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Multi-piece solid golf ballMulti-piece solid golf ball description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080153627, Multi-piece solid golf ball. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION
The present invention relates to a multi-piece solid golf ball composed of a core over which have been formed two or more covers. More specifically, the invention relates to a multi-layer golf ball which enables the distance to be increased due to the ball rebound and a spin rate-lowering effect while retaining a good feel on impact, and which achieves an improved scuff resistance on approach shots. There exists a desire recently for durability to repeated impact and for resistance to the formation of burrs (scuff resistance) on the surface of the ball arising from repeated impact with various types of clubs. Improvements in durability to cracking on impact and scuff resistance are of critical importance to the golfer as factors in the ability to use a ball for a long time. At the same time, golf balls which travel farther when played and have a soft feel on impact are very appealing to the player. Ball developers have in the past proposed a variety of balls with this in mind. Numerous disclosures have been made in the art that provide an improved flight performance and an improved control on approach shots by giving the ball a solid, multi-piece construction having two or more cover layers and by optimizing the hardnesses of the respective layers and the core deflection. Most such multi-piece solid golf balls include as a major component an ionomer resin-based outermost layer cover, but leave something to be desired in terms of their durability to repeated impact and their scuff resistance. Various attempts have been made to further enhance the durability to cracking and the flight performance. Examples include the art disclosed in JP-A 2006-87925, JP-A 2006-87924, JP-A 2005-296655 and JP-A 2005-296654. However, because the durability to cracking and flight performance of these prior-art golf balls is not yet sufficient, there remains room for further improvement. SUMMARY OF THE INVENTIONIt is therefore an object of the present invention to provide a multi-piece solid golf ball which has an improved durability to repeated impact and an improved scuff resistance without any loss in distance or in feel on impact. The inventor has conducted investigations on multi-piece solid golf balls having a basic construction that includes a core, an outermost layer cover and at least one intermediate layer therebetween, the primary focus of the investigations being to improve the resin material used in the outermost layer cover and to incorporate short organic fibers within the resin material. As a result, the inventor has discovered that the distance traveled by the golf ball can be increased owing to the ball rebound and a spin rate-lowering effect while yet retaining a good feel on impact, and that moreover the ball can be endowed with both an excellent durability to cracking on repeated impact and an excellent scuff resistance on approach shots. Accordingly, the invention provides the following multi-piece solid golf balls. [1] A multi-piece solid golf ball comprising a core, an outermost layer cover with a surface on which are formed a plurality of dimples, and one or more intermediate layer between the core and the cover, wherein at least one intermediate layer and the outermost layer cover are each formed primarily of an ionomer-containing thermoplastic resin, the resin of which the outermost layer cover is formed containing up to 20 wt % of a ternary copolymer ionomer and having formulated therein from 0.1 to 5.0 parts by weight of short organic fibers per 100 parts by weight of resin. [2] The multi-piece solid golf ball of [1], wherein the short organic fibers are made of a copolymer comprising a polyolefin component and a polyamide component.[3] The multi-piece solid golf ball of [1], wherein the outermost layer cover has a Shore D hardness of from 50 to 70, a thickness of from 0.5 to 2.0 mm and a specific gravity of from 0.91 to 1.03; the intermediate layer has a Shore D hardness of from 40 to 60, a thickness of from 0.5 to 2.0 mm, and a specific gravity of from 0.88 to 1.00; and the outermost layer cover and the intermediate layer have a combined thickness of from 1.0 to 4.0 mm. [4] The multi-piece solid golf ball of [1], wherein the cover has a specific gravity of from 1.0 to 1.3, and has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) of from 1.0 to 4.0 mm. [5] The multi-piece solid golf ball of [1], wherein the dimples have a diameter of from 2 to 6 mm and an overall volume of from 200 to 450 mm3.[6] The multi-piece solid golf ball of [1], wherein the intermediate layer is formed of a mixture comprising:
100 parts by weight of a resin component composed of, in admixture,
a base resin of (a) an olefin-unsaturated carboxylic acid random copolymer and/or a metal ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer mixed with (b) an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester ternary random copolymer and/or a metal ion neutralization product of an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester ternary random copolymer in a weight ratio between 100:0 and 0:100, and
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