Abstract: The present invention provides a curable composition comprising: (A) a vinyl polymer (I) comprising, at the molecular terminus, at least one group represented by the general formula (1): CH2?C(Ra)—C(O)O—??(1) wherein Ra represents a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms, (B) a polymerization initiator, and (C) a metallic soap. The curable composition comprising a vinyl polymer has superior mold release properties without a substantial decrease in mechanical properties such as compression set.

Abstract: The present invention uses a curable composition comprising a poly(meth)acrylate having at least one crosslinkable functional group, and a surface tack modifier having a melting point of between 30° C. and 200° C. at 1 atm. Preferable examples of the preferred surface tack modifier include an aliphatic hydrocarbon compound, an aliphatic carboxylic acid, an aliphatic alcohol, an aliphatic carboxylic acid ester, a natural wax, an aliphatic carboxylic acid amide, and an organic polymer. The surface tack of the cured product can be reduced by employing the present invention.

Abstract: The present invention relates to a method for producing a vinyl polymer retaining the ability for atom transfer radical polymerization, a method for reliably producing a vinyl polymer having terminal functional groups, a vinyl polymer having functional groups prepared by these methods, and a curable composition comprising the polymer. A vinyl polymer having terminal functional groups can be reliably produced through the steps of preparing a vinyl polymer by atom transfer radical polymerization of a vinyl monomer in a polymerization solvent in the presence of a polymerization initiator and a transition metal complex functioning as a polymerization catalyst, removing the polymerization solvent and the vinyl monomer while the ability for atom transfer radical polymerization is maintained, and supplying a functional-group-introducing agent having a low polymerizability to introduce a functional group to a polymer terminus.

Abstract: The present invention provides a method for producing a vinyl polymer including the steps of polymerizing a vinyl monomer by atom transfer radical polymerization with a transition metal complex as a polymerization catalyst, and bringing the resultant vinyl polymer into contact with an adsorbent in the presence of an oxidizing agent; the vinyl polymer produced by the method; and a reactive composition susceptible to hydrosilylation containing the vinyl polymer produced by the method and having at least one alkenyl group per molecule.

Abstract: A sealing material, which comprises a curing product of a composition comprising (A) an acrylic polymer having at least one alkenyl group capable of undergoing hydrosilylation reaction, (B) a hydrosilyl group-containing compound and (C) a hydrosilylation catalyst as essential components, is suitable for use as cam cover seals and oil pan seals for automobile engines, fuel cell cooling medium seals, automobile wire harnesses seals, HDD cover gasket or vibration-insulating HDD cover gasket seals, etc.

Abstract: A material for vibration-absorbable mounts, which comprises a cured product of a composition comprising (A) an acrylic polymer having at least one alkenyl group capable of undergoing hydrosilylation reaction, (B) a hydrosilyl group-containing compound and (C) a hydrosilylation catalyst as essential components, has a distinguished vibration-absorbing characteristic such as a loss tangent (tan ?) of 0.5 or more, and also a distinguished heat resistance, and thus is sufficiently suitable for vibration-absorbable mounts for HDDs as mounted on automobiles. Furthermore, the material for vibration-absorbable mounts has distinguished heat resistance, oil resistance, vibration-absorbing characteristic, compression set characteristic, low hardness, cleanliness (out gassing property and non-corrosiveness), etc. and thus can be effectively used as vibration-absorbable mounts for electric and electronic parts provided with opto-magnetic drives, for example CD, DVD, HDD, etc.

Abstract: A sealing material, which comprises a curing product of a composition comprising (A) an acrylic polymer having at least one alkenyl group capable of undergoing hydrosilylation reaction, (B) a hydrosilyl group-containing compound and (C) a hydrosilylation catalyst as essential components, is suitable for use as cam cover seals and oil pan seals for automobile engines, fuel cell cooling medium seals, automobile wire harnesses seals, HDD cover gasket or vibration-insulating HDD cover gasket seals, etc.

Abstract: A curable composition having a low viscosity and providing a satisfactory rubber cured article is provided. A composition curable by radical photo curing and cationic photo curing in combination, comprising the under-mentioned components (A), (B), (C) and (D) as essential components: (A) a vinyl polymer having two or more acryloyl group or the like per molecule, the acryloyl groups or the like being present at one or more molecular ends; (B) an epoxy compound and/or an oxetane compound; (C) a radical photopolymerization initiator; and (D) a cationic photopolymerization initiator.

Abstract: An active energy curing type composition for an in-place shaping gasket is provided which is capable of providing an in-place shaped gasket superior in heat resistance, weather resistance, oil resistance, curability, compression set, and the like. An active energy curing type composition for an in-place shaping gasket, comprising the under-mentioned components (A) and (B) as essential components, wherein the viscosity of the composition is 400 Pa·s or less at 23° C. and the compression set of a cured article which is prescribed in JIS K 6262 is 30% or less: (A) a vinyl polymer having two or more (meth)acryloyl groups per molecule at the molecular ends, and (B) a vinyl polymer having one (meth)acryloyl group per molecule at the molecular end.

