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US 4,156,046 AGranted
Ultraviolet radiation protective, abrasion resistant, bloom resistant coatings
AssigneeMinnesota Mining and Manufacturing Company
InventorsLarry A. Lien, Ashwani K. Mehta, Kathryn A. Soine, J. Lamar Zollinger
Life of this patent
Estimating the term…
Abstract
Abrasion resistant coatings based on epoxy-terminated silanes can reduce the transmission of ultraviolet radiation by at least 90% with the addition of ultraviolet radiation absorbers and 10-70% by weight of an aliphatic, polyepoxide, comonomer.
Claims35
An ultraviolet radiation absorbing, bloom resistant abrasion resistant film of between 0.5 and 50 microns comprising the reaction product of:
- (1) 30-90% by weight of reactive ingredients of an epoxy-terminated silane,
- (2) 10-70% by weight of reactive ingredients of an aliphatic polyepoxide having a molecular weight of at least 100 per epoxy group,
- (3) 0-20% by weight of reactive ingredients of a comonomer polymerizable with epoxy or silane groups, and
- (4) an ultraviolet absorbtive material present in sufficient amount so that the film absorbs at least 90% of all radiation between 290 and 400 nm, and is transmissive of at least 90% of all radiation between 400 and 780 nm, with no less than 75% transmissivity over any 50 nm range between 400 and 780 nm.
1 more element
A polymerizable composition comprising
- (1) 30-90% by weight of an epoxy-terminated silane,
- (2) 10-70% by weight of a polyepoxy resin of the formula ##STR28## wherein R is an aliphatic or cycloaliphatic group, n is the valence of R and is an integer of 2 to 6, a and b are H or, when fused together, represent the atoms necessary to form a 5- or 6-membered cycloaliphatic ring, wherein said epoxy resin, upon homopolymerization provides a polymer having a glass transition temperature below +25.degree. C., and wherein said epoxy resin has a molecular weight of at least 100 per epoxy group,
- and sufficient ultraviolet radiation absorber to absorb at least 90% of all radiation between 290 and 400 nm through a wet film thickness of 20.mu..
Dependencies are inferred from the claim text.