Hydrophilic porous structures and process for production thereof

• US 4,113,912 A
• Filed: 08/10/1977
• Issued: 09/12/1978
• Est. Priority Date: 08/10/1976
• Status: Expired due to Term

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Okita, Koichi
• Primary Examiner(s): Van Balen, William J.
• Application Number:
  US05/823,474
• Time in Patent Office: 398 Days
• Field of Search: 428/304, 428/306, 428/141, 428/147, 428/421, 428/290, 428/422, 204/159.17, 264/127, 260/2.5 M, 427/316
• US Class Current: 442/118
• CPC Class Codes: B01D 67/0088 Physical treatment with compounds, e.g. swelling, coating or impregnation
• CPC Class Codes: B01D 71/32 containing fluorine atoms
• CPC Class Codes: C08J 2327/12 containing fluorine atoms
• CPC Class Codes: C08J 2429/00 Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
• CPC Class Codes: C08J 2433/00 Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
• CPC Class Codes: C08J 2439/00 Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Derivatives of such polymers
• CPC Class Codes: C08J 9/42 with macromolecular compounds
• CPC Class Codes: Y10T 428/249978 Voids specified as micro
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31544 Addition polymer is perhalogenated
• CPC Class Codes: Y10T 442/2484 Coating or impregnation is water absorbency-increasing or hydrophilicity-increasing or hydrophilicity-imparting
• CPC Class Codes: Y10T 442/2861 Coated or impregnated synthetic organic fiber fabric

Abstract

A hydrophilic porous structure comprising a porous fluorocarbon resin structure with the pores of the fluorocarbon resin structure containing at least one water-insolubilized water-soluble polymer and a process for the production thereof.

Claims

1. A hydrophilic porous structure comprising a porous fluorocarbon resin structure with the pores of the fluorocarbon resin structure containing at least one water-isolubilized water-soluble polymer.

2. The structure of claim 1, wherein the water-insolubilized polymer is partly or wholly crosslinked to form a microporous swollen gel.

3. The structure of claim 1, wherein the water-soluble polymer is a hydroxyl group-containing polymer.

4. The structure of claim 2, wherein the water-soluble polymer is a hydroxyl group-containing polymer.

5. The structure of claim 3, wherein the hydroxyl group-containing polymer is polyvinyl alcohol.

6. The structure of claim 4, wherein the hydroxyl group-containing polymer is polyvinyl alcohol.

7. The structure of claim 1, wherein the water-soluble polymer is a carboxyl group-containing polymer.

8. The structure of claim 2, wherein the water-soluble polymer is a carboxyl group-containing polymer.

9. The structure of claim 7, wherein the carboxyl group-containing polymer is polyacrylic acid.

10. The structure of claim 8, wherein the carboxyl group-containing polymer is a polyacrylic acid.

11. The structure of claim 1, wherein the water-soluble polymer is a nitrogen containing polymer.

12. The structure of claim 2, wherein the water-soluble polymer is a nitrogen-containing polymer.

13. The structure of claim 11, wherein the nitrogen-containing polymer is polyacrylamide.

14. The structure of claim 12, wherein the nitrogen-containing polymer is polyacrylamide.

15. The structure of claim 11, wherein the nitrogen-containing polymer is polyvinylpyrrolidone.

16. The structure of claim 12, wherein the nitrogen-containing polymer is polyvinylpyrrolidone.

17. The structure of claim 1, wherein the water-soluble polymer is a mixture of a hydroxyl group-containing polymer and a carboxyl group-containing polymer.

18. The structure of claim 2, wherein the water-soluble polymer is a mixture of a hydroxyl group-containing polymer and a carboxyl group-containing polymer.

19. The structure of claim 1, wherein the water-soluble polymer is a mixture of a hydroxyl group-containing polymer and a nitrogen-containing polymer.

20. The structure of claim 2, wherein the water-soluble polymer is a mixture of a hydroxyl group-containing polymer and a nitrogen-containing polymer.

21. The structure of claim 1, wherein the porous fluorocarbon resin structure is a porous polytetrafluoroethylene structure.

22. The structure of claim 2, wherein the porous fluorocarbon resin structure is a porous polytetrafluoroethylene structure.

23. The structure of claim 21, wherein the porous polytetrafluoroethylene has a microstructure containing nodes connected to one another by fibers.

24. The structure of claim 22, wherein the porous polytetrafluoroethylene has a microstructure containing nodes connected to one another by fibers.

25. The structure of claim 1, wherein the porous fluorocarbon resin structure is a porous polyvinylidene fluoride structure.

26. The structure of claim 2, wherein the porous fluorocarbon resin structure is a porous polyvinylidene fluoride structure.

27. A process for producing the porous structure of claim 1, which comprises impregnating the pores of a porous fluorocarbon resin with at least one water-soluble polymer including polyvinyl alcohol, and water-insolubilizing the polyvinyl alcohol by heat-treatment.

28. The process for producing the porous structure of claim 1, which comprises impregnating the pores of a porous fluorocarbon resin with at least one water-soluble polymer, and water-insolubilizing a part or all of the water-soluble polymer by acetalization.

29. A process for producing the porous structure of claim 1, which comprises impregnating the pores of a porous fluorocarbon resin with at least one water-soluble polymer including polyvinyl alcohol, and water-insolubilizing the polyvinyl alcohol by acetalization.

30. A process for producing the porous structure of claim 1, which comprises impregnating the pores of a porous fluorocarbon resin with at least one water-soluble polymer including a carboxyl group-containing water-soluble polymer, and water-insolubilizing a part or all of the carboxyl group-containing water-soluble polymer by esterification.

31. A process for producing the porous structure of claim 1, which comprises impregnating the pores of a porous fluorocarbon resin with at least one water-soluble polymer, and water-insolubilizing a part or all of the water-soluble polymer using ionizing radiation.