Polymerization process
AssigneeImperial Chemical Industries PLC
InventorsAlan S. Baker, Stephen J. Butterworth, Ravinder K. Jheeta
Life of this patent
Estimating the term…
Abstract
The invention provides a process for producing a water-in-oil emulsion of a water-soluble polyacrylamide or polyacrylic acid polymer or copolymer by the inverse emulsion process characterized in that there is used as the emulsifying agent for the water-in-oil emulsion a water-insoluble, oil-soluble surface active agent of the formula (I): X--Y--Z I or a functional derivative thereof, wherein X- represents a saturated or unsaturated hydrocarbon chain containing from 30 to 500 carbon atoms, --Y-- represents a succinic anhydride residue carried terminally upon the group X--, and --Z represents a hydrophilic group carried by the group --Y--.
Claims10
A water-in-oil emulsion having an acrylamide or acrylic acid homopolymer or copolymer dissolved in the aqueous phase thereof, wherein there is used as the emulsifying agent for the emulsion a water-insoluble, oil-soluble surface active agent of the formula (I):
- X--Y--Z
- or a functional derivative thereof, wherein:
- X represents a saturated or unsaturated hydrocarbon chain containing from 30 to 500 carbon atoms;
- Y is carried terminally upon the group X and is the succinic anhydride residue obtained from the reaction of a succinic anhydride group with a compound containing the group Z;
- Z represents a hydrophilic group carried by the group Y and is derived from an alcohol, a polyol, an amine, a polyamide, a compound containing both hydroxyl and amino groups or a compound containing carboxylic acid groups in addition to the hydroxyl and/or amino groups.
An inverse emulsion polymerization process for producing a water-in-oil emulsion of a water-soluble polyacrylamide or polyacrylic acid polymer or copolymer comprising the steps of mixing together with agitation an aqueous solution of a monomer or monomers to be polymerized and an oil phase to produce a substantially homogeneous emulsion, and polymerizing the monomer or monomers;
- wherein the oil phase is a solution containing a water-insoluble, oil-soluble surface active emulsifying agent of the formula (I):
- X--Y--Z (I)
- or a functional derivative thereof, wherein:
- X represents a saturated or unsaturated hydrocarbon chain containing from 30 to 500 carbons;
- Y is carried terminally upon the group X and is the succinic anhydride residue obtained from the reaction of a succinic anhydride group with a compound containing the group Z;
- Z represents a hydrophilic group carried by the group Y and is derived from an alcohol, a polyol, an amine, a polyamine, a compound containing both hydroxyl and amino groups or a compound containing carboxylic acid groups in additions to the hydroxyl and/or amino groups.
Dependencies are inferred from the claim text.