JPH01278386A - Production of color transfer sheet - Google Patents

Abstract

PURPOSE:To eliminate the occurrence of missing or weakening of image, by a method wherein a color transfer sheet is produced by removing a colorant dispersing resin layer in a non-printing area of a transfer sheet substrate holding a toner image using an organic solvent. CONSTITUTION:By a copying machine loaded with a developing device incorporating a white toner or a transparent toner, a mirror of an original image is formed with the white toner or the transparent toner on a color transfer sheet substrate. Here, the mirror image is formed with the white toner using an original of a reversed OHP sheet having a non-reverse image of the original image, for example, with a black toner. A colorant dispersing resin layer 23 having no applied toner image 40 on the obtained transfer sheet substrate provided with the mirror image with the white toner or the transparent toner is removed by washing etc. to obtain a color transfer sheet. Then, an adhesive 42 is applied to the obtained toner image 40 having the colorant dispersing resin layer 23 as a lower layer, and the surface of the adhesive 24 is brought into close contact with a transfer material 30 and rubbed from on a heat- resistant resin film; in this manner, a color image is formed on the transfer material 30.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for producing a color transfer sheet using a toner image obtained by electrophotography, and more specifically, the present invention relates to a method for producing a color transfer sheet using a toner image obtained by electrophotography, and more specifically, the present invention relates to a method for producing a color transfer sheet using a toner image obtained by electrophotography or the like. This article relates to a method for producing a color transfer sheet with a bright color.

(Prior Art) A copying method using electrophotography generally involves forming an electrical latent image corresponding to the original image on a photoreceptor using a photoconductive substance, and developing the latent image with black toner. The developed toner image is then transferred onto a transfer material and fixed by heating or pressure to obtain a copy. In recent years, a method for obtaining a color transfer sheet for transferring the obtained monochrome copy image to another transfer material as a colored image has been developed and put into practical use. Hereinafter, the method for making the same will be explained with reference to the drawings. As shown in FIG. A copy 1 having a toner image 13 is obtained. and,
The toner image 13 of the copy is transferred to the colorant-dispersed resin layer 2 of the color transfer sheet base material 2, in which a wax layer 22 and a colorant-dispersed resin layer 23 are sequentially formed on a heat-resistant resin film 21.
3 facing each other and heated by a heating means such as a pressure heat roller, the silicone oil baking layer 11 is dissolved as shown in FIG. 23 is welded to the toner image 13, and the toner image 13 is separated from the heat-resistant resin sheet 12.

In this way, the toner image is transferred to the transfer sheet base material 2.

Next, the colorant-dispersed resin layer of the transfer sheet substrate 2 carrying the obtained toner image 13 to which the toner image is not attached is wiped off with a solvent that does not dissolve the toner image, and the adhesive 24 is applied to the toner image 13. The color transfer sheet shown in Figure (C) is completed. Furthermore, to explain the color image forming method using a color transfer sheet, the third
As shown in the figure, by bringing the adhesive layer 24 of the color transfer sheet into close contact with the transfer material 30 and rubbing it over the heat-resistant resin film 21, a releasing effect is created between the wax N22 and the heat-resistant resin film 21. , a color image 5 having a colorant-dispersed resin layer 23 covering the surface of the toner image 13 is formed on the transfer material 30 .

(Problems to be Solved by the Invention) However, in the color transfer sheet created by the conventional method described above, silicone oil baking causes the toner image formed on the layer to be transferred to the color transfer sheet base material. When the mold release effect is insufficient, the result shown in Fig. 4 (a)
), the image is transferred to the transfer sheet substrate with part of it missing, and the color image formed on the transfer sheet thus obtained is as shown in FIG. 4(b). Parts of the image may be missing or the image may become thinner, resulting in a defective image.

Furthermore, the color images obtained by the color transfer sheet created by the conventional method described above are shown in FIGS. 3 and 4.
As can be seen from the figure, the colorant-dispersed resin layer (chromatic component) on the surface is grounded by a black toner layer, which impairs the clarity of the chromatic colors and results in a dull color (chromatic) image. Put it away. In particular, if the colorant-dispersed resin layer is a light color such as yellow, it will be more affected by the base, resulting in a dark image.

Therefore, an object of the present invention is to solve the above-mentioned problems and provide a method for producing a color transfer sheet that allows image formation without impairing the vividness of colors (chromatic colors) and without causing image chipping or image thinning. It is about providing.

(Means and actions for solving the problem) A white or transparent toner is applied to a document image on a transfer sheet base material in which a colorant-dispersed resin layer is formed on a heat-resistant resin sheet via a wax layer. The object of the present invention is achieved by forming a mirror image and then removing the colorant-dispersed resin layer in the non-image area of the transfer sheet base material carrying the obtained toner image with an organic solvent to create a color transfer sheet. achieved.

(Function) To obtain the color transfer sheet of the present invention, first, a mirror image of the original image is created on the base material for the color transfer sheet using a copying machine equipped with a developing device containing white toner or transparent toner. Formed with transparent toner. Here, the mirror image is formed by, for example, turning over an OHP sheet on which a normal image of the original image is formed using black toner to form an original image, and forming an image using white toner. In particular, if a copying machine with an optical system that can change the number of reflective mirrors is used, it can be preferably used because a mirror image can be easily obtained.6 Next, a transfer sheet on which a mirror image is formed with the obtained white toner or transparent toner A color transfer sheet is obtained by performing a removal operation such as washing off the colorant-dispersed resin layer of the substrate to which the toner image is not attached with an organic solvent. Then, an adhesive is applied to the resulting toner image having a colorant-dispersed resin layer as the lower layer, the adhesive surface is brought into close contact with the transfer material, and the heat-resistant resin film is rubbed onto the transfer material. A color image is formed.

FIG. 1 is a schematic cross-sectional view of a color image formed using a color transfer sheet obtained by the method of the present invention.

In this way, since the white toner image surface 40 is coated with the chromatic colorant-dispersed resin layer 23, the formed color (chromatic color) image is not affected by the hue of the underlying toner layer, and can be as desired. Color images can be obtained without loss of vividness. Furthermore, since a toner image is formed on the substrate for a direct transfer sheet, a clear image can be formed without causing image chipping or image thinning due to toner image migration, which are the aforementioned conventional problems.

The present invention will be explained in detail below.

The white toner used in the present invention includes a binder resin, a white colorant, and other additives such as a charge control agent and a release agent, and the composition is not particularly limited as long as it does not adversely affect the color tone of the toner. It's not something you can do. The weight ratio of the white colorant to the binder resin is preferably from 2:100 to 50:100.

As the binder resin used in this toner, various resin materials conventionally known as toner binder resins for electrophotography are used. For example, polystyrene, polystyrene
Styrenic copolymers such as butadiene copolymers, styrene/acrylic copolymers, polyethylene, ethylene copolymers such as polyethylene/vinyl hydrochloride copolymers, polyethylene/vinyl alcohol copolymers, phenolic resins, epoxy resins, allyl phthalate resins, polyamide resins, polyester resins, maleic acid resins, etc.

The white coloring agents used in this toner include zinc white,
Examples include titanium oxide, tin oxide, antimony white, zinc sulfide, zinc oxide, barium carbonate, clay, silica, white carbon, talc, alumina, pallite, and the like.

As the charge control agent used in this toner, a known colorless or white one is used as it does not adversely affect the color tone of the white toner. For the purpose of positive charge control, organic compounds having a basic nitrogen atom, such as basic dyes, aminopyrine, pyrimidine compounds, polynuclear polyamine compounds, aminosilanes, or fillers surface-treated with these, are used. Further, for the purpose of controlling negative charge, a carboxyl group-containing compound such as a metal chelate of alkyl salicylic acid is used. These charge control agents are preferably used in an amount of 1 to 10% by weight per toner.

Further, examples of the release agent used in this toner include silicone oil, low molecular weight olefin resins, and various waxes.

The white toner is obtained by melting and kneading the above components, cooling them, and then crushing and classifying them. It can also be obtained by dispersing toner ingredients in a resin solution and then spray granulating the resultant.

Further, a transparent toner can be produced by removing the white colorant component from the above-described white toner composition.

These white toner and transparent toner can be suitably selected and used depending on the color tone of the transfer material, but it is preferable to use the transparent toner when the transfer material is white or close to white. If the transfer material is colored, the white toner is preferably used with increased hiding power depending on the refractive index of the binder resin and the particle size and content of the white colorant.

The base material for the transfer sheet used in the present invention is polyethylene terephthalate (polyethylene terephthalate (
Hereinafter, it will be referred to as PET. ) is preferable, and the thickness is preferably 40 μm to 12 μm.
Those rolled to 0 μm, especially 50 to 100 μm are used.

In addition, various waxes are used as the release layer, including animal waxes such as beeswax, Serratus wax, beef tallow, vegetable waxes such as carnauba wax, petroleum waxes such as paraffin wax and microcrystalline wax, polyethylene wax, and other synthetic waxes. Waxes, such as polyhydric alcohol esters of higher fatty acids, higher ketones, higher amines, higher amides, condensates of higher fatty acids and amines, synthetic paraffins, chlorinated paraffins, silicone oils, etc.
It is formed to have a thickness of 2 μm to 0.3 μm.

Furthermore, as the resin used for the colorant-dispersed resin layer, it is preferable to use a resin that is compatible with the binder resin of the white toner (transparent toner) and is soluble in alcohol in consideration of removal work using a solvent. In addition to alcohol-soluble binder resins for toners, known alcohol-soluble resins such as polyvinyl alcohol, polyvinyl pulcohol, polyvinyl butyral, polyvinylpyrrolidone, and polyacrylic acid are used. Examples of colorants to be dispersed in these resins include the following.

Blue pigments: cobalt blue, cerulean blue, alkali blue lake, peacock blue lake, Victoria blue lake, metal-free phthalocyanine blue, phthalocyanine blue, fast sky blue, indanthrenblue-1 (R3, BC), indigo purple pigment Cobalt purple, manganese purple, Faust violet B, methyl violet lake green pigments...Chrome green, zinc green, chromium oxide, viridian, emerald green, pigment green B1 naphthol green B, green gold, acid green lake, malachite Green Lake, Phthalocyanine Green Red Pigment...Red Garla, Red Lead, Silver Vermilion, Cadmium Red, Cadmium Mercury Red, Antimony Vermilion, Permanent Red 4R, Rose Red\Physe Red, Parachlororthonitroaniline Red, Lysol Fast Scarlet G , brilliant fast scarlet, vermilion, brilliant carmine BS, permanent red (F 2RSF 4R, FRL, FRLL,
F4RH), Fast Scarlet VD, Belkan Fast Rupine B1 Resole Red, Rake Red (C, D
), Anthocyan B1 Brilliant Scarlet G5 Lysol Rubin GK, Permanente F5R, Brilliant Carmine 6B, Pigmented Scarlet 3B, Bordeaux 5B, Toluidine Maroon, Permanent Bordeaux F 2K.

Helio Bordeaux BL, Bordeaux 10B1 Bon Maroon Light, Bon Maroon Medium, Eosin Lake, Rhodamine Lake B10-Damin Lake Y.

Alizarin Lake, Thioindigo Red B1 Thioindigo Maroon Yellow Pigment...Naphthol Yellow 31 Hansa Yellow (1
0G, 5G, G), cadmium yellow, yellow iron oxide, loess, ferruginous yellow, lead cyanamide, calcium leadate, Hansa yellow (GRSA, RN, , R), pigment yellow, benzine yellow (G, GR), permanent yellow (NCG) L Parcan Fast Yellow (5G, R), Tartrazine Lake, Quinoline Yellow Lake, Anthrazan Yellow GL or C,1,5olvent Yellow+
60, C, 1,5olvent Red 271. C
, 1,5olvent Blue 35 and various other oil-soluble dyes. These colorants are used singly or in a mixture of two or more depending on the color tone of the desired image, and are used in an amount that provides sufficient image density, for example, 1 to 50
It is used by dispersing it in a resin in an amount of 2 to 30% by weight, preferably 2 to 30% by weight.

Then, the mixture of resin and colorant mentioned above is dissolved in a solvent, and silicone oil is applied using an air knife coater, a roll coater, a bar coater, a blade coater, a slide hopper coater, a gravure coater, or a combination thereof, followed by linear tunnel drying. Baking and drying is performed using various drying devices such as a hot air dryer such as a dryer, an arch dryer, an air loop dryer, a sine curve air float dryer, a dryer using infrared rays, a heated dryer, a microwave, etc. 40μ
A base material for a color transfer sheet is formed by coating and drying to a thickness of about 10 μm to 30 μm, preferably about 10 μm to 30 μm. The colorant-dispersed resin layer is molded to have a softening point of 100 to 150° C., a volume resistivity of 10 9 to 10 I3 Ω·cm, and a surface resistivity of 10 9 to IQ 13 Ω.

In addition, various types of adhesives to be used after creating the color transfer sheet include acrylic ester copolymer, vinyl acetate/acrylic copolymer, acrylic synthetic rubber, natural rubber latex, vinyl acetate resin aqueous emulsion, acrylic ester aqueous emulsion, etc. Glue is used.

Examples are shown below.

(Example) Apply silicone oil to a thickness of 0.05 μm using an air knife coater on a 50 μm PET film made of Car Sea.
It was dried at 0°C for 1 hour. Next, from above the silicone oil layer, a polyvinyl butyral resin with a melting point of 160°C and an 80% resin solution prepared by dissolving 30 parts by weight of cobalt blue per 100 parts by weight of the resin in methanol was applied using a roll coater to form a 20 μm layer. It was applied evenly in thickness. and,
This was dried at 120°C for 3 hours to create a blue color transfer sheet. The surface resistance of this transfer sheet is 8゜5X10'Ω, and the volume resistivity is 4.6X10'Ω・cm.
Styrene-acrylic copolymer 100 parts by weight Titanium oxide pigment: CR-EL (manufactured by Ishihara Sangyo Co., Ltd.) 10 parts by weight Charge control agent: Bontron E-80 (Orient Chemical Co., Ltd.) 1 part by weight Low molecular weight 11t polypropylene: Viscol 550P (manufactured by Sanyo Chemical Co., Ltd.) 1.5 parts by weight A mixture consisting of the above formulation was melt-kneaded, cooled, pulverized and classified to obtain a white toner.

The respective developing devices containing the white toner and ordinary black toner obtained above were installed in an electrophotographic copying machine DC-2055 (
(manufactured by Sanda Kogyo Co., Ltd.), and first, a normal image of the original image was formed on an OHP sheet using black toner. Then, this OHP sheet was turned over to serve as a document, and a mirror image of a white toner image was formed on the color transfer sheet obtained above.

Next, areas other than the toner image are wiped off with alcohol, and the adhesive side made of vinyl acetate aqueous emulsion is applied to the toner image of the obtained transfer sheet, and the adhesive layer is brought into close contact with high-quality paper and rubbed over the PET sheet. As a result, a clear blue color image with no image defects was obtained.

(Effects of the Invention) According to the present invention, by forming a mirror image of the original image on the base material for a color transfer sheet using white toner,
A color transfer sheet capable of forming a clear color image without image chipping or image thinning can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a color image formed using a color transfer sheet obtained by the method of the present invention. FIG. 2 is a schematic cross-sectional view showing the process of creating a color transfer sheet using a conventional method. FIG. 3 is a schematic cross-sectional view of a color image formed using a color transfer sheet according to a conventional method. FIG. 4 is a schematic cross-sectional view showing image chipping that occurs during the process of creating a color transfer sheet using a conventional method. 40...White toner image 13...Black toner image 11...Silicone oil baking is layer 30...Transfer material

Claims (1)

[Claims] A mirror image of the original image is formed using white or transparent toner on a transfer sheet base material in which a colorant-dispersed resin layer is formed on a heat-resistant resin sheet via a wax layer, and the resulting toner image is carried. A method for producing a color transfer sheet, which comprises removing a colorant-dispersed resin layer in a non-image area of a base material for a transfer sheet using an organic solvent.