A product obtainable by reacting components a), b) and c), where component a) is a compound of the formula I or a mixture of compounds of the formula I, component b) is a compound of the formula II or a mixture of compounds of the formula II and component c) is a compound of the formula III or a mixture of compounds of the formula III, ##STR84## in which, in the compound of the formula I, the radicals Y independently of one another are OH or --HNR.sub.1 and the radical R.sub.1 is ##STR85## in which R.sub.2 is hydrogen, C.sub.1 -C.sub.8 alkyl, O, OH, NO, --CH.sub.2 CN, C.sub.1 -C.sub.18 alkoxy, C.sub.5 -C.sub.12 cycloalkoxy, C.sub.3 -C.sub.6 alkenyl, C.sub.7 -C.sub.9 phenylalkyl or C.sub.7 -C.sub.9 phenylalkyl which is mono-, di- or trisubstituted on the phenyl ring by C.sub.1 -C.sub.4 alkyl, or R.sub.2 is furthermore C.sub.1 -C.sub.8 acyl or HOCH.sub.2 CH.sub.2 --, and a is the number 1 or 2, where,
- if Y is OH and a is 1,
- X is ##STR86## in which R.sub.2 is as defined above, or if Y is OH and a is 2,
- X is ##STR87## or if Y is HNR.sub.1 and a is 1,
- X is ##STR88## in which R.sub.2 is as defined above, and in the compound of the formula II, the radicals Z are hydrogen or a group of the formula ##STR89## and k is an integer ranging from 0 to 6, in which
- h is 2 or 3,
- i is an integer ranging from 0 to 12 and
- R.sub.11 is C.sub.1 -C.sub.30 alkyl, C.sub.8 -C.sub.30 alkenyl, C.sub.5 -C.sub.12 cycloalkyl, phenyl or C.sub.7 -C.sub.9 phenylalkyl, with the proviso that the compound of the formula II has a group ##STR90## in the compound of the formula III, R.sub.12 is C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.12 cycloalkyl, phenyl or C.sub.7 -C.sub.9 phenylalkyl,
- R.sub.15 is hydrogen, C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.12 cycloalkyl, phenyl or C.sub.7 -C.sub.9 phenylalkyl,
- s is 0, 1 or 2,
- Q is ##STR91## in which R.sub.15 is as defined above, m is an integer ranging from 0 to 3,
- R.sub.16 is C.sub.1 -C.sub.8 alkyl and
- n is an integer ranging from 1 to 6, where,
- if n is 1,
- R.sub.17 is hydrogen, C.sub.1 -C.sub.45 alkyl, C.sub.5 -C.sub.12 cycloalkyl, C.sub.2 -C.sub.18 alkenyl, a monovalent radical of a hexose, a monovalent radical of a hexitol, ##STR92## in which R.sub.2 is as defined above, or furthermore R.sub.17 is --CH.sub.2 CH.sub.2 --T.sub.3 R.sub.19 or ##STR93## in which T.sub.3 is oxygen, sulfur or >N--R.sub.22,
- R.sub.19 is ##STR94## in which R.sub.12 and R.sub.15 are as defined above, or R.sub.19 is furthermore hydrogen, C.sub.1 -C.sub.24 alkyl, phenyl, C.sub.5 -C.sub.12 cycloalkyl or ##STR95## in which p is an integer ranging from 2 to 4,
- q is an integer ranging from 2 to 20,
- R.sub.22 is C.sub.1 -C.sub.18 alkyl, phenyl or phenyl which is substituted by 1 to 3 radicals A.sub.1, in which the radicals
- A.sub.1 independently of one another are C.sub.1 -C.sub.12 alkyl, halogen, hydroxyl, methoxy or ethoxy, or R.sub.22 is furthermore C.sub.5 -C.sub.8 cycloalkyl,
- R.sub.23 and R.sub.24 independently of one another are hydrogen or methyl, with the proviso that R.sub.23 and R.sub.24 are not simultaneously methyl;
- R.sub.25 is hydrogen or C.sub.1 -C.sub.24 alkyl, or,
- if n is 2,
- R.sub.17 is a divalent radical of a hexose, a divalent radical of a hexitol, ##STR96## in which p and q are as defined above, ##STR97## in which R.sub.18 and R.sub.20 independently of one another are hydrogen or C.sub.1 -C.sub.12 alkyl or together are the radical --CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 --,
- r is an integer ranging from 2 to 10,
- T.sub.4 is sulfur, >N--R.sub.26 or ##STR98## in which R.sub.7 and R.sub.8 are independently of one another hydrogen, C.sub.1 -C.sub.18 alkyl or phenyl, or R.sub.7 and R.sub.8 together with the C atom to which they are bonded form a C.sub.5 -C.sub.12 cycloalkyl ring, and
- R.sub.26 is hydrogen, C.sub.1 -C.sub.18 alkyl, phenyl or phenyl which is substituted by 1 to 3 radicals A.sub.1, in which the radicals A.sub.1 are as defined above, or
- R.sub.26 is furthermore C.sub.5 -C.sub.8 cycloalkyl or ##STR99## in which R.sub.2 is as defined above, or, if n is 3,
- R.sub.17 is a trivalent radical of a hexose, a trivalent radical of a hexitol, ##STR100## in which R.sub.27 is hydrogen, CH.sub.2 OH, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.18 alkylamido or ##STR101## in which Q, R.sub.12 and R.sub.15 are as defined above, or,
- if n is 4,
- R.sub.17 is a tetravalent radical of a hexose, a tetravalent radical of a hexitol, C.sub.4 -C.sub.10 alkanetetrayl, ##STR102## or if n is 5,
- R.sub.17 is a pentavalent radical of a hexose or a pentavalent radical of a hexitol, or,
- if n is 6,
- R.sub.17 is a hexavalent radical of a hexitol or ##STR103##