US 11,945,981 B1
Adhesion of silicone rubber to thermoplastics
Florian Geyer, Wiesbaden (DE); and Michael Backer, Wiesbaden (DE)
Assigned to DOW SILICONES CORPORATION, Midland, MI (US)
Appl. No. 18/283,383
Filed by DOW SILICONES CORPORATION, Midland, MI (US)
PCT Filed Mar. 29, 2022, PCT No. PCT/US2022/022245
§ 371(c)(1), (2) Date Sep. 21, 2023,
PCT Pub. No. WO2022/212304, PCT Pub. Date Oct. 6, 2022.
Claims priority of provisional application 63/167,743, filed on Mar. 30, 2021.
Int. Cl. C09J 183/04 (2006.01); B32B 27/28 (2006.01); B32B 27/32 (2006.01); B32B 37/12 (2006.01); C08G 77/08 (2006.01); C08G 77/18 (2006.01)
CPC C09J 183/04 (2013.01) [B32B 27/283 (2013.01); B32B 27/32 (2013.01); B32B 37/1284 (2013.01); C08G 77/08 (2013.01); C08G 77/18 (2013.01); B32B 2037/1253 (2013.01)] 15 Claims
 
1. An adhesion mediator composition comprising:
(i) a trialkoxysilane, of the formula Si(OR)3R1, wherein each R may be the same or different and is an alkyl group having at least two carbons per group and each R1 may be the same or different and is an unsaturated group selected from an alkenyl group or an alkynyl group; which trialkoxysilane is present in an amount of from 20 to 45 wt. % of the composition;
(ii) a platinum group metal based hydrosilylation reaction catalyst;
(iii) an alkoxy titanium compound having from 2 to 4 alkoxy groups in an amount of from 1 to 10 wt. %;
(iv) a tetraalkoxysilane, of the formula Si(OR2)4, wherein each R2 may be the same or different and is an alkyl group having at least two carbons per group, which tetraalkoxysilane is present in an amount of from 5 to 20 wt. % of the composition; and
(v) either
(a′) a polyorganosiloxane containing at least two unsaturated groups, selected from alkenyl groups and alkynyl groups, per molecule, and having a viscosity in a range of 50 mPa·s to 9000 mPa·s using a Brookfield viscometer with an RV-4 spindle at 20 rpm at 25° C.; or
(b′) a mixture of two or more polyorganosiloxanes containing at least two unsaturated groups, selected from alkenyl groups and alkynyl groups, per molecule, which mixture has a viscosity in a range of 50 mPa·s to 9000 mPa·s using a Brookfield viscometer with an RV-4 spindle at 20 rpm at 25° C.;
wherein component (v) is present in an amount of from 25 to 60 wt. % of the composition.