Abstract: A high molecular weight stabilizer compound formed as an ester of 3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy-benzene-propanoic acid, or structural variants thereof, to impart improved resistance to the effects of ultraviolet radiation to polycarbonate comprising polymers, a process for the preparation of said compound, and articles of manufacture comprising said compound.

Abstract: A copolymeric polycarbonate containing repeating constituent units having formula [I] below and repeating constituent units having formula [II] below in a molar ratio of from 98:2 to 40:60. ##STR1## The above-described copolymeric polycarbonates have excellent resistance to chemicals, heat resistance and flame retardancy without compromising the impact resistance and good hues intrinsic to polycarbonates.

Abstract: A skeletal layer of a first polymeric material, consisting of two parallel plates interconnected by spaced-apart webs, is overlain on at least one plate surface by a reinforcing layer of a more wear-resistant or otherwise protective second polymeric material, possibly with interposition of an equalizing layer of a third polymeric material. The reinforcing layer may carry a lower-melting coating of a fourth polymeric material serving to hold a covering such as a textile fabric in position thereon. The voids of the skeletal layer may be filled with foam plastic. The composite panel can be formed by joint extrusion of all polymeric layers and can be subjected to subsequent deformation under heat and pressure into a shaped body.