Polysaccharides containing aromatic aldehydes and their derivatization via amine-aldehyde interactions

摘要

A polysaccharide derivative having the structure Sacch-O-Z-Ar-CH=N-Y or <IMAGE> where Sacch-O- represents a polysaccharide molecule; Z is -(CH2)n- or <IMAGE> Ar is a divalent aromatic group; Y is (a) a monovalent group derived from a water-soluble substituted or unsubstituted aromatic compound containing only one free primary amine group, or (b) a monovalent group derived from a water-soluble substituted or unsubstituted aliphatic or cycloaliphatic compound containing only one primary amine group, or (c) a multivalent group derived from a water-soluble protein containing more than one primary amine group; n is one or greater; and m is zero or greater, is prepared by first modifying the polysaccharide with a reagent to introduce free aromatic aldehyde groups and then reacting with a suitable amine-containing reagent. The siloxane-containing starch derivaties are useful in glass forming size compositions.