A golf ball is provided that is soft and thus provides an excellent shot feeling, the golf ball exhibiting less deterioration in impact resilience and a superior spin characteristic. The golf ball is further superior in burr resistance and scuff resistance when being shot by an iron club. The golf ball is formed of a core and a cover surrounding the core and the cover composition contains a polymer component including 10 to 80 parts by weight of an ethylene-(meth)acrylic acid copolymer-based ionomer resin (Component A), 0 to 60 parts by weight of an ethylene-(meth)acrylic acid-(meth)acrylic acid ester ternary copolymer-based ionomer resin (Component B), and 5 to 60 parts by weight of a thermoplastic elastomer containing a styrene block (Component C). The cover composition has a shore D hardness of 40 to 60.
1. A golf ball including a core and a cover surrounding said core, said cover formed of a cover composition containing a polymer component including 10 to 80 parts by weight of an ethylene-(meth)acrylic acid copolymer-based ionomer resin (Component A), greater than 0 and up to 60 parts by weight of an ethylene-(meth) acrylic acid-(meth) acrylic acid ester ternary copolymer-based ionomer resin (Component B), and 5 to 60 parts by weight of a thermoplastic elastomer which comprises a polymer alloy of a polymer containing a styrene block and a polyolefin (Component C), said cover composition having a shore D hardness of 40 to 60.
2. The golf ball according to claim 1 , wherein
said polymer containing the styrene block is a styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene-isoprene-butadiene-styrene block copolymer (SIBS), or hydrogenated copolymers of respective copolymers.
3. The golf ball according to claim 1 , wherein
said polymer containing the styrene block is a styrene-ethylene-butadiene-styrene block copolymer (SEBS).
4. The golf ball according to claim 1 , wherein
said thermoplastic elastomer has a shore A hardness of at most 95.
5. The golf ball of claim 1 , wherein component A has a shore D hardness of 55 to 70 and a flexural modulus of 200 to 500 MPa.
6. The golf ball of claim 1 , wherein component B has a shore D hardness of 30 to 55 and a flexural modulus of 10 to 100 MPa.
7. The golf ball of claim 1 , wherein component A has a composition ratio of ethylene and the acrylic acid and or methacrylic acid constituting the copolymer of 70 to 95% by weight ethylene and 5 to 30% by weight of the acrylic acid or methacrylic acid.
8. The golf ball of claim 1 , wherein component B has a composition ratio of ethylene, an acrylic acid or methacrylic acid, and an acrylic acid ester of methacrylic acid ester constituting the terpolymer of 70 to 85% by weight ethylene, 5 to 20% by weight of acrylic or methacrylic acid and 10 to 25% by weight of acrylic or methacrylic acid ester.
9. The golf ball of claim 1 , wherein the styrene in the copolymer is 10 to 50% by weight.
10. The golf ball of claim 1 , wherein component B is present in an amount of 15 parts to 40 parts by weight.
11. The golf ball of claim 10 , wherein component B has a Shore D hardness of 30 to 55 and a flexural modulus of 10 to 100 Mpa.