EP0093208A1 - Papier de copiage chimique amelioré sans carbone et milieu de transfert - Google Patents

Papier de copiage chimique amelioré sans carbone et milieu de transfert Download PDF

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Publication number
EP0093208A1
EP0093208A1 EP82302223A EP82302223A EP0093208A1 EP 0093208 A1 EP0093208 A1 EP 0093208A1 EP 82302223 A EP82302223 A EP 82302223A EP 82302223 A EP82302223 A EP 82302223A EP 0093208 A1 EP0093208 A1 EP 0093208A1
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EP
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Prior art keywords
wax
transfer medium
medium according
chloride
coating
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP82302223A
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German (de)
English (en)
Inventor
Gerry H. Ehrhardt
Gene David Carlson
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Frye Copysystems Inc
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Frye Copysystems Inc
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Application filed by Frye Copysystems Inc filed Critical Frye Copysystems Inc
Priority to EP82302223A priority Critical patent/EP0093208A1/fr
Publication of EP0093208A1 publication Critical patent/EP0093208A1/fr
Withdrawn legal-status Critical Current

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    • 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

  • This invention relates to pressure sensitive information transfer and duplicating systems and particularly to improved chemical type transfer and reproduction media for effecting duplicative image transfer on sheet material in response to selectively applied pressure and to processes for forming the same.
  • Pressure sensitive image transfer media of diverse character are widely employed in the information recording and duplicating arts.
  • Chemical type or so-called "carbonless" pressure sensitive transfer and duplicating systems wherein a visable image is formed by the selective chemical reaction of two essentially colorless reagents, have been long recognized as a viable expedient for the formation of duplicate copy material.
  • Such systems normally broadly comprise a substrate supported coating that contains a first normally inactive chemical reagent material that is selectively transferable in response to applied pressure into a reaction providing and color producing relationship with a second normally inactive chemical reagent material contained within or comprising a second coating disposed on the surface of an interfacially contiguous second substrate.
  • the coatings on a CB and a CF sheet are placed in interfacially contiguous relation and subjected to selectively applied pressure, as by the pressure of a stylus or the impact of a typewriter key on the obverse surface of the CB sheet, the operative and usually colorless chemical reagents in such coatings are brought into co-reactive relationship, as for example on the surface of the CF sheet, to produce a colored image conforming to the contour of the selectively applied pressure member.
  • Such chemical type pressure sensitive transfer and duplicating systems are in widespread and expanding use at the present time for the making of multiple copies of selectively recordable duplicative information on sheet material, such as paper and the like, due, at least in part, to their basic cleanliness and to the fact that the color producing reagents are inactive until placed into operative co-reactive relationship in response to selective application of pressure.
  • the application of pressure effects a rupture of the liquid dyestuff confining capsular elements in the area of applied pressure to effect a release of the dye precursor material and selective transfer of at least a portion thereof into co-reacting and color producing relationship with the electron accepting material in the contiguous coating on the CF sheet with the resulting formation of a duplicative image thereon.
  • Such "carbonless" transfer media as presently commercially employed and particularly those that conventionally employ an encapsulated type vehicle for one of the reactive constituents, most usually an organic dyestuff, are not without disadvantage.
  • disadvantages of such media are the fact that they are not only relatively expensive, requiring specialized fabricating techniques, but are also unduly pressure sensitive. Such undue sensitivity-often results in undesired premature transfer occasioned by inadvertent dye precursor release and transfer resulting from pressures normally attendant packaging, handling and processing operations, spot coating delineation, printing operations and the like, particularly where multicopy manifolding operations are involved.
  • such media are inherently subject to a progressively increasing lack of copy definition as the number of desired copies increases as well as by a fading of the copied image with time.
  • the Shackle and Young patent and the Davis and Shackle patent stress the "non-aqueous" and “solvent free” character of the.assertedly novel hot melt coating compositions, apparently based upon the asserted disadvantages flowing from the presence of water both in the fabrication process and in the finished product.
