Process for production of porous reticulated composite materials

• US 20070003749A1
• Filed: 06/30/2006
• Published: 01/04/2007
• Est. Priority Date: 07/01/2005
• Status: Abandoned Application

• Current Assignee: Cinvention AG
• Original Assignee: Cinvention AG
• Inventors: Asgari, Soheil
• Application Number:
  US11/479,657
• Publication Number:
  US 20070003749A1
• Time in Patent Office: Days
• US Class Current: 428/304.400
• CPC Class Codes: A61L 27/34 Macromolecular materials
• CPC Class Codes: A61L 27/446 with other specific inorganic fillers other than those covered by A61L27/443 or A61L27/46
• CPC Class Codes: A61L 27/56 Porous materials, e.g. foams or sponges
• CPC Class Codes: B05D 1/60 Deposition of organic layers from vapour phase vapour phase deposition in general C23C14/00, C23C16/00
• CPC Class Codes: B05D 5/00 Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
• CPC Class Codes: B05D 7/16 using synthetic lacquers or varnishes
• CPC Class Codes: C08J 3/20 Compounding polymers with additives, e.g. colouring
• CPC Class Codes: C08J 3/24 Crosslinking, e.g. vulcanising, of macromolecules mechanical aspects B29C35/00; crosslinking agents C08K
• CPC Class Codes: C08J 9/26 by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
• CPC Class Codes: C08J 9/28 by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]

Abstract

The present invention relates to porous reticulated composite materials and processes for the production thereof. For example, a process for the production of porous composite materials can be provided in which a mixture capable of flowing comprising at least one inorganic and/or organic reticulating agent and at least one polymeric matrix material is provided, and the liquid mixture is caused to be solidified.

Claims

1. A process for manufacturing a porous composite material comprising:

providing a liquid mixture comprising at least one reticulating agent and at least one matrix material which comprises at least one organic polymer; and

causing the liquid mixture to solidify.

2. The process of claim 1, wherein the liquid mixture is substantially free from any solvent.

3. The process of claim 1, wherein the at least one reticulating agent has a form of a plurality of particles.

4. The process of claim 3, wherein the plurality of particles has a mean particle size between about 1 nm and about 300 μ

m.

5. The process of claim 3, wherein the plurality of particles has a mean particle size between about 1 nm and about 6 μ

m.

6. The process of claim 3, wherein the at least one reticulating agent comprises at least two particle size fractions, and wherein the particle size fractions differ in size from one another by a factor of at least about 2.

7. The process of claim 1, wherein the at least one reticulating agent has at least one of a tube form, a fiber form or a wire form.

8. The process of claim 7, wherein the at least one reticulating agent has an average length between about 5 nm and about 10 μ

m.

9. The process of claim 7, wherein the at least one reticulating agent has an average diameter between about 1 nm and about 1 μ

m.

10. The process of claim 1, wherein the at least one reticulating agent comprises at least one of a magnetic metal, a superparamagnetic metal or a ferromagnetic metal, and wherein the at least one reticulating agent further comprises at least one of iron, cobalt, nickel, manganese, an iron-platinum mixture, an iron-platinum alloy, a metal oxide, a magnetite of at least one of iron, cobalt, nickel or manganese, or a ferrite of at least one of iron, cobalt, nickel or manganese.

11. The process of claim 1, wherein the liquid mixture further comprises at least one further additive which includes at least one of cross linkers, fillers, surfactants, acids, bases, pore-forming agents, plasticizers, lubricants, flame resistants, biologically active compounds, therapeutically active compounds, agents adopted for diagnostic purposes, or markers.

12. The process of claims 1, wherein the liquid mixture has a total solids content that is less than about 20% by weight.

13. The process of claim 1, wherein the liquid mixture has a total solids content that is less than about 5% by weight.

14. The process of claim 1, wherein the causing step includes a further substep of at least one of separating the liquid mixture into a solid phase and a liquid phase, or precipitating a solid phase from the liquid mixture.

15. The process of claim 14, wherein the separating of the liquid mixture is induced by cross linking the at least one matrix material.

16. The process of claim 1, wherein the causing step comprises applying a thermal treatment to the liquid mixture.

17. The process of claim 1, wherein the liquid mixture further comprises at least one solvent.

18. The process of claim 17, wherein the boiling point of the at least one solvent is at least about 30 to 200°

C. below a melting point of the at least one matrix material.

19. The process of claim 17, wherein the boiling point of the at least one solvent is at least about 20 to 100°

C. above a melting point of the at least one matrix material.

20. The process of claim 17, wherein the solidifying step comprises evaporating the at least one solvent.

21. The process of claim 1, wherein the liquid mixture further comprises at least one cross linker which is selected such that a viscosity of the liquid mixture remains substantially unchanged prior to the step of solidifying the liquid mixture.

22. The process of claim 21, wherein the causing step is performed during a cross linking reaction.

23. The process of claim 22, further comprising interrupting the cross linking reaction and removing at least one portion of the at least one organic polymer that is not cross linked from the porous composite material.

24. The process of claim 1, wherein:

the at least one reticulating agent includes at least one of soot, fullerenes, carbon fibers, silica, titanium dioxide, metal particles, tantalum particles, or polyethylene particles,

the at least one matrix material comprises at least one of an epoxy resin or a phenoxy resin,

the liquid mixture further comprises at least one organic solvent, and

the causing step comprises removing the at least one organic solvent using a heat treatment.

25. The process of claim 1, further comprising at least one of impregnating, coating or infiltrating the porous composite material with at least one therapeutically active agent.

26. A porous composite material obtained by solidifying a liquid mixture comprising at least one reticulating agent and at least one matrix material, the at least one matrix material comprising at least one organic polymer.

27. The porous composite material of claim 26, wherein the porous composite material is provided in a form of a coating.