Bridgestone Corporation

Bridgestone Tire Company Limited

Other

Bridgestone Sports Co., Ltd.

Setsuo Akiyama

Masato Yoshikawa

Kazuo Naito

Yukio Fukuura

Toshio Honda

Yukihiro Kusano

Hisanobu Monobe

Makoto Nakamura

Itsuo Tanuma

Masao Ogawa

Hikaru Ishikawa

Shinji Saitoh

Shiro Yoshida

Shigeki Ohkubo

Takeyuki Matsuda

Kazuo Tanaka

Minoru Takahashi

Shingo Kato

Masuhiro Kogoma

Satiko Okazaki

Yoshio Nohara

Tomio Oyachi

Nobumitsu Ohshima

Kazuo Naitoh

Fumihiro Matsuyama

Tomoko Inagaki

Mahito Fuji

Jingo Shirasaka

Shozo Ojima

Koichi Izuhara

Reclaimed rubber which is obtained through devulcanization and has excellent physical properties as a vulcanized material, and a process for producing the same are provided. In the reclaimed rubber obtained by devulcanizing vulcanized rubber, the proportion of sol is 80% or higher, and the peak top molecular weight of sol as determined by gel permeation chromatography (GPC) is 100,000 or less.

Reclaimed rubber and process for producing the same

A composite rubber article is obtained by joining a rubber composition based on a brominated p-methylstyrene/isobutylene copolymer to a different material such as a plastic, inorganic and metallic material through a di-, tri- or tetra-alkoxysilane compound. The copolymer is firmly joined to the different material. The invention is applicable to the manufacture of composite rubber articles such as tires, high-pressure hoses, and pneumatic springs.

Composite rubber article and method of making

A rubber composition comprising a rubber component and a di- or trialkoxysilane compound is joined to a surface-modified resin to form a resin/rubber laminate. The laminate typically forms a refrigerant carrying hose wherein the resin defines an inside surface.

Resin/rubber laminate

Only an outer surface of an unvulcanized rubber sheet is preliminarily crosslinked by irradiating an infrared ray or a far infrared ray to the unvulcanized rubber sheet prior to subsequent final vulcanization, whereby the occurrence of rubber spew and rubber flash is considerably suppressed at the vulcanization step.

Process and apparatus for surface treatment of unvulcanized rubber sheet

A surface treating method is described, which method comprising applying, between electrodes, a potential sufficient to cause corona discharge to occur in the presence of a gas which comprises molecules containing at least one atom selected from the group consisting of halogen atom, oxygen atom and nitrogen atom. The resultant corona discharge is applied to an object to be treated for the surface treatment of the object, said object being outside said electrodes. The excellent adhesive surface can be obtained when said object is separated from said electrodes at a distance in the range of 10 mm to 5 m.

Corona discharge surface treating method

A rubbery composite material comprising a substrate and a rubber composition bonded thereto is prepared by metallizing a substrate with a thin film of zinc, copper, cobalt or an alloy thereof by dry plating such as vacuum deposition, ion plating, DC magnetron sputtering, bipolar sputtering, and RF sputtering processes, and pressing a vulcanizable rubber composition to the metallized substrate under heat and pressure to effect vulcanization bonding.

Method for making rubbery composite materials by plating a plastic

Disclosed herein is a method for surface treatment which comprises subjecting an object for surface treatment to an atmospheric pressure plasma while rolling or floating said object in an insulating vessel fed with a prescribed gas and provided on the outside thereof or on both the outside and inside thereof with electrodes for voltage application and grounding, said atmospheric pressure plasma occurring upon application of a voltage to said electrodes. This method permits simple, certain, and uniform surface treatment of any objects in the form of lump or sphere. The surface treatment by the atmospheric pressure plasma does not need the apparatus to be evacuated. Therefore, it can be carried out in a simple apparatus without causing the object for surface treatment to release volatile matters. Disclosed also herein is a method for the surface treatment of vulcanized rubber with an atmospheric pressure plasma in the presence of an oxygen-containing gas and halogen containing gases. This method is simple and permits the surface treatment of vulcanized rubber in a clean environment. The surface treatment by this method provides the vulcanized rubber with a surface having better adhesion properties than the surface treatment with a low-pressure glow plasma. Moreover, the surface treatment is limited only to a very thin surface layer, with the vulcanized rubber itself remaining intact.

