Patent · US Expired

Decomposing polymers using NOR-HALS compounds

US6133414A · kind A · utility

17Cited by

9References

8Claims

0Family size

Assignee

Ciba Specialty Chemicals Corporation · US

Inventors

Rudolf Pfaendner · Rimbach, DE
Heinz Herbst · Herbstein, DE
Kurt Hoffmann · Taufkirchen, DE
Raymond Seltzer · New City, US
Matthew E. Gande · New Fairfield, US

Key dates

Filing date	Dec 14, 1998
Grant date	Oct 17, 2000
Priority date	—
Expiry date	Dec 14, 2018

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W30/62
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A method is described for the decomposition of polymers, especially waste plastics and used plastics, in which so-called NOR--HALS compounds--that is, for example, compounds comprising the group ##STR1## in which R* is C.sub.1 -C.sub.20 alkyl, OH-substituted C.sub.1 -C.sub.20 alkyl, optionally C.sub.1 -C.sub.4 alkyl-substituted C.sub.5 -C.sub.12 cycloalkyl or O- or S-interrupted C.sub.2 -C.sub.20 alkyl--are added and heating is carried out at temperatures which lie above the customary processing temperatures for polymers (280.degree. C. or more).

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