Patent · US Expired

Molecular weight increase and modification of polycondensates

US6469078B1 · kind B1 · utility

17Cited by

25References

14Claims

0Family size

Assignee

Ciba Specialty Chemicals Corporation · US

Inventors

Dirk Simon · Mutterstadt, DE
Rudolf Pfaendner · Rimbach, DE
Heinz Herbst · Herbstein, DE

Key dates

Filing date	May 15, 2000
Grant date	Oct 22, 2002
Priority date	—
Expiry date	May 15, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/5317
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

This invention relates to a process for increasing the molecular weight and/or for the modification of polycondensates during the processing in the melt, which comprises adding to the polycondensate a blend comprisinga) at least one polyfunctional anhydride (polyanhydride);b) at least one polyfunctional compound, the functional groups of which can react with the anhydride groups of component a); andc) at least one phosphonate.This invention also relates to the use of an additive blend for increasing the molecular weight and for the modification of polycondensates during the processing in the melt.

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