Abstract: A method is provided for making abrasion resistant, non-opaque thermoplastic articles, for example, silicone-coated polycarbonate sheet useful as glazing material. A mixture of a certain UV absorber, for example a cyanoacrylate, and light stabilizer, such as a piperidine derivative, has been found to impart improved weathering resistance to the silicon-coated thermoplastic articles when used as part of an acrylic primer coating between the silicone top coat and the thermoplastic substrate.

Abstract: A shaped, non-opaque coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on the surface thereof a non-opaque primer layer comprised of from about 25 to about 85 weight percent of a thermoset acrylic polymer and from about 15 to about 75 weight percent of at least one ultraviolet light screening compound, and disposed on said primer layer a non-opaque top coat comprised of a colloidal silica filled thermoset organopolysiloxane.

Abstract: A shaped, non-opaque coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on the surface thereof a non-opaque primer layer comprised of from about 25 to about 85 weight percent of a thermoset acrylic polymer and from about 15 to about 75 weight percent of at least one ultraviolet light absorbing compound, and disposed on said primer layer a non-opaque top coat comprised of a thermoset organopolysiloxane.

Abstract: A method of enhancing the adhesion of polymethyl methacrylate to a surface of silicon dioxide utilizing a solution of carboxylic acid is described.

Abstract: Sulfonate esters of hydroxybenzotriazoles have been found useful in imparting weathering resistance to plastic substrates when applied as part of a UV curable resin which is thereafter cured under ultraviolet light.

Abstract: A process for producing an ultraviolet radiation stabilized polymeric, particularly polycarbonate, article comprising impregnation of the surface layers of said article with an ultraviolet radiation absorber by first applying onto the surface of said article an ultraviolet radiation stabilizing composition containing an ultraviolet radiation absorber and a nonaggressive liquid carrier, and then heating the article with the stabilizing composition on its surface to a temperature sufficient for said absorber to diffuse into the surface layers of said article but insufficient to deleteriously affect the properties of the polymer.

Abstract: A process for producing an ultraviolet radiation stabilized polymeric, particularly polycarbonate, article comprising impregnation of the surface of said article with an ultraviolet radiation absorber by heating said polymeric article and applying onto the surface of said heated article an ultraviolet radiation stabilizing composition containing an ultraviolet radiation absorbing compound and a nonaggressive carrier.

Abstract: A shaped, non-opaque coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on the surface thereof a non-opaque primer layer of controlled thickness comprised of a thermoset acrylic polymer and disposed on said primer layer a non-opaque top coat comprised of a thermoset organopolysiloxane.

Abstract: A non-opaque coated polycarbonate shaped article, and a process for producing the same, having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having thereon (i) a primer layer comprised of a thermoplastic acrylic polymer containing functional groups; and (ii) a top coat containing a thermoset organopolysiloxane on said primer layer.The process for producing said coated polycarbonate article comprises the steps of: (i) priming the surface of a polycarbonate substrate by forming a primer layer comprised of a thermoplastic acrylic polymer containing functional groups; (ii) applying a top coat composition containing a further curable organopolysiloxane onto the primed substrate; and (iii) curing the further curable organopolysiloxane to form a hard, abrasion and chemical solvent resistant top coat which is tenaciously and durably adhered to the polycarbonate substrate.

Abstract: A shaped, non-opaque coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on the surface thereof a non-opaque primer layer of controlled thickness comprised of a thermoset acrylic polymer and disposed on said primer layer a non-opaque top coat comprised of a colloidal silica filled thermoset organopolysiloxane.

Abstract: A non-opaque coated polycarbonate shaped article, and a process for producing the same, having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having thereon (i) a primer layer comprised of a thermoplastic acrylic polymer containing functional groups; and (ii) a top coat containing a thermoset organopolysiloxane on said primer layer. The process for producing said coated polycarbonate article comprises the steps of: (i) priming the surface of a polycarbonate substrate by forming a primer layer comprised of a thermoplastic acrylic polymer containing functional groups; (ii) applying a top coat composition containing a further curable organopolysiloxane onto the primed substrate; and (iii) curing the further curable organopolysiloxane to form a hard, abrasion and chemical solvent resistant top coat which is tenaciously and durably adhered to the polycarbonate substrate.

