Multi-layer golf ball having a cover layer with increased moisture resistance
a golf ball and multi-layer technology, applied in the field of golf balls, can solve the problems of low spin and feel properties, easy damage, and lack of durability of balata covers for the average golfer, and achieve the effect of low weight gain
Inactive Publication Date: 2007-03-15
ACUSHNET CO
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- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0010] The cover layer may be formed from a composition comprising a hydrogenated telechelic polyhydrocarbon polyahl having a Mn of 1,500 to 1 0,000, preferably 3,000 to 5,000, and a functionality of 1.8 to 2.0, preferably 1.9, a saturated polyisocyanate (e.g., bis(isocyanatocyclohexyl)-methane), and a saturated secondary polyamine (e.g., bis(sec-butylamino)-dicyclohexylmethane). Preferably, the telechelic polyahl forms soft segment in the resulting reaction product. The cover may be a thermoplastic or thermoset polyurethane or polyurea, preferably a cast thermoset. The cover may have a water vapor permeability of 0.1 g·mm / (m2·day·mm Hg) or less. The golf ball may display a low weight gain, when subjected to total water submersion at ambient temperature for 3 weeks, of 0.003 oz / wk or less.
Problems solved by technology
However, balata covers lack the durability required by the average golfer, and are easily damaged.
Ionomer covers may be virtually cut-proof, but in comparison to balata covers, they display inferior spin and feel properties.
However, conventional polyurethane covers do not match ionomer covers with respect to resilience or rebound.
Conventional polyurethane covers can be prone to absorption of moisture, which is another mechanism through which desirable physical properties in the cover may be compromised.
Moisture passed through the cover may further deteriorate physical and performance properties of the core.
Method used
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Embodiment Construction
[0011] Broadly, the present disclosure is directed to golf balls and compositions used to form such golf balls. The golf balls may have a compression of 110 or less, a deflection at 100 kg force of 1.0 mm or greater, a coefficient of restitution (“CoR”) of 0.79 or more, preferably 0.825 or less, a moment of inertia (“MOI”) of 87 or less, an overall diameter of 1.68 inches or greater, and / or a dimple pattern having 250 to 450 dimples. When subjected to a total submersion test in tap water at ambient temperature, the golf balls display a low weight gain, with a 3-week averaged weight gain of preferably 0.003 oz / wk or less, more preferably 0.002 oz / wk or less, most preferably 0.001 oz / wk or less. The MOI is typically measured on model number MOI-005-104 Moment of Inertia Instrument manufactured by Inertia Dynamics of Collinsville, Conn. The instrument is plugged into a COMM port of a PC and is driven by MOI Instrument Software version #1.2.
[0012] An embodiment of the golf ball may hav...
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A golf ball having a core, a harder non-ionomer inner layer, and a cover layer. The inner layer having a material hardness of 50 Shore D to 80 Shore D, a flexural modulus of 30 to 175 kpsi, and comprising a composition that comprises a polyester elastomer. The cover layer is formed from a composition having multiple reactive and / or non-reactive ingredients, and having a material hardness of 25 Shore D to 70 Shore D and a flexural modulus of 2,000 psi to 100,000 psi. The cast cover includes a composition that comprises a hydrogenated telechelic polyhydrocarbon polyahl having a number average molecular weight of 1,500 to 10,000. The cover is a cast urethane or urea material.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation-in-part of U.S. application Ser. No. 11 / 243,850, filed Oct. 5, 2005, which is a continuation-in-part of U.S. application Ser. No. 11 / 162,538, filed Sep. 14, 2005, which is a continuation-in-part of U.S. application Ser. No. 10 / 656,704, filed Sep. 5, 2003, now U.S. Pat. No. 6,989,422. These applications and patent are entirely incorporated herein by reference.FIELD OF THE INVENTION [0002] The present disclosure is directed to a golf ball that has a polyester elastomer intermediate layer covered by a cover layer having increased resistance to water and moisture vapor in comparison to conventional golf ball cover layers. BACKGROUND OF THE INVENTION [0003] One conventional material used to form golf ball covers is balata, a natural or synthetic trans-polyisoprene rubber. The softness of the balata cover allows the player to achieve spin rates sufficient to more precisely control ball direction and distance...
Claims
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IPC IPC(8): A63B37/04A63B37/06A63B37/14
CPCA63B37/0023A63B37/0031A63B37/0037A63B37/0065A63B37/0049A63B37/0061A63B37/0064A63B37/0043
InventorCAVALLARO, CHRISTOPHER
OwnerACUSHNET CO