Patent · US Expired

High-molecular weight, segmented, polycarbonate elastomers

US4196276A · kind A · utility

18Cited by

6References

14Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Manfred Schreckenberg · Krefeld, DE
Klaus Konig · Leverkusen, DE
Dieter Freitag · Krefeld, DE
Volker Serini · Krefeld, DE

Key dates

Filing date	Jan 16, 1978
Grant date	Apr 1, 1980
Priority date	—
Expiry date	Jan 16, 1998

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/64
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

High-molecular weight polycarbonate elastomers are produced by reacting polymer segments having an average molecular weight (Mn) of more than 600 and carboxyl groups with diphenols and phosgene according to the two-phase boundary polycondensation process at a pH value between about 9 and about 14 and a temperature between about 0.degree. C. and 80.degree. C. and, thereafter, either heat-treating the resulting reaction products at temperatures between about 40.degree. C. and about 100.degree. C. or gelling the resulting reaction products in solution in organic solvents.

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