Patent · US Expired

Cyclic pyrophosphites and compositions stabilized therewith

US5475042A · kind A · utility

1Cited by
10References
17Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMar 21, 1995
Grant dateDec 12, 1995
Priority date—
Expiry dateMar 21, 2015

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08K5/527
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

Novel cyclic pyrophosphite of formula I ##STR1## are prepared from the corresponding 6-chloro and 6-oxo phosphepins or phosphocins. The cyclic pyrophosphites are effective process stabilizers for organic materials subject to thermal, oxidative or actinic induced degradation, particularly polyolefins and especially polypropylene.

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