  • the Davis and Shackle patent discloses the preferred use of microcapsular chromogenic reagent materials in the CB coating although the process claims are not expressly limited thereto.
  • the Shackle and Young patent is expressly directed to a hot melt CF coating, the vehicular form of the acidic electron accepting type of color developer, i.e. whether micro- encapsulated, capsulated, dispersed or other form, is not particularly specified. It is relatively clear, however, that the described CF product is intended for use with CB sheets incorporating an organic dyestuff dye precursor in encapsulated form and, as such, represents an asserted improvement for the capsular type systems presently in widespread commercial use.
  • an organic dyestuff dye precursor is dispersed in a binder on the CF sheet and used in conjunction with an essentially fully transferable CB sheet coating which incorporates clay materials as the electron accepting chromogenic reagent material, either alone or in association with phenolic material and inorganic salts of multivalent metals.
  • Solvent, water based and hot melt systems are specifically disclosed for the CB sheet coatings.
  • the hot melt CB sheet coatings are all water free, again in conformity with the Shackle teachings.
  • the subject invention includes a novel hot melt CB coating constituted of an intermixture of natural and synthetic waxes containing and retaining discrete microscopic droplets of a selectively constituted solution of a metallic chloride, preferably zinc chloride in water suitably buffered to minimize, if not effectively neutralize, the available-acidic chloride content thereof uniformly distributed therewithin as a color producing reagent.
  • the invention includes a compatible improved CF sheet coating having a plurality of water insoluble dye precursors in solid form selectively dispersed and distributed throughout an alkaline biased carrier film.
  • the subject invention Among the manifold advantages attendant the practice of.the subject invention is the provision of improved-low cost carbonless transfer media that serve to provide markedly increased numbers of duplicative copies with sharper, more intense.and highly smear resistant transferred images. Additional advantages include compatability with "one time" carbon papers and standard printing inks; a permitted reduction in basis weights and the provision of an odorless . CB sheet coating that can be reused one or more times, thus permitting retyping on the obverse surface thereof. Other advantages include the provision of a CB sheet coating that can be readily striped and spot coated and which is recyclable. Still other advantages include the provision of a CB sheet coating that can be fabricated with minimal energy requirements on conventional coating equipment requiring minimal capital investment.
  • Still further advantages include the provision of transferred images that are effectively stable in character and a system which is operable at temperatures as low as -30°F. Still further advantages include the provision of coatings of extended shelf life that are markedly resistant to undesired premature activation under conditions of high temperature and/or high humidity; that are characterized by: reduced potential to irritate sensitive skins and to corrode iron rollers and other components of coating, printing and collating apparatus; coatings that are essentially uncritical as to substrate character and which are highly resistant to undesired transfer on printing presses, collators and other equipment normally incident to manifolding, printing and packaging operations.
  • a principal object of this invention is the provision of improved chemical type pressure sensitive transfer and reproduction media, to processes for fabricating the same and to improved systems employing such media.
  • a further principal object of this invention is the provision of an improved hot melt chromogenic reagent containing coating composition for CB transfer sheets.
  • Another object of this invention is the provision of an improved composite wax base hot melt type of CB sheet coating containing discrete droplets of a selectively constituted water solution of a metallic chloride suitably buffered to minimize, if not effectively neutralize, the available acidic chloride content thereof uniformly distributed therewithin as a color producing reagent.
  • a further object of this invention is the provision of an improved water base metallic chloride solution for use as electron accepting chromogenic reagent material in carbonless transfer systems that is effectively non-corrosive .and non-irritating and which is highly resistive, when . dispersed in a hot melt carrier vehicle, to undesired premature image actuation under conditions of high temperature and/or high humidity.
  • a still further object of this invention is the provision of an improved water base metallic chloride solution for use as electron accepting chromogenic.reagent material in carbonless transfer systems.
  • Figure 1 is a schematic representation of chemical type pressure sensitive transfer and reproduction media incorporating the principles of this invention.
