US 8,648,131 B2Granted

Process for the preparation of an artificial latex

AssigneeKraton Polymers U.S. LLC

InventorsArwin W. van der Waal, Marc S. Sonderman, Stephen W. Bourne, Adrie A. van der Huizen, Alexandre Rodrigues da Silva, David H. Brooks

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Abstract

Accordingly, the invention provides a process for the preparation of an artificial latex, comprising the steps: (a) emulsification of a cement comprising a rubber dissolved in a suitable organic solvent, together with an aqueous surfactant solution, thus forming an oil-in-water emulsion; (b) step-wise reduction of the solvent content of the oil-in-water emulsion in two or more stages resulting in an artificial latex. In addition, the invention provides a continuous stirred vessel for removing an organic solvent from an oil-in-water emulsion comprising rubber dissolved in an organic solvent.

Claims18

Dependent claims

Process for the preparation of an artificial latex, comprising the steps:

(a) emulsification of a cement comprising a rubber dissolved in a suitable organic solvent, together with an aqueous surfactant solution, thus forming an oil-in-water emulsion;
(b) step-wise reduction of the solvent content of the oil-in-water emulsion in two or more stages resulting in an artificial latex characterized in that in stage 1 of step (b) part of the solvent is removed via use of a reboiling loop by mixing part of the artificial latex, heated to a temperature above the boiling point of the solvent with the oil-in-water emulsion and allowing the solvent to evaporate, said artificial latex and the oil-in-water emulsion are mixed in a weight ratio of at least 20:1.

Dependencies are inferred from the claim text.