Abstract: The purpose of the present invention is to provide a polymer having a low halogen atom content remaining in the polymer, a simple production method thereof, an active energy ray-curable composition that can be rapidly cured by an irradiation of a small amount of light, and a cured product thereof. These purpose can be achieved by an active energy ray-curable composition, including a polyisobutylene polymer (A) represented by the following general formula (1) (wherein R1 represents a monovalent or polyvalent aromatic hydrocarbon group, or a monovalent or a polyvalent aliphatic hydrocarbon group; A represents a polyisobutylene polymer; R2 represents a divalent saturated hydrocarbon group having 2-6 carbon atoms, which contains no hetero atoms; R3 and R4 each represent hydrogen, a monovalent hydrocarbon group having 1-20 carbon atoms, or an alkoxy group having 1-20 carbon atoms; R5 represents hydrogen or a methyl group; and n denotes a natural number), and an active energy ray polymerization initiator (B).

Abstract: The purpose of the present invention is to provide a polymer having a low halogen atom content remaining in the polymer, a simple production method thereof, an active energy ray-curable composition that can be rapidly cured by an irradiation of a small amount of light, and a cured product thereof. These purpose can be achieved by an active energy ray-curable composition, including a polyisobutylene polymer (A) represented by the following general formula (1) (wherein R1 represents a monovalent or polyvalent aromatic hydrocarbon group, or a monovalent or a polyvalent aliphatic hydrocarbon group; A represents a polyisobutylene polymer; R2 represents a divalent saturated hydrocarbon group having 2-6 carbon atoms, which contains no hetero atoms; R3 and R4 each represent hydrogen, a monovalent hydrocarbon group having 1-20 carbon atoms, or an alkoxy group having 1-20 carbon atoms; R5 represents hydrogen or a methyl group; and n denotes a natural number), and an active energy ray polymerization initiator (B).

Abstract: The purpose of the present invention is to provide a polymer having a low halogen atom content remaining in the polymer, a simple production method thereof, an active energy ray-curable composition that can be rapidly cured by an irradiation of a small amount of light, and a cured product thereof. These purpose can be achieved by an active energy ray-curable composition, including a polyisobutylene polymer (A) represented by the following general formula (1) (wherein R1 represents a monovalent or polyvalent aromatic hydrocarbon group, or a monovalent or a polyvalent aliphatic hydrocarbon group; A represents a polyisobutylene polymer; R2 represents a divalent saturated hydrocarbon group having 2-6 carbon atoms, which contains no hetero atoms; R3 and R4 each represent hydrogen, a monovalent hydrocarbon group having 1-20 carbon atoms, or an alkoxy group having 1-20 carbon atoms; R5 represents hydrogen or a methyl group; and n denotes a natural number), and an active energy ray polymerization initiator (B).

Abstract: The purpose of the present invention is to provide a polymer having a low halogen atom content remaining in the polymer, a simple production method thereof, an active energy ray-curable composition that can be rapidly cured by an irradiation of a small amount of light, and a cured product thereof. These purpose can be achieved by an active energy ray-curable composition, including a polyisobutylene polymer (A) represented by the following general formula (1) (wherein R1 represents a monovalent or polyvalent aromatic hydrocarbon group, or a monovalent or a polyvalent aliphatic hydrocarbon group; A represents a polyisobutylene polymer; R2 represents a divalent saturated hydrocarbon group having 2-6 carbon atoms, which contains no hetero atoms; R3 and R4 each represent hydrogen, a monovalent hydrocarbon group having 1-20 carbon atoms, or an alkoxy group having 1-20 carbon atoms; R5 represents hydrogen or a methyl group; and n denotes a natural number), and an active energy ray polymerization initiator (B).

Abstract: The present invention relates to a resin composition containing (A) 100 parts by weight of an isobutylene-based block copolymer having an unsaturated bond and comprising (a) a polymer block mainly comprised of isobutylene and (b) a polymer block mainly comprised of an aromatic vinyl-based compound, and (B) 0.1-50 parts by weight of a polythiol compound having two or more thiol groups in one molecule, which aims to provide an isobutylene-based block copolymer composition superior in air barrier property, flexibility, toughness and adhesiveness to rubber, and further, an inner liner as an inner liner layer of a pneumatic tire, which does not require a vulcanization step and superior in the balance between air barrier property, flexibility and toughness, and adhesiveness to carcass.

