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US 4,167,502 AGranted
Carboxylic polymeric thickeners
AssigneeRohm and Haas Company
InventorsSheldon N. Lewis, John J. Miller
Life of this patent
Estimating the term…
Abstract
Polymers of a polymerizable mixture comprising an ethylenically unsaturated acid and an oligomer of an allyl-containing ester of acrylic acid or methacrylic acid are useful as thickening and bodying agents when partially or completely neutralized.
Claims12
A method of thickening a liquid composition which comprises dissolving in the composition a solid polymer of a polymerizable mixture comprising:
- (A) at least about 30% by weight, of the polymer, of a monoethylenically .alpha.,.beta.-unsaturated carboxylic acid selected from acrylic acid, methacrylic acid, ethacrylic acid, .alpha.-chloroacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid and mixtures of same, and (B) an oligomer having a number average molecular weight of from about 400 to about 10,000, wherein the oligomer is an unhydrolyzed or partially-hydrolyzed anionically-polymerized oligomer of allyl methacrylic or a (C.sub.3 -C.sub.7)allyloxyalkyl methacrylate;
- wherein the average chain length of the oligomer, n, is about 6 to about 50 mers and at least about 85% of the molecules have chain lengths of about .sqroot.2n to about 2n mers and wherein the oligomer comprises about 0.1% to about 10% by weight of the mixture;
- in an amount effective to cause thickening.
A method of thickening a liquid composition which comprises dissolving in the composition a solid polymer of a polymerizable mixture comprising:
- (A) at least about 30% by weight, of the polymer, of a monoethylenically .alpha.,.beta.-unsaturated carboxylic acid selected from acrylic acid, methacrylic acid, ethacrylic acid, .alpha.-chloroacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid and mixtures of same, and (B) an oligomer having a number average molecular weight of from about 400 to about 10,000, wherein the oligomer is an unhydrolyzed or partially-hydrolyzed oligomer of allyl acrylate or a (C.sub.3 -C.sub.7)allyloxyalkyl acrylate;
- wherein the average chain length of the oligomer, n, is about 6 to about 30 mers and at least about 80% by weight consists of molecules having chain lengths of about n/3 to about 3.3 n mers and wherein the oligomer comprises about 0.1% to about 10% by weight of the mixture;
- in an amount effective to cause thickening.
Dependencies are inferred from the claim text.