Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1995-01-17
1996-05-21
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
2641761, 526 62, 528196, 528167, C08G 6400
Patent
active
055191061
ABSTRACT:
A process for preparing an aromatic polycarbonate resin from an aromatic dihydroxy compound and a carbonate diester by transesterification in the presence of a transesterification catalyst comprising; reacting a purified carbonate diester with an aromatic dihydroxy compound in the presence of a transesterification catalyst to form a polycarbonate prepolymer; said carbonate diester containing benzophenone and benzoate ester derivatives having a molecular weight of less than 1,000, each in an amount of 100 ppm or less, said polycarbonate prepolymer having a viscosity average molecular weight of 5,000 to 20,000 at a temperature of 140.degree. to 280.degree. C., the reaction pressure being from 0.1 Torr to normal pressure; polymerizing said prepolymer at a temperature of 240.degree. to 350.degree. C. in a lateral, bi-axial, self-cleaning reactor to obtain an aromatic polycarbonate resin having a viscosity average molecular weight of 15,000 to 60,000. The aromatic polycarbonate is colorless and transparent and is suitable for extrusion molding.
REFERENCES:
patent: 3410823 (1968-11-01), Cleveland
patent: 3492268 (1970-01-01), Baker
patent: 3897392 (1975-07-01), Haupt et al.
patent: 4383092 (1983-05-01), Ko et al.
patent: 4514357 (1985-04-01), Kawaguchi et al.
patent: 4628081 (1986-12-01), Mark et al.
patent: 4948871 (1990-08-01), Fuknoka et al.
patent: 5204377 (1993-04-01), Fukawa et al.
patent: 5214073 (1993-05-01), Fukawa et al.
Database WPI, Derwent Publications, AN 80-91213C, JP-B-61 039 972, Sep. 6, 1986.
Database WPI, Derwent Publications, AN 92-213351, JP-A-4 142 329, May 15, 1992.
Patent Abstracts of Japan, vol. 17, No. 30 (C-1018), Jan. 20, 1993, JP-A-04 249 531, Sep. 4, 1992.
Polymer Degradation and Stability, vol. 14, 1986, pp. 1-22, A. Rivation, et al., "The Photo-Chemistry of Bisphenol-A Polycarbonate Reconsidered: Part 2 -FTIR Analysis of the Solid-State Photo-Chemistry in Dry Conditions".
Journal of Polymer Science, vol. 23, No. 2, Feb. 1985, pp. 343-353, CH. Bailly, et al., "Crystallization of Bisphenol-A Polycarbonate Induced by Organic Salts: Chemical Modification of the Polymer. I. Model Reactions".
N. Schnell, "Chemistry and Physics of Polycarbonates," pp. 44-51.
Kashiwagi Takeshi
Kimura Masatoshi
Nukui Masahiro
Shoji Hidekazu
Tayama Takao
Mitsubishi Chemical Corporation
Mosley Terressa
Seidleck James J.
LandOfFree
Process for the preparation of aromatic polycarbonate resins does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the preparation of aromatic polycarbonate resins, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of aromatic polycarbonate resins will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2038834