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US4072640A
Expired / Lapsed
US
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Copolymerization of vinyl monomers with cellulose and starch in copper ammonium solutions
Assignee: Instituto Venezolano de Investigaciones Científicas
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Filing: 1976-01-29
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Granted: 1978-02-07
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Expires: 1996-01-29
Abstract
Abstract A process for the production of starch or cellulose copolymers with vinyl monomers by dissolving the starch or cellulose in copper ammonium solution, adding the vinyl monomer and catalyzing with light or heat. Methyl methacrylate can also be homopolymerized by this process.
Inventors
- 👤 Jose M. Sosa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:49
CPC Classifications
C; C08; C08F; C08F251/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
52 words
A process for the copolymerization of starch or cellulose with a vinyl monomer or monomers, comprising: dissolving the starch or cellulose in a copper ammonium solution and adding the vinyl monomer or monomers thereto; catalyzing polymerization with heat or light until the desired polymer is achieved; and recovering the polymer so produced.
Claim 2
Dependent Claim
52 words
A process for the copolymerization of starch or cellulose with a vinyl monomer or monomers, comprising: dissolving the starch or cellulose in a copper ammonium solution and adding the vinyl monomer or monomers thereto; catalyzing polymerization with heat or light until the desired polymer is achieved; and recovering the polymer so produced.
Claim 3
Dependent Claim
15 words
A process in accordance with claim 1 wherein said vinyl monomer or monomers is methylmethacrylate.
Claim 4
Dependent Claim
28 words
A process in accordance with claim 1 wherein said vinyl monomer or monomers is a mixture of two or more of acrylonitrile, acrylic acid, methylmethacrylate or methacrylic acid.
Claim 5
Dependent Claim
19 words
A process in accordance with claim 1 wherein the polymerization is continued for about 4 to about 20 hours.
Claim 6
Dependent Claim
61 words
A process for the homopolymerization of methyl methacrylate, comprising: dissolving starch or cellulose in a copper ammonium solution and adding the methyl methacrylate thereto; catalyzing polymerization with light; and stopping the polymerization reaction after homopolymerization has begun but before copolymerization of the methyl methacrylate with the starch or cellulose begins, said stopping being after between about 30 minutes and 4 hours.
Claim 7
Dependent Claim
61 words
A process for the homopolymerization of methyl methacrylate, comprising: dissolving starch or cellulose in a copper ammonium solution and adding the methyl methacrylate thereto; catalyzing polymerization with light; and stopping the polymerization reaction after homopolymerization has begun but before copolymerization of the methyl methacrylate with the starch or cellulose begins, said stopping being after between about 30 minutes and 4 hours.
Claim 8
Dependent Claim
16 words
A process in accordance with claim 5 wherein said polymerization is stopped after about 4 hours.
Claim 9
Dependent Claim
26 words
A process in accordance with claim 1, wherein said starch or cellulose is dissolved in an amount up to about 2% in said copper ammonium solution.
Claim 10
Dependent Claim
28 words
A process in accordance with claim 1, wherein the weight ratio of vinyl monomer or monomers to starch or cellulose is in the range of 1:1 to 100:1.
Claim 11
Dependent Claim
25 words
A process in accordance with claim 1, wherein said copper ammonium solution comprises about 20-30 grams copper and about 200 grams of ammonia per liter.
Claim 12
Dependent Claim
18 words
A process in accordance with claim 5, wherein said polymerization is stopped after about 30 to 45 minutes.
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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |