Abstract: By kneading a composition containing a filler and an organic forming binder, extruding the composition, baking the composition in a non-oxidizing atmosphere, there is obtained a first baked lead containing, as a binder, a carbon obtained by the carbonization of the organic forming binder. Then, by heating the first baked lead in an oxidizing atmosphere to remove the binder carbon, there is formed a second baked lead composed of at least the filler. The pores of the second baked lead are impregnated with a solution containing perhydropolysilazane, subjecting the lead to a heat treatment in an inert atmosphere or an ammonia gas atmosphere to form a third baked lead containing the resultant silicon nitride. Finally, ink is filled into the pores of the third baked lead to provide a baked color pencil lead.

Abstract: The present invention provides a temporary hairdye which is excellent in dispersion stability of a pigment even after storage over a long period of time by dispersing titanium black, which is safe to a human body, in alcohol having 4 or less carbon atoms, primarily ethanol by using an N-methacryloylethyl-N,N-dimethylammonium..alpha.-N-methylcarboxybetain.but yl methacrylate copolymer. Further, there can be prepared a temporary hairdye which increases dispersion stability of the pigments and provides a different hue by subjecting titanium black and other pigments, particularly iron oxide type pigments such as iron oxide red, black iron oxide and yellow iron oxide to dispersion treatment together.

Abstract: Provided is a non-erasable pencil lead for a natural pencil and a mechanical pencil, characterized in that the pores of a baked pencil lead are impregnated with an unsaturated compound containing an unsaturated group having an iodine value of at least 130 or more, wherein an antioxidant, an oxidative polymerization catalyst and/or a photosensitizer can be added in addition to the unsaturated compound.

Abstract: A coating tool (12) comprises a coating tool body (2) having a liquid storage portion (2a) for storing a coating liquid, and a cap (10) detachably fitted and mounted on the coating tool body to be in tight contact with it. In the course of mounting the cap (10), the volume of a sealed space (A) formed in the cap (10) is decreased to supply air to the main barrel (2a), thereby pressurizing the interior of the main barrel (2a). At least one of an inner surface (10b1) of the cap (10) and an outer surface of a mouthpiece (2b) which are brought into tight contact with each other in the mounting operation of the cap (10) is coated with a sealing agent (16). In the coating tool for applying a correction liquid or the like, the ability to pressurize the interior of the liquid storage portion (2a) can be improved without complicating the structure in the cap (10), and the cap can be attached and detached smoothly.

Abstract: A ball-point pen capable of preventing back leakage of ink when the pen is used to write with the ball-point tip above the ink reservoir. The pen has a ball-point tip (15); an ink reservoir (17) and a joint (19) connecting the ink reservoir with the tip for delivering ink to the tip. The joint has a tip-side bore (37a) and reservoir-side bore (33a) connected by a communicating hole (45), for allowing ink to pass from the reservoir-side bore to the tip-side bore. The communicating hole (45) is composed of a large-diameter portion (45b) and a small-diameter portion (45s) connected to the tip-side bore and the reservoir-side bore, respectively, and is eccentric to both bores. A ball 49 having a greater diameter than the bore diameter of the small-diameter portion is disposed to be freely movably in at least a part of a space formed between the rear end of the tip and the large diameter portion when the tip is fitted into the tip-side bore.

Abstract: A ballpoint pen for use with ink having thixotropic (shear viscosity decreasing properties) and a joint for regulating the flow of the ink to the pen's tip through an entrance in the tip. The joint includes a valve chamber which is disposed in an approximately middle portion of the joint with respect to the axial direction thereof for holding a ball therein with play and has a ball seat in the rear part thereof, a cavity in front of the valve chamber and a conduit communicating with an ink reservoir.

Abstract: An applicator or a tail clicking structure used in various modes of the applicators includes: a barrel cylinder storing a liquid in its inside; a clicking portion formed at the tail; a valve rod connected to the front end of a small-diameter pipe which is connected at its rear end to the clicking portion; a valve seat which is fixed at the front end opening of the barrel cylinder and slidably holds the valve rod at a position behind a large-diameter portion so that the large-diameter portion abuts or separates from the seat. The applicator further includes: a valve spring which is abutted at its rear end against the large-diameter portion so as to urge the valve rod backward; a spring receiver which is fitted into the front part of the valve seat so as to support the front end of the valve spring and has a guide hole for guiding the front end of the valve rod; and a pen tip to which the liquid inside the barrel cylinder is supplied during clicking operations.

