Patent · US Expired

Aromatic sulfonyl hydrazides and semicarbazides as chemical blowing agents

US4164611A · kind A · utility

3Cited by

9References

18Claims

0Family size

Assignee

Ciba-Geigy · US

Inventors

Andreas Schmidt · Braunschweig, DE
Hugo Illy · Reinach, CH
Rudolf Kirchmayr · Aesch, CH
Andre Schmitter · Hégenheim, FR

Key dates

Filing date	Jul 9, 1976
Grant date	Aug 14, 1979
Priority date	—
Expiry date	Jul 9, 1996

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J9/105
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.