Foam cushion for headphones
A composite foam cushion for a sound control device. The cushion includes a core formed of a polymeric foam material and a polymeric coating overlying at least a portion of the core of polymeric foam material. The polymeric coating includes an outer coating layer and an inner polymeric coating layer bonded to the core of polymeric foam material. The inner coating layer may provide the cushion with strength, while providing a high degree of flexibility and suppleness to closely conform around contours and obstructions. The outer coating layer may provide the cushion with enhanced abrasion resistance and/or chemical resistance while having an aesthetically pleasing feel and appearance.
1. A composite foam cushion for a sound control device to be placed against the head or ear of a user, the composite foam cushion comprising:
a core formed of a polymeric foam material and a gel incorporated into the polymeric foam material; and
a polymeric coating disposed on at least a portion of the core, the polymeric coating including:
an inner polymeric coating layer; and
an outer polymeric coating layer disposed over at least a portion of the inner polymeric coating layer.
2. The composite foam cushion of claim 1 , wherein the outer polymeric coating layer is formed of a polymeric composition including a crosslinker.
3. The composite foam cushion of claim 2 , wherein the inner polymeric coating layer is formed of a polymeric composition including a crosslinker.
4. The composite foam cushion of claim 3 , wherein the crosslinker of the polymeric composition of the outer polymeric coating layer is present in a greater weight percent than the crosslinker of the polymeric composition of the inner polymeric coating layer.
5. The composite foam cushion of claim 3 , wherein the crosslinker of the polymeric composition of the outer polymeric coating layer is different than the crosslinker of the polymeric composition of the inner polymeric coating layer.
6. The composite foam cushion of claim 3 , wherein the polymeric composition of the inner polymeric coating layer and the polymeric composition of the outer polymeric coating layer are both polyurethane based polymers.
7. The composite foam cushion of claim 1 , wherein the inner polymeric coating layer is bonded to the polymeric foam material of the core at an interface between the inner polymeric coating layer and the core.
8. The composite foam cushion of claim 7 , wherein the outer polymeric coating layer is bonded to the inner polymeric coating layer at an interface between the outer polymeric coating layer and the inner polymeric coating layer.
9. The composite foam cushion of claim 1 , wherein the inner polymeric coating layer is formed of a polyurethane based polymer and the outer polymeric coating layer is formed of a polyurethane based polymer.
10. The composite foam cushion of claim 1 , wherein the outer polymeric coating layer includes a visually identifiable textured surface to provide preferential creasing when the cushion is deformed.
11. A composite foam cushion for a sound control device, comprising:
a core formed of a polymeric foam material and a gel incorporated into the polymeric foam material, the polymeric foam material having a first glass transition temperature of less than 0° C.; and
a polymeric coating bonded to at least a portion of the core, the polymeric coating including:
an inner polymeric coating layer overlaying at least a portion of the core of polymeric foam material; and
an outer polymeric coating layer overlaying at least a portion of the inner polymeric coating layer, the outer polymeric coating layer formed of a polymeric composition including a crosslinker.
12. The composite foam cushion of claim 11 , wherein the polymeric foam material has a second glass transition temperature of about −25° or less.
13. The composite foam cushion of claim 11 , wherein the inner polymeric coating layer is chemically bonded to the polymeric foam material of the core at an interface between the inner polymeric coating layer and the core.
14. The composite foam cushion of claim 13 , wherein the outer polymeric coating layer is chemically bonded to the inner polymeric coating layer at an interface between the outer polymeric coating layer and the inner polymeric coating layer.
15. The composite foam cushion of claim 11 , wherein the polymeric foam material is a viscoelastic polymeric foam material.
16. A sound control device, comprising:
a pair of ear pieces with a band extending between the ear pieces, each ear piece including a cushion configured to be placed over the outer ear of a user, each cushion including:
a polymeric foam core formed of a polymeric foam material and a gel incorporated into the polymeric foam material;
an inner polymeric coating layer bonded to the polymeric foam core; and
an outer polymeric coating layer bonded to the inner polymeric coating layer.
17. The sound control device of claim 16 , wherein the inner polymeric coating layer is chemically bonded to the polymeric foam material of the core at an interface between the inner polymeric coating layer and the core, and the outer polymeric coating layer is chemically bonded to the inner polymeric coating layer at an interface between the outer polymeric coating layer and the inner polymeric coating layer.
18. The sound control device of claim 16 , wherein the outer polymeric coating layer is formed of a polymeric composition including a crosslinker.
19. The sound control device of claim 18 , wherein the inner polymeric coating layer is formed of a polymeric composition including a crosslinker.
20. The sound control device of claim 19 , wherein the crosslinker of the polymeric composition of the outer polymeric coating layer is present in a greater weight percent than the crosslinker of the polymeric composition of the inner polymeric coating layer.