Abstract: A production method of an ink-oozing plate for stamp having open cells, in which the production steps and the apparatus are simple, and an ink-oozing plate for stamp which can provide a sharp impress image and is conveniently used, that is, to provide a production method of a stamping plate in which a stamping plate can easily be produced with a small flashlight irradiating energy, including such a method as using a heat transfer sheet coated with a heat transfer substance which generates heat by irradiating with infrared rays and can be transferred, irradiating with infrared rays while pressing a stamp material, and coating an impress image copy with a liquid substance containing water, and thus coming to complete the production method of the ink-oozing plate for stamp of the present invention.

Abstract: The present invention provides a teeth-coating liquid comprising a color pigment represented by titanium oxide and a pearl pigment or an extender pigment represented by tricalcium phosphate, dispersed singly or in combination thereof in an alcohol series solvent, mainly ethanol with an N-methacryloylethyl-N,N-dimethylammonium..alpha.-N-methylcarboxybetaine.bu tyl methacrylate copolymer, and an applicator for the coating liquid described above.This teeth-coating liquid provides excellent dispersion stability, gloss, coating property and sticking performance by using the N-methacryloylethyl-N,N-dimethylammonium..alpha.-N-methylcarboxybetaine.bu tyl methacrylate copolymer singly or in combination with a shellac and a vinyl acetate resin.

Abstract: This invention provides a metal tip for a ball-point pen, having an ink guide hole (2) formed at the center of the bottom surface of a ball holding portion (1) and radial grooves (3) arranged around the ink guide hole. The ink guide hole has a diameter 30 to 55% the diameter of a ball and a length 1.2 to 2 times the diameter of the ink guide hole. A cleaning tool, used for removing a flash which is formed during formation of the radial grooves (3) by cutting (broaching) and which projects into the ink guide hole (2), is set to have a diameter 70 to 97% the diameter of the ink guide hole, so that only a base portion of the projecting flash is left.

Abstract: A process of producing an ink-oozing plate for a stamp having open cells, in which the production steps and the apparatus are simple, and an ink-oozing plate for a stamp which can provide a sharp impress image and is conveniently used, including such a method as using an exothermally fusible sheet coated with a heat-fusing substance which generates heat by irradiating with infrared rays and can penetrate into a stamp material, irradiating with infrared rays while pressing the stamp material, and coating an impress image copy with a liquid substance containing water, and thus coming to complete the process of producing the ink-oozing plate for a stamp of the present invention.

Abstract: A ball-point pen having a coupling, a tip at the distal end of the coupling, and a reservoir tube at the proximal end of the coupling. The tip may held in a tip holder, which, in turn, is coupled to the distal end of the coupling. A valve chamber is formed within the coupling with a ball seat having a guide hole therethrough on the rear portion of the valve chamber and projecting ridges on the front portion of the valve chamber. When the ball-point pen is positioned with its tip upward, a ball valve is brought into contact with the ball seat to close the guide hole and thereby prevent back flow of ink. When the ball-point pen is positioned with its tip downward, the guide hole is opened and the ball valve contacts the rear ends of the projecting ridges, so that ink flows into the tip through the guide hole, the valve chamber, and grooves formed between the ridges. A spring may be interposed in the inner hole of the tip with its proximal end held in place by the coupling.

Abstract: A cartridge containing a thermosensitive stencil original comprising a tape-formed thermosensitive stencil original which is to be perforated to create a print image, a pressing member for pressing the thermosensitive stencil original, and a cassette case having the pressing member disposed therein. The thermosensitive stencil original is also accommodated inside the cassette case so that the stencil original may be carried out from the cartridge. The mirror image of the desired print image is perforated onto the surface of the thermosensitive stencil original.

Abstract: A ball-point pen of the present invention is provided which includes: a ball-point pen refill being accommodated in the barrel cylinder and having: a tip with a tip ball held at the front end thereof; an ink reservoir which stores low-viscosity oily ink and has an ink follower provided in the rear end of the ink; and a joint disposed between the tip and the ink reservoir. The joint further includes: a valve chamber holding a ball valve in its inside and communicating with the rear end of the tip; and a ball valve seat disposed on the rear side of the valve chamber for the ball valve in order to prevent backward flow of ink. With this configuration, it is possible to provide a ball-point pen which, without need of any cap, can create dense writing traces free from blotting and unevenness even when a low viscosity oily ink is used.

