Aqueous solution of (meth)acrylic fluid comb-branched polymers with a solid content greater than 60%, manufacturing method and use as a plasticizing agent
AssigneeCoatex
InventorsJean-Marc Suau, David Platel
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Abstract
The present invention pertains to an aqueous solution of comb-branched polymers, having a (meth)acrylic skeleton functionalized by side-chains with hydrophilic alcoxy- or hydroxy-polyalkylene glycol functions, said solution remaining stable and workable at dry solids content levels greater than 60% of its weight. The invention also pertains to a method for manufacturing such solutions, as well as their use as a plasticizing agent, and hydraulic binder-based compositions containing them.
Claims17
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.
An aqueous solution having a solids content greater than 60% by dry comb-branched polymer weight, comprising water and a (meth)acrylic comb-branched polymer functionalized by alcoxy- or hydroxy-polyalkylene glycol side-chains comprising, in polymerized form, (meth)acrylic acid and an 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%.
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 more than 60% by weight of the water compared to the total weight of the water and polymer.
Dependencies are inferred from the claim text.