# US 3,931,089 A · Acid compositions comprised of polymeric 2-acrylamido-2-methylpropanesulfonic acid as thickener

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- Number: US 3,931,089 A
- Document ID: US3931089A
- Status: Granted
- Kind: A
- Application number: 05/476,975
- Filed: 1974-06-06
- Granted: 1976-01-06
- Earliest claimed: 1974-06-06
- Assignees: General Mills Chemicals, Inc.
- Inventors: Curtis Lee Karl
- Web page: https://patentgrep.com/patent/US3931089A

## CPC

- C23G 1/025: {acidic pickling pastes}
- B01J 19/06: Solidifying liquids (making microcapsules B01J13/02)
- C09K 8/74: combined with additives added for specific purposes
- C11D 3/0047: {pH regulated compositions}
- C11D 3/3773: {in liquid compositions}
- C11D 7/08: Acids
- Y10S 507/933: Acidizing or formation destroying
- C23G: CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Acid solutions having pH values of about 2 or below and containing a homopolymer of 2-acrylamido-2-methylpropanesulfonic acid or a salt of the homopolymer.

## Claims

### Claim 1

A composition of matter comprising water in an amount of at least 25% by weight of the composition, an acid selected from the mineral acids, the water soluble carboxylic acids containing one to four carbon atoms and mixtures thereof in an amount to produce a pH level of about 2 or below, and a thickener selected from a homopolymer and the alkali and alkaline earth metal salts of the homopolymer of 2-acrylamido-2-methylpropanesulfonic acid in an amount of about 0.05% to 5.0% by weight of the composition.

### Claim 2 (depends on 1)

The composition of claim 1 wherein an alcohol containing two to three carbon atoms is included in an amount of about 5% to 10% by weight of the composition.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the thickener is included in amounts of about 1% to 4% by weight of the composition.

### Claim 4 (depends on 1)

The composition of claim 1 wherein the thickener is the homopolymer of 2-acrylamido-2-methylpropanesulfonic acid in an amount of about 1% to 4% by weight of the composition.