Shin-etsu Chemical Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Yazaki Corporation

Shin-etsu Handotai Co., Ltd.

Mitsubishi Engineering-plastics Corporation

Shin-etsu Chemical C O., Ltd.

Mitsubishi Engineering Plastics Co., Ltd.

Shigeki Shudo

Hironao Fujiki

Akira Matsuda

Nobu Kato

Shigeru Ubukata

Hidenori Mizushima

Noboru Shimamoto

Takashi Kondou

Nobumasa Tomizawa

Naoto Obayashi

Shigeru Muramatsu

Hiroshi Hashimoto

Masayuki Ikeno

Yasushi Yamamoto

Noriyuki Meguriya

Takeo Yoshida

Hiroyasu Hara

Noriyoshi Ogawa

Masahiro Kanda

Hiromasa Hashimoto

Chisato Kato

Osamu Hayashida

Fumio Suzuki

Naoki Yamakawa

Takeshi Miyao

Toshiaki Takata

Masanobu Miyakoshi

Kazutaka Iizuka

Takashi Aketa

Toshiaki Takahashi

Yujiro Taira

Hironobu Muramatsu

Mikio Iino

Kohichi Tanaka

Ryo Ashida

Yuji Fujita

Eiji Kuchiki

Manabu Narumi

An addition-curable liquid silicone rubber composition for LED headlamps, which contains:

Addition-curable liquid silicone rubber composition for LED headlamps, and LED headlamp

The present invention provides a transparent liquid silicone rubber composition that does not contain an inorganic filler and includes the following as main components: (A) a silicone resin having, as essential structural units, an RSiOunit (M unit) and a SiOunit (Q unit) (R is a monovalent hydrocarbon group containing 1-6 carbon atoms, and at least 2 R's in a molecule are alkenyl groups); (B) a straight-chain or branched organopolysiloxane containing, in a molecule, 2 or more alkenyl groups bonded to silicon atoms; (C) an organohydrogenpolysiloxane containing, in a molecule, 2 or more hydrogen atoms bonded to silicon atoms; (D) an organopolysiloxane which is liquid at room temperature, having a weight-average molecular weight of 37,000 or less and containing, in a molecule, one or more hydroxyl groups bonded to silicon atoms; and (E) a hydrosilylation reaction catalyst. The present invention is a highly transparent, hydrosilylation-curable liquid silicone rubber composition, wherein the hardness and high transparency are sufficiently retained and the mold releasability is excellent.

Transparent liquid silicone rubber composition

An addition-curable silicone rubber composition which contains: 100 parts by weight of (A) an organopolysiloxane that is represented by average composition formula (1) RSiO(wherein Rrepresent monovalent hydrocarbon groups that are the same as or different from each other, and a represents a positive number of 1.5-2.8) and has at least two alkenyl groups, each of which is bonded to a silicon atom, in each molecule; 0.3-20 parts by weight of (B) an organohydrogen polysiloxane that has at least two hydrogen atoms (SiH functional groups), each of which is bonded to a silicon atom, in each molecule; 5-80 parts by weight of (C) a reinforcing silica; and (D) an addition reaction catalyst, which is configured of a platinum group metal, in an amount of 0.5-1,000 ppm relative to the total weight of the components (A) and (B). This addition-curable silicone rubber composition also contains (E) an organopolysiloxane, which has one or more Si&#x2014;OH functional groups in each molecule, while having a polymerization degree of 10 or less, in an amount of 0.005-0.3% by weight relative to the total weight of the composition.

Addition-curable silicone rubber composition and silicone rubber

Provided is an addition-curable silicone rubber composition that contains (A) an alkenyl group-containing organopolysiloxane, (B) an organohydrogenpolysiloxane, (C) a platinum catalyst and (D) a reinforcement filler material surface treated with a benzotriazole derivative represented by formula (I) (in the formula, Ris a hydrogen atom or a monovalent hydrocarbon group and Ris a monovalent organic group) and that is capable of lowering the compression set of a cured article and suppressing changes in hardness after heat degradation characteristic testing while suppressing reduced curability. Also provided are a cured article thereof and a manufacturing method for the addition-curable silicone rubber composition.

