Bridgestone Corporation

E.i. Dupont De Nemours and Company

Shin-etsu Chemical Co., Ltd.

Daikin Industries, Ltd.

Daiken Industries, Ltd.

Masashi Yano

Daisuke Ota

Shuichi Okutsu

Tsutomu Nakamura

Tsuneo Kimura

Masaki Tanaka

Munenao Hirokami

Minoru Igarashi

Masahiko Minemura

Yasuyoshi Kawaguchi

Masayuki Yoshida

Yoshio Nohara

Yo Uchida

Satoru Uno

A rubber composition which contains (A) an organosilicon compound represented by formula (1) and gives a cured object satisfying desired fuel (or power)-saving tire properties. (Rrepresents an alkyl or aryl group, Rrepresents an alkyl or aryl group, e, f, and g each indicate a number larger than 0 and satisfy g/(e+f+g)<0.05, and m is an integer of 1-3.)

Rubber composition and organosilicon compound

A fluorine rubber composition that provides high tensile strength and high elongation after vulcanization mutually compatible and from which favorable mechanical characteristics are obtained even in a high-temperature environment; and a bladder for tire production, which is manufactured using the same are provided. The fluorine rubber composition includes a rubber component containing a fluorine rubber and carbon black, wherein the carbon black has a specific surface area by nitrogen adsorption (N2SA) of 25 m2/g or more and not more than 180 m2/g and a dibutyl phthalate (DBP) absorption amount of 60 mL/100 g or more and not more than 180 mL/100 g; and in a kneading step (A) of compounding the carbon black in the rubber component, an average shear rate of a rotor surface of a kneading machine is 100 (1/sec) or more, and a kneading maximum temperature Tm is 120&#xb0; C. or higher and not higher than 200&#xb0; C.

Fluorine rubber composition and bladder for tire production

A fluoro rubber composition which is able to make both a high tensile strength and a high elongation at break after vulcanization compatible with each other and from which favorable mechanical characteristics are obtained even in a high-temperature environment; and a bladder for tire fabrication, which is manufactured using the same are provided. The fluoro rubber composition includes a rubber component containing a fluoro rubber and carbon black, wherein in a dynamic viscoelasticity test of an unvulcanized rubber by a rubber process analyzer (RPA) (measurement temperature: 100&#xb0; C., measurement frequency: 1 Hz), a difference &#x3b4;G' (G&#x2032;(1%)&#x2212;G&#x2032;(100%)) between a shear modulus G&#x2032; (1%) at the time of a dynamic strain of 1% and a shear modulus G&#x2032; (100%) at the time of a dynamic strain of 100% is 120 kPa or more and not more than 3,000 kPa.

Fluoro-rubber composition and bladder for tire fabrication

In a method for kneading a silane coupling agent-blended rubber composition prepared by blending a natural rubber and/or a diene group synthetic rubber with silica and a silane coupling agent, a coupling reaction of the silica with the silane coupling agent is carried out in a temperature range of 130 to 140.degree. C.

Method for kneading silane coupling agent-blended rubber composition

Method and apparatus for reducing a shrinkage amount of a rubber member (51) which is comprised of a rubber (3) extruded from an extruder (1). At least one vibrator unit (10a, 10b) applies vibration to the extruded rubber (3) so as to increase the shrinkage speed of the extruded rubber (3) and cause a sufficient advance shrinkage of the extruded rubber within the extrusion train (1), thereby reducing a posterior shrinkage amount of the rubber member (51). An adjustable thermoregulator (30) maintains the extruded rubber (3) at a controlled temperature during application of vibration.

Method for reducing shrinkage of extruded rubber

The stain resistant cover composition of the present invention for colored rubber part of a tire is characterized by that it comprises water of 100 parts by weight, polyvinyl alcohol of 1.0 to 50 parts by weight, a vinyl acetate resin emulsion of 15 to 150 parts by weight (solid content), a surfactant of 0.5 to 5.0 parts by weight, and a silicon oil of 0.5 to 5.0 parts by weight. The stain resistant protective film of the present invention for colored rubber part of a tire is used as a stain resistant protective film for a colored portion in the side wall part of a tire, wherein the above protective film comprises polyvinyl alcohol, a vinyl acetate resin emulsion, a surfactant, and a silicon oil. The present invention can provide a stain resistant cover composition for colored rubber part of a tire used for preventing the colored part (side wall) of a tire from being stained by antioxidants bleeding from other tires, or dust and being scratched by contact with tires when rubber tires are transported or stored as they are piled up, and a protective film therefor.

Stain resistant cover composition for colored rubber part tire and

Growing community of inventors

Kodaira, Japan

Masashi Yano