Colloid systems and wetting agents; subcombinations thereof; pro – Continuous liquid or supercritical phase: colloid systems;... – Aqueous continuous liquid phase and discontinuous phase...
Reexamination Certificate
1999-05-12
2002-11-05
Lovering, Richard D. (Department: 1712)
Colloid systems and wetting agents; subcombinations thereof; pro
Continuous liquid or supercritical phase: colloid systems;...
Aqueous continuous liquid phase and discontinuous phase...
C106S286500, C428S195100, C524S238000, C524S430000
Reexamination Certificate
active
06476083
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to alumina dispersant, alumina dispersion liquid, agent for treating inkjet-printing materials, and inkjet-printing materials, more particularly alumina dispersion liquid being unchanged in viscosity for long term, dispersing alumina uniformly and having no smell, alumina dispersant for preparing such excellent alumina dispersion liquid, agent for being used to produce printing material having high glossiness, high absorption for ink, high water-resistance, and good reproducibility and roundness of dots of ink printed on the materials by inkjet-printer, and an inkjet-printing material treated with the agent.
2. Description of Related Art
Many kinds of solid-liquid dispersions comprising a liquid containing fine solid particles dispersed therein are recently seen in many products or production processes. The solid-liquid dispersion products using alumina or alumina hydrate as the fine solid particles are, for example, an abrasive slurry, thickening agent for ink or paint, tooth paste, domestic cleaner and wax. The solid-liquid dispersions used in the production processes are, for example, a coating dispersion to be applied on printing materials for using in inkjet-printing, for example, OHP films, glossy films or glossy papers, and a liquid for using in kneading abrasive grains.
The dispersibility of fine particles in various slurries used in these products or production processes is very important.
For example, it is a known problem that abrading a work surface with an abrasive slurry having a poor dispersibility of abrasives such as alumina particles causes scratches to form on the work surface. Furthermore. it is a problem that the poor dispersibility of fine particles in dispersion products such as a cleaner or wax, which are sold in various containers such as a spray can or aerosol can, causes the dispersion products to be thickened. there are further problems as follows: (1) fine particles in a dispersion are aggregated into aggregates during short-term; (2) such aggregates clog spraying nozzles of spray coating cans or aerosol coating cans; (3) the aggregates are settled on the bottoms of containers for dispersions, such as cans or bottles, so that the dispersions cannot be kept in a uniform condition; (4) the dispersion is divided into a supernatant layer of a dispersing medium and a precipitation layer of fine particles; (5) the concentration of fine particles is lower at the upper portion of the dispersion and higher at the lower portion; and (6) the dispersion gets easy to be gelled.
There may also be such problems as follows: (7) a dispersion cannot easily be obtained owing to air taken in the fine particles, for example, when alumina particles of 5 to 100 nm in primary average particle size are to be dispersed in an aqueous dispersing medium so that the concentration of them can be, for example, 15 wt % or more; (8) the viscosity of the resulting dispersion is highly raised; (9) the handling of the resulting dispersion is poor; (10) it requires a longer time to disperse fine particles into a given aqueous medium, in other words, the efficiency of production is low; (11) a dispersion having a higher concentration of fine particles is hardly obtained.
Hitherto, as a material for printing images, also including letters, characters or etc., there have been employed various materials such as wood, paper, resin, metal, glass, ceramic, leather, etc. Such material is in the form of film, sheet, flat plate, curved plate, corrugated plate, woven sheet, foamed body, etc.
For example, where images are to be printed on printing materials by a inkjet-printing method, a printing material such as a thermoplastic resin film or paper has been coated with a treating agent containing a cationic polymer to thereby improve the ink adhesion.
The above-mentioned treating agent containing a cationic polymer rapidly absorbs a water content of an aqueous ink to prevent blotting the ink on the printing material and adhere the ink content onto the treating agent.
However, the above-mentioned treating agent with which the printing material was treated, was dissolved in water when the agent-treated and image-printed material was brought into contact with water. Thus, the printed image was blurred.
A printing medium having a porous material-containing ink-receptive layer formed thereon has been proposed in Japanese Patent Pre-examination Publication No. Sho60-245588 and Japanese Patent Post-examination Publication No. Hei7-2430.
Japanese Patent Pre-examination Publication No. Sho60-245588 discloses “an inkjet-recording material comprising a substrate having at least one ink-receptive layer formed thereon, said ink-receptive layer containing a porous alumina xerogel having micropores of 40 to 1,000 Å in radius”. Japanese Patent Post-examination Publication No. Hei7-2430 discloses “A recording sheet comprising a transparent substrate having a porous ink-receptive layer. said ink-receptive layer being mainly comprised of psuedo-boehmite, the total volume of micropores of 100 to 1,000 Å in radius in said layer being 1 cc/gr. or less.”
It is said that the above-mentioned printing materials comprising a substrate having an ink-receptive layer formed thereon, the layer containing a porous material having micropores, can absorb the water content of an aqueous ink applied thereto into the micropores, thereby preventing the blotting of the ink to improve the quality of printed image such as color intensity and coloring performance
However, where the printing materials are provided thereon with the porous material-containing ink-receptive layer, by applying a coating composition comprising the porous material and a binder onto the substrate, there occur some problems based on the poor dispersibility of the porous material in the coating composition. For example, the coating composition is easily gelled, and hardly applied uniformly over the substrate. Furthermore, cracks are easily formed in the ink-receptive layer provided on the coated substrate when dried. Inkjet-printing makes an ink blot on the resulting printing materials, thus no clear image can be obtained.
For the purpose of improving the printing performance, such as a quality of image, adhesion of ink, durability of image, etc., of the printing materials, various treating agents have hitherto been applied on the surface of commercially available printing materials. Such commercially available printing materials may be a paper, OHP film or glossy paper suited for main use in inkjet-printing.
The thus surface-treated printing materials are mass-produced by applying the treating agents onto a rolled paper or resin film by coating machine, then cutting the paper and film in a predetermined size.
However, only a few kinds of materials have been used as the substrate of the printing materials, e.g., paper and resins such as PET. Many other materials have not been used, because they could not easily be obtained.
For example, where a substrate other than paper and resins. or a PPC paper or hand-made Japanese paper limited in a desired form is to be used to obtain the surface treated printing materials, users themselves must coat the treating agent onto the substrate.
Therefore, it has been demanded that the printing materials can easily be obtained, regardless of the material and form of the substrate, the surface of which is to be treated with the treating agent.
In general, methods of applying the treating agent onto the surface of substrate may be, for example, an aerosol-applying method, spraying meth rushing method, etc. Thus, the treating agent comprising a mixture of fine solid particles dispersed in a dispersing medium and an adhesive or binder is applied onto the substrate. These methods bear some problems based on the high thickening of the dispersion and poor dispersibility of fine solid particles in the dispersion. For example, there occur problems (1) to (11) mentioned above.
In addition, for example, there are prior art methods in which surface
Kawada Kenji
Ochiai Tetsuya
Okura Kousuke
Browdy and Neimark , P.L.L.C.
Lovering Richard D.
Taiho Industries Co. Ltd.
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