Halogen-containing polycarbonate resin and process for producing same
AssigneeMitsubishi Chemical Industries Limited
InventorsHazime Mori, Katsuhisa Kohyama, Katsuhiko Nakamura, Shigeyuki Haruhata
Life of this patent
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Abstract
A halogen-containing polycarbonate resin is formed by co-polymerizing: (a) 15 to 55 parts by weight of a polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 500 to 10,000 and containing no aromatic halogen or less than 4% by weight of aromatic halogen, (b) 20 to 80 parts by weight of a halogen-containing polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 1,000 to 10,000 and containing 6 to 30% by weight aromatic halogen, and (c) 5 to 25 parts by weight of bisphenol A.
Claims11
A halogen-containing polycarbonate resin formed by copolyerizing in the presence of an organic solvent:
- (a) 15 to 55 parts by weight of a polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 500 to 10,000, containing no aromatic halogen or less than 4% by weight of aromatic halogen and containing recurring units derived from bisphenol A and phosgene,
- (b) 20 to 80 parts by weight of a halogen-containing polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 1,000 to 10,000, containing 6 to 30% by weight of aromatic halogen and containing recurring units derived from bisphenol A, halogenated bisphenol A and phosgene, and
- (c) 5 to 25 parts by weight of bisphenol A.
A process for forming a halogen-containing polycarbonate resin comprising:
- (a) copolymerizing in the presence of an organic solvent to form a solution of the halogen-containing polycarbonate in the organic solvent:
- (1) 15 to 55 parts by weight of a polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 500 to 10,000, containing no aromatic halogen or less than 4% by weight of aromatic halogen and containing recurring units derived from bisphenol A and phosgene,
- (2) 20 to 80 parts by weight of a halogen containing polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 1,000 to 10,000, containing 6 to 30% by weight of aromatic halogen and containing recurring units derived from bisphenol A, halogenated bisphenol A and phosgene, and
- (3) 5 to 25 parts by weight of bisphenol A;
- (b) washing said solution with an aqueous washing agent;
- and
- (c) recovering the polycarbonate resin from the organic solvent.
Dependencies are inferred from the claim text.