Microporous film, particularly battery separator, and method of

Details Microporous film, particularly battery separator, and method of Microporous film, particularly battery separator, and method of

1979-02-28

1982-06-15

Spear, Jr., Frank A.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer, spacer or materials for use therewith

2105002, 264 49, 429254, H01M 216

Patent

active

043351930

ABSTRACT:
This invention is directed to a microporous film comprising a 40 to 90 volume percent polyolefin having a number average molecular weight of 15,000 or more and a weight average molecular weight of less than 300,000 and a 10 to 60 volume percent inorganic filler and having a void space rate or porosity of 30 to 75 volume percent based on the volume of the film. The microporous film of such specific composition and structure has a desired wettability and a much reduced electrical resistance. Said resistance being as low as 0.0006 .OMEGA.dm.sup.2 /sheet. Said film has sufficient flexibility and mechanical strength to make it useful in wide variety of applications, especially as separators in batteries or electrolytical apparatuses etc. Such microporous material is prepared by: (a) blending a specified polyolefin, an inorganic filler and an organic liquid in amounts of 10 to 60 volume percent, 6 to 35 volume percent and 30 to 75 volume percent, respectively, based on the total volume of the blend, the amount of the polyolefin being 2/3 to 9 times the amount of the inorganic filler; (b) molding the blend to form a film; and (c) extracting said organic liquid from the molded film.

REFERENCES:
patent: 3536796 (1970-10-01), Rock
patent: 3956020 (1976-05-01), Weininger et al.
patent: 3962205 (1976-06-01), Ward et al.
patent: 4190707 (1980-02-01), Doi et al.

Affiliated with

Also associated with

Rating

Microporous film, particularly battery separator, and method of does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microporous film, particularly battery separator, and method of , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microporous film, particularly battery separator, and method of will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1919564