A rubber includes 5 parts by mass to 45 parts by mass of an uncross-linked EPM relative to 100 parts by mass of a cross-linked rubber polymer (other than EPM), and an oil in an amount equal to or more than the amount of the EPM. The rubber is foamed and has a specific gravity of more than 0.3 and 0.8 or less. A weather strip 1 and a hose 2 are formed of the rubber.

Provided are a foam molded body capable of improving damping properties and sound insulation properties of a panel and realizing weight reduction of a panel, a dam rubber, a complex of a dam rubber and a panel, and a method for increasing a sound transmission loss. The present invention is concerned with a foam molded body of a resin composition containing a block copolymer (I) which is a block copolymer having a polymer block (A) composed mainly of a structural unit derived from an aromatic vinyl compound and other polymer block (B), exhibits a peak top temperature of tan , as measured under a condition of a thickness of a test piece of 1 mm, a strain amount of 0.1%, a frequency of 1 Hz, a measurement temperature of 70 to 70 C., and a temperature rise rate of 3 C./min in conformity with JIS K7244-10 (2005), of 50 to 50 C., and has a peak top molecular weight determined in terms of standard polystyrene by gel permeation chromatography of 30,000 to 500,000; at least one olefin-based polymer (II) selected from the group consisting of an ethylene-propylene-diene copolymer rubber, an ethylene-vinyl acetate copolymer, and a polyethylene-based resin; a crosslinking agent (III); and a foaming agent (IV).

This invention relates to a foaming composition, comprising at least one ethylene-vinyl acetate (EVA) copolymer; at least one foaming agent; at least one peroxide compound; at least one polyamine; at least one crosslinking enhancer; at least one primary antioxidant; and at least one secondary antioxidant; the content of the crosslinking enhancer is from 0.1 to 3% by weight based on the total weight of the composition. A foaming article cured from the foaming composition under the temperature range of 80 to 120 C. according to the present invention exhibits high initial volume expansion ratio at the baking window from 130 to 200 C. and shows excellent stability after storage.

Thermosetting epoxy resin compositions on the one hand at room temperature in the incompletely cured state exhibit extremely slight alteration in shape and on the other hand develop a high surface tack, and, moreover, in the fully cured state are of high impact strength and at the same time exhibits high adhesion, particularly to metallic substrates. These compositions are ideally suited to the production of self-adhesive reinforcing elements.

A railroad rail track pad composition including a particular ethylene.Math.-olefin.Math.non-conjugated polyene random copolymer (A), clay (B), and a sulfur atom-containing silane coupling agent (C) is used in order to lower the viscosity of a rubber composition that is a raw material for molding while suppressing lowering of the rubber elasticity of a crosslinked and molded product to be obtained. In addition, a molded product obtained by crosslinking the composition, particularly a molded product obtained by crosslinking and foam-molding the composition, is provided with rubber elasticity that is suitable as a railroad rail track pad.

A foam rubber molded produce obtained by molding a rubber composition containing 100 parts by mass of ethylene--olefin-nonconjugated diene copolymer, 4 to 30 parts by mass of amorphous 4-methyl-1-pentene copolymer, 2 to 8 parts by mass of blowing agent, and a sulfur-based vulcanizing agent, and having a Mooney viscosity after kneading (ML1+4, 100 C.) of 54 or less. A specific gravity is 0.3 to 0.8, a compression set is less than 27%, and a foam state is an interconnected cell.

A flexible material for thermal and acoustical insulation comprising an expanded polymer (blend) based on at least one elastomer, wherein expansion is achieved by decomposition of a mixture of at least two chemical blowing agents, comprising the exothermic chemical blowing agent 4,4-Oxybis(benzenesulfonyl hydrazide) (OBSH) and at least one endothermic blowing agent.

The present invention discloses a rubber composition, a processing method thereof, and a foamed rubber product produced by the rubber composition and a production method thereof. The rubber composition comprises a rubber matrix and essential components, wherein, based on 100 parts by weight of the rubber matrix, the rubber matrix comprises a branched polyethylene with a content represented as A, in which 0<A100 parts; and an EPM and an EPDM with a total content represented as B, in which 0B<100 parts, and the essential components comprises 0.5-10 parts of a crosslinking agent, and 1.5-25 parts of a foaming agent. The rubber composition is useful in the production of sponge seal strip, foamed rubber compound of high expansion ratio, shock absorbing foamed rubber sheet, light-colored high-strength foamed sheet, foam-solid composite seal strip, and solid cycle tires internally filled with foamed elastomer. The branched polyethylene replaces a part or all of the ethylene-propylene rubber in the foaming rubber composition, which can increase the melt strength, the foamability and particularly the pre-foamability of the rubber composition, and make the rubber product has a lower compression set.

A charging roller has a roller main body including a cylindrical inner layer having a porous structure formed of a semiconductive rubber composition constituted by ethylene propylene rubber, paraffin oil, and a carbon black having a DBP oil absorption amount of 400 cm.sup.3/100 g or more and an outer layer constituted by a nonporous and seamless semiconductive tube including a polyurethane thermoplastic elastomer having a type A durometer hardness of 93 or less, carbon black, and crosslinked PMMA particles having an average particle size of 5 to 20 m. The production method includes a process in which a semiconductive rubber composition forming the inner layer is foamed with OBSH.

A rubber material containing a sulfur-modified chloroprene polymer, in which a content X (% by mass) of sulfur constituting the sulfur-modified chloroprene polymer and a total amount Y (% by mass) of a conjugate resin acid and a salt of a conjugate resin acid, on the basis of a total amount of the rubber material, satisfy Expression (A) below, and the total amount Y is 1.00% by mass or more.

13.90X5.10Y(A)