FIELD: papermaking. SUBSTANCE: sizing substance for paper is 2-oxetane oligomer, which is not in solid state at 35 C, in particular oligomer mixture, wherein at least 25 wt % of hydrocarbon substituents contain branched alkyl radicals and linear and branched alkenyl radicals. These oligomers are prepared by using reaction mixture composed of a fatty acid mixed with excess of a dicarboxylic acid. EFFECT: enabled manufacturing bond paper in alkali conditions. 64 cl, 2 tbl, 7 ex
