Patent · US Expired

Reacting polycarbonate resin with aryl chlorocarbonate to improve aging characteristics

US4460752A · kind A · utility

11Cited by

4References

8Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Dieter Neuray · Krefeld, DE
Dieter Margotte
Erhard Tresper · Krefeld, DE
Gunter Jacobs · Krefeld, DE

Key dates

Filing date	Oct 25, 1982
Grant date	Jul 17, 1984
Priority date	—
Expiry date	Oct 25, 2002

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G64/28
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for the preparation of polycarbonates from diphenols and/or chlorocarbonic acid esters thereof and phosgene by the two-phase boundary process wherein said polycarbonate is reacted with aryl chlorocarbonate is disclosed; the reaction products are noted for their improved ageing and hydrolysis characteristics which render them useful as thermoplastic molding compositions.

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