US5055540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for efficient molecular weight control in copolymerization
Assignee: Rohm and Haas Co
•
Filing: 1990-02-06
•
Granted: 1991-10-08
•
Expires: 2010-02-06
Abstract
Abstract This invention relates to copolymers containing as copolymerized monomer units aliphatic monoethylenically unsaturated dicarboxylic acids such as maleic acid, monoethylenically unsaturated monocarboxylic acids such as acrylic acid and carboxyl-free monoethylenically unsaturated monomers such as alkyl esters of acrylic acid. This invention particularly relates to the use of low levels of copper ions in an aqueous polymerization process to promote copolymerization of the above-mentioned monomers at high conversion while maintaining and improving molecular weight control. These copolymers are useful primarily as antiscalants, dispersants, hard surface cleaners, detergent builders and incrustation inhibitors.
Inventors
- 👤 Kathleen A. Hughes
- 👤 Graham Swift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:59
CPC Classifications
C; C08; C08F; C08F210/00; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C08F220/00; C08F220/02; C08F220/04; C08F222/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A water soluble low molecular weight copolymer formed by polymerizing monomer units consisting essentially of a) at least one monoethylenically unsaturated dicarboxylic acid at a concentration of from 3 percent to 25 percent by weight on the total polymerizable monomer units, b) at least one monoethylenically unsaturated monocarboxylic acid at a concentration of from 75 percent to 95 percent by weight on the total polymerizable monomer units and c) optionally, one or more carboxyl-free monoethylenically unsaturated monomer, such that the sum of the weight percentages of a, b and c equals 100 and, wherein the weight average molecular weight of the copolymer is less than 25,000.
Claim 2
Dependent Claim
106 words
A water soluble low molecular weight copolymer formed by polymerizing monomer units consisting essentially of a) at least one monoethylenically unsaturated dicarboxylic acid at a concentration of from 3 percent to 25 percent by weight on the total polymerizable monomer units, b) at least one monoethylenically unsaturated monocarboxylic acid at a concentration of from 75 percent to 95 percent by weight on the total polymerizable monomer units and c) optionally, one or more carboxyl-free monoethylenically unsaturated monomer, such that the sum of the weight percentages of a, b and c equals 100 and, wherein the weight average molecular weight of the copolymer is less than 25,000.
Claim 3
Dependent Claim
28 words
The water soluble low molecular weight copolymer of claim 1 wherein said monoethylenically unsaturated dicarboxylic acid is maleic acid and said monoethylenically unsaturated monocarboxylic acid is acrylic acid.
Claim 4
Dependent Claim
85 words
A detergent composition containing the copolymer of claim 1 comprising a water soluble detergent compound selected from the group consisting of anionic, nonionic, zwitterionic, ampholytic detergent compounds and mixtures thereof; a builder selected from the group consisting of the alkali metal salts of carboxymethyloxysuccinic acid and oxydiacetic acid, tetrasodium and tetrapotassium pyrophosphate, pentasodium and pentapotassium tripolyphosphates, ether polycarboxylates, citrates, starch or cellulose derived from polycarboxylates, polyacrylic acids and the like; optional adjuvants; and up to about 35% by weight of the copolymer of claim 1.
Claim 5
Dependent Claim
22 words
The detergent composition of claim 3 wherein the level of the copolymer of claim 1 is from 0.1 to 20% by weight.
Claim 6
Dependent Claim
22 words
The detergent composition of claim 3 wherein the level of the copolymer of claim 1 is from 0.5 to 5.0% by weight.
References Cited (Backward Citations)
US4857622A
Cited
US4485223A
Cited
EP0097495A1
Cited
US4725655A
Cited
US4647396A
Cited
US4659793A
Cited
DE3716544A1
Cited
US4897220A
Cited
US4897215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-07 | 1995-04-08 | 1995-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-07 | 1999-04-08 | 1999-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-07 | 2003-04-08 | 2003-10-08 | $7700.00 | Window Closed / Lapsed |