Polycarbonate resin film, and transparent film and process for producing the same
US10632696B2 · kind B2 · utility
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Key dates
| Filing date | May 5, 2017 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Jul 1, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed herein is a process for producing a transparent film, including the step of stretching a film in at least one direction under a condition(s) that satisfies an expression (5): 200%/min≤[stretching speed(strain rate)]≤1,200%/min (5), wherein the film comprises a polycarbonate resin containing at least a constitutional unit derived from a dihydroxy compound (A) that has a bonded structure represented by a structural formula (1): in which no hydrogen atom is bonded to the oxygen atom contained in the structural formula (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.