Abstract: The present invention relates to a photochromic toy containing a light irradiator equipped with a light source and a toy main body containing a photochromic compound, in which the light source has a peak wavelength in the range of from 400 nm to 495 nm and the photochromic compound satisfies the following expression (1) between the integrated value of absorbance (x) in the range of from a wavelength showing a maximum absorbance in less than 400 nm to a wavelength of 400 nm and the integrated value of absorbance (y) in the wavelength range of from 400 nm to 700 nm. y/x?0.

Abstract: There is provided a friction body which is adapted to rub a thermochromic image or handwriting formed on a paper surface by use of thermochromic ink to thermally discolor the thermochromic image or handwriting by frictional heat resultant from rubbing, a thermal conductivity of a friction portion of the friction body is set to be within 0.05 W/(m·K) to 50 W/(m·K).

Abstract: The present invention relates to a photochromic toy containing a light irradiator equipped with a light source and a toy main body containing a photochromic compound, in which the light source has a peak wavelength in the range of from 400 nm to 495 nm and the photochromic compound satisfies the following expression (1) between the integrated value of absorbance (x) in the range of from a wavelength showing a maximum absorbance in less than 400 nm to a wavelength of 400 nm and the integrated value of absorbance (y) in the wavelength range of from 400 nm to 700 nm. y/x?0.

Abstract: A toy comprises a toy element comprising a photochromic layer which contains a photochromic compound having a photo memory function (color-memorizing photochromic property), maintains a coloring state by developing a color through the irradiation of ultraviolet rays or sunlight containing ultraviolet rays and changes into decolorizing state through its decolorization by the irradiation of visible light, and a color-changing means which contains at least one of an ultraviolet ray absorbent and a light-shading pigment capable of shading at least ultraviolet rays, changes the photochromic compound of the coloring state into decolorizing state by cutting off ultraviolet rays of sunlight and thereby effecting irradiation of visible light, and maintains the changed state, wherein a function to memorize and maintain coloring and decolorizing states alternately is expressed by arranging the color-changing means under such a condition that it is contacted or non-contacted with the photochromic layer.

Abstract: A color-memorizing photochromic writing instrument, which comprises a writing tip portion connected to a light-shielding tubular member or refill; and a color-memorizing photochromic ink, wherein the ink is prepared by dissolving, dispersing or suspending a diarylethene photochromic compound in a vehicle containing at least a solvent and a binder, wherein the diarylethene photochromic compound is in a coloring state, and a color-memorizing photochromic writing instrument set comprising the writing instrument and a color-changing means.

Abstract: There is provided a friction body which is adapted to rub a thermochromic image or handwriting formed on a paper surface by use of thermochromic ink to thermally discolor the thermochromic image or handwriting by frictional heat resultant from rubbing, a thermal conductivity of a friction portion of the friction body is set to be within 0.05 W/(m·K) to 50 W/(m·K).

Abstract: A photochromic material comprising a styrene-based oligomer having a weight average molecular weight of from 200 to 6000 and a photochromic compound selected from the group consisting of spirooxazine derivatives and spiropyran derivatives.

Abstract: An ink composition for a color-memorizing photochromic writing instrument, which comprises a photochromic agent containing a diarylethene photochromic compound dissolved, dispersed or suspended in a vehicle containing at least a solvent and a binder.

Abstract: A color-memorizing photochromic writing instrument, which comprises a writing tip portion connected to a light-shielding tubular member or refill; and a color-memorizing photochromic ink, wherein the ink is prepared by dissolving, dispersing or suspending a diarylethene photochromic compound in a vehicle containing at least a solvent and a binder, wherein the diarylethene photochromic compound is in a coloring state, and a color-memorizing photochromic writing instrument set comprising the writing instrument and a color-changing means.

Abstract: A magnetic display device comprising a pair of flat-sheet display members formed of a non-magnetic material having transparency at least on its display surface, and a dispersion medium and magnetic particles held between the flat-sheet display members, wherein the display surface of the flat-sheet display member has luster. The magnetic display device has a high decorative effect, which can impart luster such as iridescent luster, iridescence and hologram appearance to images formed.

