	US 12,473,431 B2
	Silicone compositions and their applications
Lei Fang, Shanghai (CN); and Frederic Gubbels, Seneffe (BE)
Assigned to DOW SILICONES CORPORATION, Midland, MI (US)
Appl. No. 17/767,898
Filed by DOW SILICONES CORPORATION, Midland, MI (US)
PCT Filed Oct. 22, 2020, PCT No. PCT/CN2020/122693 § 371(c)(1), (2) Date Apr. 10, 2022, PCT Pub. No. WO2021/068977, PCT Pub. Date Apr. 15, 2021.
Claims priority of application No. PCT/CN2019/110567 (WO), filed on Oct. 11, 2019.
Prior Publication US 2023/0102289 A1, Mar. 30, 2023
Int. Cl. C08L 83/06 (2006.01); C08G 77/18 (2006.01); C08J 3/075 (2006.01); C08K 3/22 (2006.01)

CPC C08L 83/06 (2013.01) [C08G 77/18 (2013.01); C08J 3/075 (2013.01); C08K 3/22 (2013.01); C08J 2383/06 (2013.01); C08K 2003/2227 (2013.01); C08K 2201/001 (2013.01); C08L 2203/206 (2013.01); C08L 2312/08 (2013.01)]

18 Claims

1. A multiple part condensation curable gel composition comprising:

(i) at least one condensation curable silyl terminated polymer having at least two hydroxyl functional groups per molecule and a viscosity<1000 mPas at 25° C.;

(ii) a cross-linker selected from silyl functional molecules having at least two silyl groups, each silyl group containing at least two hydrolysable groups, and having a viscosity≤1000 mPas at 25° C., provided such viscosity is at least 75% of the viscosity of polymer (i);

(iii) a condensation catalyst selected from the group consisting of titanates, zirconates, and combinations thereof; and

(iv) one or more reinforcing and/or non-reinforcing filler(s);

wherein:

(a) catalyst (iii) and filler(s) (iv) are not stored together before cure of the composition;

(b) the ratio of Si—OH groups:Si-hydrolysable groups in the composition is from 0.4:1 to 0.95:1; and