Abstract: There are herein disclosed calcined pencil leads which have a high strength, excellent light resistance and weathering resistance as well as a sharp color and which can easily be erased by an eraser, and a method of manufacturing the calcined pencil leads.In the calcined pencil leads containing, as at least a colorant, a pigment obtained by forming the pigment in the open cells of the pencil leads, the pigment can be obtained by any of(1) a process of impregnating the open cells with a solution containing the dissolved organic pigment, and then solidifying the pigment,(2) a process of impregnating the open cells with a solution containing a pigment precursor, and then reacting it, and(3) a process of impregnating the open cells with a dye solution, and then forming a lake.

Abstract: A multiplex writing implement includes a mechanical pencil refill and ball-point pen refill which can be selectively used as desired, and is equipped with a delivering mechanism for delivering a stick-shaped article such as an eraser etc. The multiplex writing implement further includes: a front barrel for accommodating at least tip portions of these refills; a middle barrel for accommodating the remaining parts of these refills; a rear barrel which is able to rotate clockwise or counterclockwise relative to the middle barrel; and a cylindrical cam which moves integrally with the rear barrel and, in accordance with the rotational direction of the rear barrel, allows selective use of one of the refills by projecting any one of the refills from the front end of the front barrel and retracting the other refill. In this configuration, the front and middle barrels are integrally joined in such a state that each barrel is prevented from rotating and falling off relative to the other barrel.

Abstract: A porous rubber stamp material having open cells is here disclosed which comprises a print layer 2 having a spring hardness of 30 to 40 and an ink-occluding layer 1 having a spring hardness of 10 to 20, and preferably, the ink-occluding layer 1 is provided with lugs 3. The porous rubber stamp material of the present invention can overcome faults of a conventional porous rubber stamp material having open cells and permits obtaining a very sharp imprint under any push pressure. Thus, the porous rubber stamp material of the present invention can be used for the continuous sealing of a private seal, an address seal, a date seal and the like.

Abstract: The present invention provides an erasable writing ink composition which can be erased with an eraser after writing. The erasable writing ink composition of the present invention comprises 2 to 50% by weight of a resin selected from the group consisting of styrene-butadiene rubber and an acrylonitrile-butadiene rubber having a film-forming temperature of 0.degree. C. or less or a glass transition temperature of 0.degree. C. or less, 0 to 5% by weight of a surface active agent, 1 to 50% by weight of colored spherical fine particles and 20 to 97% by weight of water.

Abstract: A stamp and a process of producing a stamp includes a stamp that is made from a sponge having open cells to allow repeated impressing operations without supplying stamp ink for a long time. The process includes fitting a heat-fusing ink sheet or a heat-generating plate, which contains a heat-generating material, over the surface of a stamp-piece that has open cells therein. A liquid substance soaks a manuscript having characters, patterns, etc., which are represented by non-applied areas of recording material. The manuscript is placed over the top in such a manner that an image may appear to be a mirror image. The manuscript is irradiated from above with light to cause light to pass through the non-applied areas of recording material to increase the temperature of the heat-generating material at sites corresponding to the non-applied areas of recording material.

Abstract: A baked color pencil lead which can draw lines showing a vivid color and having excellent light fastness while holding excellent physical strength, and which is manufactured by a method comprising the steps of:kneading a blend composition comprising at least a filler and an organic forming binder, molding the composition by extrusion, and baking the molded composition in a non-oxidizing atmosphere, to thereby form a first baked lead containing a binder of a carbon produced by carbonizing the above organic forming binder,heating the first baked lead in an oxidizing atmosphere to remove the binder of the carbon by oxidation, to thereby form a second baked lead,impregnating the pores of the second baked lead with a perhydropolysilazane-containing solution and then subjecting it to a heat treatment in an inert atmosphere such as a nitrogen atmosphere or in an ammonia atmosphere, to thereby form a third baked lead containing silicon nitride produced by the heat treatment, andimpregnating the pores of the third bak