Claims
- 1. A porous, non-friable polymer film having a network of pores or channels throughout comprising: a blend of (a) at least one squeous latex dispersion of polymer particles that are non-film forming; and (b) at least one aqueous latex dispersion of polymer particles that are film forming, wherein polymer particles of (b) have diameters small enough to fit into interstices formed between polymer particles of (a) and wherein the film forming polymer particles are present in the blend in an amount from between 5 and 35%, based on the total volume of (a) and (b).
- 2. The porous, non-friable polymer film according to claim 1, wherein the film forming polymer particles have a Tg not greater than 20 C. and the non-film forming polymer particles have a Tg of at least 30 C.
- 3. The porous, non-friable polymer film according to claim 1, wherein the non-film forming polymer particles are prepared from acrylic polymers.
- 4. The porous, non-friable polymer film according to claim 1, wherein the film forming latex polymer particles have particle diameters 20% or less in size than particle diameters of the non-film forming polymer particles.
- 5. The porous, non-friable polymer film according to claim 1, wherein the polymer film maintains porosity up to 160° C.
CROSS REFERENCE TO RELATED PATENT APPLICATIONS
This is a non-provisional application of prior pending U.S. provisional application serial No. 60/241,603 filed Oct. 19, 2000.
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Kind |
4791151 |
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Dec 1988 |
A |
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Sep 1992 |
A |
5308890 |
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Country |
0 288 203 |
Apr 1988 |
EP |
0711 199 |
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EP |
Non-Patent Literature Citations (2)
Entry |
Journal of Membrane Science 155 (1999), “Porous latex composite membranes: fabrication and properties”, Steven Jons, Paul Ries, Charles J. McDonald, pp. 79-99. |
Biotechnology and Bioengineering, vol. 62, No. 1, Jan. 5, 1999; “A Patch Coating Method for Preparing Biocatalytic Films of Escherichia coli”, pp. 44-55. |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/241603 |
Oct 2000 |
US |