Abstract: Provided is an addition-reaction-curable organopolysiloxane composition comprising (A) an organopolysiloxane having at least two silicon-atom-binding alkenyl groups per molecule, (B) an organohydrogenpolysiloxane having at least two silicon-atom-binding hydrogen atoms (Si—H groups) per molecule, (C) an organopolysiloxane having at least one (meth)acryl group per molecule, (D) a linear olefin having a melting point of 20° C. or lower and a flash point of 40° C. or higher, and (E) a platinum-group metal-based catalyst, in which the amount of a metal other than a platinum-group metal is 100 ppm or less, the addition-reaction-curable organopolysiloxane composition can be cured satisfactorily and exhibits satisfactory adhesiveness even when the amount of the platinum-group metal-based catalyst is small, and an acryl-group-containing silicone cannot be precipitated and separated over time.

Abstract: The object of the present invention is to provide a silicone composition which provides a release coating having excellent adhesion to a substrate, in particular a plastic film substrate, such as a polyester film. Further, an object of the present invention is to provide a release sheet having a cured coating of the silicon composition. It is also an object of the present invention to provide a silicone composition which has improved storage stability and does not cause separation of the functional compound during long-term storage or transportation. The present invention provides a silicone composition comprising the following components (A) to (C): (A) an organopolysiloxane having at least two alkenyl groups each bonded to a silicon atom in a molecule, having a viscosity at 25 degrees C.

Abstract: One of the purposes of the present invention is to provide an addition-curable organopolysiloxane composition which cures sufficiently with a minor amount of platinum group metal catalyst to exert satisfactory adhesion and provides a cured film having a release force comparable to the prior art cured film, and to provide an addition-curable organopolysiloxane composition which allows the sufficient progress of addition cure even on a substrate comprising a catalyst poison component so as to be suitable for providing a release coating for silicone rubber and release paper or release film. That is, the present invention provides an addition-curable organopolysiloxane composition comprising components (A) to (C): (A) an organopolysiloxane having two or more alkenyl groups each bonded to a silicon atom per molecule and having 0.01 to 2.

Abstract: This organopolysiloxane composition for use in release paper or release film, said organopolysiloxane composition containing (A) an organopolysiloxane having two or more silicon atom-bonded alkenyl groups in each molecule, (B) an organohydrogen polysiloxane having two or more silicon atom-bonded hydrogen atoms (Si—H groups) on average in each molecule, (C) an organic peroxide and (D) a specific amount of a platinum group metal-based catalyst, is capable of undergoing an addition reaction with a smaller amount of the platinum group metal-based catalyst in comparison to the prior art, thereby being capable of forming a cured coating film which has a release strength equivalent to that of the prior art even in cases where a component that inhibits the catalytic activity of the platinum group metal-based catalyst is contained in the composition.

Abstract: Provided is a silicone composition having components (A) to (E):100 parts by mass of (A) a linear, branched, or network organopolysiloxane having a vinyl value of 0.01 mol/100 g or more and 0.04 mol/100 g or less and a viscosity of 100 mm2/sec or more and 500 mm2/sec or less at 25° C., wherein each of terminals of the organopolysiloxane has one or more alkenyl groups; 0.01 to 3 parts by mass of (B) a linear, branched, or network organopolysiloxane having a vinyl value of 0.2 mol/100 g or more and 1.2 mol/100 g or less and a viscosity of 2 mm2/sec or more and 60 mm2/sec or less at 25° C., wherein each of terminals of the organopolysiloxane has one or more alkenyl groups; (C) an organohydrogenpolysiloxane having an amount of 1 mol/100 g or more and 2 mol/100 g or less of an SiH group, wherein a ratio of the number of the SiH group in component (C) to a total number of the alkenyl groups in components (A) and (B) is 1 to 5; 0.

Abstract: The purpose of the present invention is to provide a platinum-group metal catalyst having high storage stability and being able to promote an addition reaction even when the amount of the platinum-group metal catalyst is small; a curable organopolysiloxane composition comprising the catalyst; and a release sheet comprising a cured product of the composition. That is, the present invention provides a catalyst composition comprising i) a platinum-group metal catalyst and ii) an organopolysiloxane having at least two (meth)acryloyl groups in one molecule, wherein an amount of the platinum-group metal atom is 0.01 to 5.0 mass %, based on a total mass of the catalyst composition.

Abstract: In the present invention, compounding an addition-reaction-curable organopolysiloxane composition with a specific amount of an organopolysiloxane compound that has three or more (meth)acryl groups in the molecule and a weight-average molecular weight of 1,000 or greater yields an organopolysiloxane composition for use in a release paper or release film in which addition reactions can occur using a small amount of platinum family metal catalyst, cured films can be formed having a peeling strength approximating levels encountered in the past, and addition-reaction-prompted curing will proceed even on a base material containing a catalyst-poisoning component.

