White photopolymerizable epoxide compositions
AssigneeAmerican Can Company
InventorWesley Albion Tarwid
Life of this patent
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Abstract
White pigmented, liquid, substantially solvent-free coating compositions are provided which may be rapidly cured to a solid, tightly adherent, opaque white coating upon exposure to radiation and particularly to electromagnetic radiation. More specifically, the compositions comprise epoxy monomers or prepolymers blended with a bis (epoxycycloalkyl)ester, a radiation-sensitive catalyst precursor effective to initiate polymerization of the epoxides upon exposure to radiation and certain alumina treated titanium dioxides, preferably of the rutile type.
Claims14
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.
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.
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.
Dependencies are inferred from the claim text.