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US 4,777,200 AGranted
Polymeric compositions and methods of using them
AssigneeAllied Colloids Limited
InventorsBrian Dymond, John Langley, Malcolm Hawe
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AssigneeAllied Colloids Limited
InventorsBrian Dymond, John Langley, Malcolm Hawe
Estimating the term…
Dispersions in water-immiscible liquid of water-soluble or water-swellable polymer particles are stabilized by use of an aqueous emulsion of water insoluble viscosifying polymer particles that are swellable or soluble in the water-immiscible liquid. After adding the emulsion to the water-immiscible liquid, water is removed from around the particles of the viscosifying polymer, preferably by absorption into the water swellable or soluble polymer particles. Water-immiscible liquids in general can be thickened particularly effectively by use of an aqueous emulsion of water insoluble viscosifying polymer particles that are swellable but insoluble in the water-immiscible liquid. These insoluble particles have a dry size below 10 .mu.m and are formed from monomers of which 80 to 100% are hydrophobic, 30 to 100% are polar and hydrophobic, 0 to 20% are hydrophilic and not more than 30% by weight are aromatic.
A process for making a stable dispersion of water-swellable or water-soluble polymer particles in a thickened water-immiscible liquid by adding to a water-immiscible liquid an aqueous emulsion of particles of water insoluble viscosifying polymer, formed by oil-in-water emulsion polymerisation, and then removing water from around the particles of viscosifying polymer by dehydration or agitation of the water-immiscible liquid, whereby the water-immiscible liquid becomes thickened by the viscosifying polymer, and said water-immiscible liquid contains water swellable or water-soluble polymer particles dispersed therein either before or after said aqueous emulsion addition.
A process for making a stable dispersion of water swellable or water-soluble polymer particles in thickened water-immiscible liquid by forming a blend of an aqueous emulsion of water insoluble viscosifying polymer particles formed by oil-in-water emulsion polymerisation, the water-immiscible liquid, and the water swellable polymer particles and agitating the resultant mixture whereby the water swellable polymer particles absorb water from the aqueous emulsion and the water-immiscible liquid becomes thickened by the viscosifying polymer.
A process for making a stable dispersion of water-soluble or water-swellable polymer particles in a thickened water-immiscible liquid by forming a blend of an aqueous emulsion of water-insoluble viscosifying polymer particles formed by oil-in-water emulsion polymerisation and having a hydrophilic shell obtained as a result of forming the polymer particles by polymerisation from monomers including 0.1 to 20% hydrophilic monomers, the water-immiscible liquid, and the water-swellable polymer particles and agitating the resultant mixture whereby the water-soluble or water-swellable polymer particles absorb water from the aqueous emulsion and the water-immiscible liquid becomes thickened by the viscosifying polymer.
Dependencies are inferred from the claim text.