Patent ID: 6579939
Filing Date: 2003-06-17
Classification: A63B

Abstract:
A golf ball comprising a core, an intermediate layer, and a cover, said intermediate layer being formed by a resin composition,said resin composition comprising: 5 to 95 weight % of a polyester block copolymer (A) and 95 to 5 weight % of an ionomer resin (B); and a (polyester-aromatic vinyl based copolymer) block copolymer (C), which is mixed with both said polyester block copolymer (A) and said ionomer resin (B) in an amount of 1 to 40 parts by weight on the basis of 100 parts by weight of the total of said polyester block copolymer (A) and said ionomer resin (B); wherein said polyester block copolymer (A) mainly contains a high-melting point crystalline polymer segment (a1) composed of a crystalline aromatic polyester unit, and a low-melting point polymer segment (a2) composed of an aliphatic polyether unit and/or an aliphatic polyester unit; said ionomer resin (B) is obtained by neutralizing a copolymer mainly containing an &agr;-olefine (b1) and an &agr;,&bgr;-unsaturated carboxylic acid (b2) having 3 to 8 carbon atoms with at least one metal ion (b3) selected from univalent, divalent, and trivalent metal ions; and said (polyester-aromatic vinyl based copolymer) block copolymer (C) contains a block (c1) composed of a polyester, and at least one block (c2) selected from block or random copolymers containing aromatic vinyl based monomers and conjugated dienes and/or hydrogenated products thereof.