Polyester film having abrasion resistant radiation curable silicone coating
AssigneeAmerican Hoechst Corporation
InventorVirginia R. Cross
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a clear, flexible, coated, biaxially oriented polyester film comprising a polyester film support and a radiation curable silicone coating on at least a portion of the support. The radiation curable silicone coating is derived from a dispersion of colloidal silica in an alcohol-water solution of the partial condensate of specified silanols and multifunctional acrylate monomers and oligomers with optional photoinitiators.
Claims19
A clear, flexible, coated, biaxially oriented polyester film comprising:
- (a) a polyester film support;
- (b) a silicone coating composition on at least one side of said polyester film support said silicone coating comprising
- (i) a silica/silanol composition being derived from a composition comprising a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH).sub.3 in which R is selected from the group consisting of unsubstituted and inertly substituted alkyl radicals having one to three carbon atoms and unsubstituted and inertly substituted pheny radicals, at least about 70 weight percent of said silanol being of the above formula wherein R is CH.sub.3, said silica/silanol composition containing about 10 to about 70 weight percent of said colloidal silica and about 30 to about 90 weight percent of said partial condensate, based on the total solids weight;
- and
- (ii) one or more multifunctional acrylate monomers and/or oligomers;
- and
- (iii) optionally one or more photoinitiators.
A process for producing clear, flexible, coated, biaxially oriented polyester film comprising:
- (a) applying to a polyester film support a silicone coating composition on at least one side of said polyester film support said silicone coating comprising:
- (i) a silica/silanol composition being derived from a composition comprising a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH).sub.3 in which R is selected from the group consisting of unsubstituted and inertly substituted alkyl radicals having one to three carbon atoms and unsubstituted and inertly substituted phenyl radicals, at least about 70 weight percent of said silanol being of the above formula wherein R is CH.sub.3, said silica/silanol composition containing about 10 to about 70 weight percent of said colloidal silica and about 30 to about 90 weight percent of said partial condensate, based on the total solids weight;
- and
- (ii) one or more multifunctional acrylate monomers and/or oligomers;
- and
- (iii) optionally one or more photoinitiators;
- and
- (b) Radiation curing said silicone coating composition.
Dependencies are inferred from the claim text.