Amusement devices: games – Board games – pieces – or boards therefor – Electrical
Patent
1988-07-25
1990-04-24
Marlo, George J.
Amusement devices: games
Board games, pieces, or boards therefor
Electrical
273218, A63B 3712
Patent
active
049194348
ABSTRACT:
Disclosed herein is a two-piece type solid golf ball formed by enclosing a solid core with a thermoplastic resin cover. It provides a long overall distance, improved controlability, extended durability, and good shot feeling. The solid core contains polybutadiene having more than 40% of cis-1,4 bonds and an unsaturated carboxylic acid and/or a metal salt thereof to crosslink the polybutadiene and deforms 1.5 to 3.5 mm under a constant load of 100 kg. The cover is 0.4 to 2.2 mm thick and consists of a 0.1 to 2 mm thick inner layer and a 0.1 to 1.5 mm thick outer layer enclosing the inner layer, both made of thermoplastic resins, said inner layer generating a stress of 20 to 100 kg/cm.sup.2 at 10% elongation and having a resilience higher than 40%, and said outer layer having a flexural modulus of 2000 to 5000 kg/cm.sup.2 and a resilience higher than 35%.
REFERENCES:
patent: 3458205 (1969-07-01), Smith et al.
patent: 4090716 (1978-05-01), Martin et al.
patent: 4337946 (1982-07-01), Saito et al.
patent: 4431193 (1984-02-01), Nesbitt
patent: 4570937 (1986-02-01), Yamada
ASTM-D638, "Standard Test Method for Tensile Properties of Plastics", pp. 210-227.
ASTM-D790, "Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials", pp. 389-401.
Bridgestone Corporation
Marlo George J.
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