公开(公告)号：US20170283614A1

公开(公告)日：2017-10-05

申请号：US15624087

申请日：2017-06-15

Applicant: MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC

Inventor： Kikuo MOCHIZUKI ,  Hidefumi TAGAI ,  Masanari SHIMAKAWA ,  Kazuki SHINBO

IPC: C08L83/04 ,  F21V3/04 ,  G02B1/04 ,  B29C45/00 ,  B29C43/00

Abstract: A polyorganosiloxane composition for molding includes: (A) a straight-chain polyorganosiloxane having two or more alkenyl groups and having a viscosity (25° C.) of 10,000 to 500,000 mPa·s; (B) 30 to 80 mass % of a resinoid polyorganosiloxane including M, D, and Q units, at a molar ratio of a:b:c, on average (0.3≦a≦0.6, 0≦b≦0.1, 0.4≦c≦0.7, and a+b+c=1), and having two or more alkenyl groups; (C) an amount of a polyorganohydrogensiloxane having Si-bonded hydrogen atoms, an average degree of polymerization of 10 or more, a content of the Si-bonded hydrogen atoms of 5.0 mmol/g or more and 11.0 mmol/g or less, and a mass decrease rate up to 140° C. by TGA of 2.0 mass % or less so that an amount of the (Si-bonded hydrogen atoms/alkenyl groups) is 1.0 to 3.0 mol; and (D) a hydrosilylation reaction catalyst. A cured product excellent in mold release property is obtained and contamination of a metal mold is prevented.