JPS6019588A - Thermal transfer recording type label - Google Patents

Abstract

PURPOSE:To eliminate errors in reading image information, by constituting a label of a transfer sheet having a transfer layer comprising a coloring agent, a thermoplastic substance and a thermoplastic resin and a receiving sheet having a receiving layer comprising a filler having a specified oil absorption on the surface thereof. CONSTITUTION:A coloring agent, a thermoplastic substance and a thermoplastic resin are applied to a base in the form of a heat-fusible mixture to provide a transfer layer, thereby producing the transfer sheet. A filler having an oil absorption of not less than 50ml/100g is applied to the surface of a base such as a paper and a plastic film together with a binder to provide a receiving layer, and a releasable base paper is adhered to the back side of the base through a conventional pressure-sensitive adhesive layer so that the base can be adhered to a solid surface, thereby producing the receiving sheet. The said transfer sheet and receiving sheet are laminated on each other so that the transfer layer makes close contact with the receiving layer, thereby obtaining a thermal transfer recording type label. The filler may be diatomaceous earth, aluminum oxide, titanium oxide or the like.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a thermal transfer recording type label.

[Prior art]

Conventionally, thermal recording paper is known which contains a leuco dye on the surface of a sheet-like support as a main component and an acidic substance that causes the leuco dye to develop color when heated, and this thermal recording paper is used as a thermal recording type packaging label. It is proposed to do so. In the case of such heat-sensitive recording type labels, the printing method is based on a thermal head, so compared to the conventional printing method using ink or ink ribbon, f[2I is printed simply and beautifully. (with the advantage of gaining)

However, in the case of heat-sensitive recording paper, the heat-sensitive coloring layer has
When plasticizers applied to plastic films such as dioctyl phthalate (OOP) and dioctyl adipate (DOA) permeate, there is a problem that the printed area (colored area) fades, so it is difficult to use TI as a label for plastic film packaging. cannot be applied. Example l
f. At mass retailers such as Sunobe, in order to sell fresh foods, they put fish, vegetables, meat, etc. into plastic bags, such as Styrofoam, and place the whole thing in a plastic bag.
1) The force of auto-wrapping with a plastic film such as J-vinyl chloride, and then pasting a label with the weight value printed on the wrap.1. In this case, if conventional thermal paper is used as a label, when the label and wrap film are brought into close contact by stacking packaged items, the plasticizer in the wrap film will enter the heat-sensitive coloring layer on the label surface. After a certain amount of time has passed, the printing on the surface of the label disappears, causing a major hindrance to product sales. Furthermore, such leuco-based heat-sensitive recording labels also have problems such as background fogging under high temperature and high humidity, image deterioration due to light, and background discoloration.

On the other hand, in order to avoid such problems, it has been proposed to use a transfer sheet in which a heat-melt ink layer containing a colorant is provided on a support in combination with paper as a receiving sheet. In this case, the fixability of the transferred image formed on the receiving sheet is poor, and when the surface of the image is rubbed, image fading occurs and the background is stained.

Further, when such an image with poor fixability is optically read by a scanner, the image is rubbed and becomes unclear, making it impossible to read.

〔the purpose〕

An object of the present invention is to provide a thermal transfer recording type label that overcomes the above-mentioned drawbacks.

〔composition〕

According to the present invention, the transfer sheet has a transfer layer containing a colorant, a thermofusible substance, and a thermoplastic resin, a receiving layer containing a filler with an oil absorption of 50 mQ/100 g or more on the surface, and a receiving layer on the back surface. A heat-sensitive transfer recording type label is provided which comprises a receiving sheet having a release liner with an adhesive layer interposed therebetween.

As the coloring agent used in the present invention, conventionally known organic or inorganic pigments or dyes are applied, such as black coloring agents such as carbon black, triiron tetroxide, nigrosine base, etc.
In addition to blue colorants such as cyanine blue, oil blue, and alkali blue, examples include iosol red, rose bengal, crystal violet, and brilliant green.

The transfer sheet used in the present invention contains the colorant as described above,
It is supported on a support together with a thermofusible substance and a thermoplastic resin, and the thermofusible substance in this case is
Animal waxes such as beeswax and shellac wax, vegetable waxes such as carnauba wax, mineral waxes such as montan wax, petroleum waxes such as paraffin wax and microcrystalline wax, polyhydric alcohol esters of higher fatty acids, and higher amides. , higher amines, condensates of fatty acids and amines,
Condensates of aromatic carboxylic acids and amines, synthetic (rough-fins, higher fatty acids or their engineered esters, amides or metal salts, chlorinated paraffins, benzoic acid phenyl esters, higher linear glycols, 3,4-epoxy-hexane) Examples of thermoplastic resins include dialkyl hydrophthalates, higher ketones, and other thermofusible organic compounds that have a melting point of about 50 to 200°C.Also, examples of thermoplastic resins include petroleum resins, cyclized rubber, and polyacetic acid. Examples include vinyl, polyvinyl chloride, vinyl chloride/vinyl acetate copolymer, polyacrylic ester, polyacrylamide, polyacrylic ester, polybutadiene, and the like.

