CA2083917A1 - Ink release sheet - Google Patents

Ink release sheet

Info

Publication number
CA2083917A1
CA2083917A1 CA 2083917 CA2083917A CA2083917A1 CA 2083917 A1 CA2083917 A1 CA 2083917A1 CA 2083917 CA2083917 CA 2083917 CA 2083917 A CA2083917 A CA 2083917A CA 2083917 A1 CA2083917 A1 CA 2083917A1
Authority
CA
Canada
Prior art keywords
ink
ink transfer
wax
transfer carrying
carrying surface
Prior art date
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.)
Abandoned
Application number
CA 2083917
Other languages
French (fr)
Inventor
Kevin Anthony Kirk
Conway Francis Shields
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ExxonMobil Oil Corp
Original Assignee
Mobil Oil Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mobil Oil Corp filed Critical Mobil Oil Corp
Publication of CA2083917A1 publication Critical patent/CA2083917A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/10Duplicating or marking methods; Sheet materials for use therein by using carbon paper or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J31/00Ink ribbons; Renovating or testing ink ribbons

Landscapes

  • Printing Methods (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

F-6491-L(PAC) ABSTRACT
Ink Release Sheet Improved transfer of ink from a reservoir to an ink receptive surface is accomplished by using as the ink transfer surface, which passes the ink from the reservoir to the ink receptive surface, a combination of an synthetic organic resin and wax.

Description

2 ~
F--6491--L(PAC) INR F~SE SE~EEr m is invention is relat~ to an ink release sheet. More particularly, the invention is directed to sheets of material which serve as an intermediary to transfer ink from an ink reservoir to an ink-receptive surface.

Ink transfer matPrials are well known. Perhaps the most commonly known such material is a typewriter ribbon. In the use of a typewriter ribbon, the ink is suitably applied to the ribbon; the ribbon is ~uxtaposed with an ink receptive surfa oe, with the ink side facing the ink receptive surfa oe; a suitable indicia formm g means is impacted on the other side of the rib~on to force ink frcm the ribbon into intimate contact with the ink receptive surfa oe, in the shape of the indicia form mg means; and the ink receptive surfa oe thus beoomes imprinted with the ink indicia.

In another type of ink transfer, indicia forming means, such as printing type, are directly coated with ink and then impressed onto the surface of ink receptive means, such as for example paper or plastic film. m e ink transfers from the indicia to the ink reoeptive means thereby formung the indi~ia on the ink re oeptive surfaoe. m e indicia forming me~ns in this sort of operation has suitably been metal or, more reoently, very tough plastic. In this operation, there is no intermediate ink transfer sheet. The ink coats the type, and then, upon contact, is transferre~ from the type directly to the paper. In this application, the ink is not usually absorked by the type to any appreciable extent.

It is axiomatic that the quality of the indicia imprinted on the ink receptive surfa oe is a function of many things, including power with which the ink transfer surfa oe holds the ink prior to transfer, and the ease and completeness with which the ink is transferred from the ink transfer means to the ink receptive surfa oe. The clarity with which the transferred ink corresponds to the indicia forming means is a function of all of these things.

2~91'~

F-6491-L(PAC) m e ink must ke held onto the surface of the ink transfer means with enough force so that enough of it is carried to make the desired image, and so that it does not readily smudge. At the same time, it must not ke held to the surface with so much force that it will not ke easily and exactly transferable to the ink receptive surface upon its being juxtaposed to the ink receptive surface. The composition and the physical properties of both the ink and of the surface of the ink transfer means must be taken into account in arriving at a suita~ble combination of materials which have the desirable properties which are needed for this service.

It has been krKwn to use various materials as the ink transfer means.
In the early application of this technology, where there is an intermediate ink transfer sheet, such as a typewriter ribbon or the like, paper was used as the intermediate ink transfer sheet. As time has passed, newer materials have been developed for this servioe, including plastic films. Almost any material which can hold a given ink sufficiently tightly to keep it on the surface of the intermediate ink transfer sheet means, but will not hold it so tightly that it does not readily release on demand, is suitable for this service.
Specifically, polyethylene, regenerated cellulose, cellulose acetate, polypropylene, particularly biaxially oriented polypropylene and polyester films, have been used as intermediate ink transfer sheet means.

