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A sport ball may include a casing, a bladder, and a valve. The casing forms at least a portion of an exterior surface of the ball. The bladder is located within the casing for enclosing a pressurized fluid, and the bladder may be formed from a material that includes a first layer of thermoplastic po

A sport ball may include a casing, a bladder, and a valve. The casing forms at least a portion of an exterior surface of the ball. The bladder is located within the casing for enclosing a pressurized fluid, and the bladder may be formed from a material that includes a first layer of thermoplastic polymer material and a second layer of a barrier material. The valve is for introducing the fluid to the bladder, and the valve is secured to the bladder and accessible from an exterior of the casing. A tie layer may be located between the flange and a surface of the bladder to join the flange to the bladder.

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1. A sport ball comprising: a casing that forms at least a portion of an exterior surface of the ball;a bladder located within the casing for enclosing a pressurized fluid, the bladder being at least partially formed from a first thermoplastic polymer material;a valve for introducing the fluid to th

1. A sport ball comprising: a casing that forms at least a portion of an exterior surface of the ball;a bladder located within the casing for enclosing a pressurized fluid, the bladder being at least partially formed from a first thermoplastic polymer material;a valve for introducing the fluid to the bladder, the valve being formed from a thermoset polymer material and defining a flange that lays parallel to a surface of the bladder; anda tie layer located between the flange and the surface of the bladder, the tie layer being formed from a second thermoplastic polymer material, and the tie layer joining the flange to the surface of the bladder;wherein the tie layer is joined to the flange with an adhesive bond, and the tie layer is joined to the bladder with a thermal bond. 2. The sport ball recited in claim 1, wherein the first thermoplastic polymer material and the second thermoplastic polymer material are thermoplastic urethane. 3. The sport ball recited in claim 1, wherein the bladder includes a first layer and a second layer, the first layer being formed from the first thermoplastic polymer material, and the second layer being formed from ethylene-vinyl alcohol copolymer. 4. The sport ball recited in claim 3, wherein the first thermoplastic polymer material is a thermoplastic urethane. 5. The sport ball recited in claim 4, wherein the thermoplastic urethane is selected from a group consisting of polyester, polyether, polycaprolactone, polyoxypropylene and polycarbonate macroglycol based materials, and mixtures thereof. 6. The sport ball recited in claim 3, wherein the first layer is located exterior of the second layer. 7. The sport ball recited in claim 1, wherein the thermoset polymer material is rubber. 8. The sport ball recited in claim 1, wherein a portion of at least one of the tie layer and the bladder is diffused across a boundary layer between the tie layer and the bladder, thereby forming the thermal bond. 9. The sport ball recited in claim 1, wherein a restriction structure is located between the casing and the bladder. 10. The sport ball recited in claim 1, wherein the casing includes a vulcanized rubber element. 11. The sport ball recited in claim 10, wherein the vulcanized rubber element is molded around the bladder. 12. A sport ball comprising: a casing that forms at least a portion of an exterior surface of the ball, the casing defining an aperture;a bladder located within the casing for enclosing a pressurized fluid, the bladder including a first layer and a second layer, the first layer being formed of a thermoplastic polymer material and the second layer being formed of an ethylene-vinyl alcohol copolymer;a valve accessible through the aperture of the casing for introducing the fluid to the bladder, the valve being formed from a rubber material and defining a flange that lays parallel to a surface of the bladder; anda tie layer located between the flange and the surface of the bladder, the tie layer being formed from a second thermoplastic polymer material, and the tie layer joining the flange to the surface of the bladder;wherein the tie layer is joined to the flange with an adhesive bond, and the tie layer is joined to the first layer of the bladder with a thermal bond. 13. The sport ball recited in claim 12, wherein the thermoplastic polymer material is a thermoplastic urethane. 14. The sport ball recited in claim 13, wherein the thermoplastic urethane is selected from a group consisting of polyester, polyether, polycaprolactone, polyoxypropylene and polycarbonate macroglycol based materials, and mixtures thereof. 15. The sport ball recited in claim 12, wherein the bladder includes a third layer, the third layer being formed of the thermoplastic polymer material, wherein the second layer is located between the first layer and the third layer. 16. The sport ball recited in claim 12, wherein the first layer is located exterior of the second layer. 17. The sport ball recited in claim 12, wherein a portion of at least one of the tie layer and the first layer of the bladder is diffused across a boundary layer between the tie layer and the bladder, thereby forming the thermal bond. 18. The sport ball recited in claim 12, wherein a restriction structure is located between the casing and the bladder. 19. The sport ball recited in claim 12, wherein the casing includes a vulcanized rubber element. 20. The sport ball recited in claim 19, wherein the vulcanized rubber element is molded around the bladder.