Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Optical film

An optical film, polyamide-imide technology, applied in the field of optical film, can solve the problems of easy cracking and difficult front panel material utilization, and achieve the effect of high elastic modulus

Pending Publication Date: 2019-11-05
SUMITOMO CHEM CO LTD
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the front panel of such an image display device, glass is used, but glass is very rigid and easily cracked, so it is difficult to use it as a front panel material such as a flexible display.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical film
  • Optical film
  • Optical film

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0127] The solvent usable in the preparation of the varnish is not particularly limited as long as it can dissolve the aforementioned resin. Examples of the solvent include amide-based solvents such as N,N-dimethylacetamide and N,N-dimethylformamide; lactone-based solvents such as γ-butyrolactone and γ-valerolactone; Sulfur-containing solvents such as dimethyl sulfone, dimethyl sulfoxide, and sulfolane; carbonate-based solvents such as ethylene carbonate and 1,2-propylene carbonate; and combinations thereof. Among these, amide-based solvents or lactone-based solvents are preferable. These solvents can be used individually or in combination of 2 or more types. In addition, water, alcohol-based solvents, ketone-based solvents, acyclic ester-based solvents, ether-based solvents, and the like may be contained in the varnish. The solid content concentration of the varnish is preferably 1 to 25% by mass, more preferably 5 to 15% by mass.

[0128] In the coating step, the varnish ...

Embodiment 1

[0230] (Preparation of silica sol)

[0231] In a 1000 mL flask, 517.2 g of methanol-dispersed silica sol (“MA-ST-M” manufactured by Nissan Chemical Industries, Ltd., primary particle size: 23 nm, solid content of silica particles: 40.6%) and γ-butylene Lactone (GBL) 490.9g, methanol was evaporated at 400hPa for 1 hour at 400hPa, and methanol was evaporated at 250hPa for 1 hour in a hot water bath at 45°C using a vacuum evaporator. Furthermore, the temperature was raised to 70° C. at 250 hPa, and heating was performed for 30 minutes to obtain γ-butyrolactone-dispersed silica sol 1 (GBL-dispersed silica sol 1). The solid content concentration of the obtained GBL-dispersed silica sol 1 was 29.8%.

[0232] (Preparation of polyamideimide)

[0233]Under a nitrogen atmosphere, 45 g (140.52 mmol) of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl (TFMB) and N , N-dimethylacetamide (DMAc) 768.55g, TFMB was dissolved in DMAc while stirring at room temperature. Next, 18.92 g (42.58 mm...

Embodiment 2

[0239] Instead of methanol-dispersed silica sol "MA-ST-M", methanol-dispersed silica sol (manufactured by Nissan Chemical Industries, Ltd., "MA-ST-G-ML1", primary particle size: 27nm) was used, and in addition, the same In the same manner as in Example 1, an optical film was obtained.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

An object of the present invention is to provide an optical film capable of simultaneously achieving low yellowness (ZI value) and high elastic modulus. The solution of the present invention is an optical film comprising a polyamideimide resin. When the cross section of the membrane was measured by time-of-flight secondary ion mass spectrometry, the intensity ratio (A / B) of the methoxyl ion intensity (A) to the silicon ion intensity (B) was greater than or equal to 0.02.

Description

technical field [0001] The present invention relates to an optical film usable as a front panel of an image display device, a method for producing the same, and a flexible image display device including the optical film. Background technique [0002] Image display devices such as liquid crystal display devices and organic EL display devices have been widely used in various applications such as mobile phones and smart watches. Glass is used as a front panel of such an image display device, but glass is very rigid and easily cracked, so it is difficult to use it as a front panel material such as a flexible display, for example. As one of the materials which replace glass, there is a polyimide resin, and the optical film using these resins is researched (for example, patent document 1). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: International Publication No. 2017 / 119450 Contents of the invention [0006] The problem to be solved by...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G02B1/04G02B1/14G09F9/30C08L79/08C08K3/36C08J5/18
CPCG02B1/04G02B1/14G09F9/301C08J5/18C08J2379/08C08K3/36G02B5/30G02F1/1335
Inventor 真锅佳久有村孝
Owner SUMITOMO CHEM CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com