US4062857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing acrylonitrile polymer melt
Assignee: Japan Exlan Co Ltd
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Filing: 1976-11-04
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Granted: 1977-12-13
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Expires: 1996-11-04
Abstract
Abstract Process for producing an acrylonitrile polymer in a substantially melted state by polymerizing a monomer mixture composed mainly of acrylonitrile in the presence of water under a pressure above the autogenous pressure at a temperature of from 80° to 120° C so as to attain a polymerization rate of at least 45%.
Inventors
- 👤 Toshiyuki Kobashi
- 👤 Masahiko Ozaki
- 👤 Kenichi Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:30
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
A process for producing an acrylonitrile polymer melt which comprises polymerizing a monomer mixing consisting of 50 - 98 mol percent acrylonitrile and the remainder composed of at least one different ethylenically unsaturated compound in a system in which water is present in a quantity within the range of 3 - 60 weight percent based on the total amount of the monomer mixture and the water, under a pressure above the self-generated pressure, at a temperature of 80° - 120° C., to convert at least 45 weight percent of the monomer mixture to the acrylonitrile polymer.
Claim 2
Dependent Claim
96 words
A process for producing an acrylonitrile polymer melt which comprises polymerizing a monomer mixing consisting of 50 - 98 mol percent acrylonitrile and the remainder composed of at least one different ethylenically unsaturated compound in a system in which water is present in a quantity within the range of 3 - 60 weight percent based on the total amount of the monomer mixture and the water, under a pressure above the self-generated pressure, at a temperature of 80° - 120° C., to convert at least 45 weight percent of the monomer mixture to the acrylonitrile polymer.
Claim 3
Dependent Claim
20 words
A process as claimed in claim 1 wherein the polymerization is conducted at a temperature of 85° - 115° C.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 1 wherein the polymerization is conducted at a temperature of 90° - 110° C.
Claim 5
Dependent Claim
40 words
A process as claimed in claim 1 wherein the polymerization is conducted in a system in which water is present in an amount of 5 - 50% by weight based on the total amount of the monomer mixture and water.
Claim 6
Dependent Claim
40 words
A process as claimed in claim 1 wherein the polymerization is conducted in a system in which water is present in an amount of 10 - 35% by weight based on the total amount of the monomer mixture and water.
Claim 7
Dependent Claim
21 words
A process as claimed in claim 1 wherein the content of acrylonitrile in the monomer mixture is above 80 mol %.
Claim 8
Dependent Claim
22 words
A process as claimed in claim 1 wherein more than 50% by weight of the monomer mixture is converted into the polymer.
Claim 9
Dependent Claim
24 words
A process as claimed in claim 1 wherein about 55 to about 97% by weight of the monomer mixture is converted into the polymer.
Claim 10
Dependent Claim
20 words
A process as claimed in claim 1 which further comprises heating the acrylonitrile polymer melt at 130° - 250° C.
Claim 11
Dependent Claim
39 words
A process as claimed in claim 1 wherein the polymer melt is prepared in a reactor and is directly extruded into a zone characterized by lower temperature and lower pressure than in the reactor, to form fibers or films.
References Cited (Backward Citations)
US3701761A
Cited
US3873508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |