34results about How to "Improve erasability" patented technology

The white board pen ink has the recipe comprising pigment 3.5-5.0 %, uncapping agent 1.0-5.0 %, alcohol 48.0-71.0 %, propanol 15.0-25.0 %, erasing agent 5.0-10.0 %, resin 3.5-5.0 %, and dispersant 1.0-2.0 %. Its making process includes the following steps: mixing all the materials via stirring, grinding for 20-30 hr to reach pigment granularity of D50=120-200 nm, and discharging. The white board pen ink has fluent writing and high storage stability, is suitable for writing on white board, glass, plastic product, etc, and may be fitted to various kinds of pens.

An information recording medium is provided that has high recording sensitivity and high erasability, even when a recording layer thereof is as thin as about 3 nm. An information recording medium 15 on which information can be recorded by applying light or electrical energy has at least a recording layer 104 that undergoes phase change, while the recording layer 104 contains at least one element selected from among Zn, Si and C, and Sb in total proportion of 85 atomic % or more and has a composition preferably represented by the formula Sb100-a1M1a1 (atomic %) (wherein M1 represents at least one element selected from among Zn, Si and C, and a1 is a proportion in terms of atomic % that satisfies a relationship of 0<a1≦50).

A water base erasable ink composition for use in marking pens which comprises 0.05-20% by weight of a colorant and 1-20% by weight of an oily material which is nonvolatile at normal temperatures (25° C.) and is dispersed in water, wherein the oily material has a viscosity of 5-40 mPa·s at 20° C. and is dispersed in water in the form of emulsion, and wherein the colorant is dispersed in the water with the aid of a polyvinyl alcohol resin as a dispersing agent which has a saponification degree of 70-85 mol % and of which aqueous solution of 4% concentration has a viscosity of 2-30 mPa·s at 20° C. in a weight ratio of the resin to the colorant of 0.5 to 5 and in an amount of 1 to 10% by weight based on the ink composition.

To provide an image processing method including at least one of an image recording step and an image erasing step, wherein (1) laser beams are swept in the same direction and laser scanning involves a period where laser application is discontinued, (2) laser beams are swept in alternating directions and the laser scanning involves a period where laser application is discontinued, (3) laser beams are swept in alternating directions and laser scanning involves a period where laser application is discontinued, wherein the period involves no laser beam application from first laser scanning end point to second laser scanning point, or (4) laser beams are applied in alternating directions while avoiding continuous laser irradiation of nearby portions between adjacent laser beam lines, and laser scanning involves a period where laser application is discontinued.

An erasable ink is prepared from lauryl alcohol, sodium alginate, polyacrylic acid or sodium polyacrylate, soluble chloride, water and dye.

A phase-change optical recording medium which attains a high erasability in overwriting at a high linear velocity and has high recording sensitivity, excellent OW cycling characteristics, and excellent weatherability. The phase-change optical recording medium comprises a substrate and formed thereon a multilayered film comprising a protective layer and a recording layer and is that information is recorded / erased based on reversible phase changes in the recording layer between a crystalline phase and an amorphous phase, wherein the protective layer is a film made of an oxide of tantalum or aluminum and at least one carbide, and the content of the carbide is from 1 to 40 mol %.

A fingerprint easily erasable film formed by providing a resin layer on a substrate, in which surface of the resin layer is matted and which is formed so that the surface of the resin layer should show a wet tension (JIS-K 6768:1999) of 25 mN / m or higher. Preferably, the resin layer has a surface roughness of 0.2 to 2.0 μm in terms of the ten point mean roughness Rz (JIS-B 0601:1994). The resin layer preferably contains an ionizing radiation curable resin and a matting agent, more preferably, two kinds of matting agents having different average particle diameters. On the fingerprint easily erasable film having such a configuration, ingredients of fingerprint are unlikely to adhere, and even if ingredients of fingerprint adhere, the ingredients of fingerprint can be removed substantially completely or to such a degree that they cannot be visually observed by wiping with cloth or the like.

Disclosed herein is a first solid drawing material comprising water, a coloring agent, a solidifying agent that is a fatty acid alkali metal salt, and an O / W type emulsion of a separating agent that is an oily material which hardly volatilizes at room temperature. The first solid drawing material preferably contains silicone oil. A second solid drawing material is also disclosed, which comprises an organic solvent, a coloring agent, a solidifying agent that is at least one selected from the group consisting of dibenzylidene sorbitol, tribenylidene sorbitol, and derivatives thereof, a separating agent that is an oily material which hardly volatilizes at room temperature, and a resin soluble in the organic solvent. In these solid drawing materials, the separating agent is evenly dispersed, and therefore they have stable drawing properties and erasability.

The present invention provides a reversible thermosensitive recording medium including:a support, anda reversible thermosensitive recording layer laid on the support, the recording layer containing a reversible thermosensitive composition,wherein the reversible thermosensitive composition forms a relatively color-developed state and a colorless state depending on a difference in a heating temperature and / or a cooling rate after heating by the use of an electron-donating color-forming compound and an electron-accepting compound; a resin component contained in the reversible thermosensitive recording layer is a resin in which a polyol resin having a hydroxyl value within the range of 100 KOHmg / g to 250 KOHmg / g is crosslinked; and as the electron-accepting compound, a urea compound represented by the following General Formula (1) is used,where “n” is an integer of 23 or greater.

