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US 2024/0352050 A1Published application
Process for making cyanoethyltrimethoxysilane
AssigneeDow Silicones Corporation
InventorsMichael Depierro, Kitty Liu, Xiaoyuan Zhou, Reza Panah, Aaron Greiner
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Abstract
A process for preparing cyanoethyltrimethoxysilane is performed via transesterification of cyanoethyltriethoxysilane with methanol in the presence of a catalyst. The cyanoethyltrimethoxysilane is useful as an adhesion promoter, a coupling agent, or a crosslinker. The cyanoethyltrimethoxysilane may be formulated in a polyorganosiloxane sealant composition.
Claims14
A process for preparing cyanoethyltrimethoxysilane, wherein the process comprises:
- 1) combining starting materials comprising
- (A) cyanoethyltriethoxysilane,
- (B) methanol, in a stoichiometric excess, and
- (C) an acid catalyst;
- thereby producing a transesterification reaction mixture;
- and
- optionally 2) adding to the transesterification reaction mixture (D) an activated carbon selected from the group consisting of
- (D1) bituminous coal activated carbon,
- (D2) coconut activated carbon with an iodine number of at least 1200 mg/g, and
- (D3) both (D1) and (D2);
- 3) removing materials comprising methanol, ethanol and the acid catalyst from the transesterification reaction mixture;
- and
- 4) repeating steps 1) to 3) one or more times.
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-12. (canceled)
A method for preparing a polyorganosiloxane sealant composition, wherein the method comprises:
- 1) combining starting materials comprising
- (A) cyanoethyltriethoxysilane,
- (B) methanol, in a stoichiometric excess, and
- (C) an acid catalyst;
- thereby producing a transesterification reaction mixture;
- and
- optionally 2) adding to the transesterification reaction mixture (D) an activated carbon selected from the group consisting of
- (D1) bituminous coal activated carbon,
- (D2) coconut activated carbon with an iodine number of at least 1200 mg/g, and
- (D3) both (D1) and (D2);
- 3) removing materials comprising methanol, ethanol and the acid catalyst from the transesterification reaction mixture;
- and
- 4) repeating steps 1) to 3) one or more times,
- thereby preparing a composition comprising cyanoethyltriethoxysilane;
- and
- adding the composition comprising the cyanoethyltrimethoxysilane to a polyorganosiloxane sealant composition.
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Dependencies are inferred from the claim text.