Abstract: An object of the present invention is to provide a curable composition comprising a vinyl polymer, the curable composition capable of providing a cured product having good mechanical properties. The present invention is a curable composition comprising (A) a vinyl polymer (I) comprising, at the molecular terminal, at least one group represented by the general formula (1): CH2?C(Ra)—C(O)O— (1), wherein Ra represents a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms, and (B) a monoacrylate phenolic antioxidant.

Abstract: A method of producing a polymer or a stellar polymer which comprises polymerizing a vinyl monomer in the manner of living radical polymerization and adding a compound having two or more polymerizable carbon-carbon double bonds at the end point of the polymerization. A composition which comprises, as an essential component, a hydroxyl-terminated polymer falling under said polymer and a compound having, in each molecule, not less than two functional groups reactive with the hydroxyl group.

Abstract: A liquid sealing agent used for automobile parts, electric parts, various kinds of machine parts and the like exhibits good oil resistance, heat resistance, adhesiveness and flexibility. A vinyl polymer has at least one crosslinkable silyl group and can yield a cured product exhibiting an oil resistance superior to that of a cured product from a reference polymer obtained by replacing the repeating unit thereof with butyl acrylate alone, in any one item of the immersion test according to JIS K 6258 for the land use 3-5 lubricating oil specified in JIS K 2215.

Abstract: The present invention has its object to provide a curable composition which comprises a vinyl polymer excellent in resistances against various conditions and showing good mechanical characteristics, and can be cured by the hydrosilylation reaction, and the cured product obtainable from the curable composition shows hardness retention and excellent discoloration resistance in thermal aging resistance testing. Specifically, the present invention relates to a curable composition which comprises, as constituents: (A) A vinyl polymer (I) having, within the molecule, at least one alkenyl group capable of being hydrosilylated, (B) A hydrosilyl group-containing compound (II), (C) A hydrosilylation catalyst, (D) A phenolic antioxidant, and (E) A sulfur-containing antioxidant.

Abstract: The present invention relates to a vinyl polymer terminated in a silanol group, a hydrolyzable silyl group or an acrylic functional group, to a method of producing a vinyl polymer having a hydrolyzable silyl group at one or more termini thereof which comprises reacting a vinyl polymer having a silanol group at one or more termini thereof with a silicon compound having two or more silicon atom-bound hydrolyzable groups, and a method of producing a vinyl polymer having an acrylic functional group at one or more termini thereof which comprises reacting a vinyl polymer having a silanol group at one or more termini thereof with a silicon compound represented by the general formula (3): XSiR2—G—O—C(O)C(L)?CH2 ??(3) wherein X is a hydrolyzable group.

Abstract: An alkenyl- or crosslinkable silyl-terminated vinyl polymer is provided. Such a functional group is introduced into its terminus at a high ratio, not via sulfur atoms. Those polymers can be prepared by polymerizing a vinyl monomer for obtaining a halogen-terminated vinyl polymer, and then substituting an oxy anion or carbanion having such a functional group for the terminal halogen of said polymer.

Abstract: The present invention provides a vinyl polymer with an epoxy group terminally introduced therein and an epoxy resin composition comprising (A) an epoxy resin and (B) a vinyl polymer which has a main chain produced by living-radical polymerization and has a reactive functional group at a main chain terminus. A flexible epoxy resin composition can be obtained using these compounds. The invention further provides an epoxy resin composition-having an epoxy group at a main chain terminus thereof.

Abstract: A liquid sealing agent used for automobile parts, electric parts, various kinds of machine parts and the like has encountered a problem that it is difficult to combine good oil resistance, heat resistance, adhesiveness and flexibility. The present invention provides a liquid gasket which improves these problems, and a material thereof. In the present invention, it is used a vinyl polymer which has at least one crosslinkable silyl group and can yield a cured product exhibiting an oil resistance superior to that of a cured product from a polymer obtained by replacing the repeating unit thereof with butyl acrylate alone, in any one item of the immersion test according to JIS K 6258 for the land use 3-5 lubricating oil specified in JIS K 2215.

Abstract: This invention provides a method for purification of a vinyl polymer which comprises the atom transfer radical polymerization of a vinyl monomer using a transition metal complex as the polymerization catalyst, said vinyl polymer being brought into contact with an oxidizing agent or a reducing agent.

Abstract: The present invention provides a vinyl polymer with an epoxy group terminally introduced therein and an epoxy resin composition comprising (A) an epoxy resin and (B) a vinyl polymer which has a main chain produced by living-radical polymerization and has a reactive functional group at a main chain terminus. A flexible epoxy resin composition can be obtained using these compounds. The invention further provides an epoxy resin composition-having an epoxy group at a main chain terminus thereof.

Abstract: A vinyl polymer having, at a molecular chain terminus, a structure represented by the general formula 1: (wherein R3 is a hydroxy, amino, epoxy, carboxylic acid, ester, ether, amide or silyl group, an alkenyl group having low polymerizability, an organic compound having 1 to 20 carbon atoms, X is a halogen atom, a nitroxide or sulfide group or a cobalt porphyrin complex).