Patent ID: 8575241

Claim:
A method, comprising: combining water, (meth)acrylic acid, and at least one alcoxy- or hydroxy-polyalkylene glycol macromonomer of formula (I): R-(EO)-(PO)-R′ (I) wherein EO and PO respectively designate multiple ethylene oxide and propylene oxide units, in random or block distribution, R designates a polymerizable unsaturated function, R′ represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and wherein said macromonomer: exhibits a molecular weight of between 1,000 g/mol and 10,000 g/mol, and has a % by mass of the PO group compared to the total mass of the EO and PO groups of 15%-95%, and causing a reaction between the (meth)acrylic acid and the at least one macromonomer of formula (I) to occur and provide a comb-branched polymer aqueous solution, wherein the reaction takes place in the presence of less than 40% by weight of the water compared to the total weight of the water and polymer.