| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ball for a ball game which can suppress damage on a ball surface caused when it is hit or it falls to the minimum and is excellent in break durability. <P>SOLUTION: In the ball for the ball game having a diameter of 50 to 70 mm and having its surface part formed mainly by resin materials, 0.01 to 10 mass part of inorganic composite materials obtained by coating glass flakes with metal or metal oxide are blended to a resin material of 100 parts by mass of the ball surface part. Balls of a single layer and multilayer structure are manufactured by a foam molding or injection molding. Also, the aspect ratio of the inorganic composite materials ranges from 6 to 40. <P>COPYRIGHT: (C)2008,JPO&INPIT |
