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US 7,009,005 B2Granted
Thin-layer-covered golf ball with improved velocity
AssigneeAcushnet Company
InventorsShenshen Wu, Edmund A. Hebert, Laurent Bissonnette, David A. Bulpett, Murali Rajagopalan, Peter Voorheis, Mark N. Wrigley
Life of this patent
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Abstract
A golf ball comprising a center comprising a polybutadiene having a molecular weight of greater than 200,000 and a resilience index of at least about 40; and a cover layer comprising a polyurethane composition formed from a prepolymer having no greater than 7.5 percent by weight unreacted isocyanate groups.
Claims21
A golf ball comprising:
- a center formed of a reaction product having a dynamic stiffness of less than about 50,000 N/m at −50°C. comprising:
- polybutadiene having a molecular weight of greater than about 200,000;
- a crosslinking material present in an amount of about 10 to about 40 parts per hundred of the reaction product;
- a free radical source present in an amount of about 0.1 to about 15 parts per hundred of the reaction product;
- a cis-to-trans catalyst present in an amount of about 0.1 to about 10 parts per hundred of the reaction product, wherein the cis-to-trans catalyst comprises a metal organosulfur compound;
- and
- a cover comprising a thermoplastic or thermoset polyurethane.
4 more elements
A golf ball comprising:
- a center formed of a reaction product comprising:
- polybutadiene having a molecular weight of greater than about 200,000;
- a crosslinking material present in an amount of about 10 to about 40 parts per hundred of the reaction product;
- a free radical source present in an amount of about 0.1 to about 15 parts per hundred of the reaction product;
- a cis-to-trans catalyst present in an amount of about 0.1 to about 10 parts per hundred of the reaction product, wherein the reaction product has a percent change in dynamic stiffness from 0° C. to −50° C. of less than 20 percent, wherein the cis-to-trans catalyst comprises a metal organosulfur compound;
- and
- a cover comprising a thermoplastic or thermoset polyurethane.
4 more elements
A golf ball comprising:
- a center formed of a reaction product having a dynamic stiffness of less than about 50,000 N/m at −50° C. and a percent change in dynamic stiffness from 0°C. to −50° C. of less than 20 percent, wherein the reaction product comprises:
- polybutadiene having a molecular weight of greater than about 200,000;
- a crosslinking material present in an amount of about 10 to about 40 parts per hundred of the reaction product;
- a free radical source present in an amount of about 0.1 to about 15 parts per hundred of the reaction product;
- a cis-to-trans catalyst present in an amount sufficient to produce a reaction product having at least 32 percent trans-isomer;
- and
- a cover comprising a castable reactive liquid material.
4 more elements
Dependencies are inferred from the claim text.