STRUCTURE AND PAPERMAKING PROPERTIES OF A MINOALKYLXYLANS

4-O-Methylglucuronoxylan from beechwood meal and the water-insoluble a rabino-(4-O-methylglucurono)xylan from corn cobs have been modified in aqueous alkaline medium with 3-chloro-2-hydroxy-propyltrimethylammoni um chloride. The resulting TMAHP-xylans represent amphoteric derivativ es which differ in the proportion oi TMAHP- and carboxyl groups. The d erivatives were characterized and tested as papermaking additives by V arious laboratory methods. In these tests, the lower substituted beech wood xylan derivative shows properties of retention and strength impro ving aids.