Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Weight per unit area specified
Reexamination Certificate
2000-02-22
2002-05-21
Lam, Cathy (Department: 1775)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Weight per unit area specified
C428S211100, C428S341000, C428S500000, C428S532000, C427S151000, C503S209000, C503S221000, C347S103000, C347S105000
Reexamination Certificate
active
06391440
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a recording medium suitable for recording with an ink. The present invention relates also to an image formation method and a printed matter employing the above recording medium. In particular, the present invention relates to an ink-jet recording medium which gives image of high optical density and sharp color tone without causing yellowing of a white area or discoloration of a printed image; and an image formation method and a printed matter employing the above recording medium.
The ink-jet recording systems conduct recording of picture images and characters by ejecting fine ink droplets onto a recording medium like a paper sheet. The ink-jet recording system has features of high speed printing with low noise, ease of multicolor printing, flexibility in record pattern, needlessness of development and fixation of images, and so forth. Therefore, ink-jet recording systems have come to be employed widely for image information recording and other application fields. Furthermore, the image formed by a multicolor ink-jet system can be comparable to the images formed by multicolor gravure printing or color photography, and is less costly in preparing a small number of print copies, so that the ink-jet recording systems are coming to be employed also in full color recording.
In ink-jet recording, the recording apparatuses and the recording methods have been improved for a higher recording speed, higher fineness, and full-color printing. On the other hand, the recording medium therefor is required to have higher level of properties. Specifically, the recording medium is required to form an image of clear and sharp color tone with higher printed dot density, to absorb ink quickly and have a large absorption capacity not to cause flow-out or running of the ink even with overlapping of printed dots, to cause little diffusion of the printed dots in lateral direction, to give printed dots of precise circle shape with smooth periphery without blurring, and to have high whiteness to give high contrast of the printed dots.
Hitherto, various trials have been made to meet the above requirements. For example, an inorganic pigment is applied, with a binder if necessary, onto the surface of the substrate, or is incorporated into the substrate. JP-A-55-5830 (the term “JP-A” herein means a “Japanese Patent Application Laid-Open No.”) discloses an ink-jet recording paper sheet having an ink-absorbent coating layer provided on the surface of the supporting member. JP-A-55-51583 and JP-A-62-158084 disclose a recording sheet coated with or internally containing amorphous silica or a salt thereof, or a mixture thereof. JP-A-55-144172 discloses a coat layer containing an ink-absorbent pigment such as zeolite. JP-A-56-148583 discloses a coat layer composed of fine powdery silicate and a water-soluble resin. JP-A-60-232990 discloses a coat layer containing cationic alumina hydrate. JP-A-2-276670 discloses a recording sheet containing pseudo-boehmite.
However, the recording mediums containing an inorganic pigment as above are liable to be yellowed at an unprinted area or a white ground under a certain conditions, or to cause discoloration or fading of the recorded image by the action of ozone or light. Use of a pigment of a larger specific surface area will improve remarkably the color development, but tends to facilitate discoloration of a white ground or fading of images.
On the other hand, various investigations have been made for prevention of discoloration of an unprinted or a white ground and fading of an image, for example, as below. JP-A-09-309265 discloses a recording medium containing a metal component of Group 2 and amorphous or fine laminar crystalline silica. JP-A-57-87987 discloses a recording medium containing a specified metal oxide such as phosphotungstate and phosphomolybdate, or a specified metal chloride such as chromic chloride. This disclosure intends in principle to retard the reactivity of the inorganic pigment by covering with the metal component the reactive sites such as acid points of the inorganic pigment. However, the added metal compound may cause change of the color tone or bronzing of the recorded image, so that the disclosed recording medium is not sufficiently effective in prevention of fading in ozone exposure.
JP-A-05-221115 discloses a recording medium containing starch particles, an ethylene-vinyl acetate copolymer, and a cationic dye-fixing agent. JP-A-06-183133 discloses a recording medium containing starch particles and cationic aluminum oxide. These disclosures intend in principle to prevent yellowing of the recording medium by addition of the starch particles. However, the added starch particles may lower the ink absorbency or may facilitate migration of the printed dye.
JP-A-01-18684 discloses a recording medium containing an undecane type compound of a specified structure. JP-A-01-36479 discloses a recording medium containing a thioether type compound of a specified structure. JP-A-01-36480 discloses a recording medium containing a phenol type compound of a specified structure. JP-A-01-115677 discloses a recording sheet containing synthetic silica having a BET specific surface area of not less than 100 m
2
/g and a thioether. JP-A-06-286297 discloses a recording medium containing a polyvalent chain carboxylic acid. JP-A-06-316145 discloses a recording medium containing an organic acid having an aromatic nucleus.
JP-A-07-68919 discloses a recording medium containing a UV absorber, an antioxidant, a light quencher, or the like. JP-A-07-314881 discloses a recording medium containing a urea derivative, a semicarbazide derivative, a carbohydrazide derivative, or the like. JP-A-07-314882 discloses a recording medium containing a dithiocarbamic acid, a thiuram salt, a thiocyanate ester, a thiocyanate salt, a hindered amine, or the like. JP-A-07-314883 discloses a recording medium containing a thiourea derivative, a thiosemicarbazide derivative, thiocarbohydrazide derivative, or the like. JP-A-08-25796 discloses a recording medium containing a compound selected from thiourea derivatives, thiosemicarbazide derivatives, and thiocarbohydrazide derivatives, and a substance selected from iodine, iodides, dithiocarbamic acids, thiocyanate salts, and thiocyanate esters.
JP-A-08-118791 discloses a recording medium having an ink-receiving layer containing an inorganic pigment having a BET specific surface area of not less than 100 m
2
/g and an adhesive and containing a phosphorus type antioxidant. JP-A-08-150773 discloses a recording medium having an ink-receiving layer containing an inorganic pigment having a BET specific surface area of not less than 100 m
2
/g and an adhesive and containing ascorbic acid or erisorbic acid, or a derivative thereof. JP-A-08-164664 discloses a recording medium having an ink-receiving layer containing an inorganic pigment having a BET specific surface area of not less than 100 m
2
/g and an adhesive and containing cycloamylose to fix 20% or more of the surface area of the inorganic pigment.
Any of the aforementioned methods prevents, in principle, the oxidation deterioration of coloring matter component of the printed image by incorporation of an antioxidant into the recording medium. However, the added antioxidant itself may become colored, or addition of the antioxidant in an amount effective to prevent color-facing may impair the ink absorbency or may cause ink repulsion. Otherwise, the antioxidant itself may deteriorate with lapse of time and may deposit on the surface of the recording medium, or may disappear from the recording medium by sublimation or a like process. A highly reactive antioxidant may shorten the duration of the fading-prevention effect. Further the addition of the antioxidant may cause exudation of odor from the recording medium. Some of the antioxidants are less soluble in a solvent, and cannot readily be added to the recording medium in a necessary amount.
JP-A-08-169172, JP-A-08-174988, and JP-A-08-174991 disclose respectively a recordin
Shinjo Kenji
Yoshino Hitoshi
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Lam Cathy
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