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US 5,288,402 AGranted
Liquid filter medium including a fibrillated filtering layer and an organic fiber support
AssigneeMitsubishi Paper Mills Limited
InventorMitsuo Yoshida
Life of this patent
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Abstract
A two-layered filter medium for liquid filtration comprises a support composed of organic fibers of 7 .mu.m or more in diameter and basis weight of 30-150 g/m.sup.2, and a filtering layer composed of three kinds of organic fibers different in diameter, a part or all of the kind of organic fibers having the largest diameter being a fibrous organic binder.
Claims4
A filter medium for liquid filtration which comprises:
- a filtering layer comprising 5-40% by weight of fibrillated organic fibers having a fiber diameter of 1 .mu.m or less, 5-70% by weight of ultra-fine organic fibers having a fiber diameter of 1-5 .mu.m, and 20-70% by weight of organic fibers having a fiber diameter of more than 5 .mu.m, a part or all of the organic fibers having a fiber diameter of more than 5 .mu.m being a fibrous organic binder, and having an average pore size of 1-10 .mu.m and a basis weight of 5-50 g/m.sup.2, and a support comprising organic fibers having a fiber diameter of 7 .mu.m or more and a basis weight of 30-150 g/m.sup.2, and the filtering layer and the support being integrated into a piece.
Dependencies are inferred from the claim text.