Cross-linkable thermoplastic polyurethanes
AssigneeHuntsman International LLC
InventorsChris Ian Lindsay, Christina Marinus, Hans Godelieve Guido Verbeke, Rene Alexander Klein
Life of this patent
Estimating the term…
Abstract
The invention provides a cross-linkable mixture of thermoplastic polyurethanes and ethylenic unsaturated compounds and thermoset materials that can obtained therefrom. The invention also provides application of the cross-linkable mixtures and processes in a solvent-less coating process.
Claims13
A cross-linkable mixture comprising ethylenically unsaturated compounds and a thermoplastic polyurethane with a number average molecular weight of 5000 to 10000, and wherein the thermoplastic polyurethane contains radically polymerizable unsaturated groups at ends of the thermoplastic polyurethane;
- wherein the thermoplastic polyurethane is urea-free, isocyanurate-free, oxazolinyl-free and functional radically-polymerizable pendant group free and is obtained by reacting one or more polyfunctional isocyanates, one or more polyfunctional polyols, one or more monofunctional alcohols or amines comprising radically-polymerizable unsaturation(s) and one or more diol chain extenders;
- and wherein the mixture does not contain any additional non-reactive solvent;
- wherein the amount of alcohol or amine comprising radically polymerizable unsaturations is between 0.08 mmole and 0.35 mmole per gram of cross-linkable mixture;
- and wherein the amount of thermoplastic polyurethane is between 45 and 70% by weight and the amount of ethylenically unsaturated compound is between 30 and 55% by weight, based on the total cross-linkable mixture;
- and further wherein the thermoplastic polyurethane is obtained in the absence of a triol having a molecular weight less than 400.
A method of preparing a cross-linkable mixture, comprising:
- a. providing at least one polyfunctional isocyanate;
- b. providing at least one polyfunctional polyol;
- c. providing at least one low molecular weight diol;
- d. providing at least one radically polymerizable unsaturated alcohol or amine;
- e. providing at least one ethylenically unsaturated compound;
- f. blending the compounds provided in steps a to e and reacting the compounds provided in steps a to d, wherein blending and reacting the compounds results in a thermoplastic polyurethane with a number average molecular weight of 5,000 to 10,000;
- wherein the method is carried out in the absence of any additional non-reactive solvent;
- wherein the amount of alcohol or amine comprising radically polymerizable unsaturations is between 0.08 mmole and 0.35 mmole per gram of cross-linkable mixture;
- and wherein the amount of thermoplastic polyurethane is between 45 and 70% by weight and the amount of ethylenically unsaturated compound is between 30 and 55% by weight, based on the total cross-linkable mixture;
- and further wherein the method is carried out in the absence of a triol having a molecular weight less than 400.
Dependencies are inferred from the claim text.