Associative acrylic emulsion containing an oxo alcohol-based monomer, its manufacturing method, and method for thickening an aqueous formulation using this emulsion
AssigneeCoatex
InventorsJean-Marc Suau, Denis Ruhlmann
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Abstract
The present invention pertains to particular HASE rheology modifiers: they are aqueous emulsions whose solids content may reach about 25%, based on acrylic thickeners having an associative monomer functionalized by an oxo alcohol based hydrophobic group. Their method of synthesis, as well as a method for thickening an aqueous formulation containing them, also constitute objectives of the present invention.
Claims20
A hydrophobically modified alkali soluble emulsion (HASE) emulsion, comprising:
- water and
- a polymer comprising, in polymerized form:
- a) (meth)acrylic acid,
- b) at least one ester of (meth)acrylic acid, and
- c) at least one monomer according to formula (I):
- R-(AO)m—(BO)n—R′ (I)
- wherein
- m is an integer between 20 and 40,
- n is a whole number less than 150,
- A is ethylene and
- B is an alkylene group having 3 to 4 carbon atoms,
- R designates a polymerizable unsaturated function, and
- R′ is a mixture comprising a C9 to C20 linear alkyl group and a branched alkyl group of formula (II):
- CH3—(CH2)p—CH(CH3)(CH2)r—(CH2)q— (II)
- where p and q designate whole numbers, at least one of which is nonzero, such that 5<p+q<13, and r is a whole number between 0 and 5.
A method for manufacturing a HASE emulsion, comprising forming an emulsion comprising water and at least one polymer comprising, in polymerized form:
- a) (meth)acrylic acid,
- b) at least one ester of (meth)acrylic acid,
- d) at least one monomer of formula (I):
- R-(AO)m—(BO)n—R′ (I)
- wherein
- m and n are each independently whole numbers less than 150, at least one of which is nonzero,
- A and B are each independently alkylene groups of 2 to 4 carbon atoms,
- R is a polymerizable unsaturated function, and
- R′ is a mixture comprising a C9 to C20 linear alkyl group and a branched alkyl group of formula (II):
- CH3—(CH2)p—CH(CH3)(CH2)r—(CH2)q—
- where p and q designate whole numbers, at least one of which is nonzero, where 5<p+q<13, and r is a whole number between 0 and 5;
- wherein the polymerization is conducted
- in the presence of at least one chain transfer agent.
Dependencies are inferred from the claim text.