Bando Chemical Industries, Inc.

Akinori Fujiwara

Katsuhiko Hata

Hiroshi Matsuoka

Susumu Onoe

Tsutomu Shioyama

Michio Tanaka

Kenji Kusaka

A process of bonding aromatic polyamide fibers to rubber compounds is disclosed, which comprises:

Process of bonding aromatic polyamide fibers to rubber compounds

A process of bonding aromatic polyamide fibers to rubber compounds is disclosed, which comprises: the first step of treating fibers with an aqueous mixture comprising a resorcinol/formalin resin and a latex of a polymer containing halogens in amounts of not less than 45% by weight based on the polymer; the second step of treating the fibers with an aqueous adhesive composition comprising a resorcinol/formalin resin and a latex of an adhesive rubber which is compatible with the rubber in the rubber compound; and the third step of placing the fibers in close contact with the rubber compound and vulcanizing the rubber together with the fibers. A second process is further disclosed wherein in the second step, the fibers are treated with an adhesive solution comprising at least one activating agent selected from the group consisting of polyisocyanates and polyepoxy compounds in organic solvents.

A woven fabric for covering a tooth part formed on a belt body of a synchronous belt is woven with a lengthwise yarn and a widthwise yarn. The lengthwise yarn is made of a crimped yarn of synthetic fiber or a covering yarn in which a crimped yarn of synthetic fiber is wound around an elastic cord yarn. The widthwise yarn is made of a spun yarn of synthetic fiber or meta-linked type aromatic polyamide fiber. The widthwise yarn expose more to the woven fabric surface than the lengthwise yarn. Thus, the belt life is lengthened and the noise reduced.

Synchronous belt

A method of bonding fibers to hydrogenated nitrile rubber which comprises:

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Kobe, Japan

Akinori Fujiwara