Synthetic polymer
AssigneeNL Industries, Inc.
InventorsHan B. Yun, Alfred J. Whitton
Life of this patent
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Abstract
There is provided a synthetic polymer useful as a thickener in aqueous compositions. The polymer preferably comprises the reaction product of methacrylic acid, methyl methacrylate and vinyl acetate in certain specified proportions. The thickener is particularly effective in latex paint formulations.
Claims23
A polymer of (a) from about 15 to about 35% by weight, of methacrylic acid, (b) from about 5 to about 70% by weight, of at least one ester of methacrylic acid represented by the structural formula:
- ##STR3## wherein R is saturated or unsaturated and represents an alkyl group having from 1 to 20 carbon atoms, and (c) from about 5 to about 80% by weight, of at least one vinyl ester of a saturated aliphatic carboxylic acid, wherein the acid has from 1 to 10 carbon atoms.
An aqueous polymer emulsion useful as a thickening agent in aqueous compositions when the polymer is dissolved therein, which comprises water and emulsified polymer particles prepared from monomers consisting essentially of (a) from about 15 to about 35% by weight, of methacrylic acid, (b) from about 5 to about 70% by weight, of at least one ester of methacrylic acid represented by the structural formula:
- ##STR4## wherein R is saturated or unsaturated and represents an alkyl group having from 1 to 20 carbon atoms, and (c) from about 5 to about 80% by weight, of at least one vinyl ester of a saturated aliphatic carboxylic acid, wherein the acid has from 1 to 10 carbon atoms.
In a latex paint composition comprising water, pigment, and thickener, the improvement which comprises having as at least a portion of the thickener dissolved therein a polymer prepared from monomers consisting essentially of (a) from about 15 to about 35% by weight, of methacrylic acid, (b) from about 5 to about 70% by weight, of at least one ester of methacrylic acid represented by the structural formula:
- ##STR5## wherein R is saturated or unsaturated and represents an alkyl group having from 1 to 20 carbon atoms, and (c) from about 5 to about 80% by weight, of at least one vinyl ester of a saturated aliphatic carboxylic acid, wherein the acid has from 1 to 10 carbon atoms.
A process for thickening an aqueous composition which comprises:
- (I) adding a polymer to the aqueous composition which polymer is prepared by polymerizing monomers consisting essentially of:
- (a) from about 15 to about 35% by weight, of methacrylic acid, (b) from about 5 to about 70% by weight, of at least one ester of methacrylic acid represented by the structural formula:
- ##STR6## wherein R is saturated or unsaturated and represents an alkyl group having from 1 to 20 carbon atoms, and (c) from about 5 to about 80% by weight, of at least one vinyl ester of a saturated aliphatic carboxylic acid, wherein the acid has from 1 to 10 carbon atoms, and
- (II) dissolving the polymer in the aqueous composition.
In an aqueous composition comprising water and thickener, the improvement which comprises having as at least a portion of the thickener dissolved therein a polymer prepared from monomers consisting essentially of (a) from about 15 to about 35% by weight, of methacrylic acid, (b) from about 5 to about 70% by weight, of at least one ester of methacrylic acid represented by the structural formula:
- ##STR7## wherein R is saturated or unsaturated and represents an alkyl group having from 1 to 20 carbon atoms, and (c) from about 5 to about 80% by weight, of at least one vinyl ester of a saturated aliphatic carboxylic acid, wherein the acid has from 1 to 10 carbon atoms.
Dependencies are inferred from the claim text.