Process for the production of closed-cell foam molded articles o

Details Process for the production of closed-cell foam molded articles o Process for the production of closed-cell foam molded articles o

1985-08-16

1987-06-09

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 55, 264DIG18, C08J 906, B29C 6722

Patent

active

046719105

ABSTRACT:
Closed-cell foam molded parts or articles of crosslinked polyolefin are manufactured according to a process comprising the steps of filling a foamable and crosslinkable polyolefin composition containing a blowing agent and a crosslinking agent into a closed mold and molding a correspondingly shaped, foamable product under pressure, the crosslinking reaction progressing without decomposition of the blowing agent; subsequent heating of the resultant foamable, crosslinked product to a blowing temperature between a pair of metal plates, wherein the product can expand biaxially within the region left between the metal plates; and then heating of the thus-obtained intermediate product under low pressure of about 1 bar so that it can expand into all directions with complete decomposition of the residual blowing agent to result in the completely foamed molded part.

REFERENCES:
patent: 3818086 (1974-06-01), Stastny et al.

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