INDUSTRIALAND ENGINEERING CHEMISTRY 473 nated rubber, the solvent strength as measurd by the dilution ratio is of considerable importance.2. The compatibility of blown castor oil with chlorinated rubber, some other blown oils, and some alkyds, is dependent upon the strength of the solvent used. Strong solvents as measured by their dilution ratio enhance compatibility.3. No particular plasticizer is best for use with chlorinated rubber. Different plasticizers impart totally different results at different loading percentages. The choice of plasticizers will be dictated by the ultimate properties desired. More frequently than not, the use of two or more plasticizers will be necessary to obtain the optimum properties for any given application. 4. Consideration of the fundamental principles and trends presented in this paper will be helpful in the formulation of chlorinated rubber finishes for a wider variety of uses, and products of an improved nature will be the result.

Table I. Previous Preparations and Physical Properties of Methyl and Ethyl «-Acetoxypropionate Acetyl Derivative Lactic Acid Acylating Yield, Distillation Derivative or Catalyst Temp., Time, % of Temp., Methanol Methyl lactate Acetyl chloride, °c. Hr. theoretical 0 C. CC.) CC.) Methyl Mactate excess Acetyl chloride Pyridine (2.2 g.

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May 5, l9d.3 N-SUBSTITUTED LACTAMIDES 2097 the catalyst and solvent left a red sirup which readily crystallized to a yellow solid when heated with 100 ml. of water and 20 ml. of concentrated ammonium hydroxide. Most of the color could be removed by slurrying with cold ethyl acetate. Three experiments gave 25.2, 23.2 and 26.5 g. of crude product (melting above 146') suitable for the next step. A sample recrystallized from ethanol melted a t 154-155" uncor.Anal. Calcd. for C1,

Because of their potential importance as plasticizers (1) and synthetic lubricants, the laurates of several lactic esters were prepared and studied. The preparation and physical properties of these lactate laurates [H(CH2)nCOOCH(CH3) COOR] are described in this paper.