Alkali swellable acrylic emulsions without surfactants, use thereof in aqueous formulations, and formulations containing them
AssigneeCoatex
InventorJean-Marc SUAU
Life of this patent
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Abstract
The present invention pertains to new alkali swellable thickening emulsions, free of surfactants and solvents other than water: as a result, all drawbacks related to the use of solvents, or to the formation of foam in the case of surfactants, are avoided. These new emulsions contain a certain quantity of 2-acrylamido-2-methylpropane sulfonic acid (or AMPS, CAS #: 40623-75-4). They have proven effective at thickening aqueous mediums, particularly water-based paints, paper coatings, aqueous suspensions of mineral materials, detergents, cosmetic formulations, or formulations containing a hydraulic binder.
Claims17
A method for manufacturing a direct emulsion of a polymer in water comprising polymerizing monomer group A or monomer group B in a polymerization medium comprising water:
- monomer group A:
- a) 20% to 60% by weight of at least one of methacrylic acid and acrylic acid,
- b) 40% to 80% by weight of at least one ester of (meth)acrylic acid,
- c) 0.05% to 22% by weight of 2-acrylamido-2-methylpropane sulfonic acid,
- d) 0 to 1% by weight of at least one cross-linking monomer,
- the total a)+b)+c)+d) being equal to 100%,
- monomer group B:
- a) 20% to 60% by weight of at least one of methacrylic acid and acrylic acid,
- b) 40% to 80% by weight of at least one ester of (meth)acrylic acid,
- c) 0.5% to 25% by weight of a monomer comprising at least one hydrophobic group,
- d) 0.05% to 22% by weight of 2-acrylamido-2-methylpropane sulfonic acid,
- e) 0 to 1% by weight of at least one cross-linking monomer,
- the total a)+b)+c)+d)+e) being equal to 100%,
- wherein said polymerization medium is free of surfactants and solvents other than water.
A direct emulsion of a polymer in water, wherein said polymer comprises polymerized monomers of monomer group A or monomer group B:
- monomer group A:
- a) 20% to 60% by weight of at least one of methacrylic acid and acrylic acid,
- b) 40% to 80% by weight of at least one ester of (meth)acrylic acid,
- c) 0.05% to 22% by weight of 2-acrylamido-2-methylpropane sulfonic acid,
- d) 0 to 1% by weight of at least one cross-linked monomer,
- the total a)+b)+c)+d) being equal to 100%,
- monomer group B:
- a) 20% to 60% by weight of at least one of methacrylic acid and acrylic acid,
- b) 40% to 80% by weight of at least one ester of (meth)acrylic acid,
- c) 0.5% to 25% by weight of the monomer comprising at least one hydrophobic group,
- d) 0.05% to 22% by weight of 2-acrylamido-2-methylpropane sulfonic acid,
- e) 0 to 1% by weight of at least one cross-linked monomer,
- the total a)+b)+c)+d)+e) being equal to 100%,
- wherein said emulsion is free of surfactants and solvents other than water.
Dependencies are inferred from the claim text.