Blowing agent composition

Details Blowing agent composition Blowing agent composition

1978-01-18

1980-01-15

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

264 54, 264DIG5, 521 56, 521 92, 521123, 521143, 521183, 521184, 521185, 521189, 521908, 521910, C09K 330, C08J 908

Patent

active

041838220

ABSTRACT:
The present invention relates to a process for expanding thermoplastic polymer compositions, notably those containing polymers having processing temperatures in excess of 200.degree. C. and/or containing an ingredient which is susceptible to ammonia, characterized in that as the blowing agent certain carbonates (notably zinc carbonate) are used. Preferably a nucleating agent and a weak acid are present to aid cell formation.
The invention also includes expandable polymer compositions and blowing agent formulations containing the carbonates.

REFERENCES:
patent: 2386995 (1945-10-01), Wigal
patent: 3466353 (1969-09-01), Turner
patent: 3639649 (1972-02-01), McGrath et al.
Handbook of Chemistry and Physics, 46th Ed., Chemical Rubber Co., 1965-1966, pp. B160 and B239.

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