  • Figures 2a and 2b are photomicrographs (4200X and 14000X) of an improved hot melt CB coating formed and constituted in accordance with the principles of this invention.
  • a CB sheet comprising a first planar substrate 10, suitably a paper sheet or web, having a thin solidified hot melt CB coating 12, constituted as hereinafter described, disposed on the undersurface thereof.
  • a CF sheet coating 16 disposed on the upper surface of a second paper sheet substrate 14.
  • Such substrate 14 may have its undersurface coated with a CB coating 12 and thus constitute a CFB sheet, or may have an uncoated undersurface and thus constitute a CF sheet.
  • a CB coating 12 on the underside of the "CEB” sheet 14 or with a CB coating 12 on the underside of the "CB” sheet 10 is a separately illustrated "CF" sheet having a CF coating 16 disposed on the upper surface of a third substrate 18.
  • any number of intermediate CFB sheets or webs 14 may be interposed in stacked relation to form a multilamina transfer and . reproduction system.
  • such multilamina set may include one time carbon transfer sheets interposed with uncoated or CB coated sheets or webs in a manifold arrangement in accord with the dictates of the user thereof.
  • the novel and improved hot melt CB sheet coating broadly comprises the resulting set or solidified film from an applied and subsequently cooled emulsified liquid intermixture of a melted low oil content wax carrier vehicle, preferably of composite character, a melted synthetic flow wax and dispersant and a chromgenic reagent solution of a metallic chloride, preferably zinc chloride, dissolved in water and suitably buffered to minimize, if not effectively neutralize the available acidic chloride content thereof; said emulsified intermixture also desirably having uniformly dispersed therein small but critically limited amounts of a resinous film forming agent to promote film hardness and toughness, an isolating agent to minimize, if not effectively preclude, undesired transfer of the coating or portions thereof in response to unintentional pressure application and an opacifier-filler to reduce the gloss of the finished copy and preserve the appearance of the substrate.
  • a resinous film forming agent to promote film hardness and toughness
  • an isolating agent to minimize,
  • the subject invention includes a hot melt CB sheet coating composition formed of about 35 to 75 percent of a meltable low oil content synthetic or naturally derived hard wax vehicle; at least 1 to about 15 percent of a chemically modified wax-like material having properties of a flow agent, dispersant and emulsifier; and at least 10 to about 35 percent of a chromogenic reagent component in the form of a Lewis acid, desirably an electron accepting hygroscopic, if not actually deliquescent, metallic salt together with an amount of water necessary to desirably form a relatively concentrated solution thereof.
  • a hot melt CB sheet coating composition formed of about 35 to 75 percent of a meltable low oil content synthetic or naturally derived hard wax vehicle; at least 1 to about 15 percent of a chemically modified wax-like material having properties of a flow agent, dispersant and emulsifier; and at least 10 to about 35 percent of a chromogenic reagent component in the form of a Lewis acid, desirably an electron accepting hyg
  • Such optional constituent comprises a film forming agent to encourage the formation of a harder and tougher surface film after setting and to thus minimize premature actuation of the color producing reaction.
  • This film forming agent must be non-reactive with the chromogenic reagent and may vary in amount from a minimum of about 2% up to an amount that deleteriously effects the flow characteristics of the mix.
  • Another such optional but yet desirable constituent comprises an isolating agent that is essentially incompatible with the wax vehicle when solidified and which serves to provide desirable surface characteristics to the resultant film, such as to minimize, if not effectively preclude, undesired transfer of the coating or portions thereof in response to unintentional pressure application.
  • the isolating agent may vary in amount from a desirable minimum of about 2% up to a maximum of about 20%.
  • a still further optional but desirable constituent is an opacifier-filler to enhance the appearance-of the coated surface of the CB sheet, such as by reducing the . gloss thereof.
  • such opacifier-filler may vary in amount required to provide a desired appearance, typically about 5%, and mayinclude titanium dioxide, various non-acidic high brightness clays, lithopone or other recognized materials.
  • the meltable wax vehicle may suitably comprise any of the low oil content paraffin waxes, microcrystalline waxes, carnauba, Montan or other conventionally employed low oil content vegetable, synthetic or mineral derived hot melt wax type carrier vehicles.
  • the presently preferred meltable wax vehicle a composite made up of about 3 to 4 parts of a low oil content paraffin wax, intermixed with about 1 part or less of carnauba wax.
  • a presently preferred paraffin wax is a low oil content, high melting point, fully refined paraffin wax, suitably Pacemaker 53 as manufactured and sold by Cities Service Oil Co. of Tulsa, Oklahoma.
  • Such wax has the following properties:
  • suitable low oil content hot melt wax carrier vehicles include alpha olefinic waxes, suitably #6817 Synthetic Wax as available from Moore & Munger Inc. of Fairfield, Connecticut; microcrystalline wax, suitably 195 Be Square White, available from Petrolite Corporations Bareco Division; carnauba wax, suitably Brazilian Refined available from Baldini & Company of Milburn, New Jersey.
  • Bareco's 195 Be Square White microcrystalline wax has the following properties:
  • a preferred carnauba wax is Baldini's Brazilian Refined Carnauba wax that is possessed of the following properties:
  • the meltable chemically modified wax-like material having the desired properties of a flow agent, dispersant and emulsifier most suitably comprises a material of the type disclosed in U.S. Patent No. 3,941,608.
  • Other suitably chemically modified wax materials having the somewhat similar properties include modified synthetic waxes as discolsed in U.S. Patent Nos. 2,890,124, 2,890,125 and 3,163,548.
  • a preferred commercially available wax-like material formulated in accord with U.S. Patent No. 3,941,608 is #7315 wax as sold by Moore & Munger, Inc., of Fairfield, Connecticut. Such #7315 wax has the following general properties:
  • Another suitable wax-like material having somewhat similar properties as the foregoing suitably comprises an amide of a fatty acid, such as Armid HT as available from Armour Industrial Chemical Company.
  • Armid HT is possessed of the following properties:
  • the resinous film forming agent serves to enhance the formation of a relatively hard and tough coating to minimize undesired transfer of reagent material across the CB/CF interface in the absence of intentional positive pressure application.
  • a suitable film forming agent which must be non-reactive with the chromogenic reagent component, desirably comprises a relatively low melting point ethylene-vinyl acetate copolymer, such as AC-400, as manufactured and sold by Allied Chemical Corporation.
  • Such resinous film forming agent has the following properties:
  • Another suitable film forming agent comprises oxidized polyethylene, suitably AC-629 as manufactured and sold by Allied Chemical Company.
  • Such film forming agent has the following properties:
  • the isolating agent cooperatively functions as blooming agent to provide a lubricating and barrier surface to the solidified coating.
  • Such isolating agent which should be essentially incompatible with the wax carrier vehicle when solidified, so as to be selectively effective at the exposed surface, suitably comprises a small amount of stearic acid, desirably HYSTRENE 9718 as manufactured and sold by the Humko Chemical Company. Zinc stearate may also be employed.
  • the opacifier-filler which cosmetically serves both to reduce the gloss of the finished coating and to preserve the appearance of the substrate, suitably comprises finely divided titanium dioxide such as UNITANE 0-110 as manufactured and sold by American Cyanamid Company. This material has a specific gravity of about 3.9 and is so finely divided as to leave only about a 0.10% residue on a 325 mesh screen.
  • the chromogenic reagent component preferably comprises a concentrated water base solution of zinc chloride as the electron accepting metallic chloride, suitably buffered to minimize, if not effectively neutralize, the available acidic chloride content thereof.
  • a concentrated water base solution of zinc chloride as the electron accepting metallic chloride, suitably buffered to minimize, if not effectively neutralize, the available acidic chloride content thereof.
  • Such solution is preferably made.up of about 2 to 4 parts of zinc chloride with about 1 part of water and which approaches a saturated solution.
