Latex copolymer compositions copolymerized from alkenes, e.g., ethylene, are disclosed. Typical copolymer compositions comprise ethylene, vinyl acetate and optionally other monomers, such as, for example, higher branched vinyl esters, e.g., vinyl neodecanoate. Processes for producing the copolymer compositions are disclosed which can provide enhanced incorporation of the alkene monomer into the copolymer compositions. As a result, the processes can be operated at substantially lower pressures than commonly used for manufacturing alkene-containing latex copolymers.