Polycarbonate films for capacitors, methods of manufacture, and articles manufactured therefrom
US9567445B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2014 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Aug 28, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2479/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A film comprises a phthalimidine copolycarbonate comprising first repeating units and second repeating units different from the first repeating units, wherein the first repeating units are phthalimidine carbonate unitsandthe second repeating units comprise bisphenol carbonate units that are not the same as the first repeating phthalimidine carbonate units; and a second polycarbonate that is not a phthalimidine copolycarbonate; wherein the film has: a glass transmission temperature of greater than 170° C.; a dielectric constant at 1 kHz, 23° C. and 50% relative humidity of at least 3.0; a dissipation factor at 1 kHz, 23° C. and 50% relative humidity of 1% or less; and a breakdown strength of at least 800 Volt/micrometer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.