Kraton Polymers U.S. LLC

Cariflex Pte. Ltd.

Fumio Naito

Yoshikatsu Nakazawa

Norio Masuko

Arwin W Van Der Waal

In order to provide a rubber composition having high transparency, toughness and heat-resisting property, the present invention can provide a composition comprising a neodymium-catalyzed isoprene rubber (IR) component; and a rubber polymer (RB) component selected from the group consisting of BR, 1,2-polybutadiene rubber, and SBR, wherein the amount of IR is from about 5 to 95 mass parts with the proviso that the total amount of IR and RB is 100 mass parts, wherein the composition is substantially free of silica, wherein the composition has haze of less than about 20%, and wherein the composition has Type A Durometer hardness (0 sec) of about 30 or more.

Transparent, tough and heatproof rubber composition comprising neodymium-catalyzed isoprene component, and manufacturing process for the same

The present invention provides a process for forming an article from a diene rubber, comprising: providing a raw diene rubber substance comprising 1,2-polybutadiene rubber component; adding to the raw diene rubber substance a peroxide as a vulcanizing agent; softening the raw diene rubber at a first temperature of not more than 200&#xb0; C.; vulcanizing the diene rubber at a second temperature of not more than 200&#xb0; C., with contacting the diene rubber to an ambient atmosphere; and forming from the vulcanized diene rubber an article.

Diene rubber composition configured to be vulcanized at lower temperature; and manufacturing process of rubber article from the same

In order to provide a rubber composition having high transparency and toughness, the present invention can provide a crosslinked rubber composition, being substantially free of silica, comprising a first olefin polymer having refractive index of between 1.500 to 1.525 at 23 degree C.; and a second olefin polymer which is different from the first olefin polymer, wherein the composition has haze of 20% or less on 2 mm thick sheet, measured according to JIS K7136, and wherein the composition has Type A Durometer hardness (0 sec) of 35 or more, measured according to JIS K6253.

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Ibaraki, Japan

Fumio Naito