Claims
- 1. In a golf club comprising a shaft and a club head, the improvement which comprises a polyurethane striking plate of about 1/4 inch thickness and a hardness of from about 40 to about 75 on the Shore Durometer D Scale according to ASTM Standard D 2240 affixed to the striking face of the club head, said polyurethane being a cured reaction product of components consisting essentially of a prepolymer consisting essentially of a polytetramethylene ether glycol combined with toluene diisocyanate and having about 9.5% free isocyanate, and a curing agent for the prepolymer selected from the group consisting of tetrafunctional polyols and 4,4'-methylene-bis-2-chloroaniline, and wherein the prepolymer and the curing agent are in an equivalent weight ratio of about 1:1 for the tetrafunctional polyols and about 1.2:1 for the 4,4'-methylene-bis-2-chloroaniline.
Parent Case Info
This is a continuation of application Ser. No. 122,753, filed Mar. 10, 1971 and now abandoned.
US Referenced Citations (11)
Continuations (1)
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Number |
Date |
Country |
Parent |
122753 |
Mar 1971 |
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