US 2022/0152459 A1Published application

Golf ball

AssigneeBridgestone Sports Co., Ltd.

InventorMasahiro YAMABE

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Abstract

In a golf ball having a core and a cover of one or more layer, at least one layer of the cover is formed of a resin composition which includes in a specific weight ratio: (I) a thermoplastic polyurethane resin that uses polytetramethylene glycol having a number-average molecular weight of from 1,900 to 2,100 as the polyol component, (II) a thermoplastic polyurethane resin that uses polytetramethylene glycol having a number-average molecular weight of from 900 to 1,100 as the polyol component, and (III) an aromatic vinyl elastomer. The cover layer formed of this resin composition has a Martens hardness and an elastic work recovery which together satisfy a specific formula. The golf ball has an excellent controllability on approach shots without losing distance on driver shots. In addition, the scuff resistance and moldability are good.

Claims9

Dependent claims

A golf ball comprising a core of at least one layer and a cover of one or more layer encasing the core, wherein at least one layer of the cover is formed of a resin composition which comprises:

(I) a thermoplastic polyurethane resin that uses, as a polyol component, polytetramethylene glycol having a number-average molecular weight of from 1,900 to 2,100,
(II) a thermoplastic polyurethane resin that uses, as a polyol component, polytetramethylene glycol having a number-average molecular weight of from 900 to 1,100, and
(III) an aromatic vinyl elastomer,
and in which components (I) and (II) are compounded in a weight ratio (II)/(I) of from 0.01 to 1.10;
and, letting HMb (N/mm2) be the Martens hardness of the cover layer formed of the resin composition containing components (I) to (III) and ηItb (%) be the elastic work recovery of the cover layer, HMb and ηItb satisfy formula (1) below
2.00≤ηItb/HMb≤7.50 (1).

3 more elements

Dependencies are inferred from the claim text.