Patent · US Expired

Method for preparing silicon with high purity ester function

US6455641B1 · kind B1 · utility

1Cited by

2References

17Claims

0Family size

Assignee

RHODIA CHIMIE · FR

Inventors

Philippe Jost · Vernaison, FR
Gerard Mignani · Val-de-Reuil, FR
Philippe Olier · Val-de-Reuil, FR

Key dates

Filing date	Aug 15, 2000
Grant date	Sep 24, 2002
Priority date	—
Expiry date	Aug 15, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G77/38
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention concerns a method for preparing polyorganosiloxanes with high purity ester function (acetoxyalkyl or acetoxyalkenyl), consisting in: hydrosilylation between a hydrogenopolyorganosiloxane oil and &agr;-olefin alcohol; esterification of the resulting hydroxy-alkylated or polyorganosiloxane with an acetyl halide; elimination of &agr;-olefin derivatives and the halohydric acid formed. The resulting polyorganosiloxanes with ester function (acetoxyalkyl) have global siloxane, &agr;-olefin unit and/or &agr;-olefin impurities contents corresponding to a number of &agr;-olefin groups for 100 g of polyorganosiloxane, with ester function less than 10−3 mol.

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