The Dow Chemical Company

Lewis E Chumbley

Donald A Tomalia

Russell T McFadden

James W Lalk

Juan Longoria, Iii

Robert J Thomas

Lawrence L Sams, Ii

A thermoplastic polycarbonate formed by reacting a carbonyl halide such as phosgene, a dihydric phenol, and a 2-methylepichlorohydrin residue-dihydric phenol prepolymer under polycarbonate forming conditions.

Polycarbonates incorporating 2-methylepichlorohydrin

Novel cellulosic sizing agents are described. They are ring-opened aziridinyl homopolymers of ##EQU1## wherein R.sub.1 and R.sub.2 are hydrogen or lower alkyl; R.sub.3 is hydrogen or methyl; R.sub.4 is an organic hydrophobic group (e.g., C.sub.8 -C.sub.24 alkyl radical); and X is oxygen or amido nitrogen. The above homopolymers can also be blended with cationic starch to form useful sizing compositions. These sizing agents are normally employed as aqueous emulsions. E.g., paper having excellent sizing properties was prepared from a paper pulp containing a mixture of cationic starch and poly[stearyl 3-(1-aziridinyl)propionate].

Cellulosic sizing agents

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Lake Jackson, TX, United States of America

Lewis E Chumbley