Abstract: An acryloxy-functional silicone composition curable by high-energy radiation, which is characterized by excellent storage stability of the composition and by improved resistance to scratching, transparency, water repellency, and adhesiveness in a hard cured coating film produced from the aforementioned composition. This composition comprises (A) a polyfunctional acrylate of at least one type; an amino-modified organopolysiloxane (B) or a product (F) of a Michael addition reaction between at least one type of a polyfunctional acrylate and amino-modified organopolysiloxane; (C) an organoalkoxysilane having an aliphatic unsaturated bond, (D) a colloidal silica; and (E) an alcohol-containing organic solvent.

Abstract: An addition-curable organopolysiloxane resin composition having, in a state of cued body, a hardness of 60 to 100 at 25 degree C. and 40 to 100 at 150 degree C. as measured in accordance with the provisions of ASTM D2240-86, said composition comprising: (A) 100 parts by weight of an organopolysiloxane resin comprised of at least alkenyl groups and phenyl groups; (B) 10 to 50 parts by weight of an organooligosiloxane comprised of at least alkeyl groups and phenyl groups; (C) 20 to 100 parts by weight of an organohydrogenoligosiloxane of organohydrogenpolysiloxane; and (D) an addition-reaction catalyst in a catalytic quantity; an optical material that is comprised of a cured body produced from aforementioned components (A), (B), and (C) and possesses the aforementioned characteristics.

Abstract: An firmly bonded composite of a silicone resin and an epoxy resin comprising: (A) a curable silicone resin composition comprising: (A1) an organopolysiloxane resin that has a refractory index of above 1.45 but below 1.60 and contains at least two silicon-bonded alkenyl groups having 2 to 12 carbon atoms, and no less than 30 mole percent of total siloxane units is phenylsiloxane units represented by the following formula: C6H5—SiO3/2, (A2) an organopolysiloxane that contains at least two silicon-bonded hydrogen atoms and (A3) hydrosilylation catalyst, and (B) a curable epoxy resin composition comprising: (B1) an epoxy resin that contains at least two epoxy groups in one molecule, (B2) a curing agent, and (B3) a curing catalyst. The firmly bonded composite is obtained only by curing composition (A) and composition (B) in tight contact with each other.

Abstract: An integrally molded body of a silicone resin and silicone rubber comprises a cured body of a curable silicone composition (A) comprising an organopolysiloxane resin (A1) that contains at least two silicon-bonded alkenyl groups, and not less than 30 mole percent of total siloxane units of RsiO3/2 units, an organopolysiloxane (A2) that contains at least two silicon-bonded hydrogen atoms, and a platinum group metal catalyst (A3) in a catalytic amount, and a cured body of a silicone rubber composition (B) comprising diorganopolysiloxane (B1) that contains at least two silicon-bonded alkenyl groups, a organopolysiloxane (B2) that contains at least two silicon-bonded hydrogen atoms, and a platinum group metal catalyst or an organic peroxide (B3) in a catalytic amount. The manufacture of the integrally molded body is carried out by curing composition (A) and composition (B) in the same mold.

Abstract: An addition-curable organopolysiloxane resin composition having, in a state of cued body, a hardness of 60 to 100 at 25 degree C. and 40 to 100 at 150 degree C. as measued in accordance with the provisions of ASTM D2240-86, said composition comprising: (A) 100 parts by weight of an organopolysiloxane resin comprised of at least alkenyl groups and phenyl groups; (B) 10 to 50 parts by weight of an organooligosiloxane comprised of at least alkenyl groups and phenyl groups; (C) 20 to 100 parts by weight of an organohydrogenoligosiloxane or organohydrogenpolysiloxane; and (D) an addition-reaction catalyst in a catalytic quantity; an optical material that is comprised of a cured body producted from aforementioned components (A), (B), and (C) and posseses the aforementioned characteristics.

Abstract: The invention relates to a straight-oil finishing composition comprising (A) 100 parts by weight of a polydimethylsiloxane oil or liquid paraffin having a viscosity of 3 to 70 mm2/s at 25 centigrade temperature; and (B) 0.5 to 100 parts by weight of an organopolysiloxane resin, which contains silanol groups and silicon-bonded alkoxy groups and wherein 20 mole % or more of all siloxane units are siloxane units represented by formula C3H7SiO3/2. This composition is useful for treating fiber yarn.

