Laminated body
US10388932B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2017 |
| Grant date | Aug 20, 2019 |
| Priority date | — |
| Expiry date | Jul 9, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A nonaqueous electrolyte secondary battery separator that is not easily curled is provided by a laminated body including a porous base material containing a polyolefin-based resin and a porous layer on at least one surface of the porous base material. The difference between the white index of a surface of the porous base material after being irradiated with ultraviolet light with an intensity of 255 W/m2 for 75 hours and the white index of the surface of the porous base material before irradiation is not more than 2.5. The porous layer contains a polyvinylidene fluoride-based resin which contains crystal form α in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form α and crystal form β contained in the resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.