US4604431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical modification of (meth)acrylic acid homopolymers and alkyl (meth)acrylate polymers in aqueous systems with amino sulfonic acids
Assignee: Ecolab USA Inc
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Filing: 1985-11-22
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Granted: 1986-08-05
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Expires: 2005-11-22
Abstract
Abstract The invention comprises a method of preparing copolymers of acrylamido sulfonic acids which comprises converting to acrylamido sulfonic groups at least 5 mole % of the acrylic acid or methacrylic acid groups in a polymer which contains at least 5 mole % of these monomers in its structures by reacting an aqueous solution of the acrylic acid or methacrylic acid polymer with an amino sulfonic acid under pressure at a temperature of at least 70° C. for a period of time sufficient to convert at least 5 mole % of the acrylic acid or methacrylic acid groups in the polymer to amido sulfonic acid groups corresponding to the starting amino sulfonic acid.
Inventors
- 👤 Dodd W. Fong
- 👤 Claudia C. Pierce
- 👤 David A. Grattan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:07
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A method of preparing copolymers of acrylamido sulfonic acids which comprises converting to acrylamido sulfonic groups at least 5 mole % of the acrylic acid or methacrylic acid groups in a polymer which contains at least 5 mole % of these monomers in its structure which comprises reacting an aqueous solution of the acrylic acid or methacrylic acid polymer with an amino sulfonic acid from the group consisting of the lower alkyl, aryl and aryalkyl sulfonic acids, under pressure at a temperature of at least 70° C. for a period of time sufficient to convert at least 5 mole % of the acrylic acid or methacrylic acid groups in the polymer to amido lower alkyl, aryl or arylalkyl sulfonic acid groups.
Claim 2
Independent Claim
121 words
A method of preparing copolymers of acrylamido sulfonic acids which comprises converting to acrylamido sulfonic groups at least 5 mole % of the acrylic acid or methacrylic acid groups in a polymer which contains at least 5 mole % of these monomers in its structure which comprises reacting an aqueous solution of the acrylic acid or methacrylic acid polymer with an amino sulfonic acid from the group consisting of the lower alkyl, aryl and aryalkyl sulfonic acids, under pressure at a temperature of at least 70° C. for a period of time sufficient to convert at least 5 mole % of the acrylic acid or methacrylic acid groups in the polymer to amido lower alkyl, aryl or arylalkyl sulfonic acid groups.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the acrylic acid or methacrylic acid polymer is a homopolymer and the amino sulphonic acid contains not more than 12 carbon atoms.
Claim 4
Dependent Claim
12 words
The method of claim 2 where the amino sulphonic acid is taurine.
Claim 5
Dependent Claim
15 words
The method of claim 2 where the amino sulphonic acid is amino-2-hydroxy propane sulfonic acid.
Claim 6
Dependent Claim
13 words
The method of claim 2 where the amino sulphonic acid is sulfanilic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |