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

1992-12-23

1994-05-24

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...

525 90, C08F29300

Patent

active

053149548

ABSTRACT:
A process is disclosed for preparing of aromatic polyester-polystyrene block copolymers which comprises subjecting preferentially styrene polymers (A) having terminal functional groups reactive with acid chloride groups and an excess of aromatic dicarboxylic acid dihalides (C) to condensation and then subjecting continuously the resultant mixture and aromatic dihydroxy compounds (B) to interfacial polymerization at the ratio (A)/[(B)+(C)] by weight of 5/95 to 80/20, without separating reaction products of styrene polymers (A) and aromatic dicarboxylic acid dihalides (C), and the block copolymers thus prepared contain a small amount of uncopolymerized styrene polymers, have long aromatic polyester segments, show low birefringence, good transparency, exceptionally low birefringence, low melt viscosity, and good mechanical strength, and are particularly useful as materials for optical instruments.

REFERENCES:
patent: 4980410 (1990-12-01), Fryd et al.
patent: 4980418 (1990-12-01), Sasaki et al.

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