowing the chemical formulation to be sucked into the fibrous material; e) heating the fibrous material with the chemical formulation distributed thereon at a curing temperature of 50 ° C - 100 ° C or more, preferably from 70 ° C - 100 ° C, for a period of time sufficient to increase a strength property of the dry fibrous material and to dry the material.
    The method of the invention can be applied to the wet or dry end of a paper machine.
    In the temperature range from 60 ° C to 120 ° C, the curing according to the invention is achieved by heating for about 40 minutes at the lower temperatures to for about 3 minutes at the higher temperatures. Even higher curing or drying temperatures require correspondingly shorter heating times, such as e.g. 1 min or less at 200 ° C. Alternatively, curing can be accomplished by heating the wet surface of the brittle material for a very short time at a very high temperature, such as for a fraction of a second at a temperature of about 900 ° C, by irradiating the fibrous material with an infrared radiation source. An important aspect of the process according to the invention is that curing is achieved by the normal drying temperatures and times of the paper machine. The method according to the invention does not require non-standard changes in the procedures and parameters of the paper machine on an industrial scale with which the process is carried out.
    Curing temperature and time are affected by the nature of the carboxylated polysaccharide, the carboxylic acid, their weight ratios in the support, and the physical and chemical properties of the brittle material. Suitable reaction conditions for a particular combination of carboxylated polysaccharide and carboxylic acid can be determined by one skilled in the art by performing a few simple experiments based on the present description of the invention.
    According to the invention there is further provided a coating formulation comprising or mainly consisting of the carboxylated polysaccharide according to the invention, the low molecular weight carboxylic acid according to the invention and the aqueous carrier according to the invention. The coating formulation according to the invention may further comprise paper chemicals which do not affect the strength properties of the sheet-shaped brittle material which mainly comprises or consists of cellulose fibers, in particular paper, such as wetting agents or pressure aids. The Coating Formulation of the Invention In the coating formulation of the invention, the weight ratio of low molecular weight carboxylic acid to carboxylated polysaccharide is from 0.1 parts to 30 parts of acid per 100 parts of polysaccharide, more preferably from 5 parts to 15 parts of acid per 100 parts of polysaccharide. The total concentration of carboxylated carbohydrate and organic acid in the aqueous carrier can vary from 0.1% to 30% by weight. For spray coating, a dry weight of 1% to 5% is preferred. 203 30 533 834 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram illustrating the tensile strength index of sheets of paper treated with a preparation of the invention comprising CMC and various amounts of citric acid; Fig. 2 is a graph illustrating the tensile strength index of sheets of paper treated with a preparation of the invention comprising CMC and citric acid; Fig. 3 is a graph illustrating the tensile strength index of sheets of paper treated with various amounts of a preparation of the invention comprising CMC and citric acid.
    DESCRIPTION OF PREFERRED EMBODIMENTS The present invention will now be described with reference to a number of preferred embodiments illustrated in the following examples.
    EXAMPLE 1 The effect of low molecular weight carboxylic acid / weight on the tensile strength index. Sheets of laboratory paper, 10-0 g / mz, found in a Rapid Köthen sheet former from unbleached hardwood and softwood fibers from chemical and chemo-thermal mechanical pulp were used. Aqueous chemical formulations with citric acid and CMC (Sigma-Aldrich (viscosity <200cP, (substitution graph, DS) 0.65-1.0, purity 99.5%) or Dow-Wolff (viscosity 20-1000 cP, DS 082-095, purity 99%) were applied The amount of citric acid varied between 0-0.9% by weight while the amount of CMC was kept constant at 3% by weight. The amount of formulation applied was determined gravimetrically, the sheets were heated in an oven to a temperature of 94 ° C for 10 minutes at 1 bar, and after overnight conditioning the strength properties of the sheets were examined by means of a Testometric material testing machine.
    The results are shown in Figure 1, in which blank refers to unmodified paper sheet, 0% CA refers to 3% by weight CMC, 5% CA refers to 0.15% by weight citric acid and 3% by weight CMC, etc.
    A solution prepared by adding 40 g of CMC (Sigma-Aldrich (viscosity <200cP, DS 0.65-1.0, purity 99.5%) and 4 g of citric acid to 1000 g of water gives a viscosity of = 200 cP and a solution prepared by dissolving 100 gCMC and 10 g of citric acid in 1000 g of water give a viscosity of n = 5560 cP In EXAMPLE 2 Application of the formulation according to the invention by soaking / dipping.
