Polyurethane foam
AssigneeLevitex Foams Limited
InventorJianfeng Wang
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Abstract
A polyurethane foam is disclosed having unique load bearing characteristics rendering it suitable for a variety of applications. The foam exhibits high surface-softness and smoothness properties, making it well-suited for use in articles such as pillows and mattress toppers. However, upon continued application of pressure, the resilience of the foam increases sharply, translating into a remarkable support characteristics that make the foam suitable for use in the seat portions of chairs and sofas, as well as in the base portion of mattresses. The foams therefore address the limitations of conventional, high-resilience and visco-elastic polyurethane foams. A process of making the foam and its use in various articles is also disclosed.
Claims19
A polyurethane foam having a sag value of 3.2-3.4, wherein the sag value is calculated according to the following expression:
- Sag
-
- Value
- =
- IFD
-
- 65
-
- %
- IFD
-
- 25
-
- %
- wherein the polyurethane foam has:
- an IFD25% value of 20-24 N,
- an IFD40% value of 33-37 N,
- an IFD65% value of 70-74 N,
- and wherein the IFD25%, IFD40%, and IFD65% values are determined according to the protocol set forth in ISO 2439:2008.
A polyurethane foam having a sag value of 3.3-3.4, wherein the sag value is calculated according to the following expression:
- Sag
-
- value
- =
- IFD
-
- 65
-
- %
- IFD
-
- 25
-
- %
- wherein the polyurethane foam has:
- an IFD25% value of 22-25 N,
- an IFD40% value of 39-42 N,
- an IFD65% value of 78-81 N,
- and wherein the IFD25%, IFD40%, and IFD65% values are determined according to the protocol set forth in ISO 2439:2008.
Dependencies are inferred from the claim text.