Sumitomo Rubber Industries Limited

Taketo Matsuki

Akihiro Nakahara

Ichiro Tominaga

Kazuhisa Fushihara

Tetsuo Yamaguchi

Kunio Niwa

Seiji Tomono

Hiroomi Matsushita

Disclosed is a structural material excelling in lightness of weight, strength, flexural modulus and other properties, being made from polyamide resin reinforced with continuous fiber and/or long filament reinforcing material. This structural material can be fabricated by a monomer casting method by arranging said fiber reinforcing material preliminarily in a desired shape, putting it into a mold, pouring molten &ohgr;-lactams containing a polymerization catalyst and an initiator into said mold, and heating to obtain polyamide resin.

Structural material and process for its production

There is provided an offset blanket which is particularly superior in paper discharging properties at the time of printing, comprising a supporting layer and a surface printing layer provided on the supporting layer, and the surface printing layer is a rubber layer wherein a volume change .DELTA.V (%) and a tan .delta. satisfy a relation represented by the formula:

Printing offset blanket

Monomer resin

A three piece solid golf ball having improved rebound characteristics and a higher initial velocity which includes a center portion, an outer layer disposed over the center portion, and a cover disposed over the outer layer. The outer layer is formed from a rubber composition containing a base rubber, and has a base rubber volume content ratio of at least 0.65. The rubber composition of the outer layer further contains a gravity filler with a high specific gravity such that the outer layer has a higher specific gravity than the center, wherein the difference in specific gravity between the outer layer and the center varies from 0.15 to 0.8 for a small size golf ball and from 0.15 to 0.45 for a large size golf ball. The gravity filler may be selected from tungsten, tungsten carbide, molybdenum, lead, lead dioxide, nickel, or copper.

Multi-piece solid golf ball

The present invention provides a three-piece golf ball having an excellent rebound coefficient without any damage to the durability of the golf ball by controlling the diameters, the specific gravities and the hardnesses of central core and outer layer of the solid core. The golf ball of the present invention is a three-piece solid golf ball produced by covering a two-piece solid core made of a resilient elastomeric material, composed of a central core and an outer layer, with a cover made of an impact and wear resistant material, in which:

Three-piece solid golf ball

A cover composition for golf balls having an improved impact resistance which comprises an ionomer resin and 1 to 15 parts by weight of a linear low density polyethylene per 100 parts by weight of the ionomer resin.

Growing community of inventors

Nishinomiya, Japan

Taketo Matsuki