| 摘要 |
<p>Cross-linking agents containing or adapted to generate methylene diester or diamide groups of formula -(Z)m.Y.X.C(R1R2).X.Y.(Z)¿n?- (where each X and Z is selected from -O-, -S- and -NR- (where R is hydrogen or an organic group); each Y is carbonyl, thiocarbonyl, sulphonyl, phosphoryl or a similar acid-forming group; m and n are each zero or 1; and R?1 and R2¿ are each hydrogen, an organic group or a group -X.Y(Z)¿m?-, or together form a divalent organic group) are useful in the preparation of substrates containing biodegradable cross-linking groups.</p> |