Abstract: It is an object of the present invention to provide: a rubber stopper composition that is easy to mold and process, excellent in sealing properties and gas-barrier properties, low in propensity to elute into the contents, and satisfactory in needle penetration; and a medical rubber stopper made by using the same. The object of the present invention is attained by a composition made up in a predetermined way by dynamically cross-linking an isobutylene-based polymer in the presence of polyolefin with use of a hydrosilyl-group-containing compound and by further adding a softener to the isobutylene-based polymer thus cross-linked, the isobutylene-based polymer having an alkenyl group at a terminal thereof. To the composition of the present invention, a block copolymer consisting of a polymer block (a) composed mainly of an aromatic vinyl-based compound and a polymer block (b) composed mainly of isobutylene or a lubricant can be added.

Abstract: A synthetic cork stopper which has excellent gas-barrier properties and is satisfactory in sealing properties and suitability for opening. The synthetic cork stopper is obtained by foaming a composition including (a) an isobutylene-based block copolymer comprising a polymer block comprising isobutylene as its main component and a polymer block formed from a cationic polymerizable monomer ingredient in which isobutylene is not its main component; and a foaming agent.

Abstract: The novel thermoplastic elastomer composition of the present invention, which comprises an isobutylene block copolymer (A) containing a polymer block composed predominantly of isobutylene and a polymer block composed predominantly of an aromatic vinyl compound and an alkenyl-terminated isobutylene polymer (B), is highly flexible, and satisfactory in good moldability, rubber-like characteristics, mechanical strengths, permanent compression set characteristics and vibration damping properties.

Abstract: The present invention provides a thermoplastic elastomer composition which is not only satisfactory in rubber-like characteristics and moldability but also satisfactory in both permanent compression set and vibration damping properties and comprises an unsaturated bond-containing isobutylene polymer (A) and an olefinic resin (B).

Abstract: An object of the present invention is to provide a thermoplastic elastomer composition which is highly flexible while maintaining vibration damping properties, as a feature of an isobutylene polymer, and is excellent in moldability and rubber-like properties, and also has particularly improved permanent compression set. The object is achieved by a thermoplastic elastomer composition comprising (A) a composition obtained by crosslinking an isobutylene polymer having an alkenyl group at the molecular ends with a hydrosilyl group-containing compound while melt-kneading in the presence of at least one kind selected from an aromatic vinyl-containing thermoplastic elastomer and an olefinic resin, and (B) at least one kind selected from the group consisting of an aromatic vinyl-containing thermoplastic elastomer and an olefinic resin.

Abstract: The novel thermoplastic elastomer composition of the present invention, which comprises an isobutylene block copolymer (A) containing a polymer block composed predominantly of isobutylene and a polymer block composed predominantly of an aromatic vinyl compound and an alkenyl-terminated isobutylene polymer (B), is highly flexible, and satisfactory in good moldability, rubber-like characteristics, mechanical strengths, permanent compression set characteristics and vibration damping properties.

Abstract: An object of the present invention is to provide a thermoplastic elastomer composition which is highly flexible while maintaining vibration damping properties, as a feature of an isobutylene polymer, and is excellent in moldability and rubber-like properties, and also has particularly improved permanent compression set. The object is achieved by a thermoplastic elastomer composition comprising (A) a composition obtained by crosslinking an isobutylene polymer having an alkenyl group at the molecular ends with a hydrosilyl group-containing compound while melt-kneading in the presence of at least one kind selected from an aromatic vinyl-containing thermoplastic elastomer and an olefinic resin, and (B) at least one kind selected from the group consisting of an aromatic vinyl-containing thermoplastic elastomer and an olefinic resin.

Abstract: The present invention provides a thermoplastic elastomer composition which is not only satisfactory in rubber-like characteristics and moldability but also satisfactory in both permanent compression set and vibration damping properties and comprises an unsaturated bond-containing isobutylene polymer (A) and an olefinic resin (B).