Aromatic sulfonyl hydrazides and semicarbazides as chemical blow

Details Aromatic sulfonyl hydrazides and semicarbazides as chemical blow Aromatic sulfonyl hydrazides and semicarbazides as chemical blow

1976-07-09

1979-08-14

Waltz, Thomas

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

Synthetic resins

Cellular products or processes of preparing a cellular...

260554, 260556H, 521 95, 521120, 521129, 521142, 521145, 521189, C07C13302, C07C143825, C08J 910

Patent

active

041646118

ABSTRACT:
Aromatic sulfonic acid hydrazides and semicarbazides having a sterically hindered phenol group are usable as blowing agents in the manufacture of foamed plastics articles. On heating to about 200 to 300.degree. C. they are splitting off nitrogen and the residue remaining in the foam acts as stabilizer against thermo-oxidative degradation of the plastic material.

REFERENCES:
patent: 2626933 (1953-01-01), Lober et al.
patent: 2640853 (1953-06-01), Sundholm
patent: 3152176 (1964-10-01), Hunter
patent: 3235519 (1966-02-01), Hunter
patent: 3344182 (1967-09-01), Amidon
patent: 3903157 (1975-09-01), Hunter
patent: 3925270 (1975-12-01), Hunter
patent: 3925466 (1975-12-01), Hunter
patent: 3933909 (1976-01-01), Herweh

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