摘要:
A uniaxially-stretched, extruded film comprising a polycarbonate, wherein the extruded film has at least one wrinkle-free region having a first surface and a second surface, the at least one extruded wrinkle-free region comprising: an extruded thickness of more than 0 and less than 7 micrometer, and a variation of the thickness of the film of +/−10% of the thickness of the film, and a surface roughness average that is less than +/−3% of the average thickness of the film as measured by optional profilometery; and further wherein the film has a dielectric constant at 1 kHz and room temperature of at least 2.7; a dissipation factor at 1 kHz and room temperature of 1% or less; and a breakdown strength of at least 300 Volt/micrometer.
摘要:
Processes for preparing polyestercarbonates are disclosed. The processes allow for the consistent incorporation of adipic acid into a polymer generated from a dihydroxy compound, such as bisphenol-A, at levels greater than 99%. The polyestercarbonates so produced, as well as articles formed from the polyestercarbonates, are also disclosed herein.
摘要:
A method for preparing an aliphatic chloroformate comprising, introducing a mixture of at least one aliphatic hydroxyl compound, phosgene, at least one solvent, and optionally at least one organic base into a flow reactor to obtain a unidirectional flowing reaction mixture. The at least one aliphatic hydroxyl compound comprises at least one aliphatic hydroxyl group. The unidirectional flowing reaction mixture is maintained at a temperature between about 0° C. and about 60° C. to produce a single product stream comprising an aliphatic chloroformate.
摘要:
A polycarbonate is provided which contains residues of a dihydric phenol, at least one comonomer of a siloxane functional bisphenol, optionally, a branching agent and optionally, a flame retardant. Further embodiments of the present invention includes a method for producing a flame retardant polycarbonate.
摘要:
Disclosed herein are polysiloxane-polycarbonate copolymer articles. In one embodiment, a ⅛th inch thick bar formed from the thermoplastic composition has a B-Y ratio of less than or equal to about 1.75. This article, which has a dimension that is greater than or equal to 1.5 cm, comprises the thermoplastic composition which comprises a polysiloxane-polycarbonate copolymer, wherein the copolymer comprises repeating diorganosiloxane units of formula (1): wherein each R is, independently, a C1-13 monovalent organic group; and E has an average value of 20 to 35.
摘要:
Processes for preparing polyestercarbonates are disclosed. The processes allow for the consistent incorporation of adipic acid into a polymer generated from a dihydroxy compound, such as bisphenol-A, at levels greater than 99%. The polyestercarbonates so produced, as well as articles formed from the polyestercarbonates, are also disclosed herein.
摘要:
A thermoplastic composition is disclosed, comprising a polymer comprising: a polymer component comprising a polyestercarbonate copolymer comprising carbonate units and ester units having an aliphatic group, wherein the molar ratio of carbonate units to ester units in the polyestercarbonate copolymer is from 99:1 to 60:40; and 0.01 to 10 weight percent, based on the total weight of the polymer component, of a polymeric stabilizing compound comprising at least two epoxy groups, wherein the polymeric stabilizing compound has a weight average molecular weight of 1,000 to 18,000 Daltons; and wherein the thermoplastic composition has greater than 70% molecular weight retention after exposure to steam at 115° C. for 7 days. Also disclosed are articles comprising the composition.
摘要:
Disclosed herein are polysiloxane-polycarbonate copolymer articles. In one embodiment, a ⅛th inch thick bar formed from the thermoplastic composition has a B-Y ratio of less than or equal to about 1.75. This article, which has a dimension that is greater than or equal to 1.5 cm, comprises the thermoplastic composition which comprises a polysiloxane-polycarbonate copolymer, wherein the copolymer comprises repeating diorganosiloxane units of formula (1): wherein each R is, independently, a C1-13 monovalent organic group; and E has an average value of 20 to 35.
摘要:
A transparent, fire resistant branched polycarbonate-polysiloxane composition comprises polycarbonate, a short-chained polydiorganosiloxane, a branching agent, and flame retardants essentially free of bromine or chlorine, wherein the amount of short-chained polydiorganosiloxane is about 1 wt. % or less.