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Shaped articles which are composed of a copolymer containing fluorine groups and which are selectively permeable to liquids and gases and are simultaneously oleophobic and oleophilic
| Details |
Inventors: Walch, Axel; Seifried, Walter; Michel, Wolfgang; Kuhls, Jurgen; Wildhardt, Jurgen;
Assignee: Hoechst Aktiengesellschaft (Frankfurt am Main, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
The invention relates to films and tubular structures which are selectively permeable to liquids and gases which are based on a copolymer composed of a copolymerized fluorinated olefin, copolymerized vinyl acetate and, optionally, a copolymerized olefin. It is possible for the acetate groups of the copolymer to have been saponified to form OH groups. The films or tubular structures have in each case an inherent, latent capacity for modifying their structure and are at the same time oleophobic and oleophilic. The invention also embraces processes for the preparation of the shaped articles described and processes for modifying their structure. The invention also relates to the use of shaped articles according to the invention. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide shaped articles which, because of the qualitative and quantitative chemical structure of the copolymer of which they are formed, have the property of being at the same time oleophobic and oleophilic.
It is also an object of the invention to provide such shaped articles which are compatible with a very wide variety of constituents with which they are in contact and which have a permeability to liquids and gases which can be adjusted in a variable manner within a wide field.
Another object of the invention is to provide shaped articles which are resistant to corrosive chemical agents and can be dried with or without plasticizers without their pattern of properties being altered and can be remoistened extremely rapidly with different media.
A still further object of the invention is to provide a process for preparing the shaped articles according to the invention.
Another object of the invention resides in providing a process for converting the shaped article of the invention so as to modify its structure.
Finally, it is also an object of the invention to provide several improved articles of manufacture utilizing the shaped articles of the invention, including improved filter membranes, envelopes for containing chemical media, information carriers and analytical and/or diagnostic devices.
In accomplishing the foregoing objects, there has been provided in accordance with one aspect of the present invention a shaped article which is selectively permeable to liquids and gases, comprising a copolymer containing fluorine groups and which is comprised of at least 50% by weight of a copolymer which is comprised of from about 20 to 80%, preferably 30 to 70% by weight, relative to the total weight of the copolymer, of a copolymerized fluorinated olefin, from about 0 to 40%, preferably 0 to 20% by weight, relative to the total weight of the copolymer, of a copolymerized olefin and from about 80 to 20%, preferably 70 to 30% by weight, relative to the total weight of the copolymer, of copolymerized vinly acetate, wherein optionally at least about 5% by weight of the total acetate groups, and preferably at least about 80% thereof, have been converted to OH groups by saponification of the copolymer
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