Patent ID: 7851530

Claim:
A rheology modification agent is obtained by reacting one or more polyisocyanates selected from the group consisting of substituted or unsubstituted linear aliphatic polyisocyanates with an even number of carbon atoms in the chain between two isocyanate groups and substituted or unsubstituted arylene, aralkylene, and cyclohexylene polyisocyanates with one or more optically active carbon-substituted methylamines of the formula (I) in enantiomeric excess, or by reacting one or more polyamines selected from the group consisting of substituted or unsubstituted linear aliphatic polyamines with an even number of carbon atoms in the chain between two amino groups and substituted or unsubstituted arylene, aralkylene, and cyclohexylene polyamines with one or more optically active monoisocyanates of the formula (II) in enantiomeric excess, wherein each of R 1 , R 2 , and R 3 are independently selected from the group consisting of hydrogen and linear or branched, substituted or unsubstituted, saturated or unsaturated hydrocarbyl or a heteroatom containing group, whereby each of R 1 , R 2 , and R 3 is different such that the carbon atom is a chiral centre, with the proviso that the amine of formula (I) is not an optically active amino acid and not an optically active amino acid ester, and the isocyanate of formula II is not derived from the amino group of an optically active amino acid or optically active amino acid ester, and with the further proviso that the resulting rheology modification agent is not a compound of the formula (III)