JPH1044633A - Melting type thermal transfer recording acceptive paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate no foul on white paper sections and recording sections by containing a release agent of a specified wt.% composed of at least one kind selected from a phosphate ester having an aliphatic hydrocarbon group of a specified carbon number, its amine salt and lecithin to a pigment in an acceptive layer. SOLUTION: A lubricant (release agent) of superior release effect composed of at least one kind selected from a phosphate ester having a 6-22C aliphatic hydrocarbon group, its amine salt and lecithin is contained in an ink acceptive layer. The release agent of 2-10wt.% to a pigment is used. When the release agent is less than 2wt.%, its effect is insufficient, and in the case of printing under a high temperature and low humidity environment, foul can be generated easily at the temperature when a thermal head gets high in the continuous printing or the like. On the other hand, when the release agent is beyond 10wt.%, changes such as the lowering of surface strength, lowering of sensitivity and the change of color and the like are generated, and also in the coating process, the adverse effect such as foaming is generated and the coating properties become insufficient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving paper for fusing type thermal transfer recording (hereinafter simply abbreviated as receiving paper) utilizing a thermal fusing ink type thermal transfer recording system, and more particularly to ink receptivity and dot reproducibility in full color. The present invention relates to a receiving paper having excellent recording quality and high recording quality.

[0002]

2. Description of the Related Art With the advance of OA in recent years, copiers, printers, facsimile machines and the like using various recording systems such as an electrophotographic system and a thermal transfer recording system have been widely used according to their respective applications. I have. Colored coloring materials are used for this image formation, and usually, the coloring materials are melted, evaporated, and sublimated and transferred onto a recording medium such as paper or a film sheet, and the recorded image is formed by adhesion, adsorption, and dyeing action. It has gained.

[0003] In this type of recording method, a hot-melt ink type in which an ink ribbon or an ink sheet having a heat-meltable ink layer is melted by heat generated by a thermal head, and a color material is transferred to a recording medium to obtain a recorded image. Has recently attracted attention. This system is characterized in that plain paper can be used as recording receiving paper.

[0004] However, this thermal transfer recording system, like the other recording systems, has full-color recording, high-speed recording, clear images,
Demands for higher resolution have increased, and plain paper has become unsatisfactory. For example, when performing multi-color recording with a color thermal transfer printer or the like, a recording material is combined with a recording material by combining a color material such as yellow, magenta, cyan, and black with an ink ribbon having waxes or resins, and applying the recording medium. A transfer image is formed thereon. In the case of full-color multi-color recording, ink of each color overlaps, so if plain paper is used as the recording paper, defects such as transfer unevenness and missing dots will occur due to the smoothness of the ink receiving layer surface and ink acceptability. Is likely to occur, which is a drawback.

For this purpose, Beck smoothing is specified as a method for improving the surface smoothness of a receiving paper for recording (Japanese Patent Application Laid-Open No.
0-110488), a method of providing a thermal transfer receiving layer containing a specific pigment or binder (Japanese Patent Application Laid-Open No. 60-11 / 1985)
No. 0489, JP-A-60-110490) and the like are already known. However, transfer unevenness and color misregistration in the overlapping portion of the color inks of the multi-color recording, or deterioration of image clarity due to missing of transfer ink dots and poor reproducibility of dot shapes have not been completely solved.
Therefore, it is not sufficient to simply enhance the smoothing treatment or the like to increase the smoothness, or to simply include a pigment or a binder in the thermal transfer receiving layer.

Conventionally, line type thermal heads are frequently used in full-color recording of the fusion type thermal transfer recording method because high-speed printing is possible. Serial type thermal heads are mainly used in the field of monochrome printing such as word processors. In recent years, with the expansion to personal applications, printers have been required to be smaller, lighter and more affordable, and in the field of full-color recording, a system using a serial system has been developed. I have.

[0007] In the above-described full-color recording paper by the fusion type thermal transfer recording system, in the case of a conventional receiving paper provided with an ink receiving layer mainly containing a pigment or a binder,
Smears are likely to occur on blank paper portions and recording portions, and it is difficult to obtain desired recorded images. Such a phenomenon remarkably occurs particularly when printing is performed in a high-temperature and low-humidity environment. There is a strong demand for receiving papers that can eliminate such defects and have excellent dot reproducibility and obtain high-quality recorded images.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a receiving paper for use in a fusion type thermal transfer recording system.
Even when printing in a high-temperature, low-humidity environment, no smudges occur on the blank paper and recording areas, and ink transfer acceptability, reproducibility, fixability, gradation, and sharpness (without dot thickening and bridging) The present invention provides a fusing type thermal transfer recording receiving paper which is excellent in (1) and can obtain a high quality recorded image.

[0009]

According to a first aspect of the present invention, there is provided a receiving paper for fusion-type thermal transfer recording comprising a base paper on which an ink-receiving layer containing an adhesive and a pigment as main components is provided. The receiving layer contains at least one release agent selected from a phosphoric acid ester having an aliphatic hydrocarbon group having 6 to 22 carbon atoms, an amine salt thereof and lecithin in an amount of 2 to 10% by weight based on the pigment. It is characterized by containing. The receiving paper for fusion-type thermal transfer recording of the present invention is J
The coefficient of static friction between the surfaces of the ink receiving layers based on ISP 8147 is preferably 0.20 to 0.45. Further, the receiving paper for fusion-type thermal transfer recording of the present invention is a JI.
Based on SP 8137, surface tension 32 dyne / c
It is preferable that the falling length of the surface of the ink receiving layer is 100 to 170 mm when 30 μl of the wetting reagent is dropped and measured. Further, in the receiving paper for fusion type thermal transfer recording of the present invention, the pigment is preferably spherical light calcium carbonate having an average particle diameter of 1 to 10 μm.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors relate to a receiving paper used for a fusion type thermal transfer recording system, and can print in a high temperature and low humidity environment (for example, about 35 ° C. and 30% RH) as well as a normal environment. The present inventors have conducted intensive studies in order to obtain a receiving paper which does not generate stains, is excellent in ink transfer receptivity, reproducibility, etc., and can obtain a high-quality recorded image. As a result, a phosphoric acid ester having an aliphatic hydrocarbon group having 6 to 22 carbon atoms in the ink receiving layer,
By containing the amine salt and at least one lubricant selected from lecithin and having an excellent releasing effect (release agent), a high-quality recorded image can be obtained, and the white paper portion and the recording portion can be stained. And found that the present invention was completed.

Conventionally, in the pulp and paper industry, for example, in the production of cast paper, various lubricants have been used as release agents, and specific examples thereof include fatty acids such as stearic acid and oleic acid and metal salts thereof, polyethylene emulsions and the like. Hydrocarbons, higher alcohols such as stearyl alcohol, and funnel oil. However, when a normal lubricant was incorporated into the receiving paper, the transfer acceptability of the ink was significantly poor, so that it was not used. The present inventors have paid attention to relaxing the adhesion between the pigment on the surface of the ink receiving layer and the ink ribbon and the rubbing property, and as a result of intensive studies on the release agent contained in the ink receiving layer, a specific release agent was obtained. It has been found that by selecting, a receiving paper free of stains can be obtained without impairing the ink transfer receptivity, especially when printing in a high-temperature, low-humidity environment.

The release agent of the present invention includes, for example, triethanolamine monostearyl phosphate, monoethanolamine dioctyl phosphate, triethylamine trilauryl phosphate, and lecithin extracted from soybean and egg yolk. Can be Lecithin is not limited to natural products as described above, but also includes various synthetic phosphatidylcholine derivatives, for example, phosphatidylcholine derivatives such as phosphatidylethanolamine and phosphatidylinositol. The release agent of the present invention is used in an amount of 2 to 10 with respect to the pigment.
% By weight. If the release agent is less than 2% by weight, the effect is insufficient, and when printing is performed in a high temperature and low humidity environment,
If the temperature of the thermal head becomes high in continuous printing or the like, dirt tends to occur. On the other hand, if the content exceeds 10% by weight, the surface strength is reduced, the sensitivity is reduced, the color tone is changed, etc., and further, there are adverse effects such as repelling and foaming in the coating process, and the coating suitability becomes insufficient. The release agent used in the present invention may be one or two or more types appropriately selected and used.

In the present invention, the coefficient of static friction between the surfaces of the ink receiving layers is preferably 0.20 to 0.45, and it has been found that the dots can have extremely uniform and stable shapes and do not cause background smear. As a result, a high-resolution and high-quality image without color shift was obtained. The coefficient of static friction of the receiving layer is 0.45
In the case where the ratio exceeds the threshold value, the background stain tends to occur. On the other hand, when the static friction coefficient is less than 0.25, the chip is likely to be chipped or missing. The coefficient of static friction between the surfaces of the ink receiving layers was measured in accordance with JIS P 8147, and was determined at 20 ° C. and 65% RH. H. Under the environment. Regarding the background stain on the blank part, the ink on the ribbon softened by the residual heat accumulated in the head mainly adheres to the receiving layer and adheres to the blank part other than the recording part to cause background stain. This is considered to be the cause, and it is considered that the friction coefficient of the surface of the receiving layer is related. By defining the coefficient of static friction between the surfaces of the receiving layer, a receiving paper free of background stain was obtained.

Further, in a non-heated portion of the thermal head, a phenomenon that a white paper portion or a recorded image of the receiving layer in contact with the ink ribbon is stained under a high-temperature and low-humidity environment, for example, 35%.
Accelerated when printing in an environment of 30 ° C. and 30% RH. The reason is that when the temperature becomes high, the ink is softened and easily adheres to the surface of the receiving layer. In addition, when the humidity becomes low, the surface of the ink and the receiving layer loses moisture, so that it is presumed that the cause is that the ink and the receiving layer adhere more closely.

In the present invention, the receiving paper is inclined at 45 ° (oblique angle) so that the surface tension of the ink receiving layer is 32 dy.
By adjusting the flow length when 30 μl of a ne / cm wetting reagent is dropped to 100 to 170 mm, even when printing under various environments (low temperature to high temperature, low humidity to high humidity), the blank paper And that no stains occur on the recorded image. Here, the flow length (mm) is JIS P 813
The value is a value measured according to the water repellency test method of paper and paperboard of No. 7, and by using a wetting reagent having a surface tension of 32 dyne / cm, the falling length can be measured accurately.

The falling length becomes shorter when the affinity between the receiving layer and the wetting reagent is high, and becomes longer when the affinity is low. Therefore, in the case of the receiving layer having a short flow-down length, it is determined that the affinity for ink is high, and there is a tendency that a blank portion or a recorded image is stained. If the falling length is less than 100 mm, the ink tends to adhere to the receiving layer due to high affinity, and the stain tends to occur. On the other hand, if it exceeds 170 mm, the affinity is low, and the white paper portion and the recorded image are not stained, but the ink receptivity is low, so the sensitivity is low, the image reproducibility of the dot shape is poor, and the image sharpness is poor due to poor sharpness. Recording quality may not be obtained.

The flow length of the surface of the ink receiving layer can be adjusted by adjusting the oil absorption, the particle size and the shape of the pigment, the amount of the adhesive added, the surfactant, the release agent or the lubricant. For example, in order to shorten the flow length, a pigment having a large oil absorption is used, and the amount of the adhesive added is reduced. On the other hand, in order to increase the flow length, a plate-like pigment or an organic pigment is used, or a releasing agent such as a phosphate having an aliphatic hydrocarbon group of the present invention, an amine salt thereof, and lecithin is appropriately selected. , There is a method of adding.

As the ink ribbon used in the present invention, a commercially available ink ribbon can be generally used and is not particularly limited. The wetting index measured according to the wetting test method for polyethylene and polypropylene films of JIS K 6768 is as follows. Under conditions of 20 ° C. and 65% RH, 28 to 32 (d
yne / cm), and a desired effect can be obtained for the receiving paper of the present invention.

Further, in the color recording, a single color dot of the lower layer ink is efficiently received in the ink receiving layer in a stable shape (without dropout, chipping, bleeding, background contamination, etc.), and the upper layer ink is applied. At this time, the lower-layer dots are re-melted and easily bleed in the three-dimensional direction of the receiving layer.

