US4458005A
Expired / Lapsed
US
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Polyvinylmethylphosphinic acid, process for its manufacture and use
Assignee: Hoechst AG
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Filing: 1982-06-23
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Granted: 1984-07-03
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Expires: 2002-06-23
Abstract
Abstract The invention relates to a new phosphorus-containing polymer, polyvinylmethylphosphinic acid. It is prepared by polymerization, preferably catalytic, of vinylmethylphosphinic acid or a salt thereof. The new polymer possesses valuable properties and is used, in particular, in the production of offset printing plates which have a light-sensitive layer.
Inventors
- 👤 Dieter Mohr
- 👤 Walter Herwig
- 👤 Werner Frass
- 👤 Gerhard Usbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:15
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/038; B41N3/036; C; C08; C08F; C08F230/00; C08F230/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
7 words
A polymer material comprised of polyvinylmethylphosphinic acid.
Claim 2
Dependent Claim
7 words
A polymer material comprised of polyvinylmethylphosphinic acid.
Claim 3
Dependent Claim
30 words
A polymer material as defined in claim 1, having a melting point between about 240° C. and 245° C. and a reduced specific viscosity between about 3.5 and 5 ml/g.
Claim 4
Dependent Claim
30 words
A polymer material as defined in claim 1, wherein a 5% solution of the polymer in a 10% sodium chloride solution at 25° C. has a relative viscosity of 5.8.
Claim 5
Dependent Claim
33 words
A process for the preparation of polyvinylmethylphosphinic acid, comprising the step of polymerizing monomeric vinylmethylphosphinic acid, and/or a salt thereof, having the formula ##STR2## in which X denotes hydrogen or an alkali metal.
Claim 6
Dependent Claim
33 words
A process for the preparation of polyvinylmethylphosphinic acid, comprising the step of polymerizing monomeric vinylmethylphosphinic acid, and/or a salt thereof, having the formula ##STR2## in which X denotes hydrogen or an alkali metal.
Claim 7
Dependent Claim
19 words
A process as defined in claim 4, wherein said polymerization is carried out in an inert diluent or solvent.
Claim 8
Dependent Claim
23 words
A process as defined in claim 5, wherein an anhydrous organic solvent comprising an aprotic, polar organic solvent is used for the polymerization.
Claim 9
Dependent Claim
21 words
A process as defined in claim 4, wherein said polymerization is carried out in the presence of a free radical-generating catalyst.
Claim 10
Dependent Claim
19 words
A process as defined in claim 4, wherein said polymerization is carried out under the application of ultraviolet radiation.
Claim 11
Dependent Claim
23 words
A process as defined in claim 4, wherein said polymerization is carried out at a temperature between about -10° C. and 350° C.
Claim 12
Dependent Claim
25 words
A process as defined in claim 7 or 8, wherein said polymerization is carried out at a temperature between about 5° C. and 130° C.
Claim 13
Dependent Claim
29 words
A lithographic printing plate comprised of a layer support, at least one hydrophilic layer comprising polyvinylmethylphosphinic acid and at least one radiation-sensitive reproduction layer applied to said hydrophilic layer(s).
Claim 14
Dependent Claim
29 words
A lithographic printing plate comprised of a layer support, at least one hydrophilic layer comprising polyvinylmethylphosphinic acid and at least one radiation-sensitive reproduction layer applied to said hydrophilic layer(s).
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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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |