High bounce structure: sky ball
View Patent ↗A play ball having a high bounce capacity of at least 20 vertical feet and as much as 50 or 75 vertical feet is formed of a solid, elastomer thermoplastic polyurethane having a wall thickness of 3-5 mm, containing gas at a pressure preferably greater than 0.65 kfg/cm 2 .
1. An amusement ball comprising
a hollow shell of a solid, rubbery and elastic material formed of a soft, highly elastic polyester-based thermoplastic polyurethane resin,
the hollow shell having a wall thickness of 3-5 mm,
the ball being filled with a gas under a pressure of greater than 0.65 up to 0.8 kgf/cm 2 , and
the ball being characterized in having a bounce capability such that when thrown downward it can bounce up to over 20 feet vertically;
wherein the soft, highly elastic polyester-based thermoplastic polyurethane resin is a polyester/MDI-based thermoplastic polyurethane resin having a tensile strength of at least about 45 MPa, an ultimate elongation of at least about 700%, and a shore A hardness of 70-90, and
wherein said amusement ball is transparent or translucent.
2. The amusement ball of claim 1 characterized in that it can bounce upwardly to over 35 feet vertically.
3. The amusement ball of claim 1 characterized in that it can bounce upwardly to over 50 feet vertically.
4. An amusement ball comprising
a hollow shell of a solid, rubbery and elastic material,
the hollow shell having a wall thickness of 3-5 mm,
the ball being filled with a gas under a pressure of 0.5-0.8 kgf/cm 2 , and
the ball being characterized in having a bounce capability such that when thrown downward it can bounce up to over 20 feet vertically;
wherein the shell is formed of a methylene diphenyl diisocyanate and polyol reaction product comprising approximately 25 wt % of the methylene diphenyl diisocyanate and 70 wt % of the polyol, the polyol having a molecular weight of 1000-10,000, and optionally about 5 wt % of a chain extender having a molecular weight of 50-800, the polyurethane reaction product having a density of about 1.1 to about 1.2 g/cm 3 and a Shore A hardness of 70-90.
5. An amusement ball comprising
a hollow shell of a solid, rubbery and elastic material,
the hollow shell having a wall thickness of 3-5 mm,
the ball being filled with a gas under a pressure of 0.5-0.8 kgf/cm 2 , and
the ball being characterized in having a bounce capability such that when thrown downward it can bounce up to over 20 feet vertically;
wherein the shell is formed of a polyester based thermoplastic polyurethane resin having a Shore A hardness of 72, a specific gravity of 1.17, a tensile strength of 45 MPa, and ultimate elongation of 700%, a tensile stress at 100% elongation of 4 MPa, a tensile stress at 300% elongation of 6 MPa, a Graves tear strength of 7.9 kg/mm, and a glass transition temperature of −52° C.
6. The amusement ball of claim 2 , having a diameter of approximately 9.2 cm.