Although plastic and paper films have been used as intermediate ink transfer sheets in the past, it is probably more accurate to consider these materials as being substrates which carry the ink in a condition which is temporarily adhered to the surface. Therefore, it is not only a question of the nature of the material which acts as the carrier of the ink, but it is also a question of the nature of the surface of the material which acts as the carrier of the ink. The carrier itself can be chosen for its mechanical strength, heat stability, and flexibility properties, and for the economies of use.
The surface of this carrier can then be modified in order to give the required ink adhesion related properties.

2~39l7 F-6491-L(PAC) In the past the only surface preparations which were used was to corona discharge treat or flame treat the surface. The surfaoes thus produced were not consistent.

The adhesive and release characteristics of the inks used have, on occasion, been modified to improve one property at tlle expense of other properties. Multiple inks could have been used for the same purpose, but this requires the use of specialised equipment at additional cost.

While it is quite well known what sort of properties are desired for the surface of the ink transfer means, providing materials with these properties has not been easy. There does not seem to be any known simple relationship between the desired properties of the ink transfer material surfa oe and the quality of the printed ink indicia. At best, there is the qualitative relationship that it is known that the ink must stick to the ink transfer surfa oe a little bit, but not too much.
It appears that this is an empirical relationship.

According to one aspect of the invention, there is provided a process of transferring ink from a reservoir of ink to an ink receptive surface comprising disposing ink on an ink transfer carrying surface, juxtaposing said ink on said ink transfer carrying surface to said ink receptive surface, and transferring said ink from said ink transfer carrying surface to said ink receptive surface, wherein the said ink transfer carrying surface is a composition comprising substantially O
to 75 weight percent of at least one synthetic resin and substantially 25 to 100 weight percent of at least one wax.

Ascording to another aspect of the invention there is provided an ink transfer carrying surface comprising a composition comprising substantially O to 75 weight percent of at least one synthetic resin and substantially 25 to 100 weight percent of at least one wax.

y ~ l F-6491-L(PAC) Preferably the synthetic resin is at least one member selected from the group consisting of acrylic resins, surlyn resins, ethylene/acrylic acid reins and polyvinylidene chloride resins.

Preferably the wax is at least one member selected from the group consisting of carnauba wax, paraffin wax, polyethylene wax, and microcrystalline wax.

Desirably the composition comprises substantially 5 to 30 weight percent synthetic resin and substantially 70 to 95 weight percent wax.

Okher components may be used in the composition of this invention.
For example, silica, silica gel, talc or the like can also be incorporated in this composition. Where these slip agents are used, they should not be present in a proportion of greater than about 1.5, preferably not greater than about 0.1, weight percent, ka~ed on the amount of total solids in the coating~

m e coating is suitably present on the surface of said ink transfer carrying surface in a proportion of substantially 0.02 to 2 g/1000 square inches (0.02 to 2 g/6450cm~) of surface; and preferably substantially 0.035 to 1.5 g/1000 square inches (0.035 to 1.5 g/6450cm ) of surface.

The coating is suitably present on the surface of said ink transfer carrying surface in such proportions that the wax content thereof is substantially 0.02 to 0.15 g/1000 square inches (0.02 to 0.15 g/6450cm ) of surface; and preferably substantially 0.04 to 0.1 g/1000 square inches (0.04 to 0.1 g/6450cm2) of surface.

Typically, the ink carrying transfer surface would be flexible, as would the coating.

Inks can be solvent or water based using polyamide, nitro- cellulose, polyester, acrylic, styrene, or other resins common to the art. The 2.~3~ 7 F-6491-L(PAC) pigments are conventional and will be well kncwn to those of routine skill in the ink art.

In a preferred embodiment the coating composition comprises 10 parts by weight of a combination of methyl acrylate, methyl methacrylate and methacrylic acid; and 90 parts by weight of carnauba wax.

Where the ink is to be transferred onto an ink receptive means thrcugh an intermediate ink transfer intermediate sheet, such as a ribbon, the improved ink transfer surface composition of this invention is suitably disposed on the surface of the intermediate ink transfer sheet on which the ink will be dispcsed. m erefore, in this embodiment, the ink will be carried directly by the instant invented composition.

