Process and product

Details Process and product Process and product

1978-02-27

1979-12-11

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

260 302, 260 332R, 260 338R, 521 98, 521184, 528336, C08J 902

Patent

active

041784197

ABSTRACT:
Aromatic polyamide foams having a density of 0.025 to 0.7 g./cm..sup.3 are prepared by heating N,N'-dialkyl aromatic polyamides having at least one .beta. hydrogen atom on the alkyl groups, a plasticizer and an aromatic sulfonic acid catalyst at 250.degree. to 340.degree. C. for a length of time sufficient to remove substantially all of the N-alkyl groups.

REFERENCES:
patent: 3770669 (1973-11-01), Reske et al.

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