Microporous plastic member such as a battery separator and proce

Details Microporous plastic member such as a battery separator and proce Microporous plastic member such as a battery separator and proce

1974-10-15

1979-05-08

Walton, Donald L.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer, spacer or materials for use therewith

264 453, 264 461, 264 49, 264177R, 264211, 264DIG17, H01M 216, B29H 720, C04B 3332

Patent

active

041537602

ABSTRACT:
A process for producing a microporous plastic member useful as a battery separator which comprises
(a) forming a coherent dough by mixing a vinyl chloride resin with a plasticizing amount of a first solvent and with finely divided particles of a filler which contains volatilizable constituent releasable therefrom by heating and which shrinks substantially and irreversibly upon release of said volatilizable constituent therefrom, an example of which is hydrated silica;
(b) forming the solvent-containing dough into a shaped member;
(c) extracting the first solvent from the member before any substantial evaporation of solvent occurs by contacting it with a second solvent in a liquid bath at a temperature substantially below the boiling point of any liquid present, the second solvent being one which is capable of dissolving the first solvent without dissolving the resin and the filler, thereby deplasticizing the member by extractively removing the first solvent from the member; and
(d) thereafter heating the member at an elevated temperature but below the softening point of the resin until the filler is shrunk within the member by release of its volatilizable content.

REFERENCES:
patent: 2700694 (1955-01-01), Fernald
patent: 2707201 (1955-04-01), Fernald et al.
patent: 2772322 (1966-11-01), Witt et al.
patent: 3085292 (1963-04-01), Kindseth
patent: 3351495 (1967-11-01), Larsen et al.
patent: 3486946 (1969-12-01), Duddy

Affiliated with

Also associated with

Rating

Microporous plastic member such as a battery separator and proce 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 plastic member such as a battery separator and proce, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microporous plastic member such as a battery separator and proce will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1234392