Toray Industries, Inc.

Shigetoshi Maekawa

Syunichi Osada

Kazumori Sonoda

Masahiro Kimura

Akimitsu Tsukuda

Kozo Takahashi

Tetsuya Tsunekawa

Jun Sakamoto

Takuji Higashioji

Tetsuya Machida

Daisuke Ogata

Hideki Moriyama

Risa Taniguchi

Takayuki Ohira

Masatoshi Izawa

The present invention relates to a retardation film using polyester having a photoelastic coefficient of &#x2212;40&#xd7;10Pato 40&#xd7;10Pa. The present invention also relates to a polyester resin for optical use which contains a phosphorus compound, and an alicyclic component and a fluorene derivative component as constituents, and satisfies the following equations (6) and (7):100&#xb0; C.&#x2266;glass transition temperature&#x2266;150&#xb0; C.&#x2003;&#x2003;(6)and1.0&#x2266;(/2+)/&#x2266;5.0&#x2003;&#x2003;(7),wherein Ma is the number of moles of an alkali metal element contained in 1 ton of the polyester resin, Mb is the number of moles of an alkaline earth metal element contained in 1 ton of the polyester resin, Mc is the sum of the number of moles of a zinc element (Zn), a cobalt element (Co) and a manganese element (Mn) contained in 1 ton of the polyester resin, and P is the number of moles of a phosphorus element contained in 1 ton of the polyester resin.

Retardation film and polyester resin for optical use

A white film has reflective properties, concealing properties and film-forming stability and can be made into a thin film, a white film, which contains voids therein and satisfies the following formulae (i) to (iii) is provided:0.6&#x2266;&#x2003;&#x2003;(i)20&#x2266;nA&#x2003;&#x2003;(ii)15&#x2266;nB&#x2003;&#x2003;(iii)(wherein, nA represents the number of interfaces in 10 &#x3bc;m of the surface layer in the film thickness direction; and nB represents the number of interfaces in &#xb1;5 &#x3bc;m of the central part in the film thickness direction).

White film and surface light source using same

A glass protecting film including at least 5 or more layers, of which at least one layer is the layer which comprises polyester having 1,4-cyclohexane dimethanol is one of the components, and a glass protecting including a multi-layer structure which comprises at least two kinds of thermoplastic resin, of which the difference of glass transition temperature is 40&#xb0; C. or less, the face-impact strength is 18 J/mm or more, haze is 3% or less, are films which excel in transparency, tear resistance, and impact resistance, and are suitable for protecting glass and preventing damaged glass fragments.

Protective film for glass

In order to provide a film having excellent heat resistance, thermal dimensional stability, and mechanical properties, in particular, a film capable of satisfying required properties, e.g., higher strength in accordance with the reduction in thickness of a base film, improved thermal dimensional stability and mechanical properties in a use environment, and higher heat resistance and improved thermal dimensional stability in accordance with the needs for miniaturization and more functionality in electrical and electronic areas, a thermoplastic resin is allowed to contain transition metal oxide particles, and is formed into a biaxially oriented thermoplastic resin film, wherein the melting point of the film is allowed to become higher than the melting point of the thermoplastic resin to be used. Preferably, the difference between a peak temperature (melting point T) of the heat of fusion in the first run of the measurement of the biaxially oriented thermoplastic resin film with a differential scanning calorimeter (DSC) and a peak temperature (melting point T) of the heat of fusion in the second run is allowed to satisfy the following Formula.2&#xb0; C.&#x2266;T-T&#x2266;30&#xb0; C. Alternatively, the plane orientation factor of the biaxially oriented thermoplastic resin film containing the transition metal oxide particles is controlled at 0.120 or more and less than 0.280.

Biaxially oriented thermoplastic resin film

A glass protecting film comprising at least 5 or more layers, of which at least one layer is the layer which comprises polyester having 1,4-cyclohexane dimethanol is one of the components, and a glass protecting comprising a multi-layer structure which comprises at least two kinds of thermoplastic resin, of which the difference of glass transition temperature is 40&#xb0; C. or less, the face-impact strength is 18 J/mm or more, haze is 3% or less, are films which excel in transparency, tear resistance, and impact resistance, and are suitable for protecting glass and preventing damaged glass fragments.

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Takatsuki, Japan

Shigetoshi Maekawa