POLYURETHANES PREPARED WITH TETRAHYDROFURAN-ALKYLENE OXIDE POLYMERIZATES HAVING LOW OLIGOMERIC CYCLIC ETHER CONTENT, PROCESSES FOR PREPARING THE SAME, AND ARTICLES AND FIBERS OF THE POLYURETHANES

摘要

The resistance to degradation on exposure to high temperatures, water and organic liquids of a polyurethane prepared by reacting a tetrahydrofuran/alkylene oxide polymerizate, an organic polyisocyanate and a chain extender is significantly improved by using a tetrahydrofuran/alkylene oxide polymerizate which contains no more than about 3% by weight, of oligomeric cyclic ethers.