Patent ID: 11931700
Assignee: TEIJIN LIMITED
Field: Chemical engineering (Chemistry)
Classification: CPC B  Y | IPC B

Claim 0:
1. A liquid filter formed of a polyolefin microporous membrane, wherein:
a mean flow pore size dPP in a first pore size distribution of the polyolefin microporous membrane measured by a half dry method according to gas-liquid phase substitution is from 1 nm to 20 nm,
a mean flow pore size dLLP in a second pore size distribution of the polyolefin microporous membrane measured by a half dry method according to liquid-liquid phase substitution is from 1 nm to 8 nm,
a difference (dPP−dLLP) between the mean flow pore size dPP and the mean flow pore size dLLP is from 2 nm to 12 nm,
a thickness of the polyolefin microporous membrane is from 4 to 25 μm, a maximum pore size in the first and the second pore size distribution of the polyolefin microporous membrane is from 17 nm to 25 nm, and
the polyolefin microporous membrane is a polyethylene microporous membrane which consists of polyethylene.