Method of making porous inorganic particle filled polyimide foam

Details Method of making porous inorganic particle filled polyimide foam Method of making porous inorganic particle filled polyimide foam

1989-02-21

1989-09-12

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

156 78, 156245, 1563315, 1563318, 264 54, 264 71, 264129, 428290, 4283144, 4283179, 4283191, 521 54, 521 91, 521122, 521123, 521184, 521185, 521189, 523218, 523219, B29C 3348

Patent

active

048657840

ABSTRACT:
A method of making thermal insulating products comprising porous, lightweight, high temperature resistant inorganic particles in a polyimide foam matrix and the product thereof. A polyimide precursor provided is mixed with about equal weight of flake-like porous inorganic particles to substantially uniformly coat the particles with powder. The mixture is placed in a mold and compressed slightly. The assembly is heated to the foaming temperature of the polyimide precursor for a period suitable to produce uniform foaming. Then the temperature is raised to the curing and crosslinking temperature of the precursor for a time period sufficient to produce complete cure. A high temperature and flame resistant, light weight, highly insulating product results. If desired, protective sheets of material may be bonded to selected product surfaces during or after the molding operation.

REFERENCES:
patent: 4518717 (1985-05-01), Long et al.
patent: 4520071 (1985-05-01), Noda et al.
patent: 4814356 (1989-03-01), Bongers et al.

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