Back to results
US 7,803,864 B2Granted
Associative thickener compositions and methods of use
AssigneeRohm and Haas Company
InventorsBarrett Richard Bobsein, Melissa Merlau Johnson, Lifeng Zhang
Life of this patent
Estimating the term…
Abstract
A method for improving the viscosity stability of an aqueous composition having a latex polymer and associative thickeners with at least one hydrophilic segment and at least two hydrophobic segments is provided. The associative thickeners are chosen such that one associative thickener has a lower molecular weight than the other associative thickener.
Claims11
An aqueous composition, comprising:
- a first associative thickener having at least one hydrophilic segment and at least two hydrophobic segments and a Mw of 6,000 to 21,000;
- a second associative thickener having at least one hydrophilic segment and at least two hydrophobic segments and a Mw of 30,000 to 100,000;
- and
- a latex polymer,
- wherein the Mw of the second associative thickener is at least 1.5 times the Mw of the first associative thickener,
- the hydrophobic segments of the first associative thickener and the second associative thickener have a hydrophobic substituent of at least four carbon atoms, and
- a concentration of the second associative thickener is greater than 1.5 times a concentration of the first associative thickener
- wherein the first and second associative thickeners each comprise a thickener selected from the group consisting of nonionic hydrophobically-modified ethylene oxide urethane copolymers, nonionic hydrophobically-modified ethylene oxide ether copolymers, nonionic hydrophobically-modified ethylene oxide glycouril copolymers, hydrophobically-modified alkali soluble emulsions, hydrophobically-modified poly(meth)acrylic acids, and hydrophobically-modified poly(acrylamide), and mixtures thereof.
5 more elements
A method of improving viscosity stability of an aqueous composition, having a latex polymer, comprising adding to the composition a mixture comprising:
- a first associative thickener having at least one hydrophilic segment and at least two hydrophobic segments and a Mw of 6,000 to 21,000;
- a second associative thickener having at least one hydrophilic segment and at least two hydrophobic segments and a Mw of 30,000 to 100,000,
- wherein the Mw of the second associative thickener is at least 1.5 times the Mw of the first associative thickener,
- the hydrophobic segments of the first associative thickener and the second associative thickener have a hydrophobic substituent of at least four carbon atoms,
- and a concentration of the second associative thickener is greater than 1.5 times a concentration of the first associative thickener,
- wherein the first and second associative thickeners each comprise a thickener selected from the group consisting of nonionic hydrophobically-modified ethylene oxide urethane copolymers, nonionic hydrophobically-modified ethylene oxide ether copolymers, nonionic hydrophobically-modified ethylene oxide glycouril copolymers, hydrophobically-modified alkali soluble emulsions, hydrophobically-modified poly(meth)acrylic acids, and hydrophobically-modified poly(acrylamide), and mixtures thereof.
3 more elements
Dependencies are inferred from the claim text.