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

US4329499A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Walter Horstmann · Bensberg, DE
• Knut Hammerstrom · Cologne, DE

Key dates

• Filing date: Nov 20, 1980
• Grant date: May 11, 1982
• Expiry date: Nov 20, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C309/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A di- or tri-sulphonic acid hydrazide of an alkylated diphenyl ether, said hydrazide being of the formula ##STR1## wherein R.sub.1 and R.sub.2 are identical or different and represent halogen or a lower alkyl radical and R.sub.1 and R.sub.2 can denote hydrogen, PA1 R.sub.3 denotes a lower alkyl radical and PA1 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.