Addition-curable silicone rubber composition and cured product

Provided is an addition-curable liquid silicone rubber composition which is suppressed in thickening over time even in cases where a silicone raw rubber is added into a liquid silicone rubber composition, thereby having excellent storage stability, and which provides a silicone rubber that has a low hardness after being cured. An addition-curable liquid silicone rubber composition which contains: (A) an alkenyl group-containing organopolysiloxane having an average polymerization degree of 1,500 or less, which is in a liquid state at room temperature; (B) an organopolysiloxane having an average polymerization degree of 2,000 or more, which is in the form of a raw rubber at room temperature; (C) an organohydrogen polysiloxane; (D) a fumed silica having a BET specific surface area of 130 m/g or more; (E) an organosilane and/or organopolysiloxane having a silanol group; and (F) an addition reaction catalyst. This addition-curable liquid silicone rubber composition provides a low-hardness silicone rubber which has a hardness (durometer A) of 5-40 after being cured.

Addition-curable liquid silicone rubber composition

An addition curable liquid silicone rubber composition for injection molding is provided. The composition comprises (A) an organopolysiloxane containing at least two Si-bonded alkenyl groups within each molecule, (B) an organohydrogenpolysiloxane containing at least two Si-bonded hydrogen atoms within each molecule, (C) a fumed silica with a BET specific surface area of 50 m/g or greater, and (D) an addition reaction catalyst, and exhibiting fluidity such that, at 23&#xb0; C., the viscosity at a shear velocity of 0.9 sis not higher than 1,000 Pa&#xb7;s, and the ratio between the viscosity at a shear velocity of 100 sand the viscosity at a shear velocity of 200 sis not higher than 3.5. The composition is resistant to decreases in viscosity of the rubber material under high shear velocity, and generates no burrs on the molded product.

Addition curable liquid silicone rubber composition for injection molding, method of regulating fluidity of the composition, and method of injection molding silicone rubber composition

An adhesive silicone rubber composition comprising (A) 100 pbw of an organopolysiloxane containing at least two silicon-bonded alkenyl radicals, (B) 0.5-20 pbw of an organohydrogenpolysiloxane containing at least two Si&#x2014;H radicals, (C) a hydrosilylation catalyst, and (D) 0.1-50 pbw of an organosilicon compound having at least one phenyl structure, at least one alicyclic epoxy radical, and at least one Si&#x2014;H radical is applicable to an electrolyte membrane and a separator in a polymer electrolyte fuel cell to form a firm integrally molded part.

Adhesive silicone rubber composition and separator seal material for fuel cells

An addition reaction-curable liquid silicone rubber composition includes an organopolysiloxane containing at least one Si-bonded vinyl group only at each end of its backbone and having a viscosity of from 1 to 1,000 Pa&#xb7;s at 25&#xb0; C., an organopolysiloxane containing at least two Si-bonded vinyl groups only in side chains on its backbone and having a viscosity of from 0.1 to 100 Pa&#xb7;s at 25&#xb0; C., the amount of siloxane units bonded to the vinyl groups being from 2 to 20 mole % of its total siloxane units, finely divided silica having a specific surface area of at least 50 m/g, hexamethyldisilazane, water, an organohydrogenpolysiloxane containing at least two Si-bonded hydrogen atoms per molecule, and a hydrosilation catalyst. Another addition reaction-curable liquid silicone rubber composition additionally includes a specific non-functional dimethylpolysiloxane. The silicone rubber compositions are cured into products having a hardness of at least 75 as measured by a type-A durometer and an elongation at break of at least 200%.

Addition reaction-curable liquid silicone rubber compositions and process of preparing same

A liquid form addition curable silicone rubber composition for forming a fluororesin covered fixing roller is provided. This composition includes (a) 100 parts by weight of an organopolysiloxane with at least two alkenyl groups bonded to non-terminal silicon atoms; (b) an organohydrogenpolysiloxane with at least two silicon-bonded hydrogen atoms, in a sufficient quantity to produce a molar ratio of silicon-bonded hydrogen atoms within said constituent (b) relative to silicon-bonded alkenyl groups within said constituent (a) of 0.4 to 5.0; (c) an effective quantity of a platinum based catalyst; (d) 0.1 to 10 parts by weight of dry process silica; and (e) 0.05 to 5 parts by weight of a cyclic diorganopolysiloxane with at least three silicon-bonded alkenyl groups. This composition is used for formation of the silicone rubber layer of a fixing roller made up of a metal core, a silicone rubber layer on the core, and a fluorine based coating provided on the rubber layer. Good adhesion is obtained between the silicone rubber layer and both of the metal core and the fluorine-based coating, and as a result excellent durability is achieved.

