Production of foamed polymer structures

Details Production of foamed polymer structures Production of foamed polymer structures

1990-04-05

1991-11-12

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 26, 521183, 521184, 521185, 521189, C08V 902, B29C 3500

Patent

active

050648675

ABSTRACT:
Described are ways of improving the yields of specification grade polyimide foam on a consistent basis from one run to the next, by use of improved microwave-based foaming processes. In one such process, prior to the application of the microwave radiation, the body of polyimide precursor is compressed at a pressure that will reduce the bulk volume of the precursor and heated to a temperature below that at which any substantial foaming occurs. to accomplish the foaming, one further embodiment of the invention employs microwave radiation directed upon the top, sides and ends of the body of above-treated polyimide precursor and of the foam structure as it is developing maintaining the developing foam under a substantially vapor-impermeable microwave compatible shroud. The extent to which the microwave radiation impinges upwardly into the bottom of said body and said foam structure is curtailed, preferably by means of a metallic shield located below the precursor and developing foam structure.

REFERENCES:
patent: Re30213 (1980-02-01), Gagliani et al.
patent: 4153783 (1979-05-01), Gagliani et al.
patent: 4161477 (1979-07-01), Long et al.
patent: 4183838 (1980-01-01), Gagliani
patent: 4183839 (1980-01-01), Gagliani
patent: 4296208 (1981-10-01), Gagliani et al.
patent: 4305786 (1981-12-01), Shultz
patent: 4305796 (1981-12-01), Gagliani et al.
patent: 4439281 (1984-03-01), Schneider et al.
patent: 4822537 (1989-04-01), Lanier et al.
patent: 4883827 (1989-11-01), Ferro
patent: 4897234 (1990-01-01), Ferro
patent: 4897432 (1990-01-01), Lee et al.
patent: 4943598 (1990-07-01), Ferro
patent: 4943599 (1990-07-01), Ferro

Affiliated with

Also associated with

Rating

Production of foamed polymer structures does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Production of foamed polymer structures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production of foamed polymer structures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1013519