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
  • B41M5/1243—Inert particulate additives, e.g. protective stilt materials

Definitions

• the present invention relates to a pressure-sensitive copying paper, and more particularly to a pressure-sensitive copying paper in which smear is prevented.
• Back technology a pressure-sensitive copying paper, and more particularly to a pressure-sensitive copying paper in which smear is prevented.
• the pressure-sensitive copying paper has a microcapsule containing an oil solution of an electron-donating colorless dye, which is a pitting agent, coated on one side of a support (for example, paper) and dried.
• a coating solution containing an electron-accepting solid acid, which is a color developer, and an agent is applied to one side of the support, and the microcapsule is applied to one side of the support.
• it consists of medium paper that has been coated on the other side with a coating solution containing an electron-accepting solid layer and an adhesive and dried.
• a self-contained type pressure-sensitive copying paper in which a color developing agent-containing microcapsule and a developer are coated on the surface of a support.
• the microcapsule has a certain amount of pressure or OMFI V / LO.
• the microcapsule is destroyed due to the frictional force, which causes abnormal coloration or contamination on the surface of the electron-accepting solid (these phenomena are called smudges).
• a substance having a particle size larger than that of microcapsules is mixed with a capsule as a capsule protective agent (hereinafter referred to as a still).
• cellulose powder, starch granules, various plastic beads, etc. correspond to this.
• starch particles in Japanese Patent Publication Nos. Sho 47-1718 and JP-B-48-332204 have considerably better properties as anti-smudge effects.
• the specific gravity of starch is 1.6, which is much larger than that of micro-powered cells (approximately ⁇ ), and the particle size is generally 20 to 30 micron.
• starch granules will precipitate, causing a change in the composition of the coating solution during prolonged coating work, and capsule coating. Variations in quality, such as surface coloration and speed, will occur.
• the color developability at a low pressure is reduced, resulting in poor color development in a large number of copies.
• Cellulose fines are obtained by mechanically and chemically crushing wood pulp, and have a size of S30 micron and a length of 100 micron. It is widely distributed around the degree, and has a specific gravity of about 1. Thus, when this is used as a still, its specific gravity is about the same as that of the microcapsule, and there is no concern about sedimentation with the coating liquid. Therefore long Even when smearing is performed for a long time, there is no change in composition, there is no fluctuation in quality, and the color development characteristics at low pressure are good. However, because of the nature of the condition, there may be cases where the friction and dirt on this is somewhat insufficient, and improvement is desired.
• the present inventor has proposed an improvement in the effect of preventing smudging in a microcapsule-cellulose fine powder system which is free from sedimentation 1 of a coating solution and has excellent low-pressure coloring properties.
• a microcapsule-cellulose fine powder system which is free from sedimentation 1 of a coating solution and has excellent low-pressure coloring properties.
• the present inventors have found that the present invention has a remarkable effect on the prevention of luggage, leading to the present invention.
• Other lubricants along with the fatty acid amide include aliphatic hydrocarbons such as zo-rafin and polyethylene; high-grade fatty acids derived from beef tallow, oak oil and the like. Acids: higher aliphatic alcohols: calcium stearate metal salts such as zinc stearate: higher fatty acid esters, etc. can be used in combination.
• the amount of cellulose powder (still) and fatty acid paste (lubricant) used is 100 parts by weight of microcapsule (hereinafter simply referred to as part).
• part 100 parts by weight of microcapsule
• 5 to 70 parts of cellulose powder is good, and less than 0.9 part of fatty acid amide has little effect, and more than 16 parts has an adverse effect on the coloring properties.
• 1 to ⁇ 5 parts is appropriate, more preferably 5 to 60 parts of t-lulose ⁇ powder, and 5 to 60 parts of fat ⁇ amide 2 to 10 parts. Ah .
• microcapsule manufacturing method that can be used in the present invention includes:
• colorless dyes for pressure-sensitive recording can be used as the colorless dye as a color former, for example, triphenylmethane, diphenylmethane, etc. , Xanthanes, thiazines, and spiropyrane compounds.
• color formers are dissolved or dispersed in a suitable oily solvent, emulsified into microdroplets in water or a hydrophilic solvent, and are micro-mixed by the above-mentioned suitable micro-capsule method. It is transformed into a cell.
• a non-volatile solvent such as an alkyl naphthalene, a diazole soletan, an alkylphenyl, a hydrogenated phenyl or an ester is used. Used.
• Examples of the electron-accepting substance that forms a color-forming layer upon contact with the color-forming agent include inorganic colorants such as acid clay, activated clay, and atapargide zeolite. , Phenols, phenol aldehyde polymers, phenol ⁇
• Aromatic carboxylic acids and their metal salts are known
• These coatings are performed at a high speed by a coater having a coater head such as an air knife, blade roll, or bar.
• the pressure-sensitive copying paper of the present invention is not limited to the separation-type pressure-sensitive copying paper shown in Examples, and the cell: 7 Contained pressure-sensitive copy paper
• Crystalline oil Reactor ⁇ 0 parts of the dye-containing oil obtained by dissolving 0 parts in disop ⁇ pyrenaphtalene 9Q part is emulsified and dispersed in the above mixed aqueous solution to obtain oil droplets.
• the temperature of the system was reduced to 55 while adding 35 parts of 37% formaldehyde in water. Two hours later, a wall film of urea-formaldehyde polymer was formed around the oil.
• NCR paper (CF) was used. Table 1 shows the results of examining the color development characteristics and the smudge characteristics with these surfaces facing the coating surface.
• HIZOL SAS 2 95 (Nippon Petrochemical Co., Ltd., a diarylethane solvent) ⁇ 2 parts of crystal bioreactor tracton in 100 parts
• the solution in which was dissolved was emulsified and dispersed, and encapsulated by a coacervation method using gelatin-arabia rubber.
• This microcapsule had an average particle size of about 0 micron and a capsule concentration of 2 ⁇ %.
• Table II shows the results of the replacement.
• Table 1 shows the results of the tests performed in the same manner.
• the coloring is the coloring density of a single type of coloring of the type
• the smudge is an index indicating the contamination of the recording layer due to friction, and is expressed by the following equation.

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• Color Printing (AREA)

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• 1983
  • 1983-04-04 JP JP58059059A patent/JPS59184695A/ja active Pending
• 1984
  • 1984-04-03 EP EP84901410A patent/EP0141856B1/de not_active Expired
  • 1984-04-03 WO PCT/JP1984/000160 patent/WO1984003860A1/ja active IP Right Grant
  • 1984-04-03 DE DE8484901410T patent/DE3472930D1/de not_active Expired
  • 1984-04-03 AU AU28102/84A patent/AU565566B2/en not_active Ceased

Patent Citations (2)

Non-Patent Citations (1)

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