Where the ink is to be transferred onto an ink receptive means directly from indicia imparting means, such as type, the improved ink transfer surface ccmposition of this invention is suitably disposed directly on the surface of the indicia imparting means. merefore, in this embodiment, while the underlying support structure is different, the ink is also carried directly by the instant invented composition.

m is invention will have application in other transfer processes such as transfer metallization, and printing on fibre glass panels. This invention will also have application in other processes requiring consistent adjustable release of ink.

me synthetic polymer portion of this composition provides the means to adhere the composition to the substrate. It also provides at least scme of the surface which actually supports the ink. merefore, the resin should be one which adheres well to the sukstrate surface on which the composition is disposed and yet does not have great adherence to the ink. m e synthetic polymers which are well suited to use in the composition of this invention are described above; a cambination of these synthetic polymers may be used. One particular ~839~7 F-6491-L(PAC) type of synthetic organic polymer is defined as acrylic resins having a glass transition temperature between about 30 and 100 C.

m e wax portion of the ccmposition of this invention provides the means to release the ink fram the ink transfer surface to the ink receptive surfa oe. Substantially any wax, which is solid at the temperatures at which the print mg will be accomplished, will be suited to use in this invention. Examples of such wax are given above;
a ccmbination of these waxes may be used.

Where there is an intermediate ink transfer sheet which is being used in this invention, the instant composition is applied to the surface of the sheet before the ink is applied thereto. Where this intermediate ink transfer film form sheet material is oriented, the ccmposition of this invention can be applied before or after the orientation stretching of the film. It is preferred, however, that where the substrate film is biaxially oriented, the oamposition of this invention is applied to the surface of the substrate film between the machine direction and the transverse direction orientation operations.

It has been found that the composition of this invention can be put up in any desired manner, such as a solution or an emulsion in a suitable liquid carrier, and the solution or emulsion can then be used in a conventional manner to coat a suitable su~strate. Dipping is one of the conventional coating means, as is the use of a doctor blade.
Other suitable means would include reverse direct gravure, offset gravure, direct gravure, meyer rod, and slot die. Upon the fluid form coating having been applied, the carrier is suitably removed, by evaporation or otherwise, leaving the composition of this invention suitably disposed on the surface of the substrate.

It is desired that the camposition of this invention be adapted to being dissolved or dispersed in a suitable carrier fluid, such as for example water or an organic solvent. Where needed or desired, suitable surfactants, and/or other ingredients, can be incorporated in 2~8~ 7 F-6491-L(PAC) the composition of this invention in conventional proportions for their intended purpcses.

E~LE
A coating composition, made up of 90 parts by weight of carnauba wax and 10 parts by weight of an acrylic polymer campositi~n containing:
54 % methyl methacrylate, 42% methyl acrylate, and 4 % methacrylic acid, was dispersed in water to make a 3~ solids coating camposition.
A polyethylene terephthalate polyester sheet was machine direction stretched to three (3) times its original length in order to MD orient the sheet. m e coating camposition was applied to one surface of the MD stretched sheet via a 45 quad reveræ direct gravure in line coater. Then the coated film was stretched in the transverse direction sufficient to increase the width thereof by four (4) times.
The finished ink transfer sheet was about 50 gauge and the finished coat mg weight was up to about 0.1 gms/1000 in2.

Ink was applied uniformly to the coated surface of the polyester sheet, and the inked sheet was used in impact printing of a plastic film surface. The quality of the printing was excellent.

Claims (24)

1. A process of transferring ink from a reservoir of ink to an ink receptive surface comprising disposing ink on an ink transfer carrying surface, juxtaposing said ink on said ink transfer carrying surface to said ink receptive surface, and transferring said ink from said ink transfer carrying surface to said ink receptive surface, wherein the said ink transfer carrying surface is a composition comprising substantially 0 to 75 weight percent of at least one synthetic resin and substantially 25 to 100 weight percent of at least one wax.
2. A process according to 1, wherein said synthetic resin is at least one member selected from the group consisting of acrylic resins, surlyn resins, ethylene/acrylic acid reins and polyvinylidene chloride resins.
3. A process according to claim 1, wherein said wax is at least one member selected from the group consisting of carnauba wax, paraffin wax, polyethylene wax, and microcrystalline wax.
4. A process according to claim 1, wherein said composition comprises substantially 5 to 30 weight percent synthetic resin and substantially 70 to 95 weight percent wax.
5. A process according to claim 1, which further includes not more than substantially 1.5 weight percent of at least one member selected from the group consisting of silica, silica gel and talc.
6. A process according to claim 1, wherein said coating is present on the surface of said ink transfer carrying surface in a proportion of substantially 0.02 to 2 g/1000 square inches of surface.
7. A process according to claim 1, wherein said coating is present on the surface of said ink transfer carrying surface in a proportion of substantially 0.035 to 1.5 gram/1000 square inches of surface.

