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US3687918A Expired / Lapsed US ⏱️ 0.0 years remaining

Acrylonitrile polymerization

Assignee: Celanese Corp
•
Filing: 1969-06-16
•
Granted: 1972-08-29
•
Expires: 1989-06-16
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Abstract

Abstract A method of polymerizing acrylonitrile polymers at elevated temperatures and superatmospheric pressure conditions in a novel organic, preferably aqueous-organic, reaction medium in which the monomeric reactants and the polymerized acrylonitrile are soluble under the polymerization conditions. The polymerization conditions may correspond to or are conveniently changed to polymer shaping conditions utilizing the same solvent-reaction medium, thus eliminating polymer recovery, polymer washing, polymer dissolution and the like, process steps. The organic polymerization medium is a monomer and polymer solvating amount of acetonitrile, generally in an amount of 60 to 100 percent by weight of the solvent solution with the residual amount being preferably water. The process is particularly suitable for continuous reaction and polymer shaping wherein an effluent solution of polymer and organic or aqueous-organic reaction medium is continuously withdrawn from the reaction system, maintained under solubilizing conditions of heat and superatmospheric pressure, with suitable adjustment of solvent concentrations as desired to provide homogeneous polymer suitable for extrusion into a shaped article.

Inventors

  • 👤 Gordon W Calundann

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 16:32
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; Y; Y10; Y10S; Y10S260/00; Y10S260/28

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 10 words
The process of claim 1 wherein said lower-alkylnitrile is acetonitrile.
Claim 2
Dependent Claim 18 words
The process of claim 2 wherein the acetonitrile solvent contains up to about 40 weight percent of water.
Claim 3
Dependent Claim 21 words
The process of claim 2 wherein the solvent comprises an acetonitrile/water mixture of 60/40 to 98/2 percent by weight acetonitrile/water, respectively.
Claim 4
Dependent Claim 30 words
The process of claim 2 wherein the polymerization reaction residence time and temperature employed are sufficient to produce an acrylonitrile polymer having an inherent viscosity of at least about 0.4.
Claim 5
Dependent Claim 21 words
The method of claim 2 wherein the superatmospheric pressure is sufficient to substantially retain the polymerization system in the liquid phase.
Claim 6
Dependent Claim 21 words
The method of claim 6 wherein the superatmospheric pressure is about equal to the vapor pressure produced by the polymerization system.
Claim 7
Dependent Claim 20 words
The method of claim 6 wherein the superatmospheric pressure is produced autogeneously by heating the mixture in a sealed system.
Claim 8
Dependent Claim 23 words
The process of claim 1 wherein the acrylonitrile polymer is a fiber-forming polymer and the homogeneous polymer solution is spun into a fiber.
Claim 9
Dependent Claim 21 words
The process of claim 9 wherein the polymerization, solvation and spinning into a fiber is operated as a continuous integrated process.
Claim 10
Dependent Claim 12 words
The process of claim 1 wherein the copolymerizable monomer is methyl acrylate.
Claim 11
Dependent Claim 31 words
The process of claim 2 wherein the acrylonitrile monomer is copolymerized with another ethylenically unsaturated sulfonic group containing monomer in an amount of 0.1 to 5 weight percent of the polymer.
Claim 12
Dependent Claim 14 words
The process of claim 9 wherein said solution is dry spun into a fiber.
Claim 13
Dependent Claim 14 words
The method of claim 2 wherein the temperature is about 80* to 170* C.
Claim 14
Dependent Claim 16 words
The method of claim 4 wherein said acetonitrile/water solvent contains about 18 to 27 percent water.

References Cited (Backward Citations)

US3053806A Cited
US3375237A Cited
US3449286A Cited
US3395133A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-08-29 1976-02-28 1976-08-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-08-29 1980-02-28 1980-08-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-08-29 1984-02-28 1984-08-29 $7700.00 Window Closed / Lapsed

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