Radiation curing of prepolymer coating compositions
First Claim
1. A method of producing a durable coating on the surface of a solid comprising the steps of:
- modifying a polyamide containing primary and/or secondary amine groups, (internally and/or terminally) with unsaturated esters, anhydrides, and/or acids in ratios from 2;
1 to 10;
1 (unsaturated ester, acid or anhydride;
polyamide) thereby obtaining an unsaturated prepolymer which will copolymerize with acrylic and/or methacrylic monomers,mixing with said prepolymer, as so modified, a quantity of acrylic and/or methacrylic monomer ester material, vinyl acetate, and/or vinyl pyrolidone, in proportion between about 1;
1 and 1;
20 (modified prepolymer to monomer ester);
coating said mixture on the surface of a sheet, plate or other solid body, andirradiating said coating, as sensitized, with actinic radiation or, as unsensitized, with an electron beam, to produce a cured film.
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Abstract
Release coatings are provided by including in a liquid monomer or prepolymer polymerizable by electromagnetic or ionizing radiation a waxy material of limited compatibility therein. Upon application of a film of such material by casting, coating or printing, a thin layer of the waxy material migrates to the surface to provide, after cure, the desired release properties. The thin surface layer of waxy material also tends to exclude oxygen from the film to permit radiant curing in air. Preferably the polymerizable liquid comprises acrylate monomers with or without unsaturated prepolymers co-polymerizable therewith dissolved therein. Novel prepolymers especially useful for providing release films and other radiation curable coatings are described, including the reaction product of polyamides, containing primary and secondary amine groups with unsaturated polybasic carboxylic acids and particular reaction products of polyether triols with toluene diisocyanate, modified with unsaturated monomers. Also described is the inclusion in the polymerizable liquid of a dispersed substantially linear polymer as shrink control and re-inforcing agent.
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Citations
13 Claims
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1. A method of producing a durable coating on the surface of a solid comprising the steps of:
-
modifying a polyamide containing primary and/or secondary amine groups, (internally and/or terminally) with unsaturated esters, anhydrides, and/or acids in ratios from 2;
1 to 10;
1 (unsaturated ester, acid or anhydride;
polyamide) thereby obtaining an unsaturated prepolymer which will copolymerize with acrylic and/or methacrylic monomers,mixing with said prepolymer, as so modified, a quantity of acrylic and/or methacrylic monomer ester material, vinyl acetate, and/or vinyl pyrolidone, in proportion between about 1;
1 and 1;
20 (modified prepolymer to monomer ester);coating said mixture on the surface of a sheet, plate or other solid body, and irradiating said coating, as sensitized, with actinic radiation or, as unsensitized, with an electron beam, to produce a cured film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification