Separator for electrochemical cell and method for its manufacture
US-2015072219-A1 · Mar 12, 2015 · US
Method for producing porous polyimide film, porous polyimide film and separator using same
US9911955B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9911955-B2 |
| Application number | US-201615334767-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 26, 2016 |
| Priority date | Apr 22, 2013 |
| Publication date | Mar 6, 2018 |
| Grant date | Mar 6, 2018 |
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- Title
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Abstract
Official abstract text for this publication.
A method for producing a porous polyimide film comprises: forming a first un-burned composite film wherein the first film is formed on a substrate using a first varnish that contains (A1) a polyamide acid or a polyimide and (B1) fine particles at a volume ratio (A1):(B1) of from 19:81 to 45:65; forming a second un-burned composite film wherein the second film is formed on the first film using a second varnish that contains (A2) a polyamide acid or a polyimide and (B2) fine particles at a volume ratio (A2):(B2) of from 20:80 to 50:50 and has a lower fine particle content ratio than the first varnish; burning wherein an un-burned composite film composed of the first film and the second film is burned, thereby obtaining a polyimide-fine particle composite film; and a fine particle removal step wherein the fine particles are removed from the polyimide-fine particle composite film.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing an unburned composite film, the method comprising: a first unburned composite film-forming step of forming a first unburned composite film of a first varnish on a substrate, the first varnish containing a polyamide acid or polyimide (A1) and fine particles (B1) at a volume ratio (A1):(B1) of 19:81 to 45:65; and a second unburned composite film-forming step of forming a second unburned composite film of a second varnish on the first unburned composite film, the second varnish containing a polyamide acid or polyimide (A2) and fine particles (B2) at a volume ratio (A2):(B2) of 20:80 to 50:50 and having a fine particle content ratio lower than that of the first varnish. 2. A method for producing a polyimide-fine particle composite film, the method comprising a burning step of burning the unburned composite film produced by the method according to claim 1 .
Assignees
Inventors
Classifications
- B32B27/34Primary
comprising polyamides · CPC title
Polyamide resins · CPC title
Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title
Manufacturing processes of separators, membranes or diaphragms · CPC title
Energy storage using batteries · CPC title
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- What does patent US9911955B2 cover?
- A method for producing a porous polyimide film comprises: forming a first un-burned composite film wherein the first film is formed on a substrate using a first varnish that contains (A1) a polyamide acid or a polyimide and (B1) fine particles at a volume ratio (A1):(B1) of from 19:81 to 45:65; forming a second un-burned composite film wherein the second film is formed on the first film using a…
- Who is the assignee on this patent?
- Tokyo Ohka Kogyo Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B32B27/34. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Mar 06 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).