Rheology modifiers
AssigneeAkzo Nobel Chemicals International B.V.
InventorsKlin Aloysius Rodrigues, Anthony John Adamo, Samuel Anthony Vona, Jr.
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Abstract
Polysaccharide alkali swellable rheology modifiers include an emulsion polymer including at least one polysaccharide portion and at least one synthetic portion wherein the at least one synthetic portion is obtained from at least one anionic ethylenically unsaturated monomer, at least one nonionic ethylenically unsaturated monomer or a combination thereof; wherein at least one of the nonionic ethylenically unsaturated monomers is a hydrophobic ethylenically unsaturated monomer, as well as methods of making polysaccharide alkali swellable rheology modifiers.
Claims17
A polysaccharide alkali swellable rheology modifier comprising an emulsion polymer comprising at least one polysaccharide portion and at least one synthetic portion, said polysaccharide alkali swellable rheology modifier being obtainable by emulsion polymerizing at least one polysaccharide with at least one anionic ethylenically unsaturated monomer and at least one nonionic ethylenically unsaturated monomer in the presence of an initiating system,
- the emulsion polymer further comprising at least one associative monomer that is an ethylenically unsaturated monomer containing a hydrophobe and a spacer moiety that spaces the hydrophobe from the backbone of the polymer,
- wherein the minimum weight of anionic ethylenically unsaturated monomer is about 15 weight percent or more of the total monomer added to the polymerization process,
- wherein at least one of the at least one nonionic ethylenically unsaturated monomers is a hydrophobic ethylenically unsaturated monomer present in an amount effective to form an emulsion, and
- wherein when the polysaccharide portion is obtained from cellulose or a cellulose derivative, the cellulose or cellulose derivative has about 0.1% or greater solubility in water at 25° C.
A method of making a polysaccharide alkali swellable rheology modifier comprising:
- emulsion polymerizing a polysaccharide with at least one anionic ethylenically unsaturated monomer, and at least one nonionic ethylenically unsaturated monomer in the presence of an initiating system,
- wherein at least one of the at least one nonionic ethylenically unsaturated monomers is a hydrophobic ethylenically unsaturated monomer and is present in an amount effective to form an emulsion, and
- wherein the hydrophobic ethylenically unsaturated monomer is present an amount effective to form an emulsion,
- wherein the minimum weight of anionic ethylenically unsaturated monomer is about 15 weight percent or more of the total monomer added to the polymerization process, and
- wherein the emulsion polymerization step is conducted substantially free of surfactant.
A polysaccharide alkali swellable rheology modifier comprising an emulsion polymer comprising at least one polysaccharide portion and at least one synthetic portion, said polysaccharide alkali swellable rheology modifier being obtainable by emulsion polymerizing at least one polysaccharide with at least one anionic ethylenically unsaturated monomer and at least one nonionic ethylenically unsaturated monomer in the presence of an initiating system,
- wherein the minimum weight of anionic ethylenically unsaturated monomer is about 15 weight percent or more of the total monomer added to the polymerization process,
- wherein at least one of the at least one nonionic ethylenically unsaturated monomers is a hydrophobic ethylenically unsaturated monomer present in an amount effective to form an emulsion,
- wherein when the Polysaccharide portion is obtained from cellulose or a cellulose derivative, the cellulose or cellulose derivative has about 0.1% or greater solubility in water at 25° C., and
- wherein the emulsion polymer is substantially free of surfactant.
Dependencies are inferred from the claim text.