Polymer-modified polyols
AssigneeImperial Chemical Industries PLC
InventorsWilliam G. Carroll, Peter Farley
Life of this patent
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Abstract
A high-strength polymer-modified polyol comprises a polyol and from 40 to 80% by weight of the reaction product of a polyisocyanate and a tertiary-N-polyolamine based on the combined weight of the polyol and reaction product. Also included are methods of forming the polymer-modified polyol; a polymer-modified polyol obtained by dilution of the high strength polymer-modified polyol; the use of the polymer-modified polyols in the manufacture of polyurethane products and the polyurethane products so obtained. The polymer-modified polyols are particularly useful for preparing highly resilient flexible foams.
Claims10
A polymer-modified polyol obtained by reacting a polyisocyanate with a tertiary-N-polyolamine in the presence of a first polyol in amounts such that the weight of the reaction product of the polyisocyanate and polyolamine is from 40 to 80% of the combined weight of the reaction product and first polyol and subsequently diluting the reaction product with a second polyol, which is the same as or different to the first polyol, to less than 40% by weight of the reaction product on the combined weight of the reaction product and polyols.
A method of forming a polymer-modified polyol which comprises the step of
- (a) reacting a polyisocyanate with a tertiary-N-polyolamine in the presence of a first polyol in amounts such that the weight of the reaction product of the polyisocyanate and polyolamine is from 40 to 80% of the combined weight of the reaction product and first polyol, and
- (b) subsequently diluting the reaction product obtained in step (a) with a second polyol, which is the same or different to the first polyol, to less than 40% by weight of the reaction product on the combined weight of the reaction product and polyols.
A method of forming a polymer-modified polyol which comprises the steps of
- (a) reacting a polyisocyanate with a tertiary-N-polyolamine in the presence of a polyol;
- (b) adding more of the same or a different polyisocyanate;
- and
- (c) optionally adding before or after step (b) more of the same or a different polyol to reduce the concentration of the reaction product so formed;
- the total amount of polyisocyanate used being such that the ratio of isocyanate groups to hydroxyl groups supplied by the polyolamine is from 0.33:1 and the combined weight of the total polyisocyanate and polyolamine used being from 40 to 80% of the combined weight of the polyisocyanate, polyolamine and the polyol discounting the polyol optionally added in step (c).
Dependencies are inferred from the claim text.