# US 4,398,000 A · Golf ball

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- Number: US 4,398,000 A
- Document ID: US4398000A
- Status: Granted
- Kind: A
- Application number: 06/291,046
- Filed: 1981-08-07
- Granted: 1983-08-09
- Earliest claimed: 1980-08-13
- Assignees: Bridgestone Tire Company Limited; Toray Industries, Inc.
- Inventors: Nobuyuki Kataoka; Tasuku Saito; Tsutomu Matsunaga; Chiaki Tanaka; Yoko Furuta; Nagayoshi Naito
- Web page: https://patentgrep.com/patent/US4398000A

## CPC

- A63B 37/12: Special coverings {, i.e. outer layer material (balls with finger holes A63B37/0001, golf ball covers A63B37/0023)}
- A63B 37/0024: {Materials other than ionomers or polyurethane}
- A63B 37/0074: {Two piece balls, i.e. cover and core}
- C08G 63/672: Dicarboxylic acids and dihydroxy compounds
- Y10S 525/902: Core-shell
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A solid type golf ball comprising a central core and an outer cover for the core and having an excellent flight performance and durability and acceptable "click" characteristics is presented. The main component of the outer cover of this golf ball is a polyetherester block copolymer containing the following X, Y and Z units: X: Butylene terephthalate unit Y: Ester unit other than butylene terephthalate Z: Polyetherester unit derived from a dicarboxylic acid component containing terephthalic acid and poly(alkylene oxide) glycol having a number average molecular weight of 400 through 3000, wherein the X, Y and Z units are present in the following amounts: 30% by weight .ltoreq.X.ltoreq.80% by weight 0% by weight .ltoreq.Y.ltoreq.50% by weight 20% by weight .ltoreq.Z.ltoreq.70% by weight.

## Claims

### Claim 1

In a solid type golf ball comprising a central core and an outer cover for the core, the improvement wherein the main component of the outer cover is at least one polyetherester block copolymer containing the following X, Y and Z units:
X: Butylene terephthalate unit
Y: Ester unit other than butylene terephthalate
Z: Polyetherester unit derived from a dicarboxylic acid component containing terephthalic acid and poly(alkylene oxide) glycol, having a number average molecular weight of 400 through 3000, wherein the X, Y and Z units are present in the following amounts:
30% by weight.ltoreq.X.ltoreq.80% by weight
0% by weight.ltoreq.Y.ltoreq.50% by weight
20% by weight.ltoreq.Z.ltoreq.70% by weight.

### Claim 2 (depends on 1)

A golf ball as claimed in claim 1, wherein the amounts of X, Y and Z units in the polyetherester block copolymer are:
40% by weight.ltoreq.X.ltoreq.70% by weight
0% by weight.ltoreq.Y.ltoreq.30% by weight
30% by weight.ltoreq.Z.ltoreq.60% by weight.

### Claim 3 (depends on 1)

A golf ball as claimed in claim 1, wherein said polyetherester block copolymer has a stress at 10% elongation of 40 through 200 Kg/cm.sup.2.

### Claim 4

A solid type golf ball comprising a central core and an outer cover for the core, wherein the main component of the outer cover is at least one polyetherester block copolymer containing the following X, Y and Z units:
X: Butylene terephthalate unit
Y: Ester unit other than butylene terephthalate
Z: Polyetherester unit derived from a dicarboxylic acid component containing terephthalic acid and poly(alkylene oxide) glycol, having a number average molecular weight of 400 through 3000, wherein the X, Y and Z units are present in the following amounts:
30% by weight.ltoreq.X.ltoreq.80% by weight
0% by weight.ltoreq.Y.ltoreq.50% by weight
20% by weight.ltoreq.Z.ltoreq.70% by weight.