  • chromogenic reagent components comprise concentrated water base solutions of metallic halogen salts such as stannous chloride, ferric chloride, lithium bromide and nickel chloride.
  • a neutralizing ammonium salt suitably ammonium carbonate or ammonium bicarbonate
  • a neutralizing ammonium salt for a concentrated solution of about 2 parts of zinc chloride to 1 part of water, about .1 part of such neutralizing ammonium salt is generally satisfactory.
  • the addition of about 2 to 4% of ammonium carbonate to zinc chloride solutions of the type herein disclosed results in effective avoidance of the above problems in an improved product.
  • ammonium salt operates to neutralize or otherwise reduce the available active or acid chloride ion content and to thus preclude its association with available hydrogen ions.
  • ammonia in both the liquid and gaseous phase may also contribute to the neutralization of hydrogen chloride in both such phases.
  • Such unexpected results are a bleaching and a marked increase in the hardness of the solidified CB hot melt coating.
  • Such increase in hardness not only functions to minimize pick off on processing components, reduces the tendency to smear and provides sharper copy, but also permits of significant reduction in the quantity of carnauba wax that is otherwise desirably included therein.
  • Carnauba wax is not only one of the more cost significant components of the coating but is also only obtainable from a foreign source of supply who controls the ever increasing price thereof.
  • the unexpected bleaching action also enhances the appearance of the product through an enhancement of the "whiteness" of the coating.
  • a presently preferred hot melt CB sheet coating broadly comprises the resulting set or solidified film from an applied and subsequently cooled emulsified liquid intermixture of about 50-60% of a melted low oil content composite wax carrier vehicle, made up of about 3 to 4 parts of a low oil content paraffin wax intermixed with about 1 part of carnauba wax; about 2 to 5% of a chemically modified synthetic flow wax and dispersant and about 25-35% of a chromogenic reagent solution of at least 2 parts of zinc chloride dissolved in about 1 part of water buffered by a small amount of ammonium carbonate as outlined above; said emulsified intermixture also desirably having uniformly dispersed therein about 3 to 10% of a resinous film forming agent to promote film hardness and toughness, about 3-10% of an isolating agent to minimize, if not effectively preclude, undesired transfer of the coating or portions thereof in response to unintentional pressure application and about 5% of an opacifier-f
  • the requisite amounts of the electron" accepting metallic chloride, preferably ZnCl 2 , and water are intermixed in a reaction vessel, suitably a steam jacketed kettle having a 210°F temperature setting, to form a hot concentrated solution thereof.
  • a reaction vessel suitably a steam jacketed kettle having a 210°F temperature setting
  • the neutralizing ammonium salt preferably ammonium carbonate.
  • the requisite amounts of melted low oil content paraffin wax and carnauba wax components of the composite wax carrier vehicle are added and thoroughly intermixed as by use of a high speed dispersing blade for about 10 minutes or longer.
  • the flow wax and dispersant constituent and the polyethylene filming agent and stearic acid isolating agent constituents are added in solid form with continual mixing until such constituents are completely melted and dissolved in the compoite wax carrier vehicle.
  • the opacifier-filler preferably titanium dioxide is added and the entire mass thoroughly mixed at high speed for 30 to 40 minutes to form a selectively constituted liquid hot melt emulsion.
  • the resulting liquid hot melt emulsion is readily and selectively applied in the form of a thin film, as for example at a coating weight of as low as 2 grams/square meter, by conventional means to the surface of a substrate, such as a sheet or web of paper or resinous film.
  • the conventional coating means may comprise a print type coater, a roll coater or the like.
  • the so coated substrate is then passed over a chill roll or the like to rapidly solidify or set the applied emulsified coating composition.
  • the system of the present invention contains and retains water as an operative element in discrete droplet liquid form within the solidified CB film and thus effects the selective transfer of ionized zinc chloride as the operative entity.
