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US 5,393,827 AGranted
Preparation of high solids polymeric microemulsions
AssigneeCytec Technology Corp.
InventorsDavid L. Dauplaise, Michael P. O'Toole
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Abstract
A novel method for preparing anionic, cationic or non-ionic polymeric microemulsions comprising a multi-step process to achieve high solids and low emulsifier and oil content. The polymeric microemulsions are useful in papermaking as retention aids, in solid-liquid separation as flocculants and in enhanced oil recovery as a drive fluid.
Claims10
A method of preparing an improved high solids polymer water-in-oil microemulsion at relatively low surfactant levels comprising:
- (a) preparing an oil phase comprising:
- (i) at least one hydrocarbon;
- and
- (ii) an effective amount of a surfactant or mixture of surfactants to form a microemulsion upon the addition of an aqueous phase;
- (b) preparing an aqueous phase comprising:
- (i) at least one ethylenically unsaturated monomer in an amount of at least about 27 percent by weight of the total weight of aqueous phase and oil phase;
- (c) adding a portion of said aqueous phase (b) to said oil phase (a) to form a microemulsion and polymerizing;
- and
- (d) adding another portion of said aqueous phase (b). to the product of step (c) to form a microemulsion and polymerizing;
- wherein the emulsifier to monomer ratio after the final portion addition is below about 0.30 and the microemulsion produced by said method has improved performance over a microemulsion formed from a method comprising a single addition of the same total amount of aqueous phase.
7 more elements
Dependencies are inferred from the claim text.