Polyamic acid, varnish containing same, film, touch panel display, liquid crystal display, and organic EL display
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United States of America Patent
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Apr 2, 2024
Grant Date -
Aug 26, 2021
app pub date -
Jun 20, 2019
filing date -
Jun 22, 2018
priority date (Note) -
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Abstract
The purpose of the present invention is to provide: a film having high thermal stability, high bending strength (tensile elongation), small retardation in the thickness direction, a low coefficient of thermal expansion, and high transparency; and a polyamic acid or varnish for obtaining the film. The film satisfies all of requirements (i)-(vi) below. (i) The average value of the coefficient of thermal expansion in the range of 100-200° C. is 35 ppm/K or less. (ii) The absolute value of the retardation in the thickness direction is 200 nm or less per 10 μm of thickness. (iii) The glass transition temperature is 340° C. or higher. (iv) The total light transmittance is at least 85%. (v) The b* value in the L*a*b* color system is 5 or less. (vi) The tensile elongation is at least 10%.
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