  • Photomicrographs of coatings formulated in accord with the principles of this invention are shown in Figures 2a and 2b at magnifications of 4200X and 14000X respectively. These photomicrographs clearly depict the presence of discrete, microscopically sized zinc chloride ammonium salt solution globules distributed throughout the coating. Most of such globules are less than 1 micron in diameter with the great majority thereof falling between .25 and .75 microns. Such photomicrographs further show that such zinc chloride solution globules peripherally incorporate an interface layer or the like that differs, at least in some physical respects from both the zinc chloride solution globules and from the surrounding solidified wax material as evidenced by the clearly different refractive indices involved.
  • the foregoing described method of formulation provides a selectively constituted emulsion in which zinc chloride solution entities are thoroughly dispersed within the film.
  • the basic hygroscopic, if not actual deliquescent, properties of zinc chloride and the nature of the resultant film serve to minimize, if not effectively prevent, water loss in storage with enhanced operating life for the product.
  • Another factor which contributes to the retention of the dispersed zinc chloride solution in discrete liquid globular form within the CB film is the enhanced emulsification obtained through the use of an essentially alkaline and amino containing dispersant - flow wax constituent in association with the relatively high acid number wax and film forming components.
  • hot melt CB coatings may be employed with effectively all CF coatings that incorporate an organic dyestuff or other chromogenic reagent color precursor that will react with the ionized electron accepting metallic salt when the latter is introduced into operative relation therewith.
  • an organic dyestuff or other chromogenic reagent color precursor that will react with the ionized electron accepting metallic salt when the latter is introduced into operative relation therewith.
  • suitable CF coatings comprise the solid residue of an applied alkaline homgeneous mixture of an evaporable liquid carrier, a chemically neutral or alkaline resinous binder, an organic color precursor and an opacifier-filler.
  • Such solidified CF coatings are further characterized by the presence of the organic color precursor in solid form and which is insoluble in the liquid electron accepting chromogenic reagent solution contained in the CB coating.
  • a dispersant to assure the uniform dispersion of the color precursor throughout the mix and a thickener to provide the requisite viscosity properties to facilitate the coating of the mix in accord with the particular requirements of the coating equipment employed.
  • the evaporable liquid vehicle may comprise water or numerous organic solvents or mixtures thereof such as ethyl alcohol, methyl ethyl ketone, toluene and the like.
  • the opacifier-filler may constitute titanium dioxide, zinc oxide, lithopone, calcium carbonate or neutral clays or intermixtures thereof.
  • a preferred CF coating employs water as the evaporable liquid vehicle and generally comprises the solid residue of an applied water based intermixture, such intermixture comprising about 3 to 20 parts of a chemically neutral or alkaline resinous binder, suitably polyvinyl acetate; about 10 to 40 parts of an opacifier-filler; about .5 to 5 parts of a water insoluble acid reactable organic color precursor mixture and about 30 to 70 parts of water.
  • a chemically neutral or alkaline resinous binder suitably polyvinyl acetate
  • an opacifier-filler about .5 to 5 parts of a water insoluble acid reactable organic color precursor mixture and about 30 to 70 parts of water.
  • the presently preferred color precursor comprises a mixture of water insoluble, alkaline stable and acid sensitive organic dyestuffs to produce a dark light stable and lasting image.
  • crystal violet lactone suitably about 0.7 parts thereof, which provides for rapid reaction and image production, together with about an equal amount of a blue/black dye precursor, and lesser amounts of a red color dye precursor, suitably about 0.2 parts thereof and a blue dye precursor, suitably about 0.4 parts thereof to provide for desired image color and a high degree of light stability and increased useful life.
  • a suitable crystal violet lactone comprises Brilliant Violet Leuco (CVL) as manufactured by Hilton Davis Chemical Co.
  • This dye precursor is believed to be 6-dimethylamino-3,3-bis(p-dimethylaminophenyl)phthalide having a molecular formula of C 26 H 29 N 3 0 2 and a molecular weight of about 415.5.
  • the blue/black dye precursor suitably comprises Copykem VI as manufactured by Hilton Davis Chemical Co. and the blue dye precursor suitably comprises Reacto Blue B as manufactured by BASF.
