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
  • B41M5/155—Colour-developing components, e.g. acidic compounds; Additives or binders therefor; Layers containing such colour-developing components, additives or binders

Definitions

• the present invention relates to a method for manufacturing developer sheet for carbonless reproduction paper, further detailed to a method for manufacturing developer sheet, which features that phenolic resin is used, or a system that combinedly uses phenolic resin and activated clay, and, as adhesive, cationic starch.
• carbonless paper has been publicly known among those concerned, and as described for example, in the U.S. Patent Specification Nos. 2 712 507, 2 730 465, 2 730457 etc., it utilizes both micro-capsules containing solution of organic solvent of colorless organic compound (hereinafter referred to as coupler) having electron donating property, adsorbable property and coloring reactive property and electron accepting reactive adsorbing substance (hereinafter referred to as developer).
• coupler organic solvent of colorless organic compound having electron donating property, adsorbable property and coloring reactive property and electron accepting reactive adsorbing substance
• Such a kind of developer sheet that uses phenolic resin which is an organic developer out of these developers has merits that it shows good color forming property, and excellent color-fading property, and generally it has been widely used, but at the same time it has such defects that it shows marked yellowing due to sunlight irradiation and adsorption of nitrogen oxidant present in the atmospheric air indoors.
• phenolic resin and solid acid, particularly activated clay have come to be combinedly used, but in such a case such a kind of developer sheet shows such a defect in that it is most likely to turn out markedly yellowing, and therefore the demand for improvement has been urgently desired among those concerned.
• pigments such as zinc oxide, titanium oxide, aluminum hydroxide and additives such as ultraviolet ray absorber, oxidation preventive and so on has been well known, but still found insufficient.
• water soluble adhesive such as starch, polyvinyl alcohol, gum arabic and so on and latexes such as styrene butadiene latex, acryl latex and so on have been well known among those concerned.
• starch it has been revealed in Japanese Patent Publication Nos.
• cationic starches have been put on sale in the market for internally containing, sizing press and coating for the purpose of paper making. Concerning the method for manufacturing these and its use they have been already revealed for example in the Roy L. Whistier. F. Paschall "Starch Chemistry and Technology” Vol. 2 Academic Press (U.S.A.), 1967 p. 403-420.
• the amount of cationic starch for the present invention is more than 50 wt. parts as against 100 wt. parts of phenolic resin, particularly preferably 80 - 150 wt. parts.
• combined use with latex combined use of starch oxide and latex and combined use with starch oxide cationic starches of the present invention can be effected in any way.
• phenolic resin used for the present invention there are para-phenyl phenolic resin, para-tertiary butyl phenolic resin, para-octyl phenolic resin, para-chlor phenolic resin, para-cumyl phenolic resin, its metal salts and so on, and particularly among them para-phenyl phenolic resin has high coupling density and is favorable.
• So-called activated clay is so constituted that acid clay or clay, similar to it is treated with mineral acid in such a way that alumina, iron and any other basic component soluble in acid may be deposited until its surface area shows more than 200 m 2 /g, and in case of activated clay used for the present invention it little matters whether metal salts of zinc, magnesium are admixed with it.
• pigments for the present invention any suitable amount of inorganic pigment such as calcium carbonate, zinc oxide, kaolin, clay, activated clay and so forth and organic pigment such as urea-formalin resin and so on are used.
• latex that can be combinedly used for the present invention styrene butadiene latex, vinyl acetate latex, acryl latex and so on can be used, but the present invention may not particularly be restricted to these only.
• Cationic starch for the present invention is dispersed in publicly known dispersant, additive, the aforementioned pigment, phenolic resin and latex so that it may be mixed until coating liquid is prepared and then coated on base material such as paper in such a way that developer sheet can be prepared.
• the present invention will be concretely described as follows. Besides, as coupler coated paper to sheet for carbonless reproduction paper put on sale in the market "Mitsubishi NCR paper top-40" is used.
• Coating liquid is coated on quality paper of 40 g/m 2 by means of air knife coater so that the coating amount may indicate 7 g/m 2 (solid content).

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Color Printing (AREA)

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=8188215

Family Applications (1)

Country Status (1)

Cited By (2)

Citations (2)

• 1981
  • 1981-02-13 EP EP19810300615 patent/EP0058263A1/de not_active Ceased

Patent Citations (4)

Similar Documents

Legal Events