Claims
- 1. A polyurethane foam composition comprising:
- 100 parts by weight of a hydrogenated polydiene diol having a number average molecular weight from 1,000 to 20,000;
- an aromatic polyisocyanate;
- from 20 to 200 parts by weight oil; and
- a blowing agent.
- 2. A composition according to claim 1, wherein the polydiene diol has a functionality of from 1.6 to 2 hydroxyl groups per molecule, and wherein the polyisocyanate has a functionality of from 1.8 to 3.0 isocyanate groups per molecule.
- 3. A composition according to claim 2 wherein the polyisocyanate is at a concentration which gives an equal number of isocyanate groups and hydroxyl groups.
- 4. A composition according to claim 2 wherein the polyisocyanate has a functionality of from 2.5 to 3.0 isocyanate groups per molecule.
- 5. A composition according to claim 4 wherein the blowing agent is water and wherein the concentration of water is between about 0.5 parts by weight and about 3.5 parts by weight per hundred parts diol.
- 6. A composition according to claim 2, wherein the polydiene diol is a polybutadiene diol.
- 7. A composition according to claim 2, wherein the polydiene diol has a number average molecular weight of 3,000 to 6,000.
- 8. A composition according to claim 7 wherein the polydiene diol has a functionality of from 1.8 to 2 hydroxyl groups per molecule.
- 9. A composition according to claim 8, wherein the polydiene diol is a polybutadiene diol.
- 10. A composition according to claim 2, wherein the aromatic polyisocyanate has a functionality of 2.7.
- 11. A polyurethane foam produced by a process comprising the steps of:
- combining 100 parts by weight of a hydrogenated polydiene diol having a number average molecular weight from 1,000 to 20,000 and a functionality of from 1.6 to 2 hydroxyl groups per molecule with an aromatic polyisocyanate having a functionality of from 2.5 to 3.0 isocyanate groups per molecule and from 20 to 200 parts by weight oil; and
- foaming the combined polydiene diol, aromatic polyisocyanate and oil to form a resilient polyurethane foam.
- 12. A polyurethane foam according to claim 11, wherein foaming agents are combined with the polydiene diol and oil prior to combination of the aromatic polyisocyanate.
- 13. A polyurethane foam according to claim 12, wherein the foaming agents comprise water, an amine catalyst, a delayed action amine catalyst, and a silicon surfactant.
- 14. A polyurethane foam produced by a process comprising the steps of:
- mixing 100 parts by weight of a hydrogenated polydiene diol having a number average molecular weight from 1,000 to 10,000 and a functionality of from 1.8 to 2.0 hydroxyl groups per molecule with from 20 to 200 parts by weight oil, from 1 to 2 parts by weight of water, from 0.4 to 0.8 parts by weight of an amine catalyst, from 0.3 to 0.5 parts by weight of a delayed action amine catalyst, and from 0.02 to 0.04 parts by weight of a silicon surfactant; and
- adding a polymeric isocyanate, wherein the polymeric isocyanate has a functionality of from 2.5 to 3.0 isocyanate groups per molecule and is added at a concentration which gives an equal number of isocyanate groups and hydroxyl groups.
- 15. A polyurethane foam according to claim 14, wherein the polydiene diol has from 40% to 60% 1,2-addition of butadiene.
- 16. A polyurethane foam according to claim 15, wherein the polymeric polyisocyanate has a functionality of 2.7.
Parent Case Info
This application claims the benefit of U.S. Provisional Application Ser. No. 60/047,521, filed May 23, 1997, the entire disclosure of which is hereby incorporated by reference.
US Referenced Citations (4)