Cores for tennis balls

Details Cores for tennis balls Cores for tennis balls

1979-11-16

1981-12-22

Lieberman, Allan

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

273DIG10, 260 3, 260 4R, 26099814, 525211, A63B 3900

Patent

active

043067190

ABSTRACT:
A core for a tennis-ball, the tennis-ball having either an internal pressure substantially equal to atmospheric pressure (a "pressureless" ball) or an internal pressure of up to 7 p.s.i. (0.49 Kg.cm.sup.-2) above atmospheric pressure (a "low-pressure" ball), in which the core is made from a rubber composition wherein up to 60% by weight of the total polymer content comprises either a copolymer of ethylene and propylene (an EPM elastomer) or a terpolymer of ethylene, propylene and up to 12% by weight of a non-conjugated diene monomer (an EPDM elastomer). The most suitable EPM and EPDM elastomers are those containing 70 mole percent or more ethylene.

REFERENCES:
patent: 4008190 (1977-02-01), Taylor et al.
patent: 4031169 (1977-06-01), Morris
patent: 4036912 (1977-07-01), Stricharczuk
patent: 4089820 (1978-05-01), Wright
patent: 4145045 (1979-03-01), Pocklington

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