Nitto-Denko Corporation

Michie Sakamoto

Amane Mochizuki

Masahiro Yoshioka

Takahiro Fukuoka

Yuji Hotta

Sadahito Misumi

Yutaka Ohmori

Seiji Umemoto

Takami Hikita

Michio Satsuma

Michiharu Yamamoto

Shunsuke Noumi

Takahisa Konishi

Akinori Izaki

Megumu Nagasawa

Akiko Matsumura

Masaya Yano

Masatoshi Maeda

Yosuke Yamada

Hiroyoshi Take

Hisae Sugihara

Shuusaku Nakano

Takashi Kamijou

Junzou Miyazaki

Mashiro Yoshioka

Chiharu Yano

Yuko Saito

A modified polymer which can serve as a raw material of novel reverse dispersion retardation films is provided, the modified polymer having no need to select a plurality of monomers or polymers in order to realize a reverse dispersion and having no problems concerning glass transition temperature or the like in drawing treatment. A polymer having a polyol skeleton as its main chain is caused to react with a compound for modification such as an aromatic carboxylic acid hydride. Through this reaction, a modified polymer in which a chemical group such as an aromatic carbonyl group is bonded to an oxygen atom in a side chain of the polyol skeleton is prepared. For example, polyvinyl alcohols and benzoyl chloride can be used as the polymer and the compound for modification, respectively. The chemical group may be a benzoyl group. When this modified polymer is formed into a film and then subjected to drawing treatment, a retardation film which exhibits a reverse wavelength dispersion characteristic can be obtained.

Retardation film, use of said retardation film, and novel modified polymer

There is provided a retardation film including a stretched film of a polymer film having an absolute value of photoelastic coefficient (m/N) of 50&#xd7;10or less measured by using light of a wavelength of 550 nm at 23&#xb0; C., which satisfies the following expressions (1) and (2):Re[450]&#x3c;Re[550]&#x3c;Re[650]&#x2003;&#x2003;(1)Rth[550]&#x3c;Re[550]&#x2003;&#x2003;(2).In the expressions (1) and (2): Re[450], Re[550], and Re[650] respectively represent in-plane retardation values measured by using light of wavelengths of 450 nm, 550 nm, and 650 nm at 23&#xb0; C.; and Rth[550] represents a thickness direction retardation value measured by using light of a wavelength of 550 nm at 23&#xb0; C.

Retardation film, polarizing element, liquid crystal panel, and liquid crystal apparatus

A retardation film according to the present invention consists of a single-layer film in which a birefringent chain polymer is oriented, the polymer having as a repeating unit (A), a structure represented by the following general formula (V): 

Retardation film, novel polymer, optical film, and image display device

An optical film containing polyaryletherketone and a method of producing the optical film, the optical film being excellent in the heat resistance and uniformity, and the film having a negative birefringence. The optical film compensates birefringence of a liquid crystal display, thereby providing an optical element or an image display device that has desired color tones and viewing-angle characteristics. The optical film having a negative birefringence of 0.001 to 0.6 is produced by coating a solution containing polyaryletherketone on a substrate and subsequently drying the coating.

Optical film and method of producing the same, optical element, and image display device

Aromatic polycarbodiimide and sheet thereof

An aromatic polycarbodiimide having a specified structural unit is disclosed. The aromatic polycarbodiimide can give films, moldings, adhesives and the like each having excellent characteristics such as high heat resistance, high dimensional stability, high moisture resistance or the like, and therefore is suitable for use as a heat resistant covering material in, for example, production of electronic parts.

Aromatic polycarbodiimide and films thereof

An aromatic polycarbodiimide comprising a structure represented by the following formula (1) has excellent low moisture resistance, heat resistance and a low dielectric constant:

Aromatic polycarbodiimide and polycarbodiimide sheet

An aromatic polycarbodiimide comprising a structure represented by the following formula (1) has high solubility in organic solvents, good processability, excellent moisture resistance, and water repellency:

Aromatic polycarbodiimide and water repellent sheet made therefrom

A thermosetting resin composition for a fixing treatment of electronic parts, which is able to adhere in short time at low temperature, has a heat resistance, is lowly hygroscopic, and hardly produces package cracks, etc. The thermosetting resin composition comprises polycarbodiimide which is soluble in organic solvents and silicone-modified polyimide which is soluble in organic solvents, which are compounded.

Thermosetting resin composition

Disclosed is a gas separating membrane comprising a layer made of a polycarbodiimide resin having repeating units represented by formula (I): ##STR1## wherein R represents a divalent organic group. The gas separating membrane available according to the present invention has high permeability and separation selectivity as well as excellent permeating performance, and further has excellent heat resistance, chemical resistance and durability.

Gas separating membrane having a polycarbodiimide resin layer

A semiconductor device with a metal foil and a sealing resin material. Metal foil is formed integrally with the sealing resin layer.

Semiconductor device having metal foil integral with sealing resin

A polycarbodiimide having excellent heat resistance and humidity resistance, which comprises a structural unit represented by the following formula (A) ##STR1## wherein R represents a divalent organic group represented by any one of the following formulae (I) and (II), n is an integer of 2 to 400 ##STR2## wherein X.sub.1 to X.sub.4 independently represent a hydrogen or an alkyl group having 1 to 3 carbon atoms.

Aromatic polycarbodiimide and film thereof

An aromatic polycarbodiimide comprising a structural repeating unit represented by the following formula (I): ##STR1## wherein n is an integer of 2 to 200.

An aromatic polycarbodiimide containing a siloxane bond in the polymer main chain thereof. The polycarbodiimide can adhere at a low temperature in a short time and has a high heat resistance. The polycarbodiimide has a good adhesive property to an adherend such as semiconductor elements, has a low hygroscopic property and is excellent in the storage stability. Therefore, the polycarbodiimide can be stored for a long period of time at normal temperature.

Growing community of inventors

Ibaraki, Japan

Michie Sakamoto