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AssigneeDow Global Technologies LLC
InventorsKshitish A. Patankar, Arjun Raghuraman, Thomas P. Willumstad, Mark F. Sonnenschein, Jody Henning, Heather A. Spinney, David R. Wilson, Sukrit Mukhopadhyay, William H. Heath
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Polyurethanes are made in a one-shot process from one or more polyols having a hydroxyl equivalent weight of at least 350, wherein at least 50% of the weight of iii) is a hydroxyl-containing polymer of propylene oxide, the hydroxyl-containing polymer of propylene oxide having a hydroxyl equivalent weight of at least 350, an average of 1.8 to 3 hydroxyl groups per molecule of which hydroxyl groups 40 to 70% are primary hydroxyl groups, an oxyethylene content of no greater than 10% by weight based on the weight of the polymer and a polydispersity of 1.175 or less. The polyurethanes exhibit excellent mechanical properties, are highly hygroscopic and cured rapidly.
A polyurethane which is the reaction product of a reaction mixture including i) one or more polyisocyanates, ii) one or more chain extenders and/or crosslinkers and iii) one or more polyols having a hydroxyl equivalent weight of at least 350, wherein at least 50% of the weight of iii) is a hydroxyl-containing homopolymer of propylene oxide, the hydroxyl-containing homopolymer of propylene oxide having a hydroxyl equivalent weight of at least 350, an average of 1.8 to 3 hydroxyl groups per molecule of which hydroxyl groups 40 to 65% are primary hydroxyl groups, and a polydispersity of 1.00 to 1.08.
A one-shot method for making a polyurethane, comprising forming a reaction mixture comprising i) one or more polyisocyanates, wherein the one or more polyisocyanates has a number average isocyanate equivalent weight of no greater than 200, and isocyanate-reactive materials that include ii) at least one chain extender and/or at least one crosslinker and iii) one or more polyols having a hydroxyl equivalent weight of at least 350, wherein at least 50% of the weight of iii) is a hydroxyl-containing homopolymer of propylene oxide, the homopolymer of propylene oxide having a hydroxyl equivalent weight of at least 350, an average of 1.8 to 3 hydroxyl groups per molecule of which hydroxyl groups 40% to 65% are primary hydroxyl groups and a polydispersity of 1.00 to 1.08, and curing the reaction mixture in one step and in the presence of no more than 5%, based on the weight of the reaction mixture, of a solvent, to form the polyurethane, wherein the one or more polyisocyanates and the at least one chain extender and/or at least one crosslinker together constitute 15 to 60% of the total combined weight of the one or more polyisocyanates and isocyanate-reactive materials.
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