JPS60255489A - Thermal transfer member for correction - Google Patents

Abstract

PURPOSE:To provide the titled member which enables the correction of an image misrecorded simply and accurately by providing a hot melting ink transfer layer that contains a coloring agent or the like with a specified refractive index the same in the base as color of a plain paper while showing a higher melt viscosity than a transfer layer of a transfer sheet on a support. CONSTITUTION:A hot melting ink transfer layer which contains a coloring agent (e.g. white lead) with the refractive index of more than 1.8 the same in the base as color of a plain paper and a filling agent (e.g. silver) with the reflectance of more than 60% as required while showing a higher melt viscosity than a transfer layer of a transfer sheet is applied on a support (e.g. paper) by an ordinary method to obtain the desired thermal transfer member for correction. When a recording is done using the transfer sheet, it is put on a plain paper in such a manner that the transfer layer thereof touches the surface thereof and then, a thermal printing is performed from the back of the transfer sheet to record a transfer ink image.

Description

Detailed Description of the Invention [Technical Field] The present invention provides a method for easily removing recorded images erroneously recorded on plain paper when thermal transfer is performed using a transfer sheet having a heat-melting ink transfer layer and plain paper. The present invention also relates to a correction thermal transfer member that is applied to reliably correct images and record correct images.

[Prior art]

2. Description of the Related Art Conventionally, a thermal transfer method is known in which a transfer sheet having a heat-fusible ink transfer layer is placed on plain paper and thermal transfer is performed to form an ink image on the plain paper. When such thermal transfer is performed, erroneous recording often occurs, and it is necessary to correct the recording. Correcting erroneous records is usually done by scratching off the erroneous records with a sand eraser or applying white paint over the erroneous records, but these methods are difficult to correct. At the same time, there were also drawbacks such as the areas after correction becoming dirty, and the results were not satisfactory.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide a correction member for correcting erroneous recording when recording is performed using a transfer sheet and plain paper as described above.

〔composition〕

According to the present invention, when thermal transfer is performed using a transfer sheet 1- having a heat-melting ink transfer layer and plain paper, the member is applied to correct erroneous recordings formed on the plain paper. and contains a colorant with a refractive index of 1.8 or more similar to the color of the plain paper, and optionally a filler with a reflectance of 60% or more, and a melt viscosity higher than that of the transfer layer of the transfer sheet. A heat-sensitive transfer member for correction is provided, characterized in that a heat-melt ink transfer layer exhibiting the following is provided on a support.

In the thermal transfer member for correction of the present invention, a colorant having a refractive index of 1.8 or more is used as a colorant for correction. In this case, the main purpose of the coloring agent is to coat the erroneous records formed on the plain paper with a colorant that has the same color as the surface of the plain paper, making the erroneous records virtually unreadable, and at the same time, the corrected areas can be easily The purpose is to make it less noticeable from the surface of the paper.

The coloring agent used in the present invention includes complexions such as white, red, yellow, and green, and mixtures thereof, and typical examples thereof are shown in Table 1.

Table 1 - JIJ pull - fart death Ikuhi [Rainbow lead white 1,98 Zinc flower 2.06 Antimony oxide 2.20 Zinc sulfide 2.40 Titanium oxide 2.70 Ritopon 1.84 Antimony dioxide 2.09 Cadmium red 2.6 Cadmium orange 2.3 Barium yellow 1.9 Strontium yellow 1.9 Cobalt green 1.9 In the present invention, a coloring agent with a refractive index of 1.8 or more is used. The agent has strong hiding power and is effective when used in small amounts. Colorants with a refractive index lower than 1.8 have weak hiding power, so they are ineffective in covering erroneous records unless they are used in large quantities, and the use of large quantities may reduce the thermal sensitivity of the correction thermal transfer member. lower.

Therefore, the use of a colorant with a refractive index of 1.8 or more is important in obtaining a corrective thermal transfer member with excellent hiding power and high thermal sensitivity. Furthermore, in the present invention, since each of the colorants described above can be used, even when plain paper is colored,
By appropriately selecting a colorant or by appropriately blending a colorant, it is possible to easily obtain a correction thermal transfer member having a similar color to that of the plain paper.

In addition, the thermal transfer member for correction of the present invention has a reflectance of 60%.
The above fillers can be used in combination. By using this product in combination, it is possible to improve the hiding power of erroneous recordings and at the same time obtain a product with improved thermal sensitivity.

Table 2 shows specific examples of fillers with a reflectance of 60% or more.

Table 2 - Filler Reflectance (white light) (%i Silver 90 Rhodium 80 Aluminum 75 Zinc 75 Nickel 60 Platinum 60 The shape of the filler may be any shape such as granules or strips; The particle size is 0.1 to 10 μm, preferably 0.1 to 10 μm.
It is 1 to 2 μm. This filler can be used in combination with the colorant, and a coating solution containing the filler can also be applied onto a coating layer containing the colorant.

The thermal transfer member for correction of the present invention can be applied to a support such as paper, synthetic paper, condenser paper, plastic film, etc. using the above-mentioned colorant, color developer and, if necessary, a light reflectance of 60%.
% or more of the filler. In addition, this hot-melt ink transfer layer for correction includes:
Melting point or softening point as shown below is 50-130'C
Thermoplastic or thermosetting resins can be applied as binders.

Polystyrene, polypropylene, petroleum resin, acrylic resin, vinyl chloride resin, vinyl acetate resin, vinylidene chloride resin, polyvinyl alcohol, cellulose resin, polyamide, polyacetal, polycarbonate, polyester, fluororesin, silicone resin, natural rubber, chlorinated rubber, butadiene rubber , olefin rubber, phenolic resin, urea resin, melamine resin, epoxy resin, polyimide, etc.

The amount of such resin used is generally 0.01 to 1 part by weight, preferably 0.05 to 1 part by weight, per 1 part by weight of the colorant.
It is about 0.5 part by weight.

Furthermore, various waxes and plasticizers can be added to the corrective heat-sensitive transfer layer of the present invention. In this case, examples of the wax include carnauba wax, montan wax, paraffin wax, microcrystalline wax, and the like, and examples of the plasticizer include dioctyl phthalate, tricresyl phosphate, dibutyl phthalate, and the like. These things are in the transfer layer,
Usually, it is blended in a proportion of 10% by weight or less.

When applying the corrected circumferential rotation four copy layer forming ink liquid to the support, a solvent coating method, a hot melt coating method, an aqueous emulsion coating method, etc. can be employed as the coating method. The amount of adhesion of the transfer layer formed on the support is 1 to 50 g/n (preferably 3 to 30 g/n) on a dry weight basis.
/ rJ. Further, in the case of the present invention, the composition of the transfer layer ink is adjusted so that the melt viscosity at the time of transfer is higher than the melt viscosity of the transfer layer on a recording transfer sheet when a recorded image is used on plain paper. .

When the melt viscosity of the correction transfer layer is lower than the melt viscosity of the recording transfer layer, when thermal transfer for correction is performed on a correction area on plain paper, the correction transfer layer becomes deeper and normal than the recording ink existing at the correction area. If it penetrates into the paper or mixes with the recording ink, it becomes impossible to sufficiently cover the erroneously recorded ink, and the erroneously recorded ink becomes insufficiently concealed by the molten correction ink. Such inconveniences can be avoided by increasing the melt viscosity of the correction transfer layer ink as described above.

Note that the transfer sheet for image recording is a conventionally known one, and is one in which a heat-melting ink transfer layer is provided on a support such as a plastic film, paper, or synthetic paper. In this case, the transferable ink transfer layer may contain pigments or dyes having the desired color, such as carbon black, cyanine blue, rose bengal, crystal violet lactone, etc., similar to those shown in the formation of the corrective transfer layer. It includes binders and waxes. To perform recording using such a transfer sheet, stack it on plain paper so that its transfer layer is in contact with the surface of the plain paper, and perform thermal printing from the back side of the transfer sheet (the side without the transfer layer). . This records the transferred ink image on the plain paper.

In order to correct a transferred ink image formed as an erroneous recording on plain paper using the correction thermal transfer member of the present invention,
Apply the thermal transfer member for correction of the present invention to the location of the erroneous recording.
The transfer layer is stacked so as to be in contact with the erroneously recorded surface, and thermal printing is performed from the surface of the correction member on a plane including the erroneously recorded portion or in the same image as the erroneously recorded portion. As a result, the erroneous recording is coated with the ink transferred from the correction thermal transfer layer, and the erroneous recording becomes invisible, and at the same time, correct recording by retransfer by thermal printing becomes possible. Moreover, the corrected area is not particularly noticeable because it has the same color as the plain paper due to the transferred colorant.