In the present invention, in order to receive single-color dots in a more stable shape and to prevent bleeding of the lower-layer dots in the superimposed color portion, the open area ratio of the surface of the ink receiving layer is 20% or more and the average The pore area is preferably from 0.3 to 20.0 μm ² . By the way, when the open area ratio is less than 20%, the number of the pores that accept the dots is small, so that the dots are missing. Even if the opening area ratio is 20% or more, the average pore area is 0.1%.
If it is less than 3 μm ² , the penetration of the ink decreases. Meanwhile, 2
When the thickness exceeds 0.0 μm ² , the ink easily penetrates, and the bleeding of the lower layer dots is prevented, but the unevenness of the surface is large,
In some cases, a single-color dot cannot be transferred in a stable shape. In addition, since the irregularities of the pigment become intense, the ink on the ribbon easily adheres to the image receiving layer, and the background becomes dirty.
Incidentally, the standard deviation of the pore area is preferably 8 or less. Here, the opening area ratio is a ratio (%) of the total area of the opening portion occupied by the pores to the total surface area of the ink receiving layer surface.

Further, within a range that does not impair the effects of the present invention,
Of course, various lubricants generally used can be used in combination. For example, higher fatty acids such as stearic acid, metal salts of higher fatty acids such as zinc stearate, higher fatty acid amides such as stearamide and methylolated products thereof, and hydrocarbons such as polyethylene wax may be used in combination. In particular, a wetting index of 32 to 40 (dyne / c)
It is preferable to use a lubricant containing a higher fatty acid compound having 12 to 21 carbon atoms as a main component, which is a component (m), and in a small amount, a synergistic effect can be obtained, and a decrease in surface strength, a decrease in sensitivity, a change in color tone, Less thickening and foaming of paint.

The higher fatty acid compounds having 12 to 21 carbon atoms include, for example, stearic acid, oleic acid, linoleic acid, linolenic acid, palmitic acid, myristic acid,
Higher fatty acids such as lauric acid, behenic acid, erucic acid,
Higher fatty acid metal salts such as zinc stearate, zinc behenate, calcium stearate, aluminum stearate, magnesium stearate, stearic acid amide, stearic acid bis-amide, ethylene-bis-stearic acid amide, oleic acid amide, erucic acid amide ,
It is selected from higher fatty acid amides such as behenic acid amide, and methylolated products thereof. Among these,
Stearic acid compounds are preferably used, and for example, stearic acid, calcium stearate, methylolamide stearate, bis-amide stearate and the like are more preferably used. The wetting index of the above lubricant is JIS K
This is a value obtained according to 6768. For example, as a sample for measuring the wetting index, a coating liquid is prepared by adding about 0.5% by weight of polyvinyl alcohol to the lubricant solid content to an aqueous dispersion of a lubricant, and the resultant is coated on a polyethylene film support. Dry for about 20 minutes at ℃ 5μm
A uniform lubricant layer of about m is formed, and the wetting index of the surface is measured.

In order to improve the ink receptivity of the receiving layer, it is necessary to improve the ink absorbency and transferability. The ink absorbency mainly depends on the amount of voids on the surface of the ink receiving layer and the oil absorbency of the pigment, and the transferability of the ink depends on the smoothness of the surface of the receptor layer. Therefore, the receiving layer having a large amount of voids and having high smoothness is presumed to be effective for ink absorption and transferability. However, if the oil absorption of the pigment is too high, thickening of the ink or bridging occurs. .

Examples of the pigment used in the receptor layer of the present invention include various pigments used in general coated paper, for example, clays such as kaolin, calcined clays such as calcined kaolin, calcium carbonate, magnesium carbonate, and calcium sulfate. , Barium sulfate, titanium dioxide, talc, zinc oxide,
Alumina, magnesium oxide, silica, bentonite,
Smectite, zeolite, inorganic pigments such as sericite, polystyrene resin, polystyrene-acrylic resin,
Of course, organic pigments such as vinylidene chloride resin, urea resin, melamine resin and acrylic resin, or fine hollow particles of these resins can be used alone or in combination of two or more according to quality requirements. Among these, spindle calcium carbonate, columnar calcium carbonate, acicular calcium carbonate, cubic calcium carbonate, rice granular calcium carbonate,
Hexagonal and disk-shaped calcium carbonate and other shapes of calcium carbonate are preferably used.

