PURE-ACE®
１．Features of PURE-ACE®

Due to the remarkable development of information terminal equipment in recent years, the wave of wide-area communication, which was further released from the constraint of time and space, is surging.

Following this trend, the use of polymer optical film as a display material is steadily expanding. With the arrival of the new century, the technological development of optoelectronics accelerates its speed, and in the field related to flat panel display (FPD), the further improvement of performance and the excellent cost performance of optical film are required.

Teijin Chemicals has consistently promoted the technological development of the casting method of polycarbonate film, on the basis of its own raw materials.

As one of our achievements, “PURE-ACE®” appeared in April 1997, as optically isotropic film for LCD plastic cell substrate, in which the strictest optical quality and transparency are required. After that, in 2000, “PURE-ACE®WR” in which broadband wavelength dispersion function was added to the polymer was commercialized, and thus product lineup is enriched day by day. As optically isotropic film and phase difference film for optical compensation, “PURE-ACE®” responded in the past and will respond in the future to diversified needs. We hope to exploit a new age together with our customers.

What is PURE-ACE®?
PURE-ACE® is a polycarbonate film with high transparence and high quality, which was produced by the advanced film-forming technology and state-of-the-art facilities of Teijin Chemicals, based on its long experience and performance.Under strict quality control, integrated manufacturing from raw materials to products is performed. Product types are lined up with abundant variation for every application field, in order to be able to accurately answer the demands of customers.
PURE-ACE®
２．Product Arrangement of PURE-ACE®
PURE-ACE®
３．Manufacturing Process of PURE-ACE®
PURE-ACE®
４．Application of PURE-ACE®
Application of optically isotropic film
Application of optically anisotropic film
PURE-ACE®
５．Various Characteristics of PURE-ACE® Film
Optical characteristics
Solvent resistance
Solvent Name Type
PURE-ACE® PURE-ACE® WR
Ketones Acetone Available Available
Methyl ethyl ketone Available Available
Anone Bad Bad
Alcohols Methanol Good Good
Ethanol Good Good
Isopropanol Good Good
n-Butanol Good Good
Esters Ethyl acetate Available Available
Ethers Dioxane Bad Bad
Dioxolan Bad Bad
Tetrahydrofuran Bad Bad
Aromatic hydrocarbons
Halogenated hydrocarbonsetc.		 n-Hexane Good Good
Benzene Available Available
Toluene Available Available
Cyclohexane Good Good
Methylene chloride Bad Bad
Chloroform Bad Bad
Ethylene chloride Bad Bad
Acids Hydrochloric acid (35-37%) Good Good
Nitric acid (60-61%) Good Good
Sulfuric acid (≥ 95%) Bad Available
Quality characteristics
Item Unit PURE-ACE® PURE-ACE® WR Note
Isotropic Film Phase Difference Film Phase Difference Film
C110-100

T-138

（λ/4）

TT-138

（λ/4）

 T-570 TT-570

S-148

（λ/4）

W-142

（λ/4）
Thickness μm 100 70 40 63 38 50 75  
Phase difference (Re value) nm ≦10 138 138 562 562 148 142

(nx-ny)×thickness、

KOBRA（wavelength589nm）
Phase difference (Rth value) nm - 69 69 281 281 74 71 ((nx+ny)/2-nz)×thickness
Phase difference valuefluctuation
(total surface)		 nm - ≦±3 ≦±3 ≦±3 ≦±3 ≦±3 ≦±3  
Minute phase difference fluctuation nm/10mm - ≦2.0 ≦2.0 ≦2.0 ≦2.0 ≦2.0 ≦2.0  
Nz value - - 1.0 1.0 1.0 1.0 1.0 1.0 Nz=(nx-nz)/(nx-ny)
Slow axis angle Degree - -1.0～+1.0 -1.0～+1.0 -1.0～+1.0 -1.0～+1.0 -1.0～+1.0 -1.0～+1.0  
Phase difference value dispersion depending on wavelength - - 1.08 1.08 1.08 1.08 0.92 0.83 (450nm value)/(550nm value)
- - 0.97 0.97 0.97 0.97 1.03 1.06 (650nm value)/(550nm value)
Total light transmittance ％ ≧90 ≧90 ≧90 ≧90 ≧90 ≧89 ≧89  
Haze ％ ≦0.3 ≦0.2 ≦0.2 ≦0.2 ≦0.2 ≦0.2 ≦0.2  
Surface roughness: inner surface / outer surface nm 2/2 2/2 2/2 2/2 2/2 2/2 2/2  
Photoelastic coefficient 10-13cm2/dyn 80 80 80 80 80 40 35  
Glass transition temperature (Tg) ℃ 160 160 160 160 160 225 230  
Tensile strength at break MD/TD MPa 86.2/83.3 82/94 117/84 110/87 113/77 150/90 120/90  
Tensile elongation at break MD/TD ％ 180/165 123/172 158/141 106/195 74/205 9.0/4.0 5.0/5.0  
Young’s modulus MD/TD GPa 1.8/1.8 2.2/2.1 2.2/2.0 2.1/2.1 2.2/2.1 4.0/3.1 3.5/3.0  
Thermal shrinkage MD/TD ％ 0.1/0.1 - - - - - - 140℃×60min
* The figures in this table are typical measured values at our company, not the values for guaranteeing.
Durability performance

