necked flask 1 mole of dodecenylsuccinic anhydride and 1 mole of allylalcohol were reacted together at 110 u00b0 u00b1 5 u00b0 c for 2 hours to form a monoallyl ester of dodecylsuccinic acid the product thus obtained was then converted to its triethanolamine salt whihc is a viscous yellowish brown liquid having a good self emulsifiability in water similarly monoesters hereinafter described were prepared and these monoesters were subjected to a sizing test in the form of amine salts sodium salts or potassium salts and like the degree of sizing the above mentioned sizing agents was measured under conditions set forth below the test results thus obtained are reproduced in table 1 succinic acid is abbreviated as s a each sizing agent was added to a 0 5 aqueous pulp slurry in an amounts of 0 05 0 1 and 0 2 by weight of the sizing agent solid base and then mixed together for 15 minutes ______________________________________pulp concentration 0 5 paper making procedure tappi standard machinebasis weight 70 g m sup 2filler heavy calcium carbonatedrying 110 u00b0 c for 5 minutessizing test jis p8122 stochtigt sizing test______________________________________ table 1__________________________________________________________________________ wt addedsample no sizing agent 0 05 0 1 0 2__________________________________________________________________________1 na salt monoallylester of hexenyl s a 12 23 302 k salt of monopropargyl ester of octenyl s a 11 22 293 tea salt of monooleyl ester of decenyl s a 11 21 294 tea salt of monoallyl ester of dodecenyl s a 12 23 315 mea salt of.