about 40 by weight of fortified and or non fortified rosin water and from about 1 to about 10 preferably from about 3 to about 6 by weight of a polyethoxylated sulfated material derived from rosin optionally other additives such as extenders may be present the sizing agents pursuant to the present invention are especially well suited for the sizing of paper as utilized herein the expression high free rosin content designates that at least about 80 preferably at least about 90 of the rosin material is present as free rosin for the preparation of the fortified rosin use may be made of u03b1 u03b2 unsaturated aliphatic carboxylic acids and their anhydrides such as fumaric acid maleic acid acrylic acid itaconic acid citraconic acid maleic anhydride itaconic anhydride and citraconic anhydride it is also possible to use acid mixtures of the aforementioned compounds for the preparation of the fortified rosin if desired it is also possible to use mixtures of different fortified rosins the extenders which are useful in the present invention include any customary extender such as waxes petroleum rosins terpene rosins and the like the dispersing agents which are useful in the practice of the present invention may be prepared in the following manner first an adduct is prepared in a typical manner as by adding ethylene oxide to a normal rosin may be fortified or non fortified depending upon the reaction conditions and the chosen initial compound a product having a varying degree of ethoxylation may result preferably the degree of ethoxylation will be such that the final.