IP Library › Granted Patent US 9,925,417
Granted Patent B2
US 9,925,417 · App. 14/799,849 · Granted Mar 27, 2018

Golf ball comprising a very-low melt flow inner cover layer composition

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Quick Facts
Patent No.
US 9,925,417
App. No.
14/799,849
Filed
Jul 15, 2015
Granted
Mar 27, 2018
Kind
B2
Art Unit
3711
USPC
473/374
Abstract

A golf ball including a core; an inner cover layer formed from a thermoplastic composition and having a thickness of about 0.005 inches to 0.40 inches and a surface hardness of about 60 Shore D or greater; and an outer cover layer formed from a thermoset material and having a thickness of about 0.01 inches to 0.05 inches and a surface hardness of about 60 Shore D or less. The thermoplastic composition has a first melt flow index at 280° C. under a 10-kg load of less than about 35 g/10 min and a second melt flow index at 265° C. under a 5-kg load of less than about 10 g/10 min.

Claims (19)

1. A golf ball comprising:

a core;

an inner cover layer comprising a thermoplastic composition and having a thickness of about 0.005 inches to about 0.40 inches and a surface hardness of about 70 Shore D or less; and

an outer cover layer comprising a thermoset material and having a thickness of about 0.01 inches to about 0.075 inches and a surface hardness of about 20 Shore D to about 60 Shore D;

wherein the thermoplastic composition comprises a first melt flow index at 280° C. under a 10-kg load of less than about 35 g/10 min and a second melt flow index at 265° C. under a 5-kg load of less than about 10 g/10 min.

2. The golf ball of claim 1 , wherein the first melt flow index is about 20 g/10 min or less.

3. The golf ball of claim 2 , wherein the first melt flow index is about 10 g/10 min or less.

4. The golf ball of claim 3 , wherein the second melt flow index is about 5 g/10 min or less.

5. The golf ball of claim 1 , wherein the thermoplastic composition has a third melt flow index at 190° C. under a 2.16-kg load of less than about 2 g/10 min.

6. The golf ball of claim 5 , wherein the third melt flow index at is less than about 1 g/10 min.

7. The golf ball of claim 1 , wherein the thermoplastic composition comprises an ionomer.

8. The golf ball of claim 7 , wherein the ionomer is neutralized by a metal cation to 70 wt % or greater.

9. The golf ball of claim 8 , wherein the ionomer is neutralized by a metal cation to 80 wt % or greater.

10. The golf ball of claim 9 , wherein the ionomer is neutralized by a metal cation to 90 wt % or greater.

11. The golf ball of claim 1 , wherein the thermoplastic composition comprises an amine or a peroxide compound.

12. The golf ball of claim 1 , wherein the thermoplastic composition has been treated with radiation.

13. The golf ball of claim 1 , wherein the thermoplastic composition comprises an ionomer and a higher-melting-temperature thermoplastic resin.

14. The golf ball of claim 1 , wherein the thermoplastic composition comprises an ionomer and a reactive polymer.

15. The golf ball of claim 1 , wherein the core comprises an inner core and an outer core layer.