US 11,814,521 B2
Thermally conductive polyorganosiloxane composition
Atsushi Sakamoto, Tokyo (JP); and Isao Iida, Tokyo (JP)
Assigned to MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC, Tokyo (JP)
Filed by MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC, Tokyo (JP)
Filed on Jun. 24, 2021, as Appl. No. 17/357,690.
Application 17/357,690 is a continuation of application No. 16/618,077, abandoned, previously published as PCT/JP2018/020986, filed on May 31, 2018.
Claims priority of application No. 2017-107606 (JP), filed on May 31, 2017.
Prior Publication US 2021/0317313 A1, Oct. 14, 2021
Int. Cl. C08L 83/04 (2006.01); C08K 3/28 (2006.01); C08K 3/013 (2018.01); C08L 83/06 (2006.01); C08G 77/12 (2006.01); C08G 77/20 (2006.01)
CPC C08L 83/04 (2013.01) [C08K 3/013 (2018.01); C08K 3/28 (2013.01); C08L 83/06 (2013.01); C08G 77/12 (2013.01); C08G 77/20 (2013.01); C08K 2003/282 (2013.01); C08K 2201/001 (2013.01); C08K 2201/003 (2013.01); C08L 2203/206 (2013.01)] 5 Claims
 
1. A thermally conductive polysiloxane composition comprising:
(A) a thermally conductive filler;
(B) a mixture of:
(i) a polyorganosiloxane containing one curable group, the polyorganosiloxane containing one curable group being represented by the following formula (1):

OG Complex Work Unit Chemistry
wherein Ra is the curable group, each R is independently a C1-6 alkyl group or a C6-12 aryl group, and n is an integer of 20 to 50, and
(ii) a polyorganosiloxane containing more than one curable group,
wherein a content of the (i) polyorganosiloxane containing one curable group in the mixture (B) is more than 80% by mass;
(C) a siloxane compound represented by the following formula (3):

OG Complex Work Unit Chemistry
wherein:
R1 is a group having an alkoxysilyl group having 1 to 4 carbon atoms;
R2 is a linear organosiloxy group represented by the following formula (4):

OG Complex Work Unit Chemistry
each R4 is independently a monovalent hydrocarbon group having 1 to 12 carbon atoms;
Y is a group selected from the group consisting of methyl, vinyl, and R1,
d is an integer of 2 to 60;
each X is independently a divalent hydrocarbon group having 2 to 10 carbon atoms;
each of a and b is independently an integer of 1 or more;
c is an integer of 0 or more;
a+b+c is an integer of 4 or more; and
each R3 is independently a monovalent hydrocarbon group having 1 to 6 carbon atoms or a hydrogen atom;
(D) a hydrogenpolyorganosiloxane; and
(E) a platinum catalyst.