Production of fine-celled foams from styrene polymers

Details Production of fine-celled foams from styrene polymers Production of fine-celled foams from styrene polymers

1982-07-23

1984-05-01

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264DIG5, 521 91, 521 92, 521146, 521908, 521 93, C08J 900

Patent

active

044462530

ABSTRACT:
Fine-celled foams are produced by a process in which a styrene polymer is melted, the melt is mixed with a volatile blowing agent and a nucleating agent under superatmospheric pressure, the mixture is let down to atmospheric pressure, and the foam is cooled. The nucleating agent employed comprises from 0.02 to 2% by weight of the calcium salt of a long-chain fatty acid, and from 0.01 to 1% by weight of a finely divided, inorganic substance which is insoluble in the styrene polymer, a mixture of calcium stearate and magnesium oxide being preferred.

REFERENCES:
patent: 2576977 (1951-12-01), Stober
patent: 2577743 (1951-12-01), De Long
patent: 3026272 (1962-03-01), Rubens et al.
patent: 3072584 (1963-01-01), Karpovich
patent: 4085073 (1978-04-01), Suh
patent: 4289857 (1981-09-01), Hoki et al.

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