	US 12,378,362 B2
	Polydiorganosiloxane preparation
Xiuyan Wang, Shanghai (CN); Yi Guo, Shanghai (CN); Jiang Peng, Shanghai (CN); Zhiping Zeng, Shanghai (CN); and Qiang Hu, Shanghai (CN)
Assigned to DOW SILICONES CORPORATION, Midland, MI (US)
Appl. No. 17/786,389
Filed by DOW SILICONES CORPORATION, Midland, MI (US)
PCT Filed Dec. 17, 2019, PCT No. PCT/CN2019/125816 § 371(c)(1), (2) Date Jun. 16, 2022, PCT Pub. No. WO2021/119972, PCT Pub. Date Jun. 24, 2021.
Prior Publication US 2023/0013216 A1, Jan. 19, 2023
Int. Cl. C08G 77/388 (2006.01); C08G 77/06 (2006.01); C08G 77/18 (2006.01); C08K 3/26 (2006.01); C09J 183/06 (2006.01)

CPC C08G 77/388 (2013.01) [C08G 77/06 (2013.01); C08G 77/18 (2013.01); C08K 3/26 (2013.01); C09J 183/06 (2013.01); C08K 2003/265 (2013.01)]

17 Claims

1. A process for preparing a chain-extended alkoxy polydiorganosiloxane from a silanol terminated polydiorganosiloxane starting material, the process:

(i) reacting the silanol terminated polydiorganosiloxane starting material with a mixture of one or more alkylacetoxydialkoxysilanes and one or more alkyldiacetoxyalkoxysilanes wherein each alkyl group may be the same or different and contains from 1 to 6 carbons and each alkoxy group may be the same or different and contains from 1 to 6 carbons; and

(ii) neutralising the resulting mixture from step (i).