Abstract: Golf ball compositions including a rosin-modified polymeric composition including a conventional ionomer, acid copolymer, highly neutralized polymer, or other suitable polymer that has been modified with a rosin material to impart stiffness through increasing the flexural modulus of the material.

Abstract: The present invention is directed to a golf ball having at least one layer formed from a moisture resistant composition having a moisture vapor transmission rate of 12.5 g·mil/100 in2/day or less, a flexural modulus of from 50 kpsi to 70 kpsi, and comprising a highly neutralized acid polymer, wherein the highly neutralized acid polymer is produced by a process comprising contacting the acid polymer with a sufficient amount of a lithium-based cation source, in the presence of a melt flow modifier, to increase the level of neutralization of the copolymer to at least 70%. Golf balls of the present invention include one-piece, two-piece, multi-layer, and wound golf balls. The composition may be present in any one or more of a core layer, a cover layer, or an intermediate layer.

Abstract: The present invention is directed to a golf ball having at least one layer formed from a moisture resistant composition having a moisture vapor transmission rate of 12.5 g·mil/100 in2/day or less, a melt flow index of 1.0 g/10 min or higher, and comprising a highly neutralized acid polymer. Golf balls of the present invention include one-piece, two-piece, multi-layer, and wound golf balls. The composition may be present in any one or more of a core layer, a cover layer, or an intermediate layer.

Abstract: Golf ball compositions including a rosin-modified polymeric composition including a conventional ionomer, acid copolymer, highly neutralized polymer, or other suitable polymer that has been modified with a rosin material to impart stiffness through increasing the flexural modulus of the material.