US4698161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer blend for dispersion of particulate materials in aqueous systems
Assignee: Pony Industries Inc
•
Filing: 1985-12-23
•
Granted: 1987-10-06
•
Expires: 2005-12-23
Abstract
Abstract Particulate materials in aqueous media such as heat exchange systems are dispersed by introducing into the system a polymer blend comprising about 50 to 99% by weight of (A) a water-soluble, dissociating, low molecular weight polymer of at least one alpha, beta-monoethylenically unsaturated carboxylic acid, and about 50 to 1% by weight of (B) a water-soluble, dissociating, lower molecular weight polymer selected from (1) vinyl aromatic polymers and (2) polymers of 2-acrylamido-2-methylpropanesulfonic acid. A typical polymer blend comprises, in neutralized form, (A) polyacrylic acid terminated with thioglycolic acid and (B) a polymer of sulfonated styrene and maleic anhydride.
Inventors
- 👤 Gerald D. Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:39
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
A method of dispersing particulate materials in an aqueous medium, which comprises introducing into the medium an amount effective to disperse said materials of a polymer blend consisting essentially of about 50 to 90% by weight of (A) a polyacrylic acid terminated by thioglycolic, bisulfite, or mercapto groups and about 50 to 1% by weight of (B) a water-soluble, dissociating low molecular weight polymer selected from the group consisting of (1) vinyl aromatic polymers and (2) polymers of 2-acrylamido-2-methylpropane sulfonic acid.
Claim 2
Independent Claim
81 words
A method of dispersing particulate materials in an aqueous medium, which comprises introducing into the medium an amount effective to disperse said materials of a polymer blend consisting essentially of about 50 to 90% by weight of (A) a polyacrylic acid terminated by thioglycolic, bisulfite, or mercapto groups and about 50 to 1% by weight of (B) a water-soluble, dissociating low molecular weight polymer selected from the group consisting of (1) vinyl aromatic polymers and (2) polymers of 2-acrylamido-2-methylpropane sulfonic acid.
Claim 3
Dependent Claim
73 words
The method of claim 1 wherein the vinyl aromatic polymers (1) are selected from the group consisting of hydrolyzable styrene/maleic anhydride copolymer, hydrolyzable sulfonated styrene/maleic anhydride copolymer, hydrolyzable styrene/maleimide copolymer, hydrolyzable sulfonated styrene/maleimide copolymer, sulfonated polystyrene, and copolymers of sulfonated styrene and divinyl benezene, and polymers (2) are selected from the group consisting of homopolymers of 2-acrylamido-2-methylpropane sulfonic acid and copolymers of 2 acrylamido-2-methylpropane sulfonic acid and at least one water soluble comonomer.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein the amount of polymer (A) is about 70 to 95% by weight and the amount of polymer (B) is about 30 to 5% by weight.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein polymer (B) is a hydrolyzable polymer of sulfonated styrene and maleic anhydride.
Claim 6
Dependent Claim
31 words
The method of claim 4 wherein the amount of polymer (A) is about 70 to 95% by weight and the amount of polymer (B) is about 30 to 5% by weight.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the number average molecular weight of polymers (A) and (B) is about 500 to 5000.
References Cited (Backward Citations)
US4384979A
Cited
US4374733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |