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US 4,623,678 AGranted
Method for shear coagulation of latex resins
AssigneeThe Dow Chemical Company
InventorsEugene R. Moore, Norman A. Lefevre
Life of this patent
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Abstract
In accordance with the present invention, solids are recovered from a latex stabilized with a pH sensitive emulsifier by passing carbon dioxide through the latex to lower the pH and thereby destabilize the latex and then subjecting the latex to high shear.
Claims24
A process for shear coagulating a latex resin to form a paste-like product, comprising the steps of:
- (A) providing a latex stabilized with a pH sensitive emulsifier mixture and having a pH above 7.5;
- (B) destabilizing said latex by contacting said latex with gaseous carbon dioxide;
- and
- (C) subjecting said latex to high shear in an amount sufficient to coagulate said latex.
1 more element
A process for coagulating a stabilized aqueous latex resin emulsion stabilized by an effective amount of a pH sensitive emulsifier and having a pH of from at least 7.5 to about 12.0 comprising the steps of:
- (A) contacting said emulsion with gaseous carbon dioxide in an amount effective to lower the pH of said emulsion to a pH of from about 6.0 up to 7.5 at which said pH sensitive emulsifier is not effective to stabilize said emulsion;
- and
- (B) shear coagulating said latex to form a paste-like product.
Dependencies are inferred from the claim text.