Process for preparing aromatic polyester-polystyrene block copol

Details Process for preparing aromatic polyester-polystyrene block copol Process for preparing aromatic polyester-polystyrene block copol

1991-10-17

1993-10-26

Short, Patricia A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525177, C08G 6381

Patent

active

052567354

ABSTRACT:
A process is disclosed for the preparation of aromatic polyester-polystyrene block copolymers by solution polycondensation of styrene polymers (A) having terminal functional groups reactive with acid halide or hydroxyl groups, aromatic dihydroxy compounds (B), and aromatic dicarboxylic acid dihalides (C) at (A)/[(B)+(C)] (by weight) of 5/95 to 80/20 and the polymers are suitable as molding materials for optical instruments for their good transparency, particularly low birefringence, low melt viscosity, and good mechanical strength.

REFERENCES:
patent: 4217427 (1980-08-01), Falk et al.
patent: 4980418 (1990-12-01), Sasaki et al.
Patent Abstracts of Japan, vol. 13, No. 379 (C-628) (3727) 22 Aug. 1989, (Abstract for JP-A-1 129 011 (Mitsubishi Rayon Co. Ltd) 22 May 1989).

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