    Handmade paper sheets (60-140 g / mz) were made from bleached mixed hardwood pulp (predominant component: white birch), softwood pulp (predominant component: spruce), mixed hardwood and softwood pulp, and recycled pulp. In addition, sheets of Whatman filters were used. The sheets were soaked by soaking with 1-5% by weight of the following stick-enhancing formulations: (a) citric acid and CMC, (b) propionic acid and CMC, (c) tartaric acid and CMC. CMC from Sigma-Aldrich (viscosity <200cP, degree of substitution (DS) 065-10, purity 99.5%) or Dow-Wolff (viscosity 20-1000 cP, DS 0.82-0.95, purity 99%) were used. The aqueous solutions of CMA and citric acid were prepared by dissolving 30 g of CMC or pectin (Fluka, No. 76280) and the indicated amount of citric acid in 1 L of water. The soaked sheets were placed on a thin plastic sheet and heated in an oven for 1 to 40 minutes at a temperature of from 40 ° C to 120 ° C. For comparison, some samples were washed with water (rinsing with 3x1 L) and dried again as above to determine the durability of the modifications.
    The sheets were conditioned overnight at room temperature. Their strength properties were analyzed in a Testometric material testing machine. The results clearly show that the addition of the carboxylic acid catalyst to the aqueous solution improves the tensile strength index compared to an aqueous solution containing only the carboxylated polysaccharide (eg samples 1, 2 and 3 in Table 1), while the addition of only carboxylic acid does not give an increased tensile index 533 834 11 (see sample 12, Table 1). The results also show that the addition of the carboxylic acid catalyst to the aqueous solution gives a significantly improved tensile strength index after rinsing with water (eg samples 7.8 and 9 in Table 1), indicating that a significant portion of the polycarboxylated polysaccharide is bound to the fibers with strong bonds. In Table 1 Conc. Traction-. strength- Org. acid T Reaction-. firmness- P ° St me 'ferrnuiering Agem (vikipreeenija (° 0) iid (min) Wash index ïktprocent) (Nm / g) 1 Virgin - - - - - - 90.7 2 virgin 1 civic o 100 20 No 102 3 Virgin 1 civic 0.10 100 20 No 106.7 4 virgin 1 civic 0.10 100 a No 105.5 5 virgin 1 civic 0.10 40 25 No 96 Re- 6 cy - - - - - - 30 Re- 7 ey 5 civic 0 100 15. ia 25.6 e 5 civic _ 0,5 100 15 .ie 63 9 5 civic 0,20 40 15 .ia 62 10 FP - - _ _ _ - 16.7 11 FP s civic 0 100 10 Nej 37 12 FP 1 _ 1 ”100 10 No 15.4 13 FP a civic 0,5 100 10 No 41.9 14 Virgin - - - - - - 83.6 15 virgin 1 Pectin P, 10 100 20 No 84.8 16 Virgin 1 Pectin P, 10 100 20 No 90.5 a C = citric acid; P = propionic acid, Org. acid% by weight refers to the weight of the organic acid: the dry weight of carboxylated polysaccharideb refers to 10 g of citric acid in O and 1 L of water. Re-cy = recycled. FP = filter paper.
    EXAMPLE 3 Application of the formulation according to the invention by means of a laboratory coater “K202 Control Coater”. Sheets of laboratory paper, 60 g / mz, formed in a Rapid Köthen sheet former from bleached hardwood fibers and bleached softwood fibers or cardboard, 280 glmz, were used. Aqueous strength-enhancing solutions with citric acid and CMC (Sigma-Aldrich (viscosity <200cP, DS 0.654 10 20 25 533 834 12 1.0, purity 99.5%) or Dow-Wolff (viscosity 20-1000 cP, DS 0.82-0.95, purity 99%) ) was prepared by dissolving 10, 20 or 40 g of CMC and 1, 2 or 4 g of citric acid in 1 L of water and applying to the sheets using a laboratory coater. The amount of formulation applied was determined gravimetrically and ranged from 0.2% to 4% by weight of dry berries. The sheets were heated in an oven to a temperature of 105 ° C for 10 minutes. After overnight conditioning, the strength properties of the sheets were examined using a Testometric material testing machine. The results clearly indicate that the tensile strength index increases when larger amounts of the chemical formulation are applied to the sheets of laboratory paper (see, for example, samples 4-6 in Table 2).
    Table / 2 Area- Conc. strength- Apphcerad.
