Patent · US Expired

Solid particles

US6710152B1 · kind B1 · utility

0Cited by

5References

9Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Rolf Lanze · Krefeld, DE
Michael Prein · Brasschaat, BE
Uwe Hucks · Alpen, DE

Key dates

Filing date	May 2, 2002
Grant date	Mar 23, 2004
Priority date	—
Expiry date	May 2, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G64/307
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Solid particles containing 10 to 90 parts by weight of a dihydroxy compound and 10 to 90 parts by weight of a carbonic acid ester are disclosed. Also disclosed is a process for the production of these particles, an apparatus suitable for the process and a method for their use in production of polycarbonate by transesterification of carbonic acid esters with dihydroxy compounds.

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