Transparent play ball containing shapes which temporarily stick to interior wall of ball
View Patent ↗A transparent polyurethane ball contains polyvinylchloride decorative shapes which cling temporarily to the interior surface of the ball.
1. A play ball comprising
a shell of at least partly clear or near transparent MDI-based polyurethane, and containing gas under pressure; and
a plurality of decorative shapes loose within and unconnected to the polyurethane shell, each shape comprising polyvinyl chloride, having a surface area of 0.3-0.7 square inches and a thickness of 0.005-0.015 inches,
said MDI-based polyurethane being adapted to and capable of causing the shapes of polyvinyl chloride to cling thereto,
whereby at least a few of said shapes stick, adhere or cling to the interior of the shell temporarily for at least several seconds before falling from the interior of the shell.
2. The ball of claim 1 further containing particles of glitter.
3. The ball of claim 1 having a diameter of 4-5 inches and containing 10-20 of said shapes.
4. The ball of claim 1 wherein said shapes are in the form of spider shapes or butterfly shapes.
5. The ball of claim 2 having a diameter of 4-5 inches and containing 10-20 of said shapes.
6. The ball of claim 5 wherein said shapes are in the form of spider shapes or butterfly shapes.
7. The ball of claim 1 wherein said decorative shapes are at least two different colors.
8. The ball of claim 1 wherein said MDI-based polyurethane comprises a polyol of a polyester and/or polyether with at least two functional OH groups and having a molecular height of from 1,000 to 10,000 daltons.
9. The ball of claim 1 wherein said shell is capable of withstanding a temperature of 200-300° C. and said gas under pressure is at an inflation pressure of 0.5-0.8 kfg/cm 2 .
10. The ball of claim 1 wherein said shell has a wall thickness of 3-5 mm.
11. The play ball of claim 1 having a spherical shape.
12. The play ball of claim 1 wherein said MDI-based polyurethane is an elastomer.
13. The ball of claim 8 wherein said polyurethane further comprises a chain extender having a molecular weight of about 50 to about 800, the chain extender having at least two functional OH groups or at least two NH 2 functional groups.
14. The ball of claim 8 having a melting point of 220° C. and a shore A hardness of about 70 to about 90.
15. The ball of claim 1 wherein said shell has a shore A hardness of 72, a specific gravity or density of 1.17, and tensile strength of 45 MPa, an 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 T g of minus 52° C.