Further, from the viewpoint of the smoothness of the surface of the ink receiving layer and the amount of voids, among the above pigments, the average particle diameter is 1 to 10 μm.
m spherical light calcium carbonate is more preferably used,
Good recording sensitivity can be obtained by improving the heat insulating effect, the ink absorbency, the transferability, and the like. If the average particle size is less than 1 μm, the voids in the ink receiving layer will be insufficient and the ink acceptability will be poor. On the other hand, if it exceeds 10 μm, the smoothness of the surface of the receiving layer is reduced, so that dot missing or the like is likely to occur, and the recording image quality tends to be reduced. The amount of the spherical light calcium carbonate used is preferably 30% in all the pigments in the receiving layer.
To 100% by weight. If the amount is less than 30% by weight, a sufficient effect of improving ink acceptability cannot be obtained.

A specific example of the above spherical light calcium carbonate is ED-III (ED-00, manufactured by Yonesho Lime Industry Co., Ltd.).
1), ED-110, and B-1002 manufactured by Tsukumi Fine Ceramics Research Center. These generally belong to the calcite type, are spherical aggregates of fine particles, and are preferably spherical aggregates of cubic fine particles having a side length of 0.05 to 0.8 μm. Here, the average particle size of the pigment is measured based on observation with an electron microscope. The oil absorption of spherical light calcium carbonate is preferably from 25 to 80 ml / 100 g as measured in accordance with JIS K 5101, and the receiving layer is excellent in ink receptivity.

Further, by using a suitable amount of a plate-like clay such as a hexagonal plate in the pigment of the receiving layer, it becomes easy to enhance the smoothness of the surface of the receiving layer, and it is difficult to generate stains. May be used in combination as appropriate. The amount of the plate-shaped clay used is preferably about 0 to 30% by weight, more preferably 10 to 20% by weight, based on all the pigments in the receiving layer.

As the adhesive used for the receptor layer, a water-soluble or water-dispersible polymer compound is used. For example, cationic starch, amphoteric starch, oxidized starch, enzyme-modified starch, and thermochemically modified starch are used. , Esterified starch, starches such as etherified starch, cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose, natural or semi-synthetic polymer compounds such as gelatin, casein, soybean protein, natural rubber; polyvinyl alcohol, isoprene, neoprene, polybutadiene Such as polydienes, polybutene, polyisobutylene, polypropylene, polyalkene such as polyethylene, vinyl halide, vinyl acetate, styrene, (meth) acrylic acid, (meth) acrylic acid ester, (meth) acrylamide, and vinyl vinyl such as methyl vinyl ether. Examples thereof include synthetic polymer latexes such as copolymers and copolymers, styrene-butadiene-based, and methyl methacrylate-butadiene-based synthetic polyurethanes, polyurethane resins, polyester resins, polyamide resins, olefin-maleic anhydride resins, and melamine resins. it can. One or two or more of these are appropriately selected and used according to the quality target of the fusion type thermal transfer receiving paper.

The mixing ratio of the adhesive is 7 to the pigment component.
５０50% by weight. By the way, when the content is less than 5% by weight, the surface strength of the receiving layer is insufficient, and the shape of the dot is likely to be lost. On the other hand, if the content exceeds 50% by weight, voids formed by pigments and the like are filled,
The ink receptivity tends to decrease, and the recording sensitivity tends to decrease.

In the coating liquid for the receptor layer, in addition to these, various auxiliaries such as a surfactant, a pH adjuster, a viscosity adjuster,
Softeners, gloss agents, waxes, dispersants, flow modifiers, antistatic agents, stabilizers, antistatic agents, crosslinkers, sizing agents, optical brighteners, colorants, ultraviolet absorbers, defoamers Water-proofing agents, plasticizers, preservatives, fragrances and the like can be used as needed.

