Unlock instant, AI-driven research and patent intelligence for your innovation.

Raw material film, stretched optical film manufacturing method, and stretched optical film

A technology of optical film and original material film, which is applied in the direction of optical elements, flat products, polarizing elements, etc., and can solve the problems of cracking of polarizing film, high cost, cracking of polarizing film, etc.

Active Publication Date: 2020-02-18
KURARAY CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thin original film tends to be cracked along the stretching direction due to the drying process during the production of the polarizing film, the process of laminating the obtained polarizing film and the protective film, etc.
In addition, when the polarizing film is thin, when the polarizing film or the polarizing plate is punched or cut, the polarizing film is likely to be cracked along the stretching direction or fine cracks are easily generated on the end surface of the polarizing film.
Therefore, when using a thin raw material film, the productivity and yield of polarizing plates and LCDs are lowered, which tends to increase the cost
In this way, the thinning of the original film and the polarizing film will reduce the productivity and yield, which will easily lead to an increase in cost
In addition, stretched optical films such as retardation films other than polarizing films are also expected to be thinner, but they also have disadvantages such as easy occurrence of cracks.

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
  • Raw material film, stretched optical film manufacturing method, and stretched optical film
  • Raw material film, stretched optical film manufacturing method, and stretched optical film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0131] The raw material film, the stretched optical film, and the manufacturing method of the stretched optical film of this invention are not limited to the said embodiment. For example, although the case where a stretched optical film is a polarizing film was mainly demonstrated as a stretched optical film and its manufacturing method, a stretched optical film is not limited to a polarizing film. For example, stretched optical films other than polarizing films, such as retardation films, are also within the scope of the present invention, and can be produced by a production method including a step of stretching the original film of the present invention. The manufacturing method of the retardation film which is one Embodiment of this invention can be performed using a conventionally well-known method except stretching the original film of this invention.

Embodiment

[0133] The following examples illustrate the present invention concretely, but the present invention is not limited to these examples at all. In addition, each evaluation method employed in the following examples and comparative examples is as follows.

[0134] [Glass transition temperature of resin pellets]

[0135] After dissolving the original film obtained in each of the following Examples or Comparative Examples in water, it was filtered with a filter capable of trapping resin particles (“MF-Millipore Menbrunn Filter VSWP” from Merck, pore size: 0.025 μm) , and dry the trap (resin particles). Thereafter, the resin pellets were heat-treated at 100° C., thereby collecting a resin film formed of only the resin pellets. The glass transition temperature of the resin film was calculated|required using DSC ("Q2000" of TA Instruments company). Let this be the glass transition temperature of the resin particle.

[0136] [Swelling degree of original film]

[0137] About 1.5 g ...

manufacture example 1

[0168] [Manufacture Example 1] Manufacture of resin pellet A

[0169] Into a dry 0.5 L pressure-resistant polymerization tank, 0.20 g of potassium persulfate as a polymerization initiator, 36.0 g of a reactive emulsifier "JS-20" of Sanyo Chemical Industry Co., Ltd., and 300 g of ion-exchanged water were charged. This was deoxidized by bubbling nitrogen gas for 30 minutes to obtain a starting emulsion. Next, after raising the temperature of the initial emulsion to 60° C. while stirring, 45.0 g of n-butyl acrylate, 0.45 g of allyl methacrylate and trihydroxyl acrylate degassed were added continuously at a rate of 1.0 ml / min. A mixed solution of 0.23 g of methylpropane trimethacrylate.

[0170] Thereafter, when it was confirmed that the conversion rate of each monomer calculated by the method described later exceeded 95% by mass, 5.6 g of degassed dicyclopentanyl methacrylate was continuously added at a rate of 1.0 ml / min. After the above-mentioned addition, it was confirmed th...

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
Puncture strengthaaaaaaaaaa
Puncture strengthaaaaaaaaaa
Puncture strengthaaaaaaaaaa
Login to View More

Abstract

The present invention provides a raw material film with which a stretched optical film that is thin and not easily torn can be relatively easily obtained, the stretched optical film that is thin and not easily torn, and a stretched optical film manufacturing method by which this stretched optical film can be relatively easily obtained. The present invention is a raw material film for manufacturinga stretched optical film, the raw material film having an average thickness of 45 microns or less, and containing a vinyl alcohol-based polymer as a main component, and resin particles with a glass transition temperature of 30 DEG C or lower, wherein the content of the resin particles relative to 100 parts by mass of the vinyl alcohol-based polymer is 1-50 parts by mass inclusive.

Description

technical field [0001] The present invention relates to a raw film (raw film), a method for producing a stretched optical film, and a stretched optical film. Background technique [0002] Polarizing plates with light-transmitting and light-shielding functions are the same basic components of liquid crystal displays (LCDs) as are liquid crystals that change the polarization state of light. Various polarizing plates have a structure in which a protective film such as a triacetate cellulose (TAC) film is bonded to the surface of a polarizing film. As the polarizing film constituting the polarizing plate, a vinyl alcohol-based polymer film (hereinafter, "vinyl alcohol-based polymer" may be abbreviated as "PVA") is uniaxially stretched and oriented. (I 3 - , I 5 - etc.), dichroic dyes such as dichroic organic dyes have become mainstream. This kind of polarizing film is obtained by uniaxially stretching a PVA film containing a dichroic dye in advance, or by absorbing a dichr...

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): G02B5/30B29C55/04C08J5/18B29K29/00B29L7/00B29L11/00
CPCB29C55/04C08J5/18G02B5/30
Inventor 川崎绘美川崎雅洋大桥亘稻富敦矶崎孝德久保敬次
Owner KURARAY CO LTD