Abstract: The object of the present invention is to provide a silicone composition which provides a release coating having excellent adhesion to a substrate, in particular a plastic film substrate, such as a polyester film. Further, an object of the present invention is to provide a release sheet having a cured coating of the silicon composition. It is also an object of the present invention to provide a silicone composition which has improved storage stability and does not cause separation of the functional compound during long-term storage or transportation. The present invention provides a silicone composition comprising the following components (A) to (C): (A) an organopolysiloxane having at least two alkenyl groups each bonded to a silicon atom in a molecule, having a viscosity at 25 degrees C.

Abstract: Provided is an organo-polysiloxane composition for use in release paper or release film, capable of forming a hardened coat having a low release force. The invention is an organo-polysiloxane composition for use in release paper or release film, containing the components (A) to (D). (A) An organo-polysiloxane having two or more silicon atom-bound alkenyl groups within one molecule: 100 parts by mass. (B) An organo-hydrogen polysiloxane having at least an average of two or more silicon atom-bound hydrogen atoms (Si—H groups) within one molecule: an amount such that the number of moles of the Si—H groups is equal to 1 to 5 times that of the number of moles of the alkenyl groups within the (A) component. (C) A compound having one or more (meth)acrylic groups within one molecule, and whereof the molecular weight is 72 to 1,000: 0.01 to 3 parts by mass with respect to 100 parts by mass of the (A) component.

Abstract: An organopolysiloxane composition obtained by dissolving in a solvent an organopolysiloxane crosslinked product obtained by repeating one or more times a process of again introducing an organopolysiloxane and an organohydrogenpolysiloxane to a product, obtained by conducting an addition reaction of an organopolysiloxane of a specific structure and an organohydrogenpolysiloxane of a specific structure using a platinum group metal-based compound in 10-50 times the total mass of these polysiloxanes, and conducting an addition reaction using a platinum group metal-based compound.

Abstract: Provided is a silicone composition having components (A) to (E):100 parts by mass of (A) a linear, branched, or network organopolysiloxane having a vinyl value of 0.01 mol/100 g or more and 0.04 mol/100 g or less and a viscosity of 100 mm2/sec or more and 500 mm2/sec or less at 25° C., wherein each of terminals of the organopolysiloxane has one or more alkenyl groups; 0.01 to 3 parts by mass of (B) a linear, branched, or network organopolysiloxane having a vinyl value of 0.2 mol/100 g or more and 1.2 mol/100 g or less and a viscosity of 2 mm2/sec or more and 60 mm2/sec or less at 25° C., wherein each of terminals of the organopolysiloxane has one or more alkenyl groups; (C) an organohydrogenpolysiloxane having an amount of 1 mol/100 g or more and 2 mol/100 g or less of an SiH group, wherein a ratio of the number of the SiH group in component (C) to a total number of the alkenyl groups in components (A) and (B) is 1 to 5; 0.

Abstract: A release sheet having excellent curability and adhesion to substrates and a very low release force at high speeds as well as at low speeds can be obtained by coating a sheet-like substrate with a solvent-free curable silicone releasing agent composition that comprises components (A) to (E), and thermally curing the same. (A) An alkenyl group-containing organopolysiloxane that has a vinyl value of 0.016 to 0.05 mol/100 g and a kinematic viscosity of 80 to 450 mm2/s, (B) an organohydrogenpolysiloxane having a SiH amount using formulas (1) and (2) at a mass ratio of 100:5 to 100:200 of 0.016 to 0.5 mol/100 g, M?MH?DH?T?Q???(1), M?MH?DH?D?T?Q???(2), (? and ? are 0 or an integer, 2??+?, 10???100, 0???10, 0???10, 5???60, 10???50, 0???10, and 0???10), (C) an organopolysiloxane of formula (3), M12D???(3), (? is 300 to 3,000), (D) an addition reaction controlling agent, and (E) a catalyst for addition reaction.

Abstract: The present invention provides a solvent-free silicone release composition containing (A) an alkenyl group-containing organopolysiloxane having a vinyl value of 0.016-0.7 mol/100 g and a kinematic viscosity at 25° C. of 80-500 mm2/s, (B) an organo hydrogen polysiloxane having a kinematic viscosity of 2-500 mm2/s, (C) a platinum group metal-based catalyst, and (E) an organopolysiloxane having a crosslinked structure and fluidity. According to the present invention, surface roughness caused by high speed rotation of a roll or surface protrusions and recesses caused by the generation of mist can be eliminated during high-speed coating on a sheet-like substrate, and a release sheet can be obtained in which a cured silicone-coated surface has excellent smoothness and an adhesive-coated substrate has a low high-speed peel strength.