Next, place the recording transfer sheet 1 again on top of this corrected area.
Overlap ~ to thermally print the correct record. As a result, a properly recorded image is formed at the corrected location.

〔effect〕

The present invention has the above-mentioned configuration, and it is possible to correct the erroneous recording that occurred during thermal transfer, and to easily obtain a correctly recorded image at the corrected location again by normal thermal transfer. Moreover, in this case, the modified portion is not particularly noticeable. Therefore, the thermal transfer member for correction of the present invention is extremely effective as a member for correcting erroneous recording in thermal transfer recording using a heat-melting ink layer.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples. Note that all parts and percentages listed below are based on weight.

Example 1 (1) Preparation of thermal transfer medium for recording (^-1) Carbon black 15 parts Carnauba wax 30 parts Microcrystalline wax 30 parts (mp 80°C
) A composition consisting of 15 parts of styrene resin and 10 parts of silica was applied by hot melt coating onto the surface of a 6 μm thick polyester film, and the coating amount was 4.
A transfer sheet (A-1) of g/r/ was created.

(2) Preparation of thermal transfer member for correction (B-1) A composition consisting of 30 parts of titanium oxide (rutile type), 10 parts of carnauba wax, 5 parts of polyester resin, and 100 parts of methyl ethyl ketone was dispersed in a ball mill for 10 hours until the thickness was 6 μm.
A heat-sensitive transfer member (B-1) for correction with an adhesion weight of 20 g'/rrf was prepared by coating the surface of a commercially available polyester film with a wire bar and drying.

When the thus obtained transfer sheet (^-1) was brought into contact with white plain paper and 1 mJ of heating energy was applied, a black image with an image density of 1.40 was obtained.

Next, on this image, a thermal transfer member for correction (13-1) is applied.
When 2.5 mJ of heating energy was applied, the black image was almost completely hidden and became unreadable. Furthermore, when the transfer sheet (A-1) is brought into contact with the same spot again and 1 mJ of heating energy is applied, 1.37
A clear black image was obtained.

Example 2 (1) Preparation of thermal transfer member for correction (B-2) [Liquid A] A composition consisting of 10 parts of zinc white, 10 parts of carnauba wax, and 5 parts of styrene resin was dispersed for 10 hours using a ball mill.

[Liquid B]

Fine aluminum powder 5 parts Polyvinyl alcohol 10% aqueous solution 20 parts Water 100
The composition consisting of 1 part is dispersed in a ball mill for 3 hours.

Next, liquid A obtained as above was applied and dried on the surface of a 6 μm thick polyester film using a wire bar to give a coating weight of 3 g/nf, and liquid B was further applied and dried to a total of 45 g/nf. rrr correction thermal transfer member (872
)It was created. The correction member thus obtained (B
-2) and the black image area on the plain paper obtained in Example 1 were superimposed and heating energy of 1.5 mJ was applied using a thermal head, and the black image was almost hidden. Furthermore, when the transfer sheet 1-(A-) is brought into contact with the same spot again and 1 mJ of heating energy is applied, the image density is 1 again.
．． Thirty-nine black images were obtained.

Example 3 (1) Creation of thermal transfer member for correction (B-3) Zinc sulfide
A composition consisting of 30 parts paraffin wax, 10 parts, 1 part phthalocyanine blue and 100 parts luene was dispersed in a ball mill for 10 hours, applied to the surface of a 6 μm thick polyester film using a wire bar and dried to give a coating weight of 25 g/nf. A thermal transfer member for correction (B-3) was created.

Next, the transfer sheet (A-1) obtained in Example 1 was brought into contact with plain paper colored blue, and when 1 mJ of heating energy was applied, a black image with an image density of 1.40 was obtained. Next, when a correction member (B-3) was brought into contact with this image and 3.0 mJ of heating energy was applied with a thermal head, the black image could hardly be read.

Patent applicant Rico Co., Ltd. Representative Patent Attorney Toshiaki Ikeura

Claims (1)

[Claims] (1) When performing thermal transfer using a transfer sheet having a heat-melting ink transfer layer and plain paper, a member applied to correct erroneous recordings formed on the plain paper,
a coloring agent with a refractive index of 1.8 or more that is similar to the color of the plain paper;
A modification characterized in that a hot-melt ink transfer layer containing an optional filler with a reflectance of 60% or more and exhibiting a higher melt viscosity than the transfer layer of the transfer sheet is provided on the support. Thermal transfer material for use.