Polyamic acid, and thermosetting composition, cured film and liquid crystal display element using same

A polyamic acid, thermosetting technology, applied in the field of electronic parts, can solve the problem of few reports, etc., and achieve the effect of suppressing corrosion, high voltage retention rate, and high transmittance

Pending Publication Date: 2022-07-26
JNC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] On the other hand, there are very few reports on compositions having both alignment and planarization capabilities.
Although a thermosetting composition containing an aromatic polyamic acid has been reported (Patent Document 2), there is still room for improvement in the flatness and voltage retention of the cured film obtained from the composition

Method used

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  • Polyamic acid, and thermosetting composition, cured film and liquid crystal display element using same
  • Polyamic acid, and thermosetting composition, cured film and liquid crystal display element using same
  • Polyamic acid, and thermosetting composition, cured film and liquid crystal display element using same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0119] 2-4. Preparation of thermosetting composition

[0120] The thermosetting composition of the present invention can be obtained by selectively adding a polyamic acid (A), a solvent (B2), a curing agent (C) as needed, a compound having a polymerizable double bond, a surfactant, Additives (D) such as adhesion improvers, antioxidants, and other additives are uniformly mixed and dissolved.

[0121] 2-5. Storage of thermosetting composition

[0122] When the thermosetting composition of the present invention is stored in the range of -30°C to 25°C, the stability over time of the composition becomes favorable, which is preferable. More preferably, it is -20 degreeC - 10 degreeC.

[0123] 3. Cured film obtained from thermosetting composition

[0124] A coating film can be formed by applying the thermosetting composition prepared as described above to the surface of a substrate by conventionally known coating methods such as spin coating, roll coating, dipping, and slit coatin...

Embodiment

[0129] Next, the present invention will be specifically described with reference to Synthesis Examples, Examples, and Comparative Examples, but the present invention is not limited to these Examples at all.

[0130] About the abbreviations described in the Examples, the corresponding compound names, trade names, etc. are described below.

[0131]

[0132] GBL: gamma-butyrolactone

[0133] ECa: Diethylene glycol monoethyl ether acetate

[0134] BCS: Ethylene Glycol Monobutyl Ether

[0135] PGME: Propylene Glycol Monomethyl Ether

[0136] EDM: Diethylene glycol ethyl methyl ether

[0137] 3MP: methyl 3-methoxypropionate

[0138]

[0139] BT-100: 1,2,3,4-butane tetracarboxylic dianhydride (Rikacid BT-100; trade name; New Japan Chemical Co., Ltd.)

[0140] ODPA: 3,3',4,4'-diphenyl ether tetracarboxylic dianhydride

[0141]

[0142] DDS: 4,4'-diaminodiphenylsulfone

[0143] 1,3-BAC: 1,3-bisaminomethylcyclohexane

[0144] NBDA: Bis(aminomethyl)norbornane (trade name; M...

Synthetic example 1

[0193] [Synthesis example 1] Synthesis of polyamic acid (A1)

[0194] At room temperature, BT-100 (27.94 g; 141.02 mmol), 1,3-BAC (20.06 g; 141.02 mmol) and GBL ( 144.00g). The reaction vessel was heated in an oil bath maintained at 85° C. for 2 hours, and it was confirmed that the contents in the reaction vessel were dissolved. After cooling to room temperature, BCS (48.00 g) was added, and the mixture was further stirred at 85°C for 5 hours. It cooled to room temperature, and obtained the solution of the uniform transparent polyamic acid (A1) whose solid content density|concentration is 20.0%. Mw of the polyamic acid (A1) was 10,700, and Mn was 9,900. The solution (hereinafter referred to as SA1) was directly used for the preparation of the thermosetting composition.

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Abstract

The invention provides a polyamide acid soluble in a mild solvent, and a thermosetting composition, a hardened film and a liquid crystal display element using the polyamide acid. Also provided is a thermosetting composition which uses the polyamic acid according to the present invention and has the ability to align liquid crystals and polymerizable liquid crystals and the ability to flatten a substrate. Also provided is a cured film which contains the thermosetting composition and imparts high transmittance and high voltage holding ratio. Also provided is an electronic component such as a liquid crystal display element or a solid-state imaging element having the cured film. A polyamic acid obtained by reacting raw materials including an aliphatic tetracarboxylic dianhydride having a specific structure and an aliphatic diamine having a specific structure. And a thermosetting composition using the polyamic acid.

Description

technical field [0001] The present invention relates to a mild-solvent-soluble polyamic acid, a thermosetting composition containing the polyamic acid in which the corrosion of color filters is suppressed, and a compatible compound containing the thermosetting composition A cured film having orientation ability and planarization ability, and electronic components such as a liquid crystal display element or a solid-state imaging element having the cured film. Background technique [0002] A retardation film is arranged in a liquid crystal display device for the purpose of widening the viewing angle, adjusting the color tone of an image, and the like. As such a retardation film, a stretched polymer film or a coating-type cured film containing a polymerizable liquid crystal composition can be used. Compared with the conventional polymer film, the coating-type cured film containing a polymerizable liquid crystal composition can achieve thinning of a liquid crystal display devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J5/18C08L79/08G02F1/1337
CPCC08G73/1007C08G73/1042C08G73/1082C08J5/18G02F1/133723C08J2379/08
Inventor 安井平藤马佐知子渡边尚树
Owner JNC CORP
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