Sumitomo Rubber Industries Limited

Sri Sports Limited

Sumitomo Seika Chemicals Co., Ltd.

Satoshi Mano

Seigou Sakagami

Masatoshi Yokota

Kuniyasu Horiuchi

Kiyoto Maruoka

Akihiko Hamada

Tetsuo Yamaguchi

Akihiro Nakahara

Michio Suzuki

Atsuko Ochi

The present invention provides a solid golf ball having exceptional rebound characteristics and flight performance, as well as good shot feel. The present invention relates to a solid golf ball comprising at least one layer of a core, and at least one layer of a cover formed on the core, wherein at least one layer including the inmost layer of the core is formed by vulcanizing a rubber composition comprising a base rubber, a co-crosslinking agent, a vulcanization initiator and a filler, the core has a center hardness in JIS-C hardness of 40 to 60, a surface hardness in JIS-C hardness of 80 to 95 and a hardness difference (B&#x2212;A) between a hardness in JIS-C hardness at a distance of 5 mm from the center point of the core (B) and the center hardness (A) of not less than 1 to less than 10.

Solid golf ball

The present invention provides a solid golf ball which gives a superior shot feeling to the golfer and exhibits stabilized repulsion performance when it is hit at any head speed. The solid golf ball of the present invention comprises a core containing at least one layer which is molded by vulcanizing the rubber composition including: (a) a base rubber, (b) a co-crosslinking agent, (c) an organic peroxide, and (d) a polysulfide compound represented by the formula:wherein at least one of Rto Rand at least one of Rto Rare each Br, and n is an integer not less than 2.

The present invention provides a solid golf ball having exceptional rebound characteristics and flight performance, as well as good shot feel. The present invention relates to a solid golf ball comprising at least one layer of a core, and at least one layer of a cover formed on the core, wherein at least one of the layers of the core is formed by vulcanizing and press-molding a rubber composition comprising a base rubber, co-crosslinking agent, organic peroxide, filler and specific organic sulfur compound which contains substituent groups having a substituent constant of not less than 1.42.

A thread rubber for thread wound golf balls having a high impact resilience and high strength, wherein the thread rubber is obtained by vulcanizing a rubber composition which comprises (a) a rubber component selected from the group consisting of natural rubber, a synthetic high-cis-polyisoprene rubber and a mixture thereof, (b) at least one specific diaryl disulfide, (c) a vulcanizing agent, and (d) antioxidant; the compound (b) being present in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the rubber component (a).

Growing community of inventors

Kobe, Japan

Satoshi Mano