Process for preparing expanded articles based on chlorotrifluoro

Details Process for preparing expanded articles based on chlorotrifluoro Process for preparing expanded articles based on chlorotrifluoro

1997-01-30

1998-11-17

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264DIG13, 521 85, B29C 4400

Patent

active

058371737

ABSTRACT:
The invention relates to a process for preparing expanded articles based on ethylene-chlorotrifluoroethylene copolymers having high dielectric characteristics consisting in mixing the copolymer with 0.5-2% by weight of boron nitride, extruding the blend at 260.degree.-300.degree. C., injecting into the molten blend nitrogen at 50-150 atmospheres and lowering the pressure for obtaining the expanded article.

REFERENCES:
patent: 3072583 (1963-01-01), Randa
patent: 4331619 (1982-05-01), Chung et al.
patent: 4764538 (1988-08-01), Buckmaster et al.
patent: 4877815 (1989-10-01), Buckmaster et al.
patent: 5610203 (1997-03-01), Buckmaster et al.
Chemical Abstracts, vol. 100, No. 24, 11 Jun. 1984, abstract No. 193049 and JP-A-59 015 432.
Database WPI, Week 9204, Derwent Publications Ltd., London, GB; AN 92-027223 & JP-A-03 272 516 (Hitachi Cable KK).
European Search Report, Feb. 20, 1996, Application No. EP 95 11 7050.

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