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
  • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
  • B41M5/132—Chemical colour-forming components; Additives or binders therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
  • B01J13/02—Making microcapsules or microballoons
  • B01J13/025—Applications of microcapsules not provided for in other subclasses
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
  • Y10T428/2984—Microcapsule with fluid core [includes liposome]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
  • Y10T428/2991—Coated
  • Y10T428/2998—Coated including synthetic resin or polymer

Definitions

• a single-sheet pressure-sensitive recording material is produced by applying to a substrate an electron-acceptive adsorbent and microcapsules formed by coacervating a hydrophilic material around colorless electron donors.
• the present invention relates to a method of producing pressure-sensitive recording papers and more particularly it relates to a method of producing a pressure-sensitive recording paper by applying to the same surface thereof an adsorbable colorless organic material and an electron acceptive adsorbent.
• pressure-sensitive recording papers are composed of a capsule paper having a layer of microcapsules containing therein an electron-donor, adsorbable, and colorless organic material capable of causing color reaction or coupling reaction, such as Leucomethylene Blue, Crystal Violet Lactone, or the like and a clay paper having thereon a layer of an electron acceptive adsorbent, such as acid clay, kaolin, or the like.
• an electron acceptive adsorbent such as acid clay, kaolin, or the like.
• an object of this invention is to provide a method of producing a pressure-sensitive recording paper free from such spontaneous coloring.
• the single sheet type pressure-sensitive recording paper is prepared by applying to the surface of a paper an electronacceptive adsorbent and microcapsules containing therein an electron-donor type, adsorbable, and colorless organic material, wherein at least one of a water-soluble alkyd resin, 'water-dispersible metal soap, a water-dispersible parafiin and an aqueous emulsion of parai'fin wax and rosin is incorporated in the capsule-containing coating composition.
• a coating composition of microcapsules containing an electron-donor type, adsorbable, and colorless organic material may be prepared, for example, by the coacervation method described in US. Pat. 2,800,457.
• the coating composition prepared for example, by the aforesaid coacervation method, there is dispersed at least one of aforesaid water-soluble alkyd resin, water-dispersible metal soap, water-dispersible parafiin, and an aqueous emulsion of parafiin wax and rosin.
• the dispersion thus prepared is applied to the surface of a paper or other substrate.
• a coating composition containing an electron-donor type adsorbent is applied to the capsule-containing layer thus formed.
• the adsorbent layer may be formed on the surface of the paper before the formation of the capsule-containing layer. Further, the capsules and the adorbent may be applied in a layer together with the additives.
• the additives used in the present invention there may be illustrated DEF-922 (made by Nisshin Kagaku Kenkyu-Sho), P-Coat (Nisshin Kagaku Kenkyu-Sho), Amberlack 165 (made by Rohm and Haas Co.), Alwax (made by American Cyanamid Co.), Waxing Size (made by American Cyanamid Co.), and the like.
• the pre ferred proportion of the additive is from 5 to 15 parts by weight per parts by weight of the components used for forming the microcapsules, such as, gelatin and gum arabic, although the proportion thereof in this invention is not limited to that value.
• adsorbable colorless organic material used in this invention there may be employed Crystal Violet Lactone, Benzoyl Leucomethylene Blue, Rhodamine B Lactam, and the like, and as the adsorbent, there may be employed acid clay, montrnorillonite, bentonite, attapulgite and the like.
• the pressure-sensitive recording paper obtained by the method of this invention is completely colorless or white and is more beautiful than conventional pressure-sensitive papers of this type.
• the recording paper is partially pressed by writing, the contrast between the colored por.
• EXAMPLE 1 Dissolved into 400 parts by weight of water at 40 C. were 10 parts by weight of gelatin treated with acid and 10 parts by weight of gum arabic and in the resulting solution there was dispersed by emulsifying 40 parts by weight of a coupler oil while using 0.2 part by weight of Turkey red oil as an emulsifying agent.
• the coupler oil used above was one prepared by dissolving 2% by weight of Crystal Violet Lactone, 1.5% by weight of Benzoyl Leucomethylene Blue, and 4% by weight of Tinuvin-P (an ultraviolet absorber made by Geigy A.-G.) in an oil consisting of 4 parts by weight of chlorinated diphenyl and one part by weight of kerosene.
• the emulsification was stopped when the size of the oil drops in the system reached 5 microns.
• Water was added to the system at 40 C., until the whole weight of the system reached 900 parts by weight and the system was stirred while maintaining the temperature of the system at about 40 C. Thereafter, the pH of the system was adjusted to 4.0-4.2 by the addition of acetic acid to cause coacervation. Then, after continuing stirring for 20 minutes, the system was cooled by ice-cooled water to gel the coacervated films deposited on the surfaces of the oil drops.
