US4526728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-Acrylamido- and 2-methacrylamido-2-methyl propanephosphonic acids and their salts, process for the preparation thereof, and use thereof for the manufacture of copolymers
Assignee: Hoechst AG
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Filing: 1984-04-05
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Granted: 1985-07-02
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Expires: 2004-04-05
Abstract
Abstract 2-(Meth)acrylamido-2-methylpropanephosphonic acid is prepared by reaction of 2-methylprop-1-ene-1-phosphonic acid or 2-methylpro-2-ene-1-phosphonic acid with (meth)acrylonitrile in the presence of an equimolar amount of a strong acid. The compounds are suitable as such or in the form of their salts as comonomer for the manufacture of copolymers, which are used inter alia as dyeing auxiliaries and as scale inhibitors.
Inventors
- 👤 Manfred Finke
- 👤 Walter Rupp
- 👤 Erwin Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:03
CPC Classifications
C; C08; C08F; C08F30/00; C08F30/02; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
Acrylamido- and Methacrylamido-2-methylpropanephosphonic acids of the formula ##STR3## and the salts thereof wherein R is hydrogen or methyl.
Claim 2
Dependent Claim
18 words
Acrylamido- and Methacrylamido-2-methylpropanephosphonic acids of the formula ##STR3## and the salts thereof wherein R is hydrogen or methyl.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |