EP0041333A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Production of porous diaphragm for electrolytic cell
Assignee: Imperial Chemical Industries Ltd
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Filing: 1981-05-18
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Granted: —
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Expires: 2001-05-18
Abstract
Abstract A process for the production of a porous diaphragm suitable for use in an electrolytic cell, particularly a chlor-alkali cell, characterized in that the process comprises irradiating a porous shaped article of an organic polymeric material, for example, a sheet of a fluoropolymer, with high energy radiation, the irradiation being effected in the presence of, or the irradiated shaped article being subsequently contacted with, a reactant selected from ammonia, carbon monoxide and phosgene, and the sheet preferably being subsequently contacted with an aqueous alkaline solution.
Inventors
- 👤 John Francis Cairns
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 06:24
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
62 words
A process for the production of a porous diaphragm suitable for use in an electrolytic cell characterised in that the process comprises irradiating a porous shaped article of an organic polymeric material with high energy radiation, the irradiation being effected in the presence of, or the irradiated shaped article being subsequently contacted with, a reactant selected from ammonia, carbon monoxide or phosgene.
Claim 2
Dependent Claim
62 words
A process for the production of a porous diaphragm suitable for use in an electrolytic cell characterised in that the process comprises irradiating a porous shaped article of an organic polymeric material with high energy radiation, the irradiation being effected in the presence of, or the irradiated shaped article being subsequently contacted with, a reactant selected from ammonia, carbon monoxide or phosgene.
Claim 3
Dependent Claim
21 words
A process as claimed in Claim 1 characterised in that the porous shaped article is in the form of a sheet.
Claim 4
Dependent Claim
25 words
A process as claimed in Claim 1 or Claim 2 characterised in that the porous shaped article has a microstructure of nodes interconnected by fibrils.
Claim 5
Dependent Claim
24 words
A process as claimed in any one of Claims 1 to 3 characterised in that the organic polymeric material is a fluorine-containing polymeric material.
Claim 6
Dependent Claim
28 words
A process as claimed in any one of Claims 1 to 4 characterised in that the porous shaped article has a porosity in the range 40% to 90%.
Claim 7
Dependent Claim
24 words
A process as claimed in any one of Claims 1 to 5 characterised in that the porous shaped article is irradiated with Y -rays.
Claim 8
Dependent Claim
29 words
A process as claimed in any one of Claims 1 to 6 characterised in that the porous shaped article is irradiated with at least 0.5 M Rad of radiation.
Claim 9
Dependent Claim
24 words
A process as claimed in any one of Claims 1 to 7 characterised in that irradiation is effected in the substantial absence of oxygen.
Claim 10
Dependent Claim
37 words
A process as claimed in Claim 8 characterised in that irradiation is effected in a vacuum and in that the thus irradiated shaped article is subsequently contacted with a reactant selected from ammonia, carbon monoxide and phosgene.
Claim 11
Dependent Claim
20 words
A process as claimed in any one of Claims 1 to'9 characterised in that the reactant is in gaseous form.
Claim 12
Dependent Claim
39 words
A process as claimed in any one of Claims 1 to 10 characterised in that after irradiation of the porous shaped article and contact with reactant has been effected the article is heated in the presence of the reactant.
Claim 13
Dependent Claim
27 words
A process as claimed in any one of Claims 1 to 11 characterised in that the porous shaped article is subsequently contacted with a liquid alkaline solution.
Claim 14
Dependent Claim
23 words
A process as claimed in Claim 12 characterised in that the liquid alkaline solution is an aqueous solution of an alkali metal hydroxide.
Claim 15
Dependent Claim
20 words
A process as claimed in Claim 1 substantially as hereinbefore described and as shown in Example 1 or Example 2.
Claim 16
Dependent Claim
22 words
A process as claimed in Claim 1 substantially as hereinbefore described and as shown in any one of Examples 3 to 5.
Claim 17
Dependent Claim
17 words
A porous diaphragm produced by a process as claimed in any one of Claims 1 to 15.
References Cited (Backward Citations)
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