Ishikawa Tekko Kabushiki Kaisha

Mitsubishi Chemical Mkv Company

Masaji Yamamori

Masabumi Oshima

Tadayoshi Shirai

A vinyl chloride resin elastomer composition comprises 100 parts by weight of a resin mixture comprising from 50 to 95 parts by weight of a vinyl chloride resin and from 5 to 50 parts by weight of a chlorinated polyethylene; from 20 to 400 parts by weight of an acrylonitrile-butadiene rubber containing a tetrahydrofuran-insoluble crosslinking component; and from 10 to 300 parts by weight of a plasticizer.

Vinyl chloride resin elastomer composition

A method for providing a dust-proof boot for a protruding equipment shaft of the type including a pair of spaced apart annular grooves. The boot includes an expandable central belly portion, a pair of restricted diameter attachment ring portions adapted to be received in the shaft grooves, and a pair of connecting portions connecting the attachment ring portions to the belly portion. It is formed by first forming a parison on a male die. The parison includes preformed attachment ring portions and connecting portions, at least one of which includes an inwardly protruding annular ridge member which is received in a mating recess in the die. The parison and the male die are inserted into a female blow-molding, die, with the preformed attachment ring portions and connecting portions caught and supported between the male and female dies. The belly portion of the boot is next formed by blow molding, during which step the ridge members are urged into sealing relation with wall portions of the male die grooves, thus preventing distortion of the preformed attachment ring portions.

Growing community of inventors

Nagoya, Japan

Masaji Yamamori