Patent ID: 7854983

Claim:
A method of producing a sheet, comprising: coating a curable composition on a face of a polycarbonate sheet, wherein the curable composition consists of an aminoplast resin, wherein the aminoplast resin is a melamine-formaldehyde resin having the structure wherein each occurrence of R 1 is independently hydrogen, a methylene bridge to another melamine nucleus, or CH 2 OR 2 , wherein R 2 is hydrogen or C 1 -C 12 alkyl; a polyol compound, wherein the polyol compound comprises an oligomeric aliphatic polyestercarbonate diol having a number average molecular weight of at least 200 atomic mass units; a UV-absorbing amount of a triazine compound, wherein the triazine compound has the structure wherein each occurrence of Ar is independently phenyl or substituted phenyl; wherein the substituents on the phenyl group may be hydroxy, amino, C 1 -C 12 hydrocarbyl, C 1 -C 12 hydrocarbyloxy, or C 1 -C 12 hydrocarbylamino; and R 7 is hydrogen, C 1 -C 16 hydrocarbyl wherein the hydrocarbyl group may contain nitrogen or oxygen heteroatoms, or wherein R 8 is hydrogen or C 1 -C 16 hydrocarbyl wherein the hydrocarbyl group may contain nitrogen or oxygen heteroatoms; and optionally, one or more of a solvent selected from C 1 -C 12 alcohols, C 3 -C 12 ketones, C 3 -C 12 esters, C 4 -C 12 ethers, C 3 -C 12 alkoxy alkanols, C 1 -C 12 halogenated hydrocarbons, C 2 -C 12 carboxylic acids, C 6 -C 18 aromatic compounds, and mixtures thereof, a hindered amine light stabilizer, a curing catalyst selected from alkyl acid phosphates, dialkyl acid phosphates, phosphoric acid, maleic acid, maleic anhydride, fumaric acid, chloromaleic acid, chloromaleic anhydride, alkyl acid phthalates, monoalkyl succinates, monoalkyl maleates, alkyl sulfonic acids, aryl sulfonic acids, sulfamic acid, and mixtures thereof, a catalyst stabilizer, and an additive selected from flow control agents, surfactants, viscosity modifiers, antifoaming agents, and mixtures thereof; and curing the curable composition to form a protective layer having a thickness of about 2 to about 40 micrometers.