[C:1](OC)(=O)[CH:2]=C.[C:7]([O:14][CH2:15][CH3:16])(=[O:13])/[CH:8]=[CH:9]\[C:10]([O-:12])=[O:11].C=C.C(OOC(C)(C)C)(=O)C(C)(C)C>C1C=CC=CC=1>[CH2:1]=[CH2:2].[C:7]([O:14][CH3:15])(=[O:13])[CH:8]=[CH2:9].[C:7]([O:14][CH2:15][CH3:16])(=[O:13])/[CH:8]=[CH:9]\[C:10]([O-:12])=[O:11]A mixture of methyl acrylate, monoethyl maleate, and benzene (weight ratio: 68.28/2.46/29.26) was pressured to about 422 kg./sq. cm.; ethylene was separately pressured to about 422 kg./sq. cm. Separate streams of this mixture (0.91 kg./hr.) and ethylene (6.35 kg./hr.) were joined and pressured to 1900 kg./sq. cm. The resulting feed stream then entered the autoclave. Simultaneously, a catalyst solution, made by adding 50 ml. of tert-butyl peroxypivalate to 4.5 kg. of benzene was introduced at the rate of 0.00204 kg./hr. to keep the temperature at 170°C. The effluent from the autoclave passed through a let-down valve to a chamber at atmospheric pressure where most of the residual monomers and solvent flashed off. The ethylene/methyl acrylate/monoethyl maleate terpolymer thus isolated was freed from the small amount of residual volatiles by heating for 16 hours at 80°C. in a nitrogen stream. Acid-base titration indicated that 0.25 meq. of acid groups was present per gram of terpolymer. This corresponds to 3.6 weight percent of monoethyl ester of maleic acid.
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