White photopolymerizable epoxide compositions

Claim 2

A white photopolymerizable coating composition comprising (1) a blend of liquid epoxide materials polymerizable to higher molecular weights through the action of a cationic catalyst comprising an epoxidic ester having two epoxycycloalkyl groups, said ester constituting at least about 15% of the weight of the epoxide materials in the blend; (2) an aluminum oxide coated titanium dioxide pigment in an amount effective to color the composition to about 50% by weight of the composition and (3) as a radiation-sensitive catalyst effective to initiate polymerization of said epoxide materials upon exposure to irradiation, 2,5-diethoxy-4-(p-tolylthio) benzene diazonium hexafluorophosphate.

Claim 3

A white photopolymerizable coating composition as claimed in claim 1, in which said pigment is rutile titanium dioxide coated with from about 1 to about 10% alumina, based on the weight of the titanium dioxide.

Claim 4

A white photopolymerizable coating composition as claimed in claim 2, in which said pigment is present in an amount of about 35% to 40% by weight.

Claim 5

A white photopolymerizable coating composition as claimed in claim 3, in which said epoxide materials include at least one epoxidic prepolymer material having an epoxy equivalent weight below about 200.

Claim 6

A white photopolymerizable coating composition as claimed in claim 4 wherein said epoxidic prepolymer constitutes between about 10% and 85% by weight of the epoxide materials in the composition and is selected from the group consisting of A. an epoxy resin prepolymer consisting predominantly of the monomeric diglycidyl ether of bisphenol A B. a polyepoxidized phenol novolak or cresol novolak C. a polyglycidyl ether of a polyhydric alcohol and D. a diepoxide of a cycloalkyl or alkyl cycloalkyl hydrocarbon or ether.

Claim 7

A white photopolymerizable coating composition as claimed in claim 5, in which from about 0.25% to about 3.0% by weight of a flow control agent is present.

Claim 8

A white photopolymerizable coating composition as claimed in claim 3 in which said epoxidic material includes a monoepoxide.

Claim 9

A white photopolymerizable coating composition comprising: (1) a blend of liquid epoxide materials consisting essentially of: at least one epoxidic prepolymer material having an epoxy equivalent weight below 200 and constituting between about 10% and about 85% of the weight of the epoxidic materials in the composition and an epoxidic ester having two epoxycycloalkyl groups and constituting at least about 15% of the weight of the epoxidic materials; (2) from about 35% to about 40% of a rutile titanium dioxide pigment having from about 1% to about 10% by weight of alumina coated on its surfaces and (3) as a radiation-sensitive catalyst effective to initiate polymerization of said epoxide materials upon exposure to irradiation, 2,5-diethoxy-4-(p-tolylthio) benzene diazonium hexafluorophosphate.

Claim 10

A white photopolymerizable coating composition comprising: (1) a blend of liquid epoxide materials consisting essentially of: at least one epoxidic prepolymer material having an epoxy equivalent weight below 200 and constituting between about 10% and about 85% of the weight of the epoxidic materials in the composition and an epoxidic ester having two epoxycycloalkyl groups and constituting at least about 15% of the weight of the epoxidic materials; (2) from about 35% to about 40% of a rutile titanium dioxide pigment having from about 1% to about 10% by weight of alumina coated on its surfaces and (3) as a radiation-sensitive catalyst effective to initiate polymerization of said epoxide materials upon exposure to irradiation, 2,5-diethoxy-4-(p-tolylthio) benzene diazonium hexafluorophosphate.

Claim 11

A white photopolymerizable coating composition as claimed in claim 8, in which the epoxide blend comprises a diglycidyl ether of bisphenol A, 1,4-butanediol diglycidyl ether and 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.

Claim 12

A white photopolymerizable coating composition as claimed in claim 9 in which said epoxide blend also includes a monoepoxide.

Claim 13

A white photopolymerizable coating composition comprising: (1) a blend of liquid epoxides materials consisting essentially of: at least one monoepoxide and an epoxidic ester having two epoxycycloalkyl groups and constituting at least about 15% of the weight of the epoxidic materials; (2) from about 35% to about 40% of a rutile titanium dioxide pigment having from about 1% to about 10% by weight of alumina coated on its surfaces and (3) as a radiation-sensitive catalyst effective to initiate polymerization of said epoxide materials upon exposure to irradiation, 3,5-diethoxy-4-(p-tolylthio) benzene diazonium hexafluorophosphate.

Claim 14

A white photopolymerizable coating composition comprising: (1) a blend of liquid epoxides materials consisting essentially of: at least one monoepoxide and an epoxidic ester having two epoxycycloalkyl groups and constituting at least about 15% of the weight of the epoxidic materials; (2) from about 35% to about 40% of a rutile titanium dioxide pigment having from about 1% to about 10% by weight of alumina coated on its surfaces and (3) as a radiation-sensitive catalyst effective to initiate polymerization of said epoxide materials upon exposure to irradiation, 3,5-diethoxy-4-(p-tolylthio) benzene diazonium hexafluorophosphate.

Claim 15

A white photopolymerizable coating composition as claimed in claim 11, in which said blend comprises butyl glycidyl ether and 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.

Claim 16

A white photopolymerizable coating composition as claimed in claim 12, in which from about 0.25% to about 3% by weight of a flow control agent is present.

Claim 17

A white photopolymerizable coating composition as claimed in claim 13, in which the flow control agent is a polyvinylbutyral resin.