Patent GB-972029-A (GB)
Title: A process for the production of shaped elements,foils,coating and fibres
IPC: C08K5/00
Filed: 1962-08-15
Abstract: Highly-elastic polyurethanes are produced by a process which comprises reacting together at least one relatively high molecular weight polyhydroxyl compound, at least one polyisocyanate and at least one chain extender containing at least two reactive hydrogen atoms to form a substantially linear reaction product containing no free NCO-groups, mixing a solution of the reaction product with 0.01 to 9% by weight (calculated on the solid content of the solution) of one or more compounds which contain at least two ethylene imide groups bonded to carbonyl, thiocarbonyl, -CO-NH-, -CS-NH-, -CO-O-, -CS-O-, -SO2-, -1C=N-, carbonic acid or phosphoric acid radicals, removing the solvent while shaping and, during or after the shaping, heating to 80 to 170 DEG C. In a modification, the chain extender is reacted in solution with an isocyanate terminated prepolymer in the presence of the poly(ethylene imide). The relatively high molecular weight polyhydroxyl compound may be a polyester, polyesteramide, polyether or polyacetal, for the preparation of which, starting materials are listed as are many organic polyisocyanates and chain extenders, the latter being glycols, diamines, hydrazines, hydrazides, bis-semicarbazides, water, dicarboxylic acids or bis mercaptans. The polyethylene imides may be reaction products of ethylene imine, or alkyl or aryl C-substituted ethylene imines, with organic polyisocyanates or polyisothiocyanates; carbonylbis-ethylene imide; phosphoric acid tris-ethylene imide; phosphoric acid mono-ester bis ethylene imides; the reaction product of cyanuric acid chloride and ethylene imine; the ethylene imides of polycarboxylic or polysulphonic acids and poly-N,N-ethylene urethanes or thiourethanes. Solvents which may be used include dimethylformamide, dimethylacetamide, diethylformamide, dimethylpropionamide, dimethyl sulphoxide, N-methylpyrrolidone and hexamethylphosphoramide, and, possibly, together with minor amounts of dioxan, tetrahydrofuran, glycol monomethyl ether acetate, di-n-butyl ether, cyclohexanone, benzene and chlorobenzene. The poluyrethane may be pigmented with titanium dioxide before reaction with the poly(ethylene imide). The products may be shaped elements, foils, coatings or fibres. Specifications 823,352 and 840,097 are referred to.ALSO:Highly elastic coatings on woven fabrics are produced by a process which comprises reacting together at least one relatively high molecular weight polyhydroxyl compound, at least one polyisocyanate and at least one chain extender containing at least two reactive hydrogen atoms to form a substantially linear reaction product containing no free NCO-groups, mixing a solution of the reaction product with 0,01-9% by weight (calculated on the solid content of the solution) of one or more compounds which contain at least two ethylene imide groups bonded to carbonyl, thiocarbonyl, -CO-NH-, -CS-NH-, -CO-O-, -CS-O-, -SO2-, <FORM:0972029/B1-B2/1> , carbonic acid or phosphoric acid radicals, removing the solvent while shaping, and during or after the shaping, heating to 80-170  DEG C.  In a modification, the chain extender is reacted in solution with an isocyanate terminated pre-polymer in the presence of the poly(ethylene imide). Specifications 823,352 and 840,097 are referred to.