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

Release film

A release film and release technology, applied in electronic equipment, applications, coatings, etc., can solve the problem of difficult to find polarizers, their missed inspections, etc., to improve the accuracy of foreign matter inspection, less bright spots, and high industrial value.

Active Publication Date: 2011-01-12
MITSUBISHI CHEM CORP
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, since the polarizing plate installed under it is inspected through the release film, if the release film is extremely white, it may be difficult to find defects in the polarizing plate, and it may be easy to miss inspections.

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
  • Release film
  • Release film
  • Release film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited to the following examples unless the gist thereof is exceeded. However, "parts" in Examples and Comparative Examples means "parts by weight". In addition, the measuring method used in this invention is as follows.

[0057] (1) Determination of intrinsic viscosity of polyester

[0058] 1 g of polyester was accurately weighed, dissolved in 100 ml of a mixed solvent of phenol / tetrachloroethane=50 / 50 (weight ratio), and measured at 30°C.

[0059] (2) Average particle size (d50)

[0060] The particle diameter at which the cumulative volume percentage is 50% in the equivalent spherical distribution measured using a centrifugal sedimentation type particle size distribution analyzer (SA-CP3 type) manufactured by Shimadzu Corporation was defined as the average particle diameter d50.

[0061] (3) Measurement of variation of orientation angle in film (deg...

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
surface roughnessaaaaaaaaaa
peel strengthaaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

Disclosed are release films comprising a polyester film that, in inspecting a polarizing plate by a cross Nicol method, can realize a highly accurate inspection without problems that foreign matters or defects cannot be observed without difficulties or are likely to be missed. (i) A release film for a polarizing plate, characterized in that the release film comprises a polyester film provided on one side thereof with a release layer provided by a coat-stretching method and has a film haze of 7 to 18% and an L value of not more than 77 as measured from the release layer surface side by a reflection method. (ii) A release film for a polarizing plate, characterized in that the release film comprises a polyester film provided on one side thereof with a release layer provided by a coat-stretching method and has a film surface roughness (Ra) of 11 to 25 nm and an image clarity value of not less than 90%.

Description

technical field [0001] The present invention relates to a release film for liquid crystal display applications, etc., which has excellent optical properties and can detect defects with high precision in a film inspection process, and is particularly suitable for use in polarizing plate applications. Background technique [0002] Polyester films represented by polyethylene terephthalate and polyethylene naphthalate have excellent mechanical strength, dimensional stability, flatness, heat resistance, chemical resistance, optical properties, etc. characteristics, and excellent cost performance, so it is used in various purposes. However, as the application diversifies, the processing conditions and usage conditions of the film diversify. In the release film for polarizing plates, during the inspection of foreign matter, the particle components in the polyester film constituting the release film may become bright spots, Defective conditions such as a decrease in inspection accu...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B27/00B32B27/36G01N21/88G02F1/1335
CPCB32B27/08G01N21/88B32B27/36B32B27/16B32B27/18B32B27/20B32B2250/244B32B2255/10B32B2255/26B32B2264/02B32B2264/10B32B2264/102B32B2264/104B32B2307/40B32B2307/412B32B2307/514B32B2307/748B32B2457/202Y10T428/24355Y10T428/31786
Inventor 井崎公裕椚原一弘藤田真人
Owner MITSUBISHI CHEM CORP
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