Method of manufacturing polyimide foam shapes having improved de

Details Method of manufacturing polyimide foam shapes having improved de Method of manufacturing polyimide foam shapes having improved de

1990-02-07

1990-12-25

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 451, 264 453, 264 54, 264 71, 264129, 264140, 428290, 4283144, 4283179, 4283191, 521 54, 521184, 521185, 521189, B29C 6722

Patent

active

049801023

ABSTRACT:
A method of manufacturing lightweight shapes from polyimide foam in which density discontinuities such as cavities, varying cell size, or swirl marks are substantially eliminated. A block or bun of polyimide foam is prepared in a conventional manner which results in a high density rind and other discontinuities. The foam is chopped into fine flakes in a chopper with a continuous flow of air to prevent electrostatic attachment of the flakes to the chopper and ducting. The flakes are mixed with a quantity of polyimide precursor and then heated to cause the precursor to bond the flakes into a uniform mass having highly uniform and predictable density. This is a very economical process since portions of the original bun may be used which would ordinarily be discarded. An alternative method is described whereby the flakes can be bonded together by using the precursor in the form of a partially cured foam either as a binder, or by making the flakes of partially cured foam.

REFERENCES:
patent: 4518717 (1985-05-01), Long et al.
patent: 4520071 (1985-05-01), Noda et al.
patent: 4865784 (1989-03-01), Bongers et al.

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