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US 9,850,346 B2Granted
Transparent polyimide and precursor thereof
AssigneeMitsui Chemicals, Inc.
InventorsKenichi Fukukawa, Masaki Okazaki, Yoshihiro Sakata, Tatsuhiro Urakami, Atsushi Okubo
Life of this patent
Estimating the term…
Abstract
Provided is a polyimide excellent in heat resistance and colorless transparency and also excellent in flexibility and ultraviolet ray transmittance. The polyimide includes a structural unit represented by Formula (1a) and a structural unit represented by Formula (1b) wherein R is a specific aromatic group.
Claims13
A polyimide comprising a structural unit represented by Formula (1a) and a structural unit represented by Formula (1b),
- wherein in Formulae (1a) and (1b), R is a group represented by Formula (x1), (x2) or (x3),
- wherein in Formulae (x1), (x2) and (x3), * is a carbon atom bonding to a carbon atom of C═O adjacent to R, and when plural Rs are contained, those groups may be the same or different from each other,
- m is a molar ratio of the structural unit represented by Formula (1a) relative to the total of the structural unit represented by Formula (1a) and the structural unit represented by Formula (1b), n is a molar ratio of the structural unit represented by Formula (1b) relative to the total of the structural unit represented by Formula (1a) and the structural unit represented by Formula (1b) (m+n=100%) wherein m/n ranges from 99.9/0.1 to 50.0/50.0, the structural unit represented by Formula (1a) and the structural unit represented by Formula (1b) are bonded to each other, and the bonding form is random,
- a cyclohexane skeleton (y) in Formula (1a) comprises 60% to 100% of a trans isomer represented by Formula (y1) and 40% to 0% of a cis isomer represented by Formula (y2) wherein the trans isomer and the cis isomer total 100%, and
- a 1,4-bismethylenecyclohexane skeleton (z) in Formula (1b) comprises 60% to 100% of a trans isomer represented by Formula (z1) and 40% to 0% of a cis isomer represented by Formula (z2) wherein the trans isomer and the cis isomer total 100%
2 more elements
A polyamic acid comprising a structural unit represented by Formula (2a) and a structural unit represented by Formula (2b),
- wherein in Formula (2a) and (2b), R is a group represented by Formula (x1), (x2) or (x3),
- wherein in Formulae (x1), (x2) and (x3), * is a carbon atom bonding to a carbon atom of C═O adjacent to R, and when plural Rs are contained, those groups may be the same or different from each other,
- m is a molar ratio of the structural unit represented by Formula (2a) relative to the total of the structural unit represented by Formula (2a) and the structural unit represented by Formula (2b), n is a molar ratio of the structural unit represented by Formula (2b) relative to the total of the structural unit represented by Formula (2a) and the structural unit represented by Formula (2b) wherein m/n ranges from 99.9/0.1 to 50.0/50.0, the structural unit represented by Formula (2a) and the structural unit represented by Formula (2b) are bonded to each other, and the bonding form is random,
- a cyclohexane skeleton (y) in Formula (2a) comprises 60% to 100% of a trans isomer represented by Formula (y1) and 40% to 0% of a cis isomer represented by Formula (y2) wherein the trans isomer and the cis isomer total 100%, and
- a 1,4-bismethylenecyclohexane skeleton (z) in Formula (2b) comprises 60% to 100% of a trans isomer represented by Formula (z1) and 40% to 0% of a cis isomer represented by Formula (z2) wherein the trans isomer and the cis isomer total 100%
2 more elements
Dependencies are inferred from the claim text.