Coated surface stabilized polycarbonate article
AssigneeGeneral Electric Company
InventorDaniel R. Olson
Life of this patent
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Abstract
A coated polycarbonate article having improved resistance to degradation by ultraviolet radiation, abrasion and attack by chemical solvents comprising a polycarbonate resin article with its surface layers impregnated with an ultraviolet radiation absorbing compound and having deposited on said impregnated surface a coating comprised of (i) a thermoplastic acrylic polymer containing functional groups primer layer; and (ii) a top coat disposed on said primer layer containing a colloidal silica filled thermoset organopolysiloxane.
Claims39
An improved coated polycarbonate resin article exhibiting improved resistance to degradation by ultraviolet radiation and improved adhesion and weatherability of the coating comprising a polycarbonate resin substrate having durably adhered to at least one surface thereof a coating comprised of (i) an adhesion promoting primer layer disposed on said surface comprised of a thermoplastic acrylic polymer containing functional groups, and (ii) adherently disposed on said primer layer a top coat containing a colloidal silica filled thermoset organopolysiloxane;
- the improvement consisting essentially of the surface of said polycarbonate substrate on which said coating is disposed being impregnated with at least one ultraviolet radiation absorbing compound.
An improved coated polycarbonate article exhibiting improved resistance to degradation by ultraviolet radiation and improved adhesion and weatherability of the coating comprising a polycarbonate resin substrate having adherently disposed on at least one surface thereof (i) an adhesion promoting primer layer containing a thermoplastic acrylic polymer containing functional groups disposed on said surface;
- and (ii) adherently disposed on said primer layer a top coat containing the cured product of a composition comprised of a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of at least one silanol, said composition containing from about 10 to about 50 weight percent solids comprised of from about 10 to about 70 weight percent colloidal silica and from about 30 to about 90 weight percent of the partial condensate;
- the improvement consisting essentially of the surface layers of the surface of said polycarbonate substrate on which said primer layer and said top coat are disposed being impregnated with at least one ultraviolet radiation absorbing compound.
An improved coated polycarbonate article exhibiting improved resistance to degradation by ultraviolet radiation and improved weatherability of the coating comprising a polycarbonate resin substrate having disposed on at least one surface thereof (i) an adhesion promoting primer layer comprised of a thermoplastic acrylic polymer containing functional groups disposed adherently on said surface;
- and (ii) a further curable top coat composition disposed on said primer layer, said top coat composition comprised of a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of at least one silanol, said composition containing from about 10 to about 50 weight percent solids comprised of from about 10 to about 70 weight percent colloidal silica and from about 30 to about 90 weight percent of said partial condensate;
- the improvement consisting essentially of the surface of said polycarbonate substrate on which said primer layer and said top coat composition are disposed being impregnated with at least one ultraviolet radiation absorbing compound.
Dependencies are inferred from the claim text.