Polydiene diols in resilient polyurethane foams
AssigneeShell Oil Company
InventorHector Hernandez
Life of this patent
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Abstract
Polyurethane foams having high resilience, significantly improved humid aging, excellent tear strength, and light color are formed from a polydiene diol, preferably a hydrogenated polybutadiene diol, having a hydroxyl functionality from 1.6 to 2.0 and from an aromatic polyisocyanate having an isocyanate functionality of from 1.8 to 2.5. The polydiene diol is preferably blended with foaming agents prior to addition of the highly reactive polyisocyanate.
Claims20
A polyurethane foam, produced by a process comprising the steps of:
- combining a polydiene diol having a number average molecular weight from 1,000 to 20,000, wherein between 30% and 70% of the polydiene diol forming monomers add by 1,4-addition, and a functionality of from 1.6 to 2 hydroxyl groups per molecule with an aromatic polyisocyanate having a functionality of from 1.8 to 2.5 isocyanate groups per molecule;
- and
- foaming the combined polydiene diol and aromatic polyisocyanate to form a resilient polyurethane foam.
A polyurethane foam, produced by a process comprising the steps of:
- mixing from 200 to 300 parts by weight of a polydiene diol having a number average molecular weight from 1,000 to 10,000, wherein between 30% and 70% of the polydiene diol forming monomers add by 1,4-addition and a functionality of from 1.8 to 2 hydroxyl groups per molecule with from 2 to 6 parts by weight of water, from 0.5 to 2 parts by weight of an amine catalyst, from 0.5 to 1.5 parts by weight of a tin catalyst, and from 0 to 1 parts by weight of a silicon surfactant;
- and
- adding to the polydiene diol from 90 to 110 index amount of an aromatic polymeric isocyanate having a functionality of from 1.8 to 2.5 isocyanate groups per molecule.
A polyurethane foam, produced by a process comprising the steps of:
- mixing 200 to 300 parts by weight of a hydrogenated polybutadiene diol having a number average molecular weight from 3,000 to 6,000, from 40% to 60% 1,4-addition of butadiene, saturation of at least 90% of the carbon-carbon double bonds, and a functionality of from 1.8 to 2.0 hydroxyl groups per molecule with from 2 to 6 parts by weight of water, from 0.5 to 2 parts by weight of an amine catalyst, from 0.5 to 1.5 parts by weight of a tin catalyst, and from 0 to 1 parts by weight of a silicon surfactant;
- and
- adding to the hydrogenated polybutadiene diol from 90 to 110 index amount of an aromatic polymeric isocyanate having a functionality of from 1.8 to 2.5 isocyanate groups per molecule.
A polyurethane foam comprising:
- a hydrogenated polybutadiene diol having a number average molecular weight from 3,000 to 6,000, from 40% to 60% 1,4-addition of butadiene, saturation of at least 90% of the carbon-carbon double bonds, and a functionality of from 1.8 to 2.0 hydroxyl groups per molecule;
- water;
- an amine catalyst;
- a tin catalyst;
- a silicon surfactant;
- and
- an aromatic polymeric isocyanate having a functionality of from 1.8 to 2.5 isocyanate groups per molecule.
Dependencies are inferred from the claim text.