Abstract: An acryloxy-functional silicone composition curable by high-energy radiation, which is characterized by excellent storage stability of the composition and by improved resistance to scratching, transparency, water repellency, and adhesiveness in a hard cured coating film produced from the aforementioned composition. This composition comprises (A) a polyfunctional acrylate of at least one type; an amino-modified organopolysiloxane (B) or a product (F) of a Michael addition reaction between at least one type of a polyfunctional acrylate and amino-modified organopolysiloxane; (C) an organoalkoxysilane having an aliphatic unsaturated bond, (D) a colloidal silica; and (E) an alcohol-containing organic solvent.

Abstract: The invention relates to a straight-oil finishing composition comprising (A) 100 parts by weight of a polydimethylsiloxane oil or liquid paraffin having a viscosity of 3 to 70 mm2/s at 25 centigrade temperature; and (B) 0.5 to 100 parts by weight of an organopolysiloxane resin, which contains silanol groups and silicon-bonded alkoxy groups and wherein 20 mole % or more of all siloxane units are siloxane units represented by formula C3H7SiO3/2. This composition is useful for treating fiber yarn.

Abstract: A highly storage-stable room-temperature-curable organopolysiloxane composition that cures to yield a product whose surface resists staining and that does not cause staining of the neighboring regions of the substrate in contact with said cured product. The organopolysiloxane composition is made from a polydiorganosiloxane, an imidazolinyl-functional organosiloxane, a filler, and a crosslinking compound which is a Si-bonded hydrolyzable group-containing organosilane or organosiloxane oligomer.

Abstract: A polyimide resin having excellent storage stability which cures to give a highly adherent, highly heat-resistant, and highly moisture-resistant film is disclosed, said resin being prepared by reacting(A) a tetracarboxylic dianhydride and(B) a diamino-functional siloxane compound having the general formula ##STR1## in which each R.sup.1 is independently selected from C.sub.1 to C.sub.20 monovalent hydrocarbon radicals, each R.sup.2 is independently selected from C.sub.1 to C.sub.20 divalent hydrocarbon radicals, R.sup.3 is selected from the group consisting of hydrogen and --SiR.sup.1.sub.3 wherein R.sup.1 is defined as above, a is an integer from 1 to 20, b is an integer from 1 to 20, c is an integer from 0 to 20, and d is an integer from 1 to 20.

Abstract: There is disclosed an organosilicon compound which contains a silicon-bonded functional group at each molecular chain terminal as well as a terminal -SiH group on a side chain branching from the main chain, said functional group being selected from amino-functional organic groups, epoxy-functional organic groups, hydroxyl group or a group obtained by substituting active hydrogen in the preceding groups with triorganosilyl group.

Abstract: Imidazolinyl-functional organosiloxanes in which an aliphatically unsaturated monovalent hydrocarbon radical is bonded at the 2-position of the imidazoline ring, have from 2 to 1,100 siloxane units where at least one siloxane unit has an imidazolinyl radical of the following general formula bonded to silicon ##STR1## wherein R.sup.1 is a C.sub.1 to C.sub.50 divalent hydrocarbon radical, each R.sup.2 is hydrogen atom or a C.sub.1 to C.sub.50 monovalent hydrocarbon radicals, and R.sup.3 is a C.sub.2 to C.sub.50 aliphatically unsaturated monovalent hydrocarbon radical, and method for the preparation thereof by a dehydration reaction of an amino-functional organosiloxane and an aliphatically unsaturated monocarboxylic acid.

Abstract: The introduction of a room-temperature-curable organopolysiloxane composition that cures at room temperature to give a rubber whose surface is easily coated with paint and from which the resulting paint film does not delaminate readily and that after curing is free from staining of the surface of the rubber and any substrates in contact with the rubber.

Abstract: The linear organosilicon compounds of this invention contain at least two silicon-bonded hydrogen atoms at one of the two terminal positions of the molecule and at least two silicon-bonded hydrolyzable groups at the other terminal position. The compounds are useful as intermediates for preparing organosilicon compounds containing at least two organofunctional groups in each molecule.

Abstract: A polyimide resin is prepared by reaction of a tetracarboxylic dianhydride with a specified class of amino functional organosilicon compounds followed by cycloimidization of the resultant polyamide acid intermediate. The resin is characterized by an excellent adhesion to various types of inorganic substrates such as glass. The present method employs relatively low temperatures for the cycloimidization reaction.

Abstract: Low-molecular-weight phenylpolysilsesquioxanes that have narrow molecular weight distribution and a method for the preparation of the same.