Shin-etsu Chemical Co., Ltd.

Tatsuei Hara

Nobu Kato

Hidenori Mizushima

Shigeru Ubukata

Yoshiaki Koike

Kazuhiro Oishi

Ryo Ashida

The present invention provides an addition-curable self-adhesive silicone rubber composition and a silicone rubber cured product. An addition-curable self-adhesive silicone rubber composition which contains:

Addition-curable self-adhesive silicone rubber composition and silicone rubber cured product

The purpose of the present invention is to provide an addition-curable silicone rubber composition which gives a cured product having a controlled oil-bleeding property and releasability from a mold, without increasing an amount of a bleeding oil to be added. Thus, the present invention provides an addition-curable silicone rubber composition comprising the following components (A) to (D): wherein Ris, independently of each other, an unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, Ris, independently of each other, a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms, the amount of the monovalent aromatic hydrocarbon group is at least 35 mol % and less than 50 mol %, relative to a total amount of all substituents each bonded to a silicon atom, that is, all of Rand R, m is an integer of from 0 to 3, m' is an integer of from 0 to 3, n&#x2032; is an integer of from 0 to 3, n is an integer of from 10 to 20, and m+m&#x2032;+n+n&#x2032; is in a range of from 10 to 22.

Addition-curable silicone rubber composition

The present invention provides a silicone composition comprising components (A) to (F); (A) 100 parts by mass of a raw rubber-like, at 25 degrees C., organopolysiloxane having at least two alkenyl groups each bonded to a silicon atom; (B) 5 to 100 parts by mass of silica powder having a specific surface area of 50 m/g or more; (C) platinum or a platinum compound in an amount of 1 to 1,000 ppm by mass as a platinum atom, relative to the mass of component (A); (D) 0.01 to 5 parts by mass of a compound selected from an organic silicon compound having a nitrogen-containing organic group and an unsaturated hydrocarbon group, and benzotriazole and a derivative thereof; (E) an addition reaction curing agent other than said component (C), or an organic peroxide in an effective amount to cure the composition, and (F) 0.01 to 5 parts by mass of an aromatic hydrocarbon group-containing organopolysiloxane represented by the general formula (1) wherein a proportion of the number of the monovalent aromatic hydrocarbon group to the total number of the substituents R, Rand Ris 41% or more and less than 46%.

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Annaka, Japan

Tatsuei Hara