Polyurethane foam formulation, products and methods
A foam article for use in a seat cushion includes an open cell, polyurethane foam material that includes a base polyol; a crosslinker; an isocyanate; a surfactant; and water, that are reacted together to produce a seat cushion having dynamic and static performance specifications that are better than the performance characteristics for a traditional, high resilient material seat cushion, as well as other seating materials.
1. An open cell, foam article made from an open cell, foam material, for use in a seat application, the foam material produced from a reaction mixture comprising:
a base polyol having a molecular weight of greater than 3000;
an isocyanate;
a surfactant; and
water; and
wherein the open cell, foam material is a crushed open cell, molded foam material having a natural frequency between about 2.6 hertz and about 4.6 hertz and a transmissivity of about 1.01 to about 3.5 at the natural frequency for a 25 mm-150 mm thick cushion.
2. The open cell, foam article of claim 1 , wherein the polyol has a molecular weight of from 5000 to 10000.
3. The open cell, foam article of claim 1 , wherein the polyol has a molecular weight of from 6000 to 8000.
4. The open cell, foam article of claim 1 , wherein the polyol and the isocyanate have an index of from 90 to 98.
5. The open cell, foam article of claim 1 , wherein the surfactant concentration is from 0.2 pph to 0.7 pph.
6. The open cell, foam article of claim 1 , wherein the article is a seat base cushion, a seat back cushion, a lumbar cushion, or a bolster cushion.
7. An open cell, polyurethane foam material comprising the reaction product of:
a base polyol having a molecular weight of from 6000 to 8000;
an isocyanate;
a surfactant; and
water;
wherein the open cell, polyurethane foam material is a crushed open cell, molded foam material having a natural frequency between about 2.3 hertz and about 4.3 hertz and a transmissivity of about 1.01 to about 3.5 at the natural frequency for a 25 mm-150 mm thick cushion.
8. An open cell, polyurethane foam material comprising the reaction product of:
an ethylene oxide (EO) capped base polyol having a molecular weight greater than 3000;
an isocyanate;
a surfactant; and
water; and
wherein the open cell, polyurethane foam material is a crushed open cell, molded polyurethane foam material having a natural frequency of less than 4.6 Hertz and a transmissivity of 3.6 or less for a 50 mm-100 mm thick cushion, and a comfort value of below 13.0, wherein the comfort value is determined by multiplying a peak measured transmissivity by the natural frequency.