Abstract: A hollow golf ball having good shot feel at the time of hitting, while maintaining excellent flight performance, wherein the hollow golf ball has a hollow core having a hollow portion and one or more hollow core outer layers formed thereon, the hollow core outer layers having a core composition containing rubber, a resin or a mixture thereof, and a cover formed on the hollow core, and wherein the hollow portion has a diameter of 5 to 25 mm, the hollow core outer layer has a surface hardness of 71 to 91 in JIS-C hardness and a deformation amount of 2.0 to 3.5 mm when applying from an initial load of 10 kgf to a final load of 130 kgf on the core.

Abstract: The present invention provides a method for the production of a hollow golf ball, which has a perfect spherical hollow portion and possesses excellent durability and good shot feel at the time of hitting, without adversely affecting a good rebound performance. The present invention provides a method for producing a hollow golf ball comprising a hollow core (5) having a hollow center (2) and a hollow portion (1) and, optionally, at least one intermediate core layer (3) formed on the hollow center (2), and a cover (4) formed on the hollow core (5), wherein the step of producing the hollow center (2) comprises:(i) preparing a rubber composition for hollow center;(ii) forming a bowl-shaped half-shell from the rubber composition for the hollow center and vulcanizing only the inside of the half-shell; and(iii) bonding two of the half-shells together to form a complete sphere body which is then vulcanized to obtain the hollow center (2).

Abstract: 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:tan .delta.<-0.0018.times..DELTA.V+0.34 (1)or a relation between a hardness Hs (IHRD) and a tan .delta. satisfy a relation represented by the formula:tan .delta.<-0.005.times.Hs+0.42 (3).