Surfactant composition for inverse emulsion polymerization of polyacrylamide and process of using the same
AssigneeImperial Chemical Industries PLC
InventorsSteven Irene Jozef Reekmans, Phillip Cornet
Life of this patent
Estimating the term…
Abstract
Polyacrylamide is made by inverse emulsion polymerisation using an oil phase including at least one ester based oil, particularly a vegetable oil, using a primary emulsification system including a polymeric carboxylic surfactant; a low HLB emulsifier; and an oil phase structurant, particularly an ester wax such as beeswax. The use of the combination emulsifier enables the use of vegetable oils especially rape seed (including canola) oil as the continuous in the polymerisation step.
Claims43
A method of making polyacrylamide by inverse emulsion polymerisation which comprises dispersing an aqueous solution of polymerisablemonomers including acrylamidein an oil phase including at least one ester based oil, wherein the system also includes a surfactant composition which includes:
- a polymeric carboxylic surfactant
- b a low HLB emulsifier;
- and
- c an oil phase structurant, and polymerising the polymerisable monomers to form a colloidal suspension of the resulting polyacrylamide polymer particles, in water, in the oil.
A surfactant combination including:
- a) a polymeric surfactant;
- b) a low HLB emulsifier;
- and c) an oil phase structurant.
Dependencies are inferred from the claim text.