F-6491-L(PAC)
8. A process according to claim 1, wherein said coating is present on the surface of said ink transfer carrying surface in such proportions that the wax content thereof is substantially 0.02 to 0.15 gram/100 square inches of surface.
9. A process according to claim 1, wherein said coating is present on the surface of said ink transfer carrying surface in such proportions that the wax content thereof is about 0.04 to 0.1 gram/1000 square inches of surface.
10. A process according to claim 1, wherein said ink is solvent based.
11. A process according to claim 1, wherein said ink is water based.
12. A process according to claim 1, wherein said coating composition comprises 10 parts by weight of a combination of methyl acrylate, methyl methacrylate and methacrylic acid; and 90 parts by weight of carnauba wax.
13. An ink transfer carrying surface comprising a composition comprising substantially 0 to 75 weight percent of at least one synthetic resin and substantially 25 to 100 weight percent of at least one wax.
14. An ink transfer carrying surface according to claim 13, wherein said synthetic resin is at least one member selected from the group consisting of acrylic resins, surlyn resins, ethylene/acrylic acid reins and polyvinylidene chloride resins.
15. An ink transfer carrying surface according to claim 13, wherein said wax is at least one member selected from the group consisting of carnauba wax, paraffin wax, polyethylene wax, and microcrystalline wax.

F-6491-L(PAC)
16. An ink transfer carrying surface according to claim 13, wherein said composition comprises substantially 5 to 30 weight percent synthetic resin and substantially 70 to 95 weight percent wax.
17. An ink transfer carrying surface according to claim 13, which further includes not more than substantially 1.5 weight percent of at least one member selected from the group consisting of silica, silica gel and talc.
18. An ink transfer carrying surface according to claim 13, wherein said coating is present on the surface of said ink transfer carrying surface in a proportion of substantially 0.02 to 2 g/1000 square inches of surface.
19. An ink transfer carrying surface according to claim 13, wherein said coating is present on the surface of said ink transfer carrying surface in a proportion of substantially 0.035 to 1.5 g/1000 square inches of surface.
20. An ink transfer carrying surface according to claim 13, wherein said coating is present on the surface of said ink transfer carrying surface in such proportions that the wax content thereof is substantially 0.02 to 0.15 g/1000 square inches.
21. An ink transfer carrying surface according to claim 13, wherein said coating is present on the surface of said ink transfer carrying surface in such proportions that the wax content thereof is substantially 0.04 to 0.1 g/1000 square inches of surface.
22. An ink transfer carrying surface according to claim 13, wherein said ink is solvent based.
23. An ink transfer carrying surface according to claim 13, wherein said ink is water based.

F-6491-L(PAC)
24. An ink transfer carrying surface according to claims 13, wherein said coating composition comprises 10 parts by weight of a combination of methyl acrylate, methyl methacrylate and methacrylic acid; and 90 parts by weight of carnauba wax.
CA 2083917 1991-12-10 1992-11-26 Ink release sheet Abandoned CA2083917A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80541191A 1991-12-10 1991-12-10
US805,411 1991-12-10

Publications (1)

Publication Number Publication Date
CA2083917A1 true CA2083917A1 (en) 1993-06-11

Family

ID=25191505

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2083917 Abandoned CA2083917A1 (en) 1991-12-10 1992-11-26 Ink release sheet

Country Status (2)

Country Link
EP (1) EP0546708A1 (en)
CA (1) CA2083917A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA712232B (en) * 1970-04-13 1972-01-26 A Cuneo Self-regenerative carbographic articles comprising a layer interposed between the support and the inkreleasing coating
US3786013A (en) * 1972-04-19 1974-01-15 Ncr Transfer media and transferable coating compositions

Also Published As

Publication number Publication date
EP0546708A1 (en) 1993-06-16

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