| 摘要 |
A rotationally moulded hollow article e.g. a playball is formed of a mixture of plastics pellets and powder both of which are copolymers of ethylene and vinyl acetate, having a predetermined range of pellet to powder mixture ratio of 50 to 80% by weight of pellets to 50 to 20% by weight of powder, and with such mixture having a predetermined melt index range of 10 to 50. The article is characterized by having substantial "bounce" characteristics generally equivalent to those possessed by hollow, non-cellular articles made of known thermoplastics compositions or known rubber-like compositions of natural and/or synthetic polymers, as well as those possessed by solid cellular articles made from other known thermoplastics or from known rubber-like compositions of natural or synthetic polymers. |
