Abrasion resistant silicone coated polycarbonate article

A coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having on at least one surface thereof (i) an adhesion promoting primer layer having a controlled thickness of from about 0.015 to about 0.15 mil consisting essentially of a thermoset acrylic polymer;

• and (ii) a top coat on said primer layer comprising the thermally cured product of a composition comprising a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of at least one silanol, said composition containing 10 to 50 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate.

A coated polycarbonate article comprising a polycarbonate substrate having on at least one surface thereof (i) an adhesion promoting primer layer having a controlled thickness of from about 0.015 to about 0.15 mil consisting essentially of a thermoset acrylic polymer, and (ii) a top coat on said primer layer comprised of a colloidal silica-filled thermoset organopolysiloxane, said thermoset organopolysiloxane being the thermally cured product of at least one silanol.

A coated polycarbonate article comprising a polycarbonate substrate having on at least one surface thereof (i) a primer layer having a controlled thickness of from about 0.015 to about 0.15 mil consisting essentially of a thermoset acrylic polymer which is the thermally cured product of a thermosettable acrylic polymer;

• and (ii) a top coat composition on said primer layer, said top coat composition comprising a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of at least one silanol, said composition containing 10 to 50 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate.