Patent · US Expired

Stabilizing polyolefins with diacyl dihydrazides

US4038247A · kind A · utility

18Cited by

6References

8Claims

0Family size

Assignee

Ciba-Geigy · US

Inventors

Helmut Muller · Bensberg, DE
Siegfried Rosenberger · Riehen, CH
Heimo Brunetti · Reinach, CH

Key dates

Filing date	Jun 13, 1975
Grant date	Jul 26, 1977
Priority date	—
Expiry date	Jun 13, 1995

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/25
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for stabilizing homo- or copolymeric polyolefins, especially polypropylene, with certain symmetrical or asymmetrical diacyl dihydrazides is disclosed, said diacyl dihydrazides possessing good color properties, and said process being particularly advantageous with respect to thermooxidative decomposition in the presence of transition metals.

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