Method of making mercaptoalkylalkyldialkoxysilanes

Details Method of making mercaptoalkylalkyldialkoxysilanes Method of making mercaptoalkylalkyldialkoxysilanes

2005-01-18

2005-01-18

Barts, Samuel (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

Reexamination Certificate

active

06844460

ABSTRACT:
Mercaptoalkylalkyldialkoxysilane compositions are prepared by reacting an alkoxysilane containing an unsaturated organic group, with a sulfur containing organic acid, in the presence of a peroxide catalyst. This step produces a thiol ester. In the next step, methanolysis of the thiol ester is carried out in the presence of a basic catalyst. The resulting product is a mercaptoalkylalkyldialkoxysilane composition such as mercaptoethylmethyldimethoxysilane, mercaptomethylmethyldiethoxysilane, mercaptopropylmethyldiethoxysilane, or mercaptopropylmethyldimethoxysilane. Carrying out the first step of the reaction at least in part in the presence of air obtains maximum efficiency.

REFERENCES:
patent: 4082790 (1978-04-01), Speier
patent: 5223575 (1993-06-01), Mori et al.
Preparation of Silylalkanethiols, Gornowicz et al, J. Org. Chem. 1968 33(7) pp. 2918-2924.

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