Provided is a crosslinked polyolefin foam is made by crosslinking and foaming the composition, wherein a product of 25% compressive strength (kPa) and tensile strength (MPa) of the crosslinked polyolefin foam at normal temperature is 35 to 65.

A thermoplastic elastomer composition includes about 80 parts by weight of an ethylene propylene diene monomer (EPDM) including 5-ethylidene-2-norbornene (ENB) and polyethylene, about 30 parts by weight to about 70 parts by weight of polypropylene, about 20 parts by weight to about 40 parts by weight of a filler, and about 60 parts by weight to about 90 parts by weight of a plasticizer.

A nitrile rubber composition comprising a highly saturated nitrile rubber (A) containing α,β-ethylenically unsaturated nitrile monomer units in a ratio of 8 to 60 wt % and having an iodine value of 120 or less and an alkylated phenol compound (B), wherein a ratio of content of the alkylated phenol compound (B) with respect to a total of the highly saturated nitrile rubber (A) and the alkylated phenol compound (B) is 0.01 to 1 wt %, and a difference (η2−η1) between a plasticity number η2 after storage at 70° C. for 7 days in a state of an aqueous dispersion by being dispersed in water and a plasticity number η1 before the storage is 12 or less is provided.

Disclosed is a diaphragm and a sound generating device. The raw material of the diaphragm comprises a liquid diene-based rubber and a vulcanizing agent, and the liquid diene-based rubber comprises a liquid butadiene-based rubber or a liquid isoprene-based rubber. The diaphragm is prepared by injecting the raw material into a diaphragm forming mold and then performing a cross-linking reaction. The diaphragm has an elongation at break of more than 200%, therefore the reliability of the diaphragm is high, the diaphragm has a damping of more than 0.07, and the has higher damping in the range of the operating temperature and frequency, therefore the loudspeaker using this diaphragm may obtain lower THD, higher listening yield, better sound quality, and swing during vibration not easily occurs, the listening stability is good, and the diaphragm can also ensure that the defects such as diaphragm folding and diaphragm damage not easily occurs after low temperature reliability.

An object is to provide a crosslinkable resin composition which does not easily cause an increase in the pressure in an extruder charged with the crosslinkable resin composition, and with which an insulating coating layer can be continuously formed by extrusion molding for a long time, thereby realizing an increase in the production unit of an electric wire/cable.

A crosslinkable resin composition of the present invention contains 100 parts by mass of an ethylene-based resin (A), a stabilizer (B) containing 0.001 to 0.5 parts by mass of a hindered amine light stabilizer (B3) having a melting point or glass transition point of 100° C. or less, and 0.5 to 3.0 parts by mass of an organic peroxide (C). All compounds contained in the stabilizer (B) have a molecular weight of 1,500 or less.

A production method comprising: (a) a step of melt-mixing a base resin containing a chlorinated polyethylene; an organic peroxide, an inorganic filler, and a silane coupling agent, in specific ratios, at a temperature equal to or higher than a decomposition temperature of the organic peroxide, to prepare a silane master batch; (b) a step of mixing the silane master batch obtained in the step (a) with a silanol condensation catalyst, and then forming the resultant mixture; and conducting at least one of the melt-mixing in the step (a) and the mixing in the step (b) is performed in the coexistence of a chloroprene rubber or a polyvinyl chloride; a heat-resistant chlorine-containing crosslinked resin formed body produced by the method, a silane master batch, a mixture and formed body thereof, and a heat-resistant product.

Rubber compound for the preparation of a tread portion of a pneumatic tyre comprising at least a cross-linkable unsaturated chain polymer base, a filler and a vulcanization system and a wax composed of at least 50% by weight of nonacosanediols.

A resin composition comprises a prepolymer of crosslinking agent and benzoxazine resin and a maleimide resin. The resin composition may be used to make various articles, such as a prepreg, a resin film, a resin-coated copper, a laminate or a printed circuit board, and achieves improvements in at least one, more or all of the properties including laminate reflow shrinkage, T288 thermal resistance, ten-layer board T300 thermal resistance, dissipation factor, copper foil peeling strength, and resin filling property in open area.

Disclosed is a micropump for delivery of a fluid. The micropump comprises body comprising metering chamber for receiving fluid and groove, and nozzle attached to metering chamber for delivering fluid. A capillary delivers fluid into metering chamber, and piston operates to move axially inside metering chamber. Axial movement of first end of piston (namely, piston face) along path between second end and first end of metering chamber delivers fluid through nozzle. Moreover, groove radially surrounds piston and has common axis with piston. The groove comprises sealing ring operable to move inside groove based on axial movement of piston. The sealing ring is in contact with piston and body. The sealing ring is manufactured using a rubber composition comprising hydrogenated nitrile butadiene rubber (HNBR), and carbon black.

An object of the present invention is to provide a golf ball having excellent durability. The present invention provides a golf ball comprising a core and at least one cover layer covering the core, wherein the core is formed from a core rubber composition containing (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a hindered phenol compound, and (b) the co-crosslinking agent and (d) the hindered phenol compound are blended in the core rubber composition such that the following expression (1) is satisfied:
0.04≤HF/B≤0.35  (1) in the formula (1), HF=a number of OH functional group in one molecule of (d) the hindered phenol compound×an amount of (d) the hindered phenol compound (mole) with respect to 100 parts by mass of (a) the base rubber, and B=an amount of (b) the co-crosslinking agent (mole) with respect to 100 parts by mass of (a) the base rubber.