Patent application EP20175615A (EP), filed 2020-05-20
Publication number: EP3744778A1
Title: GOLF BALL RUBBER COMPOSITION AND GOLF BALL USING THE SAME
Abstract: [0001]    An object of the present invention is to provide a cured product of a golf ball rubber composition imparting excellent durability. The present invention provides a cured product of a golf ball rubber composition cured from a golf ball rubber composition containing (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, and (c) a crosslinking initiator, wherein the cured product of the golf ball rubber composition satisfies the following mathematical formula (1):  Y < 0.1 × X − 1.30

<img class="EMIRef" id="683641182-ia01" />
in the formula (1), Y represents an effective crosslinking density of the cured product of the rubber composition (mmol/cc), and X represents an amount of the component (b) with respect to 100 parts by mass of (a) the base rubber (parts by mass).
IPC codes: A63B  37/    00            A I
C08L   9/    00            A I
Claims: number: 1
text: A golf ball comprising a cured product of a golf ball rubber composition as a constituent member, wherein the cured product is obtained by curing the golf ball rubber composition containing (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, and (c) a crosslinking initiator, and the cured product satisfies the following mathematical formula (1):  Y < 0.1 × X − 1.30
number: 2
text: The golf ball according to claim 1, wherein the cured product of the golf ball rubber composition satisfies the following mathematical formula (2):  Y < 0.1 × X − 1.50
number: 4
text: The golf ball according to claim 3, wherein the golf ball rubber composition contains (d) the radical scavenger in an amount ranging from 2 parts by mass to 15 parts by mass with respect to 100 parts by mass of (a) the base rubber.
number: 5
text: The golf ball according to claim 3 or 4, wherein (d) the radical scavenger includes a hindered phenol-based compound or a hindered amine-based compound.
number: 6
text: The golf ball according to any one of claims 1 to 5, wherein the golf ball rubber composition contains (e) a terpene-based resin.
number: 7
text: The golf ball according to claim 6, wherein the golf ball rubber composition contains (e) the terpene-based resin in an amount ranging from 2 parts by mass to 20 parts by mass with respect to 100 parts by mass of (a) the base rubber.
number: 8
text: The golf ball according to claim 6 or 7, wherein (e) the terpene-based resin is at least one member selected from the group consisting of a terpene polymer, a terpene-phenol copolymer, a terpene-styrene copolymer, a terpene-phenol-styrene copolymer, a hydrogenated terpene-phenol copolymer, a hydrogenated terpene-styrene copolymer, and a hydrogenated terpene-phenol-styrene copolymer.
number: 9
text: The golf ball according to any one of claims 6 to 8, wherein (e) the terpene-based resin is at least one member selected from the group consisting of compounds having a structure represented by the following chemical formulae (7) to (10):
number: 10
text: The golf ball according to any one of claims 6 to 9, wherein (e) the terpene-based resin has a softening point in a range of from 60 °C to 150 °C.
number: 11
text: The golf ball according to claim 1 or 2, wherein the golf ball rubber composition contains (c) the crosslinking initiator in an amount of 0.1 part by mass or less with respect to 100 parts by mass of (a) the base rubber.
Office action: search_report, dated 2020-12-02
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Final disposition: pending (2020-12-02)