Claims
- 1. A composite porous polymeric membrane which comprises a porous membrane substrate having an average pore size between about 0.001 and 10 microns formed of a first polymer, said substrate having a surface which is modified on its entire surface with a cross-linked second polymer formed from a polymerizable fluorine containing monomer, said monomer being polymerized and crosslinked in situ on said substrate, said second polymer having a wettability such that it does not wet with solvents whose surface tension is greater than about 21 dynes/cm and said composite porous membrane having essentially the same porous configuration as said porous membrane substrate.
- 2. A composite porous polymeric membrane which comprises a porous membrane substrate having an average pore size between about 0.001 and 10 microns formed of a first polymer, said substrate having a surface which is modified on its entire surface with a cross-linked second polymer formed from a polymerizable fluorine containing monomer, said monomer being polymerized and crosslinked in situ on said substrate, said second polymer having a wettability such that it passes the MVI test, and said composite porous membrane having essentially the same porous configuration as said porous membrane substrate.
- 3. The composite porous polymeric membrane of any one of claims 1 or 2 wherein the first polymer is a polyamide.
- 4. The composite porous polymeric membrane of any one of claims 1 or 2 wherein the first polymer is a fluorinated hydrocarbon polymer.
- 5. The composite porous polymeric membrane of any one of claims 1 or 2 wherein the first polymer is a cellulosic
- 6. The composite porous polymeric membrane of any one of claims 1 or 2 wherein the first polymer is polyvinylidene fluoride.
- 7. The composite porous polymeric membrane of any one of claims 1 or 2 wherein the first polymer is a polyolefinic hydrocarbon.
- 8. The composite porous polymeric membrane of any one of claims 1 or 2 wherein the first polymer is a polysulfone.
- 9. The composite porous polymeric membrane of any one of claims 1 or 2 wherein the first polymer is a polyester.
- 10. The composite porous polymeric membrane of any one of claims 1 or 2 wherein the first polymer is a polyurethane.
- 11. The composite porous polymeric membrane of any one of claims 1 or 2 wherein the first polymer is a polycarbonate.
- 12. The composite porous membrane of any one of claims 1 or 2 wherein said second polymer is formed from an ethylenically unsaturated monomer having at least one fluoroalkyl group.
- 13. The composite porous membrane of any one of claims 1 or 2 wherein the second polymer is formed from an ethylenically unsaturated monomer having at least one fluoroalkyl group in the presence of a cross-linking agent.
- 14. The composite porous product produced by any one of claims 1 or 2 having a burst strength as measured with an unsupported 13 millimeter diameter disk of said composites at least 10 psi in a forward direction and in a reverse direction after said composite is exposed to sterilizing ionizing radiation.
Parent Case Info
This is a divisional of copending application Ser. No. 07/852,584 filed Mar. 17, 1992, now U.S. Pat. No. 5,217,802.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4954256 |
Degen et al. |
Sep 1990 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
852584 |
Mar 1992 |
|