# US 2021/0275875 A1 · Golf ball

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- Number: US 2021/0275875 A1
- Document ID: US20210275875A1
- Status: Published application
- Kind: A1
- Application number: 17/191,257
- Filed: 2021-03-03
- Published: 2021-09-09
- Earliest claimed: 2020-03-04
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Sumitomo Rubber Industries, Ltd.
- Inventors: Yasuo NAITO; Yuko OKA; Toshiyuki TARAO; Kazuyoshi SHIGA; Hidetaka INOUE; Kazuya KAMINO
- Web page: https://patentgrep.com/patent/US20210275875A1

## CPC

- A63B 37/00221: {characterised by the material}
- C08G 18/4277: {Caprolactone and/or substituted caprolactone}
- A63B 37/00222: {Physical properties, e.g. hardness}
- C08G 18/246: {containing also tin-carbon bonds}
- C08G 18/3206: {aliphatic}
- C08G 18/3218: {containing cyclic groups having at least one oxygen atom in the ring}
- C08G 18/4854: {Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group}
- C08G 18/6484: {Polysaccharides and derivatives thereof}
- C08G 18/6677: {having at least three hydroxy groups}
- C08G 18/6715: {Unsaturated monofunctional alcohols or amines}
- 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 175/04: Polyurethanes
- C08K 3/36: Silica
- C08K 2201/005: Additives being defined by their particle size in general
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

An object of the present invention is to provide a golf ball having excellent spin performance on approach shots from the rough (under a condition that there is grass between the golf ball and the club face) and excellent stain resistance. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein at least one layer of the paint film includes, as a base resin, a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the polyol composition contains, as a polyol component, a polyrotaxane having at least two hydroxyl groups and a urethane polyol.

## Claims

### Claim 1

A golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein at least one layer of the paint film includes, as a base resin, a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the polyol composition contains, as a polyol component, a polyrotaxane having at least two hydroxyl groups and a urethane polyol.

### Claim 2 (depends on 1)

The golf ball according to claim 1, wherein an amount of the polyrotaxane having at least two hydroxyl groups in the polyol component is more than 0 mass % and less than 10 mass %.

### Claim 3 (depends on 1)

The golf ball according to claim 1, wherein a polyol component constituting the urethane polyol includes at least one member selected from the group consisting of a polyether diol, a polyester diol, a polycaprolactone diol, and a polycarbonate diol.

### Claim 4 (depends on 1)

The golf ball according to claim 1, wherein a polyol component constituting the urethane polyol includes at least one member selected from the group consisting of a polyoxyethylene glycol, a polyoxypropylene glycol, and a polyoxytetramethylene glycol.

### Claim 5 (depends on 1)

The golf ball according to claim 1, wherein a polyol component constituting the urethane polyol includes a polyoxytetramethylene glycol having a number average molecular weight from 500 to 3000.

### Claim 6 (depends on 1)

The golf ball according to claim 1, wherein a polyisocyanate component constituting the urethane polyol includes an alicyclic diisocyanate.

### Claim 7 (depends on 1)

The golf ball according to claim 1, wherein the polyrotaxane having at least two hydroxyl groups has a cyclodextrin, a linear molecule piercing through the cyclic structure of the cyclodextrin, and blocking groups located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin, wherein at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via a —O—C3H6—O— group.

### Claim 8 (depends on 1)

The golf ball according to claim 1, wherein the polyisocyanate composition contains, as a polyisocyanate component, at least one member selected from the group consisting of an isocyanurate-modified product of hexamethylene diisocyanate, an adduct-modified product of hexamethylene diisocyanate, a biuret-modified product of hexamethylene diisocyanate, and an isocyanurate-modified product of isophorone diisocyanate.

### Claim 9 (depends on 1)

The golf ball according to claim 1, wherein the at least one layer of the paint film further includes a porous filler.

### Claim 10 (depends on 9)

The golf ball according to claim 9, wherein an amount of the porous filler is 0.5 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the base resin.

### Claim 11 (depends on 9)

The golf ball according to claim 9, wherein the porous filler contains 50 mass % or more of SiO2 as a constituent component.

### Claim 12 (depends on 9)

The golf ball according to claim 9, wherein the porous filler includes at least one member selected from the group consisting of zeolite, pearlite, and diatomaceous earth.

### Claim 13 (depends on 1)

The golf ball according to claim 1, wherein an outermost layer of the paint film located at the outermost layer of the golf ball includes the polyurethane as the base resin.

### Claim 14 (depends on 9)

The golf ball according to claim 9, wherein an outermost layer of the paint film located at the outermost layer of the golf ball includes the base resin and the porous filler.

### Claim 15 (depends on 1)

The golf ball according to claim 1, wherein the polyol composition further contains a polycaprolactone polyol and/or a hydroxy group modified vinyl chloride-vinyl acetate copolymer as the polyol component.

### Claim 16 (depends on 1)

The golf ball according to claim 1, wherein an amount of the urethane polyol in the polyol component is more than 80 mass % and less than 100 mass %.

### Claim 17 (depends on 15)

The golf ball according to claim 15, wherein an amount of the polycaprolactone polyol in the polyol component is 0 mass % or more and 5 mass % or less, and an amount of the hydroxy group modified vinyl chloride-vinyl acetate copolymer in the polyol component is 0 mass % or more and 5 mass % or less.

### Claim 18 (depends on 9)

The golf ball according to claim 9, wherein a ratio (d/T) of a volume average particle size (d) of the porous filler to a thickness (T) of the at least one layer of the paint film is 0.01 or more and 2.0 or less.