IL41302A - A process for the production of porous asymmetric materia - Google Patents
A process for the production of porous asymmetric materiaInfo
- Publication number
- IL41302A IL41302A IL41302A IL4130273A IL41302A IL 41302 A IL41302 A IL 41302A IL 41302 A IL41302 A IL 41302A IL 4130273 A IL4130273 A IL 4130273A IL 41302 A IL41302 A IL 41302A
- Authority
- IL
- Israel
- Prior art keywords
- solvent
- polymer
- temperature
- transition temperature
- sol
- Prior art date
Links
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Claims (8)
1. . A process for the production of polymeric products having a porous nner layer and dense surface layers , comprising: preparing a sol vent/polymer system having a sol ution/ gal transition at a polymer content of 10-75% by weight, sai d solvent/polymer system having at the sol ution/gel transition temperature a surface tension lower than that of the solvent at the same temperature; dispensing the solvent/polymer mixture from a sui table device In the desi red form at a temperature above the sol ution/ gel transi tion temperature ; cooling the product to below this transition temperature ; removing the sol vent below the said transition temperature .
2. A process as claimed 1n claim 1 , wherein the solvent 1s removed by evaporation.
3. A process as claimed in claim 1 , wherein the solvent 1s removed by leaching wi th a substance 1n which the polymer 1s Insol uble and whi ch Is compatible wi th the solvent.
4. A process as claimed 1n any of claims 1 to 3, wherein the polymer 1s polypropylene, polyphenylene oxi de or nylon 11 .
5. ; A process as claimed In any of claims 1 to 4, wherein the solvent 1s tetral n; qulnollne and tetralln naphthalene ; decalln, tetralln and tetrabromoe thane, bromonaphthalene or benzyl alcohol and for-mamlde.
6. A process as claimed In any of claims 1 to 5, wherein the product 41302/2 - Π -
7. A process as claimed In any of claims 1 to 6, which comprises removing the dense surface layer from one of the surfaces.
8. A modification of the process claimed n claim 1 , resulting in a porous product without a dense surface layer, which comprises effecting the process with a system wherein the surface tension of the polymer/solvent system at the transition temperature Is higher than that of the solvent at the same temperature. LTD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL41302A IL41302A (en) | 1973-01-17 | 1973-01-17 | A process for the production of porous asymmetric materia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL41302A IL41302A (en) | 1973-01-17 | 1973-01-17 | A process for the production of porous asymmetric materia |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IL41302A0 IL41302A0 (en) | 1973-06-29 |
| IL41302A true IL41302A (en) | 1976-07-30 |
Family
ID=11046910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL41302A IL41302A (en) | 1973-01-17 | 1973-01-17 | A process for the production of porous asymmetric materia |
Country Status (1)
| Country | Link |
|---|---|
| IL (1) | IL41302A (en) |
-
1973
- 1973-01-17 IL IL41302A patent/IL41302A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IL41302A0 (en) | 1973-06-29 |
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