Golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsHiroshi Higuchi, Nobuyuki Kataoka, Hiroyuki Nagasawa, Atsushi Nanba
Life of this patent
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Abstract
A golf ball is manufactured by molding and vulcanizing a rubber composition comprising 100 pbw of a base rubber composed primarily of a polybutadiene having a cis-1,4 content of at least 60 wt % and a Mooney viscosity of at least 30 and synthesized using a rare-earth catalyst, 15–50 pbw of an unsaturated carboxylic acid and/or a metal salt thereof, at least 2 pbw of a processing aid having a highest melting point of up to 115° C., and 1–5 pbw of an organic peroxide. The golf ball can be efficiently manufactured and has excellent rebound characteristics.
Claims16
A golf ball, comprising a molded and vulcanized product of a rubber composition as a constituent component, the rubber composition comprising:
- 100 parts by weight of a base rubber composed primarily of a polybutadiene containing at least 60% by weight of cis-1,4-bond, having a Mooney viscosity (ML1+4 (100° C.)) of at least 30, and synthesized using a rare-earth catalyst;
- 15 to 50 parts by weight of an unsaturated carboxylic acid and/or a metal salt thereof;
- at least 2 parts by weight of a processing aid having a melting point of 60 to 115° C.;
- 1.2 to 5 parts by weight of an organic peroxide;
- and
- 0.2 to 5 parts by weight of an organosulfur compound,
- wherein the processing aid comprises a mixture of a metal salt of higher fatty acid primarily containing a metal salt of saturated fatty acid and at least one compound selected from the group consisting of (i) higher fatty acid metal salts, (ii) metal complexes, (iii) aliphatic hydrocarbons, (iv) fatty acid esters, and (v) aliphatic alcohols.
A golf ball, comprising a molded and vulcanized product of a rubber composition as a constituent component, the rubber composition comprising:
- 100 parts by weight of a base rubber composed primarily of a polybutadiene containing at least 60% by weight of cis-1,4-bond, having a Mooney viscosity (ML1+4 (100° C.)) of at least 30, and synthesized using a rare-earth catalyst;
- 15 to 50 parts by weight of an unsaturated carboxylic acid and/or a metal salt thereof;
- at least 2 parts by weight of a processing aid having a melting point of 60 to 115° C.;
- 1 to 5 parts by weight of an organic peroxide;
- and
- 0.2 to 5 parts by weight of an organosulfur compound;
- wherein the processing aid comprises a mixture of a metal complex and at least one compound selected from the group consisting of (i) higher fatty acid metal salts, (ii) aliphatic hydrocarbons, (iii) fatty acid esters, and (iv) aliphatic alcohols.
A golf ball, comprising a molded and vulcanized product of a rubber composition as a constituent component, the rubber composition comprising:
- 100 parts by weight of a base rubber composed primarily of a polybutadiene containing at least 60% by weight of cis-1,4-bond, having a Mooney viscosity (ML1+4 (100° C. )) of at least 30, and synthesized using a rare-earth catalyst;
- 15 to 50 parts by weight of an unsaturated carboxylic acid and/or a metal salt thereof;
- at least 2 parts by weight of a processing aid having a melting point of 60 to 115° C.;
- 1 to 5 parts by weight of an organic peroxide;
- and
- 0.2 to 5 parts by weight of an organosulfur compound;
- wherein the processing aid comprises a mixture of an aliphatic hydrocarbon and at least one compound selected from the group consisting of (i) higher fatty acid metal salts, (ii) metal complexes, (iii) fatty acid esters, and (iv) aliphatic alcohols.
A golf ball, comprising a molded and vulcanized product of a rubber composition as a constituent component, the rubber composition comprising:
- 100 parts by weight of a base rubber composed primarily of a polybutadiene containing at
- least 60% by weight of cis-1,4-bond, having a Mooney viscosity (ML1+4 (100° C.)) of at least 30, and synthesized using a rare-earth catalyst;
- 15 to 50 parts by weight of an unsaturated carboxylic acid and/or a metal salt thereof;
- at least 2 parts by weight of a processing aid having a melting point of 60 to 115° C.;
- 1.2 to 5 parts by weight of an organic peroxide;
- and
- 0.2 to 5 parts by weight of an organosulfur compound,
- wherein the processing aid comprises a mixture of a fatty acid ester and at least one compound selected from the group consisting of (i) higher fatty acid metal salts, (ii) metal complexes, (iii) aliphatic hydrocarbons, (iv) fatty acid esters, and (v) aliphatic alcohols.
A golf ball, comprising a molded and vulcanized product of a rubber composition as a constituent component, the rubber composition comprising:
- 100 parts by weight of a base rubber composed primarily of a polybutadiene containing at least 60% by weight of cis-1,4-bond, having a Mooney viscosity (ML1+4 (100° C.)) of at least 30, and synthesized using a rare-earth catalyst;
- 15 to 50 parts by weight of an unsaturated carboxylic acid and/or a metal salt thereof;
- at least 2 parts by weight of a processing aid having a melting point of 60 to 115° C.;
- 1 to 5 parts by weight of an organic peroxide;
- and
- 0.2 to 5 parts by weight of an organosulfur compound;
- wherein the processing aid comprises a mixture of an aliphatic alcohol and at least one compound selected from the group consisting of (i) higher fatty acid metal salts, (ii) metal complexes, (iii) aliphatic hydrocarbons, and (iv) fatty acid esters.
A golf ball, comprising a molded and vulcanized product of a rubber composition as a constituent component, the rubber composition comprising:
- 100 parts by weight of a base rubber composed primarily of a polybutadiene containing at least 60% by weight of cis-1,4-bond, having a Mooney viscosity (ML1+4 (100° C.)) of at least 30, and synthesized using a rare-earth catalyst;
- 15 to 50 parts by weight of an unsaturated carboxylic acid and/or a metal salt thereof;
- at least 2 parts by weight of a processing aid having a melting point of 60 to 115° C.;
- and
- 1 to 5 parts by weight of an organic peroxide;
- wherein the processing aid comprises a mixture of 2,2′-dibenzamido-diphenyl disulfide and at least one compound selected from the group consisting of (i) higher fatty acid metal salts, (ii) metal complexes, (iii) aliphatic hydrocarbons, (iv) fatty acid esters, and (v) aliphatic alcohols.
Dependencies are inferred from the claim text.