Abstract: A thermochromic coloring color-memory composition comprising a homogeneous solubilized mixture of (A) an electron donative coloring organic compound, (B) an electron accepting compound and (C) a compound represented by the specific formula as a reaction medium which controls color reactions of the components (A) and (B).

Abstract: Hair for toys which is constituted of filaments made of an alcohol-soluble resin is disclosed. The hair for toys may also be hair for toys which is constituted of filaments made of a composite resin made up of a core and a sheath, where at least one of the resin of the core and that of the sheath is an alcohol-soluble resin.

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 water-based ink composition for ballpoint pen, which comprises at least a colorant, water, a shear-thinning tackifier and a thickening inhibitor, wherein a ratio (x) of a viscosity after evaporation of 40 wt % of water from the total ink amount to an initial ink viscosity (as measured by EMD viscometer at 1 rpm and 20° C.) is 2 or less; and a ballpoint pen comprising the same.

Abstract: A friction body that produces frictional heat allowing development, disappearance or change of color of handwriting formed with a writing instrument for producing thermochromic handwriting, with the friction body having a friction coefficient of 0.2 to 1.0 when rubbed against paper surface, and a writing instrument for use in forming thermochromic handwriting which is equipped with the friction body and a writing instrument set including the friction body and a writing instrument for use in forming thermochromic handwriting.

Abstract: A double-head writing instrument has a barrel having a partition formed inside thereof, first and second ink-tanks provided inside the barrel so as not to communicate each other, first and second ink-retaining members connected with first and second nibs provided on an opening of the first and second ink-tanks, respectively, first and second ink reserved inside first and second ink-reservoirs, respectively. The partition is extended in an axial direction so as that the first and second ink-reservoirs overlap each other in a radial direction, and thickness C of the partition and thickness D of a side wall of the barrel connected with the partition satisfy a relation of 0.2?C/D?2.5.

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 reversible thermochromic display article which comprises a substrate and, formed thereon, a heat coloration image containing a heat coloration type reversible thermochromic composition which is colored by heating and is decolored by cooling and a heat decoloration image containing a heat decoloration type reversible thermochromic composition which is decolored by heating and is colored by cooling, or having a multilayer structure comprising a heat coloration layer containing the heat coloration type reversible thermochromic composition and a heat decoloration layer containing the heat decoloration type reversible thermochromic composition, wherein the heat coloration type reversible thermochromic composition is a microcapsule composition which contains, enclosed therein, (a) an electron-donating chromatic organic compound, (b)? an electron-accepting compound selected from gallic acid esters, and (c) a reaction medium having a melting point lower than 50° C.

Abstract: A thermally color-developing reversibly thermochromic pigment which shows a uniform color density in the coloring temperature range and also shows an optimal ?H value within a range of from 3 to 40° C. Thermally color-developing reversibly thermochromic pigments of a three component system having a ?H value within a range of from 7 to 40° C. in which at least essential three components including (a) an electron-donating chromic organic compound, (b) a specified compound selected from the gallic acid esters and (c) a reaction medium selected from alcohols, esters, ketones and hydrocarbons; which reversibly generates color reactions of both of the compounds within a specified temperature range and has a melting point of less than 50° C., are microencapsulated, and of a four component system having a ?H value within a range of from 3 to 25° C. in which a compound (d) selected from monomer compounds having a melting point of 50° C. or more or polymer compounds having a softening point of 70° C.

Abstract: A water-based ink composition for ballpoint pen which has a colorant, water, a water soluble organic solvent and, as a shear-thinning tackifier, a polysaccharide, wherein the polysaccharide exists in the ink as particles having an average particle size less than 5 ?m, and a water-based ballpoint pen using the composition.

Abstract: To provide a relatively lightweight wall adhering material comprising a non-woven fabric or a water-resistant paper, having a specific coating weight as a substrate and provided thereon a specific amount of a porous layer, a water-discoloring wall adhering material which has excellent convenience at the time of production and use, promptly forms clear image to perceive, is difficult to fall down when adhered to a wall, and has high commercial value, and a water-discoloring wall adhering material set using the same.

