申请人:TEIJIN LIMITED
公开号:EP1452556A1
公开(公告)日:2004-09-01
A near infrared screening film which consists of a biaxially oriented film made from a polyester containing a near infrared light absorber having a weight reduction start temperature of at least 280° C and which has a haze value of 5 % or less and a total transmittance for visible lights having a wavelength of 400 to 650 nm of 40 % or more and which is exemplified by having optical properties at visible and near infrared ranges which satisfy the following expressions (1) to (4):1 < T(850) < 201 < T(950) < 20- 10 < T(620) - T(540) < 10- 10 < T(450) - T(540) < 10 wherein T(450), T(540), T(620), T(850) and T(950) are light transmittances at wavelengths of 450 nm, 540 nm, 620 nm, 850 nm and 950 nm, respectively.
This film is inexpensive, has high handling ease, a high visible light transmittance and the function of preventing the malfunction of peripheral equipment caused by near infrared lights from the screen of a plasma display, for example, and can be suitably used in the front panel of the plasma display.
一种近红外屏蔽膜,它是由聚酯制成的双向拉伸薄膜,该聚酯含有近红外光吸收剂,其减重起始温度至少为 280℃,雾度值为 5%或以下,对波长为 400 至 650 纳米的可见光的总透射率为 40%或以上,在可见光和近红外范围内的光学特性满足以下表达式(1)至(4):1 < T(850) < 201 < T(950) < 20- 10 < T(620) - T(540) < 10- 10 < T(450) - T(540) < 10 其中,T(450)、T(540)、T(620)、T(850) 和 T(950) 分别是波长为 450 纳米、540 纳米、620 纳米、850 纳米和 950 纳米时的透光率。
这种薄膜价格低廉、易于操作、可见光透射率高,还具有防止等离子显示器屏幕上的近红外线光等引起外围设备故障的功能,可适当地用于等离子显示器的前面板。