    Post weight form ulation. 'àaEharIJHa / Stïets' (g / mz) (weight percent emg b' n X1 m 9 (weight percent) 1 60 - - 82.5 2 60 1 1 87.3 3 60 1 2 95.7 4 60 2 1 85.1 5 60 2 2 92.1 6 60 2 3 95.0 7 280 - - 61.1 8 280 4 0.2 69.6 9 280 4 0.4 70.9 a Concentration strength-enhancing formulationf total amount of dry formulation chemicals in water (wlw). ”Applied strength-enhancing formulation: dry formulation chemicals on dry fi ber (wlw).
    EXAMPLE 4 Application of the formulation according to the invention by spray coating. Sheets of laboratory paper, 60-290 g / m 2, formed in a Rapid Köthen sheet former from chemical or chemo-thermal mechanical pulp of hardwood, softwood, recycled pulp and mixtures thereof were used. Several pulp samples included common additives in wet batch processes. The sheets were sprayed before or after pressing with 3% by weight of aqueous strength enhancing formulations in CMC (Sigma-Aldrich (viscosity <200oP, DS 0.65-1.0, purity 99.5%) or Dow-Wolff (viscosity 20-1000 cP, DS 0.82-0.95, purity 99%)) or carboxymethylated 533 834 13 starch (CMC; Emsland Starch, viscosity 200 cP, DS 0.3, purity 70-80%) containing from 0-30% by weight citric acid. The aqueous solutions with CMC or CMS and citric acid were prepared by dissolving 10 g of CMC or CMS and 0-9 g of citric acid in 1 L of water. The amount of formulation applied was determined gravimetrically and varied from 0% by weight to 26% by weight per dry. Ber. The sheets were heated in an oven at a temperature of 94 ° C for 10 minutes under reduced pressure (1 bar) or 120 ° C for one hour. After overnight conditioning, the mechanical properties of the sheets were examined using a Testometric in a material testing machine. The results clearly show that an addition of carboxylic acid to the chemical formulation results in a higher tensile strength index (see for example samples 4-6 in Table 3).
    Table 3 Formulation- Lemon- Formulation Tensile strength- Post Fiber lering 2: 2 acid / fi ber G fi a 'firmness (weight CMS (weight percent) (lmz) index percentage sens ”° 9 gNmg) 1 Virgin-ch - - - - so 79.3 2 Virgin-ch 3 CMC 10 5 60 89.9 3 Virgin -ch 3 CMC 10 10 60 91.9 4 Re-cycled - - - - 1 00 35.4 5 Re-cycled 3 CMC 0 2 100 44.4 6 Re-cycled 3 CMC 30 2 1 00 47.5 7 Re-cycled 3 CMC 0 2 1 00 39.8 8 Re-cycled 3 CMC 5 2 100 41 9 CTMP - - - so 62.5 CTMP 10 Virgmch 3 CMC 0 3 60 66.4 CTMP 11 Virginæh 3 cMc s 3 so ss CTMP 12 Virgirbch 3 CMC 10 3 60 67.5 CTMP 13 Virgimch 3 CMS 0 3 60 63.5 CTMP 14 Virgin_ch 3 _ CMS 10 3 60 64.5 CTMP 15 Virginæh 3 CMS 20 3 60 66 1s CTMP 3 cMs 30 3 so s4.3 Virgt-ch 20 25 30 533 834 14 ° Concentration strength-enhancing formulation refers to g dry CMC or CMS per 1 L of water. 'Citric acid weight percent refers to the dry weight ratio of citric acid / dry weight CMC or CMS.
    EXAMPLE 5 Application of the formulation according to the invention by gravure printing paper pilot scale. Cardboard from chemical and chemo-thermal mechanical softwood pulp And hardwood pulp was used. The paper included commonly used paper additives for wet end processes. The cardboard was surface coated with a Jagenberg Pilot Machine (500 m / min). 3% by weight aqueous chemical formulation with CMC ((Sigma-A | drich or Dow-Wolff) containing 0.3% by weight of citric acid was applied by mono-engraving methodology.The amount of formulation applied was determined by measuring the amount of formulation consumed and was about 0.2% by weight per dry fi ber. The paperboard was heated by IR irradiation and the paperboard reached a maximum temperature of 86 ° C. After overnight conditioning, the mechanical properties of the sheets were examined using a Testometric material testing machine.
