Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
  • G03G7/0073—Organic components thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
  • B41M5/508—Supports
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5245—Macromolecular coatings characterised by the use of polymers containing cationic or anionic groups, e.g. mordants
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
  • G03G7/002—Organic components thereof
  • G03G7/0026—Organic components thereof being macromolecular

Definitions

• the present invention relates to a paper for ink jet and electrophotographic recording usable for both the ink jet recording method and the electrophotographic recording method. More particularly, it relates to a paper for ink jet and electrophotographic recording which is a recording paper of so-called plain paper type having no special coating on the recording surface, and, especially, which is excellent in water resistance of images recorded thereon with a water-soluble ink by ink jet recording method and excellent in toner transferability and running property in color recording by electrophotographic recording method.
• an ink is directly jetted onto a recording paper, and this method attracts attention as a recording method because it is low in running cost, little in noise and easy in color recording.
• water-soluble inks are used from the points of safety and printability, and recording papers used for this recording method are required to have the following properties, namely, the ink is quickly absorbed in the recording papers and when inks of different color overlap each other on the recording papers, the inks do not flow together; spread of ink dot ejected on the recording paper is proper; the shape of the dot is close to right circle; the dot edge is sharp; dot density is high; and the recording papers have sufficiently high whiteness for enhancement of dot contrast.
• JP-A-59-35977 and JP-A-1-135682 proposed coated papers exclusively used for the methods in order to meet the above requirements.
• inexpensive and general-purpose recording papers namely, plain papers generally used in electrophotographic recording methods are desired.
• EP-A-0 745 488 describes an ink jet recording sheet to be used for a high speed rotary ink jet printing system, said sheet comprising a support and a cationic resin attached to the support.
• the support may be surface sized with a sizing agent of the AKD type or rosin type.
• EP-A-0 652 113 is directed to a printing paper comprising a cationic compound on a printing surface of a base paper.
• the base paper may be internally sized with various sizing agents, with no preference given to a particular type of sizing agent.
• the object of the present invention is to provide a paper for ink jet and electrophotographic recording of plain paper type which is excellent in water resistance of images recorded thereon by ink jet recording method and excellent in toner transferability and running property in color recording by electrophotographic recording method.
• the present invention relates to a paper for ink jet and electrophotographic recording usable for both the recordings which comprises a support having a cationic resin adhered thereto in a dry adhering amount of 0.5-2.0 g/m 2 and which has a surface resistivity of 1.0 ⁇ 10 9 - 9.9 ⁇ 10 13 ⁇ .
• Cation equivalent of the cationic resin measured by colloidal titration method is preferably 3-8 meq/g.
• the support contains a neutral rosin sizing agent or an alkenyl succinic anhydride as an internal sizing agent.
• the support may contain a waste paper pulp.
• the inventors have conducted an intensive study on the above problems, and, as a result, found that a satisfactory water resistance of ink in ink jet recording can be obtained when the dry adhering amount of the cationic resin is 0.5-2.0 g/m 2 and a recording paper superior in transferability of toners and running property in electrophotographic recording can be obtained when the surface resistivity is 1.0 ⁇ 10 9 - 9.9 ⁇ 10 13 ⁇ .
• the dry adhering amount of the cationic resin is less than 0.5 g/m 2 , sufficient water resistance of ink cannot be obtained and if it is more than 2.0 g/m 2 , the water resistance of ink is sufficient, but the surface resistivity is lower than 1.0 ⁇ 10 9 ⁇ to cause deterioration in transferability of toners.
• the surface resistivity (unit: ⁇ ) in the present invention is calculated by a calculation formula according to JIS K6911, and, specifically, can be obtained by conducting measurement and calculation using 4329A type high resistance meter and 16008A type resistivity cell (manufactured by Yokogawa Hewlett-Packard Co.) in an atmosphere of 20°C and 65%RH with a charging time of 30 seconds in accordance with the instruction book for the instruments.
• the cationic resins used in the present invention are monomers, oligomers or polymers of primary - tertiary amines or quaternary ammonium salts which react with sulfonic acid group, carboxyl group, amino group or the like in the direct dyes or acid dyes contained in water-soluble inks to produce insoluble salts, and oligomers or polymers are preferred. Specific examples thereof are dimethylamine. epichlorohydrin polycondensates, acrylamide.diallylamine copolymers, polyvinylamine copolymers, dicyandiamide, dimethyl ⁇ diallyl ⁇ ammonium chloride, and the like.
• the cationic resins are not limited to these examples.
