Polysaccharides with alkyl-aryl hydrophobes and latex compositions containing same
AssigneeUnion Carbide Corporation
InventorsEmmett Malone Partain, III, George Lewis Brode, II, Richard Charles Hoy
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Abstract
Polysaccharides, including hydroxyethyl cellulose, having alkyl-aryl hydrophobic substitution, provide latex compositions, such as paints, with improved rheology and stability. Improved processes for producing such polysaccharides are also provided.
Claims64
An alkyl-aryl hydrophobically modified hydroxyethyl cellulose useful as an associative thickener in an aqueous protective coating composition, characterized in that the alkyl-aryl hydrophobically modified hydroxyethyl cellulose has a molecular weight of from about 15,000 to about 5,880,000 and a degree of alkyl-aryl substitution of from 0.09 to about 8.58 weight percent, said alkyl-aryl having from about 10 to about 24 carbon atoms.
An alkyl-aryl hydrophobically modified cellulose ether useful as an associative thickener in an aqueous protective coating, characterized in that the alkyl-aryl hydrophobically modified cellulose ether has a molecular weight of from about 15,000 to about 5,880,000 and a degree of alkyl-aryl substitution of from 0.09 to about 8.58 weight percent, said alkyl-aryl having from about 10 to about 24 carbon atoms.
A water-soluble, hydrophobically modified cellulose ether characterized in that said cellulose ether comprises (1) from 1.5 to about 6 moles of an ether substituent per mole of cellulose repeat unit, (2) an alkyl-aryl substituent having from about 10 to about 24 carbon atoms in an amount of from 0.001 to about 0.1 moles of alkyl-aryl substituent per mole of cellulose repeat unit, and (3) from 50 to 20,000 cellulose repeat units per mole of cellulose ether.
A water-soluble, nonionic or anionic, hydrophobically modified hydroxyethyl cellulose characterized in that the degree of hydroxyethyl cellulose characterized in that the degree of hydroxyethyl substitution is from about 3 to about 5 moles per mole of cellulose repeat unit, the degree of hydrophobe substitution is from about 0.005 to 0.03 moles per mole of cellulose repeat unit, said hydrophobe comprising an alkyl-aryl group having from about 15 to about 18 carbon atoms, said hydroxyethyl cellulose having from about 250 to 4,000 cellulose repeat units.
The hydroxyethyl cellulose of claim, 24 wherein the alkyl-aryl group is nonylphenyl.
An alkyl-aryl hydrophobically modified hydroxyethylcellulose useful as an associative thickener in an aqueous protective coating, characterized in that the alkyl-aryl hydrophobically modified hydroxyethylcellulose provides a leveling value of not less than 7 and a sag value of not less than 12 and a Stormer Viscosity of not less than 83 KU.
An alkyl-aryl hydrophobically modified cellulose ether useful as an associative thickener in an aqueous protective coating, characterized in that the alkyl-aryl hydrophobically modified cellulose ether provides, in an acrylic latex paint formulation, a leveling value of not less than 7 and a sag value of not less than 12 and a Stormer Viscosity of not less than 83 KU.
Dependencies are inferred from the claim text.