Abstract: The invention relates to a curable composition comprising a crosslinking silyl-containing vinyl polymer. The curable composition of the invention can be utilized, for example, as sealants such as elastic sealants for building and construction, electric or electronic part materials such as solar battery backside sealants, electric insulating materials such as insulating sheath of wire or cable, pressure sensitive adhesives, adhesives, and paints. A curable composition which comprises the following two components: (A) a vinyl polymer (I) having at least one crosslinking functional group and (B) heavy or ground calcium carbonate (II) having a specific surface area of not smaller than 1.5 m2/g but not larger than 50 m2/g.

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.

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: 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.

Abstract: A method of producing 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 is provided. 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 is provided.

Abstract: An acrylic rubber composition providing crosslinked products of good handleability and good characteristics is provided. The acrylic rubber composition comprises the following two components: (A) an acrylic polymer having at least one active halogen represented by the formula (1) at a main terminus: —CH2—C(R1)(R2)(X)  (1) wherein R1 and R2 are the same or different and each represents a hydrogen atom or univalent organic group derived from a group bonded to a vinyl group of a main chain-constituting vinyl monomer and X represents chlorine, bromine or iodine; and (B) a crosslinking agent.

Abstract: The present invention has for its object to provide a curable composition which, despite its low viscosity, gives a cured product with a high gel fraction, low residual tack, low modulus, high elongation, and good flexibility.

Abstract: A composition for roller for an electronic copying machine or printer which comprises a vinyl polymer (A) having at least one alkenyl group per molecule, and a roller as fabricated using said composition for roller. The present invention provides a composition for roller for an electronic copying machine or printer with which an alcohol-soluble nylon layer can be directly constructed on the roller without a primer or other pretreatment.

Abstract: This invention provides method of producing a polymer which comprises substitution of carboxylic acid group for a terminal halogen group of a polymer obtainable by atom transfer radical polymerization. The carboxylic acid group may be a carboxylic acid salt group, more preferably a carboxylic acid potassium salt group. In carrying out the atom transfer radical polymerization in the practice of the invention, a transition metal complex can be used as a polymerization catalyst. The transition metal complex may be a transition metal complex with an element of the group 7, 8, 9, 10 or 11 of the periodic table as the central atom, more preferably a copper, nickel, ruthenium or iron complex and, in particular, a copper complex is used. The polymer obtainable by atom transfer radical polymerization is obtained by polymerization of a (meth)acrylic monomer, particularly the polymer obtained by polymerization of an acrylic acid ester monomer.

Abstract: The present invention has for its object to provide a polymer available upon coupling of polymers of radical-polymerizable olefin monomer or monomers and a process for producing said polymer. The present invention is concerned with a method for effecting polymer-polymer coupling in the living radical polymerization of a radical-polymerizable olefin monomer which comprises adding a compound having at least two sparingly radical-polymerizable alkenyl groups during or after polymerization.

Abstract: The present invention provides a method of purifying a vinyl polymer to be used as a component of a composition capable of undergoing hydrosilylation.

Abstract: An electroconductive paste is provided containing from about 5% to 18% by weight of an organic vehicle comprising a solvent and a binder, from about 80% to 93% by weight of an electroconductive metal powder in a spherical or granular shape and with a particle diameter in the range of about 0.1 to 50 &mgr;m, and from about 2% to 10% by weight of a resin powder with a particle diameter in the range of about 0.1 to 50 &mgr;m which is insoluble in the solvent and has a low level of water absorption. When this paste is used for forming via hole conductors to be converted to external electrode terminals, there is no problem of shape deformation of the via hole conductors. Furthermore, it is possible to restrict crack generation on the sintered electroconductive metal and to restrict breakage of the ceramic areas in the vicinity of the via hole conductors.

Abstract: It is an object of the present invention to provide a curable which has good storage stability and can give cured products retaining the high elongation characteristic originating from the polyether polymer and showing a high gel fraction and good weatherability.

Abstract: This invention has its objects to provide a block copolymer composed of any of various polymers and a living radical polymerization polymer or living cationic polymerization polymer and capable of being produced with ease without requiring optimization of polymerization conditions which is difficult to achieve.

Abstract: The present invention is constituted of a curable composition

Abstract: The invention relates to a curable composition comprising a crosslinking silyl-containing vinyl polymer. The curable composition of the invention can be utilized, for example, as sealants such as elastic sealants for building and construction, electric or electronic part materials such as solar battery backside sealants, electric insulating materials such as insulating sheath of wire or cable, pressure sensitive adhesives, adhesives, and paints.

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 composition comprises (A) an exopy resin and (B) a vinyl polymer having a reactive functional group selected from the group consisting of an alcoholic hydroxyl, phenolic hydroxyl, amino, amido and carboxyl group prepared by living radical polymerization, particularly the atom transfer radical polymerization of a vinyl polymer having a halogen atom and conversion of the halogen atom to a reactive functional group.

Abstract: A vinyl polymer having, at a molecular chain terminus, a structure represented by the general formula 1: 1

Abstract: A pneumatic tire comprises a tread portion provided with a wide groove having a bottom width of not less than 20 mm. The wide groove is provided on the groove bottom with at least one longitudinal rib extending in the longitudinal direction of the wide groove, and lateral ribs extending from the longitudinal rib towards a tread face through the groove bottom and a groove wall of the wide groove, whereby occurrence of bareness of tread rubber in the groove bottom can be prevented.