Claims
- 1. A golf ball comprising; a core and a cover enclosing the core, said cover having at least one thin spherical layer with a uniform thickness of not more than 1.0 mm formed by injection molding a material satisfying formula (1):V≧(a/t2)−b (1) wherein V is an injection molding material fill speed in cubic centimeters per second, t is a thickness of said at least one spherical layer in millimeters, a=0.04M2−3.75M+137.5, and b=−1.49/M−0.57, and M is a melt flow rate in grams per 10 minutes at 190° C. of the injection molding material for said at least one thin spherical layer.
- 2. The golf ball of claim 1, wherein the melt flow rate of the injection molding material for said at least one thin spherical layer is from 0.5 to 50 g/10 min.
- 3. The golf ball of claim 1, wherein said at least one thin spherical layer has a thickness of at least 0.8 mm.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-338079 |
Nov 1997 |
JP |
|
Parent Case Info
This is a divisional of application Ser. No. 09/188,881 filed Nov. 10, 1998, now U.S. Pat. No. 6,190,597, issued Mar. 14, 2000 the disclosure of which is incorporated herein by reference.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
5578256 |
Austin |
Nov 1996 |
A |
5713802 |
Moriyama et al. |
Feb 1998 |
A |
5730663 |
Tanaka et al. |
Mar 1998 |
A |
5779562 |
Melvin et al. |
Jul 1998 |
A |