Patent EP0443706A2 successfully refreshed from Google Patents.
EP0443706A2
Expired / Lapsed
EP
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Golf ball
Assignee: Sumitomo Rubber Industries Ltd
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Filing: 1991-01-09
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Granted: —
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Expires: 2011-01-09
Abstract
Abstract A golf ball which has an excellent ball velocity, flight distance and low-temperature durability, uses an ionomer resin of an ethylene-acrylic acid copolymer as the cover resin. The golf ball comprises a core and a cover covering the core, the cover having a total neutralization degree of 30 to 60%, of which at least 10% is neutralized with divalent metal ions, and being prepared by mixing specificethylene-acrylic copolymer type ionomer resins.
Inventors
- 👤 Mikio Yamada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 03:56
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; A63B37/007; A63B37/0072; A63B37/0074; A63B37/0077; A63B37/0084; C08L2205/00; C08L2205/02; C08L2310/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
175 words
A golf ball comprising a core and a cover covering the core, the cover having a total neutralization degree of 30 to 60%, of which at least 10% is neutralized with divalent metal ions, and being 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 at least 3,000 Kg/cm², prepared from an ethylene-acrylic acid copolymer of which 20 to 70 mol % of the carboxyl groups is neutralized with alkali metal ions, and the 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 at least 1,500 Kg/cm², prepared from an ethylene-acrylic acid copolymer of which 25 to 70 mol % of the carboxyl groups is neutralised with divalent metal ions, and the ethylene-acrylic acid copolymer before neutralization having a melt index of 20 to 150 g/10 min, in a weight ratio (A/B) of 80/20 to 30/70.
Claim 2
Dependent Claim
16 words
A golf ball as claimed in claim 1 wherein the alkali metal is lithium or sodium.
Claim 3
Dependent Claim
23 words
A golf ball as claimed in claim 1 to claim 2 wherein the divalent metal is zinc, copper or an alkaline earth metal.
Claim 4
Dependent Claim
17 words
A golf ball as claimed in claim 3 wherein the alkaline earth metal is magnesium or calcium.
Claim 5
Dependent Claim
43 words
A golf ball as claimed in any one of the preceding claims wherein the ionomer resin (A) has a neutralization degree of 30 to 60%, a melt index of 0.5 to 5.0 g/10 min and a stiffness modulus of 3,000 to 5,000 Kg/cm².
Claim 6
Dependent Claim
43 words
A golf ball as claimed in any one of the preceding claims wherein the ionomer resin (B) has a neutralization degree of 35 to 60%, a melt index of 0.5 to 5.0 g/10 min and a stiffness modulus of 1,500 to 4,500 Kg/cm².
Claim 7
Dependent Claim
25 words
A golf ball as claimed in any one of the preceding claims wherein the ionomer resin (A/B) is within the range of 70/30 to 40/60.
Claim 8
Dependent Claim
48 words
A golf ball as claimed in any one of the preceding claims wherein the cover resin contains, in addition to the mixture of the ionomer resins (A) and (B), an ethylene-methacrylic type ionomer resin, polyolefin, polyester elastomer or polyamide in an amount of less than 20% by weight.
Claim 9
Dependent Claim
39 words
A golf ball as claimed in any one of the preceding claims wherein the core is either a solid core which is moulded from rubber, or a thread-wound core which is prepared by winding rubber thread onto a centre.
References Cited (Backward Citations)
No citation records indexed.
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