  • a preferred resinous binder material comprises polyvinyl acetate emulsion, suitably Airflex 456 as manufactured by Air Products & Chemicals Company.
  • Another suitable binder material comprises an acrylic emulsion, for example Rhoplex P-376 as manufactured by Rohm & Haas Corp.
  • the opacifier-filler which serves both to enhance the appearance of the coating and to cooperate in the uniform distribution and spaced separation of the solid color precursor in the CF coating must also be of neutral or alkaline character.
  • Such filler may suitably comprise calcium carbonate such as Albaglos as manufactured by Chas. Pfizer & Co. This material has a pH of 9.4, a specific gravity of 2.7 and an average particle size of about .75 microns.
  • Another suitable opacifier-filler is UNITANE 0-110 titanium dioxide as manufactured by the American Cyanamid Company. This material has a minimum Ti0 2 content of 99%, a pH of about 7.7 and a specific gravity of about 3.9.
  • a presently preferred dispersant comprises sodium salt of polymeric carboxylic acid, such as Tamol 850 as manufactured by Rohm & Haas Company of Philadelphia, Pa. This material has a pH of about 9.8 and a specific gravity at 25° of 1.19.
  • the organic dyestuff dye precursor chromogenic reagent component is introduced into this mixture, again with continuous agitation to effect a complete and uniform dispersion of the dye precursor particles within the liquid intermixture.
  • the resultant emulsion-dispersion is readily and selectively applied by conventional coating equipment in the form of a thin film to the surface of a substrate, such as a sheet or web of paper or of resinous film. When so applied, the water is then evaporated from the mixture and residue constitutes the improved CF coating.
  • Such CF sheet coating may also comprise the solid residue of an applied intermix of an evaporable solvent carrier, suitably 35 to 75 parts of 95% ethyl alcohol and at least about 3 parts of methyl ethyl ketone, having dissolved therein at least about 5 parts of a binder, suitably polyvinyl acetate.
  • a dispersant and about 0.1% of dry potassium hydroxide to provide an alkaline cast to the mix and to minimize inadvertent color reactions on the CF coated sheet.
  • an opacifier-filler suitably finely divided titanium dioxide and about 15 parts of calcium carbonate.
  • Starch such as corn starch, may also be included, in lieu of or in addition to, portions of opacifier-filler to serve as a spacing agent. While any suitable chromogenic reagent material may be employed, satisfactory results have been obtained through the incorporation therein of small but critical quantities of a primary organic dyestuff dye precursor, such as about .5 to 2 parts of crystal violet lactone. Preferably, additional organic dyestuff dye precursor materials serving as color modifiers and intensifiers may also be included in the chromogenic reagent material, suitably red and blue/black color organic dyestuff dye precursors.
  • a preferred binder material which is readily soluble in the above described composite evaporable solvent carrier comprises polyvinylacetate, suitably Vinac B-15, as manufactured by Air Products & Chemicals Company.
  • '-A presently preferred dispersant comprises sodium salt of polymeric carboxylic acid such as Tamol 731 as manufactured by Rohm & Haas Company of Philadelphia, Pa.
  • the chromogenic material may be of conventional character and a presently preferred material comprises "Brilliant Violet Leuco” (CVL) as manufactured by the Hilton Davis Chemical Company of Cincinnati, Ohio..
  • a liquid mixture is first formed by (a) intermixing the ethyl alcohol and methylethylketone solvents; then (b) the polyvinyl acetate binder material, the dispersant, the potassium hydroxide (to cast the pH of the solution to the alkaline side) are added with continuous agitation until completely dissolved after which (c) the organic dyestuff dye precursor materials are added with continued stirring until dissolved.
  • To the above liquid mixture is then added the requisite amounts of calcium carbonate and the titanium dioxide opacifier-filler. Such addition should be accompanied by continuous stirring of such constituents. in the liquid vehicle to obtain a uniform dispersion thereof.
