Abstract: The present invention aims to provide an acrylic copolymer capable of maintaining excellent storage stability in the uncrosslinked state even after long-term exposure to high temperatures, and a crosslinked acrylic rubber product produced from the acrylic copolymer which maintains good normal-state properties and good water resistance. The present invention is based on the finding that an acrylic copolymer produced by polymerizing a liquid mixture of an alkoxyalkyl (meth)acrylate containing an alkoxyalkyl group and a crosslinkable monomer containing a carboxy group has excellent storage stability and that a crosslinked product produced from the acrylic copolymer has good normal-state properties and good water resistance.

Abstract: The present invention addresses the problem of providing an emulsion having excellent emulsion stability and excellent coagulability (salting-out properties) in manufacturing of an acrylic rubber. The present invention provides an acrylic emulsion containing an acrylic polymer having an average particle diameter of 150-300 nm in a step for emulsion-polymerizing a monomer in manufacturing of an acrylic rubber.

Abstract: There is provided a method for more easily producing an acrylic rubber capable of providing a crosslinked rubber having excellent water resistance. A method for producing an acrylic rubber comprising the steps of subjecting a monomer to emulsion polymerization to obtain a polymerized emulsion; mixing the polymerized emulsion with a coagulant to obtain a water-containing crumb; and water-washing the water-containing crumb, wherein, in the step of water-washing the water-containing crumb, the water-containing crumb is water-washed until an electrical conductivity of the washing water after water-washing the water-containing crumb becomes 6.0 mS/cm or less.

Abstract: It is an object of the present invention to provide an acrylic copolymer for providing a highly heat-resistant rubber material that shows a small rate of change in strength without loss of elongation, even under a high-temperature condition over a long period, and a composition containing the acrylic copolymer. The present invention provides an acrylic copolymer comprising a structural unit (A) derived from a monomer containing a structure having a maleimide skeleton, a structural unit (B) derived from an acrylic acid alkyl ester and/or a structural unit (B) derived from an acrylic acid alkoxyalkyl ester, and a structural unit (C) derived from an unsaturated monomer having a crosslinking group; a composition comprising the acrylic copolymer and a crosslinking group; and a rubber material produced from the composition.

Abstract: A composition for sportswear, includes a rubber component (a) which contains an epihalohydrin rubber, a vulcanizing agent (b) in an amount of 0.1 to 10 parts by weight for 100 parts by weight of the rubber component (a), and a foaming agent (c) in an amount of 0.5 to 20 parts by weight therefor. The composition for sportswear is preferably includes a colorant (d).

Abstract: A composition for vulcanizing adhesion, comprises a rubber (a), at least one compound (b) selected from the group consisting of salts of 1,8-diazabicyclo(5.4.0) undecene-7, salts of 1,5-diazabicyclo(4.3.0)-nonene-5, 1,8-diazabicyclo(5.4.0) undecene-7, and 1,5-diazabicyclo(4.3.0)-nonene-5, and at least one water-carrying substance (c) selected from water-absorbed substances and hydrated substances.

Abstract: A composition for sportswear, includes a rubber component (a) which contains an epihalohydrin rubber, a vulcanizing agent (b) in an amount of 0.1 to 10 parts by weight for 100 parts by weight of the rubber component (a), and a foaming agent (c) in an amount of 0.5 to 20 parts by weight therefor. The composition for sportswear is preferably includes a colorant (d).

Abstract: A composition for vulcanizing adhesion, comprises a rubber (a), at least one compound (b) selected from the group consisting of salts of 1,8-diazabicyclo(5.4.0) undecene-7, salts of 1,5-diazabicyclo(4.3.0)-nonene-5, 1,8-diazabicyclo(5.4.0) undecene-7, and 1,5-diazabicyclo(4.3.0)-nonene-5, and at least one water-carrying substance (c) selected from water-absorbed substances and hydrated substances.

Abstract: Disclosed is a vulcanizable rubber composition for use in an air spring, which has excellent low-temperature behavior, and a vulcanized rubber formed product for air springs, which is obtained by vulcanization of the rubber composition. Also disclosed is a vulcanizable rubber composition for use in an air spring, comprising: an epihalohydrin-based copolymer comprising 50 to 70 mol % of a constituent unit derived from ethylene oxide and/or propylene oxide, 20 to 50 mol % of a constituent unit derived from epihalohydrin, and 0 to 15 mol % of a constituent unit derived from allyl glycidyl ether; a vulcanizing agent; a plasticizer; and an acid acceptor, and a rubber formed product for air springs, which is obtained by vulcanization of the composition.

Abstract: A laminated body comprises a rubber layer (A) and a fluororesin layer (B) laminated over the rubber layer (A) The rubber layer (A) is a layer comprising a rubber composition for vulcanization. The rubber composition for vulcanization comprises an epichlorohydrin rubber (a1), at least one compound (a2) selected from the group consisting of salts of 1,8-diazabicyclo(5.4.0)undecene-7, salts of 1,5-diazabicyclo(4.3.0)-nonene-5, 1,8-diazabicyclo(5.4.0) undecene-7, and 1,5-diazabicyclo(4.3.0)-nonene-5, an epoxy resin (a3), and at least one water-carrying substance (a4) selected from water-absorbed substances and hydrated substances. The fluororesin layer (B) is a layer comprising a fluorine-contained polymer composition and the fluorine-contained polymer composition comprises a fluorine-contained polymer (b1) having a copolymerization unit originating from chlorotrifluoroethylene.

Abstract: Disclosed is a vulcanizable rubber composition for use in an air spring, which has excellent low-temperature behavior, and a vulcanized rubber formed product for air springs, which is obtained by vulcanization of the rubber composition. Also disclosed is a vulcanizable rubber composition for use in an air spring, comprising: an epihalohydrin-based copolymer comprising 50 to 70 mol % of a constituent unit derived from ethylene oxide and/or propylene oxide, 20 to 50 mol % of a constituent unit derived from epihalohydrin, and 0 to 15 mol % of a constituent unit derived from allyl glycidyl ether; a vulcanizing agent; a plasticizer; and an acid acceptor, and a rubber formed product for air springs, which is obtained by vulcanization of the composition.

Abstract: An object of the present invention is to provide a method of obtaining high-purity sulfur-containing organosilicon compounds having polysulfide structure in a simple manner without treatment at high temperatures or under vacuum.According to the present invention, sulfur-containing organosilicon compounds represented by the formula (R.sup.1 --O).sub.3 --Si--R.sup.2 --S.sub.x --R.sup.2 --Si--(O--R.sup.1).sub.3 is obtained by reacting sulfur, an alkali metal and halogenoalkoxysilane represented by the formula (R.sup.1 --O).sub.3 --Si--R.sup.2 --X (wherein R.sup.1 is a monovalent C.sub.1-5 hydrocarbon, R.sup.2 is a divalent C.sub.1-9 hydrocarbon, X is a halogen, and x is an integral number of 1 to 8).