The invention relates to alcohol soluble white board marker ink easy to dry-erase and a preparation method thereof. The alcohol soluble white board marker ink comprises, by weight, 4.0-12% of macromolecule pigment, 30-60% of ethanol, 20-50% of isopropanol, 0.4-3.0% of polyvinyl butyral (PVB), 0.4-3.0% of fatty alcohol-polyoxyethylene ether, 0.4-3.0% of Solsperse series of hyperdispersant, 0.4-3.0% of glycerol, 0.1-3.0% of triethanolamine, 0.1-3.0% of paroline, 4.0-12% of laurate and 4.0-10% of butyl stearate. The preparation method includes: under the normal temperature and pressure, adding ethanol and isopropanol into a preparation vessel, then adding fatty alcohol-polyoxyethylene ether, Solsperse series of hyperdispersant, glycerol, triethanolamine, paroline, laurate and butyl stearate, then adding PVB, stirring evenly, finally adding the macromolecule pigment, and stirring for 4-8 h to obtain the ink. After the ink is dropped on the whiteboard, the ink is good in film-forming property, even in film coating, bright in color and good in stability. The preparation method is simple and easy to practice.

The invention belongs to the technical field of pencil leads, and particularly relates to a powdery pencil lead and a preparing method thereof. The powdery pencil lead is mainly prepared from, by mass, 30-35% of clay powder, 20-25% of barium sulfate, 6-10% of kaolin, 4-6 % of Arabic gum and 28-32% of pigment. The preparing method includes the steps of firstly, mixing the washed clay, barium sulfate, kaolin, Arabic gum and pigment into uniform dry powder; secondly, conducting kneading, sealed storing and grinding on the evenly-mixed dry powder in the first step; thirdly, kneading and pressing alead material ground in the second step; fourthly, conducting lead drying and head cutting on the lead material pressed in the third step to obtain the powdery pencil lead. The pencil lead meets thewriting requirement, is extremely high in color saturation and good in erasable effect and has excellent performance which other graphene pencil leads and ordinary colorful pencil leads do not have.

The invention discloses a color pencil lead with high flexural strength and a preparation method thereof. The preparation method comprises blending 20-40 parts by mass of a thermosetting resin, 10-30parts by mass of a thermoplastic resin, 30-50 parts by mass of base raw materials, 10-20 parts by mass of pigment powder, 3-7 parts by mass of an enhancing filler and a solvent under heating, removinga part of the solvent, carrying out roller mixing at 100-120 DEG C until uniform dispersion, extruding the mixture through a bar extruding machine to obtain bars, extruding the bars to obtain pencilleads, and then cutting the pencil leads to obtain color pencil leads with high flexural strength. The preparation method can produce a color pencil lead with high flexural strength, high writing markscrubbability and bright color, has simple processes, realizes a low cost and has high efficiency. The method is suitable for direct large-scale production of color pencil leads with various specifications in the traditional large-scale production factory without new equipment.

The invention provides a portable blackboard film base material, a wipe-easy portable blackboard film and a preparation method of the wipe-easy portable blackboard film. The wipe-easy portable blackboard film is prepared form the following raw materials: water-based acrylate, pigment filler, an assistant, hydroxypropyl methyl cellulose, polyethylene glycol, graphite powder, nanometer titania, lauryl sodium sulfate, talcum powder, deionized water, a flatting agent, a wetting agent, a thickening agent, an adhesion promoter and a cross-linking agent. The water-based acrylate is used as film-forming resin, the crosslinking density is improved, and the water resistance, the adhesive force and the strength of the film are improved. In addition, the water-based acrylate is a polar material, the ingredient of ink of a white marking pen is weak polar resin, and then written note is convenient to wipe. The nanometer titania and the talcum powder form smooth paint face under action of water-based polyethylene glycol and surfactant lauryl sodium sulfate. In this way, the prepared portable blackboard film is easy to wipe, convenient to carry, safe and environmentally friendly and can be used repeatedly.

The invention discloses a CMP polishing liquid for the surface of an optical communication ZrO2 ceramic ferrule and a preparation method thereof. The polishing liquid is composed of: 0.5-12% of cerium oxide, 0.1-4% of aluminum oxide, 0.01-0.1% of a wetting regulator, Dispersant 0.05-2%, dispersion stabilizer 0.01-4%, co-surfactant 0.005-0.5%, and the balance is deionized water. When preparing, add cerium oxide and alumina to the stirring disperser, add part of deionized water and wetting modifier, stir evenly, add the remaining additives and the remaining amount of deionized water, continue stirring, and adjust the pH value to 2~ 5. After ultrasonic dispersion. The polishing liquid of the present invention solves the contradiction between the uncoordinated polishing efficiency and polishing precision of using a single inorganic abrasive in the traditional CMP technology, achieves a polishing effect that cannot be achieved by a single abrasive, not only improves the polishing efficiency, but also improves the polishing accuracy, and has good application performance.

The invention relates to a high-gloss, high-hardness, easily-scrubbed and scrubbing-resistant metal material. The metal material comprises a base plate and a protective coating formed on the base plate, wherein ultraviolet (UV) curing paint is used by the protective coating; the raw material formulation of the UV curing paint comprises the following components by weight percent: 15-25% of epoxy resin, 35-45% of a UV monomer, 30-40% of yellowing-resistant resin, 1-5% of a photoinitiator, 0.1-1.5% of a flatting agent, 0.1-1.5% of a defoaming agent and 0.5-3% of anti-fouling material. The protective coating of the metal material has smooth hand feel, and is high in hardness and scratch-resistant. When a metal material is used for a writing board, the writing board has bright and full surface and is excellent in erasable property; the anti-fouling material is added into the formulation of the patient, so that whiteness residue and coloring are not easily caused by watermarks during writing, and the writing board has better writing performance and better sustainable wiping property.