Liquid form addition curing type silicone rubber composition for fluororesin covered fixing roller and fluororesin covered fixing roller

Liquid form addition curing type silicone rubber composition for roll forming

A fixing roller purpose liquid addition-curable silicone rubber composition including (A) 100 parts by weight of an organopolysiloxane having in one molecule at least two alkenyl groups bonded to silicon atoms; (B) from 1 part by weight to 30 parts by weight of an organopolysiloxane having hydroxyl groups at both terminals of the molecular chain; (C) an organohydrogenpolysiloxane having in one molecule at least two hydrogen atoms bonded to silicon atoms; and (D) a platinum group metal compound in a catalytically effective quantity. The SiH groups in the component (C) is present in an amount of from 0.4 to 5.0 equivalent weight per one alkenyl group in the component (A). This composition is a substantially non-foamable and addition-curable liquid silicone rubber composition, which is therefore suitable for the fixing roller purpose. The composition has a good moldability to a mandrel and enables production of a fixing roller with a silicone rubber layer having superior toner releasability and mechanical strength.

Liquid addition-curable silicone rubber composition for fixing roller purpose, and fixing roller

A heat-fixing silicone rubber roller comprising a roller shaft, a silicone rubber layer provided on the outer periphery of the roller shaft, and at least one of a fluorine resin layer and a fluorine rubber layer, provided on the outer periphery of the silicone rubber layer. The silicone rubber layer comprises a cured product of a silicone rubber composition containing at least (A) an organopolysiloxane with an average molecular weight of from 30,000 to 100,000, having in one molecule at least two alkenyl groups bonded to silicon atoms; (B) an organohydrogenpolysiloxane having in one molecule at least two hydrogen atoms bonded to silicon atoms; the hydrogen atoms bonded to silicon atoms being in the weight that is from 0.1 to 3.0 equivalent weight per one alkenyl group in the component (A); and (C) a platinum group metal catalyst. The heat-fixing silicone rubber roller has a coating layer of fluorine resin and/or fluorine rubber excellent in interlaminar adhesion and durability.

Heat-fixing silicone rubber roller

A silicone rubber layer is formed on a metal mandrel by curing an addition reaction curing type liquid silicone rubber composition so as to provide a resilience of 5-30% according to JIS K-6301, and an organic resin layer having a low surface energy is provided thereon, thereby yielding a low-hardness silicone rubber fixing roll, which ensures an appropriate nip width even under a low nip pressure and even when the silicone rubber layer is made thin.

Low-hardness silicone rubber fixing rolls

A heat fixing roll includes a silicone rubber layer on a cylindrical metal mandrel having a penetration of at least 10 according to ASTM D1403 and a fluoroplastic layer thereon. The silicone rubber layer is obtained by molding and curing an addition reaction type liquid silicone rubber composition to the mandrel. The roll provides a sufficient nip width under low pressure, improved abrasion resistance, long-lasting toner release, and a satisfactory fixing function even at a high speed over a long period of time.

Heat fixing rolls

An integrally molded automotive waterproof connector is disclosed which comprises a thermoplastic resin and integrated therewith an oil-bleeding silicone rubber, the thermoplastic resin containing a thermoplastic resin oligomer containing at least one aliphatic unsaturated group. In the connector, the adhesion between the thermoplastic resin and the silicone rubber is satisfactory regardless of the length of storage period as compared with connectors comprising a thermoplastic resin and a silicone rubber integrated therewith after priming. Further, the connector of the present invention is excellent in production efficiency and workability, is reduced in connector housing fitting force, and can retain satisfactory waterproofness.

Integrally molded automotive waterproof connector comprising

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Annaka, Japan

Shigeki Shudo