Patent · US Expired

Increasing the molecular weight of polycondensates

US5807932A · kind A · utility

13Cited by

5References

14Claims

0Family size

Assignee

Ciba Specialty Chemicals Corporation · US

Inventors

Rudolf Pfaendner · Rimbach, DE
Kurt Hoffmann · Taufkirchen, DE
Heinz Herbst · Herbstein, DE

Key dates

Filing date	Apr 9, 1997
Grant date	Sep 15, 1998
Priority date	—
Expiry date	Apr 9, 2017

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/5333
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a process for increasing the molecular weight of polycondensates, which comprises heating a polycondensate in the temperature range below the melting point and above the glass transition temperature in the solid phase of the polymer with additionof at least one sterically hindered hydroxyphenylalkylphosphonic ester or monoester.

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