Patent US4446291A successfully refreshed from Google Patents.
US4446291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous production of acrylonitrile-vinyl chloride copolymers
Assignee: Bayer AG
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Filing: 1977-07-25
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Granted: 1984-05-01
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Expires: 1997-07-25
Abstract
Abstract The invention relates to a process for the continuous production of a chemically uniform copolymer comprising 15 to 50% by weight of acrylonitrile and from 85 to 50% by weight of vinyl chloride and, optionally, up to 4% by weight of at least one other copolymerized ethylenically unsaturated comonomer containing acid groups by emulsion polymerization, wherein the copolymerization reaction is carried out with a monomer ratio of acrylonitrile to vinyl chloride of from 0.02 to 0.5, in the presence of a redox catalyst and in an acidic medium.
Inventors
- 👤 Joachim Konig
- 👤 Karl-Erwin Schnalke
- 👤 Carlhans Suling
- 👤 Horacek: Gotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:10
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
136 words
A process for the continuous production of a chemically uniform copolymer having improved spinning properties comprising from 15 to 50% by weight of acrylonitrile and from 85 to 50% by weight of vinyl chloride and, optionally, up to 4% by weight of at least one other copolymerised ethylenically unsaturated comonomer containing acid groups by emulsion polymerisation, wherein the copolymerisation reaction is carried out with a monomer ratio of acrylonitrile to vinyl chloride of from 0.02 to 0.5 (ratio by weight), in the presence of a redox catalyst of compounds of sulphurous acid and peroxodisulphates in a molar ratio of reducing to oxidising component of from 8:1 to 100:1 and at a pH-value of from 2.5 to 4 wherein the total concentration of redox catalyst amounts to between 0.5 and 4% by weight, based on total monomer.
Claim 2
Dependent Claim
136 words
A process for the continuous production of a chemically uniform copolymer having improved spinning properties comprising from 15 to 50% by weight of acrylonitrile and from 85 to 50% by weight of vinyl chloride and, optionally, up to 4% by weight of at least one other copolymerised ethylenically unsaturated comonomer containing acid groups by emulsion polymerisation, wherein the copolymerisation reaction is carried out with a monomer ratio of acrylonitrile to vinyl chloride of from 0.02 to 0.5 (ratio by weight), in the presence of a redox catalyst of compounds of sulphurous acid and peroxodisulphates in a molar ratio of reducing to oxidising component of from 8:1 to 100:1 and at a pH-value of from 2.5 to 4 wherein the total concentration of redox catalyst amounts to between 0.5 and 4% by weight, based on total monomer.
Claim 3
Dependent Claim
21 words
The process of claim 1, wherein the polymerisation reaction is carried out in the presence of at least one anion-active emulsifier.
Claim 4
Dependent Claim
25 words
The process of claim 2, wherein the total concentration of said anion-active emulsifier amounts to between 0.75 and 8% by weight, based on total monomer.
Claim 5
Dependent Claim
13 words
The process of claim 2, wherein said anion-active emulsifier is sodium lauryl sulphate.
Claim 6
Dependent Claim
22 words
The process of claim 1, wherein the polymerisation reaction is carried out in the presence of an anion-active and a non-ionic emulsifier.
Claim 7
Dependent Claim
13 words
The process of claim 5, wherein said non-ionic emulsifier is a polyglycol ether.
Claim 8
Dependent Claim
28 words
The process of claim 5, wherein the total concentration of said anion-active and said non-ionic emulsifier amounts to between 0.75 and 8% by weight, based on total monomer.
Claim 9
Dependent Claim
23 words
The process of claim 5, wherein the ratio by weight of said anion-active to said non-ionic emulsifier amounts to between 10:1 and 1.5:1.
Claim 10
Dependent Claim
21 words
The process of claim 1, wherein the polymerisation reaction is carried out at a temperature of from 10° to 50° C.
Claim 11
Dependent Claim
22 words
The process of claim 1, wherein the polymerisation reaction is carried out in a cascade of several pressure-resistant and corrosion-resistant stirrer-equipped vessels.
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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |