Polyketone porous film
To provide a polyketone porous film having heat resistance and chemical resistance and useful as a filter for filtration having a high particle collection efficiency and as a battery or capacitor separator having a low permeation resistance to ion and the like. A polyketone porous film comprising from 10 to 100 mass % of a polyketone as a copolymer of carbon monoxide and one or more olefins, wherein the polyketone porous film has a pore formed only by a polyketone, the pore diameter uniformity parameter as a value obtained by dividing the standard deviation of the pore diameter in the pore by an average pore diameter is from 0 to 1.0, and the average through hole diameter of the polyketone porous film is from 0.01 to 50 μm.
1. A polyketone porous film comprising from 10 to 100 mass % of a polyketone as a copolymer of carbon monoxide and one or more olefins, wherein:
said polyketone porous film has a pore formed only by a polyketone, the pore diameter uniformity parameter as a value obtained by dividing the standard deviation of the pore diameter in said pore by an average pore diameter is from 0 to 1.0, and the average through hole diameter of the polyketone porous film is from 0.01 to 50 μm; and
the polyketone porous film has a polyketone part which has a fibrous structure.
2. The polyketone porous film according to claim 1 , wherein the porosity of said polyketone porous film is from 5 to 95%.
3. The polyketone porous film according to claim 1 , wherein said polyketone contains a repeating unit represented by the following chemical formula (1):
wherein R is a substituted or unsubstituted hydrocarbon group having a carbon number of 2 to 20.
4. The polyketone porous film according to claim 3 , wherein
said R contains one or more members selected from the group consisting of a hydrogen atom, a halogen atom, a hydroxyl group, an ether group, a primary amino group, a secondary amino group, a tertiary amino group, a quaternary ammonium group, a sulfonic acid group, a sulfonic acid ester group, a carboxylic acid group, a carboxylic acid ester group, a phosphoric acid group, a phosphoric acid ester group, a thiol group, a sulfide group, an alkoxysilyl group and a silanol group.
5. The polyketone porous film according to claim 3 , wherein
relative to repeating units constituting said polyketone, the ratio of a repeating unit that is the repeating unit represented by chemical formula (1) where R contains one or more functional groups selected from the group consisting of a hydroxyl group, an ether group, a primary amino group, a secondary amino group, a tertiary amino group, a quaternary ammonium group, a sulfonic acid group, a sulfonic acid ester group, a carboxylic acid group, a carboxylic acid ester group, a phosphoric acid group, a phosphoric acid ester group, a thiol group, a sulfide group, an alkoxysilyl group and a silanol group is from 0.1 to 30 mol %.
6. The polyketone porous film according to claim 1 , wherein the ratio of a 1-oxotrimethylene repeating unit represented by the following chemical formula (2) relative to repeating units constituting said polyketone is 70 mol % or more:
7. The polyketone porous film according to claim 1 , wherein said polyketone contains a structure represented by the following chemical formula (3):
wherein each of R 1 , R 2 and R 3 is independently a group containing one or more members selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group having a carbon number of 1 to 20, a hydroxyl group, an ether group, a primary amino group, a secondary amino group, a tertiary amino group, a quaternary ammonium group, a sulfonic acid group, a sulfonic acid ester group, a carboxylic acid group, a carboxylic acid ester group, a phosphoric acid group, a phosphoric acid ester group, a thiol group, a sulfide group, an alkoxysilyl group and a silanol group in an amount of 30 mass % or less.
8. The polyketone porous film according to claim 7 , wherein in chemical formula (3), both R 1 and R 2 are hydrogen.
9. The polyketone porous film according to claim 1 , which has a pore with a long diameter of 0.02 to 20 μm, a short diameter of 0.01 to 5 μm and an ellipticity of 0.5 to 0.95.
10. The polyketone porous film according to claim 1 , which is in a flat film form.
11. A lithium secondary battery separator obtained by using the polyketone porous film according to claim 10 .
12. A capacitor separator obtained by using the polyketone porous film according to claim 10 .
13. The capacitor separator according to claim 12 , wherein said capacitor is an electrolytic capacitor, an electrical double layer capacitor or a lithium ion capacitor.
14. A developing phase for immunochromatography, obtained by using the polyketone porous film according to claim 10 .
15. A scaffold member for cell culture, obtained by using the polyketone porous film according to claim 10 .
16. The polyketone porous film according to claim 1 , which is a hollow fiber membrane having one or more voids penetrating in the longitudinal direction.
17. The polyketone porous film according to claim 1 , which is a composite comprising said polyketone and at least one nonwoven fabric.
18. The polyketone porous film according to claim 17 , wherein said nonwoven fabric is composed of a thermoplastic synthetic fiber and said nonwoven fabric comprises (A) a nonwoven fabric layer having a fiber diameter of 5 to 20 μm and (B) a nonwoven fabric layer having a fiber diameter of 0.5 to 4 μm in a composite integral manner of A/B/A type or A/B type.
19. A filter for filtration, obtained by using the polyketone porous film according to claim 1 .
20. The filter for filtration according to claim 19 , which is a filter for water treatment, a filter for membrane bioreactor, a filter for industrial liquid filtration, a filter for deaeration, a filter for removing contamination from gas, a filter for chemical filter, or a medical filter.
21. A polyketone porous film according to claim 1 wherein in the fibrous structure a ratio of the number of fibrous materials having a size of 0.5 microns or less to the total number of fibrous materials is 70% or less.