A peroxide crosslinkable fluororubber composition comprising: (A) 0.1 to 2.5 parts by weight of a sodium salt or potassium salt of a saturated or unsaturated higher fatty acid; (B) (a) 0.1 to 3.5 parts by weight of a fluoropolyether derivative having a melting point of 70 C. or less, (b) 0.1 to 3.0 parts by weight of a poly--olefin oligomer, or (c) 0.1 to 2.0 parts by weight of an alkylamine compound having 4 to 30 carbon atoms; and (C) 0.1 to 5 parts by weight of an organic peroxide,
based on 100 parts by weight of peroxide crosslinkable fluororubber. This fluororubber composition has excellent crosslinking rate, mold release properties, hardness, compression set characteristics, and the like that are required for molding processability.

A sealing body for dynamic applications has a Shore A hardness of between 60-100, comprising an elastomer material and carbon nanotubes distributed in the elastomer material in an amount of between 0.1-20 phr, with respect to the total amount of elastomer material.

An acrylic rubber that is a copolymer in which 1 to 3 wt. % of a fumaric acid monoalkyl ester monomer containing an alkyl group having 1 to 8 carbon atoms is copolymerized as a crosslinkable comonomer, wherein 45 to 65 wt. % of n-butyl acrylate, 12 to 32 wt. % of 2-methoxyethyl acrylate, and 11 to 30 wt. % of ethoxyethoxyethyl acrylate are copolymerized in 100 wt. % of comonomers other than the crosslinkable comonomer. This acrylic rubber can suppress the reduction of oil resistance while improving cold resistance represented by a TR-10 value.

A rubber composition is, in particular, suitable for producing a sealing part for a high pressure hydrogen apparatus having excellent low temperature sealing properties and blister resistance, and the sealing part for a high pressure hydrogen apparatus is obtained by using the rubber composition. A rubber composition includes an ethylene/butene/ethylidene norbornene terpolymer (EBENB), and the rubber composition is for use in producing a sealing part for a high pressure hydrogen apparatus.

An acrylic rubber contains a copolymer of a monomer mixture of: 25 to 46 wt. % of alkoxyalkyl acrylate, 23 to 37 wt. % of 2-ethylhexyl acrylate, 9 to 17 wt. % of alkyl methacrylate, 1 to 3 wt. % of monoalkyl fumarate and the remaining amount is ethyl acrylate. This acrylic rubber improves hydrolysis resistance by introducing a specific alkyl acrylic monomer with extremely low hydrolysis property i.e. low hydrophilicity, and at the same time satisfies all of oil resistance, cold resistance, and hydrolysis resistance in a well-balanced manner.

The present invention relates to compositions (compounds) which can be used as seal material in vessel caps, even under pasteurization conditions and possibly sterilization conditions. More specifically, the invention relates to such compositions that are suitable for vessel caps that can be unscrewed, such as lug screw caps and in particular Press-on/Twist-off caps, and that result in a reduced migration of undesirable substances.

A hot-melt composition includes, with respect to 100 parts by mass of (A) a hydrogenated styrene thermoplastic elastomer having styrene-based polymer blocks at both ends and a hydrogenated diene polymer block at a middle portion and having a mass-average molecular weight of 250,000-600,000, 20-150 parts by mass of (B) a first styrene-based tackifying resin having a softening point of 135-160 C., 100-400 parts by mass of (C) a second styrene-based tackifying resin having a softening point of 105-135 C., 100-500 parts by mass of (D) a third tackifying resin for the hydrogenated diene polymer block having a softening point of 100-160 C. and 500-1,500 parts by mass of (E) a liquid softener. The hot-melt composition has excellent adhesion and easy peel ability, and is a material suitable as a sealing material for a lighting device of an automobile or the like.

One aspect of the present invention is a hot melt composition including a modified thermoplastic polymer having an alkoxysilyl group in a molecule; a softener; and a catalyst.

The present invention relates to compositions (compounds) which can be used as seal material in vessel caps, even under pasteurization conditions and possibly sterilization conditions. More specifically, the invention relates to such compositions that are suitable for vessel caps that can be unscrewed, such as lug screw caps and in particular Press-on/Twist-Off caps, and that result in a reduced migration of undesirable substances.

A composition comprising a fiber component having a melt/softening temperature and a matrix material for mixing with the fiber component, wherein the composition experiences a vertical rise of at least about 0.5 mm in the absence of any blowing agent when exposed to an elevated temperature of at least about 70 C.