Multi-piece solid golf ball

Details Multi-piece solid golf ball Multi-piece solid golf ball

1998-08-10

2001-01-16

Graham, Mark S. (Department: 3711)

Games using tangible projectile

Golf

Ball

Reexamination Certificate

active

06174247

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a multi-piece solid golf ball comprising a solid core enclosed with a cover of two inner and outer layers.
2. Prior Art
Golf balls of various structures have recently been proposed. In particular, many proposals were made on solid golf balls, inter alia, multi-piece solid golf balls comprising a solid core enclosed with a cover of plural layers from the standpoints of flight distance, control (or spin rate), and feeling (see JP-A 244174/1992, 142228/1994, 24084/1995, 24085/1995, and 10358/1997).
Nevertheless, there is a desire to have a multi-piece solid golf ball having further improved flight performance, superior spin property, and good feeling upon wood, iron and putter shots as well as good scraping resistance and durability.
SUMMARY OF THE INVENTION
Making extensive investigations to meet the above desire, the inventors have found that it is effective for a multi-piece solid golf ball comprising a solid core and a cover of two inner and outer layers surrounding the core that the solid core is formed relatively soft, the inner cover layer is formed mainly of an ionomer resin, the outer cover layer is formed mainly of a thermoplastic polyester elastomer, the inner cover layer has a Shore D hardness of 28 to 58, and the outer cover layer has a Shore D hardness of 28 to 55.
Specifically, the present invention provides:
(1) A multi-piece solid golf ball comprising a solid core and a cover of two inner and outer layers surrounding the core, characterized in that said solid core has a distortion of at least 2.4 mm under an applied load of 100 kg, said inner cover layer is formed mainly of an ionomer resin to a Shore D hardness of 28 to 58, and said outer cover layer is formed mainly of a thermoplastic polyester elastomer to a Shore D hardness of 28 to 55.
(2) The golf ball of (1) wherein the resin of said inner cover layer is a mixture of an ionomer resin and an olefinic elastomer in a weight ratio between 40:60 and 95:5.
(3) The golf ball of (1) or (2) wherein in said outer cover layer, an ionomer resin having a Shore D hardness of at least 55 is mixed in a proportion of less than 70 parts by weight per 100 parts by weight of the thermoplastic polyester elastomer.
(4) The golf ball of any one of (1) to (3) wherein the ball as a whole has an inertia moment of at least 82.5 g-cm
2
.
(5) The golf ball of any one of (1) to (4) wherein 1 to 30% by weight of an inorganic filler is added to said outer cover layer.
(6) The golf ball of any one of (1) to (5) wherein 1 to 30% by weight of an inorganic filler is added to said inner cover layer.
(7) The golf ball of any one of (1) to (6) wherein said outer cover layer has a specific gravity of 1.05 to 1.4.
(8) The golf ball of any one of (1) to (7) wherein said inner cover layer has a specific gravity of 0.8 to 1.2.
(9) The golf ball of any one of (1) to (8) wherein said core has a specific gravity of 0.9 to 1.3.
(10) The golf ball of any one of (1) to (9) wherein said outer cover layer has a gage of 0.5 to 2.5 mm, said inner cover layer has a gage of 0.5 to 3.0 mm, and said cover has a total gage of 1.0 to 5.5 mm.
The golf ball of the invention features an increased flight distance, superior control upon iron shots, good feeling upon shots with any club of wood, iron and putter, high resistance to scraping upon control shots with an iron, and good durability.


REFERENCES:
patent: 4919434 (1990-04-01), Saito
patent: 5025067 (1991-06-01), Gentiluomo
patent: 5439227 (1995-08-01), Egashira et al.
patent: 5553852 (1996-09-01), Higuchi et al.
patent: 5730664 (1998-03-01), Asakura et al.
patent: 5813923 (1998-09-01), Cavallaro et al.
patent: 5929189 (1999-07-01), Ichikawa et al.
patent: 0 633 043 A1 (1995-01-01), None
patent: 2 278 609 (1994-12-01), None

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