Disclosed is a method for preparing an ultraviolet radiation absorbing polymer composition comprising the polymer compound of formula ##STR00001##
in an esterification/transesterification which method comprises the steps of reacting a polyglycerol intermediate of formula ##STR00002##
with a benzotriazole UV-chromophore comprising a complementary functional group of formula ##STR00003##
to form the polymer compound of formula (3).

Benzotriazole phenols with substituents either ortho to the phenol hydroxyl group and/or para to the phenol hydroxyl group can be prepared from the unsubstituted benzotriazole phenol by coupling reactions. The ortho substituent group can be a simple alkoxy or amino group, or the ortho substituent group can be a linking group, linking the benzotriazole phenol to another benzotriazole phenol group.

Benzotriazole phenols with substituents either ortho to the phenol hydroxyl group and/or para to the phenol hydroxyl group can be prepared from the unsubstituted benzotriazole phenol by coupling reactions. The ortho substituent group can be a simple alkoxy or amino group, or the ortho substituent group can be a linking group, linking the benzotriazole phenol to another benzotriazole phenol group.

Provided are benzotriazole derivative compounds of the general formula that are novel compounds capable of strongly absorbing light in the ultraviolet range, particularly 300-330 nm, while strongly absorbing light in the visible light short-wavelength range up to around 450 nm and being used suitably as a light absorber having high light fastness with a light-blocking function over an extended period of time. Preferably, R.sub.1 is a hydrogen atom or alkyl group, R.sub.2 is a C1-8 alkyl group, R.sub.3 is a hydrogen atom, alkyl group, acryloyloxyalkyl group, or methacryloyloxyalkyl group.

Provided are benzotriazole derivative compounds of the general formula that are novel compounds capable of strongly absorbing light in the ultraviolet range, particularly 300-330 nm, while strongly absorbing light in the visible light short-wavelength range up to around 450 nm and being used suitably as a light absorber having high light fastness with a light-blocking function over an extended period of time. Preferably, R.sub.1 is a hydrogen atom or alkyl group, R.sub.2 is a C1-8 alkyl group, R.sub.3 is a hydrogen atom, alkyl group, acryloyloxyalkyl group, or methacryloyloxyalkyl group.

A novel reactive benzotriazole UV absorber and a use thereof are disclosed. The benzotriazole UV absorber is represented by the following formula (I):

##STR00001##

wherein, A, R.sup.1, R.sup.2 and X are defined in the specification.

A novel reactive benzotriazole UV absorber and a use thereof are disclosed. The benzotriazole UV absorber is represented by the following formula (I):

##STR00001##

wherein, A, R.sup.1, R.sup.2 and X are defined in the specification.

Object To provide an organic electroluminescence device including, in order to improve the device characteristics of the organic electroluminescence device, particularly, to absorb light having the wavelengths of from 400 nm to 410 nm from sunlight, not to affect a material inside the device, and to significantly improve the light extraction efficiency, a capping layer formed of a material that has a high absorption coefficient, a high refractive index, and an excellent stability, durability, and light resistance of a thin film, and does not absorb light in the blue, green, and red wavelength range. Solving Means An organic electroluminescence device including at least an anode electrode, a hole transport layer, a light emitting layer, an electron transport layer, a cathode electrode, and a capping layer in the stated order, in which the capping layer includes a material having an extinction coefficient of not less than 0.3 at wavelengths of from 400 nm to 410 nm and an absorbance of not less than 0.2 at wavelengths of from 400 nm to 410 nm in an absorption spectrum of a concentration of 10.sup.5 mol/l.

The present invention relates to an organic EL device having at least an anodic electrode, a hole transport layer, a light emitting layer, an electron transport layer, a cathodic electrode, and a capping layer in this order, in which the capping layer contains an amine compound having a benzazole ring structure represented by the following general formula (A-1).

##STR00001##

Object

To provide an organic electroluminescence device including, in order to improve the device characteristics of the organic electroluminescence device, particularly, to absorb light having the wavelengths of from 400 nm to 410 nm from sunlight, not to affect a material inside the device, and to significantly improve the light extraction efficiency, a capping layer formed of a material that has a high absorption coefficient, a high refractive index, and an excellent stability, durability, and light resistance of a thin film, and does not absorb light in the blue, green, and red wavelength range.

Solving Means

An organic electroluminescence device including at least an anode electrode, a hole transport layer, a light emitting layer, an electron transport layer, a cathode electrode, and a capping layer in the stated order, in which the capping layer includes a material having an extinction coefficient of not less than 0.3 at wavelengths of from 400 nm to 410 nm and an absorbance of not less than 0.2 at wavelengths of from 400 nm to 410 nm in an absorption spectrum of a concentration of 10.sup.5 mol/l.