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.
本发明涉及封端含双
脲基团的聚
异氰酸酯组合物,其中封端剂选自由式如下的封端剂组成的组:
其中 R
1
, R
2
, R
3
可以相同或不同,并代表选自氢、C
1
-C
4
-烷基和 C
3
-C
6
-环烷基,R
4
代表选自 C
1
-C
4
-烷基、C
6
-C
10
-环烷基或 C
7
-C
14
-芳烷基,且 x 代表 1 至 5 的数字,以及
式中的封端剂:
其中 R
1
, R
2
, R
3
和 R
4
可以相同或不同,并代表选自氢、C
1
-C
6
-烷基和 C
3
-C
6
-环烷基,R
5
代表选自 C
1
-C
10
-烷基和 C
3
-C
10
-环烷基,而 B 是符合以下结构式之一的基团
其中 R
6
, R
7
和 R
8
可以相同或不同,并代表选自 C
1
-C
6
-烷基和 C
3
-C
6
-环烷基和 R
9
是选自氢、C
1
-C
6
-烷基和 C
3
-C
6
-环烷基。