GB1409817A - Dyeable polyurethane elastomer and its production - Google Patents

Abstract

1409817 Dyeable segmented polyurethane elastomers TOYO BOSEKI KK 24 Nov 1972 [25 Nov 1971 10 March 1972] 54343/72 Heading C3A A dyeable segmented polyurethane elastomer contains the copolymerized residues of:-(i) an isocyanate - terminated polyurethane containing residues of (a) an organic polyisocyanate and (b) a polyol of M.W. 500 to 6000 and M.P. not above 60‹ C.; (ii) an isocyanate-terminated polyurethane containing residues of (a) as in (i), (c) a diol containing tertiary nitrogen and (b) at least 7 mol. per cent based on (c) of (b) as in (i); and (iii) a monomeric polyfunctional compound selected from diamines, hydrazine, dihydrazides, glycol and water. Residues (ii) are preferably present in proportions providing 10 to 150 mmole/kg. of polymer. Specified t-N- containing diols are those of formula where R 1 to R 4 are optionally substituted alkyl or cycloalkyl or R 1 and R 2 may be H; R 5 to R 7 are optionally substituted alkylene or cycloalkylene; and n is 1 to 10, and salts thereof. In examples various diols (ii) (c) are used; (i) and (ii) (a) is 4,4<SP>1</SP>-diisocyanato-methane; (i) and (ii) (b) is a polytetramethylene glycol of M.W. 800, 1000, 1300 or 1320, polylactone diol of M.W. 1250, or a polyester of M.W. 1785 of adipic acid and a mixture of 1,4-butane- and 2,2-dimethylpropane-1,3-diols; and (iii) is 1,1- propylene diamine.