Title:
THERMALLY STABLE, LOW BIREFRINGENT COPOLYIMIDE FILMS
Document Type and Number:
WIPO Patent Application WO/2013/028509
Kind Code:
A3
Abstract:
A class of solvent resistant, flexible copolyimide substrates having high optical transparency (>80% from 400 to 750 nm) that is retained after brief exposure to 300°C, near-zero birefringence (< 0.001) and a maximum CTE of approximately 60 ppm/°C is disclosed. The copolyimides are prepared from alicyclic dianhydrides, aromatic cardo diamines, and aromatic diamines containing free carboxyl groups. The substrates are manufactured from solutions of the copolyimides containing multifunctional epoxides in the form of single layer films, multilayer laminates and glass fiber reinforced composite films. The substrates can be used in the construction of flexible optical displays, and other microelectronic and photovoltaic devices that require their unique combination of properties.
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Inventors:
SUN LIMIN (US)
ZHANG DONG (US)
JING JIAOKAI (US)
HARRIS FRANK W (US)
ZHANG DONG (US)
JING JIAOKAI (US)
HARRIS FRANK W (US)
Application Number:
PCT/US2012/051322
Publication Date:
May 10, 2013
Filing Date:
August 17, 2012
Export Citation:
Assignee:
AKRON POLYMER SYSTEMS INC (US)
International Classes:
B32B17/04; C08J5/18; C08G73/10; C08J5/08; C08L79/08
Domestic Patent References:
| WO2004086146A1 | 2004-10-07 |
Foreign References:
| US20110109855A1 | 2011-05-12 | |||
| US20060106193A1 | 2006-05-18 | |||
| US20090269597A1 | 2009-10-29 | |||
| US20090221777A1 | 2009-09-03 | |||
| US20100187719A1 | 2010-07-29 | |||
| US20100060834A1 | 2010-03-11 | |||
| US6074709A | 2000-06-13 |
Other References:
See also references of EP 2744851A4
Attorney, Agent or Firm:
EMERSON, Roger D. et al. (1914 Akron Peninsula RoadAkron, Ohio, US)
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