Patent · US Active

Process for preparing polysulfane silanes

US11697659B2 · kind B2 · utility

0Cited by

2References

9Claims

0Family size

Assignee

Evonik Operations GmbH · DE

Inventors

Helmut Droege · Qingdao, CN
Julia HERMEKE · Gerlingen, DE
Kai Dieter BOLDT · Hanau, DE

Key dates

Filing date	Feb 2, 2021
Grant date	Jul 11, 2023
Priority date	—
Expiry date	Feb 2, 2041

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07F7/1892
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Process for preparing polysulfane silanes of the formula I (R1O)3-mR2mSi—R3—Sx—R3—SiR2m(OR1)3-m I, by reaction of silane of the formula II (R1O)3-mR2mSi—R3-Hal II, with one or more metal sulfides of the formula III Me(SH)f and/or Me3-fSx-y III, optionally in the presence of one or more salts of monohydric or polyhydric acids, with the optional addition of y mol of sulfur in aqueous R1—OH solution, wherein the water content of the aqueous R1—OH solution is 5% to 40% by weight, wherein

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