| 摘要 |
<p>A water dispersible blocked polyisocyanate of formula (I) R-Ym, where R is an m valent group comprising an aliphatic, cycloaliphatic, heterocyclic or aromatic group and comprising at least three consecutive ethylene oxide groups or at least one residue of a polyhydroxy carboxylic acid, and each group Y, which may be the same or different, is a group of formula (II), where each R1 is the same or different when n is more than 1 and each R1 is an alkyl, alkenyl, aralkyl, N-substituted carbamyl, phenyl, NO¿2?, halogen or a group -C(O)-O-R?2¿, where R2 is hydrogen or an alkyl group; n is 0, 1, 2 or 3; and m is an integer of 2 or more.</p> |
