Document Type and Number:
Japanese Patent JPS4843199
Kind Code:
B1
Abstract:
1286389 Linear segmented polyurethanes FARBENFABRIKEN BAYER AG 14 Oct 1970 [17 Oct 1969] 48770/70 Heading C3R [Also in Division C2] Linear segmented polyurethanes contain at least 5 mol. per cent, based on the chain extension segment present, of a chain extension segment of the formula in which R represents a radical of the formula -(CH 2 ) x -, wherein x is 1 or 2 or of the formula wherein y is 0, 1 or 2, and may be prepared by reacting an isocyanate preadduct obtained from a dihydroxy compound with a molecular weight of 500 to 6000, optionally a diol having a M.W. of 62 to 300 and containing optionally one or more tertiary aliphatic amino groups, and a molar excess of a diisocyanate with a substantially equivalent quantity of a bifunctional chain extending agent, at least 5 mol. per cent of which is a monourea hydrazide of the formula wherein R is as above, in the presence of a highly polar organic solvent, and then removing the solvent. The isocyanate preadduct is suitably prepared from a polyester, polycarbonate or polyether and an aromatic diisocyanate. In specific examples, the chain extending agent is urea-N,N1 -diacetic acid hydrazide, urea-N,N1 - dipropionic acid hydrazide, urea -N,N1 -diphenyl- 4,41 -carboxylic acid hydrazide, urea-N,N1 -diphenyl-4,41 -diacetic acid hydrazide or urea- N,N1 - diphenyl - 4,41 - propionic acid hydrazide. Filaments or films may be produced from the polymer solutions.
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Application Number:
JP9057270A
Publication Date:
December 17, 1973
Filing Date:
October 16, 1970
Export Citation:
International Classes:
D01F6/70; C07C275/16; C08G18/00; C08G18/08; C08G18/10; C08G18/12; C08G18/38; C08G18/65; C08L75/04; (IPC1-7): C08G22/04