Abstract: An ink composition useful in an oil-based ballpoint pen capable of drawing a satisfactory line on the surfaces of various materials to be written which are not only papers but also non-permeable materials such as glasses and plastics as well as fibrous materials such as fabrics is provided. Such a ink composition comprises a colorant, an organic solvent having a vapor pressure of 5.0 to 50 mmHg (20° C.) as a main solvent, such as n-propyl alcohol, isopropyl alcohol and propylene glycol monomethyl ether and a shear-viscosity reducing agent.

Abstract: A direct-fluid-supply writing implement has a pentip, an ink occlusion body connected to a rear end of the pentip, an ink tank that directly stores ink and is arranged at a rear of the ink occlusion body, a plurality of communication tubes that connects the ink tank to the ink occlusion body and a partition wall provided between the ink occlusion body and the ink tank. Forward end portions of the communication tubes are protruded forward from a front face of the partition wall, and are located inside the ink occlusion body. At least one of the communication tubes is provided such that a rear end of the communication tube is protruded backward from a rear face of the partition wall and is located inside the ink tank.

Abstract: A friction body for allowing an image having reversible thermochromism to change color from a first state to a second state by frictional heat, wherein the above-mentioned frictional body has a contact area ranging from 0.5 to 15 mm2 when pressed onto a glass plate with a load of 1000 g, a writing instrument containing a reversible thermochromic ink, which is provided with the above-mentioned friction body, and a writing instrument set having the writing instrument containing a reversible thermochromic ink and the above-mentioned friction body.

Abstract: To provide: a water-discoloring drawing toy which, when a writing utensil or applicator for water adhesion is applied thereto, produces a multicolor image and which eliminates the monotonous production of monochromatic images in a related-art technique and is rich in unexpectedness and changes; and a water-discoloring drawing toy set including this drawing toy.

Abstract: A writing instrument for a water-metachromatic member has a cylindrical container capable of holding water, formed with an opening at a tip end thereof to communicate the interior of the container with the exterior thereof, a hollow cylindrical holder which directly holds a pen point member, being formed at a tip end with an opening through which the tip end of said pen point member is projected outwardly and at a rear end with a communication hole, and a gap provided between an inner peripheral surface of the cylindrical holder and an outer peripheral surface of the rod-like body to form a gap for generating a capillary force therebetween. When the holder is held to the container, water is supplied through said communication hole to said pen point member. When the holder is detached from the container, the opening of the container is usable for water supply.

Abstract: A reversibly metachromatic toy having a platelike resin foamed substrate, a resin layer provided on both the outer side surfaces of the foamed substrate, and a reversibly metachromatic layer provided on at least one-side resin layer partly or all over the surface.

Abstract: A writing instrument for a water-metachromatic member has a cylindrical container capable of holding water, formed with an opening at a tip end thereof to communicate the interior of the container with the exterior thereof, a hollow cylindrical holder which directly holds a pen point member, being formed at a tip end with an opening through which the tip end of said pen point member is projected outwardly and at a rear end with a communication hole, and a gap provided between an inner peripheral surface of the cylindrical holder and an outer peripheral surface of the rod-like body to form a gap for generating a capillary force therebetween. When the holder is held to the container, water is supplied through said communication hole to said pen point member. When the holder is detached from the container, the opening of the container is usable for water supply.

Abstract: An ballpoint pen has: a tip body made of metal having an front edge part and a plurality of inward protrusions; a ball rotatably embraced between the front edge part and the inward protrusions; and a rod part urging the ball forwardly and bringing the ball into close contact with the inner surface of the front edge part, wherein ink outflow gaps are formed each between the adjacent inward protrusions, the rod part is inserted into the central part of the ink outflow gaps, the diameter of a virtual inscribed circle of the central part of the ink outflow gaps is larger than the outside diameter of the rod part, and a minimum dimension of each the ink outflow gap is smaller than the outside diameter of the rod part.

Abstract: On a support, a porous resin layer which is opaque in a water-unabsorbed state and capable of turning transparent in a water-absorbed state is formed, and also a water-repellent resin layer is so provided as to exist in the porous resin layer at its some area or areas in a co-existent state, to make up a water-metachromatic laminate. A novel toy element can be provided in which latent images standing invisible in a normal condition are rendered visible by means of water as a medium so as to be visually distinguished.