Patent · US Expired

Process for the preparation of block copolymers

US6153695A · kind A · utility

0Cited by

5References

4Claims

0Family size

Assignee

Fina Research, S.A. · BE

Inventors

Emmanuel Lanza · Brussels, BE
Jean Naveau · Nivelles, BE

Key dates

Filing date	Apr 7, 1999
Grant date	Nov 28, 2000
Priority date	—
Expiry date	Apr 7, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F297/044
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process is disclosed for manufacturing coupled radial block copolymers of the S-B-Li type having improved optical properties, which process utilizes coupling agents having from about 3 to about 7 epoxy groups per mole.

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