Patent ID: 7276572

Claim:
An aspartate of the formula: where X represents an m-valent organic residue obtained by removing the primary amino group or groups from a mono or polyamine which has (cyclo)aliphatically bound amino groups and a number average molecular weight of 60 to 6000, and which may contain further functional groups that either are reactive with isocyanate groups or are inert to isocyanate groups at temperatures of up to 100° C., R 1 and R 2 may be identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100° C. or less, R 3 and R 4 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100° C. or less, R 5 represents hydrogen or together with R 5′ and the carbon atoms to which they are connected forms a six-membered cycloalkyl group, with said cycloalkyl group being substituted with from 0 to 3 alkyl groups having from 1 to 3 carbon atoms, R 5′ represents a moiety selected from the group consisting of i) C 1 to C 8 alkyl groups which may be interrupted with an oxygen atom, ii) C 6 to C 10 aryl groups, which may be substituted with up to three alkyl groups having from 1 to 3 carbon atoms and iii) C 6 to C 12 cycloalkyl groups, which may be substituted with up to three alkyl groups having from 1 to 3 carbon atoms, R 6 represents hydrogen or together with R 6′ and the carbon atoms to which they are connected forms a six-membered cycloalkyl group, with said cycloalkyl group being substituted with from 0 to 3 alkyl groups having from 1 to 3 carbon atoms, R 6′ represents a moiety selected from the group consisting of i) C 1 to C 8 alkyl groups which may be interrupted with an oxygen atom, ii) C 6 to C 10 aryl groups, which may be substituted with up to three alkyl groups having from 1 to 3 carbon atoms and iii) C 6 to C 12 cycloalkyl groups, which may be substituted with up to three alkyl groups having from 1 to 3 carbon atoms, with the proviso that R 5 and R 6 are the same and R 5′ and R 6′ are the same, and a and b represent integers of from 1 to 5, provided that the sum of a and b is from 2 to 6.