Process for producing flame retardant high temperature resistant

Details Process for producing flame retardant high temperature resistant Process for producing flame retardant high temperature resistant

1990-03-30

1993-01-12

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

264113, 264324, 26433112, B29C 4302

Patent

active

051788101

ABSTRACT:
A process for producing high-temperature resistant and flame-retardant shaped articles of polyimide polymers of the general formula ##STR1## wherein A represents a four-valent group and R represents a divalent aromatic group, by heating a manipulatable sheet-like structure to a temperature in the glass transition range of between 280.degree. C. and 360.degree. and pressing it at pressures ranging between 10 bar and 500 bar. The polyimide shaped bodies obtained have densities of at least 1.30 g/cm.sup.3. Preferably, they may be completed as sheets having uniform thicknesses of between 0.1 and 6 mm.

REFERENCES:
patent: 3286008 (1966-11-01), Power et al.
patent: 3985934 (1976-10-01), Farrissey, Jr. et al.
patent: 4271116 (1981-06-01), Jones
patent: 4613473 (1986-09-01), Layden et al.
patent: 4752355 (1988-06-01), Provost
patent: 5043128 (1991-08-01), Umeda
Chemical Abstracts 86:156997s.
Chemical Abstracts 89:25685c.

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