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US 4,348,462 AGranted
Abrasion resistant ultraviolet light curable hard coating compositions
AssigneeGeneral Electric Company
InventorRack H. Chung
Life of this patent
Estimating the term…
Abstract
A radiation curable coating composition comprising (A) colloidal silica (B) acryloxy or glycidoxy functional silanes (C) non-silyl acrylates and (D) catalylic amounts of UV light sensitive cationic and radical type photoinitiators is provided, which cures to a transparent hard coating exhibiting improved abrasion resistance.
Claims23
A radiation curable coating composition having improved abrasion resistance, comprising:
- (A) 100 parts by weight silica provided as colloidal silica;
- (B) 5 to 500 parts by weight of an acid hydrolysis product of a compound selected from acryloxy-functional silanes having a general formula:
- ##STR3## wherein R.sup.3 and R.sup.4 are the same or different monovalent hydrocarbon radicals, R.sup.5 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, R.sup.6 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 glycidoxy-functional silanes having a general formula:
- ##STR4## wherein R.sup.7 and R.sup.8 are the same or different monovalent hydrocarbon radicals, R.sup.9 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 a integer equaling 4-e-f, and mixtures thereof;
- (C) 10 to 500 parts of a non-silyl acrylate;
- and
- (D) a catalytic amount of ultraviolet light sensitive photoinitiator.
5 more elements
A process for improving the abrasion resistance of a substrate with a radiation curable coating composition comprising the steps of combining:
- (A) 100 parts by weight silica provided as colloidal silica;
- (B) 5 to 500 parts by weight of an acid hydrolysis product of a compound selected from acryloxy-functional silanes having a general formula:
- ##STR5## wherein R.sup.3 and R.sup.4 are the same or different monovalent hydrocarbon radicals, R.sup.5 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, R.sup.6 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 glycydoxy-functional silanes having a general formula:
- ##STR6## wherein R.sup.7 and R.sup.8 are the same or different monovalent hydrocarbon radicals, R.sup.9 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, and mixtures thereof;
- (C) 10 to 500 parts of a non-silyl acrylate;
- (D) a catalytic amount of ultraviolet light sensitive photoinitiator;
- coating said radiation curable coating composition upon said substrate;
- and
- curing said coating composition upon said substrate with an amount of radiation effective for forming an improved abrasion resistant coating upon said substrate.
7 more elements
Dependencies are inferred from the claim text.