GB1049287A - New polyethers and polyurethanes - Google Patents

Abstract

Novel polyethers of formula <FORM:1049287/C2/1> wherein R, R1, R11 and R111 each represent H, alkyl or an hydroxyl-ended polyether group, at least two groups being the latter, and wherein the benzene rings may optionally contain alkyl, alkoxy or halogen substituents, are prepared by reacting a diaminodiphenylsulphone in which not more than two of the H atoms have been replaced by alkyl groups with a 1,2-alkylene-oxide. Specified alkylene oxides are propylene, ethylene, butylene and styrene oxides and glycidol. In the example, propylene oxide is condensed with 4:41-diaminodiphenylsulphone.ALSO:Polyethers, suitable for preparing polyurethanes, of formula <FORM:1049287/C3/1> wherein R, R1, R11 and R111 each represent H, alkyl or a hydroxyl-ended polyether group, at least two groups being the latter, and wherein the benzene rings may optionally contain alkyl, alkoxy or halogen substituents, are prepared by reacting a diaminodiphenylsulphone in which not more than two of the H atoms have been replaced by alkyl groups, with a 1,2-alkyleneoxide. Specified alkylene oxides are propylene, ethylene, butylene and styrene oxides and glycidol. Polyurethanes are prepared by reacting the above polyethers with polyisocyanates, preferably in the presence of a cross-linking agent (e.g. water, 4:41-diaminodiphenylsulphone, 4:41 - diamino - 3:31-dichlorodiphenylmethane, ethyleneglycol, mono-and di-ethanolamine and dimethyl-p-nonylphenol. Suitable isocyanates, foaming agents and fillers are specified. In the example, propylene oxide is condensed with 4:41-diaminodiphenylsulphone; the product is mixed with water and butylated urea-formaldehyde resin and phosgenated diaminophenylmethane.ALSO:Polyurethanes, suitable for coating, wood, rubber, metals, glass and fabrics, are prepared from novel hydroxyl-ended polyethers of formula <FORM:1049287/B1-B2/1> wherein R, R1, R11, R111 represent a hydrogen atom, alkyl group or a hydroxyl-ended polyether chain, not more than two being either hydrogen or alkyl groups, the benzene rings may be optionally substituted by alkyl, alkoxy or halogen groups by reaction with polyisocyanates, and preferably cross-linking agents in an inert solvent. The solution obtained is applied by spraying, brushing, dipping, flowing or by roller and preferably left to dry in the air at room temperature but may be heated at temperatures between 40 and 100 DEG C. Other ingredients such as pigments, fillers and flowing out agents such as nitrocellulose may be added before application. The example describes the preparation of a polyurethane from a polyether derived from 4 : 41-diaminodiphenylsulphone and propyleneoxide, butylated urea formaldehyde, and water in cyclohexapone/methyl iso-butyl ketone and diphenylmethanediisocyanate in xylene. One coat of the solution was applied to steel panels by spinning, and to steel rods by dipping, and dried at room temperature.