# US 10,946,250 B2 · Golf ball > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,946,250 B2 - Document ID: US10946250B2 - Status: Granted - Kind: B2 - Application number: 16/434,934 - Filed: 2019-06-07 - Published: 2019-09-19 - Granted: 2021-03-16 - Earliest claimed: 2016-05-25 - Assignees: Sumitomo Rubber Industries, Ltd. - Applicants: Sumitomo Rubber Industries, Ltd. - Inventors: Hidetaka Inoue; Toshiyuki Tarao; Kuniyasu Horiuchi - Web page: https://patentgrep.com/patent/US10946250B2 ## CPC - A63B 37/00222: {Physical properties, e.g. hardness} - A63B 37/0077: {Physical properties} - C08B 37/0015: {Inclusion compounds, i.e. host-guest compounds, e.g. polyrotaxanes} - C08G 18/246: {containing also tin-carbon bonds} - C08G 18/4202: {Two or more polyesters of different physical or chemical nature (C08G18/44 takes precedence)} - C08G 18/4277: {Caprolactone and/or substituted caprolactone} - C08G 18/792: {formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates} - C08G 83/007: {Polyrotaxanes; Polycatenanes} - C08L 5/16: Cyclodextrin; Derivatives thereof - C09D 131/04: Homopolymers or copolymers of vinyl acetate - C09D 175/06: from polyesters - C09D 175/08: from polyethers - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) - C08B: POLYSACCHARIDES; DERIVATIVES THEREOF (polysaccharides containing less than six saccharide radicals attached to each other by glycosidic linkages C07H; fermentation or enzyme-using processes C12P19/00; sugar industry C13; production of cellulose D21) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - 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 showing improved controllability on approach shots for less than 40 yards, in particular, on approach shots around the green (about 10 yards to 20 yards) and improved controllability on approach shots from the rough, and showing excellent shot feeling. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein a loss tangent tan δ has a peak temperature of 50° C. or less and a peak height of less than 0.8, obtained by measuring dynamic viscoelasticity of the paint film under the following conditions: Measuring mode: tensile mode Measuring temperature range: from −100° C. to 150° C. Temperature rising rate: 4° C./min Oscillation frequency: 10 Hz Measuring strain: 0.1. ## Claims ### Claim 1 A golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein the paint film contains a polyurethane as a resin component, and the polyurethane comprises, as a constituent component, (A) a polyisocyanate component containing an isocyanurate of hexamethylene diisocyanate and (B) a polyol component containing a polyrotaxane, wherein the polyrotaxane 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, and at least a portion of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain expressed by —(CO(CH2)5O)nH via —O—C3H6—O— group, wherein n represents the degree of polymerization and is a natural number of 2 to 70, and wherein a loss tangent tan δ has a peak temperature of 50° C. or less and a peak height of less than 0.8, obtained by measuring dynamic viscoelasticity of the paint film under the following conditions: Measuring mode: tensile mode Measuring temperature range: from −100° C. to 150° C. Temperature rising rate: 4° C./min Oscillation frequency: 10 Hz Measuring strain: 0.1%. ### Claim 2 (depends on 1) The golf ball according to claim 1, wherein the paint film has a storage modulus (E′) ranging from 5.0×106 dyn/cm2 to 1.0×109 dyn/cm2 at 23° C. ### Claim 3 (depends on 1) The golf ball according to claim 1, wherein the paint film has a loss modulus (E″) ranging from 1.0×105 dyn/cm2 to 6.0×107 dyn/cm2 at 23° C. ### Claim 4 (depends on 1) The golf ball according to claim 1, wherein the paint film has a 10% modulus of elasticity ranging from 2 kgf/cm2 to 130 kgf/cm2. ### Claim 5 (depends on 1) The golf ball according to claim 1, wherein the golf ball has a coefficient of friction of 0.48 or more, calculated using a contact force tester. ### Claim 6 (depends on 1) The golf ball according to claim 1, wherein the golf ball has a wet paper