Stretched film and method for producing stretched film

A manufacturing method and film technology, applied in chemical instruments and methods, flat products, polarizing elements, etc., can solve problems such as increased shrinkage, and achieve the effects of small dimensional change rate, excellent bonding strength, and excellent mechanical properties

Active Publication Date: 2019-09-20
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] According to research by the inventors of the present invention, it has been found that by blending acrylic rubber particles, the mechanical properties can be improved, but there is a problem that the shrinkage rate increases in a high-temperature and high-humidity environment

Method used

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  • Stretched film and method for producing stretched film
  • Stretched film and method for producing stretched film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0203] A mixture containing 10% by weight of the acrylic resin (A1) and acrylic rubber pellets (B1) produced in the above-mentioned acrylic resin production example was used with an intermeshing type co-rotating twin-screw extruder (L / D =30) for kneading. The resin mixture was supplied from a hopper at 2 kg / hour, the set temperature of each temperature control zone of the extruder was set to 260° C., and the screw rotation speed was set to 100 rpm. The resin that came out as strands from the die provided at the exit of the extruder was cooled in a water tank, and then pelletized with a pelletizer to obtain an acrylic resin composition (C1).

[0204] After drying the obtained acrylic resin composition (C1) at 100° C. for 5 hours, an intermeshing type co-rotating twin-screw extruder (L / D=30) with a diameter of 15 mm equipped with a T-die at the exit of the extruder was used. Make a film. The acrylic resin composition (C1) was supplied from a hopper at 2 kg / hour, the set temper...

Embodiment 2

[0217] A biaxially stretched film was obtained in the same manner as in Example 1, except that the original reverse film (D1) was simultaneously biaxially stretched at a temperature 26° C. higher than the glass transition temperature. The shrinkage rate, peel strength, and number of times of MIT reciprocating bending were measured according to the above-mentioned method. The results are shown in Table 1. Furthermore, the internal haze was measured and found to be 0.18.

Embodiment 3

[0219] A biaxially stretched film was obtained in the same manner as in Example 1, except that the original reverse film (D1) was simultaneously biaxially stretched at a temperature 31° C. higher than the glass transition temperature. The shrinkage rate, peel strength, and number of times of MIT reciprocating bending were measured according to the above-mentioned methods. The results are shown in Table 1. Furthermore, the internal haze was measured and found to be 0.19.

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Abstract

Provided are: a stretched film having excellent heat resistance, dimensional stability, mechanical properties, and adhesiveness; and a method for producing a stretched film. The present invention relates to: a stretched film containing acrylic rubber particles and an acrylic resin having a glass transition temperature of 120DEG C or higher, the stretched film being characterized by having a shrinkage rate of 1.5% or less when left standing at 85DEG C and 85% RH for 120 hours, and having an endurable number of cycles, by MIT flex test, of 350 times or more; and a method for producing a stretched film.

Description

technical field [0001] The present invention relates to a stretched film which can be used for optical films and the like and a method for producing the stretched film. Background technique [0002] A large number of optical films are used in liquid crystal display devices. In a liquid crystal display device, two polarizers are usually arranged on both sides of a liquid crystal cell. As a polarizing plate, a polarizer in which a polarizer protective film for protecting the polarizer is attached to both sides of the polarizer with an adhesive is generally used. As the polarizer protective film, a highly transparent optical film is used. Optical films made of cellulose-based materials are often used, and the use of optical films made of acrylic resins as polarizer protective films has been proposed in order to improve durability and the like (for example, Patent Documents 1 and 2). However, these acrylic resin films may have insufficient mechanical properties, especially fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/16C08J5/18C08L33/06C08L51/06G02B5/30B29K21/00B29K33/04B29L7/00
CPCB29C55/005B29C55/14B29C55/16B32B27/308C08J5/18C08L33/06C08L51/06G02B1/08G02B1/14G02B5/3083C08J2333/00C08J2451/00B29K2021/00B29K2033/04B29L2007/002B29K2035/00
Inventor 岛田健一郎桝田长宏片冈直人
Owner KANEKA CORP
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