Zeon Corporation

Chikara Katano

Tadashi Nakamura

Akira Tsukada

Kazuhiro Ejiri

Tomonori Nakashima

Sayaka Inoue

Masato Sakamoto

Shinsuke Sugawara

Yasuaki Watanabe

Kentaro Ono

A nitrile group-containing highly saturated copolymer rubber composition containing a nitrile group-containing highly saturated copolymer rubber (A) having a Mooney viscosity [ML, 100&#xb0; C.] of 50 to 200, a nitrile group-containing highly saturated copolymer rubber (B) having a Mooney viscosity [ML, 100&#xb0; C.] of 5 to 45, and staple fibers (C) having an average fiber length of 0.1 to 12 mm is provided. According to the present invention, a nitrile group-containing highly saturated copolymer rubber composition which can give cross-linked rubber which is extremely high in tensile stress and is excellent in low heat buildup property and has good workability can be provided.

Nitrile group-containing highly saturated copolymer rubber composition

A method for producing a hydrogenated conjugated diene polymer latex includes: a hydrogenation step of dissolving or dispersing a hydrogenation catalyst containing a platinum group element in a latex of a conjugated diene polymer to hydrogenate a carbon-carbon unsaturated bond in the polymer; an insoluble complex formation step of complexing the platinum group element with a complexing agent to form an insoluble complex; and an insoluble complex removing step of continuously feeding the latex which has undergone the insoluble complex formation step to a centrifuge machine and continuously performing a centrifugation operation to continuously remove the insoluble complex from the latex and continuously discharge the insoluble complex out of the centrifuge machine. In the insoluble complex removal step the feed rate of the latex to the centrifuge machine is adjusted to 0.5 to 15 m/hour, and the centrifugal force in the centrifugation operation is adjusted to 200 to 10,000 G.

Method for producing hydrogenated conjugated diene polymer latex

A nitrile group-containing copolymer rubber containing &#x3b1;,&#x3b2;-ethylenically unsaturated nitrile monomer units in 10 to 60 wt % and having a weight average radius of gyration of 10 to 100 nm in range is provided. According to the present invention, a nitrile group-containing copolymer rubber excellent in processability and able to give cross-linked rubber excellent in normal physical properties can be provided.

Nitrile group-containing copolymer rubber, cross-linkable rubber composition, and cross-linked rubber

A nitrile copolymer latex composition containing a latex of a nitrile copolymer rubber (A) having &#x3b1;,&#x3b2;-ethylenically unsaturated nitrile monomer units in 10 to 75 wt %, conjugated diene monomer units in 5 to 89.9 wt %, and cationic monomer units and/or monomer units able to form cations in 0.1 to 20 wt %, an inorganic filler (B) having an aspect ratio of 30 to 2,000, and a plasticizer (C) having an SP value by the HOY method of 8 to 10.2 (cal/cm), wherein a content of said plasticizer (C) is 0.1 to 200 parts by weight with respect to said nitrile copolymer rubber (A) as 100 parts by weight is provided.

Growing community of inventors

Tokyo, Japan

Chikara Katano