• cation equivalent of the cationic resins according to colloidal titration method is in the range of 3-8 meq/g.
• the cationic resin is diluted with distilled water to 0.1% in solid content, and adjustment of pH is not conducted.
• the surface resistivity of the recording paper in the present invention is 1.0 ⁇ 10 9 - 9.9 ⁇ 10 13 ⁇ , preferably 1.0 ⁇ 10 10 - 9.9 ⁇ 10 13 ⁇ . If the surface resistivity is lower than 1.0 ⁇ 10 9 , chargeability decreases and, for this reason, transferability of toners is deteriorated, and if it is higher than 9.9 ⁇ 10 13 , the chargeability increases to cause scattering of toners or unsatisfactory running property of the recording papers.
• Supports of the recording papers of the present invention include papers mainly composed of wood fibers and sheet-like materials such as nonwoven fabrics mainly composed of wood fibers or synthetic fibers.
• Wood pulps used for papers include, for example, soft wood bleached kraft pulp (NBKP), hard wood bleached kraft pulp (LBKP), soft wood bleached sulfite pulp (NBSP), hard wood bleached sulfite pulp (LBSP), ground wood pulp (GP), thermo-mechanical pulp (TMP) and, besides, waste paper pulp. These are used each alone or in combination as required.
• the proportion of the waste paper pulp in the total pulp is preferably 40% or less for the inhibition of curling which may occur after electrophotographic recording.
• OA waste papers such as non-coated papers for computers which are information-related papers, papers for printers, e.g., heat-sensitive papers and pressure-sensitive papers, and PPC papers, and waste papers of papers or boards, e.g., coated papers such as art papers, coated papers, slightly coated papers (bitoko papers), and matte papers, and non-coated papers such as woodfree papers, color woodfree papers, notebook papers, letter papers, packing papers, fancy papers, woodcontain papers, newspapers, groundwood papers, supercalendered papers, flyleaf shaving papers, pure white machine glazed papers, and milk cartons, and these waste papers are chemical pulp papers and high yield pulp-containing papers. These are not limited irrespective of printed papers, copied papers, or non-printed papers.
• Waste paper pulp is generally produced through combination of the following four steps.
• Internal fillers used for the support include known pigments such as white pigment, and these can be used each alone or in combination.
• the fillers are white inorganic pigments such as precipitated calcium carbonate, heavy calcium carbonate, kaolin, clay, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic silica, aluminum hydroxide, alumina, lithopone, zeolite, magnesium carbonate and magnesium hydroxide, and organic pigments such as styrene plastic pigments, acrylic plastic pigments, polyethylene, microcapsules, urea resins and melamine resins.
• sizing agents used for making the supports in the present invention neutral rosin sizing agents and alkenyl succinic anhydrides are used.
• Alkyl ketene dimers cause decrease of friction coefficient of the surface of the recording papers and the recording papers are apt to slip, and thus they are not preferred from the point of running property in electrophotographic recording.
• the cationic resin As methods for adhering the cationic resin to the support, it can be coated on the support by various coating machines such as conventional size press, gate roll size press, film transfer size press, blade coater, rod coater, air knife coater and curtain coater, but from the point of cost, it is desired to adhere the cationic resin by conventional size press, gate roll size press, film transfer size press, etc. which are provided in paper making machines and finish the adhering of the resin on-machine.
• coating machines such as conventional size press, gate roll size press, film transfer size press, blade coater, rod coater, air knife coater and curtain coater, but from the point of cost, it is desired to adhere the cationic resin by conventional size press, gate roll size press, film transfer size press, etc. which are provided in paper making machines and finish the adhering of the resin on-machine.
• a binder In using the cationic resin, generally, a binder is simultaneously used.
• the binder there may be used one or more of oxidized starch, phosphoric acid esterified starch, mill converted starch, e.g., thermochemical enzyme converted starch, cationized starch or various modified starches, polyethylene oxide, polyacrylamide, sodium polyacrylate, sodium alginate, hydroxymethyl cellulose, methyl cellulose, polyvinyl alcohol or derivatives thereof.
• surface sizing agents can be optionally used for controlling the permeation of ink jet recording inks.
• a styrene/acrylic acid copolymer a styrene/methacrylic acid copolymer, an acrylonitrile/vinyl formal/acrylate copolymer, a styrene/maleic acid copolymer, an olefin/maleic acid copolymer, an AKD or a rosin.
• Cationic surface sizing agents are preferred for being used in combination with the cationic resins.
