Rheology modification by porous gel particles
AssigneeRhodia Operations
InventorsArnaud Cadix, David James Wilson
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Abstract
Modification of the rheology of a liquid medium, aqueous or nonaqueous, with polymers in the form of specific particles obtained by grinding (micronizing) a porous macrogel, itself prepared by a process comprising a radical polymerization step which comprises reacting in the presence of pore formers monomers containing monomers bearing at least two ethylenic unsaturations, typically in combination with monomers bearing a single ethylenic unsaturation; a polymerization initiator; and optionally a polymerization control agent. These polymer particles keep other particles in suspension within the liquid medium, and also the stabilized suspensions are obtained.
Claims13
A method comprising adding crosslinked polymer particles (p) to a liquid medium, the crosslinked polymer particles (p) obtained by grinding a macrogel prepared by a process comprising a radical polymerization step (E) which comprises reacting, within a reaction medium M comprising pore formers:
- ethylenically unsaturated monomers, containing monomers m1 bearing at least two ethylenic unsaturations;
- at least one radical polymerization initiator;
- optionally at least one radical polymerization control agent
- to modify the rheology of said liquid medium.
A composition comprising:
- a liquid medium, and
- crosslinked polymer particles (p), wherein the crosslinked polymer particles (p) are obtained by grinding a macrogel prepared by a process comprising a radical polymerization step (E) which comprises reacting, within a reaction medium M comprising pore formers:
- ethylenically unsaturated monomers, containing monomers m1 bearing at least two ethylenic unsaturations;
- at least one radical polymerization initiator;
- optionally at least one radical polymerization control agent.
Dependencies are inferred from the claim text.