Patent ID: 11939472
Assignee: DUPONT TORAY SPECIALTY MATERIALS KABUSHIKI KAISHA
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  H | IPC C

Claim 17:
18. A curable silicone composition comprising:
(A) a resinous alkenyl group-containing organopolysiloxane represented by average unit formula:

(ViMe2SiO1/2)10(Me3SiO1/2)40(SiO4/2)50;

a first linear alkenyl group-containing organopolysiloxane represented by average structural formula:

ViMe2SiO(Me2SiO)200SiMe2Vi;, and
a second linear alkenyl group-containing organopolysiloxane represented by average structural formula:

ViMe2SiO(Me2SiO)850SiMe2Vi;

(B) a linear organohydrogenpolysiloxane represented by average structural formula:

Me3SiO(HMeSiO)50SiMe3;

(C) an alkyne group-containing compound that is methyl-tris(3-methyl-1-butyn-3-oxy)silane present in an amount of from about 0.015 to about 0.1 parts by weight based on 100 parts by weight of the organopolysiloxane components; and
(D) a curing catalyst, wherein the content of the resinous alkenyl group-containing organopolysiloxane (A) is 20 mass % or more based on the total mass of the organopolysiloxanes;
wherein the composition is free of 1-ethynyl-1-cyclohexanol;
wherein the composition has a pot life of at least about 600 days measured under conditions of 25° C./50% RH; and
wherein the molar ratio (H/Vi) of the alkenyl groups and hydrogen atoms derived from the organopolysiloxanes is from about 1 to about 2.