| 摘要 |
The present invention is directed to blocked biuret group-containing polyisocyanate compositions, wherein the blocking agent is selected from the group consisting of a blocking agent of the formula:
wherein R 1 , R 2 , R 3 may be identical or different and represent a moiety selected from the group consisting of hydrogen, C 1 -C 4 -alkyl and C 3 -C 6- cycloalkyl, R 4 represents a moiety selected from the group consisting of C 1 -C 4 -alkyl, C 6 -C 10 -cycloalkyl or C 7 -C 14 -aralkyl, and x represents a number of from 1 to 5 , and
a blocking agent of the formula:
wherein R 1 , R 2 , R 3 and R 4 may be the same or different and represent a moiety selected from the group consisting of hydrogen, C 1 -C 6 -alkyl and C 3- C 6 -cycloalkyl, R 5 represents a moiety selected from the group consisting of C 1 -C 10 -alkyl and C 3 -C 10 -cycloalkyl, and B is a group according to one of the following structural formulas
wherein each occurrence of R 6 , R 7 , and R 8 may be the same or different and represent a moiety selected from the group consisting of C 1 -C 6 -alkyl and C 3 -C 6 -cycloalkyl and R 9 is a moiety selected from the group consisting of hydrogen, C 1 -C 6 -alkyl and C 3 -C 6 -cycloalkyl. |