Abstract: Provided are a siloxane composition, said siloxane composition showing physical properties between a dimethyl polysiloxane oil and a gelatinous crosslinked siloxane and being fluid or becoming fluid when dissolved in a solvent, and a method for producing the same. The siloxane composition, which is obtained by subjecting specific starting organopolysiloxane materials to an addition reaction in a large excess (i.e., 8 times by mass or greater as much as the starting materials) of a solvent, comprises a crosslinked organopolysiloxane, said crosslinked organopolysiloxane having a weight-average molecular weight of 5,000-300,000,000 and containing 0.1-50 mol of silethylene bond per 1,000 mol of siloxane unit, dissolved in the solvent.

Abstract: Provided are: a crosslinked organopolysiloxane which has properties intermediate between a dimethylpolysiloxane oil and a gel-like crosslinked siloxane; and a method for producing the crosslinked organopolysiloxane. An oil-like organopolysiloxane which is produced by: adding a compound having a siloxane unit represented by formula (3) to a gel-like silicone, wherein the gel-like silicone is produced by a hydrosilylation reaction of an organopolysiloxane having an alkenyl group with an organohydrogenpolysiloxane having a hydrogen atom bonded to a silicon atom in the presence of a platinum-group metal catalyst; and then equilibrating the resultant product with an acid or alkali catalyst. R12SiO2/2??(3) (R1 represents a group selected from a monovalent hydrocarbon group having no aliphatic unsaturated bond and an alkenyl group represented by the formula: —(CH2)a—CH?CH2 (wherein a represents a numerical value of 0 to 6), and the average polymerization degree of formula (3) is 3 to 2,000).

Abstract: An organopolysiloxane composition obtained by dissolving in a solvent an organopolysiloxane crosslinked product obtained by repeating one or more times a process of again introducing an organopolysiloxane and an organohydrogenpolysiloxane to a product, obtained by conducting an addition reaction of an organopolysiloxane of a specific structure and an organohydrogenpolysiloxane of a specific structure using a platinum group metal-based compound in 10-50 times the total mass of these polysiloxanes, and conducting an addition reaction using a platinum group metal-based compound.

Abstract: Provided is a light release additive for release sheets, the additive being capable of achieving a desired light release force with a small addition thereof to an organopolysiloxane composition for release sheets and of providing an excellent release coating such that the released adhesive sheet has a high subsequent adhesion. This light release additive for release sheets comprises an acryl-silicone-based graft copolymer with a weight-average molecular weight of 1,000 to 100,000 obtained by radical polymerization of (A) an organopolysiloxane compound having an acrylic group and/or a methacrylic group and (B) a radical polymerizable monomer having one radical polymerizable group per molecule.

Abstract: Provided are a siloxane composition, said siloxane composition showing physical properties between a dimethyl polysiloxane oil and a gelatinous crosslinked siloxane and being fluid or becoming fluid when dissolved in a solvent, and a method for producing the same. The siloxane composition, which is obtained by subjecting specific starting organopolysiloxane materials to an addition reaction in a large excess (i.e., 8 times by mass or greater as much as the starting materials) of a solvent, comprises a crosslinked organopolysiloxane, said crosslinked organopolysiloxane having a weight-average molecular weight of 5,000-300,000,000 and containing 0.1-50 mol of silethylene bond per 1,000 mol of siloxane unit, dissolved in the solvent.

Abstract: Provided are a siloxane composition, said siloxane composition showing physical properties between a dimethyl polysiloxane oil and a gelatinous crosslinked siloxane and being fluid or becoming fluid when dissolved in a solvent, and a method for producing the same. The siloxane composition, which is obtained by subjecting specific starting organopolysiloxane materials to an addition reaction in a large excess (i.e., 8 times by mass or greater as much as the starting materials) of a solvent, comprises a crosslinked organopolysiloxane, said crosslinked organopolysiloxane having a weight-average molecular weight of 5,000-300,000,000 and containing 0.1-50 mol of silethylene bond per 1,000 mol of siloxane unit, dissolved in the solvent.

Abstract: Provided are: a crosslinked organopolysiloxane which has properties intermediate between a dimethylpolysiloxane oil and a gel-like crosslinked siloxane; and a method for producing the crosslinked organopolysiloxane. An oil-like organopolysiloxane which is produced by: adding a compound having a siloxane unit represented by formula (3) to a gel-like silicone, wherein the gel-like silicone is produced by a hydrosilylation reaction of an organopolysiloxane having an alkenyl group with an organohydrogenpolysiloxane having a hydrogen atom bonded to a silicon atom in the presence of a platinum-group metal catalyst; and then equilibrating the resultant product with an acid or alkali catalyst. R12SiO2/2??(3) (R1 represents a group selected from a monovalent hydrocarbon group having no aliphatic unsaturated bond and an alkenyl group represented by the formula: —(CH2)a—CH?CH2 (wherein a represents a numerical value of 0 to 6), and the average polymerization degree of formula (3) is 3 to 2,000.