Kuraray Co., Ltd.

Amyris, Inc.

Yosuke Uehara

Kei Hirata

Daisuke Koda

Hiromitsu Sasaki

Masahiro Kato

Shota Suzuki

Nobuhiro Moriguchi

Yusuke Tanaka

Daisuke Konishi

Shigenao Kuwahara

Hiroshi Kanbara

Satoshi Motoda

Hidetaka Oonuma

Yoshikazu Ueno

Yu Nozasa

Shuhei Kaneko

Masahiro Kashioka

The invention provides a peroxide crosslinkable rubber composition including a hydrogenated nitrile rubber that is enhanced in scorch stability without deterioration in superior characteristics of crosslinked products of the composition. The invention also provides a crosslinked product of such a rubber composition. The rubber composition includes 100 parts by mass of a hydrogenated nitrile rubber (A), 5 to 100 parts by mass of a filler (B), 1 to 10 parts by mass of an organic peroxide (C), and 1 to 20 parts by mass of a liquid diene rubber (D) having a polystyrene-equivalent weight average molecular weight of 3,000 to 120,000 as measured by gel permeation chromatography (GPC).

Rubber compositions

A modified liquid diene rubber (A) has a functional group (a) derived from an acid anhydride, and satisfies all the requirements (I) to (III) below: (I) The functional group equivalent weight of the functional groups (a) is in the range of 400 to 3,500 g/eq. (II) The polystyrene-equivalent number average molecular weight (Mn) measured by gel permeation chromatography (GPC) is in the range of 5,000 to 20,000. (III) The melt viscosity at 38&#xb0; C. is not less than 3 Pa&#xb7;s and X (K) is not less than 6100 K wherein X is the slope of a linear line passing through two points in a graph in which the two points are values of melt viscosity &#x3b7; (Pa&#xb7;s) at 38&#xb0; C. and 60&#xb0; C. measured with a Brookfield viscometer which are plotted as Ln[&#x3b7;/(Pa&#xb7;s)] on ordinate versus 1/T (K) on abscissa (with the proviso that T is temperature (K)).

Modified liquid diene rubbers

A hydrogenated block copolymer prepared by hydrogenating a block copolymer that contains a polymer block (A) containing a structural unit derived from an aromatic vinyl compound, a polymer block (B) containing a structural unit derived from farnesene, and a polymer block (C) containing a structural unit derived from a conjugated diene except farnesene, wherein the block copolymer contains at least two above polymer blocks (A), at least one above polymer block (B) and at least one above polymer block (C), and wherein at least one above polymer block (B) is at the terminal, and the hydrogenation rate of the carbon-carbon double bond in the polymer block (B) and the polymer block (C) is 50 mol % or more.

Hydrogenated block copolymer

A thermoplastic elastomer composition comprising 100 parts by mass of a hydrogenated block copolymer (A) comprising a polymer block (a) consisting of a structural unit derived from an aromatic vinyl compound and a polymer block (b) comprising 1 to 100% by mass of a structural unit (b1) derived from farnesene and comprising 99 to 0% by mass of a structural unit (b2) derived from a conjugated diene other than farnesene, a mass ratio [(a)/(b)] of the polymer block (a) to the polymer block (b) being 1/99 to 70/30; and 5 to 300 parts by mass of a polar group-containing olefinic polymer (B), is excellent in flexibility and molding processability and capable of adhering to a ceramic, a metal, a synthetic resin, or the like even through a heat treatment at low temperatures (for example, 190&#xb0; C. or lower) without requiring a primer treatment or the like.

Thermoplastic elastomer composition, molded article, and adhesive agent

Provided is a polyolefin-based resin composition including a hydrogenated block copolymer (A) and a polyolefin-based resin (B), the hydrogenated block copolymer (A) being a hydrogenated product of a block copolymer including a polymer block (a) composed of a constitutional unit derived from an aromatic vinyl compound and a polymer block (b) containing 1 to 100% by mass of a constitutional unit (b1) derived from farnesene and 99 to 0% by mass of a constitutional unit (b2) derived from a conjugated diene other than farnesene; a mass ratio of the polymer block (a) and the polymer block (b) [(a)/(b)] being 1/99 to 55/45; 50 mol % or more of carbon-carbon double bonds in the polymer block (b) being hydrogenated; and a mass ratio of the polyolefin-based resin (B) and the hydrogenated block copolymer (A) [{polyolefin-based resin (B)}/{hydrogenated block copolymer (A)}] being 1/99 to 99/1. The polyolefin-based resin composition is favorable in flexibility and molding processability, excellent in weather resistance and whitening resistance, and also excellent in rigidity.

Polyolefin-based resin composition and molded body

The thermoplastic elastomer composition of the present invention is a thermoplastic elastomer composition including a hydrogenated block copolymer (A) and a softening agent (B), the hydrogenated block copolymer (A) being a hydrogenated product of a block copolymer including a polymer block (a) composed of a constitutional unit derived from an aromatic vinyl compound and a polymer block (b) containing 1 to 100% by mass of a constitutional unit (b1) derived from farnesene and 99 to 0% by mass of a constitutional unit (b2) derived from a conjugated diene other than farnesene; a mass ratio of the polymer block (a) and the polymer block (b) [(a)/(b)] being 1/99 to 70/30; 50 mol % or more of carbon-carbon double bonds in the polymer block (b) being hydrogenated; and a content of the softening agent (B) being 20 to 2,000 parts by mass on the basis of 100 parts by mass of the hydrogenated block copolymer (A).

Thermoplastic elastomer composition and molded body

The present invention relates to a hydrogenated block copolymer including a polymer block (A) containing a constitutional unit derived from an aromatic vinyl compound and a polymer block (B) containing from 1 to 100% by mass of a constitutional unit (b1) derived from farnesene and from 99 to 0% by mass of a constitutional unit (b2) derived from a conjugated diene other than the farnesene, in which 50 mol % or more of carbon-carbon double bonds in the polymer block (B) are hydrogenated.

Hydrogenated block copolymer and method for producing same

Provided are a tube which has good transparency, flexibility, and solvent adhesion, and also has excellent clamp resistance, anti-conglutination property, and kink resistance, and a medical device using the tube. Specifically provided are a tube produced by forming a resin composition into a tube shape, which contains a styrene-based thermoplastic elastomer (a) and a polypropylene-based resin (b) and does not contain a softening agent, in which: the elastomer (a) is a product prepared by hydrogenating a block copolymer including at least a polymer block (A) formed of an aromatic vinyl compound and a polymer block (B) formed of isoprene and/or 1,3-butadiene; the content of the polymer block (A) is 5 to 40 mass % before hydrogenation, the polymer block (B) has a hydrogenation ratio of 70% or more, and the polymer block (B) includes a 1,2-bond and a 3,4-bond at a content of 30 to 85 mol %; the mass ratio of the styrene-based thermoplastic elastomer (a) to the polypropylene-based resin (b) [(a)/(b)] is 90/10 to 40/60; and the tube has a ratio of a diffraction peak intensity [I(14)] at a scattering angle of 14&#xb0; to a diffraction peak intensity [I(15)] at a scattering angle of 15&#xb0; [I(14)/I(15)] of 1.4 or more in X-ray diffraction, and a medical device including the tube.

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Kamisu, Japan

Yosuke Uehara