Patent ID: 6576707
Filing Date: 2003-06-10
Classification: A63B,C08L

Abstract:
A multi-piece solid golf ball comprising a core, an inner cover formed on the core and an outer cover covering the inner cover, whereinthe inner cover has a Shore D hardness of 30 to 62, and is formed from an inner cover composition comprising (a) 50 to 95 parts by weight of ethylene-(meth)acrylic acid copolymer ionomer resin, and (b) 5 to 50 parts by weight of thermoplastic elastomer formed from a polymer alloy of an polyolefin with a block copolymer having styrene block, based on 100 parts by weight of a base resin, and the block copolymer having styrene block is selected from the group consisting of styrene-butadiene-styrene block copolymer (SBS), hydrogenation product of SBS, styrene-isoprene-styrene block copolymer (SIS), hydrogenation product of SIS, styrene-isoprene-butadiene-styrene block copolymer (SIBS), and hydrogenation product of SIBS, the outer cover is formed from an outer cover composition comprising ionomer resin as a main component, and has a Shore D hardness of 58 to 68, and the hardness of the outer cover is higher than that of the inner cover.