• the stock may additionally contain additives such as pigment dispersants, thickening agents, fluidity improving agents, anti-foaming agents, foaming inhibitors, releasing agents, foaming agents, penetrating agents, coloring dyes, coloring pigments, fluorescent brighteners, ultraviolet absorbers, antioxidants, preservatives, mildewproofing agents, water resisting agents, wet strengthening agents, and dry strengthening agents.
• additives such as pigment dispersants, thickening agents, fluidity improving agents, anti-foaming agents, foaming inhibitors, releasing agents, foaming agents, penetrating agents, coloring dyes, coloring pigments, fluorescent brighteners, ultraviolet absorbers, antioxidants, preservatives, mildewproofing agents, water resisting agents, wet strengthening agents, and dry strengthening agents.
• paper making machines used for making the recording papers of the present invention there may be optionally used known paper making machines such as Fourdrinier paper machine, twin-wire paper machine, combination paper machine, cylinder paper machine and Yankee paper machine.
• supports 1-4 were prepared according to the following formulations.
• LBKP freeness: 450 mlcsf
• Precipitated calcium carbonate (trademark: TP-121 manufactured by Okutama Kogyo Co., Ltd.) 10 parts
• Aluminum sulfate 1.0 part
• Amphoteric starch (trademark: Cato3210 manufactured by Japan NSC Co., Ltd.)
• Neutral rosin sizing agent trademark: NeuSize M-10 manufactured by Harima Kasei Co., Ltd.
• Yield improving agent trademark: NR-11LS manufactured by Hymo Co., Ltd. 0.02 part
• a 0.3% slurry of the above composition was subjected to paper making by Fourdrinier paper machine to prepare a support of 79 g/m 2 in basis weight.
• a recording paper of Example 2 was prepared in the same manner as in Example 1, except that the dry adhering amount of the cationic resin was 1.2 g/m 2 .
• a recording paper of Example 3 was prepared in the same manner as in Example 1, except that the dry adhering amount of the cationic resin was 2.0 g/m 2 .
• a recording paper of Example 4 was prepared in the same manner as in Example 1, except that the cationic resin used was changed to a cationic resin (trade mark: Polyfix 601 manufactured by Showa Kobunshi Co., Ltd., having a cation equivalent of 7.1 meq/g).
• a recording paper of Example 5 was prepared in the same manner as in Example 4, except that the dry adhering amount of the cationic resin was 1.2 g/m 2 .
• a recording paper of Example 6 was prepared in the same manner as in Example 4, except that the dry adhering amount of the cationic resin was 2.0 g/m 2 .
• a recording paper of Example 7 was prepared in the same manner as in Example 1, except that the cationic resin used was changed to a cationic resin (trade mark: Sumiraise Resin 1001 manufactured by Sumitomo Chemical Co., Ltd., having a cation equivalent of 3.7 meq/g).
• a recording paper of Example 8 was prepared in the same manner as in Example 7, except that the dry adhering amount of the cationic resin was 1.2 g/m 2 .
• a recording paper of Example 9 was prepared in the same manner as in Example 7, except that the dry adhering amount of the cationic resin was 2.0 g/m 2 .
• a recording paper of Example 10 was prepared in the same manner as in Example 4, except that the support 2 was used in place of the support 1.
• a recording paper of Example 11 was prepared in the same manner as in Example 5, except that the support 2 was used in place of the support 1.
• a recording paper of Example 12 was prepared in the same manner as in Example 6, except that the support 2 was used in place of the support 1.
• a recording paper of Example 13 was prepared in the same manner as in Example 4, except that the support 3 was used in place of the support 1.
• a recording paper of Example 14 was prepared in the same manner as in Example 5, except that the support 3 was used in place of the support 1.
• a recording paper of Example 15 was prepared in the same manner as in Example 6, except that the support 3 was used in place of the support 1.
• a recording paper of Example 16 was prepared in the same manner as in Example 4, except that the support 4 was used in place of the support 1.
• a recording paper of Example 17 was prepared in the same manner as in Example 5, except that the support 4 was used in place of the support 1.
• a recording paper of Example 18 was prepared in the same manner as in Example 6, except that the support 4 was used in place of the support 1.
• a recording paper of Comparative Example 1 was prepared in the same manner as in Example 1, except that the dry adhering amount of the cationic resin was 0.2 g/m 2 .
• a recording paper of Comparative Example 2 was prepared in the same manner as in Example 1, except that the dry adhering amount of the cationic resin was 3.0 g/m 2 .
