Appeal No. 2004-0919 Page 5
Application No. 09/842,607
and deforms 1.5 to 3.5 mm, preferably 1.8 to 3.2 mm under a constant load of 100 kg.
The solid core may be incorporated with other rubbers such as styrene-butadiene
rubber, natural rubber, isoprene rubber, etc. in addition to the polybutadiene rubber.
The amount of polybutadiene rubber in all the rubber components should be more than
50%, preferably more than 70% by weight. Saito teaches (column 4, lines 10-22) that:
It is necessary that the solid core deforms 1.5 to 3.5 mm, preferably 1.8 to
3.2 mm, under a constant load of 100 kg. This amount of deformation is
essential for the solid golf ball having the outstanding characteristics. If the
amount of deformation is less than 1.5 mm, the resulting ball is so hard that it
provides a poor shot feeling. Conversely, if it is greater than 3.5 mm, the ball is
poor in the coefficient of restitution and durability. It should be noted that the
solid core having the deformation of 1.5 to 3.5 mm is selected from ones
obtained from the above preparation procedure.
Saito then teaches (column 4, lines 23-57) that the solid core for the two-piece
ball is required to have a narrow hardness distribution. In other words, the difference
between the hardness at the center of the solid core and that at the outside should be
less than 10%, preferably less than 5%, when measured by using a JIS (Japanese
Industrial Standard) -A hardness tester. In the embodiment of Figure 2, the solid core
is made up of a central part (center core) and one or more peripheral parts (outer
cores) which differ from one another in hardness and/or density, although all of the
layers (or the central part and peripheral parts) should contain polybutadiene having
more than 40% of cis-1,4 bonds and an unsaturated carboxylic acid and/or a metal salt
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