POLYETHERS CONTAINING TERMINAL AMINO GROUPS

1303787 Amino-terminated polyethers; polyurethanes BAYER AG 22 April 1971 [22 April 1970] 10724/71 Heading C3R Novel compounds of the formula wherein n denotes an integer of from 2 to 8, X denotes O or S, and R denotes an n-valent radical obtained by the removal of hydroxyl or mercapto groups from an n-valent polyalkylene ether polyol or a polyalkylene thioether polythiol, are prepared by reacting compounds of the formula (HX) n R having a molecular weight of from 600 to 10,000 with at least n equivalents of isatoic acid anhydride in the presence of a strong base. The products may be converted to polyurethane resins by reaction with polyisocyanates and optional chain-extending agents. Specified polythiol or polyol reactants include polytetrahydrofuran, polypropylene glycol, polypropylene oxides capped with ethylene oxide units, bifunctional polyethers obtained by successive propoxylation and ethoxylation of aniline or beta, beta1-dihydroxy-N-ethyl-diethylamine, ethoxylated trimethylol propane, propoxylated beta, beta1-dihydroxy-N-stearoyldiethylamine, a polyether glycol of M.W. 1400 having 30% hexane diol and 70% thiodiglycol units, and tri- and tetra-functional polyethers obtained by successive propoxylation and ethoxylation of glycerol and ethylene diamine, respectively. Polyurethane resins are obtained from the novel amino-terminated esters of these compounds by reaction with tolylene diisocyanate and subsequent chain extension with 1,4- dichloro-3,5-diaminobenzene. Foamed polyurethanes are prepared by reaction with tolylene diisocyanate, 4,41 - diisocyanato - diphenylmethane partly converted to a carbodiimide derivative and an isocyanate-terminated prepolymer derived from tolylene diisocyanate and a polyether based on dipropylene glycol and propylene oxide having an OH-number of 148, other ingredients present being silicone stabilizers, water and monofluorotrichloromethane foaming agents, isobutyl 4-chloro-3,5-diaminobenzoate chain extending agent, and stannous 2 - ethylhexoate, N - methyl - N1 - (N,N - dimethylaminoethyl)-piperazine and a combination of 2,2,4 - trimethyl - 2 - sila - morpholine, N - methyl - N1 - (N,N - dimethylaminoethyl)- piperazine and beta, beta1-dihydroxy-diethylamine as catalysts. Uses.-Improved polyurethanes.