Appeal No. 2006-0480
Application No. 10/318,260
THE INVENTION
The appellants claim a golf ball having a cover made from a
blend that includes a silicone powder having an average particle
size of 0.7 to 700 μm. Claim 1 is illustrative:
1. A multi-piece golf ball comprising:
a core having a diameter of 30 to 40 mm, said core being made
from a rubber composition mainly containing polybutadiene;
at least one intermediate layer including the outermost layer
having a thickness of 0.5 to 2.0 mm, said outermost layer being
made from a resin material containing an ionomer resin in an amount
of 30% by weight or more; and
a cover having a thickness of 0.5 to 2.0 mm, said cover being
made from a material obtained by dispersedly blending at least one
kind of silicone powder selected from a silicone rubber powder, a
silicone resin powder, and a composite powder thereof, in a main
resin component containing an ionomer resin in an amount of 50% by
weight or more; wherein
the hardness of said outermost layer of said at least one
intermediate layer is harder than the hardness of a center portion
of said core, the hardness of said cover is harder than the
hardness of said outermost layer of said at least one intermediate
layer, and a difference in hardness between said cover and the
center portion of said core satisfies a relation of 10 ≤ Durometer
D hardness of cover - Durometer D hardness of center portion of
core) ≤ 40, and
an average particle size of said silicone powder is a range of
0.5 to 700 µm.
2
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