US5244969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Golf ball
Assignee: Dunlop Sports Co Ltd
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Filing: 1992-06-15
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Granted: 1993-09-14
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Expires: 2012-06-15
Abstract
Abstract Disclosed is a golf ball which is excellent in ball velocity, flying distance and low-temperature durability, by using an ionomer resin of an ethylene-acrylic acid copolymer as the cover resin. The golf ball comprises a core and a cover covering said core, the cover has a total neutralization degree of 30 to 60% of which at least 10% is neutralized with divalent metal ions and is prepared by mixing specific ethylene-acrylic copolymer type ionomer resins.
Inventors
- 👤 Mikio Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:49
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0869; C08L23/0876; A; A63; A63B; A63B37/00; A63B37/0003; A63B37/0023; A63B37/0024; A63B37/0029; A63B37/0036; A63B37/005; A63B37/0051; A63B37/0053; A63B37/007; A63B37/0072; A63B37/0074; A63B37/0077; A63B37/008; A63B37/0083; A63B37/0084; A63B37/0087; C08L2205/00; C08L2205/02; Y; Y10; Y10S; Y10S524/00; Y10S524/908
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
199 words
A golf ball comprising a core and a cover covering said core, said cover has a total neutralization degree of 30 to 60% of which at least 10% is neutralized with divalent metal ions and is prepared by mixing (A) an ionomer resin having a melt index of 0.5 to 5.0 g/10 min and a stiffness modulus of 3,000 to 5,000 Kg/cm 2 , prepared from a copolymer of about 16 to 25% by weight of acrylic acid and the balance of ethylene (hereinafter referred to as "ethylene-acrylic acid copolymer") of which 20 to 70 mol % of the carboxyl groups is neutralized with alkali metal ions, and said ethylene-acrylic acid copolymer before neutralization having a melt index of 20 to 150 g/10 min, and (B) an ionomer resin having a melt index of 0.5 to 5.0 g/10 min and a stiffness modulus of 2,000 to 4,500 Kg/cm 2 , prepared from an ethylene-acrylic acid copolymer of which 25 to 70 mol % of the carboxyl group is neutralized with divalent metal ions, and said ethylene-acrylic acid copolymer before neutralization having a melt index of 20 to 150 g/10 min, in a weight ratio (A/B) of 70/30 to 40/60.
Claim 2
Dependent Claim
199 words
A golf ball comprising a core and a cover covering said core, said cover has a total neutralization degree of 30 to 60% of which at least 10% is neutralized with divalent metal ions and is prepared by mixing (A) an ionomer resin having a melt index of 0.5 to 5.0 g/10 min and a stiffness modulus of 3,000 to 5,000 Kg/cm 2 , prepared from a copolymer of about 16 to 25% by weight of acrylic acid and the balance of ethylene (hereinafter referred to as "ethylene-acrylic acid copolymer") of which 20 to 70 mol % of the carboxyl groups is neutralized with alkali metal ions, and said ethylene-acrylic acid copolymer before neutralization having a melt index of 20 to 150 g/10 min, and (B) an ionomer resin having a melt index of 0.5 to 5.0 g/10 min and a stiffness modulus of 2,000 to 4,500 Kg/cm 2 , prepared from an ethylene-acrylic acid copolymer of which 25 to 70 mol % of the carboxyl group is neutralized with divalent metal ions, and said ethylene-acrylic acid copolymer before neutralization having a melt index of 20 to 150 g/10 min, in a weight ratio (A/B) of 70/30 to 40/60.
Claim 3
Dependent Claim
15 words
The golf ball according to claim 1 wherein said alkali metal is lithium or sodium.
Claim 4
Dependent Claim
19 words
The golf ball according to claim 1 wherein said divalent metal is zinc, copper or an alkali earth metal.
Claim 5
Dependent Claim
16 words
The golf ball according to claim 3 wherein said alkali earth metal is magnesium or calcium.
Claim 6
Dependent Claim
51 words
The golf ball according to claim 1 wherein said cover resin contained, in addition to the mixture of said ionomer resins (A) and (B), a component selected from a group consisting of an ethylene-methacrylic type ionomer resin, polyolefin, polyester elastomer or polyamide, in an amount of less than 20% by weight.
Claim 7
Dependent Claim
17 words
The golf ball according to claim 1 wherein said core is a solid core molded from rubber.
Claim 8
Dependent Claim
22 words
The golf ball according to claim 1 wherein said core is a thread-wound core prepared by winding rubber thread on a center.
References Cited (Backward Citations)
US3819768A
Cited
US4323247A
Cited
GB2144130A
Cited
JPS63229077A
Cited
FR2637810A1
Cited
US4911451A
Cited
EP0407049A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-13 | 1997-03-15 | 1997-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-13 | 2001-03-15 | 2001-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-13 | 2005-03-15 | 2005-09-14 | $7700.00 | Window Closed / Lapsed |