Patent · US Expired

Molecular weight modification of thermoplastic polymers

US6949594B2 · kind B2 · utility

6Cited by

4References

16Claims

0Family size

Assignee

Ciba Specialty Chemicals Corporation · US

Inventors

Michael Roth · Herbstein, DE
Rudolf Pfaendner · Rimbach, DE
Dirk Simon · Mutterstadt, DE

Key dates

Filing date	May 22, 2001
Grant date	Sep 27, 2005
Priority date	—
Expiry date	May 22, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L2023/44
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a process for the molecular weight increase/crosslinking of non-halogen-containing thermoplastic polymers, in which process a composition comprising a) a non-halogen-containing thermoplastic polymer; b) a functional compound having at least two unsaturated carbon bonds; and c) an alkoxyamine having a structural unit (I), which forms free radicals at the melting temperature/processing temperature of the polymer, is mixed and heated above the melting point of the polymer in the case of crystalline polymers or the softening point in the case of amorphous polymers. The invention relates also to the composition itself, to the use thereof in increasing the molecular weight of polymers and to polymers having increased molecular weight or crosslinked polymers prepared in accordance with that process

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