Polycarbonate

About: Polycarbonate is a research topic. Over the lifetime, 14032 publications have been published within this topic receiving 141740 citations. The topic is also known as: PC & Polycarbonate, PC.

Identification of Fluorescent Products Produced by the Thermal Treatment of Bisphenol-A-Based Polycarbonate

Abstract: Polycarbonate is routinely subjected to heat treatment, and the thermal degradation products formed during this thermal treatment give rise to a distinct structured fluorescence spectrum. The structured fluorescence emission is observed when polycarbonate is subjected to thermal treatment in air as well as in nitrogen. A mixture of thermal rearrangement products of polycarbonate including dibenzofuran and phenyl-2-phenoxybenzoate are mainly responsible for the structured fluorescence emission. Most of the thermal degradation products of polycarbonate undergo photolysis, leading to the formation of photoproducts, which subsequently undergo a photoinduced bleaching process, with the noted exception of phenyl-2-phenoxybenzoate. The exposure of polycarbonate to high temperature for only short time periods, simulating mild industrial processing conditions, results in the formation of a relatively small amount of thermal degradation products, which, accordingly, has only a minor effect on the photodegradation of polycarbonate. © 1994 John Wiley & Sons, Inc.

Transparent resin laminate and molded article used the same

Abstract: A transparent resin laminate comprising a polycarbonate resin base material, an acrylic resin layer comprising an ultraviolet absorbent coated on at least one surface of said polycarbonate resin base material and a cured layer formed by coating a composition comprising polyorganosiloxane and a silicone-containing polymer ultraviolet absorbent on said acrylic resin layer and then curing, wherein a difference of linear expansion coefficient between said polycarbonate resin base material and said acrylic resin layer and a difference of linear expansion coefficient between said acrylic resin layer and said cured layer are 0/° C. to 5×10 −5 /° C., respectively and a molded article used the same.

Compositions having low birefringence

Abstract: A thermoplastic molding composition suitable for the preparation of articles having low birefringence is disclosed. Accordingly, the composition contains polycarbonate and a polyester copolymer based on cyclohexane-dimethanol, ethylene glycol and phthalic acid. The invention resides in the findings that the incorporation of a polycarbonate resin having a melt flow index greater than 18 g/10 minutes impart to the composition low birefringence values. The composition is suitable for the preparation of optical storage media, including compact discs.

Catalyzed interfacial polycondensation polycarbonate process

Abstract: This invention relates to a catalyzed interfacial polycondensation aromatic polycarbonate process which comprises forming an agitated two-phase mixture comprising an organic solvent phase with catalyst and an aqueous phase containing an aromatic dihydroxy compound, a base and an ionic surfactant. A carbonyl halide is added to the mixture and reacted with the aromatic dihydroxy compound to form an aromatic polycarbonate. The aromatic polycarbonate is recovered from the aqueous phase.