# US 11,110,322 B2 · Golf ball

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- Number: US 11,110,322 B2
- Document ID: US11110322B2
- Status: Granted
- Kind: B2
- Application number: 16/671,356
- Filed: 2019-11-01
- Published: 2020-05-07
- Granted: 2021-09-07
- Earliest claimed: 2018-11-02
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Sumitomo Rubber Industries, Ltd.
- Inventors: Kuniyasu Horiuchi; Toshiyuki Tarao; Hidetaka Inoue
- Web page: https://patentgrep.com/patent/US11110322B2

## CPC

- A63B 37/0003: {Golf balls}
- A63B 37/00221: {characterised by the material}
- A63B 37/0018: {Specified number of dimples}
- A63B 37/00222: {Physical properties, e.g. hardness}
- A63B 37/0031: {Hardness}
- A63B 37/0033: {Thickness}
- A63B 37/0064: {Diameter}
- A63B 37/0073: {Solid, i.e. formed of a single piece}
- A63B 37/0074: {Two piece balls, i.e. cover and core}
- A63B 37/0075: {Three piece balls, i.e. cover, intermediate layer and core}
- A63B 37/0076: {Multi-piece balls, i.e. having two or more intermediate layers}
- A63B 37/008: {Diameter}
- A63B 37/0087: {Deflection or compression}
- A63B 45/00: Apparatus or methods for manufacturing balls (working of plastics or substances in a plastic state B29)
- C08G 18/092: {oligomerisation to isocyanurate groups}
- C08G 18/10: Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G 18/3206: {aliphatic}
- C08G 18/4825: {Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence)}
- C08G 18/4854: {Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group}
- C08G 18/6677: {having at least three hydroxy groups}
- C08G 18/69: Polymers of conjugated dienes {(hydrogenated polymers of conjugated dienes C08G18/6208)}
- C08G 18/725: {Combination of polyisocyanates of C08G18/78 with other polyisocyanates}
- C08G 18/73: acyclic
- C08G 18/755: {and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate}
- C08G 18/7831: {containing biuret groups}
- C08G 18/792: {formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates}
- C09D 175/08: from polyethers
- A63B 37/0096: {Spin rate}
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

An object of the present invention is to provide a golf ball having excellent approach spin performance under a dry condition and excellent approach spin performance under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein the paint film is composed of at least one layer, and an outermost paint film layer located at the outermost layer of the golf ball contains, as a base resin, a polyurethane obtained by a reaction between (A) a polyisocyanate composition and (B) a polyol composition, (B) the polyol composition contains a urethane polyol as a polyol component, and the outermost paint film layer has a dynamic friction coefficient of from 0.65 to 1.2 measured with a dynamic friction tester under specific conditions.

## Claims

### Claim 1

A golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein
the paint film is composed of at least one layer, and an outermost paint film layer located at the outermost layer of the golf ball contains, as a base resin, a polyurethane obtained by a reaction between (A) a polyisocyanate composition and (B) a polyol composition,
(A) the polyisocyanate composition contains an adduct-modified product of hexamethylene diisocyanate as a polyisocyanate component and the polyisocyanate component contains the adduct-modified product of hexamethylene diisocyanate in an amount of from 30 mass % to 100 mass %,
the adduct-modified product of hexamethylene diisocyanate is a product obtained by a reaction between hexamethylene diisocyanate and a polyhydric alcohol,
(B) the polyol composition contains a urethane polyol as a polyol component, and
the outermost paint film layer has a dynamic friction coefficient of from 0.83 to 1.2 measured with a dynamic friction tester under following conditions:
<measurement conditions>
moving speed: 2 mm/s
load: 1.96 N
measuring item: dynamic friction average value in a moving distance of from 2 mm to 10 mm.

### Claim 2 (depends on 1)

The golf ball according to claim 1, wherein the dynamic friction coefficient of the outermost paint film layer ranges from 0.83 to 1.1.

### Claim 3 (depends on 1)

The golf ball according to claim 1, wherein the urethane polyol has a weight average molecular weight in a range of from 5,000 to 20,000.

### Claim 4 (depends on 1)

The golf ball according to claim 1, wherein the urethane polyol includes a polyether diol as a constituent component.

### Claim 5 (depends on 4)

The golf ball according to claim 4, wherein the polyether diol has a number average molecular weight in a range of from 400 to 3,000.

### Claim 6 (depends on 1)

The golf ball according to claim 1, wherein the outermost paint film layer has a storage modulus (E′) in a range of from 10 MPa to 100 MPa at the temperature of 24° C.

### Claim 7 (depends on 1)

The golf ball according to claim 1, wherein the outermost paint film layer has a loss modulus (E″) in a range of from 0.1 MPa to 80 MPa at the temperature of 24° C.

### Claim 8 (depends on 1)

The golf ball according to claim 1, wherein the outermost paint film layer has a 10% elastic modulus in a range of from 1 kgf/cm2 to 50 kgf/cm2.

### Claim 9 (depends on 1)

The golf ball according to claim 1, wherein a loss tangent (tan δ) of the outermost paint film layer measured with a dynamic viscoelasticity measuring apparatus under following conditions has a peak temperature in a range of from −40° C. to 40° C.:
<measurement conditions>
measuring mode: tensile mode
measuring temperature: −100° C. to 150° C.
temperature increase rate: 4° C. /min
oscillation frequency: 10 Hz
measuring strain: 0.1%.

### Claim 10 (depends on 1)

The golf ball according to claim 1, wherein the adduct-modified product of hexamethylene diisocyanate is combined with an isocyanurate-modified product, and a mass ratio (adduct-modified product of hexamethylene diisocyanate/isocyanurate-modified product) of the adduct-modified product of hexamethylene diisocyanate to the isocyanurate-modified product is 0.43 or more.

### Claim 11 (depends on 10)

The golf ball according to claim 10, wherein the adduct-modified product of the diisocyanate is an adduct-modified product of hexamethylene diisocyanate, the isocyanurate-modified product of the diisocyanate is an isocyanurate-modified product of hexamethylene diisocyanate, and the polyisocyanate component contains the adduct-modified product of hexamethylene diisocyanate and the isocyanurate-modified product of hexamethylene diisocyanate in a total amount of from 70 mass % to 100 mass %.

### Claim 12 (depends on 1)

The golf ball according to claim 1, wherein the paint film has a single layered structure.

### Claim 13 (depends on 1)

The golf ball according to claim 1, wherein the adduct-modified product of hexamethylene diisocyanate is a triisocyanate of formula (1) or formula (2) below:

### Claim 14 (depends on 10)

The golf ball according to claim 10, wherein the adduct-modified product of hexamethylene diisocyanate is a product obtained by a reaction between hexamethylene diisocyanate and a polyhydric alcohol.

### Claim 15 (depends on 10)

The golf ball according to claim 10, wherein the adduct-modified product of hexamethylene diisocyanate is a triisocyanate of formula (1) or formula (2) below:

### Claim 16 (depends on 10)

The golf ball according to claim 10, wherein the isocyanurate-modified product is a compound of formula (3)

### Claim 17 (depends on 15)

The golf ball according to claim 15, wherein the isocyanurate-modified product is a compound of formula (3)