The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 2009
Filed:
Jul. 27, 2007
Jun Shindo, Chichibu, JP;
Eiji Takehana, Chichibu, JP;
Kae Yamazaki, Chichibu, JP;
Bridgestone Sports Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a golf ball having a core and a cover of one or more layer. The core is made of a material obtained by molding under heat a rubber composition containing (a) polybutadiene having a stress relaxation time (T) of 3.5 or less, (b) an unsaturated carboxylic acid and/or a metal salt thereof, and (c) an organic peroxide. A least one layer of the cover is made of a heated mixture which includes (A) an olefin-unsaturated carboxylic acid random copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymer, (B) a fatty acid having a molecular weight of at least 280 or a derivative thereof, and (C) a basic inorganic metal compound capable of neutralizing acid groups in components A and B. The golf ball can be efficiently manufactured, and synergistic effects between the core material and the cover material enhance the rebound of the ball.