Reference

Continuous manufacture of plural different polycarbonates

Continuous manufacture of plural different polycarbonates. Hachiya, Hiroshi (Asahi Kasei Corporation, Japan). Jpn. Kokai Tokkyo Koho JP 2004026916 A2 29 Jan 2004, 16 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: ICM: C08G064-30. APPLICATION: JP 2002-182410 24 Jun 2002. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) In manuf. of polycarbonates by polymn. of arom. diols and diaryl carbonates in a molten state using 32 reactors, processes contg. one first polymn. and plural second polymn. are adopted. Thus, 3 different bisphenol A-diphenyl carbonate copolymers with Mn 9100 and 11,500 and for optical use, resp., were manufd. 2082-79-3 and 61951-89-1 are just another two chemicals used in this study. from one molten polymer with Mn 52,000. .