Polyamic acid, varnish containing same, and polyimide film
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United States of America Patent
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-
Jan 2, 2018
Issued Date -
N/A
app pub date -
Apr 1, 2014
filing date -
Apr 4, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention addresses the problem of providing a high-transparency polyimide film in which the thickness-direction phase difference Rth is kept within a predetermined range. The present invention also addresses the problem of providing a polyamic acid and a varnish used to obtain the polyimide film. In order to overcome the aforementioned problem, the present invention is a polyimide film containing a polyimide obtained by bringing about a reaction between a tetracarboxylic dianhydride and a diamine, the polyimide film having (a) a thickness-direction phase difference Rth of −5 to 100 nm per 10 μm of thickness, (b) a transmittance of 80% or more with respect to light having a wavelength of 400 nm, (c) a haze of 3% or less, and (d) a glass transition point of 250° C. or higher.
First Claim
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Family
International Classification(s)
- C08J:WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTE....
- C08G:MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN B....
- B29C:SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTAN....
- C09D:COATING COMPOSITIONS, e.g. PAINTS, VARNISHES, LACQ....
- B29K:INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, ....
- B29L:INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RE....
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- C08J Class
- 0 % this patent is cited more than
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