Alkyldiphenyl ether-sulphonic acid hydrazides, their preparation and their use as blowing agents

摘要

A di- or tri-sulphonic acid hydrazide of an alkylated diphenyl ether, said hydrazide being of the formula <IMAGE> (I) wherein R1 and R2 are identical or different and represent halogen or a lower alkyl radical and R1 and R2 can denote hydrogen, R3 denotes a lower alkyl radical and n represents the number 1 or 2. A process for the preparation of such hydrazides and the use of such hydrazides as chemical blowing agents in the production of foams from foamable compositions, especially rubbers and thermoplastic resins.