| 摘要 |
<p>1411485 Polyurethane-ureas WITCO CHEMICAL CORP 13 Aug 1973 [14 Aug 1972] 38301/73 Headings C3R and C3B A curable composition comprises an amineterminated polyetherurethane-urea and an epoxide in one or more organic solvents. The amine-terminated polyetherurethane urea is preferably prepared by reacting a difunctional polyalkylene ether glycol and a diisocyanate and chain extending the resulting prepolymer with an excess of diamine preferably in admixture with a monoamine. Preferred glycols are poly-(oxytetramethylene)-glycol, poly-(oxyethylene)-glycol and poly-(oxypropylene)-glycol; preferred diisocyanates are hexamethylene diisocyanate, toluene diisocyanate, methylene bis- (cyclohexyl isocyanate) and diphenylmethane- 4,4<SP>1</SP>-diisocyanate. The preferred diamines are cyclo-aliphatic particularly 1,8-diamino-p-menthane, hexahydropyrazine and 3-aminomethyl- 3,5,5-trimethylcyclohexylamine. The preferred monoamines are alkylamines and alkanolamines. The preferred epoxides are a diglycidyl ether of p,p<SP>1</SP>-isopropylidenediphenol or of the corresponding sulphone, a triglycidyl ether of glycerol, 1,2,3-tris-(2,3-epoxypropoxy)-propane and a triglycidyl ether of a phenol-formaldehyde resin. The organic solvent is preferabyl one or more of toluene, methyl ethyl ketone and dimethylformamide and preferably comprises at least 5% wt. of a C 1-5 monohydric alcohol particularly isopropanol. The epoxide is added to a solution of the amine terminated polyetherurethane urea and upon evaporation of the solvent a cured polymer results. Uses.-Coatings; films; adhesives.</p> |
