Golf ball

A one-piece golf ball comprising a golf ball body, wherein the golf ball body is formed of a cured product of a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent and (c) a crosslinking initiator, wherein

• (a) the base rubber contains (a1) a natural rubber,
• an amount of a graft polymer of (b) the co-crosslinking agent in the cured product of the rubber composition ranges from 10.0 parts by mass to 18.0 parts by mass,
• an amount of a non-graft polymer of (b) the co-crosslinking agent in the cured product of the rubber composition ranges from 3.0 parts by mass to 15.0 parts by mass with respect to 100 parts by mass of the (a) base rubber, and
• the one-piece golf ball has
• a diameter ranging from 40 mm to 45 mm, a compression deformation amount (shrinking amount along the compression direction) ranging from 2.0 mm to 6.0 mm when applying a load from an initial load of 98 N to a final load of 1275 N to the one-piece golf ball, and
• a coefficient of restitution (e40) ranging from 0.500 to 0.700.

A golf ball comprising a constituent member, wherein

• at least a part of the constituent member is formed of a cured product of a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent and (c) a crosslinking initiator,
• (a) the base rubber contains (a1) a natural rubber and (a2) a synthetic rubber, and
• the cured product of the rubber composition satisfies the following formulae (3) and (4)
• 3.5
• ≤
• (
• 100
• -
• A
• )
• /
• Y
• ≤
• 5
• .
• 0
• (
• 3
• )
• 3.
• ≤
• A
• /
• Z
• ≤
• 7
• .
• 0
• (
• 4
• )
• wherein in the formulae (3) and (4),
• A represents the amount of (a1) the natural rubber in the base rubber component (mass %),
• Y represents an amount (parts by mass) of a graft polymer of (b) the co-crosslinking agent in the cured product of the rubber composition and
• Z represents an amount (parts by mass) of a non-graft polymer of (b) the co-crosslinking agent in the cured product of the rubber composition with respect to 100 parts by mass of the (a) base rubber.

A golf ball comprising a constituent member, wherein

• at least a part of the constituent member is formed of a cured product of a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent and (c) a crosslinking initiator,
• (a) the base rubber contains (a1) a natural rubber and (a2) a synthetic rubber,
• a grafting ratio of (b) the co-crosslinking agent in the cured product of the rubber composition ranges from 40 mass % to 80 mass %,
• the cured product of the rubber composition satisfies the following formula (1) when an amount of (a1) the natural rubber is 40 mass % or less in 100 mass % of (a) the base rubber, and the cured product of the rubber composition satisfies the following formula (2) when an amount of (a1) the natural rubber is more than 40 mass % in 100 mass % of (a) the base rubber:
• 0.7
• ≤
• (
• 100
• -
• A
• )
• /
• X
• ≤
• 1.25
• (
• 1
• )
• 0.7
• ≤
• A
• /
• (
• 100
• -
• X
• )
• ≤
• 1.25
• (
• 2
• )
• wherein in the formulae (1) and (2), A represents the amount of (a1) the natural rubber in the base rubber component (mass %), and X represents the grafting ratio of the co-crosslinking agent (mass %), and
• the golf ball has
• a diameter ranging from 40 mm to 45 mm,
• a compression deformation amount (shrinking amount along the compression direction) ranging from 2.5 mm to 6.0 mm when applying a load from an initial load of 98 N to a final load of 1275 N to the golf ball, and
• a coefficient of restitution (e40) ranging from 0.500 to 0.700.