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US5994470A Expired / Lapsed US ⏱️ 0.0 years remaining

Golf ball

Assignee: Dunlop Sports Co Ltd
•
Filing: 1995-12-08
•
Granted: 1999-11-30
•
Expires: 2015-12-08
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Abstract

Abstract Disclosed is a golf ball having excellent shot feel, control properties as well as satisfactory flight performance and cut resistance. The golf ball of the present invention has a core and a cover for covering the core, wherein the cover has a stiffness modulus of 100 to 250 MPa, and is prepared from a resin composition comprising, as a base resin, a mixture of the following resin (A) and resin (B) in a weight ratio of 60:40 to 90:10: resin (A): an ionomer resin (i) obtained by neutralizing with metal ion at least a part of carboxyl groups in a copolymer of ethylene and an α, β-unsaturated carboxylic acid, or a mixture of the ionomer resin (i) and an ionomer resin (ii) obtained by neutralizing with metal ion at least a part of carboxyl groups in a terpolymer of ethylene, an α, β-unsaturated carboxylic acid and an α, β-unsaturated carboxylate, and resin (B): a thermoplastic elastomer comprising a polyamide portion as a hard segment, having a Shore D hardness of 20 to 40 and a stiffness modulus of 10 to 50 MPa.

Inventors

  • 👤 Hiroaki Tanaka
  • 👤 Yoshikazu Yabuki
  • 👤 Yoshinori Sano

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 00:00
CPC Classifications
A; A63; A63B; A63B37/00; A63B37/0003; A63B37/0022; A63B37/005; A63B37/0051; A63B37/0053; A63B37/007; A63B37/0072; A63B37/0075

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 174 words
A golf ball having a core and a single layer cover for covering the core, wherein said cover has a stiffness modulus of 100 to 250 MPa, and is prepared from a resin composition comprising, as a base resin, a mixture of the following resin (A) and resin (B) in a weight ratio of 60:40 to 90:10: resin (A): an ionomer resin (i) obtained by neutralizing with metal ion at least a part of carboxyl groups in a copolymer of ethylene and an α, β-unsaturated carboxylic acid, or a mixture of the ionomer resin (i) and an ionomer resin (ii) obtained by neutralizing with metal ion at least a part of carboxyl groups in a terpolymer of ethylene, an α, β-unsaturated carboxylic acid and an α, β-unsaturated carboxylate, and resin (B): a thermoplastic elastomer which is a polyether-polyamide block copolymer comprising a polyamide portion as a hard segment and a polyether component as a soft segment, having a Shore D hardness of 20 to 40 and a stiffness modulus of 10 to 50 MPa.
Claim 2
Dependent Claim 174 words
A golf ball having a core and a single layer cover for covering the core, wherein said cover has a stiffness modulus of 100 to 250 MPa, and is prepared from a resin composition comprising, as a base resin, a mixture of the following resin (A) and resin (B) in a weight ratio of 60:40 to 90:10: resin (A): an ionomer resin (i) obtained by neutralizing with metal ion at least a part of carboxyl groups in a copolymer of ethylene and an α, β-unsaturated carboxylic acid, or a mixture of the ionomer resin (i) and an ionomer resin (ii) obtained by neutralizing with metal ion at least a part of carboxyl groups in a terpolymer of ethylene, an α, β-unsaturated carboxylic acid and an α, β-unsaturated carboxylate, and resin (B): a thermoplastic elastomer which is a polyether-polyamide block copolymer comprising a polyamide portion as a hard segment and a polyether component as a soft segment, having a Shore D hardness of 20 to 40 and a stiffness modulus of 10 to 50 MPa.
Claim 3
Dependent Claim 34 words
The golf ball according to claim 1, wherein the resin (A) is a mixture of an ionomer resin neutralized with a monovalent metal ion and an ionomer resin neutralized with a divalent metal ion.
Claim 4
Dependent Claim 18 words
The golf ball according to claim 2, wherein the α, β-unsaturated carboxylate is alkyl acrylate or alkyl methacrylate.
Claim 5
Dependent Claim 20 words
The golf ball according to claim 1 wherein said core is either a solid core or a thread wound core.
Claim 6
Dependent Claim 25 words
The golf ball according to claim 1, wherein the mixing ratio of resin (A) to the thermoplastic polyamide elastomer resin (B) is 70:30 to 85:15.
Claim 7
Dependent Claim 19 words
The golf ball according to claim 1, wherein the α, β-unsaturated carboxylic acid is acrylic acid or methacrylic acid.
Claim 8
Dependent Claim 18 words
The golf ball according to claim 1, wherein the α, β-unsaturated carboxylate is alkyl acrylate or alkyl methacrylate.
Claim 9
Dependent Claim 19 words
The golf ball according to claim 1, further comprising a paint coating over the cover of the golf ball.

References Cited (Backward Citations)

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US4884814B1 Cited
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JPH06192512A Cited
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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2002-11-29 2003-05-31 2003-11-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2006-11-29 2007-05-31 2007-11-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2010-11-29 2011-05-31 2011-11-30 $7700.00 Window Closed / Lapsed

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