Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
521 77, 528347, 528348, C08J 902
Aromatic polyamide foams having a density of 0.025 to 0.7 g./cm..sup.3 are prepared by heating N-alkyl 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.
patent: 3770669 (1973-11-01), Reske et al.
E. I. Du Pont de Nemours and Company
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