Method for producing carbonaceous film, method for producing graphite film, roll of polymer film, and roll of carbonaceous film
US8992876B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2012 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Mar 26, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2237/84
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed herein is a method for producing an elongated (rolled) carbonaceous film by polymer pyrolysis while suppressing the fusion bonding and the rippling of the carbonaceous film. The method for producing a carbonaceous film includes the step of heat-treating a polymer film wound into a roll, wherein the heat treatment is performed after the polymer film is wound into a roll at a temperature lower than a pyrolysis onset temperature of the polymer film so that the roll of polymer film has a center and has a space inside its cross-sectional circle (50% cross-sectional circle) (space within 50% cross-sectional circle) whose center is at the center and whose circumference passes through a point at which a length of the polymer film from an inner end thereof is 50% of a total length of the polymer film and that an area of the space within 50% cross-sectional circle is 25% or more of an area of the 50% cross-sectional circle. Particularly, providing a space between a core and an innermost layer of the roll of polymer film is more effective at solving the above problem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.