  • organic dyestuff color precursor materials are stable in alkaline media and, within the above formulation ranges, such coating composition can be used to coat most all paper substrates without any effect on the reaction time or the density of the image produced when using the CB sheet coatings described above.
  • the following formulation has provided a satisfactory CF sheet coating.
  • Each of the foregoing CF coating formulations results in a CF coating layer of neutral or alkaline character, of acceptable appearance and having the color precursor chromogenic reagent homogeneously distributed there throughout.
  • Such coatings are singularly abrasion and odor free and have been formed of coating weights as low as .2 grams/square meter.
  • the image forming reaction proceeds without the color precursor chromogenic reagent material in the CF coating being solubilized and ionized the liquid electron accepting chromogenic reagent material emitted from the CB coating.

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EP82302223A 1982-04-29 1982-04-29 Papier de copiage chimique amelioré sans carbone et milieu de transfert Withdrawn EP0093208A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2581350A1 (fr) * 1985-05-02 1986-11-07 Wiggins Teape Group Ltd Matiere d'enregistrement portant une composition revelatrice ou developpatrice de couleur

Citations (8)

* Cited by examiner, † Cited by third party
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DE1934367A1 (de) * 1968-07-09 1970-02-19 Fuji Photo Film Co Ltd Verfahren zur Herstellung eines Farbblattes
DE2426678A1 (de) * 1973-07-27 1975-02-06 Kores Holding Zug Ag Druckempfindliches durchschreibematerial
DE2556083A1 (de) * 1975-02-25 1976-09-02 Kores Holding Zug Ag Druckempfindliches aufzeichnungsmaterial
DE2613068A1 (de) * 1975-06-06 1976-12-23 Kores Holding Zug Ag Uebertragungsmaterial
DE2731418A1 (de) * 1977-07-12 1979-01-18 Feldmuehle Ag Farbreaktives aufzeichnungsmaterial und verfahren zu seiner herstellung
EP0016730A2 (fr) * 1979-03-20 1980-10-01 Ciba-Geigy Ag Composition de developpement pour la fabrication d'un matériau sensible à la pression pour inscription; feuille couverte de ce matériau; matériau sensible à la pression pour inscription et procédé pour sa fabrication
GB2055923A (en) * 1979-08-06 1981-03-11 Kores Holding Zug Ag Colour-reactive recording sheets

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US3163548A (en) * 1961-05-22 1964-12-29 Petrolite Corp Carbon paper ink containing an isocyanate modified, amine treated, oxidized non-benzenoid hydrocarbon wax
DE1934367A1 (de) * 1968-07-09 1970-02-19 Fuji Photo Film Co Ltd Verfahren zur Herstellung eines Farbblattes
DE2426678A1 (de) * 1973-07-27 1975-02-06 Kores Holding Zug Ag Druckempfindliches durchschreibematerial
DE2556083A1 (de) * 1975-02-25 1976-09-02 Kores Holding Zug Ag Druckempfindliches aufzeichnungsmaterial
DE2613068A1 (de) * 1975-06-06 1976-12-23 Kores Holding Zug Ag Uebertragungsmaterial
DE2731418A1 (de) * 1977-07-12 1979-01-18 Feldmuehle Ag Farbreaktives aufzeichnungsmaterial und verfahren zu seiner herstellung
EP0016730A2 (fr) * 1979-03-20 1980-10-01 Ciba-Geigy Ag Composition de developpement pour la fabrication d'un matériau sensible à la pression pour inscription; feuille couverte de ce matériau; matériau sensible à la pression pour inscription et procédé pour sa fabrication
GB2055923A (en) * 1979-08-06 1981-03-11 Kores Holding Zug Ag Colour-reactive recording sheets

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2581350A1 (fr) * 1985-05-02 1986-11-07 Wiggins Teape Group Ltd Matiere d'enregistrement portant une composition revelatrice ou developpatrice de couleur
US4851384A (en) * 1985-05-02 1989-07-25 The Wiggins Teape Group Limited Record material

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