Patent · US Expired

Process for the production of linear polyesters

US3998793A · kind A · utility

3Cited by

2References

3Claims

0Family size

Assignee

Zimmer, Inc. · US

Inventors

Werner Gey · Offenbach am Main, DE
Wolfgang Langhauser

Key dates

Filing date	Mar 6, 1975
Grant date	Dec 21, 1976
Priority date	—
Expiry date	Mar 6, 1995

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/83
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

An alkali metal hydrogen monoglycolphosphate is added to the reaction product of diethylene glycol and dimethyl terephthalate to arrest the ester-interchange reaction and nullify the action of the divalent metal salt catalyst. These phosphates are easy to handle and convert the catalyst to an inactive compound which does not adversely affect subsequent polycondensation of the diethylene glycol terephthalate.

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