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(12) Patent Application Publication (10) Pub. No.: US 2013/0157779 A1 Kim Et Al

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(12) Patent Application Publication (10) Pub. No.: US 2013/0157779 A1 Kim Et Al US 2013 O157779 A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2013/0157779 A1 Kim et al. (43) Pub. Date: Jun. 20, 2013 (54) GOLF BALL COMPOSITION cover layer. The outer cover layer and/or one or more inter mediate layers includes a blend of a)2 to 60 wt % (based on (75) Inventors: Hyun J. Kim, Carlsbad, CA (US); Hong the total weight of the blend composition) of a cyclic olefin G. Jeon, Carlsbad, CA (US) polymer which includes a norbornene-based monomer hav (73) Assignee: Taylor Made Golf Company, Inc. ing the general formula: (21) Appl. No.: 13/330,453 (22) Filed: Dec. 19, 2011 Publication Classification (51) Int. Cl. A63B 37/00 (2006.01) A63B 37/2 (2006.01) R18 R19, R2 A63B 37/08 (2006.01) R20 A63B 37/02 (2006.01) A63B 37/06 (2006.01) (52) U.S. Cl. where R' to R' independently representahydrogenatom, a USPC ........... 473/373; 473/378; 473/385; 473/372; halogenatom or a hydrocarbon group and mis from 0 to about 473/376; 473/377 3; and b) about 40 to about 98 wt % (based on the total weight of the blend composition) of one or more additional polymer (57) ABSTRACT components. The blend composition has a melt flow index This invention pertains to a golf ball which includes a core, (MFI) from 1 to 80 g/10 min., a material hardness of 30 to 90 optionally one or more intermediate layers; and an outer Shore D, and a flex modulus of 10 to 120 kpsi. Patent Application Publication Jun. 20, 2013 Sheet 1 of 2 US 2013/O157779 A1 F.G. 1 Patent Application Publication Jun. 20, 2013 Sheet 2 of 2 US 2013/O157779 A1 FIG 2 US 2013/0157779 A1 Jun. 20, 2013 GOLF BALL COMPOSITION limitations on the coefficient of restitution values of a golf ball, the USGA requires that the golf ball cannot exceed an BACKGROUND OF THE INVENTION initial velocity of 255 feet/second. As a result, golfball manu facturers generally seek to maximize the coefficient of resti 0001. The present invention relates to sports equipment in tution of a ball without violating the velocity limitation. general and more particularly to golfballs comprising a par 0006. Accordingly, a variety of golf ball constructions ticular composition Suitable for use in golfball manufacture. have been developed in an attempt to provide spin rates and a In one embodiment, the present invention is used in the manu feel approaching those of balata covered balls, while also facture of a golf ball comprising a core, a cover layer and, providing a golf ball with a higher durability and overall optionally, one or more inner cover layers. In one preferred distance. This has resulted in the emergence of balls, which embodiment, a golf ball is disclosed in which at least one have a solid rubber core, a cover, and one or more so called intermediate layer comprises the novel composition of the intermediate layers, as well as the application of new mate present invention. In another preferred embodiment, a golf rials to each of these components. ball is disclosed in which the outer cover layer comprises the 0007. A material which has been often utilized in more novel composition of the present invention. modern golf balls includes the various ionomer resins devel oped in the mid-1960s, by E.I. DuPont de Nemours and Co., DESCRIPTION OF RELATED ART and sold under the trademark SURLYNR). These ionomer 0002 The application of synthetic polymer chemistry to resins have, to a large extent, replaced balata as a golf ball the field of sports equipment has revolutionized the perfor cover stock material. Preparation of such ionomers is well mance of athletes in many sports. One sport in which this is known, for example see U.S. Pat. No. 3.264,272. Generally particularly true is golf, especially as relates to advances in speaking, commercial ionomers consist of a polymer of a golfball performance and ease of manufacture. For instance, mono-olefin, e.g., an alkene, with an unsaturated mono- or the earliest golf balls consisted of a leather cover filled with dicarboxylic acid having 3 to 12 carbon atoms. An additional wet feathers. These “feathery' golf balls were subsequently monomer in the form of a mono- or dicarboxylic acid ester replaced with a single piece golfball made from “gutta per may also be incorporated in the formulation as a so-called cha, a naturally occurring rubber-like material. In the early "softening comonomer. The acid groups in the polymer are 1900s, the wound rubberball was introduced, consisting of a then neutralized to varying degrees by addition of a neutral solid rubber core around which rubber thread was tightly izing agent in the form of a basic metal salt. wound with a gutta percha cover. 