To prepare the transfer sheet of the present invention, the above-mentioned colorant, thermofusible substance, and thermoplastic resin are applied onto a support in the form of a hot melt mixture, or dissolved or dispersed in a suitable solvent. The resulting coating liquid is applied onto a support to form a transfer layer. in this case.

The ratio of these components used is preferably 1 to 10 parts by weight of the thermofusible material and 1 to 5 parts by weight of the thermoplastic resin per 1 part by weight of the colorant. It is important to specify the proportion of the thermofusible substance; if the proportion of the thermofusible substance is too small, the transfer efficiency will be poor, while if it is too large, background stains will easily occur. Supports include capacitor paper, glassine paper,
Papers such as tracing paper and plastic films such as polyester, polycarbonate polyimide, and Teflon are preferably used.

In the present invention, in relation to the transfer sheet described above, as a receiving sheet, the surface has an oil absorption amount (JIS 510
1) 50m Q/100g or more, preferably 10
A receptive layer containing a filler of 0 mQ/100 g or more is used. In this case, organic and inorganic fillers are used, such as diatomaceous earth, aluminum oxide, titanium oxide, magnesium carbonate, calcium carbonate, silica, magnesium aluminosilicate, urea/formalin resin particles, polystyrene resin particles, etc. can be mentioned.

To prepare a receptor sheet, the filler described above may be applied together with a binder onto the surface of paper, plastic film, or the like. In this case, the binder is preferably a water-soluble polymer, a hydrophobic polymer, or any other polymer such as an aqueous emulsion type hydrophobic polymer in a proportion of -0.1 to 5 parts by weight, and the binder is 0.1 to 5 parts by weight. If the amount is less than 1 part by weight, the filler tends to fall off, and if it exceeds 5 parts by weight, the transferred image will not be sufficiently accepted during transfer, resulting in a high density, clear image with good fixing properties. It becomes difficult to obtain images.

A release mount is also adhered to the back side of the receiving sheet via a conventional pressure-sensitive adhesive layer so as to be able to adhere to a solid surface.

〔effect〕

The thermal transfer recording type label of the present invention has the above-described structure, and the transferred image formed on the receiving sheet by thermal transfer has excellent fixability, and does not stain even if the surface is rubbed. No reading errors occur when image information is optically read by a scanner.

〔Example〕

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

Example A: Creation of transfer sheet (A) Coating liquid composition: Carbon black 1 part Carnauba wax 4 N Polyvinyl acetate emulsion 4 tt (solid content 50%)
) Water 2Qn The above coating liquid was coated on a 12 μm thick condenser paper to a dry weight of 3 g/l112 and dried to prepare a transfer sheet (A).

B: Creation of receptor sheet (B) Coating liquid composition: Kaolin 1 part Polyvinyl alcohol 6/I (20% aqueous solution) Apply the above coating liquid to the surface of high-quality paper (basis weight 50 g/m2) so that the dry weight is 3 g/m2. Apply and dry. Next, a release paper coated with silicone resin with an adhesive layer on the silicone resin side is pasted to this back side via the adhesive layer, and then cut out to an appropriate size. A receiving release paper (B) was prepared as a receiving sheet.

Comparative Example 1 A transfer sheet (C) was prepared in the same manner as in the above Example except that no thermofusible substance was used.

Comparative Example 2 In the receiving sheet shown in the above example, the paper itself without a filler layer was used as receiving sheet 1-(D).

[Evaluation of transferred image]

The transfer sheet and receiving sheet obtained above are stacked so that the transfer layer and the receiving layer are in close contact with each other, and then printed using a label printer with a built-in thermal head from the side of the transfer sheet that does not have the transfer layer. Printed by heating. The heating printing conditions in this case were a heating temperature of 130° C. and a heating time of 5 m5ec.

Next, the fixability and density of the transferred image formed on such a receiving sheet were evaluated in the following manner.

Image fixing property: When the image area was rubbed with a finger, a sample that did not cause image staining was graded Q, and a sample that caused image staining was graded x.

Image density: Image density was measured using a Macbeth densitometer RD-514 (using a Ratten filter).

The above evaluation results are summarized in the following table.

table

Claims (1)

[Claims] (1) A transfer sheet having a transfer layer containing a colorant, a thermofusible substance, and a thermoplastic resin, and an oil absorption amount of 50 mA/
A thermal transfer recording type label comprising a receptor layer containing 100 g or more of filler and a receptor sheet having a release mount on the back side with an adhesive layer interposed therebetween.