Dow Corning Toray Silicone Company Limited

Toray Silicone Company Limited

Dow Corning Toray Siliconco., Ltd.

Akira Kasuya

Toshio Suzuki

Kazuo Hirai

Atsushi Togashi

There is disclosed a curable organopolysiloxane composition suitable for forming an adherent coating on metals which is durable under acidic conditions, said composition comprising: (A) an organopolysiloxane that contains at least 2 alkenyl groups in each molecule; (B) an organopolysiloxane that contains at least 2 silicon-bonded hydrogen atoms in each molecule; (C) a novel adhesion promoter; and (D) a hydrosilylation catalyst, wherein the adhesion promoter is prepared by reacting

Curable organopolysiloxane composition containing novel adhesion promoter

There is disclosed a curable organopolysiloxane composition suitable for forming an adherent coating on metals which is durable under acidic conditions, said composition comprising:

This invention provides a novel class of organohydrogenpolysiloxanes that function as curing agents for organosiloxane compositions curable by a hydrosilylation reaction in addition to imparting excellent adhesion to the cured composition. This invention also provides curable organosiloxane compositions containing these novel organohydrogen-polysiloxanes. The compositions exhibit excellent adhesion to a variety of organic and inorganic substrates, including but not limited to metals, glasses, and plastics.

Organohydrogenpolysiloxanes and curable organosiloxane compositions

The silicone rubber adhesive film of the present invention is characterized by simplicity of handling and an excellent workability and useablility, as well as by adhesiveness for various types of substrates and an excellent durability of adhesion. These characteristics are obtained because the silicone rubber adhesive film of the present invention comprises a silicone rubber composition which consists of components (A) through (G), particularly the specific wet-method hydrophobicized reinforcing silica comprising component (C) and the specific compounds of components (D) and (E) or components (D), (E), and (F), and because the tensile strength of said uncured silicone rubber composition falls within the range of 1.5 kg/cm.sup.2 to 5.0 kg/cm.sup.2 at 25 degrees Centigrade (JIS K 6301). Accordingly, when used on flat substrates such as textiles, glass, rubber sheet, etc., it can tightly bond the adhered partners into a single, integral body.

Silicone rubber adhesive

An improved self-bonding curable organopolysiloxane composition which contains (A) an organopolysiloxane having at least 2 silicon-bonded alkenyl groups in each molecule, (B) an organopolysiloxane having at least 2 silicone-bonded hydrogen atoms in each molecule, (C) a catalytic quantity of a platinum-type catalyst, (D) a carbonyl complex of a Group VIB element, and (E) a compound containing a silicon-bonded alkoxy group which is selected from the group consisting of silanes or siloxane oligomers. Examples of the carbonyl complex are molybdenum hexacarbonyl, tungsten hexacarbonyl, and chromium hexacarbonyl.

Self-bonding curable organopolysiloxane composition

Organopolysiloxane compositions curable by a hydrosilylation reaction contain a novel adhesion promoter consisting essentially of (1) a carboxylic acid ester containing an acryloyloxy or methacryloyloxy group and an alcoholic functional group and (2) an organosilicon compound containing a silicon-bonded vinyloxy or substituted vinyloxy group. The compositions exhibit excellent adhesion to both organic and inorganic substrates that are in contact with the compositions during curing. The adhesion on plastics is especially good.

Curable organopolysiloxane composition exhibiting improved adhesion in

The addition-curable composition of the present invention, because it comprises a special component as component (D), is characterized by an excellent bonding to any of various substrates with which it is in contact during curing. Component (D) is a mixture, or reaction product, of (a) a silicon-free compound which contains at least 1 alcoholic hydroxyl group and at least 1 alkenyl group in each molecule, and (b) an organosilane having in each molecule at least 1 alkoxy group and at least 1 epoxy or methacryloxy or acryloxy group.

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Chiba, Japan

Akira Kasuya