Curing Powder Surface Coating Composition

专利摘要:
Disclosed is a powder coating composition comprising at least one carboxyl functional polymer and at least one crosslinker, wherein said crosslinker is a glycidyl ether of a a 2,4,8, 10-tetraoxaspiro[5.5]undecane-3,9-dialkanol, most preferably 2,4,8, 10-tetraoxaspiro- [5.5]undecane-3,9-diethanol (pentaerythritol spiroglycol) mono or diglycidyl ether.
公开号:SE1200397A1
申请号:SE1200397
申请日:2012-06-29
公开日:2013-12-30
发明作者:Kent Soerensen；David James
申请人:Perstorp Ab；
IPC主号:

专利说明:

β-hydroxyalkylamides. A problem with β-hydroxyalkylamides is that, when the crosslinking mechanism is a condensation reaction, water is formed. This water formation can result in surface defects. Glycidyl carboxylates, such as glycidyl esters of aromatic acids, are often surfactants and as such can give rise to storage problems.
It has now been unexpectedly established that glycidyl ethers of pentaerythritol spiroglycol are excellent substitutes for TGIC. Accordingly, the present invention relates to a powder coating composition comprising at least one carboxyl-functional polymer, such as an unsaturated or preferably saturated carboxyl-functional polyester, and at least one pentaerythritol spiroglycol glycidyl ether of formula I (IÉH: oo | CH 3 Ho-CH 2 -o- <> <> - -hH CH 2 O CH, Said glycidyl ether is a solid crystalline compound having a melting point suitable for powder coating compositions and is suitably present in an amount of 5-15% by weight, such as 8-12% by weight, based on said carboxyl-functional polymer.
The most preferred embodiment of said glycidyl ether is a diglycidyl ether according to formula II (IÉH: O O 1 HHs CH -O-CH --C- In embodiments of the present invention, said powder coating composition may comprise at least one additional crosslinker, for example a glycidyl ester or a glycidyl ether, such as di- and triglycidyl carboxylate of aromatic di- or trifunctional acids, for example triglycyl tylcidyl diglycyl , diglycidyl p-hydroxybenzoate, triglycidyl isocyanaurate, and / or a β-hydroxyalkylamide, or in addition dibasic aliphatic carboxylic acids such as fumaric acid, succinic acid, adipic acid, azelaic acid, sebic acid, dodecanedicarboxylic acid anhydride and similar, or acrylic resins, dicyandiamide and derivatives thereof, imidazole and derivatives thereof, amino compounds such as diaminophenylmethane, cycloamidine compounds, externally blocked isocyanates such as caprolactam or methyl ketoxime blocked isophorone diisocyanate trimer (IPDI), internal block isocyanates, such as urethdiones, and the like. Said additional crosslinker is preferably a solid compound at room temperature.
The powder coating composition of the present invention suitably and preferably comprises at least one phase transfer catalyst, such as an alkyltriphenylphosphonium halide exemplified with ethyltriphenylphosphonium bromide, at least one surfactant, leveling and / or degassing agent intended for powder coating and / or other additives and / or other additives and / or other additives.
A carboxyl-functional polyester can be prepared by selecting the ratio of alcohols to acids or anhydrides in such a way that there is an excess of carboxylic acid or anhydride relative to alcohol, yielding a polyester having terminal carboxylic acid or anhydride groups. A carboxyl-functional polyester used in the present invention preferably has an acid number of at least 15, such as 30-60 or 60-120, mg KOH / g. Said carboxyl-functional polyester is suitably prepared from difunctional alcohols; dicarboxylic acids and branching monomers, such as at least trifunctional alcohols and / or carboxylic acids. It is apparent to one skilled in the art that other resins, in addition to said polyester, may also be present in the curing powder coating composition of the present invention.
Experiment Powder coatings comprising below amounts (parts by weight) were prepared and evaluated.
Comparison Embodiment Uralac® P-3486 * 1,279.57 266.94 Afa1an® PT 910 * z 40.43 PSG-DE * 3 ---- 33.06 Titanium dioxide 90.00 90.00 Resi fl0 w® * 4 3.00 3.00 Benzoin 0.75 0.75 Ethyltriphenylphosphonium bromide 4.50 4.50 * l Saturated carboxyl-functional polyester - DSM * 2 Mixed glycidyl carboxylates of aromatic acids - Huntsman * 3 Pentaerythritol spiroglycol diglycidyl ether - Perstorp Specialty Chemicals - Preparations and Preparations for 10 minutes and extruded at 300 rpm with the temperature zones, cold, cold, 90 ° C and 10 ° C. The resulting extrudate was ground for 3 minutes at 20,000 rpm and sieved in an 80 μm sieve and then applied with an electrostatic powder spray gun to Q steel panels. Curing took place at 180 ° C for 15 minutes followed by conditioning at 25 ° C and 50% relative humidity.
The following results were obtained at a film thickness of 50-60 μm: Comparison Embodiment Reverse indentation, inch-lbs <10 <10 Gloss, 60 ° 70 96 MEK rubs 120 1 15

权利要求:
Claims (1)
[1]
1. A powder coating composition comprising at least one carboxyl-functional polymer and at least one crosslinker characterized in that said crosslinker is a pentaerythritol spiroglycol glycidyl ether. Powder coating composition according to claim 1, characterized in that said glycidyl ether is a diglycidyl ether. Powder coating composition according to claim 1 or 2, characterized in that said pentaerythritol spiroglycol glycidyl ether is present in an amount of 5-15% by weight, such as 8-12% by weight, based on said carboxyl-functional polymer. Powder coating composition according to any one of claims 1-3, characterized in that said composition comprises at least one additional crosslinker. Powder coating composition according to claim 4, characterized in that said additional crosslinker is a glycidyl ester, a glycidyl ether and / or a β-hydroxyalkylamide. Powder coating composition according to claim 4, characterized in that said additional crosslinker is a di- or triglycidyl carboxylate of an aromatic di- or trifunctional acid. Powder coating composition according to claim 4, characterized in that said additional crosslinker is triglycidyl trimellitate and / or triglycidyl isocyanurate. Powder coating composition according to any one of claims 1-7, characterized in that said carboxyl-functional polymer is a saturated or unsaturated carboxyl-functional polyester. Powder coating composition according to any one of claims 1-8, characterized in that said composition further comprises at least one phase transfer catalyst. Powder coating composition according to claim 9, characterized in that said phase transfer catalyst is at least one alkyltriphenylphosphonium halide, such as ethyltriphenylphosphonium bromide. Powder coating composition according to any one of claims 1-10, characterized in that said composition further comprises at least one leveling, leveling and / or degassing agent intended for powder surface coatings and / or at least one pigment.

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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SE1200397A|SE536610C2|2012-06-29|2012-06-29|Curing powder surface coating composition|SE1200397A| SE536610C2|2012-06-29|2012-06-29|Curing powder surface coating composition|

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PCT/SE2013/000094| WO2014003624A1|2012-06-29|2013-06-05|A thermoset powder coating composition|

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EP13810258.7A| EP2867313B1|2012-06-29|2013-06-05|A thermoset powder coating composition|

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TW102122340A| TWI475082B|2012-06-29|2013-06-24|A thermoset powder coating composition|