Method for the synthesis of acrylic (co)polymers from oligomers of acrylic acid
AssigneeArkema France
InventorsJean-Marc Suau, Clementine Champagne
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Abstract
The present invention relates to the synthesis of an associative acrylic (co)polymer by aqueous emulsion radical polymerization. The (co)polymer contains at least one oligomer of acrylic acid represented by the formula (I): where n is an integer ranging from 1 to 10. The oligomer is prepared from acrylic acid at a temperature of between 50° C. and 200° C. in the presence of a basic or acid catalyst, water, and polymerization inhibitors. The present invention also relates to the associative acrylic (co)polymer obtained from the method and also to the use of this (co)polymer as a thickener in various formulations.
Claims9
A method for synthesizing an acrylic (co)polymer, the method comprising:
- (co)polymerizing a mixture comprising
- a. at least one oligomer of acrylic acid represented by formula (I):
- where n is an integer of from 1 to 10, in an aqueous emulsion radical (co)polymerization,
- wherein the at least one oligomer is prepared from acrylic acid at a temperature of between 90° C. and 120° C. in the presence of a basic or acid catalyst, a reaction medium containing between 0.01% and 20% by weight water based on a total weight of acrylic acid monomers, and at least one polymerization inhibitor, and
- wherein said mixture comprises a mixture of oligomers having an acrylic acid dimer and trimer content greater than 20% by weight and a residual acrylic acid content less than 60% by weight based on the total weight of the oligomers of the mixture, and from 10 ppm to 2,000 ppm of the polymerization inhibitors based on a total weight of the mixture.
Dependencies are inferred from the claim text.