Patent ID: 9415272
Filing Date: 2016-08-16
CPC Classification: A63B,C08G,C08L

Claim Text:
1. A multi-piece solid golf ball comprising: a core with a two-layer structure composed of an inner layer and an outer layer, and a cover of three or more layers which is formed over the core and includes an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and an outermost layer encasing the intermediate layer, wherein the core inner layer is formed primarily of one or more type of thermoplastic elastomer selected from the group consisting of polyester, polyamide, polyurethane, olefin and styrene-type thermoplastic elastomers, and has a material hardness, expressed in terms of Shore D hardness, of from 10 to 50; the core outer layer is formed of a rubber composition consisting primarily of a rubber material, and has a surface hardness, expressed in terms of Shore D hardness, of from 50 to 70; and the intermediate layer has a higher surface hardness (Shore D hardness) than the outermost layer, wherein the core, the envelope layer, the intermediate layer and the outermost layer have Shore D hardnesses which satisfy the following conditions: wherein the core and the envelope layer have thicknesses which satisfy the following condition: wherein the difference between the surface hardness of the core inner layer and the surface hardness of the core outer layer, the value expressed as (core outer layer surface hardness)−(core inner layer surface hardness), is set to a Shore D hardness value of from 1 to 39.