Mitsubishi Paper Mills Limited

Keisuke Oyama

Yusuke Shimizu

Takao Masuda

Tomohiro Sato

Takahito Ochiai

A semipermeable membrane support containing polyolefin-based fibers, which can withstand repeated washing and backwashing, makes it easy for a semipermeable membrane component to permeate thereinto and difficult for the component to strike therethrough, and is excellent in adhesion to the semipermeable membrane and adhesion between a non-coating surface thereof and a resin frame. The semipermeable membrane support which is used by forming the semipermeable membrane thereon is a wet-laid nonwoven fabric containing core-sheath type conjugate fibers composed of polypropylene as a core component and polyethylene as a sheath component and has a burst strength of 300 to 1,000 kPa, or the Bekk smoothness and 75° mirror surface glossiness of the coating surface on which the semipermeable membrane is to be formed of the semipermeable membrane support being more than the Bekk smoothness and 75° mirror surface glossiness of a non-coating surface on the opposite side.

Semipermeable membrane support

An object of the present invention is to provide a solid electrolytic capacitor separator configured such that thickness non-uniformity is reduced, internal short-circuit is less likely to occur, an impedance is not too high, and a high heat resistance is exhibited. In a solid electrolytic capacitor separator including non-woven fabric, the non-woven fabric contains fibrillated heat-resistant fibers and synthetic short fibers as essential components, the fiber length of the fibrillated heat-resistant fiber is 0.30 to 0.75 mm, and the percentage of fibrillated heat-resistant fibers with a fiber width of 12 to 40 &#x3bc;m is equal to or higher than 55% and lower than 75%.

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Tokyo, Japan

Keisuke Oyama