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
  • B41M5/165—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 characterised by the use of microcapsules; Special solvents for incorporating the ingredients
  • B41M5/1655—Solvents
• • 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
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
  • Y10T428/24835—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including developable image or soluble portion in coating or impregnation [e.g., safety paper, etc.]
• • 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]

Definitions

• ABSTRACT A pressure-sensitive recording paper comprising a support having coated thereon a layer of color former, said color former dissolved in at least one compound represented by the following formula:
• This invention relates to a pressure-sensitive recording paper. More particularly, it relates to a pressuresensitive recording paper using a compound, in which two alkyl-substituted benzene nuclei are connected with each other through the unit 4C,,H as a solvent for a color former:
• n is an integer of from 1 to 8
• R and R each is an alkyl group having one to eight carbon atoms or a hydrogen atom
• p and q each is the number of alkyl groups
• p q being an integer of 1-3
• R and R may be the same.
• the object of the present invention is to obtain a pressure-sensitive recording paper having no unpleasant smell and toxicity, and capable of forming a color image having a higher density without giving a color fog.
• pressure-sensitive recording paper there are those comprising so-called upper paper prepared by dissolving a substantially colorless compound (hereinafter referred to as a color former) in an organic solvent, encapsulating it, and then coating the capsules onto a support; lower paper prepared by coating a color-developing material (hereinafter referred to as a color developer), which is capable of forming colored images, onto another support; and, in some cases, middle paper prepared by coating capsules containing a color former onto one side of a support and a color developer onto the other side thereof, or those containing said capsules and a color developer onto the same side of a support.
• a color former substantially colorless compound
• a color developer a color-developing material
• color is developed by locally pressing in such a way that the capsule layer comes into contact with the color developer layer to decompose the capsules located at the pressed part and to cause reaction between the color former and the color developer.
• a pressure sensitive recording paper having capsules and a color developer agent on the same surface thereof is used. color will be developed by pressing in the same way.
• active clay materials such as acid clay, active zeolite and bentonite
• organic acidic materials such as succinic acid, tannic acid, gallic acid, pentachlorphenol and phenol resin are generally used.
• malachite green lactone benzoyl leucomethylene blue, crystal violet lactone, rhodamine B lactom, 3-dialkylamino-7- alkylfluorans, 3-methyl-2,2- spirobi(benzo[f]chromene), etc. are used.
• conditions (a)-(e) are especially of importance and, if one of these conditions is not satisfied, the solvent cannot be used as a solvent for a color former.
• ethers do not satisfy the conditions of (a) and (d)
• alcohols do not satisfy the conditions of (a), (c) and (d)
• paraffins do not satisfy the conditions of (a)
• ketones, esters, olefins and amines do not satisfy the conditions of (d)
• organic acids do not satisfy the conditions of (c)
• usual aromatic hydrocarbons do not satisfy the conditions of (a), (g) and (h).
• the pressure-sensitive recording paper wherein low chlorinated trichlorodiphenyl and tetrachlorodiphenyl are used, has the defect of having an unpleasant smell.
• the pressure sensitive recording paper wherein highly chlorinated pentachlorodiphenyl and hexachlorodiphenyl are used, has the defect in that the effusion thereof is difficult to be freely done due to their high viscosity and that sufficient color density cannot be obtained, while they have less of an unpleasant smell.
• the pressure-sensitive recording paper wherein the mixture of chlorinated diphenyl with a low chlorination degree and the same with high chlorination degree is used is a little more improved in the smell than that wherein chlorinated diphenyl with low chlorination degree is used separately and, in the density of the color formed, the former is a little more improved than that wherein highly chlorinated diphenyl is used independently, but the former has still considerable unpleasant smell and the density of color formed is not sufficient.
