US3843578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solutions of n-vinyl pyrrolidone copolymers
Assignee: Bayer AG
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Filing: 1972-08-17
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Granted: 1974-10-22
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Expires: 1992-08-17
Abstract
Abstract The object of the invention are solutions of copolymers from Nvinylpyrrolidone and methylacrylate and/or acrylonitrile which are prepared by polymerizing the monomers in solvents for acrylonitrile polymers p.i. in dimethyl formamide in the presence of an catalyst system comprising a peroxide and a sulfinic acid. The solutions are used as additives for spinning solutions containing acrylonitrile polymers.
Inventors
- 👤 H Logemann
- 👤 C Suling
- 👤 G Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:46
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
181 words
A PROCES FOR THE SOLUTION POLYMERIZATION OF A MONOMER MIXTURE OF FROM 10 TO 99 PERCENT BY WEIGHT OF N-VINYL PYRROLIDONE AND FROM 1 TO 90 PERCENT BY WEIGHT OF METHYLACRYLATE AND OR ACRYLONITRILE WHICH COMPRISES POLYMERIZING SOLUTIONS CONTAINING FROM 5 TO 50 PERCENT BY WEIGHT OF SAID MONOMER MIXTURE IN A SOLVENT WHICH IS A SOLVENT FOR HOMOPOLYMERS OF ACRYLONITRILE OR FOR COPOLYMERS OF ACRYLONITRILE WITH VINYLIDENE CHLORIDE AND OR VINYL CHLORIDE, AT A TEMPERATURE BELOW 80*C IN THE PRESENCE OF A CATALYST SYSTEM COMPRISING FROM 0.1 TO 3 PERCENT BY WEIGHT, BASED ON THE QUANTITY OF MONOMERS TO BE POYMERIZED OF AN ORGANIC PEROXIDE SELECTED FROM THE GROUP CONSISTING OF BENZOYL PEROXIDE P-CHLORO BENZOYL PEROXIDE PERACETIC ACID, TERT-BUTYL HYDROPEROXIDE, MENTHANE HYDROPEROXIDE OXIDE, TERT-BUTYL PERBENZOATE PEROCTOATE PERPIVALATE DIISOPROPYL BENZENE HYDROPEROXIDE, MENTHANE HYDROPEROXIDE PERMALEIC ACID, ACETYL CYCLO HEXYL SULFONYL PEROXIDE AND DICYCLO HEXY PERCARBONATE, AND ALSO FROM 0.1 TO 3 MOLS BASED ON THE PEROXIDE OF AN AROMAIC SULPHINIC ACID SELECTED FROM THE GROUP CONSISTING OF BENZENE AND P-TOLUENE SULPHINIC ACID AND THE HOMOLOGUEW AND SUBSTITUTION PRODUCTS OF BENZENE SULPHINIC ACID.
Claim 2
Dependent Claim
181 words
A PROCES FOR THE SOLUTION POLYMERIZATION OF A MONOMER MIXTURE OF FROM 10 TO 99 PERCENT BY WEIGHT OF N-VINYL PYRROLIDONE AND FROM 1 TO 90 PERCENT BY WEIGHT OF METHYLACRYLATE AND OR ACRYLONITRILE WHICH COMPRISES POLYMERIZING SOLUTIONS CONTAINING FROM 5 TO 50 PERCENT BY WEIGHT OF SAID MONOMER MIXTURE IN A SOLVENT WHICH IS A SOLVENT FOR HOMOPOLYMERS OF ACRYLONITRILE OR FOR COPOLYMERS OF ACRYLONITRILE WITH VINYLIDENE CHLORIDE AND OR VINYL CHLORIDE, AT A TEMPERATURE BELOW 80*C IN THE PRESENCE OF A CATALYST SYSTEM COMPRISING FROM 0.1 TO 3 PERCENT BY WEIGHT, BASED ON THE QUANTITY OF MONOMERS TO BE POYMERIZED OF AN ORGANIC PEROXIDE SELECTED FROM THE GROUP CONSISTING OF BENZOYL PEROXIDE P-CHLORO BENZOYL PEROXIDE PERACETIC ACID, TERT-BUTYL HYDROPEROXIDE, MENTHANE HYDROPEROXIDE OXIDE, TERT-BUTYL PERBENZOATE PEROCTOATE PERPIVALATE DIISOPROPYL BENZENE HYDROPEROXIDE, MENTHANE HYDROPEROXIDE PERMALEIC ACID, ACETYL CYCLO HEXYL SULFONYL PEROXIDE AND DICYCLO HEXY PERCARBONATE, AND ALSO FROM 0.1 TO 3 MOLS BASED ON THE PEROXIDE OF AN AROMAIC SULPHINIC ACID SELECTED FROM THE GROUP CONSISTING OF BENZENE AND P-TOLUENE SULPHINIC ACID AND THE HOMOLOGUEW AND SUBSTITUTION PRODUCTS OF BENZENE SULPHINIC ACID.
Claim 3
Dependent Claim
31 words
A process as claimed in claim 1 in which the solvent additionally contains from 0.2 to 2 percent of water or an aliphatic alcohol with from 1 to 4 carbon atoms.
Claim 4
Dependent Claim
33 words
A process as claimed in claim 1, in which the solvent for polyacrylonitrile is dimethyl formamide, dimethyl acetamide, ethylene carbonate, gamma -butyrolactone, dimethyl sulphoxide or an aqueous zinc chloride or sodium thiocyanate solution.
Claim 5
Dependent Claim
27 words
A process as claimed in claim 1, in which the solvent for a copolymer of acrylonitrile with vinylidene chloride and/or vinyl chloride is acetone, cyclohexane or tetrahydrofuran.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 1, in which the polymerisation is carried out at a temperature of from +10* to +40*C.
Claim 7
Dependent Claim
62 words
A process as claimed in claim 1, in which the polymerisation is carried out in the presence of from 0.5 to 1.5 percent by weight, based on the quantity of monomer to be polymerised, of the organic peroxide or of the hydrogen peroxide and in the presence of from 0.2 to 0.5 mols, based on the peroxide, of the aromatic sulphinic acid.
Claim 8
Dependent Claim
15 words
A process as claimed in claim 1, in which the organic hydroperoxide is tert.-butyl hydroperoxide.
Claim 9
Dependent Claim
21 words
A process as claimed in claim 1, in which the aromatic sulphinic acid is benzene sulphinic acid or toluene sulphinic acid.
Claim 10
Dependent Claim
42 words
A process as claimed in claim 1, in which the catalyst system comprises from 0.1 to 3 percent by weight, based on the monomers used, of tert.-butyl hydroperoxide together with 0.1 to 3 percent by weight of benzene or p-toluene sulphinic acid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |