Preparation of Micro Gel Particle Dispersions and Dry Powders Suitable For Use As Fluid Loss Control Agents
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United States of America Patent
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Issued Date -
Oct 7, 2010
app pub date -
Apr 3, 2009
filing date -
Apr 3, 2009
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Abstract
This invention relates to dispersions and powders of micro gel particles, and more specifically, at least in some instances, dispersions of micro gel particles formed from crosslinked water-soluble or swellable polymers, and methods of preparing such micro gel particle dispersions. In one aspect, the invention provides a method of preparing synthetic micro gel particles, comprising forming a reaction mixture by dissolving or swelling a water-soluble or water-swellable unsaturated monomer, unsaturated crosslinking agent, and radical initiator in a common solvent that is substantially inert toward chain transfer reactions, wherein the monomer and the crosslinking agent polymerize to form crosslinked polymer micro gel particles that are insoluble or at most swellable in the common solvent.
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