Shin-etsu Chemical Co., Ltd.

Ricoh Company, Ltd.

Nagaoka Co., Ltd.

Kiyoshi Imai

Kunio Itoh

Takeshi Fukuda

Masaki Tanaka

Susumu Ueno

Tsutomu Nakamura

Yasuo Asahina

Takeo Yoshida

Motoo Fukushima

Setsuo Soga

Kimitaka Kumagae

Masanobu Miyakoshi

Hirokazu Kawabe

Ichiro Fukushima

Nobuyuki Hasebe

Yoshimi Ogushi

Nobuyuki Uesugi

Niichiro Suzuki

Nobuhiro Ohta

Tomiaki Asami

A silicone rubber composition composed of a high-molecular diorganopolysiloxane, a reinforcing silica filler and an organic peroxide as a curing agent is further compounded with a fluorine-containing low-polymeric compound such as poly(chlorotrifluoroethylene) and perfluorinated polyether compound of the formula F--[--CF(CF.sub.3)--CF.sub.2 --O--].sub.v --O--CF.sub.2 --CF.sub.3, in which v is 2 to 100, as well as fluoroalkyl-substituted organopolysiloxanes. The silicone rubber composition can give a cured silicone rubber product having greatly improved resistance against dynamic fatigue as in repeated cycles of stretching and relaxation.

Silicone rubber composition

The silicone rubber composition comprises, in addition to the conventional ingredients of a high-polymeric diorganopolysiloxane and a reinforcing silica filler, a specific phosphorus-containing organic compound, such as phosphinates, phosphonates and phosphates, in a limited amount. By virtue of this unique ingredient, the composition can give a cured silicone rubber product having greatly improved resistance against dynamic fatigue.

Silicone rubber composition resistant against dynamic fatigue

A flame-retardant silicone rubber composition is prepared by admixing a base compound of a dimethylpolysiloxane gum and a siliceous filler with a combination of a platinum compound and an organosilicon compound having at least one nitrogen-containing organic group and at least one aliphatically unsaturated group in a molecule in such a proportion that the molar ratio of nitrogen to platinum is within a specified range. The effect of flame retardancy exhibited by the composition is so reliable and constant that the effect can be obtained regardless of the type of the peroxide curing agent and the curing behavior of the composition is never affected by the formulation of the flame retardant agent.

Flame-retardant silicone rubber composition

A rubber composition useful for shaping a vibration-damping rubber article is formulated with a synthetic rubber, which is preferably an organopolysiloxane gum, a finely divided silica filler having a specific surface area of at least 50 m.sup.2 / g and a specific .alpha.,.omega.-dihydroxy diorganopolysiloxane expressed, for example, by HO--SiMePh--O.sub.m H, in which Me is a methyl group, Ph is a phenyl group and m is a positive integer of 2-20.

Vibration-damping rubber composition

The invention provides a flexible metal-foiled laminate of an insulating base film of a synthetic resin, e.g. polyimide, and a metal, e.g. copper, foil adhesively bonded together and suitable for use as a base plate for printed circuit boards by virtue of the high heat resistance and greatly increased adhesive bonding strength between the base film and the metal foil. The laminate is prepared by use of a silicone-based adhesive and the surface of the base film is, prior to adhesive bonding, subjected to a treatment of exposure to an atmosphere of low temperature plasma generated in a gaseous organosilicon compound such as trimethyl ethoxy silane, optionally, diluted with an inorganic gas such as oxygen.

Heat-resistant flexible laminate for substrate of printed circuit board

The present invention presents a novel curable organopolysiloxane composition capable of being adhesively bonded firmly to the surface of various substrates with which it has been in contact during its curing by heating without the primer treatment of the surface. The composition is essentially composed of a diorganopolysiloxane terminated at both chain ends with vinyl groups as the base component, optionally, in combination of a copolymeric organopolysiloxane composed of vinyl-containing monofunctional siloxane units and tetrafunctional siloxane units SiO.sub.2, an organohydrogen-polysiloxane having at least three silicon-bonded hydrogen atoms per molecule as a crosslinking agent by the addition reaction with the vinyl groups in the base component, a platinum catalyst to accelerate the above addition reaction and an alkoxy silane having an aliphatically unsaturated group which serves as a 'self-bonding' improver in the composition with or without the addition of a filler.

Curable organopolysiloxane compositions

The curable composition provided by the present invention comprises a butadiene polymer having organosilicon groups as the pendant groups, an ethylenically unsaturated polymerizable compound, an organic peroxide, and optionally a filler. The butadiene polymer being the base of this composition can readily be obtained by the platinum-catalyzed addition reaction between an organosilicon compound having a hydrogen atom directly bonded to the silicon atom in a molecule and the ethylenic unsaturation of a conventional butadiene polymer. The compositions of the invention are remarkably superior in many respects to those composition based on ordinary butadiene polymers, and useful for applications in a wide variety including the production of electrically insulating materials and various kinds of industrial articles.

Curable compositions based on silicon-containing butadiene polymers

The Gramophone record cleaner proposed is of the roller type having a sticky surface formed of a rubbery organopolysiloxane elastomer having a relatively low hardness and adapted to pick up dirt or dust and other contaminants from within the grooves of a record as the roller is passed over the record surface. The roller-type cleaners are superior in their easy performance of complete dirt removal in repeated operations, since the sticky surface of the roller once choked with contaminants can be cleaned simply by rinsing with water.

Roller for cleaning phonograph records

A fixing roll for electrophotography having a surface layer of a cured room-temperature-vulcanizing silicone rubber composition comprising a mixture consisting of two diorganopolysiloxanes, one of which is terminated at the chain ends with silanol groups and has a relatively high viscosity, and the other of which is terminated at the chain ends with trialkyl silyl groups and has a relatively low viscosity, an alkoxysilane or a partial hydrolysis-condensate thereof as the crosslinking agent, a metal salt of an organic acid as the reaction catalyst, and three kinds of inorganic fillers, namely, calcium carbonate, iron oxide, and titanium dioxide, and containing substantially no siliceous fillers. The fixing rolls have excellent properties including, in particular, the ability to provide a long copy-life to electrophotographic copying machines.

Growing community of inventors

Annaka, Japan

Kiyoshi Imai