Tokai Rubber Industries, Ltd.

Toyohisa Tohyama

Takehiko Taguchi

Takanori Sugiura

Norihito Kimura

Eisuke Asano

An antivibration rubber composition containing diene rubber (Component A) and silica (Component B). The amount of the Component B contained is set to a range from 10 to 100 parts by weight with respect to 100 parts by weight of the Component A. The Component B has the following properties, i.e., a surface silanol-group density of not less than 3.0 groups/nmas determined by the Sears titration method, an average particle size of not more than 10 &#x3bc;m, and a BET specific surface area of 15 to 60 m/g.

Antivibration rubber composition

A rubber part having an aluminum-based metal component including the metal component, a chemical film A formed on an outer peripheral surface of the metal component which is transformable following a squeezing of the metal component, an adhesive layer B formed on an outer peripheral surface of the chemical film A, and the rubber part formed on an outer peripheral surface of the adhesive layer B. The chemical film A includes zinc fluoride, molybdenum and aluminum fluoride, in which zinc of the zinc fluoride, the molybdenum and aluminum of the aluminum fluoride are present in a content ratio of zinc/molybdenum/aluminum=4.0 to 5.5/3.0 to 5.0/0.5 to 1.5 on a mass basis.

Rubber part having an aluminum-based metal component and method of producing the same

A rubber part having a metal fitting in which the metal fitting and the rubber part are integrated through an anti-corrosion chemical film formed on a surface of the metal fitting. The anti-corrosion chemical film is a zirconium-based chemical film that is harmless to human body and environment, and is transformable following the squeeze of the metal fitting. The rubber part having a metal fitting is produced by the steps of: degreasing an outer peripheral surface of the metal fitting, subjecting the surface to shot blasting treatment, degreasing the treated surface, and water washing the treated surface; forming a zirconium-based chemical film on the treated surface; water washing and drying an outer peripheral surface of the zirconium-based chemical film; forming an adhesive layer on the outer peripheral surface of the zirconium-based chemical film; and integrating the rubber part on the outer peripheral surface of the adhesive layer.

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Toyoake, Japan

Toyohisa Tohyama