Method for treating a substrate with a radiation and chemically curable coating composition
First Claim
1. A method for treating a substrate with a radiation curable coating composition based on a polyester resin esterified with acrylic acid and/or methacrylic acid, a vinyl compound and a photoinitiator, the coating composition being dried under the influence of light having a wave length of 200 to 600 nm, characterized in that the polyester resin esterified with meth(acrylic) acid has a hydroxyl number in the range of 50 to 250 and an ethylenic unsaturation equivalent weight in the range of 200 to 10,000 grams, and in that the coating composition also contains a polyisocyanate in an amount of 0.7 to 1.3 equivalents of isocyanate per equivalent of hydroxyl contained in the composition.
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Abstract
A method is provided for treating a substrate with a radiation curable coating composition based on a polyester resin esterified with acrylic acid or methacrylic acid and having a hydroxyl number in the range of from 50 to 250 and an ethylenic unsaturation equivalent weight of from 200 to 10,000 grams and on a polyisocyanate that is present in an amount of 0.7 to 1.3 equivalents of isocyanate per equivalent of hydroxyl contained in the composition. The curing of the coating composition is effected in a first stage by subjecting the composition to radiation having a wave length of 200 to 600 nm and in a second stage by reaction between the isocyanate groups of the polyisocyanate and the hydroxyl groups of the polyester resin.
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Citations
7 Claims
- 1. A method for treating a substrate with a radiation curable coating composition based on a polyester resin esterified with acrylic acid and/or methacrylic acid, a vinyl compound and a photoinitiator, the coating composition being dried under the influence of light having a wave length of 200 to 600 nm, characterized in that the polyester resin esterified with meth(acrylic) acid has a hydroxyl number in the range of 50 to 250 and an ethylenic unsaturation equivalent weight in the range of 200 to 10,000 grams, and in that the coating composition also contains a polyisocyanate in an amount of 0.7 to 1.3 equivalents of isocyanate per equivalent of hydroxyl contained in the composition.
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7. A method for treating a substrate with a radiation-curable coating composition comprising
applying to said substrate a coating composition comprising (1) a polyester resin esterified with acrylic acid and/or methacrylic acid and having an hydroxyl number in the range of 50 to 250 and an ethylenic unsaturation equivalent weight in the range of 200 to 10,000 grams, (2) a polyisocyanate present in an amount of about 0.7 to about 1.3 equivalents of isocyanate per equivalent of hydroxyl contained in said composition, (3) a vinyl compound, and (4) a photoinitiator, initially curing the applied coating composition under the influence of light having a wave length of 200 to 600 nm, and completing the curing by reacting the isocyanate groups of said polyisocyanate with the hydroxyl groups of said polyester resin.
Specification