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US 8,573,408 B2Granted
Crystalline polymer microporous membrane, method for producing the same, and filtration filter
AssigneeFUJIFILM Corporation
InventorsKenichi Ishizuka, Nobuhiro Nishita
Life of this patent
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Abstract
A crystalline polymer microporous membrane, which contains: a microporous film formed of a crystalline polymer, which has a plurality of pores; and a hydrophilic polymer containing a hydroxyl group, which covers exposed surfaces of the microporous film, wherein the plurality of pores have a larger average pore diameter at a first surface of the film than the average pore diameter at a second surface of the film, and the average pore diameter of the pores continuously changes from the first surface to the second surface.
Claims8
A crystalline polymer microporous membrane, comprising:
- a microporous film formed of a crystalline polymer, which has a plurality of pores;
- and
- a hydrophilic polymer containing a hydroxyl group, which covers exposed surfaces of the microporous film,
- wherein the plurality of pores have a larger average pore diameter at a first surface of the film than the average pore diameter at a second surface of the film, the average pore diameter of the pores continuously changes from the first surface to the second surface, the saponification value of the hydrophilic polymer is 50 to 100, and the hydrophilic polymer is crosslinked with a crosslinking agent which is a polyfunctional epoxy compound.
1 more element
A filtration filter, comprising:
- a crystalline polymer microporous membrane, which comprises:
- a microporous film formed of a crystalline polymer, which has a plurality of pores;
- and
- a hydrophilic polymer containing a hydroxyl group, which covers exposed surfaces of the microporous film,
- wherein the plurality of pores have a larger average pore diameter at a first surface of the film than the average pore diameter at a second surface of the film, the average pore diameter of the pores continuously changes from the first surface to the second surface, the saponification value of the hydrophilic polymer is 50 to 100, and the hydrophilic polymer is crosslinked with a crosslinking agent which is a polyfunctional epoxy compound.
2 more elements
Dependencies are inferred from the claim text.