    The tensile strength index increased from 81 Nm / g (unmodified board) to 84.5 Nm / g (modified board).
    EXAMPLE 6 Application of the formulation according to the invention by spray coating the pilot scale. An XPM pilot machine with pulp of chemical and chemothermic mechanical softwood and hardwood pulp was used. The pulp included additives that are often used in wet-end processes. The chemical formulation was applied in the wire section. Aqueous crosslinking formulations with 1-2% by weight CMC containing 0.1-0.2% by weight of citric acid, or 1-2% CMS containing 0.1.-0.2% by weight of citric acid were applied by spraying.
    The amount of formulation applied was determined by measuring the fl fate of the spray (0.7-3% by weight per dry fiber for CMC and 0.9-6.8% by weight for CMS).
    The paper was pressed and dried in the XPM pilot machine under 10. .20 25 30 533 834 15 .standard conditions. After overnight conditioning, the mechanical properties of the sheets were examined. The tensile strength index increased from 50 Nm / g (unmodified paper) to 61.6 Nm / g (CMC and citric acid modified paper) and 58.0N m / g (CMS and citric acid modified paper). Scott Bond increased from 180 J / mz to 334.5 J / mz (CMC and citric acid modified paper »and from 180 J / mz to 271 Jlmz (CMS and citric acid modified paper).
    EXAMPLE 7 Optimization of Reaction Parameters Reaction temperature versus time Initially, drying times were determined at different temperatures on separate sheets of paper.
    Then, dry sheets were soaked in a solution prepared by dissolving 10 g of CMC and 1 g of citric acid in 1000 g of water. The sheets of paper were placed on a thin plastic film and heated separately in an oven at different times and temperatures until the sheets were dry. The results are shown in Fig. 1. An unmodified sheet of paper has a tensile strength index of 89 Nm / g. A sheet of paper modified with CMC and without citric acid has a tensile strength index of 102 Nm / g. An optimum in the tensile strength index was observed at 80 ° C. The effect of citric acid seems to require a temperature of at least 60 ° C, since the effect at 40 ° C is similar to the results without citric acid.
    Wetting agent Wetting agent (Surfynol®) did not affect the mechanical properties in experiments with carboxymethyl starch.
    Adsorption isotherm Paper sheets 60 glmz formed in a Rapid Köthen sheet former with chemo-thermal mechanical pulp were used. After pressing, the sheets of laboratory paper were sprayed with a reinforcing formulation prepared by dissolving 30 g of CMC and 3 g of citric acid in 1000 g of water. The amount of formulation applied 533 834 16 was determined gravimetrically. The sheets of paper were dried at 90 ° C and 1 bar for 10 minutes. prior to analysis, the sheets of paper were conditioned overnight. The results are shown in Fig. 2.
    Concentration of organic acid Paper sheets (60 g / m 2) formed in a Rapid Köthen sheet former with chemo-thermal mechanical pulp were used. After pressing, the sheets of laboratory paper were sprayed with a solution of 30 g CMC in 1000 g of water containing varying amounts of citric acid. The amount of formulation applied was determined gravimetrically. The sheets of paper were dried at 90 ° C and 1 bar for 10 minutes. Prior to analysis, the sheets of paper were conditioned overnight. The results are shown in Fig. 3.
