 Electrochemical cell having cylindrical electrode elements |
| In accordance with the present invention, an electrochemical cell is provided that includes an ... |
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| Electrochemical cell having wound electrode structures |
| As an aspect of the invention, an electrical cell which has two electrode structures wound into a ... |
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| Anode coating for lithium cell |
| OF THE ILLUSTRATED EMBODIMENTS Referring now to FIGS. 1-3, there is shown an alkali metal/halogen ... |
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| Process and apparatus for supplying air to a fuel cell system |
| OF THE DRAWING The fuel cell system, identified generally by reference numeral 1, has a fuel cell 1... |
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| Hermetically sealed galvanic cell |
| It is therefore an object of the present invention to provide a sealing member with a predetermined ... |
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| Process for improving lithium ion cell |
| In practicing the process of this invention, a passivating layer, which is the solid-electrolyte ... |
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| Electrical connector |
| According to the principal aspect of the present invention, there is provided an electrical ... |
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| Combined smoke detection and furnace shut off device |
| OF THE PREFERRED EMBODIMENT As shown somewhat schematically in FIG. 1, the system of the present ... |
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| Electrical cut-off device |
| We claim: 1. An electrical cut-out device for electrically connecting a pair of power lines ... |
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| Protection circuit for electrical appliance |
| Accordingly, an object of the invention is to simplify electrical protection circuits, reduce ... |
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Crosslinked acrylonitrile copolymers
| Details |
Inventors: Radlmann, Eduard; Reinehr, Ulrich; Hoffmann, Peter; Arlt, Dieter; Nischk, Gunther;
Assignee: Bayer Aktiengesellschaft (Leverkusen, DE)
Primary Examiner: Woo; Jay H.
Assistant Examiner:
Attorney, Agent or Firm: Plumley & Tyner
The invention relates to a process for the production of crosslinked fibres or filaments by spinning an acrylonitrile copolymer containing at least 20 mVal of carboxyl groups per kg of polymer together with a polyoxazoline in a polar organic solvent and thereafter crosslinking at temperatures of from 120 to 190.degree. C. The invention also relates to crosslinked acrylonitrile fibres and filaments obtainable by this process. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A process for the production of crosslinked acrylonitrile copolymer filaments or fibres, which comprises dissolving an acrylonitrile copolymer containing at least 20 mVal of carboxyl groups per kg of polymer together with at least one polyoxazoline, in a polar organic solvent at a temperature of from 20 to 120.
degree.
C, the molar ratio of carboxyl groups to oxazoline groups amounting to at least 1:1, then spinning the resulting solution into filaments by a wet or dry spinning process and effecting crosslinking during drying of the filaments at a temperature of from 120 to 190.
degree.
C.
2.
The process of claim 1, wherein said acrylonitrile copolymer containing carboxyl groups is a copolymer of acrylonitrile with a member selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, undecylenic acid and a compound corresponding to the general formula: ##STR7## in which R represents hydrogen or a methyl radical X represents --O-- or --NH--, and R.
sub.
1 represents an alkylene or phenylene radical.
3.
The process of claim 1, wherein said polyoxazoline corresponds to the general formula: ##STR8## in which R.
sub.
2 and R.
sub.
3, which may be the same or different, represent hydrogen, an alkyl radical with 1 to 8 carbon atoms or an aryl radical with 6 to 12 carbon atoms, R.
sub.
4 represents a polyfunctional alkylene radical with 1 to 20 carbon atoms or an arylene radical with 6 to 12 carbon atoms, and n is an integer from 1 to 3.
4.
The process of claim 1, wherein said acrylonitrile copolymer contains polymerized acrylonitrile as the predominant monomer.
5.
The process of claim 1, wherein said acrylonitrile copolymer contains at least 58.
1% by weight of acrylonitrile.
6.
The process of claim 1 wherein spinning is accomplished by dry spinning.
7.
A crosslinked filament or fibre of an acrylonitrile copolymer containing crosslinks between the polymer chains comprising structural elements of the general formula: ##STR9## in which R.
sub
|
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Fuel Cells 
