Shin-etsu Chemical Co., Ltd.

Kouichi Ishida

Noriyuki Koike

Shinichi Sato

Hirofumi Kishita

Takashi Matsuda

Yasushi Yamamoto

Hiroshi Inomata

Yasuo Tarumi

Kouichi Yamaguchi

Nobuyuki Kobayashi

A novel and very efficient method is disclosed for the introduction of perfluoroalkyl groups into an organopolysiloxane by utilizing the hydrosilation reaction with an organohydrogenpolysiloxane. Different from the conventional but inefficient hydrosilation reaction using a perfluoroalkyl-substituted ethylene as the olefin compound, the inventive method utilizes a propene-1 3-substituted by a perfluoroalkyl group compound as the olefin compound to react with an organohydrogenpolysiloxane by which a very high efficiency in the hydrosilation reaction can be obtained without side reactions which otherwise greatly decrease the yield of the desired perfluoroalkyl-containing organopolysiloxane product.

Method for the preparation of a fluorine-containing organopolysiloxane

An organosilicon compound represented by the general formula: ##STR1## wherein Rf represents a perfluoroalkyl group or a perfluoroalkyl ether group; R.sup.1 may be the same or different and each represent a monovalent hydrocarbon group; R.sup.2 represents an alkylene group; R.sup.3 represents a hydrogen atom or a monovalent hydrocarbon group; and a is an integer of 1 to 4, b is an integer of 1 to 3 and c is an integer of 0 to 3, provided that a, b and c satisfy the relationship of 3.ltoreq.a+b+c.ltoreq.6; is provided. These organosilicon compounds are novel compounds useful as crosslinking agents for addition-curable silicone rubber compositions.

Organosilicon compound and process for its production

A straight-chain organopolysiloxane represented by the general formula: ##STR1## wherein R.sup.1 represents a monovalent hydrocarbon group, R.sup.2 represents a bivalent organic group, Rf represents a perfluoroalkyl ether group or a perfluoroalkyl group, X represents a hydrogen atom or an organosilyl group, and n is an integer of 15 to 4,000 and having a content of cyclic polysiloxanes with a molecular weight of 3,000 or below of 50 ppm or below. This organopolysiloxane is novel in that the content of cyclic siloxanes with a molecular weight of 3,000 or below is only 50 ppm or below and the organopolysiloxane can obviate contact failure due to volatilization of components or surrounding contamination due to bleeding when used as materials in the field of electricity and electronics or as building materials.

Organopolysiloxane

Growing community of inventors

Gunma, Japan

Kouichi Ishida