Preparation of poly(ether-urethanes) from cyclic ethers and organic isocyanates
AssigneeE. I. Du Pont de Nemours and Company
InventorNeville E. Drysdale
Life of this patent
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Abstract
Poly(ether-urethanes) can be made from cyclic ethers and organic isocyanates by using selected metal compounds as catalysts. Polymers useful as thermoplastic elastomers, spandex fibers or urethane rubbers can be made by reacting diisocyanates containing functional groups with a tetrahydrofuran, especially tetrahydrofuran itself.
Claims20
A process for the production of poly(ether-urethanes), comprising, contacting a cyclic ether which is an oxirane, oxetane, tetrahydrofuran, 1,3-dioxolane, 1,3, 5-trioxane, or oxepane, an organic isocyanate of the formula A(NCO).sub.x and a catalyst of the formula MZ.sub.s.Q.sub.t, wherein:
- M is a metal selected from the group consisting of cobalt, tungsten, vanadium, niobium, strontium, barium, scandium, yttrium, the rare earth metals, titanium, zirconium, hafnium, chromium, molybdenum, tantalum, rhenium, iron, ruthenium, osmium, rhodium, iridium, palladium, platinum, silver, gold, zinc, cadmium, mercury, aluminum, gallium, indium, thulium, germanium, tin, lead, arsenic, antimony and bismuth;
- at least one of Z is an anion of the formula --OSO.sub.2 R.sup.5, wherein R.sup.5 is perfluoroalkyl containing 1 to 12 carbon atoms or part of a fluorinated group wherein the carbon atoms alpha and beta to the sulfonate group are together bonded to at least four fluorine atoms, or tetrafluoroborate, and the remainder of Z is oxo or one or more monovalent anions;
- s is 1 when m is silver;
- s is 2 when M is strontium, barium, cobalt, rhodium, iridium, palladium, chromium, zinc, cadmium or mercury;
- s is 3 when M is scandium, yttrium, a rare earth metal, arsenic, antimony, bismuth, gold, iron, ruthenium, osmium, aluminum, gallium, indium or thulium;
- s is 4 when M is titanium, zirconium, hafnium, molybdenum, germanium, tin or lead;
- s is 5 when M is rhenium, vanadium, niobium or tantalum;
- s is 6 when M is tungsten;
- Q is a neutral ligand;
- t is 0 or an integer of 1 to 6;
- each A is independently an organic radical having x free valencies;
- each x is independently 1, 2, 3, 4, 5 or 6;
- and
- provided that:
- A is bound to isocyanate groups through a carbon atom;
- and
- each oxo present as part of Z is considered to account for two of s.
Dependencies are inferred from the claim text.