Patent US5540688A successfully refreshed from Google Patents.
US5068151A
Expired / Lapsed
US
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Golf ball
Assignee: Sumitomo Rubber Industries Ltd
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Filing: 1990-02-02
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Granted: 1991-11-26
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Expires: 2010-02-02
Abstract
Abstract Disclosed is a golf ball having improved impact resilience, which comprises a core and a cover covering the core, wherein the cover is a lithium neutralized ionomer resion which is a copolymer of 10 to 20% by weight of an alpha, beta-unsaturated carboxylic acid and the rest of ethylene, of which 20 to 70 mol % of carboxyl groups are neutralized with lithium ion, and the ionomer resin has a melt index of 0.5 to 5.0 and a shore D hardness of at least 60. The lithium neutralized ionomer resin may be combined with a di- or tri- valent metal neutralized ionomer resin which is a copolymer of 10 to 20% by weight of an alpha, beta-unsaturated carboxylic acid and the rest of ethylene, of which 40 to 70 mol % of carboxyl groups are neutralized with di- or tri- valent metal ion, and which has a melt index of 0.5 to 5.0 and a shore D hardness of 60 to 80.
Inventors
- 👤 Yoshinobu Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:30
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; A; A63; A63B; A63B37/00; A63B37/0003; A63B37/0023; A63B37/0024; A63B37/0029; A63B37/0031; A63B37/0036; A63B37/007; A63B37/0072; A63B37/0074; A63B37/0077; A63B37/0078; A63B37/008; A63B37/0087; A63B37/0094; C08L2205/00; C08L2205/02; C08L23/0846; C08L23/0869; C08L23/0876; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A golf ball comprising a core and a cover covering said core, wherein said cover is a lithium neutralized ionomer resin which is a copolymer of 10 to 20% by weight of an alpha, beta-unsaturated carboxylic acid and the rest of ethylene, of which 20 to 70 mol % of carboxyl groups are neutralized with lithium ion, and said ionomer resin has a melt index of 0.8 to 3.0 and a shore D hardness of 60 to 80.
Claim 2
Dependent Claim
78 words
A golf ball comprising a core and a cover covering said core, wherein said cover is a lithium neutralized ionomer resin which is a copolymer of 10 to 20% by weight of an alpha, beta-unsaturated carboxylic acid and the rest of ethylene, of which 20 to 70 mol % of carboxyl groups are neutralized with lithium ion, and said ionomer resin has a melt index of 0.8 to 3.0 and a shore D hardness of 60 to 80.
Claim 3
Dependent Claim
29 words
The golf ball according to claim 1 wherein said lithium neutralized ionomer resin has carboxyl groups neutralized with lithium ion in an amount of 20 to 50 mol %.
Claim 4
Dependent Claim
32 words
The golf ball according to claim 1 wherein said lithium neutralized ionomer resin is prepared by treating a sodium neutralized ionomer resin to remove sodium ion and then mixing lithium ion sources.
Claim 5
Dependent Claim
20 words
The golf ball according to claim 3 wherein said lithium ion sources are lithium hydroxide, lithium carbonate and lithium acetate.
Claim 6
Dependent Claim
108 words
A golf ball comprising a core and a cover covering said core, wherein said cover is a mixture of the lithium neutralized ionomer resin according to claim 1 with 10 to 90% by weight of a di- or tri- valent metal neutralized ionomer resin which is a copolymer of 10 to 20% by weight of an alpha, beta-unsaturated carboxylic acid and the rest of ethylene, of which 40 to 70 mol % of carboxyl groups are neutralized with divalent metal ion, and the di- or tri- valent metal neutralized ionomer resin has a melt index of 0.5 to 5.0 and a shore D hardness of 60 to 80.
Claim 7
Dependent Claim
25 words
The golf ball according to claim 5 wherein said di- or tri- valent metal neutralized ionomer resin has a melt index of 0.7 to 2.0.
Claim 8
Dependent Claim
37 words
The golf ball according to claim 5 wherein said di- or tri- valent metal neutralized ionomer resin has carboxyl groups neutralized with di- or tri- valent metal ion in an amount of 40 to 60 mol %.
Claim 9
Dependent Claim
40 words
The golf ball according to claim 5 wherein said di- or tri- valent metal neutralized ionomer resin is prepared by treating a sodium neutralized ionomer resin to remove sodium ion and then mixing di- or tri- valent metal ion sources.
Claim 10
Dependent Claim
26 words
The golf ball according to claim 5 wherein said di- or tri- valent metal ion sources are zinc carbonate, zinc acetate, magnesium carbonate and magnesium acetate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |