초록 ▼

Rubbery polymers in hydrocarbon solutions are emulsified in aqueous liquids and converted to latices by partitioning the emulsion through a membrane of selective permeability to the hydrocarbon solvent relative to both water and the polymer, thereby removing the hydrocarbon solvent from the emulsion

Rubbery polymers in hydrocarbon solutions are emulsified in aqueous liquids and converted to latices by partitioning the emulsion through a membrane of selective permeability to the hydrocarbon solvent relative to both water and the polymer, thereby removing the hydrocarbon solvent from the emulsion. The foaming that is often associated with removing hydrocarbon solvent from aqueous emulsions by conventional means is thus avoided. Membrane partitioning mechanisms that are useful for this application include those involving both nonporous and microporous membranes, those passing the solvent both as a liquid and as a gas, those drawing off the permeate as both a liquid and a gas, and various combinations of these methods.

대표청구항 ▼

[ What is claimed is:] [1.] In a process for the preparation of a rubbery polymer latex from a solution of a rubbery polymer in a hydrocarbon solvent by emulsifing said solution in an aqueous liquid to create an oil-in-water emulsion and removing hydrocarbon solvent from said emulsion to form a late

[ What is claimed is:] [1.] In a process for the preparation of a rubbery polymer latex from a solution of a rubbery polymer in a hydrocarbon solvent by emulsifing said solution in an aqueous liquid to create an oil-in-water emulsion and removing hydrocarbon solvent from said emulsion to form a latex, the improvement comprising removing said hydrocarbon solvent by partitioning said emulsion through a membrane having a feed side and a permeate side, said membrane preferentially passing said hydrocarbon solvent relative to water and to said rubbery polymer, leaving a rubbery polymer latex on said feed side of said membrane.