• the capsule-containing coating composition thus prepared was allowed to stand for 24 hours in a tank and the supernatant liquid thus formed was removed. Then, just before coating, 10 parts by weight of cellulose powders, KD-Flock (made by Kokusaku Pulp K.K.) was added to the capsule-containing coating composition for increasing the abrasion resistance and compressive strength of the microcapsules. Then one part by weight of a water-soluble alkyd resin, Amberlack 165 (made by Rohm and Haas Co.), was added thereto for preventing spontaneous coloring of the couplers with the adsorbent described below. The resulting dispersion is designated Composition A.
• composition B 100 parts by weight of acid clay which had been activated by treating with sulfuric acid was dispersed in 350 parts by weight of water and then the pH thereof was adjusted to 8-9 by adding an aqueous 20% NaOH solution as a dispersing agent.
• the resulting dispersion is designated Composition B.
• Composition B was applied to a paper in a thickness of 5-10 g./sq. m.
• Composition A was then applied on the layer thus formed in a thickness of 4-6 g./sq. m.
• the pressure-sensitive recording paper was white and was not colored when stored for a long period of time except when it was pressed partially by writing.
• EXAMPLE 2 To Composition B in Example 1 was added a further 45 parts by weight of an aqueous 10% solution of a lowviscous polyvinyl alcohol (PVA 205 made by Kurashiki Rayon Co.), and thereafter parts by weight of an acrylic latex prepared by using a non-ionic emulsifying agent (Tocryl S-20 made by Toyo Ink Co.) was added to the solution followed by dispersing for one hour. Then, 0.5 part by weight of Quilon C (made by E. I. du Pont de Nemours & Co.) was added to the dispersion as a waterproofing agent for polyvinyl alcohol. The resulting dispersion is designated Composition B.
• PVA 205 lowviscous polyvinyl alcohol
• Tocryl S-20 made by Toyo Ink Co.
• Composition C was applied to a paper in a thickness of 5-10 g./sq. m. and then Composition A, from Example 1, was applied to the layer thus formed in a thickness of 4-6 g./sq. m.
• the pressure-sensitive recording paper thus obtained was more white and more stable than those obtained in Example 1.
• Example 2 coating Composition A was applied to the surface of a paper prior to applying Composition B.
• the pressure-sensitive recording paper thus obtained had sufficient stability and recording ability although the coloring density after pressing by writing was lower than that of the pressure-sensitive recording paper prepared in Example 2.
• EXAMPLE 4 A mixture of 20 parts by weight of Composition B and parts by weight of Composition A in Example 2 was applied to the surface of a paper in a thickness of 8-10 g./sq. m.
• the pressure-sensitive recording paper thus obtained could be sufiiciently used in practice although it was colored when preserved for a long period of time.
• EXAMPLE 5 The same procedure as in Example 1 was repeated while using DEF 922 (made by Nisshin Kagaku Kenkyu- Sho) instead of Amberlack 165. A stable and white sensitive pressure-sensitive recording paper was obtained.
• a coating composition comprising an electron-acceptive adsorbent and a coating composition comprising a plurality of distinct hydrophilic microcapsules formed by coacervation and containing an electron-donor, adsorbable and colorless organic material to the same surface of a substrate
• the improvement which comprises incorporating, prior to application to said substrate, in the coating composition which contains said microcapsules formed by coacervation from about 5 to 15 parts by weight per parts by weight of the components used for forming the hydrophilic microcapsule walls of a material selected from the group consisting of a water-soluble alkyd resin, a waterdispersible metal soap, a Water-dispersible paraffin, and an aqueous emulsion of paraflin wax and rosin, whereby the microcapsules are coated with a member from said group.
• a pressure-sensitive recording material prepared by the method claimed in claim 1.
• microcapsules are formed by coacervating a shell comprising gelatin and gum arabic around a coupler oil comprising said colorless organic material and an oily material.
• said colorless organic material is selected from the group consisting of Crystal Violet Lactone, Benzoyl Leucomethylene Blue and Rhodamine B Lactam.
• microcapsules are coacervated from a liquid and, after coacervation, are mixed with said material from said group and subsequently applied to said substrate as a dispersion.
• microcapsules are formed by coacervating a shell comprising a natural polymer around a coupler oil comprising said colorless organic material and an oily material.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Organic Chemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Dispersion Chemistry (AREA)
• Color Printing (AREA)
• Manufacturing Of Micro-Capsules (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=11589793

Family Applications (1)

Country Status (4)

Cited By (17)

Families Citing this family (2)

• 1968
  • 1968-01-23 GB GB3538/68A patent/GB1213516A/en not_active Expired
  • 1968-01-23 FR FR1551752D patent/FR1551752A/fr not_active Expired
  • 1968-01-24 DE DE1671544A patent/DE1671544C3/de not_active Expired
  • 1968-01-24 US US700037*A patent/US3554781A/en not_active Expired - Lifetime

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