Process for making instant shaped foams

Details Process for making instant shaped foams Process for making instant shaped foams

1976-04-30

1978-02-21

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264177R, 264211, 264DIG5, 264DIG6, 264DIG13, B29D 2700

Patent

active

040752658

ABSTRACT:
In a process for rapidly producing a substantially uniform, elongated, cellular thermoplastic article comprising rapidly discharging from a vessel a pressurized gel of a solid thermoplastic amorphous polymer and a gaseous solvent in an amount in the range of from about 25-100% by weight of said polymer, said solvent being capable of forming a flowable gel with the polymer when subjected to superatomospheric pressure, the improvement for shaping the article comprising restraining sufficiently the speed of flow of the gel from the vessel through a die to form the desired shaped article with the gel at ambient temperature in said vessel.

REFERENCES:
patent: 2450436 (1948-10-01), McIntire
patent: 2576977 (1951-12-01), Stober
patent: 3102865 (1963-09-01), Sneary et al.
patent: 3227784 (1966-01-01), Blades et al.
patent: 3461193 (1969-08-01), Gilardi
patent: 3523916 (1970-08-01), Needham et al.
patent: 3785919 (1974-01-01), Hickman
Tordella, J.P. "Melt Fracture-Extrudate Roughness in Plastics Extrusion." In SPE Journal, Feb., 1956, pp. 36-40.
Bernhardt, Ernest C., Edt., "Processing of Thermoplastics Materials." New York, Reinhold, c1959, pp. 154-162 (SPE Plastics Engineering Series).
Salyer, I.O.; J. L. Schwendeman and C. E. McClung, "Evaluation of Four Foaming Techniques for Inflating a Pk.-2 Life Raft." In Journal of Cellular Plastics, Sept. 1968, pp. 345-356.

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