Teijin Limited

Teijin Dupont Films Japan Limited

Kei Mizutani

Makoto Handa

Tetsuo Ichihashi

Hiroshi Tomita

Koji Kubo

Hideaki Watanabe

Kinji Hasegawa

Hirofumi Murooka

Masami Etchu

Masayuki Fukuda

Shinji Yano

Takashi Saigo

Kouji Kubo

Shigeyuki Watanabe

There is provided a laminated film for optical use comprising a polyester film which has a lubricity layer containing globular particles in at least one side thereof, wherein the laminated film has a thickness irregularity of 0.5 to 7.0%, and wherein the polyester film contains inert particles derived from catalysts and the amount of the inert particles determined by a dark-field microscopy satisfies the following conditions: The laminated film for optical use which is improved in uniformity, transparency, lubricity, color tone and scratch resistance, which deposits only a reduced amount of low molecular materials, and which is excellent in the adhesion to a layer adopted for various optical purposes.

Laminated film for optical use

A film for releasing a polarizing plate, which has excellent transparency, silicone adhesion and processing work efficiency, and a small orientation angle, contains little optical foreign matter and is hardly scratched. This film comprises a coextruded polyester film comprising at least two layers and a silicone adhesive layer. The coextruded polyester film has a haze value of 4% or less and an orientation angle of 10&#xb0; C. or less and contains 5 or less flyspecks having a long diameter of 90 &#x3bc;m or more per 0.3 m.

Polyester film for releasing polarizer

A polyester film composite material comprising a biaxially oriented polyester film having a thickness of 5 at least 50 gm but not more than 200 gm and an easy-adhesion coating applied onto one or each surface thereof, and having a haze value of less than 2% and a total light transmissivity of at least 90%, and a light-diffusing plate comprising a light-diffusing layer 10 laminated on the surface of the easy-adhesion coating thereof. According to the present invention, a light-diffusing plate having excellent optical properties when used in a liquid crystal display and a substrate 15 therefor are provided.

Polyester film composite, light-diffuser plate and utilization thereof

A polyester film for dry film resists, which satisfies requirements for transparency, particularly transmittance of radiation having a wavelength around 365 nm, slipperiness, winding properties, resolution and recyclability. A polyester film for dry film resists which has a thickness of 10 to 25 &mgr;m, a haze value of 3% or less and a residual polycondensation metal catalyst content of less than 150 ppm, and a metal antimony content of 15 mmol % or less based on the total of all the acid components, and a laminated polyester film comprising a lubricating layer on at least one side of the above film.

Polyester film as support for dry film resist

Biaxially oriented polyester film for heat-sensitive transfer ribbon

A biaxially oriented polyester film for a magnetic recording medium, which is formed from a polyester composition comprising at least one member of fine particulate agglomerates selected from the group consisting of alumina fine particulate agglomerates and fine particulate agglomerates of a composite oxide comprising alumina and other metal oxide(s) in a proportion of 0.05 to 1% by weight of the polyester, the fine particulate agglomerates having an average particle diameter of 0.005 to 0.5 .mu.m and having been surface-treated with an alkali metal salt of a polyvalent carboxylic acid; and other inert fine particles different from the above fine particulate agglomerates and having an average particle diameter of 0.2 to 2.0 .mu.m in a proportion of 0.05 to 5% by weight of the polyester; and a biaxially oriented laminate polyester film for a magnetic recording medium comprising a polyester film layer of the above polyester composition as at least one surface layer.

Biaxially oriented polyester film for a magnetic recording medium

A photoresist layer supporting polyester film which is a biaxially oriented film formed from a polyester containing 0.01 to 0.1% by weight of porous silica particles that are agglomerates of primary particles having an average particle diameter of 0.01 to 0.1 .mu.m and have an average particle diameter of 0.1 to 5 .mu.m and a pore volume of 0.5 to 2.0 ml/g, the number of the porous silica coarse particles having a major diameter of not smaller than 50 .mu.m being 10 or less per m.sup.2 ; and a photoresist film laminate comprising the above polyester film and a photoresist layer and a protective film, the photoresist layer and the protective film being laminated on one surface of the photoresist layer supporting polyester film. The above photoresist layer supporting polyester film is excellent in transparency and handling properties (slipperiness), and the above photoresist film laminate has excellent resolution and is almost free from circuit defect.

Photoresist layer supporting polyester film and photoresist film laminate

A biaxially oriented laminated polyester film comprising a first thin polyester layer containing large-diameter inert particles and small-diameter inert particles; a second polyester layer containing large-diameter inert particles; and a third thin polyester layer containing large-diameter inert particles and small-diameter inert particles, the biaxially oriented laminated polyester film satisfying the following expression (1), ##EQU1## wherein: W.sub.1 is the content (wt. %) of the large-diameter inert particles in the first thin polyester layer, W.sub.2 is the content (wt. %) of the large-diameter inert particles in the second polyester layer, D.sub.13 is a total of the thickness (.mu.m) of the first thin polyester layer and the thickness (.mu.m) of the third thin polyester layer, and D.sub.2 is the thickness (.mu.m) of the second polyester layer. This film is useful as a base film for a magnetic medium.

Growing community of inventors

Sagamihara, Japan

Kei Mizutani