PURE-ACE® retains excellent durability performance in tests under various severe conditions.

Measurement instrument: KOBRA-21ADH (measurement of phase difference rate )
                                              Reading microscope (Measurement of dimension change rate)
                                             Nippon Denshoku COH-300A (measurement of haze change rate)

Item Unit Specifications
Heat resistance
（85℃×1000Hr）		 Phase difference change nm ≦±4.0
Dimension change ％ ≦±0.3
Haze change ％ ≦1.6
Moisture resistance
（60℃90%RH×1000Hr）		 Phase difference change nm ≦±4.0
Dimension change ％ ≦±0.3
Haze change ％ ≦1.6
Low-temperature resistance
（-40℃×1000Hr）		 Phase difference change nm ≦±4.0
Dimension change ％ ≦±0.3
Haze change ％ ≦1.6
Re and Rth value control range
Uniaxially-oriented film (nx>ny≒nz)
Brand Name Re value range (nm) Rth value range (nm)
T 3～2000 Rth=Re/2
TT 3～1000 Rth=Re/2
WR-S 2～180 Rth=Re/2
WR-W 2～180 Rth=Re/2
PURE-ACE®
６. Detail of Application of PURE-ACE® Film

Coloring prevention of STN liquid crystal (realization of white and black display)

 

Reflection type TFT (TFD)
In reflection type TFT, the circular polarization plate made of 1/4 wavelength plate in broadband and polarization plate is used. This circular polarization plate has a function to absorb reflection light from the electrode on back surface, and actually this function realizes black display. Although several types of broadband phase difference films existed in the past, all of them used the lamination of two or more films for attaining broadband formation. On the other hand, PURE-ACE® WR, which we developed with leading the world, enables obtaining broadband with only one film.
Semi-transmissive reflection type TFT (TFD)
Unlike reflection type TFT, semi-transmissive reflection type TFT requires the optical films that have circular polarization conversion function on the both side of liquid crystal cell. Our PURE-ACE® WR can be used as both of them. Compared with conventional type, which laminate two or more films, thinner product can be obtained. In addition, as for viewing angle, the one-film system has smaller change of axis angle against incidence angle compared with the two-film system. This fact is advantageous, making it possible to obtain wider viewing angle than that of the conventional two-film system.
Touch screen (Touch panel)
In the touch panel, in which touch panel is put inside polarization plates (inner touch panel), circular polarization plates are used as optical function films to cancel interference pattern that is generated between the gap of the touch panel. Although PURE-ACE® of standard PC can cancel the interface pattern of some specific range, the use of PURE-ACE® WR, which is excellent in broadband property with phase difference, can suppress reflected light in a wide range of visible light, improving visibility by a large margin.
OLED(Organic Light Emitting Diode)
In general, OLED needs to use metal with mirror surface on its back surface. Therefore, when OLED is especially used for mobile purpose under existence of outside light, circular polarization plate to prevent the reflection light from this back electrode is required, and this technique is actually widely used, Since PURE-ACE® WR has broadband property especially with only one piece, the circular polarization plate using this product can absorb reflection light in wide wavelength range and also with wide viewing angle. The use of PURE-ACE® WR makes it possible to obtain OLED with good visibility and little coloring caused by refection light
Monitor and liquid crystal TV
Even in TFT for use in monitor and liquid crystal TV, phase difference film is used for the purpose of improving viewing angle. This brand can supply most suitable phase difference plate to various LCD modes including perpendicular orientation mode. For instance, we can provide c-plate (biaxial orientation film), which is a 3D-controlled phase difference film that can improve viewing angle with using only one piece for perpendicular orientation mode, as well as a-plate (uniaxial orientation film), which has reverse dispersion function capable of enlarging the viewing angle of polarization plate.