Silicone-impregnated foam product and method for producing same
View Patent ↗The present invention relates to products having a foam carrier or substrate, and particularly to such products employing a reticulated polyurethane foam carrier impregnated with silicone polymer. The present invention also relates to a method of producing these silicone-impregnated foam products.
1. A resilient composite structure comprising:
a carrier layer of reticulated, open-cell, resilient polyurethane foam material, said resilient polyurethane foam material being substantially completely and uniformly impregnated with an impregnant comprising a curable silicone polymer; the impregnant being cured into a substantially elastomeric solid after said impregnation to produce a highly-durable, foamed, open-cell resilient composite structure wherein the impregnant partially coats the cell walls of the open cells of said carrier layer of resilient polyurethane foam material;
wherein said impregnant, prior to curing, has a viscosity in the range of about 5,000 cP/mPa's to about 120,000 cP/mPa's; and
wherein said structure, after said silicone polymer is cured, is of a thickness that is less than an initial thickness of said carrier layer.
2. The resilient composite structure as defined in claim 1 wherein said carrier layer has a thickness in the range of about 80 to 650 mils.
3. The resilient composite structure as defined in claim 1 wherein said carrier layer has an initial density of less than about 1.5 pounds per cubic foot.
4. The resilient composite structure as defined in claim 1 wherein said impregnant, prior to curing, has a viscosity in the range of about 8,000 cP/mPa's to about 80,000 cP/mPa's.
5. The resilient composite structure as defined in claim 4 wherein said impregnant, prior to curing, has a viscosity in the range of about 10,000 cP/mPa's to about 12,000 cP/mPa's.
6. The resilient composite structure as defined in claim 1 further comprising a substrate securely adhered to said impregnated foam material, said substrate extending completely across at least one surface thereof.
7. The resilient composite structure as defined in claim 6 wherein said substrate is adhered to said impregnated foam material by an adhesive, said adhesive being a component independent of said impregnant.
8. The resilient composite structure as defined in claim 1 wherein said structure has a thickness in a range between about 2 mm and about 6 inches.
9. The resilient composite structure as defined in claim 1 wherein the impregnant further comprises a cross-linking agent.
10. The resilient composite structure as defined in claim 9 wherein the cross-linking agent comprises peroxide.
11. The resilient composite structure as defined in claim 9 wherein the cross-linking agent comprises tin.
12. The resilient composite structure as defined in claim 1 wherein the impregnant comprises a flame retardant.
13. The resilient composite structure as defined in claim 12 wherein the flame retardant comprises alumina trihydrate.
14. The resilient composite structure as defined in claim 1 wherein the impregnant is adapted to be cured at room temperature.
15. The resilient composite structure as defined in claim 1 wherein the impregnant comprises a room temperature vulcanizable silicone polymer.
16. The resilient composite structure as defined in claim 1 wherein the impregnant is adapted to be cured by a heater.
17. The resilient composite structure as defined in claim 1 wherein the impregnant comprises a heat curable silicone polymer.
18. The resilient composite structure as defined in claim 1 wherein the impregnant substantially completely coats the cell walls of the open cells of the resilient polyurethane foam material.
19. A method for producing a resilient composite structure comprising:
applying, onto a carrier layer of reticulated, open-cell, resilient polyurethane form material, a silicone polymer substantially completely and uniformly impregnating said carrier layer with said silicone polymer; and
curing said silicone polymer to produce a foamed, open-cell resilient composite structure wherein the silicone polymer partially coats the cell walls of the open cells of said carrier layer of resilient polyurethane foam material,
wherein the composite structure exhibits properties of the silicone polymer;
wherein said silicone polymer impregnant, prior to curing, has a viscosity in the range of about 5,000 cP/mPa's to about 120,000 cP/mPa's; and
wherein said composite structure, after said silicone polymer is cured, is of a thickness that is less than an initial thickness of said carrier layer.
20. The method as defined in claim 19 wherein said carrier layer has an initial density of less than about 1.5 pounds per cubic foot.
21. The method as defined in claim 19 wherein said impregnant, prior to curing, has a viscosity in the range of about 8,000 cP/mPa's to about 80,000 cP/mPa's.
22. The method as defined in claim 21 wherein said impregnant, prior to curing, has a viscosity in the range of about 10,000 cP/mPa's to about 12000 cP/mPa's.
23. The method as defined in claim 19 further comprising a substrate securely adhered to said impregnated foam material, said substrate extending completely across at least one surface thereof.
24. The method as defined in claim 23 wherein said substrate is adhered to said foam material by an adhesive, said adhesive being a component independent of said impregnant.
25. The method as defined in claim 19 wherein said composite structure has a density in the range of about 3 to about 50 lbs/ft 3 .
26. The method as defined in claim 19 wherein said composite structure has a thickness in the range of 2 mm to 6 inches.