Patent ID: 9688851
Date: 2017-06-27
CPC Classifications: C08G,C08K,C08L,H01L

Claim:
1. A polysiloxane composition, comprising: (A) a modified polyhedral polysiloxane which is obtained by modifying (a) an alkenyl group-containing polyhedral polysiloxane compound with (b) a hydrosilyl group-containing compound; (B) an organopolysiloxane that contains at least two alkenyl groups in a molecule; and the polysiloxane composition further comprises (C) a component which is (C1) an organosilicon compound that contains only one alkenyl or hydrosilyl group and at least one aryl group in a molecule, or (C2) a cyclic olefin compound that contains only one carbon-carbon double bond in a molecule, wherein the polysiloxane composition after curing has a water vapor permeability of not more than 30 g/m wherein a loss tangent peak of a cured article of the polysiloxane composition is in a range of −5° C. to 23° C.