US 12,454,617 B2
Silicone elastomer compositions
Elizabeth M. Santos, Midland, MI (US); Eric Joffre, Midland, MI (US); Scott D. Boelter, Midland, MI (US); Nanguo Liu, Midland, MI (US); and Xiaoyuan Zhou, Midland, MI (US)
Assigned to DOW SILICONES CORPORATION, Midland, MI (US)
Appl. No. 18/012,193
Filed by DOW SILICONES CORPORATION, Midland, MI (US)
PCT Filed Jun. 23, 2021, PCT No. PCT/US2021/038654
§ 371(c)(1), (2) Date Dec. 21, 2022,
PCT Pub. No. WO2021/262832, PCT Pub. Date Dec. 30, 2021.
Claims priority of provisional application 63/043,367, filed on Jun. 24, 2020.
Prior Publication US 2023/0265290 A1, Aug. 24, 2023
Int. Cl. C08L 83/06 (2006.01); C08G 77/08 (2006.01); C08J 7/04 (2020.01); C08J 7/18 (2006.01); C08K 3/013 (2018.01); C08K 5/14 (2006.01)
CPC C08L 83/06 (2013.01) [C08G 77/08 (2013.01); C08J 7/0427 (2020.01); C08J 7/18 (2013.01); C08K 3/013 (2018.01); C08K 5/14 (2013.01); C08J 2383/06 (2013.01); C08J 2469/00 (2013.01); C08L 2205/025 (2013.01)] 14 Claims
 
1. A curable silicone elastomer composition that can achieve adhesion on plastic/thermoplastic/resin material substrates, the curable silicone elastomer composition comprising:
(A) one or more organopolysiloxanes containing at least two alkenyl and/or alkynyl groups per molecule and having a viscosity in a range of 1,000 to 500,000 mPa's at 25° C.;
(B) a curing agent comprising
(B)(i) an organic peroxide radical initiator; or
(B)(ii) a hydrosilylation cure catalyst package comprising a hydrosilylation catalyst and an organosilicon compound having at least two, optionally at least three, Si—H groups per molecule;
(C) at least one reinforcing filler and optionally one or more non-reinforcing fillers; and
(D) an organopolysiloxane based additive of the following formula
D-O—[Y]-D
in which each D group is a cyclic siloxane of the structure
[(O—Si(−)R3)(OSiR3H)m(OSiR3X)a]
wherein each R3 group is an alkyl group containing from 1 to 6 carbons and each X is an epoxide containing group in which m is an integer of at least 1 and a is an integer of at least 1; and
[Y] is a linear siloxane group of the structure
SiPhR3O]n or [SiPh2O]n
wherein Ph is a phenyl group and n is an integer of from 2 to 20.