slit coefficient of friction of 0.18 or more, calculated using a contact force tester. ### Claim 7 (depends on 1) The golf ball according to claim 1, wherein the linear molecule of the polyrotaxane is polyethylene glycol, and the blocking group of the polyrotaxane is an adamantyl group. ### Claim 8 (depends on 1) The golf ball according to claim 1, wherein (B) the polyol component further contains at least one selected from the group consisting of a polyether polyol, a polyester polyol, a polycaprolactone polyol, a polycarbonate polyol, and an acrylic polyol. ### Claim 9 (depends on 1) The golf ball according to claim 1, wherein (B) the polyol component contains the polyrotaxane in an amount ranging from 10 mass % to 100 mass %. ### Claim 10 (depends on 1) The golf ball according to claim 1, wherein the paint film further contains a vinyl chloride-vinyl acetate copolymer and/or a modified product thereof as a resin component. ### Claim 11 (depends on 1) The golf ball according to claim 1, wherein the paint film further contains a modified silicone. ### Claim 12 (depends on 11) The golf ball according to claim 11, wherein the paint film contains the modified silicone in an amount ranging from 0.01 part by mass to 10 parts by mass, with respect to 100 parts by mass of the resin component. ### Claim 13 (depends on 10) The golf ball according to claim 10, wherein an amount of the vinyl chloride-vinyl acetate copolymer and/or the modified product thereof in the resin component constituting the paint film ranges from 4 mass % to 50 mass %. ### Claim 14 (depends on 1) The golf ball according to claim 1, wherein the paint film further contains a vinyl chloride-vinyl acetate copolymer and/or a modified product thereof as a resin component, and further contains a modified silicone. ### Claim 15 (depends on 14) The golf ball according to claim 14, wherein the paint film contains the modified silicone in an amount ranging from 0.01 part by mass to 10 parts by mass, with respect to 100 parts by mass of the resin component, and an amount of the vinyl chloride-vinyl acetate copolymer and/or the modified product thereof in the resin component constituting the paint film ranges from 4 mass % to 50 mass %. ### Claim 16 (depends on 1) The golf ball according to claim 1, wherein the golf ball comprises a core and a cover covering the core, and the cover has a hardness of 70 or less in Shore D hardness. ### Claim 17 (depends on 1) The golf ball according to claim 1, wherein the paint film has a storage modulus (E′) ranging from 5.0×106 dyn/cm2 to 1.0×109 dyn/cm2 at 23° C., a loss modulus (E″) ranging from 1.0×105 dyn/cm2 to 6.0×107 dyn/cm2 at 23° C., and a 10% modulus of elasticity ranging from 2 kgf/cm2 to 130 kgf/cm2; and the golf ball has a coefficient of friction of 0.48 or more, calculated using a contact force tester, and a wet paper slit coefficient of friction of 0.18 or more, calculated using a contact force tester. ### Claim 18 A golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein the paint film contains a polyurethane as a resin component, and the polyurethane comprises, as a constituent component, (A) a polyisocyanate component and (B) a polyol component containing a polyrotaxane and at least one selected from the group consisting of a polyether polyol, a polyester polyol, a polycaprolactone polyol, a polycarbonate polyol, and an acrylic polyol, wherein the polyrotaxane 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, and at least a portion of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain expressed by —(CO(CH2)5O)nH via —O—C3H6—O— group, wherein n represents the degree of polymerization and is a natural number of 2 to 70, and wherein a loss tangent tan δ has a peak temperature of 50° C. or less and a peak height of less than 0.8, obtained by measuring dynamic viscoelasticity of the paint film under the following conditions: Measuring mode: tensile mode Measuring temperature range: from −100° C. to 150° C. Temperature rising rate: 4° C./min Oscillation frequency: 10 Hz Measuring strain: 0.1%.