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Patent US4526945A successfully refreshed from Google Patents.
US4526945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low molecular weight polymers and copolymers
Assignee: Akzo Nobel Paints LLC
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Filing: 1984-03-21
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Granted: 1985-07-02
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Expires: 2004-03-21
Abstract
Abstract The process comprises polymerizing monomers, especially including methacrylic monomer, in the presence of azo catalyst and between 0.0001% and 0.01% of Cobalt (II) dimethylglyoxime pyridine or similar Cobalt (II) complexes to produce a low molecular weight polymer or copolymer.
Inventors
- 👤 Gary M. Carlson
- 👤 Kirk J. Abbey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:44
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A process for producing a low molecular weight methacrylic polymer comprising: copolymerizing ethylenically unsaturated monomers comprising a methacrylic monomer alone or a methacrylic monomer and other ethylenic monomer in the presence of an effective amount of free radical catalyst in combination with between 0.0001% and 0.01% Cobalt (II) glyoxime catalyst comprising a Cobalt (II) glyoxime modified by a basic ligand selected from the group consisting of pyridine, triphenylphosphine or imidazole derivatives based on the weight of said ethylenically unsaturated monomer to produce a low molecular weight methacrylate polymer having a number average molecular weight between about 500 and 20,000.
Claim 2
Dependent Claim
99 words
A process for producing a low molecular weight methacrylic polymer comprising: copolymerizing ethylenically unsaturated monomers comprising a methacrylic monomer alone or a methacrylic monomer and other ethylenic monomer in the presence of an effective amount of free radical catalyst in combination with between 0.0001% and 0.01% Cobalt (II) glyoxime catalyst comprising a Cobalt (II) glyoxime modified by a basic ligand selected from the group consisting of pyridine, triphenylphosphine or imidazole derivatives based on the weight of said ethylenically unsaturated monomer to produce a low molecular weight methacrylate polymer having a number average molecular weight between about 500 and 20,000.
Claim 3
Dependent Claim
14 words
The process in claim 1 wherein the Cobalt(II) catalyst is a Cobalt(II) dimethylglyoxime pyridine.
Claim 4
Dependent Claim
15 words
The process in claim 1 wherein the Cobalt(II) catalyst is a Cobalt(II) dialkyl glyoxime pyridine.
Claim 5
Dependent Claim
12 words
The process in claim 1 wherein the methacrylic monomer is methacrylic acid.
Claim 6
Dependent Claim
12 words
The process in claim 1 where the methacrylic monomer comprises methyl methacrylate.
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 |