US 12,454,616 B2
Room temperature vulcanisable silicone compositions
Aaron Seitz, Midland, MI (US); Milton H. Repollet-Pedrosa, Midland, MI (US); Rochelle Nesbitt, Midland, MI (US); and Glenn Gordon, Midland, MI (US)
Assigned to DOW SILICONES CORPORATION, Midland, MI (US)
Appl. No. 17/621,650
Filed by DOW SILICONES CORPORATION, Midland, MI (US)
PCT Filed Jun. 23, 2020, PCT No. PCT/US2020/039035
§ 371(c)(1), (2) Date Dec. 21, 2021,
PCT Pub. No. WO2020/263763, PCT Pub. Date Dec. 30, 2020.
Claims priority of provisional application 62/867,494, filed on Jun. 27, 2019.
Prior Publication US 2022/0356353 A1, Nov. 10, 2022
Int. Cl. C08L 83/06 (2006.01); C09D 5/18 (2006.01); C09D 7/62 (2018.01); C09D 183/06 (2006.01); C09J 5/00 (2006.01); C09J 11/04 (2006.01); C09J 183/06 (2006.01); D06N 3/12 (2006.01); E04B 1/68 (2006.01); E04B 1/94 (2006.01); E04D 7/00 (2006.01)
CPC C08L 83/06 (2013.01) [C09D 5/185 (2013.01); C09D 7/62 (2018.01); C09D 183/06 (2013.01); C09J 5/00 (2013.01); C09J 11/04 (2013.01); C09J 183/06 (2013.01); D06N 3/128 (2013.01); E04B 1/6801 (2013.01); E04B 1/947 (2013.01); E04D 7/00 (2013.01); C08L 2205/025 (2013.01); C08L 2312/08 (2013.01); C09J 2483/00 (2013.01)] 17 Claims
 
1. A silicone elastomer composition which is storage stable, and capable of cure to an elastomeric body, the composition comprising:
(i) an organopolysiloxane polymer having at least two hydroxyl or hydrolysable groups per molecule and of the general formula
X3-nRnSi—(Z)—(R1ySiO(4-y)/2)z—(SiR12—Z)—Si—RnX3-n
in which each X is an alkoxy group, each R is an alkyl, alkenyl or aryl group, each R1 is an X group, alkyl group, alkenyl group or aryl group, and Z is a divalent organic group; and n is 0 or 1, y is 0, 1 or 2, and z is an integer such that the organopolysiloxane polymer (i) has a viscosity of from 1,000 to 75,000 mPa·s at 25° C.;
(ii) a siloxane and/or silane cross-linker having at least three groups per molecule which are reactable with the hydroxyl or hydrolysable groups in the organopolysiloxane polymer (i);
(iii) a solid organosilicate resin which is a product of a reaction of an organosilicate resin precursor with a treating agent such that the solid organosilicate resin is substantially unreactive with components (i) and (ii) and comprising R23SiO1/2 siloxane units and SiO4/2 siloxane units, wherein the molar ratio of the R23SiO1/2 siloxane units to SiO4/2 siloxane units is from 0.5:1 to 1.2:1, and R2 is selected from hydrocarbon groups; the solid organosilicate resin (iii) having a weight average molecular weight of from 3,000 to 30,000 g/mol; and optionally
(iv) a suitable condensation cure catalyst; and
wherein the solid organosilicate resin (iii) comprises vinyl functional groups.