Patent ID: 7790292

Claim:
A window article comprising: a frame and a sheet supported by the frame, wherein the sheet comprises a polysiloxane copolymer composition comprising: a.) a polysiloxane unit of the formula: or of the formula: wherein E is 4 to 50; each R is the same or different and is a C 1-13 monovalent organic group, and each R 2 is independently a divalent C 1-30 alkylene or C 7-30 arylene-alkylene; and Ar is a C 6-30 arylene group; and b.) an arylate-containing unit consisting of: 50 to 100 mole percent of arylate ester units, wherein the arylate ester units are isophthalate-terephthalate-resorcinol ester units of the formula: less than 50 mole percent aromatic carbonate units, wherein the aromatic carbonate units comprise less than 30 mole percent resorcinol carbonate units of the formula: and less than 35 mole percent bisphenol carbonate units of the formula: wherein R a , R b , and R f are each independently C 1-12 alkyl or halogen; R c and R d are each independently hydrogen, C 1-12 alkyl, cyclic C 1-12 alkyl, C 7-12 arylalkyl, C 1-12 heteroalkyl, or cyclic C 7-12 heteroarylalkyl; R 1 is derived from resorcinol; p, q, and u are independently 0 to 4, wherein m is 5 to 75 and n is 3 to 50, and the sum of the mole percentages of isophthalate-terephthalate-resorcinol ester units, resorcinol carbonate units, and bisphenol carbonate units is 100 mole percent, wherein the siloxane units of the polysiloxane unit are present in the polysiloxane copolymer composition in an amount of 0.2 to 10 wt % based on the weight of the polysiloxane copolymer composition, wherein the properties of the polysiloxane composition are such that it can be molded into a test chip having a thickness of 2.0±0.12 millimeters that has a haze of less than or equal to 3%, according to ASTM D1003-00, and wherein the sheet has a 2 minute integrated heat release rate of less than or equal to 65 kilowatt-minutes per square meter (kW-min/m 2 ) and a peak heat release rate of less than 65 kilowatts per square meter (kW/m 2 ) as measured using the method of FAR F25.4, in accordance with Federal Aviation Regulation FAR 25.853 (d).