• chlorinated diphenyl is slightly decomposed by light to form hydrogen chloride.
• the capsule coated sheet wherein chlorinated diphenyl is used has the defect that, when it is exposed to light for a long time, the generated hydrogen chloride will be reacted with the color former to cause colored fog. Furthermore, this capsule coated sheet wherein the colored fog took place has less color developing ability onto the lower paper, and a sufficient density of the color formed cannot be obtained. Besides, chlorinated diphenyl has appreciable toxicity to human beings and animals.
• the conventional pressure sensitive recording paper wherein chlorinated diphenyl is used has had the defects that it has unpleasant smell, that sufficient density of the color formed cannot be obtained, that when exposed to light for a long time, colored fog on capsule coated sheet and the lowering of the color developing ability thereof to the lower paper take place, and that it has a problem in its toxicity.
• the present invention is characterized in that, in the pressure sensitive recording paper, the compound represented by the general formula (I) is used as a solvent for the color former, separately or in combination with other solvents.
• the compound (I) in this invention is characterized in that two alkyl substituted benzene nuclei are connected with each other through a -(-C,,H bond and, as is different from the usual aromatic compounds, the compound (I) of the present invention has a considerably high boiling point, does not vaporize off in a heat drying process or in a place of the elevated temperature, has no unpleasant smell, and in addition, it has no toxicity to human beings and animals.
• the reason why the number of the carbon atoms contained in R and R, and that in the (-C,,H existing between the two benzene nuclei is not more than 8 and 8, respectively, is that, when the number of the carbon atoms contained in R and R becomes not less than 9 and n becomes not less than 9, the viscosity thereof conspicuously increases and the solubility of a color former thereto decreases, which is not desirable.
• the compound of this invention having a particularly restricted structure, satisfies the aforesaid conditions of (a)(e) demanded for a solvent for the color former of pressure sensitive recording paper.
• it has the excellent advantages that there is little rise in viscosity, even at a low temperature, that it has no unpleasant smell or toxicity to human beings and animals, that it raises the stability of the capsule coated sheet to light, that, even when the capsule coated sheet is exposed to light for a long time, the colored fog of the sheet is remarkably less compared with conventional ones, that the color developing ability in developing this capsule coated sheet onto the lower paper does not decrease like the conventional ones, and the like.
• the pressure sensitive recording paper of this invention is excellent also in that it has a higher density with respect to the color formed compared with conventional pressure sensitive recording paper, wherein chlorinated diphenyl is used. Therefore, it can be said that the compound (I) used in the present invention having a particularly restricted structure is extremely excellent as a solvent for a color former of pressure sensitive recording paper.
• the compound of the general formula (I) of the present invention may be used in combination with other solvents.
• solvents to be mixed together there are petroleum fractions such as liquid paraffin, kerosene, naphtha, etc., synthesized oils, such as chlorinated paraffin, chlorinated diphenyl, hexahydroterphenyl, alkylnaphthalenes, alkylated polyphenyls, etc., and vegetable oils, such as cotton seed oil, linseed oil, etc.
• solvents are mixed and used together in order to adjust the viscosity, to control the solubility of a color former, and to increase the quantity for the reduction of cost, etc.
• This invention is characterized by using the compound of the general formula (I) having a particularly restricted structure as a solvent for a color former of pressure sensitive recording paper and, accordingly, all of the publicly known art can be applied as a method or process for encapsulating this solvent. Therefore, the present invention is not restricted by the method or process for the encapsulation.
• a clay paper (lower paper) prepared as follows. That is, g of sulfuric acid processed acidic terra abla was dispersed in 280 g of water containing 6 g of 40 percent sodium hydroxide aqueous solution using homogenizer. Thereafter, 50 g ofa 10 percent aqueous solution of sodium salt of casein and 30 g of a styrene butadiene latex (trade name: Dow Latex 626, made by Dow Chemical Co.), were added thereto as a binder, and coated on a paper by air knife coating, and dried to obtain the clayed paper.
• a styrene butadiene latex trade name: Dow Latex 626, made by Dow Chemical Co.
• Example 2 Example 2
• the upper paper thus obtained had no unpleasant smell like that of the conventional pressure sensitive recording paper.
• This upper paper was superposed on a clay paper and writing was conducted with pressure, there was developed red image on a clay paper in a moment.
• the density of color developed image was remarkably high compared with that of the conventional recording paper wherein chlorinated diphenyl was used. Besides, even when this upper paper was exposed to sun light for a long time, the lowering in the color developing ability and fog were not observed.
• Example 1 20 g of paraffin containing l0-l2 carbon atoms, treated in the same was as in Example 1 to obtain upper paper.
• the upper paper for pressure sensitive recording paper thus obtained had no unpleasant smell like that of the conventional pressure sensitive recording paper prepared by the analogous treatment using chlorinated diphenyl.
• this upper paper was superposed on a clay paper and writing was conducted with pressure, there was developed a red image on a clay paper.
• the density of this color developed image was remarkably high compared with that of the conventional pressure sensitive recording paper wherein chlorinated diphenyl CaHn was used.
• this upper paper was exposed to sun light for a long time, the lowering in the color developing ability and colored fog were not observed.
• the capsule solution thus obtained was coated on a paper by way of roll coating, then dried.
• the upper paper obtained in this way did not have the unpleasant smell like that of the conventional pressure sensitive recording paper obtained by the analogous treatment using chlorinated diphenyl.
• This upper paper was superposed on a clay paper and writing was conducted, there was developed a blackish green image on a clay paper.
• the density of this color developed image was remarkably high compared with that of the conventional pressure sensitive recording paper wherein chlorinated diphenyl was used. Furthermore, even when this upper paper was exposed to sun light for a long time, the lowering in the color developing ability and colored fog were not observed.
• Example 1 was duplicated using 2-methyl-5-isopropyldiphenylmethane (having a boiling point of 307 3 lOC and specific gravity of 09916 at 20C) instead of 2,4-dimethyldiphenylmethane, and using 3-methyl- 2,2-spirobi(benzo[ flchromene) instead of crystal violet lactone. The result thereof was the same as in Example 1.
• Example 1 was duplicated, except that 1,1-diphenyll-heptylmethane (having a boiling point of l43-l45C/0.l mml-lg, a melting point of to --4C and a specific gravity of 0.9444 at 20C) was used instead of 2 ,4-dimethyldiphenylmethane. The result thereof was the same as in Example 1.
• R and R each represent a member selected from the group consisting of alkyl groups containing one to eight carbon atoms, and a hydrogen atom
• p and q represent the number of alkyl groups
• p q being an integer of 1 to 3
• R and R may be the same.
• Example 9 Example 1 was duplicated, except that dimethyl-tbutyldiphenylmethane (mixture of several kinds of isomers, having a boiling point of l3 2l 48C/0.l mmHg) 3.
• the pressure sensitive recording paper of claim 1 wherein said compound is used as a mixture with a solvent selected from the group consisting of a petroleum fraction, a synthetic oil and a plant oil.
• the pressure sensitive recording paper of claim 3, wherein said synthetic oil is a member selected from the group consisting of chlorinated paraffin, chlorinated diphenyl, hexahydroterphenyl, alkylnaphthalenes and alkylated polyphenyls.

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• Color Printing (AREA)

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Family Applications (2)

Family Applications After (1)

Country Status (6)

Cited By (19)

Families Citing this family (8)

Citations (6)

Family Cites Families (2)

• 1970
  • 1970-10-27 JP JP45094877A patent/JPS492126B1/ja active Pending
• 1971
  • 1971-10-22 GB GB4931271A patent/GB1346364A/en not_active Expired
  • 1971-10-26 ES ES396370A patent/ES396370A1/es not_active Expired
  • 1971-10-27 US US00193151A patent/US3836383A/en not_active Expired - Lifetime
  • 1971-10-27 DE DE2153634A patent/DE2153634C3/de not_active Expired
  • 1971-10-27 IE IE1367/71A patent/IE36768B1/xx unknown
• 1976
  • 1976-09-17 US US06/724,186 patent/USRE33113E/en not_active Expired - Lifetime

Patent Citations (6)

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