Polyurethane foams blown only with water
AssigneeArco Chemical Technology, L.P.
InventorPhilippe C. Motte
Life of this patent
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Abstract
A novel polyurethane resin foam composition is provided which is only water-blown and requires no chlorofluorocarbon or other auxiliary blowing agents, yet suffers little or no degradation in physical properties even at reduced isocyanate indexes. The formulation includes a relatively low molecular weight polyethylene glycol along with the conventional polyol to make a blend for the polyol component. The molecular weight range of the polyethylene glycol is from about 200 to about 600. The lower molecular weight polyethylene glycol may range from about 2 to about 10 parts by weight of the polyol, based on the total polyurethane foam composition.
Claims32
A flexible polyurethane foam composition comprising the reaction product of a polyol blend with a polyisocyanate in the presence of a polyurethane catalyst, and further in the presence of a blowing agent comprising water in the absence of a chlorofluorocarbon (CFC), where the polyol blend comprises a relatively low molecular weight polyethylene glycol and a relatively higher molecular weight polyalkylene oxide triol containing essentially secondary hydroxyl groups.
A flexible polyurethane foam composition comprising the reaction product of a polyol blend with a polyisocyanate in the presence of a polyurethane catalyst, and further in the presence of a blowing agent comprising water in the absence of a chlorofluorocarbon (CFC), where the polyol blend comprises less than 50% of a relatively low molecular weight polyethylene glycol and greater than 50% of a relatively higher molecular weight polyalkylene oxide triol containing essentially secondary hydroxyl groups, and where the low molecular weight polyethylene glycol has a molecular weight range between about 200 and about 600.
A method for producing flexible polyurethane foam compositions comprising the steps of:
- producing a polyol blend by mixing a relatively low molecular weight polyethylene glycol with a relatively higher molecular weight polyalkylene oxide triol containing essentially secondary hydroxyl groups;
- and
- reacting the polyol blend with a polyisocyanate in the presence of a polyurethane catalyst, and further in the presence of a blowing agent comprising water in the absence of a chlorofluorocarbon (CFC).
A method for producing flexible polyurethane foam compositions comprising the steps of:
- producing a polyol blend by mixing a relatively low molecular weight polyethylene glycol with a relatively higher molecular weight polyalkylene oxide triol containing essentially secondary hydroxyl groups, where the polyol blend comprises less than 50% of the relatively low molecular weight polyethylene glycol and greater than 50% of the relatively higher molecular weight oxide triol, and where the low molecular weight polyethylene glycol has a molecular weight range between about 200 and about 600;
- and
- reacting the polyol blend with a polyisocyanate in the presence of a polyurethane catalyst, and further in the presence of a blowing agent comprising water in the absence of a chlorofluorocarbon (CFC).
A soft, halocarbon-free flexible polyurethane foam composition comprising the reaction product of a polyol blend with a polyisocyanate in the presence of a polyurethane catalyst, and further in the presence of a blowing agent comprising water in the absence of a chlorofluorocarbon (CFC),
- where the polyol blend comprises a relatively low molecular weight polyethylene glycol and a relatively higher molecular weight polyalkylene oxide triol containing essentially secondary hydroxyl groups,
- where the composition has an isocyanate index which is less than 100;
- and
- where the resultant halocarbon-free polyurethane foam is softer without adversely affecting the strength and static fatigue properties of the polyurethane foam.
A method for producing a soft, halocarbon-free flexible polyurethane foam composition comprising the steps of:
- producing a polyol blend by mixing a relatively low molecular weight polyethylene glycol and a relatively higher molecular weight polyalkylene oxide triol containing essentially secondary hydroxyl groups;
- and
- reacting the polyol blend with a polyisocyanate in the presence of a polyurethane catalyst, and further in the presence of a blowing agent comprising water in the absence of a chlorofluorocarbon (CFC), where the composition has an isocyanate index which is less than 100;
- and
- where the resultant halocarbon-free polyurethane foam is softer without adversely affecting the strength and static fatigue properties of the polyurethane foam.
Dependencies are inferred from the claim text.