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| Reduction of optical brightener migration in polyolefin coated paper bases |
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| Resin denture base molding apparatus |
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Golf ball
| Details |
Inventors: Cavallaro, Christopher; Rajagopalan, Murali; Pasqua, Jr., Samuel A.; Boehm, Herbert C.; Harris, Kevin M.;
Assignee: Acushnet Company (Fairhaven, MA)
Primary Examiner: Marlo; George J.
Assistant Examiner:
Attorney, Agent or Firm: Pennie & Edmonds LLP
The present invention is directed towards a multi-layer golf ball which comprises a core, a cover layer, and a mantle layer disposed between the core and cover layer. The core has a PGA compression less than about 70, the mantle layer has a flexural modulus of less than about 10,000 psi, and the cover layer has a flexural modulus greater than about 75,000 psi. |
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DETAILED DESCRIPTION The present invention is directed towards a multi-layer golf ball which provides a softer feel similar to a conventional wound ball, while also providing the distance, durability and relative ease of manufacturing of a conventional two piece ball.
Generally, the prior art has been directed at making golf balls perform like a three piece ball by providing a softer cover.
The present invention is directed to a golf ball that has durability, a low spin rate and substantial distance more like a conventional two piece ball, but has a soft feel by using a soft mantle layer and core.
The present invention is further directed towards a multi-layer golf ball which comprises a core with one or more layers; at least one cover layer; and one or more mantle layers disposed between the core and cover layer, wherein the core is comprised of a polybutadiene rubber having an activation agent of calcium oxide and wherein the mantle layer comprises thermoplastic copolyetherester block copolymer, thermoplastic copolyesterester block copolymer, dynamically vulcanized thermoplastic elastomer, styrene-butadiene, styrene-isoprene and styrene-ixoprene elastomers with a functional group such as maleic anhydride or sulfonic acid, thermoplastic polyurethane, polymer made using a metallocene catalyst, or blends thereof and/or thermoset materials.
The present invention is still further directed to a multi-layer golf ball which comprises a core, at least one cover layer and at least one mantle layer disposed between the core and cover layer wherein properties such as the thickness, hardness, flexural modulus, tensile modulus, PGA compression or Bayshore resilience of the various layers is such as to provide a ball with distance performance characteristics and a soft feel.
The present invention is also directed to an improved multilayer golf ball having a softer golf ball core.
The composition of the golf ball core comprises a base mixture of polybutadiene, a metal salt diacrylate or dimethacrylate, preferably, zinc diacrylate in an amount of about 20 to 50 parts per hundred parts of polybutadiene, and a free radical initiator, to which calcium oxide (CaO) is added instead of zinc oxide as an activation agent in an amount sufficient to produce a golf ball core with the advantageous properties discussed below
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Nonmetallic Processes 
