Injection-moldable polybutylene terephthalate resin compositions

Details Injection-moldable polybutylene terephthalate resin compositions Injection-moldable polybutylene terephthalate resin compositions

1991-07-11

1992-07-07

Foelak, Morton

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C08K 510

Patent

active

051283999

ABSTRACT:
Polybutylene terephthalate (PBT) injection-molding compositions exhibit improved mold-release properties and sufficient extruder screw "bite" during injection molding. The PBT compositions are a polyblend of a PBT base resin with an effective amount (preferably between about 0.01 to 10 parts by weight) of a processing aid which is a sorbitan ester of a fatty acid having at least 12 carbon atoms. The PBT injection molding compositions of the invention may be used in a variety of end-use applications (e.g., the automotive and/or electronic industries) to form stable injection-molded thin-walled and/or complex-shaped articles.

REFERENCES:
patent: 4098752 (1978-07-01), Ohkawa et al.
patent: 4396730 (1983-08-01), Imahashi
patent: 4421804 (1983-12-01), Mori et al.
patent: 4675356 (1987-06-01), Miyata
patent: 4707511 (1987-11-01), Boutni
Derwent Assession No. 84-260 767, Questel Telesystems (WPIL), Derwent Publications Ltd., London, Abstract & JP-A-59 852.

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