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US 2004/0106469 A1Published application
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
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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 comprising a resilient polymer comprising:
- a rubber material having a molecular weight of greater than about 200,000, wherein the rubber material has a resilience index of at least about 40, and wherein the resilience index of the rubber material is calculated using the formula:
- Resilience Index=100,000*[(Tan δ at 10 cpm)−(Tan δ at 1000 cpm)]/990;
- a crosslinking material present in an amount of about 10 to about 40 parts per hundred of the resilient polymer;
- a free radical source present in an amount of about 0.1 to about 15 parts per hundred of the resilient polymer;
- a cis-to-trans catalyst present in an amount of about 0.1 to about 10 parts per hundred of the resilient polymer;
- and
- a cover comprising a thermoplastic or thermoset polyurethane.
5 more elements
A golf ball comprising:
- a center comprising a resilient polymer, wherein the resilient polymer comprises:
- polybutadiene having a molecular weight of about 300,000 to about 500,000 and a resilience index of about 40, wherein the resilience index is calculated using the formula:
- Resilience Index=100,000*[(Tan δ at 10 cpm)−(Tan δ at 1000 cpm)]/990;
- a crosslinking material present in an amount of about 10 to about 40 parts per hundred of the resilient polymer;
- a free radical source present in an amount of about 0.1 to about 15 parts per hundred of the resilient polymer;
- a cis-to-trans catalyst present in an amount of about 0.1 to about 10 parts per hundred of the resilient polymer;
- and
- a cover formed of a castable reactive liquid material.
5 more elements
A golf ball comprising:
- a center comprising a resilient polymer, wherein the resilient polymer comprises:
- a rubber material having a molecular weight of greater than about 200,000 and a resilience index of about 50, wherein the resilience index is calculated using the equation:
- Resilience Index=100,000*[(Tan δ at 10 cpm)−(Tan δ at 1000 cpm)]/990;
- a crosslinking material present in an amount of about 10 to about 40 parts per hundred of the resilient polymer;
- a free radical source present in an amount of about 0.1 to about 15 parts per hundred of the resilient polymer;
- a cis-to-trans catalyst present in an amount sufficient to produce a resilient polymer comprising about 12 percent or greater trans-isomer;
- and
- a cover formed of a thermoset or thermoplastic polyurethane, wherein the cover has a hardness of about 30 Shore D to about 60 Shore D.
5 more elements
Dependencies are inferred from the claim text.