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Polyimide film and manufacturing method thereof

A technology of polyimide film and manufacturing method, which is applied to flat products, other household appliances, coatings, etc., which can solve the problems of planarity deterioration, haze deviation, and easy increase of film haze, so as to achieve easy orientation and deviation Small size and good transportability

Active Publication Date: 2021-10-29
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the case of polyimide films, when they are lengthened and wound into rolls, sticking between films occurs, so there are problems such as deterioration of conveyability, or generation of surface defects and deterioration of planarity.
[0007] In order to prevent sticking, it is considered to add inorganic fine particles to improve the slipperiness, but when adding inorganic fine particles to the polyimide film, there is a problem that the haze of the film tends to increase compared with other resins. Not suitable for use
[0011] However, in the case of mixing inorganic fine particles with a soluble polyimide film to produce a long-sized coil, it was found that there was a problem that the haze value was varied in the surface direction of the film and the standard deviation of the haze value became large. Such problems specific to membranes made using soluble polyimide

Method used

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  • Polyimide film and manufacturing method thereof
  • Polyimide film and manufacturing method thereof
  • Polyimide film and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0461] The structures of the compounds used in the examples are listed below.

[0462] [chem 22]

[0463]

[0464] Anhydride A: Bicyclo[4.2.0]octane-3,4,7,8-tetracarboxylic dianhydride

[0465] Diamine compound B: 2,2′-dimethylbiphenyl-4,4′-diamine

[0466] In addition, the commercially available sources of the above-mentioned compounds are as follows.

[0467] Anhydride 1: Daikin Industries, Ltd.

[0468] Anhydride 2: Manac Co., Ltd.

[0469] Anhydride 3: Daicel Co., Ltd.

[0470] Diamine 1: Daikin Industries, Ltd.

[0471] Diamine 2: Mitsui Chemicals Fine Co., Ltd.

[0472] Diamine 6: Wakayama Seika Co., Ltd.

[0473] Diamine compound B: Showa Chemical Co., Ltd.

[0474]

[0475] (Preparation of polyimide solution A)

[0476] In a 4-neck flask equipped with a dry nitrogen introduction tube, a cooler, a Dean-Stark condenser filled with toluene, and a stirrer, 17.87 g (57.6 mmol) of the above-mentioned acid anhydride 2 (manufactured by Manac Co., Ltd.) was added ...

Embodiment 2

[0566] About the polyimide film 101 and the polyimide film 109 of Example 1, bending resistance was evaluated as follows.

[0567] (bending resistance)

[0568] The produced polyimide film was subjected to a bending resistance test (sliding bending test) using a bending fatigue tester prescribed in JIS C5016. In addition, under the conditions of a bending radius of 2.5mm, a bending speed of 2000 times / min, and a bending stroke of 25mm, bending was repeated in one direction so that the wiring formation surface was turned outward during bending, and the value was obtained until it was positioned outside the bending direction. The number of bending times (bending resistance) of the wiring breakage.

[0569] ◎: more than 5000 times

[0570] ○: More than 1000 times and less than 5000 times

[0571] ×: Less than 1000 times

[0572] Table 3 shows the evaluation results of bending resistance.

[0573]

[0574] As shown in Table 3, it turned out that the polyimide film of this ...

Embodiment 3

[0576] In the preparation of the main dope in the production of the polyimide film 101 of Example 1, except that the following mixing dope 301A was added instead of the crushed product 101A so as to become the mixture mass ratio shown in Table 4, The polyimide film 301 similar to the polyimide film 101 was produced.

[0577] (Preparation of mixing glue 301A)

[0578] (Preparation of polyimide solution 301A)

[0579] In a 4-neck flask equipped with a dry nitrogen introduction tube, a cooler, a Dean-Stark condenser filled with toluene, and a stirrer, 17.87 g (57.6 mmol) of the above-mentioned acid anhydride 2 (manufactured by Manac Co., Ltd.) was added to N,N-2 Methylacetamide (134 g) was stirred at room temperature under a nitrogen stream.

[0580] 11.53 g (60 mmol) of the above-mentioned diamine 2 (manufactured by Mitsui Chemicals Fine Co., Ltd.) was added thereto, and it heated and stirred at 80 degreeC for 6 hours. Then, the external temperature was heated to 190° C., and...

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Abstract

The subject of this invention is providing the polyimide film which conveyability is favorable and the variation of the haze value in the surface direction of a film is small. Moreover, the manufacturing method of this polyimide film is provided. The method for producing a polyimide film of the present invention is a polyimide film containing at least 1 g of polyimide and inorganic fine particles dissolved in 100 g of dimethylacetamide or 100 g of γ-butyrolactone at 60°C The production method of the present invention is characterized in that it includes: a step of preparing a mixture containing the above-mentioned polyimide and the above-mentioned inorganic fine particles, a step of preparing a dope containing the above-mentioned mixture, the above-mentioned polyimide and a solvent, and placing the dope on a support A step of forming a film by casting on a body, a step of peeling the film from the support, and a drying step of drying the peeled film.

Description

technical field [0001] The present invention relates to a polyimide film and a method for producing the same. More specifically, it relates to a polyimide film having good conveyability and a small variation in the haze value in the plane direction, and a method for producing the same. Background technique [0002] Image display devices continue to increase in size. In particular, in recent years, television receivers have been increased in size, and television receivers that can be bent to be carried into a room, and television receivers that can be rolled up and stored when not in use (flexible television receivers) are required. In addition, the demand for curved television receivers (curved televisions) is also increasing. [0003] Furthermore, there is an increasing demand for a foldable image display device for portable use as a medium-sized image display device or a small-sized image display device for mobile use. Therefore, it is necessary to make the image display...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18B29C41/24C08L79/08B29K79/00B29L7/00
CPCB29C41/24C08J5/18C08L79/08C08L2207/20C08K3/013
Inventor 伊藤康敏南条崇
Owner KONICA MINOLTA INC
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