Abstract: A photochromic material comprising a styrene-based oligomer having a weight average molecular weight of from 200 to 6000 and a photochromic compound selected from the group consisting of spirooxazine derivatives and spiropyran derivatives.

Abstract: A toy comprises a toy element comprising a photochromic layer which contains a photochromic compound having a photo memory function (color-memorizing photochromic property), maintains a coloring state by developing a color through the irradiation of ultraviolet rays or sunlight containing ultraviolet rays and changes into decolorizing state through its decolorization by the irradiation of visible light, and a color-changing means which contains at least one of an ultraviolet ray absorbent and a light-shading pigment capable of shading at least ultraviolet rays, changes the photochromic compound of the coloring state into decolorizing state by cutting off ultraviolet rays of sunlight and thereby effecting irradiation of visible light, and maintains the changed state, wherein a function to memorize and maintain coloring and decolorizing states alternately is expressed by arranging the color-changing means under such a condition that it is contacted or non-contacted with the photochromic layer.

Abstract: A metallic luster tone thermochromic laminate member 1, which comprises a laminate of a metallic luster layer 2 containing a metallic luster pigment prepared by coating the surface of a synthetic mica or thin section aluminum oxide with a metal oxide and a reversible thermochromic layer 3 containing a thermochromic composition comprising an electron-donating color-forming organic compound, an electron-accepting compound and an organic compound medium in which color reactions of both compounds take place reversibly. The metallic luster tone thermochromic laminate member can visualize metallic luster colors having glittering high brightness and distinct changes in color by its reversible thermochromic layer so that it can be used in versatile applications and developments.

Abstract: A color-changeable toy having a toy body to which a quasi-reversible thermochromic material is applied in a pattern. This material stably holds either of two colored states in a range of ordinary room temperatures. However, the material reversibly changes to one of the states above this range and to the other below this range. Thereby, by using commonly available heat and chilling sources such as ice, hot water or breath, one of the colors can be selected. A breath blow pipe can be used in conjunction with the toy and have an external appearance associated with that of the toy, e.g., gun and soldier.

Abstract: A metallic luster tone thermochromic laminate member 1, which comprises a laminate of a metallic luster layer 2 containing a metallic luster pigment prepared by coating the surface of a synthetic mica or thin section aluminum oxide with a metal oxide and a reversible thermochromic layer 3 containing a thermochromic composition comprising an electron-donating color-forming organic compound, an electron-accepting compound and an organic compound medium in which color reactions of both compounds take place reversibly. The metallic luster tone thermochromic laminate member can visualize metallic luster colors having glittering high brightness and distinct changes in color by its reversible thermochromic layer so that it can be used in versatile applications and developments.

Abstract: A magnetic display device comprising a pair of flat-sheet display members formed of a non-magnetic material having transparency at least on its display surface, and a dispersion medium and magnetic particles held between the flat-sheet display members, wherein the display surface of the flat-sheet display member has luster.

Abstract: A temperature-sensitive reversibly deformable laminate which is reversibly deformable towards both sides thereof with changes in temperature to take three states; an original state at room temperature, a contracted state at a low temperature, and an expanded state at a high temperature, wherein the laminate is composed of at least two resin layers having different coefficients of thermal expansion.

Abstract: A thermochromic laminate member capable of reversible change from a metallic luster color to a colorless state, comprises a first layer for regulating the wavelength of reflected light, composed of a metal luster pigment, which consists of natural mica surfacially covered with titanium oxide and has a grain size of 5 to 100 .mu.m, and a film forming material; anda second layer composed of a thermochromic material, which consists of an electron donating compound, an electron accepting compound, and an organic medium enabling a reversible color-forming reaction between said compounds and has a luminocity value of 6 or lower in the colored state and a luminocity value of 8 or higher in the colorless state, and a film forming material.