Method of manufacturing a diffusely-reflecting polarizer having a nearly isotropic continous phase

A technology of polarizer and diffuse reflection, which is applied in the direction of diffusion elements, polarizing elements, instruments, etc., and can solve the problems of limited use

Inactive Publication Date: 2012-07-25
SKC HAAS DISPLAY FILMS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this film has limited use in optical applications where optical diffusion is desired

Method used

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  • Method of manufacturing a diffusely-reflecting polarizer having a nearly isotropic continous phase
  • Method of manufacturing a diffusely-reflecting polarizer having a nearly isotropic continous phase
  • Method of manufacturing a diffusely-reflecting polarizer having a nearly isotropic continous phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0061] Diffuse reflective polarizers according to the invention are made by extruding a mixture of a first polymeric phase and a second polymeric phase. The dry component mixture is fed into the single screw extruder at the desired composition. The mixture was coextruded through a multi-manifold die with protective layers on both sides of a film of the immiscible mixture comprising the two phases described above. After exiting the die, the cast sheet passes through a three-roll stack including a pair of calender rolls to improve its surface quality. After casting, the total thickness of the flakes was about 800 microns, and the total thickness of the protective layer was about 1 / 4 of the total thickness of the flakes. The three-layer cast sheet is then stretched in the machine direction to induce birefringence in the birefringent disperse phase.

[0062] The sheet is first heated to the nominal stretching temperature T s, and then stretched by a factor of 3 to 5 in a uniaxi...

example 1

[0070] Example 1: Pure continuous phase polymer Topas 8007, SB, Zylar 631, PETG 6763 and PCTG 5445 were coextruded with PET or PEN protective layer and stretched under the same conditions as the mixture including continuous phase and dispersed phase, That is, the same stretching temperature and stretching ratio are used. The epidermis is then peeled off. The refractive index n at a wavelength of 633 nm of each core layer composed of a pure amorphous polymer was then measured using a Metricon prism coupler 2010 from Metricon Corporatopm. para , n perp and n z . Refractive index n para , n perp and n z Corresponding to the direction parallel to stretching, perpendicular to the direction of stretching, and along the thickness direction of the sheet, respectively. In all three refractive indices n perp and n z are very close to each other, the difference between the two of them is less than 0.02, and in most cases the difference is less than 0.005. Refractive index n of ...

Embodiment 2

[0071] Example 2: 70% by weight of Zylar 631 is used as the continuous phase polymer, 30% by weight of PEN is used as the dispersed phase polymer, the protective layer is PEN, and stretched 5 times along the direction of the extruded film at a temperature of 125°C. The sample had a FOM value of 1.66, a total reflectance of 83%, a diffuse reflectance of 71%, and a specular reflectance of 12% (all measured at 550nm).

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Abstract

The present invention provides a method for manufacturing a diffusely reflecting polarizer, comprising the steps of: coextruding first and second polymers through a chaotic mixer and a sheeting die to produce a cast sheet with a desired blend morphology and stretching said cast sheet to produce a composite film containing a first polymer having a birefringence of less than 0.02, with said first polymer being an amorphous material and a continuous phase, and a second polymer which forms a dispersed phase, and having an index of refraction that differs from said continuous phase by greater than about 0.05 along a first axis and by less than about 0.05 along a second axis orthogonal to said first axis, wherein said first and second polymers taken together along a first axis for one polarization state of electromagnetic radiation exhibit a diffuse reflectivity R 1d , a specular reflectivity R 1s , a total reflectivity R 1t , a diffuse transmittance T 1d , a specular transmittance T 1s , and a total transmittance T 1t , and along a second axis for another polarization state of electromagnetic radiation exhibit a diffuse reflectivity R 2d , a specular reflectivity R 2s , a total reflectivity R 2t , a diffuse transmittance T 2d , a specular transmittance T 2s , and a total transmittance T 2t , the said first and second axes being orthogonal, wherein the parameters of composition, chaotic mixing, stretch temperature and stretch ratio for the process and Tg, and refractive index of the first and second polymers are selected to satisfy the equations: R 1 d is greater than R 1 s ; T 2 t / 1 - 0.5 R 1 t + R 2 t > 1.35.

Description

technical field [0001] The present invention relates to a diffuse reflective polarizer comprising a film having a first continuous phase and a second dispersed phase, the continuous phase being amorphous and nearly optically isotropic, and the manufacture of such a diffuse Reflective polarizer approach. technical background [0002] A reflective polarizing film transmits light of one polarization and reflects light of a polarization perpendicular to that polarization. They are used in LCDs to enhance light efficiency. A series of films have been disclosed to achieve the effect of reflective polarizing films, among which diffuse reflective polarizers are more attractive because their use eliminates the need for diffusers in LCDs, which reduces the LCD's Complexity. U.S. Patent Nos. 5,783,120 and 5,825,543 teach a diffusely reflective polarizing film comprising a film comprising an immiscible mixture having a first continuous phase (also referred to herein as the main phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/00B29C47/00B29C55/02G02B5/30G02B1/04G02B1/10
CPCG02B5/3008B29D11/00798B29D11/00644G02B5/02G02B5/08G02F1/1335
Inventor J·格林纳J·多利X-D·米
Owner SKC HAAS DISPLAY FILMS CO LTD
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