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US 4,055,549 AGranted
Thermoplastically processable polyurethanes based on tolylene diisocyanate
AssigneeUnion Carbide Corporation
InventorRene Roberts
Life of this patent
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Abstract
Thermoplastically processable polyurethanes are produced by the reaction of tolylene diisocyanate, at least one polycaprolactone diol, a low molecular weight diol chain extender and water.
Claims16
A method for producing a thermoplastically processable polyurethane, which comprises simultaneously reacting
- a. a polycaprolactone diol having a molecular weight of from 1,000 to 4,000;
- b. a low molecular weight diol chain extender;
- c. tolylene diisocyanate;
- and
- d. water,
- the mole ratio of a:b:c:d employed in the reaction being 1:3-6:8-14:2-7 and the ratio of c:d employed in the reaction being from 2:1 to 4:1.
3 more elements
A method of producing a thermoplastically processable polyurethane, which comprises the steps of:
- a. prereacting (i) tolylene diisocyanate and (ii) water to form N,N'-di(isocyanatotolylene)urea;
- then
- b. reacting the N,N'-di(isocyanatotolylene)urea thus formed with (iii) a polycaprolactone diol having a molecular weight of from 1,000 to 4,000 and (iv) a low molecular weight diol chain extender, the overall mole ratio of i:ii:iii:iv employed in steps (a) and (b) being 8-14:2-7:1:3-6 and the mole ratio of i:ii employed in step (a) being from 2:1 to 4:1.
Dependencies are inferred from the claim text.