An object of the present invention is to provide a golf ball which is superior in durability to a golf ball having an ionomer resin cover which has conventionally been used. Another object of the present invention is to provide a golf ball using a non-petroleum based material. The golf ball of the present invention comprises a core and a cover covering the core, wherein at least either the core or the cover includes, as a resin component, a polyester resin containing a non-petroleum based material as a constitutional component.
1. A golf ball comprising a core and a cover covering the core,
wherein the cover contains a mixture of a copolymer polyester resin and an ionomer resin as a resin component and an expoxy group modified methacrylic resin as a compatibilizer;
wherein the copolymer polyester resin has, as a constitutional components, a dicarboxylic acid, a diol, and a hydroxyl carboxylic acid, and at least one of the dicarboxylic acid, the diol, and the hydroxyl carboxylic acid is a non-petroleum based material,
wherein the copolymer polyester resin is composed of succinic acid as the dicarboxylic acid, butanediol as the diol, and lactic acid as the hydroxyl carboxylic acid; and,
the copolymer polyester resin has slab hardness of 70 or less in shore D hardness.
2. The golf ball according to claim 1 , wherein the compatibilizer is at least one of methyl methacrylate-glycidyl methacrylate copolymer, ethylene-glycidyl methacrylate copolymer, and ethylene-methyl methacrylate-glycidyl methacrylate copolymer.
3. A golf ball comprising a core and a cover covering the core,
wherein the cover contains a mixture of a copolymer polyester resin and an ionomer resin component as a resin component and an expoxy group modified (meth)acrylic resin as a compatibilizer;
wherein the copolymer polyester resin has, as a constitutional components, a dicarboxylic acid, a diol, and hydroxyl carboxylic acid, and at last one of the dicarboxylic acid, the diol, and the hydroxyl carboxylic acid is a non-petroleum based material,
wherein the copolymer polyester resin is composed of succinic acid and adipic acid as the dicarboxylic acid, butanediol as the diol, and lactic acid as the hydroxy carboxylic acid; and
the copolymer polyester resin has slab hardness of 70 or less in shore D hardness.
4. The golf ball according to claim 3 , wherein the compatibilizer is at least one of the methyl methacrylate-glycidyl methacrylate copolymer, ethylene-glycidyl methacrylate copolymer, and ethylene-methyl methacrylate-glycidyl methacrylate copolymer.