Air-drying coating compositions
First Claim
1. An air-drying coating composition hardenable by UV-light comprising the product of reaction, at a temperature of 20°
- to 90°
C. and in the presence of 0.001 to 0.1% by weight, based on the total compositions, of a polymerization inhibitor, of a polyepoxide with 0.01 to 0.5 NH-equivalents, based on the epoxide equivalent, of at least one nitrogen compound selected from the group consisting of ammonia, and aliphatic and cycloaliphatic primary and secondary amines, which intermediate product has subsequently been reacted with 0.99 to 0.5 carboxyl equivalents, based on one epoxide equivalent, of at least one member selected from the group consisting of acrylic acid and methacrylic acid, at least 60% of the epoxide groups of said polyepoxide having been so reacted.
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Abstract
Air-drying unsaturated coating compositions are obtained by reacting at least 60% of the epoxide groups of a polyepoxid with more than one epoxid group per molecule
(a) with 0.01 to 0.5 NH-equivalents, based on one epoxide group of ammonia, an aliphatic or cycloaliphatic primary or secondary amine and subsequently
(b) with 0.99 to 0.5 carboxyl equivalents, based on one epoxide group of acrylic or methacrylic acid.
The reaction products may be mixed with solvents and/or copolymerizable monomers and are preferably hardened in the presence of known photoinitiators with the aid of energy radiation.
Their particular advantages are their stability in the dark and that they also harden very quickly in the presence of atmospheric oxygen.
Preferred substrates are paper and cardboards.
26 Citations
13 Claims
-
1. An air-drying coating composition hardenable by UV-light comprising the product of reaction, at a temperature of 20°
- to 90°
C. and in the presence of 0.001 to 0.1% by weight, based on the total compositions, of a polymerization inhibitor, of a polyepoxide with 0.01 to 0.5 NH-equivalents, based on the epoxide equivalent, of at least one nitrogen compound selected from the group consisting of ammonia, and aliphatic and cycloaliphatic primary and secondary amines, which intermediate product has subsequently been reacted with 0.99 to 0.5 carboxyl equivalents, based on one epoxide equivalent, of at least one member selected from the group consisting of acrylic acid and methacrylic acid, at least 60% of the epoxide groups of said polyepoxide having been so reacted. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- to 90°
-
8. An ultraviolet curable acrylate resin composition consisting essentially of a reaction product of (i) a secondary monoamine selected from the group consisting of dimethylamine, diethylamine, methylethylamine, diisopropylamine, piperidine, methylcyclohexyl amine, methylethanolamine, phenylethanolamine and diisopropanolamine, (ii) acrylic acid and (iii) a polyepoxide in a ratio of 0.01 to 0.5 chemical equivalents of the monoamine per chemical equivalent of the polyepoxide and 0.99 to 0.5 chemical equivalents of the acrylic acid per chemical equivalent of the polyepoxide wherein said polyepoxide is a glycidyl ether of 2,2-bis(4-hydroxyphenyl) propane and wherein said reaction product is prepared by contacting components (i), (ii) and (iii) at reaction temperatures of 20°
- C. to 90°
C. - View Dependent Claims (9, 10)
- C. to 90°
-
11. The method of preparing an ultraviolet curable acrylate resin composition which comprises contacting in a reactor at a temperature of 20°
- C. to 90°
C. and in the absence of additional catalysts (i) a secondary monoamine selected from the group consisting of dimethylamine, diethylamine, methylethylamine, diisopropylamine, piperidine, methylcyclohexyl amine, methylethanolamine, phenylethanolamine and diisopropanolamine, (ii) acrylic acid and (iii) a polyepoxide in a ratio of 0.01 to 0.5 chemical equivalents of the monoamine per chemical equivalent of the polyepoxide and 0.99 to 0.5 chemical equivalents of the acrylic acid per chemical equivalent of the polyepoxide wherein said polyepoxide is a glycidyl ether of 2,2-bis(4-hydroxyphenyl)propane and wherein said polyepoxide is contacted first with said secondary monoamine and then with said acrylic acid. - View Dependent Claims (12, 13)
- C. to 90°
Specification