Abstract: A process for providing a protective coating on a polycarbonate substrate comprising (i) applying onto said polycarbonate substrate a priming emulsion composition containing (a) a thermosettable acrylic polymer, (b) an ultraviolet light absorber selected from the benzylidene malonates and cyanoacrylates, (c) water, and (d) a hydroxy ether or an alkanol; (ii) curing the thermosettable acrylic polymer thereby forming a primer layer containing a thermoset acrylic and an ultraviolet light screener on said substrate; (iii) applying a top coat composition containing colloidal silica and a further curable organopolysiloxane; and (iv) curing said further curable organopolysiloxane thereby obtaining a silica filled thermoset organopolysiloxane top coat.

Abstract: A process for providing a protective coating on a polycarbonate substrate comprising (i) applying onto said polycarbonate substrate a priming emulsion composition containing (a) a thermosettable acrylic polymer, (b) an ultraviolet light absorber selected from the benzylidene malonates and cyanoacrylates, (c) water, and (d) a hydroxy ether or a lower alkanol; (ii) curing the thermosettable acrylic polymer thereby forming a primer layer containing a thermoset acrylic and an ultraviolet light screener on said substrate; (iii) applying a top coat composition containing a further curable organopolysiloxane; and (iv) curing said further curable organopolysiloxane thereby obtaining a thermoset organopolysiloxane top coat.

Abstract: A process, and the article produced thereby, for providing a uniformly and tenaciously adhered abrasion resistant and chemical resistant non-opaque coating on polycarbonate articles. The process comprises priming the surface of the polycarbonate article with an adhesion promoting thermoplastic acrylic polymer by forming a thin film of said thermoplastic acrylic polymer on the surface of the polycarbonate article, applying a silica filled organopolysiloxane coating composition onto the primed polycarbonate article, and thereafter curing the silica filled organopolysiloxane to form a hard, abrasion and chemical solvent resistant top coat which is tenaciously adhered to the polycarbonate article. The non-opaque coated polycarbonate article produced by this process comprises a polycarbonate substrate having (i) a primer layer comprised of a thermoplastic acrylic polymer, and (ii) a thermoset silica filled organopolysiloxane top coat.

Abstract: A coated polycarbonate article, and a process for producing said article, having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having deposited thereon (i) a primer layer comprised of a thermoplastic acrylic polymer; and (ii) a top coat containing a thermoset organopolysiloxane disposed on said primer layer. The process for producing said coated polycarbonate article comprises (i) priming the surface of a polycarbonate substrate with a thermoplastic acrylic polymer by forming a thin film of said thermoplastic acrylic polymer on the surface of said substrate, (ii) applying a top coating composition containing a further curable organopolysiloxane onto the primed substrate, and (iii) curing the further curable organopolysiloxane to form a hard, abrasion and chemical solvent resistant top coat which is tenaciously adhered to the polycarbonate substrate.

Abstract: A shaped non-opaque coated polycarbonate article having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having disposed on the surface thereon a non-opaque primer layer comprised of a thermoplastic acrylic polymer containing functional groups and disposed on said primer layer a non-opaque top coat comprised of a colloidal silica filled thermoset organopolysiloxane.

Abstract: Urethanes of hydroxybenzotriazoles and hydroxybenzophenones which can be chemically modified upon heating have been found useful in imparting weather resistance to plastic substrates when applied as part of a UV curable resin which can be subsequently heated after cure. UV curable resins containing such urethanes and the use of such resins to treat thermoplastic substrates are also described.

Abstract: Urethanes of hydroxybenzotriazoles and hydroxybenzophenones which can be chemically modified upon heating have been found useful in imparting weather resistance to plastic substrates when applied as part of a UV curable resin which can be subsequently heated after cure. UV curable resins containing such urethanes and the use of such resins to treat thermoplastic substrates are also described.