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Composite porous film having excellent heat resistance
US9748542B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9748542-B2 |
| Application number | US-201314422000-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 30, 2013 |
| Priority date | Aug 23, 2012 |
| Publication date | Aug 29, 2017 |
| Grant date | Aug 29, 2017 |
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- Title
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Abstract
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To provide a composite porous film in which thermal shrinkage is satisfactorily suppressed even when temperature exceeds a melting temperature of a polyolefin resin, adhesion between a microporous membrane and a heat-resistant layer is improved, and dropout of an inorganic filler is suppressed. The composite porous film is composed of the heat-resistant layer formed of the inorganic filler and a binder, and the microporous membrane formed of the polyolefin resin, and the composite porous film having a primary particle size of the inorganic filler in the range of 5 nanometers to 100 nanometers.
First claim
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What is claimed is: 1. A composite porous film comprising a heat-resistant layer formed of an inorganic filler and a binder, and a microporous membrane formed of a polyolefin resin, wherein the heat-resistant layer is laminated on the microporous membrane, a primary particle size of the inorganic filler is 5 nanometers to 100 nanometers, a weight average molecular weight (Mw) of the binder is 300,000 to 1,000,000, a molecular weight distribution (Mw/Mn) of the binder is 2.0 or less, and the microporous membrane has a film thickness of 10-30 micrometers and a porosity of 40 to 60%. 2. The composite porous film according to claim 1 , wherein the inorganic filler constituting the heat-resistant layer is at least one kind selected from the group consisting of alumina, boehmite, silica and titania. 3. The composite porous film according to claim 1 , wherein the inorganic filler constituting the heat-resistant layer comprises an aggregate of a plurality of primary particles, and a mean particle size of the aggregate is 0.3 micrometer or less. 4. The composite porous film according to claim 1 , wherein the microporous membrane constituting the composite porous film is prepared by a dry uniaxial stretching method. 5. The composite porous film according to claim 1 , wherein the polyolefin resin constituting the microporous membrane is polypropylene.
Assignees
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Classifications
with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title
mono-axially · CPC title
Homopolymers or copolymers of vinylidene fluoride · CPC title
Homopolymers or copolymers of ethene · CPC title
bi-axially · CPC title
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- What does patent US9748542B2 cover?
- To provide a composite porous film in which thermal shrinkage is satisfactorily suppressed even when temperature exceeds a melting temperature of a polyolefin resin, adhesion between a microporous membrane and a heat-resistant layer is improved, and dropout of an inorganic filler is suppressed. The composite porous film is composed of the heat-resistant layer formed of the inorganic filler and …
- Who is the assignee on this patent?
- Jnc Corp, Jnc Petrochemical Corp
- What technology area does this patent fall under?
- Primary CPC classification B32B27/08. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Aug 29 2017 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).