    权利要求:
    Claims (1)
    [1]
    Requirement 1. 533 834 J A method of improving a strength property of a sheet-shaped breast material formed of an aqueous slurry of cellulose, the method comprising the steps of incorporating in the wet or dry end of a pulp; a) fi providing a coating formulation consisting of; a polysaccharide having at least two carboxyl groups selected from; carboxymethylcellulose (CMC); polyuronic acid such as galacturonic acid, for example as comprised of pectin, including; polyuronic acid such as mannuronic acid and guluronic acid, for example as comprised of alginic acid; oxidatively degraded polyuronic acid, sodium carboxymethyl starch (CMS), oxidized starch, carboxymethylhemicellulose, carboxymethyllignocellulose, the carboxylated polysaccharide of the invention comprises its stoichiometric and non-stoichiometric sodium carboxyl and potassium used; and -a low molecular weight organic mono-, di- or polycarboxylic acid selected from: acetic acid, mandelic acid, citric acid, tartaric acid, aspartic acid and glutamic acid, formic acid, propanoic acid, butyric acid, valeric acid, oxalic acid, maleic acid, succinic acid, glutaric acid; or a mixture of two or fls of said organic mono-, di- or polycarboxylic acids; and - an aqueous carrier b) coating one side of the sheet-shaped fi brittle material with said coating formulation by spraying, brushing or gravure printing c) maintaining the coated surface at a temperature of 70 ° C or more for a time sufficient to achieve the desired the improvement including drying of the material. The method of claim 1, wherein time sufficient to achieve the desired improvement is the drying time. The method according to any one of the preceding claims wherein the concentration of said organic acid in the aqueous carrier is from 0.1 parts to 10. 533 834 18 parts relative to 100 parts of said polysaccharide having at least two carboxyl groups. The method according to any one of the preceding claims, wherein the strength property is selected from tensile strength (dry) (N / m), elongation (%), tear strength (Nm), stiffness (Nm), Scott-Bond (J / m2). The method of any one of the preceding claims, wherein the carboxylated polysaccharide is a polysaccharide capable of forming a sol or gel in the aqueous carrier. The method of any one of the preceding claims, wherein the aqueous carrier of the invention is water and optionally comprises small amounts of inorganic salts such as sodium chloride, antioxidants such as ascorbic acid, metal ion binding agents such as EDTA, neutral or acidic wetting agents, and the like. The method according to any one of the preceding claims, wherein the sheet-shaped fi brittle material is a paper-based material such as writing paper, gypsum-graded paper, kraft paper, cardboard, liquid cardboard, corrugated paper, fi n paper and special paper. The method according to any one of the preceding claims, wherein cellulose beads in the sheet-shaped brittle material are pulps of various kinds, in particular unbleached pulp, bleached pulp, recycled pulp, but also cotton pulp, straw pulp, hemp pulp, viscose or mixtures thereof. The process according to any one of the preceding claims, wherein the total concentration of the carboxylated polysaccharide and the organic acid in the aqueous carrier is from 0.1 to 30% by weight. The method according to any one of the preceding claims, wherein the surface coating is spray coating, the total concentration of the carboxylated polysaccharide and the organic acid in the aqueous carrier is from 1 to 5% by weight. The method of claim 10, wherein the coating primer has a viscosity of 40 cP to 5000 cP. Sheet size breast material modified by the method according to any of the preceding claims. The use of a wet or dry surface coating formulation by a paper machine by spraying, brushing or gravure printing to improve the strength properties of a sheet-shaped breast material formed from an aqueous slurry of cellulose, the coating formulation comprising; a polysaccharide having at least two carboxyl groups selected from; carboxymethyloellulose (CMC); polyuronic acid such as galacturonic acid, for example as comprised of pectin, including; polyuronic acid such as mannuronic acid and guluronic acid, for example as comprised of alginic acid; oxidatively degraded polyuronic acid, sodium carboxymethyl starch (CMS), oxidized starch, carboxymethylhemicellulose, carboxymethyllignocellulose, the carboxylated polysaccharide of the invention includes its stoichiometric and non-stoichiometric sodium and potassium; and -a low molecular weight organic mono-, di- or polycarboxylic acid selected from: acetic acid, mandelic acid, citric acid, tartaric acid, aspartic acid and glutamic acid, formic acid, propanoic acid, butyric acid, valeric acid, oxalic acid, maleic acid, succinic acid, glutaric acid; and an aqueous carrier. The use according to claim 13 for improving the dry strength properties of a sheet-shaped fibrous material. The use according to claims 13 or 14, wherein the concentration of said organic acid in the aqueous carrier is from 0.1 parts to 30 parts relative to 100 parts of said polysaccharide having at least two carboxyl groups. The use according to any one of claims 13 to 15, wherein the coated surface is heated at a temperature of 70 ° C or more for a time sufficient to achieve the desired improvement including drying of the material 17. The use according to any one. of claims 13-16, wherein the strength property is selected from tensile strength (dry) (N / m), elongation (%), tear strength (Nm), stiffness (Nm), Scott-Bond (J / m2).
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    同族专利:
    公开号 | 公开日
    US8568564B2|2013-10-29|
    WO2009121926A1|2009-10-08|
    CA2719165C|2013-10-22|
    US20110114276A1|2011-05-19|
    EP2108676A1|2009-10-14|
    EP2260082A1|2010-12-15|
    SE0950214L|2009-10-04|
    EP2108676B1|2017-12-27|
    CA2719165A1|2009-10-08|
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    法律状态:
    优先权:
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    EP08154011.4A|EP2108676B1|2008-04-03|2008-04-03|Crosslinked paper based material|
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