Thermoplastic processing of unplastifiable polymers

Details Thermoplastic processing of unplastifiable polymers Thermoplastic processing of unplastifiable polymers

1992-05-27

1994-08-30

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By treating occluded solids

264 83, 264126, B29C 6720

Patent

active

053425618

ABSTRACT:
A process for thermoplastic processing and sintering an unplastifiable polymer comprises dispersing the unplastifiable polymer in powder form in a melt of a polyacetal or a mixture of polyacetals, cooling the resulting mixture, granulating it, forwarding the granules to a thermoplastic processing stage, injection or extrusion molding, exposing the molding to an atmosphere which contains an acidic gas, thereby de-polymerizing the polyacetal, enveloping the remaining porous molding on all sides in a gas/liquid-impermeable film, heating in an autoclave, and isostatically sintering the molding with pressure from all sides to form the finished article.

REFERENCES:
patent: 3917761 (1975-11-01), Scheuerlein et al.
patent: 4265794 (1981-05-01), Pett et al.
patent: 4671912 (1987-06-01), Komatsu et al.

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