Radiation-curable thermoplastic coating
First Claim
1. A coating composition comprising a curable blend of(a) 20 to 80 weight percent of an ethylenically unsaturated polyester comprising the condensation or addition product of a polyhydroxy polyester comprising the reaction product of at least one organic diepoxide, and at least one saturated or unsaturated dicarboxylic acid, and an effective amount of polymerizable ethylenically unsaturated compound having sufficient reactive functional groups with the hydroxyl groups of said polyhydroxy polyester oligomer to provide to the ethylenically unsaturated polyester an ethylenic unsaturation equivalent weight of less than about 500, and(b) 20 to 80 weight percent of ethylenically unsaturated thermoplastic polymers selected from ethylenically unsaturated cellulose esters, ethylenically unsaturated polyvinyl acetate copolymers, ethylenically unsaturated acrylic copolymers, or ethylenically unsaturated azlactone copolymers,said composition capable of providing a thermoplastic, soluble, sandable, intermediate-stage coating and a final stage coating which is unaffected by acetone placed on the final stage coating for 30 minutes at 22°
- C., which final stage coating has a percent haze value of 15% or less, and which final stage coating is unaffected when subjected to a Wet Print Test.
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Abstract
A coating composition is provided. The coating composition is a curable blend of ethylenically unsaturated polyester and ethylenically unsaturated thermoplastic polymers. The composition is capable of providing a thermoplastic, soluble, sandable, intermediate-stage coating and, when cured, a final stage coating which is unaffected by acetone placed on the final stage coating for two hours at 22° C., has a percent haze value of 15% or less, and is unaffected when subjected to a Wet Print Test.
115 Citations
15 Claims
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1. A coating composition comprising a curable blend of
(a) 20 to 80 weight percent of an ethylenically unsaturated polyester comprising the condensation or addition product of a polyhydroxy polyester comprising the reaction product of at least one organic diepoxide, and at least one saturated or unsaturated dicarboxylic acid, and an effective amount of polymerizable ethylenically unsaturated compound having sufficient reactive functional groups with the hydroxyl groups of said polyhydroxy polyester oligomer to provide to the ethylenically unsaturated polyester an ethylenic unsaturation equivalent weight of less than about 500, and (b) 20 to 80 weight percent of ethylenically unsaturated thermoplastic polymers selected from ethylenically unsaturated cellulose esters, ethylenically unsaturated polyvinyl acetate copolymers, ethylenically unsaturated acrylic copolymers, or ethylenically unsaturated azlactone copolymers, said composition capable of providing a thermoplastic, soluble, sandable, intermediate-stage coating and a final stage coating which is unaffected by acetone placed on the final stage coating for 30 minutes at 22° - C., which final stage coating has a percent haze value of 15% or less, and which final stage coating is unaffected when subjected to a Wet Print Test.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A coating composition comprising a blend of (a) 20 to 80 weight percent of ethylenically unsaturated polyester which is the condensation or addition product of a polyhydroxy polyester comprising the reaction product of at least one organic diepoxide, and at least one saturated or unsaturated dicarboxylic acid, and an effective amount of polymerizable ethylenically unsaturated compound having sufficient reactive functional groups with the hydroxyl groups of said polyhydroxy polyester oligomer to provide to the ethylenically unsaturated polyester an ethylenic unsaturation equivalent weight of less than about 500, and (b) 20 to 80 weight percent of an ethylenically unsaturated thermoplastic cellulose ester which is the condensation or addition product of a cellulose ester of cellulose and saturated aliphatic monocarboxylic acids having 2 to 4 carbon atoms or aromatic monocarboxylic acids, said cellulose ester having an average of 0.1 to 2.0 unreacted hydroxyl groups per anhydroglucose unit and a chemically effective amount of polymerizable ethylenically unsaturated compound having sufficient reactive functionality with the hydroxyl groups of said cellulose ester, to yield an ethylenically unsaturated cellulose ester wherein up to 100% of the unreacted hydroxyl groups have been converted to polymerizable unsaturated groups.
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14. A coating composition comprising a blend of (a) 20 to 80 weight percent of an ethylenically unsaturated polyester which is the addition product of (i) a polyhydroxyl polyester comprising the reaction product of the diglycidyl ether of Bisphenol A, itaconic acid, and acrylic acid, the molar ratio being 1.0/0.5/1.0, respectively, and (ii) isocyanatoethyl methacrylate and (b) 20 to 80 weight percent of an ethylenically unsaturated thermoplastic polymer which is the addition product of cellulose acetate propionate and isocyanatoethyl methacrylate.
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15. A coating composition comprising a curable blend of
(a) 20 to 80 weight percent of an ethylenically unsaturated polyester comprising the condensation or addition product of a polyhydroxy polyester comprising the reaction product of at least one organic diepoxide, and at least one saturated or unsaturated dicarboxylic acid, and an effective amount of polymerizable ethylenically unsaturated compound having sufficient reactive functional groups with the hydroxyl groups of said polyhydroxy polyester oligomer to provide to the ethylenically unsaturated polyester an ethylenic unsaturation equivalent weight of less than about 500, and (b) 20 to 80 weight percent of an ethylenically unsaturated cellulose ester comprising the reaction product of a cellulose ester of cellulose and saturated aliphatic monocarboxylic acids having 2 to 4 carbon atoms or aromatic monocarboxylic acids, said cellulose ester having an average of about 0.1 to 2.0 unreacted hydroxyl groups per anhydroglucose unit, and a polymerizable ethylenically unsaturated compound having an isocyanato group reactive with the hydroxyl groups of the cellulose ester, said composition capable of providing a thermoplastic, soluble, sandable, intermediate-stage coating and a final stage coating which is unaffected by acetone placed on the final stage coating for 30 minutes at 22° - C., which final stage coating has a percent haze value of 15% or less, and which final stage coating is unaffected when subjected to a Wet Print Test.
Specification