GB981687A - Polyethers and derivatives thereof - Google Patents

Abstract

Urea-alkylene oxide adducts are prepared by reacting an alkylene oxide with a urea derivative of a metal of Group Ia, preferably mono-sodio-or potassio-urea, urea also optionally being present. The preferred alkylene oxides contain not more than 4 C atoms, e.g. ethylene, propylene, or butene-1 oxides. The reaction proceeds between 0 DEG and 200 DEG C., preferably at 70-110 DEG C. After reaction the metal is removed by neutralization with an acid, e.g. acetic or phosphoric acids, or disodium dihydrogen pyrophosphate, or an acid clay. In examples the reactions of propylene oxide with urea and monosodiourea-(1), monosodiourea-(2) and (3), and with sodium and urea-(4) are described.ALSO:Urea-alkylene oxide adducts are prepared by reacting an alkylene oxide with a urea derivative of a metal of Group Ia, preferably sodium or potassium, urea also optionally being present. The preferred alkylene oxides contain not more than 4 C atoms, e.g. ethylene, propylene or butene-1 oxides. The reaction proceeds between 0 DEG and 200 DEG C., preferably at 70-110 DEG C. After reaction the metal is removed by treatment with an acid, e.g. acetic or phosphoric acids, or disodium dihydrogen pyrophosphate, or an acid clay. The adducts may be treated with organic polyisocyanates or polyisothiocyanates to form polyurethanes. Tolylene diisocyanate and the "one shot process" for foams are preferred. The isocyanate is preferred to be in 5-10% excess, and the catalyst to be triethylene diamine. The materials are particularly suitable for flexible and semi-rigid polyurethane foams. In the examples the reactions of propylene oxide with urea and monosodiourea (1), monosodiourea (2) and (3), and with sodium and urea (4), are described. Example 5 gives details of the preparation of a polyurethane foam from the product of Example (2), tolylene diisocyanate, water and a silicone oil in the presence of triethylene diamine and stannous octoate.