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Polyamic acid, varnish containing same, film, touch panel display, liquid crystal display, and organic el display

A technology of polyamic acid and tetracarboxylic dianhydride, applied in the direction of coating, etc., can solve the problems of flexibility, low impact resistance, high specific gravity of inorganic glass, etc., and achieve high heat resistance, less coloring, and elongation large effect

Active Publication Date: 2021-02-05
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inorganic glass has high specific gravity (weight) and low flexibility and impact resistance

Method used

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  • Polyamic acid, varnish containing same, film, touch panel display, liquid crystal display, and organic el display
  • Polyamic acid, varnish containing same, film, touch panel display, liquid crystal display, and organic el display
  • Polyamic acid, varnish containing same, film, touch panel display, liquid crystal display, and organic el display

Examples

Experimental program
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Effect test

preparation example Construction

[0155] (Preparation of polyamic acid or block polyamic acid imide)

[0156] When the polyimide to be produced is a random polymer, the above-mentioned tetracarboxylic dianhydride component and diamine component are mixed and polymerized to obtain a polyamic acid. Here, the ratio (y / x) of the total molar weight y of the tetracarboxylic dianhydride component to the total molar weight x of the diamine component during the preparation of the polyamic acid is preferably 0.9 to 1.1, more preferably 0.95 to 1.05, and further It is preferably 0.97 to 1.03, particularly preferably 0.99 to 1.01.

[0157] The polymerization method of a diamine component and a tetracarboxylic dianhydride component is not specifically limited, A well-known method can be used. For example, a container equipped with a stirrer and a nitrogen introduction pipe is prepared, and a solvent is put into the nitrogen-substituted container. And the diamine component was added so that the solid content density|conce...

Embodiment

[0194] Hereinafter, the present invention will be described in more detail by way of examples. However, the scope of the present invention is not limited thereto.

[0195] 1. Tetracarboxylic dianhydride and diamine components

[0196] The abbreviations of the tetracarboxylic dianhydride and the diamine component used in the Example and the comparative example are as follows, respectively.

[0197] [Tetracarboxylic dianhydride component]

[0198] s-BPDA: 3,3',4,4'-Biphenyltetracarboxylic dianhydride

[0199] a-BPDA: 2,3,3',4'-Biphenyltetracarboxylic dianhydride

[0200] BPAF: Fluorenylene bisphthalic anhydride

[0201] [Diamine component]

[0202] t-DACH: trans-diaminocyclohexane (trans-1,4-diaminocyclohexane)

[0203] 1,4-BAC: 1,4-Diaminomethylcyclohexane

[0204] BAFL: 9,9-bis(4-aminophenyl)fluorene

[0205] 1,5-DAN: 1,5-Diaminonaphthalene

[0206] 4,4'-DAS: 4,4'-Diaminodiphenylsulfone

Synthetic example 1

[0208] Add t-DACH: 7.19 g (0.063 mol), 1,4-BAC: 1.00 g (0.007 mol) and N-methyl-2-pyrrolidone to a flask equipped with a thermometer, a condenser, a nitrogen inlet tube, and a stirring blade (NMP) 179.4 g (corresponding to 15% by mass) was stirred in a nitrogen atmosphere to obtain a uniform solution. s-BPDA: 11.33 g (0.039 mol), a-BPDA: 4.12 g (0.014 mol), and BPAF: 8.02 g (0.017 mol) were charged into this solution in the form of powder. Salt formation. The temperature of the solution was increased, and the reaction was carried out at an internal temperature of 80° C. to 85° C. for 1 hour. As a result, a uniform solution was obtained. Thereafter, it was cooled to room temperature and aged overnight at room temperature to obtain a pale yellow viscous varnish. The intrinsic logarithmic viscosity of the obtained polyamic acid varnish: ηinh (measured by Ubbelohde's viscosity tube at a polymer concentration of 0.5g / dL, NMP, and 25°C) is 1.17dL / g, and the value obtained by an E-...

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Abstract

The purpose of the present invention is to provide: a film having high resistance, high bending strength (tensile elongation), small retardation in the thickness direction, a low linear expansion coefficient, 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 linear expansion coefficientin the range of 100-200 DEG 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 [mu]m of thickness. (iii) The glass transition temperature is 340 DEG 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%.

Description

technical field [0001] The present invention relates to a polyamic acid, a varnish containing the same, a film, and a touch panel display, a liquid crystal display, and an organic EL display using the film. Background technique [0002] Conventionally, in displays such as liquid crystal display elements and organic EL display elements, inorganic glass, which is a transparent material, has been used as a panel substrate or the like. However, inorganic glass has high specific gravity (weight) and low flexibility and impact resistance. Therefore, application of polyimide films excellent in light weight, impact resistance, processability, and flexibility to panel substrates of display devices has been studied. [0003] Here, high light transmittance is required for the panel substrate of the display device. In addition, in a display device, an image displayed on an element is observed through a panel substrate. Therefore, the panel substrate is also required to have a small r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C41/12C08G73/10
CPCB29C41/12C08J5/18C08J2379/08C08G73/1042C08G73/1082C09D179/08C08G73/1085C08G2150/00C08J2333/24
Inventor 冈崎真喜福川健一浦上达宣
Owner MITSUI CHEM INC
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