Aromatic sulfonyl hydrazides and semicarbazides as chemical blowing agents

摘要

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.