Method and apparatus for surface treatment

Crystalline N-methoxymethylated nylon is useful to form a coating on a rubber substrate. It is prepared by adding acid to N-methoxymethylated nylon and heat treating the mixture for crystallization.

Crystalline N-methoxymethylated nylon and nylon composition

A rubbery composite material comprising a substrate and a rubber composition bonded thereto is prepared by metallizing a substrate with a thin film of zinc, copper, cobalt or an alloy thereof by dry plating such as vacuum deposition, iron plating, DC magnetron sputtering, bipolar sputtering, and RF sputtering processes, and pressing a vulcanizable rubber composition to the metallized substrate under heat and pressure to effect vulcanization bonding.

Method for making rubbery composite materials by plating a metal

A process for producing a tubular rubber product such as a rubber hose and a rubber coupling in which a polyamide resin and/or polyester resin layer is formed to the main body of a tubular rubber product. The resin layer is formed either by coating an organic solvent-soluble nylon to the surface of the main body of the tubular rubber product applied with the surface treatment of a halogenoid compound, or by polyamide resin or polyester resin film having a softening point in the vulcanization temperature region and treated with an adhesive mainly comprising a resorcine-formaldehyde resin and a rubber latex or treated with an adhesive rubber mainly comprising a resorcine, a formaldehyde-forming substance and a vinylpyridine-butadiene-styrene copolymer rubber and then bonding under vulcanization onto the main body of the non-vulcanized tubular rubber product.

Method of making a tubular rubber product having a polyamide or

A process for producing a tubular rubber product such as a rubber hose and a rubber coupling in which a polyamide resin and/or polyester resin layer is formed to the main body of a tubular rubber product. The resin layer is formed either by coating an organic solvent-soluble nylon to the surface of the main body of the tubular rubber product applied with the surface treatment of a halogenoid compound, or by polyamide resin or by polyester resin film having a softening point in the vulcanization temperature region and treated with an adhesive mainly comprising a resorcine-formaldehyde resin and a rubber latex or treated with an adhesive rubber mainly comprising a resorcine, a formaldehyde-forming substance and a vinylpyridine-butadiene-styrene copolymer rubber and then bonding under vulcanization onto the main body of the non-vulcanized tubular rubber product.

Tubular rubber products

Method for treating golf ball surface which is made of balta resin, thermoplastic elastomer, ionomer resin or the like to unpolymerizable gas plasma and then applying usual coating in an apparatus adapted to expose the all over surface of the ball to said plasma. Owing to this treatment, exfoliation of the ball coating can unexpectedly sufficiently be prevented.

Method for treating golf ball surface with glow discharge plasma and

A sandwich glass having an intermediate layer formed of a photosensitive resin consisting mainly of an acryloyloxy group- or methacryloyloxy group-containing high polymer and at least one of acrylic acid, methacrylic acid and acryloyloxy group- or methacryloyloxy group-containing compound is excellent in the adhesion between the intermediate layer and the glass plates and has high impact absorbing ability, light resistance and heat resistance.

Sandwich glass

A composite composed of vulcanized rubber and thermoplastic resin which adheres tightly to the rubber can be obtained by treating the surface of the vulcanized rubber with at least one of halogen, halogen generating compound and halogenoid, and bonding melted polyamide resin, polyester resin, styrene series resin or acrylic resin to the above treated rubber surface region by the injection or extrusion molding.

Growing community of inventors

Sagamihara, Japan

Setsuo Akiyama