Patent ID: 6031044
Filing Date: 2000-02-29
Classification: C08G,Y10S,Y10T

Abstract:
A polyurethane which is substantially self-dispersible in water and has a number-average molecular weight M.sub.n of more than 2700, which is obtained by reactinga) at least one polyisocyanate withb) at least one polyol consisting ofb1) from 9 to 100 mol-% of a polyol or a mixture of two or more polyols having a molecular weight of at least 500 andb2) from 0 to 91 mol-% of a polyol or a mixture of two or more polyols having a molecular weight of less than 500,b1) and b2) together making up 100 mol-% of component b), andc) at least one photoinitiator of the formula I ##STR6## where R is a radical of the formula II ##STR7## or is --CR.sup.7 R.sup.8 R.sup.9, P(.dbd.O)(R.sup.10).sub.2 or SO.sub.2 R.sup.11and at least one of the radicals R.sup.1, R.sup.2, R.sup.5, R.sup.6, and R.sup.9 is used for incorporation into the polyurethane and the remaining radicals, one or more of the R.sup.1, R.sup.2, R.sup.5, R.sup.6, and R.sup.9,each independently are hydrogen, C.sub.1-12 -alkyl, C.sub.1-12 -alkoxy, halogen, cyano, nitro or sulfo,R.sup.3 and R.sup.4 each independently are hydrogen or COOH or together are S,R.sup.7 and R.sup.8 each independently are hydrogen, C.sub.1-12 -alkyl, C.sub.1-12 -alkenyl, C.sub.1-12 -alkoxy or phenyl or together are .dbd.O or C.sub.2-6 -alkylene, R.sup.9 is OR.sup.11, N(R.sup.11).sub.2, N-piperidyl, N-piperazyl or N-morpholino, R.sup.10 is C.sub.1-12 -alkyl, C.sub.1-12 -alkanoyl, phenyl or benzoyl, each of which can in turn be substituted by halogen, C.sub.1-12 -alkyl or C.sub.1-12 -alkoxy, R.sup.11,independently at each occurrence, is hydrogen is unsubstituted or OH--, NHR.sup.10 --, NH.sub.2 -- or SH-substituted C.sub.1-6 -alkyl, C.sub.1-12 -alkoxy or phenyl, or together are C.sub.2-5 -alkylene, and,if R.sup.9 is OR.sup.11 and R.sup.11 is hydrogen, R.sup.7 and R.sup.8 in combination cannot be hydrogen and phenyl;wherein said polyol b1) is selected from the group consisting of a polyester polyol, a polycarbonate diol, a lactone polyester diol and a polyether diol; wherein said polyester polyol is formed by reacting an alcohol with a polycarboxylic acid; and wherein said polycarboxylic acid is represented by the formula: HOOC--(CH.sub.2)Y--COOH; andwherein said polyol b2) is selected from the group consisting of an alcohol of formula HO--(CH.sub.2)13 OH, where x is 1 to 20, neopentyl glycol, a bis(hydroxymethyl)cyclohexane, 2-methyl-1,3-propanediol, methylpentanediol, diethyl glycol, triethyl glycol, tetraethyl glycol, polyethylene glycol, dipropylene glycol, polypropylene glycol, dibutylene glycol and polybutylene glycol.