C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/174, 400/440
C08G 63/64 (2006.01) C08G 64/00 (2006.01) C08G 64/10 (2006.01) C08L 69/00 (2006.01)
Patent
CA 2035958
ABSTRACT A halogenated copolycarbonate, which contains reduced levels of Phenolic (-OH) End Groups and end groups which result from side reactions of process chemicals with the copolycarbonate chain (Process Chemical End Groups), has improved resistance to the degradation-inducing effects of such end groups and has improved washability. Such a halogenated copolycarbonate is characterized in that it (a) has a Phenolic End Group content of less than 275 ppm, (b) has a content of less than 90 ppm of the element of Process Chemical End Groups which is bonded to a copolycarbonate chain end, and (c) produces less than 0.5 absorbance units, per mole fraction of halogenated diphenol in the copolycarbonate, when measured on a spectrophotometer at 420 nm after the halogenated copolycarbonate has been heated for thirty minutes at 300°C and then dissolved in an organic solvent. 37,956-F
Smart & Biggar
The Dow Chemical Company
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