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US 4,528,321 AGranted
Polymer dispersions and their preparation
AssigneeAllied Colloids Limited
InventorsAdrian S. Allen, Peter Flesher
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AssigneeAllied Colloids Limited
InventorsAdrian S. Allen, Peter Flesher
Estimating the term…
A dispersion of water soluble or water swellable polymer in water immiscible liquid is made by reverse phase polymerization utilizing a dispersing system comprising a polymerization stabilizer and the resulting dispersion, optionally after dehydration, may be distributed into water utilizing a distributing system. The dispersing system or the distributing system, or both, includes at least one non-ionic compound selected from C.sub.6-12 alkanols, C.sub.4-12 alkylene glycol monoethers and their C.sub.1-4 alkanoates, C.sub.6-12 polyalkylene glycol monoethers and their C.sub.1-4 alkanoates and benzyl alcohol. Novel dispersions are made by reverse phase polymerization and, in particular, include a non-ionic compound selected from C.sub.4-12 alkylene glycol monoethers, their C.sub.1-4 alkanoates and C.sub.6-12 polyalkylene glycol monoethers and their C.sub.1-4 alkanoates. When the polymer is water soluble a solution of it in water can be made by distributing the dispersion into water.
A reverse phase polymerisation process for making a dispersion in water immiscible liquid of water soluble or water swellable polymer and comprising dispersing an aqueous solution of polymerisable monomer in water immiscible liquid in the presense of a dispersing system comprising a polymerisation stabiliser and polymerising the monomer, and in which the dispersing system includes at least one non-ionic compound selected from C.sub.6-12 alkanols, C.sub.4-12 alkylene glycol monoethers and their C.sub.1-4 alkanoates, C.sub.6-12 polyalkylene glycol monoethers and their C.sub.1-4 alkanoates and benzyl alcohol.
A reverse phase polymerisation process for making a dispersion in water immiscible liquid of water soluble or water swellable polymer and comprising dispersing an aqueous solution of polymerisable monomer in water immiscible liquid in the presence of a dispersing system comprising a polymerisation stabiliser and polymerising the monomer, and adding a distributing system for promoting distribution of the dispersion into water, and in which the distributing system includes at least one non-ionic compound selected from C.sub.4-12 alkylene glycol monoethers and their C.sub.1-4 alkanoates, C.sub.6-12 polyalkylene glycol monoethers and their C.sub.1-4 alkanoates and benzyl alcohol, and the distributing system includes oil-in-water emulsifier in an amount selected from zero and amounts insufficient to result in formation of a stable oil-in-water emulsion upon stirring the dispersion into water.
A dispersion in a water immiscible liquid of water soluble or water swellable polymer particles and which has been made by reverse phase polymerisation in the water immiscible liquid and which includes a non-ionic compound selected from C.sub.4-12 alkylene glycol monoethers, their C.sub.1-4 alkanoates, C.sub.6-12 polyalkylene glycol monoethers and their C.sub.1-4 alkanoates.
Dependencies are inferred from the claim text.