摘要:
The present invention relates to a copolycarbonate and a molded article comprising the same. The copolycarbonates according to the present invention has a structure in which a specific siloxane compound is introduced in a main chain of the polycarbonate, and has effects of improving impact strength at room temperature, impact strength at low temperature, and melt index properties.
摘要:
The present invention relates to copolycarbonates and a composition comprising the same. The copolycarbonate according to the present invention has a structure in which specific siloxane compounds are introduced in the main chain of polycarbonate and thus exhibits the effects of improving impact strength at room temperature, impact strength at low-temperature, and melt index.
摘要:
The present invention relates to a copolycarbonate and a composition comprising the same, and more specifically to a technique for improving flame retardance and chemical resistance while maintaining inherent impact strength and melt index of the copolycarbonate, by comprising a branched repeating unit in the copolycarbonate structure.
摘要:
Terpolymers suitable as molding resins are provided having aromatic polyester segments polycarbonate segments and polysiloxane segments of the structure ##STR1## where R.sup.1, R.sup.2, Y and D are as defined herein, and where the weight percentage of polyester and polycarbonate segments is from 50 to 99%, preferably 92 to 96%, and the weight percentage of polysiloxane segments is from 50 to 1%, preferably from 8 to 4%. Also provided is a one-step process to prepare the new terpolymers by reacting together a siloxane, a bisphenol and an aromatic dicarboxylic acid halide.
摘要:
A composition and method is provided for making polycarbonate utilizing an effective amount of a binary catalyst system, comprising a phase transfer catalyst and a tertiary organic amine, as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. for improved phosgene utiliziation.
摘要:
The present invention relates to the use of special monocarboxylic acids as chain terminators for the preparation of polycarbonates and of polyester carbonates, and to the polycarbonates and polyester carbonates obtainable according to the invention.
摘要:
A method is provided for making silicone polycarbonate block copolymers and polycarbonate blends thereof having reduced haze. Silicone polycarbonate block copolymer formation is effected by using a phase transfer catalyst to generate polycarbonate oligomers having at least one terminal haloformate group followed by the late addition of hydroxyaryl terminated polydiorganosiloxane.
摘要:
A process for the preparation of a polycarbonate comprising reacting a diaryl carbonate with a bisphenol to produce a polycarbonate and a phenol, regenerating the diaryl carbonate by reacting the phenol byproduct with a carbonyl halide, and optionally recycling the hydrogen halide using a metal Redox captive halogen swing reactor system.
摘要:
The invention relates to a method of preparing aromatic polycarbonate having a high molecular weight by boundary face condensation of carbonate oligomer in the presence of an aromatic monohydroxy compound as a chain stopper, base, water and organic solvent at a temperature of at most 70.degree. C., in which the components, among which the chain stopper, are mixed in static mixers to form a fine dispersion, reacting these in a residence zone with plug flow and repeating these steps at least once.
摘要:
The invention relates to poly(meth)acrylates having grafted-on polycarbonate chains, to their production and to their use as modifiers for thermoplastic polycarbonates having improved resistance to gasoline and/or improved impact strength at low temperatures and to their production.