Cellular urethanes

Abstract

Abstract The invention comprises a phosphorus-containing polyether obtainable by reacting an epihalohydrin and a polyol component which comprises a sugar alcohol containing 5 or 6 carbons, a triol and orthophosphoric acid as described below. The reaction is suitably effected in the presence of an acidic fluorine-containing compound as catalyst, e.g. fluoboric acid. The term orthophosphoric acid includes strong phosphoric acid which contains in addition to orthophosphoric acid, pyrophosphoric acid and possibly higher polyphosphoric acids. In an example a mixture of glycerine, sorbitol and phosphoric acid is heated to 85 DEG C., fluoboric acid is added as catalyst and the temperature maintained between 86 DEG C. and 92 DEG C. during the addition of epichlorhydrin, and the mixture allowed to stand for 2 hours after the addition. The reaction mass is neutralized with triethanolamine. The epihalohydrin is preferably epichlorhydrin and the ratio of the number of moles of epihalohydric to the number of hydroxyl groups in the polyol component is preferably 0.5: 1 to 6: 1. The polyol component is preferably a mixture of from 80 to 30 equivalent weight per cent of the sugar alcohol, preferably sorbitol, and 20 to 70 equivalent weight per cent of the triol, preferably glycerine, and orthophosphoric acid taken together, and the amount of orthophosphoric acid is preferably such that the polyether contains 0.3 to 2.5% by wt. of combined phosphorus.

Inventors

• 👤 Robert A Wiles
• 👤 Edward R Degginger

Bibliographic Details