• a commercially available ink jet recording electrophotographic recording-common paper (trademark: PB manufactured by Canon Sales Co., Ltd.) was used as a recording paper of Comparative Example 4.
• a commercially available paper for ink jet and electrophotographic recording (trademark: Multi-Ace manufactured by Fuji Xerox Office Supply Co., Ltd.) was used as a recording paper of Comparative Example 5.
• the surface resistivity (unit: ⁇ ) was measured using a 4329A type high resistance meter and 16008A type resistivity cell (manufactured by Yokogawa Hewlett-Packard Co.) in an atmosphere of 20°C and 65%RH with a charging time of 30 seconds.
• An image pattern for evaluation was printed using an ink jet color printer BJC-420J manufactured by Canon, Inc. After lapse of 24 hours, a drop of water was let fall on the letter image and the image was left to dry, and, thereafter, degree of spreading of the image was visually judged. Evaluation criteria are as shown below.
• the image pattern for evaluation was copied using a color copying machine Acolor 935 manufactured by Xerox Corporation, and the transferability of toner was visually judged. Evaluation criteria are as shown below.
• Continuous copying was carried out using recording papers of A4 size by a color copying machine Acolor 935 manufactured by Xerox Corporation, and the running property was judged by the number of occurrence of clogging or running with sticking to each other after 1000 copies were made. Evaluation criteria are as shown below.
• Example Adhering amount of cationic resin g/m 2
• Surface resistivity ⁇
• Water resistance of image Transferability of toner Running property Example 1 0.5 1.3x10 10 A A A A Example 2 1.2 6.1x10 9 A B A Example 3 2.0 3.4x10 9 A B A Example 4 0.5 2.2x10 10 A A A A Example 5 1.2 1.0x10 10 A A A Example 6 2.0 8.0x10 9 A B A Example 7 0.5 1.2x10 11 B A A Example 8 1.2 8.2x10 10 B A A A Example 9 2.0 2.7x10 10 A A A A Example 10 0.5 4.1x10 10 A A A Example 11 1.2 2.3x10 10 A A A Example 12 2.0 9.5x10 9 A B A Example 13 (Comparative) 0.5 1.3x10 10 A A B Example 14 (Comparative) 1.2 9.0x10 9 A B B Example 15 (Comparative) 2.0 6.5
• Example 1 0.2 8.9x10 10 C A A Comp.
• Example 2 3.0 7.7x10 9 A D A Comp.
• Example 3 0.2 4.6x10 14 C A D Comp.
• Example 4 - 1.2x10 9 D B A Comp.
• Example 5 - 1.7x10 9 D A A
• the dry adhering amount of the cationic resin is less than 0.5 g/m 2 , water resistance of images in ink jet recording was insufficient, and if it is more than 2.0 g/m 2 , water resistance of images in ink jet recording was sufficient, but since surface resistivity became lower than 1.0 ⁇ 10 9 , the transferability of toners of full color images in electrophotographic recording was deteriorated. Moreover, it can be seen that if the surface resistivity was higher than 9.9 ⁇ 10 13 , the running property deteriorated.
• the ink jet recording electrophotographic recording-common paper of the present invention is excellent in water resistance of images in ink jet recording and has good transferability of toners and good running property in electrophotographic recording due to the dry adhering amount of the cationic resin of 0.5-2.0 g/m 2 and the surface resitivity of 1.0 ⁇ 10 9 - 9.9 ⁇ 10 13 ⁇ .

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Ink Jet Recording Methods And Recording Media Thereof (AREA)
• Paper (AREA)
• Ink Jet (AREA)

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Publications (3)

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• 1998
  • 1998-07-31 JP JP21685198A patent/JP4119012B2/ja not_active Expired - Lifetime
• 1999
  • 1999-07-15 DE DE69907390T patent/DE69907390T2/de not_active Expired - Lifetime
  • 1999-07-15 ID IDW20000499A patent/ID24315A/id unknown
  • 1999-07-15 AU AU46522/99A patent/AU4652299A/en not_active Abandoned
  • 1999-07-15 EP EP99929845A patent/EP1018439B1/en not_active Expired - Lifetime
  • 1999-07-15 WO PCT/JP1999/003812 patent/WO2000003878A1/ja active IP Right Grant
  • 1999-07-15 KR KR10-2000-7002724A patent/KR100362690B1/ko not_active IP Right Cessation
  • 1999-07-15 CN CNB998010774A patent/CN1166519C/zh not_active Expired - Fee Related

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