0008 More recent developments in the field have 0003 More modern golf balls can be classified as one attempted to utilize the various types of ionomers, both singly piece, two-piece, three-piece or multi-layeredgolfballs. One and in blend compositions to optimize the often conflicting piece balls are molded from a homogeneous mass of material golf ball performance requirements of high C.O.R. and ball with a dimple pattern molded thereon. One-piece balls are velocity, and cover durability, with the need for a ball to spin inexpensive and very durable, but typically do not provide and have a so-called soft feel on shorter iron shots. However, great distance because of relatively high spin and low veloc the incorporation of more acid in the ionomer and/or increas ity. Two-piece balls are made by molding a cover around a ing its degree of neutralization results in a material with solid rubber core. These are the most popular types of balls in increased polarity, and hence one which is often less compat use today. In attempts to further modify the ball performance, ible with other potential blend materials. Also increasing the especially in terms of the distance such balls travel, and the acid content of the ionomer while increasing C.O.R. may spin and the feel transmitted to the golfer through the club on render the ball too hard and brittle causing a loss of shot feel, striking the ball, the basic two piece ball construction has control (i.e., the ability to spin the ball) and may render the been further modified by the introduction of additional layers cover too brittle and prone to premature failure. Finally, the between the core and outer cover layer. If one additional layer incorporation of more acid in the ionomer and/or increasing is introduced between the core and outer cover layer a so its degree of neutralization typically results in an increase in called “three-piece ball results, if two additional layers are melt viscosity which in turn greatly decreases the process introduced between the core and outer cover layer, a so called ability of these resins. Attempts to mediate these effects by “four-piece ball results, and so on. adding softer terpolymeric ionomers to high acid ionomer 0004 Golf ball covers were previously made from balata compositions to adjust the hardness and improve the shot rubber which was favored by some players because the soft “feel often result in concomitant loss of C.O.R. and hence ness of the cover allowed them to achieve spin rates sufficient distance. to allow more precise control of ball direction and distance, 0009. In view of the above, it is apparent that new materi particularly on shorter approach shots. However balata-cov als for golfball.cover and intermediate layers are needed that ered balls, although exhibiting high spin and soft feel, were allow the optimization of golf ball performance properties often deficient in terms of the durability of the cover which while maintaining processability. We have now Surprisingly found that cyclic olefin polymers and their blends, when had a propensity to shear and also the velocity of the ball when incorporated into golf ball compositions used to make both it leaves the club face (which in turn affects the distance the golf ball cover and/or intermediate layers can deliver ball travels). improvements in both golfball performance and processabil 0005. The distance a golf ball travels is directly related to 1ty. the coefficient of restitution (“C.O.R.) of the ball. The coef ficient of restitution of a one-piece golf ball is in part a function of the ball's composition. In a two-piece or a multi SUMMARY layered golf ball, the coefficient of restitution is a function of 0010. This invention pertains to a golfball which includes the properties of the core, the cover and any additional layer. a core, optionally one or more intermediate layers; and an While there are no United States Golf Association (“USGA') outer cover layer. The outer cover layer includes a blend ofa) US 2013/0157779 A1 Jun. 20, 2013 about 2 to about 60 wt (based on the total weight of the blend where R' to R' independently representahydrogenatom, a composition) of a cyclic olefin polymer which includes a halogenatom or a hydrocarbon group and mis from 0 to about norbornene-based monomer having the general formula: 3; and b) about 40 to about 98 wt % (based on the total weight of the blend composition) of one or more additional polymer components. The blend composition has a melt flow index (MFI) from about 1 to about 80 g/10 min., a material hardness of about 30 to about 90 Shore D, and a flex modulus of about 10 to about 120 kpsi.
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