Claims
- 1. A golf ball having a core covered with a cover, wherein a ratio of a flexural rigidity value of said golf ball to a flexural rigidity value of said core is 1.8 or more and less than 3.0, and a thickness of said cover is 1.7 to 2.6 mm.
- 2. The golf ball according to claim 1, wherein Young's modulus of elasticity of said cover is 100 to 200 MPa.
- 3. The golf ball according to claim 1, wherein said cover is composed of a composition, containing ionomer resin and diene rubber, in which the diene rubber is dispersed in the ionomer resin in such a manner that it has a particle diameter of 5 μm or less.
- 4. A golf ball having a core covered with a cover, wherein a ratio of a compression value of said golf ball to a compression value of said core is 1.2 or more and less than 1.5, and said cover has a Shore D hardness of 62 or less.
- 5. The golf ball according to claim 4, wherein said cover is composed of a composition, containing (i) 50 to 90 parts by weight of ionomer resin of Shore D hardness of 55 or more and less than 80 and (ii) 10 to 50 parts by weight of diene rubber, in which the diene rubber is dispersed in the ionomer resin in such a manner that it has a particle diameter of 5 μm or less.
- 6. The golf ball according to claim 5, wherein said diene rubber is thermally crosslinked without the use of crosslinking agent.
- 7. A golf ball having a core and a cover covering said core, wherein said core is constituted of a rubber composition which is compounded of 100 parts by weight of matrix rubber containing polybutadiene rubber having 40% or more of cis-1,4-structure and 20 to 40 parts by weight of unsaturated carboxylic acid metal salt having an average particle size of 5.0 pm or less, and said cover is constituted of a resin composition which is composed of ionomer resin and diene rubber dispersed in the ionomer resin and which has Shore D hardness of 65 or less.
- 8. The golf ball according to claim 7, wherein the average particle size of said unsaturated carboxylic acid metal salt is 2.0 to 3.5 μm.
- 9. The golf ball according to claim 7, wherein said unsaturated carboxylic acid metal salt is zinc diacrylate and/or zinc dimethacrylate.
- 10. The golf ball according to claim 7, wherein 10 to 30 parts by weight of barium sulfate are further blended with said rubber composition.
- 11. The golf ball according to claim 7, wherein said diene rubber is thermally crosslinked without the use of crosslinking agent.
- 12. The golf ball according to claim 7, wherein Shore D hardness of said cover is 45 to 62.
- 13. A golf ball having a core applied with a cover, wherein the cover has a Shore D hardness (A) of 63 or below and the golf ball has a compression value (B), the Shore D hardness (A) of the cover having a ratio to the compression value (B) of the golf ball, (A)/(B), within a range of 0.49 to 0.6.
- 14. A golf ball as claimed in claim 13, wherein said cover has a thickness within a range of 2.0 to 2.4 mm.
- 15. A golf ball as claimed in claim 13, wherein said cover comprises a thermoplastic elastomer composition containing an ionomer resin and a diene rubber.
- 16. A golf ball as claimed in claim 13, wherein said cover comprises a diene rubber dispersed in a continuous phase comprising an ionomer resin, the diene rubber being thermally crosslinked without the use of a crosslinking agent.
Priority Claims (7)
Number |
Date |
Country |
Kind |
9-223321 |
Aug 1997 |
JP |
|
9-239591 |
Sep 1997 |
JP |
|
9-270955 |
Oct 1997 |
JP |
|
9-291091 |
Oct 1997 |
JP |
|
9-303979 |
Nov 1997 |
JP |
|
10-169705 |
Jun 1998 |
JP |
|
10-196998 |
Jul 1998 |
JP |
|
RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 09/135,595 filed Aug. 18, 1998.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
5833553 |
Sullivan et al. |
Nov 1998 |
|
5971870 |
Sullivan et al. |
Oct 1999 |
|
5993332 |
Yamagishi et al. |
Nov 1999 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09/135595 |
Aug 1998 |
US |
Child |
09/352347 |
|
US |