| 主权项 |
1. A three-layer golf ball having a compression of from 30 to 90 and consisting essentially of:
a center having a diameter of from 1.25 inches to 1.55 inches, a center Shore C hardness (Hcenter) of from 45 to 70, an outer surface Shore C hardness (Hcore surface) of from 80 to 95, and formed from a rubber composition; an intermediate layer having an outer surface Shore C hardness (Hintermediate surface) of from 55 to 80, a thickness of from 0.020 inches to 0.120 inches, and formed from a highly neutralized polymer composition having a material hardness of from 50 Shore C to 80 Shore C and comprising the reaction product of:
an acid copolymer of ethylene and an α,β-unsaturated carboxylic acid, optionally including a softening monomer selected from the group consisting of alkyl acrylates and methacrylates;a non-acid polymer selected from the group consisting of polyolefins, polyamides, polyesters, polyethers, polyurethanes, metallocene-catalyzed polymers, single-site catalyst polymerized polymers, ethylene propylene rubber, ethylene propylene diene rubber, styrenic block copolymer rubbers, alkyl acrylate rubbers, and functionalized derivatives thereof;a cation source; andoptionally, an organic acid or salt thereof;wherein the acid copolymer is present in an amount of from 20 wt % to 90 wt % and the non-acid polymer is present in an amount of from 10 wt % to 80 wt %, based on the combined weight of the acid copolymer and the non-acid polymer; andwherein greater than 70% of all acid groups present in the highly neutralized polymer composition are neutralized; and an outer cover layer having an outer surface Shore C hardness (Houter cover surface) of from 82 to 99 and a thickness of from 0.020 inches to 0.080 inches; wherein Hcenter<Hintermediate surface<Hcore surface<Houter cover surface; and wherein the difference between Hcore surface and Hintermediate surface is from 5 to 30. |
