Solventless, ultraviolet radiation-curable silicone coating compositions
First Claim
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1. A solventless ultraviolet radiation-curable coating composition free of hydroxy acrylates comprising:
- (A) 100 parts by weight silica in the form of a colloidal dispersion;
(B) 5 to 500 parts by weight of an acid hydrolysis product of(i) an acryloxy-functional silane having a general formula;
##STR9## wherein R3 and R4 are the same or different monovalent hydrocarbon radicals, R5 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, R6 is hydrogen or a monovalent hydrocarbon radical, b is an integer from 1 to 3, c is an integer from 0 to 2, and d is an integer equaling 4-b-c;
or(ii) a glycidoxy-functional silane having a general formula;
##STR10## wherein R7 and R8 are the same or different monovalent hydrocarbon radicals, R9 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, e is an integer from 1 to 3, f is an integer from 0 to 2, and g is an integer equaling 4-e-f;
or(iii) a mixture of (i) and (ii); and
(C) a catalytic amount of an ultraviolet light sensitive photoinitiator or mixture of photoinitiators;
wherein residual solvent has been removed from said coating composition at reduced pressure.
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Abstract
An ultraviolet radiation-curable silicone coating composition is disclosed which, when applied to a solid substrate, provides an abrasion-resistant coating firmly adhered thereon. The silicone coating composition is free of residual solvent and free of toxic hydroxy acrylates, and is prepared from the hydrolysis products of acryloxy-functional silanes and/or glycidoxy-functional silanes, colloidal silica and a photoinitiator.
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Citations
30 Claims
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1. A solventless ultraviolet radiation-curable coating composition free of hydroxy acrylates comprising:
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(A) 100 parts by weight silica in the form of a colloidal dispersion; (B) 5 to 500 parts by weight of an acid hydrolysis product of (i) an acryloxy-functional silane having a general formula;
##STR9## wherein R3 and R4 are the same or different monovalent hydrocarbon radicals, R5 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, R6 is hydrogen or a monovalent hydrocarbon radical, b is an integer from 1 to 3, c is an integer from 0 to 2, and d is an integer equaling 4-b-c;
or(ii) a glycidoxy-functional silane having a general formula;
##STR10## wherein R7 and R8 are the same or different monovalent hydrocarbon radicals, R9 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, e is an integer from 1 to 3, f is an integer from 0 to 2, and g is an integer equaling 4-e-f;
or(iii) a mixture of (i) and (ii); and (C) a catalytic amount of an ultraviolet light sensitive photoinitiator or mixture of photoinitiators;
wherein residual solvent has been removed from said coating composition at reduced pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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13. A process for preparing a solventless ultraviolet radiation curable coating composition free of hydroxy acrylates comprising:
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(1) Combining (A) 100 parts by weight silica in the form of a colloidal dispersion; (B) 5 to 500 parts by weight of the acid hydrolysis product of (i) an acryloxy-functional silane of the formula;
##STR13## wherein R3 and R4 are the same or different monovalent hydrocarbon radicals, R5 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, R6 is hydrogen or a monovalent hydrocarbon radical, b is an integer from 1 to 3, c is an integer from 0 to 2, and d is an integer equal to 4-b-c;
or(ii) a glycydoxy-functional silane of the formula;
##STR14## wherein R7 and R8 are the same or different monovalent hydrocarbon radicals, R9 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, e is an integer from 1 to 3, f is an integer from 0 to 2, and g is an integer equal to 4-e-f;
or(iii) mixtures of (i) and (ii); (2) adding a catalytic amount of an ultraviolet light sensitive photoinitiator; and
thereafter(3) removing residual solvent at reduced pressure. - View Dependent Claims (14, 15, 16, 17)
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Specification