Ethylene → Ethylene/methyl acrylate monoethyl maleate

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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 (0.91kg/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, corresponding to 3.6 weight % monoethyl maleate in the copolymer.

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