Shin-etsu Chemical Co., Ltd.

Miyuki Tanaka

Kazuyasu Sato

Masayuki Ikeno

Hironao Fujiki

Shinichi Sato

Hiroshi Inomata

Hiroyasu Hara

Tsuyoshi Matsuda

A curable silicone gel composition that is of low viscosity, exhibits good fluidity, and generates a silicone gel that exhibits good resistance to external stress and thermal stress. The composition includes (A) a specific organopolysiloxane having at least two alkenyl groups within each molecule, (B) an organohydrogenpolysiloxane having a specific branched main chain structure, containing at least three SiH groups within each molecule, and also containing at least one branch-forming unit within each molecule, and (C) a platinum-based catalyst, wherein the cured product has a penetration value of 10 to 200, and loss coefficient values at 25&#xb0; C. for shear frequency values of 1 Hz and 10 Hz of 0.1 to 1.0 and 0.3 to 1.5 respectively.

Curable silicone gel composition

The invention provides a silicone gel composition comprising:

Silicone gel composition that yields cured product having displacement durability

Provided is a silicone gel composition including (A) an organopolysiloxane containing at least one alkenyl group bonded to a silicon atom within each molecule, represented by an average composition formula: RRSiO(wherein, each R group represents, independently, an alkenyl group, each Rgroup represents, independently, an unsubstituted or substituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, a represents a positive number from 0.0001 to 0.2, b represents a positive number from 1.7 to 2.2, and a+b represents a number within a range from 1.9 to 2.4), (B) an organohydrogenpolysiloxane containing at least two hydrogen atoms bonded to silicon atoms within each molecule, and (C) a platinum-based catalyst. Also provided is the silicone gel composition stated above, in which a penetration value of a cured product of this composition, as defined in JIS K2220, is within a range from 20 to 200. The silicone gel composition generates a silicone gel cured product which displays a low elastic modulus and low stress, and suffers no oil bleeding over time.

Silicone gel composition

A curable organopolysiloxane composition is provided, which includes (A) an organopolysiloxane containing at least one silicon atom-bonded alkenyl group within each molecule, (B) an organohydrogenpolysiloxane, which contains, within each molecule, at least one silicon atom-bonded hydrogen atom at a molecular chain terminal, and at least two silicon atom-bonded hydrogen atoms at non-terminal positions within the molecular chain, and which satisfies the formula shown below:0&#x3c;&#x3b1;/&#x3b2;0.25(wherein, &#x3b1; represents the number of silicon atom-bonded hydrogen atoms at non-terminal positions within the molecular chain, and &#x3b2; represents the total number of silicon atoms within the component (B)), in sufficient quantity to provide from 0.1 to 5 silicon atom-bonded hydrogen atoms per silicon atom-bonded alkenyl group within the component (A), and (C) a platinum-based catalyst. The composition can be cured even at low temperatures, generates a cured product that suffers no surface wrinkling, and displays excellent storage characteristics.

Curable organopolysiloxane composition

In a one part organopolysiloxane gel composition comprising an alkenyl-containing branched organopolysiloxane, an SiH-termined organohydrogenpolysiloxane, and an addition reaction catalyst, the catalyst is obtained by heat aging a mixing of a platinum complex having an alkenyl-containing silane or organosiloxane as a ligand, a phosphite, and an organohydrogenpolysiloxane at 30-120&#xb0; C. and an organic peroxide is concomitantly used. The composition inhibits addition reaction at room temperature, maintains storage stability over a long period, yet can cure rapidly at moderate temperature.

One part organopolysiloxane gel composition

A silicone composition comprising (A) an organopolysiloxane having at least one lower alkenyl group in a molecule, (B) an organohydrogenpolysiloxane having at least two SiH groups in a molecule, (C) a platinum catalyst, and (D) at least one compound selected from among indoline, 1,2,3-triazole, 1,2,4-triazole, imidazole, indazole, benzoxazole, 2-hydroxybenzoxazole, 5-benzyloxyindole, 1,2-benzisoxazole, 2,1-benzisoxazole, and 1,3-benzodioxole cures effectively into a transparent rubbery or gel product having flame retardance.

Flame retardant silicone compositions

A one-part polysiloxane composition comprising a branched organopolysiloxane with vinyl groups bonded to silicon atoms, an organohydrogenpolysiloxane with at least two hydrogen atoms bonded to molecular chain terminal silicon atoms within each molecule, and a platinum based catalyst, together with an additional phosphite triester and an organic peroxide, is resistant to increases in viscosity, and does not gel, even on extended storage at room temperature. Even after storage, the characteristics of the cured gel product are unchanged. Accordingly, a composition of the present invention offers excellent long term storage stability at room temperature.

One-part organopolysiloxane gel composition

A material in the form of polyamide fibers, polyester fibers, woven and non--woven fabric thereof, thermoplastic elastomer, and polyurethane sheet is coated with a silicone coating composition to a thickness of 5 to 20 .mu.m, obtaining a silicone coated base material. The silicone coating composition contains (A) an organopolysiloxane having at least two alkenyl groups, (B) an organohydrogenpolysiloxane having at least two hydrogen atoms, (C) an organic silicon compound having at least one hydrogen atom and at least one epoxy and/or trialkoxy-silyl group, (D) a carbon, NiO.sub.2, FeO, FeO.sub.2, Fe.sub.2 O.sub.3, Fe.sub.3 O.sub.4, CoO.sub.2, CeO.sub.2 or TiO.sub.2 powder having a mean particle size of up to 20 .mu.m, and (E) a platinum catalyst. The silicone coated base material is flame resistant and fully acceptable in practical use even though the silicone coating is as thin as 5 to 20 .mu.m, namely less than about one-half of the conventional coating thickness.

Silicone coated base material and air bag base material

The present fluorosilicone composition is an addition reaction curable composition that uses, as an alkenyl group-containing organopolysiloxane, a fluorine-containing organopolysiloxane represented by the following general formula (1): ##STR1## wherein R represents a vinyl group, R.sup.1 represents an alkyl group or a phenyl group, R.sup.2 represents a group represented by the following formula (2): ##STR2## in which p is an integer of 2 to 8 and q is an integer of 1 to 10, and n and m are each a positive integer. This composition can form a gellike cured product particularly excellent in acid resistance.

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Annaka, Japan

Miyuki Tanaka