The coating amount of the coating composition is selected according to the purpose of use of the receiving paper of the present invention, but generally, the extent to completely cover the fibers on the base paper surface is sufficient. It is necessary and a dry weight of 6 to 30 g / m ² per side is appropriate. As a coating method for forming the receiving layer, generally known coating apparatuses such as a blade coater, an air knife coater, a roll coater, a reverse roll coater, a bar coater, a curtain coater, a die slot coater, a gravure coater, a champlex coater, and a brush coater , Two-roll or metering blade type size press coater, bill blade coater, short dwell coater,
A device such as a gate roll coater is appropriately used. These devices are used in a conventional manner as an on-machine coater or an off-machine coater.

In forming the receiving layer, the receiving layer is
It is also possible to have a multilayer structure of two or more layers if necessary. In the case of a multilayer structure, each coating liquid does not need to be the same, and may be appropriately adjusted and blended according to a required quality level, and is not particularly limited. Further, it is also possible to provide a coating layer made of a synthetic resin layer, a pigment and an adhesive, an antistatic layer, and the like on the back surface of the support to prevent curling, impart printability, and supply paper distribution. Further, the back surface of the support may be subjected to various processes, for example, post-processes such as adhesion, magnetism, flame retardancy, heat resistance, water resistance, oil resistance, and anti-slipping, so that the support can be used with added applicability.

The receiving paper of the present invention is finished after the usual drying step and before the surface treatment step by adjusting the water content to about 3 to 10% by weight, more preferably about 4 to 8% by weight.
In addition, the smoothing processing method is generally performed by a known smoothing apparatus, and when performing the smoothing processing, JIS P81
By adjusting the Beck smoothness according to No. 19 to 300 to 2,000 seconds (10 ml), a higher quality recorded image desired by the present invention can be obtained. When the Beck smoothness is less than 300 seconds, transferability of ink and reproducibility such as chipping of dots are significantly reduced. On the other hand, if it exceeds 2,000 seconds, paper feeding failure occurs, or the voids formed by the spherical light calcium carbonate of the present invention are destroyed by the smoothing treatment, and ink acceptability tends to decrease,
In some cases, a desired recorded image cannot be obtained.

The filler to be incorporated in the base paper used in the present invention is not particularly limited. For example, talc, kaolin, clay, calcined kaolin, delamikaolin, heavy calcium carbonate, light calcium carbonate, Minerals such as magnesium carbonate, titanium dioxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, magnesium sulfate, magnesium silicate, calcium sulfate, calcium silicate, white carbon, aluminosilicate, silica, sericite, and smectite Fillers, organic synthetic fillers such as polystyrene resin fine particles, urea formalin resin fine particles, and fine hollow particles, and the like, and fillers contained in used paper, broken paper, and the like can be recycled.

In the paper stock, besides pulp fibers and fillers, various anionic, nonionic, cationic or amphoteric substances conventionally used may be used as long as the desired effects of the present invention are not impaired. The papermaking internal additives such as retention aid, drainage improver, paper strength enhancer and internal sizing agent are appropriately selected and used as needed. In addition, dye, fluorescent brightener, pH
An internal additive for papermaking such as a conditioner, an antifoaming agent, a pitch control agent, and a slime control agent is appropriately added according to the use of the paper.

The papermaking method is not particularly limited. For example, an acidic papermaking method in which the papermaking pH is around 4.5, an alkaline filler such as calcium carbonate as a main component,
It can be applied to all papermaking methods such as a so-called neutral papermaking method in which H is weakly acidic of about 6 to weakly alkaline of about 9, and the papermaking machine is also a fourdrinier paper machine, a twin wire paper machine, a round mesh paper machine. ,
A Yankee paper machine can be used as appropriate.

If necessary, the surface of the base paper is sized with an aqueous adhesive or an aqueous adhesive containing a filler. Examples of the aqueous adhesive include the same adhesives as those used for the above-mentioned receiving layer. Also, the filler is not particularly limited, but includes mineral fillers similar to the filler compounded in the base paper described above, organic synthetic fillers, and the like. One type or two or more types are appropriately selected and used accordingly.

As the base paper, synthetic paper can be used in addition to paper base materials such as plain paper and coated paper for printing. When using synthetic paper, the coating amount of the receiving layer is 1% by dry weight.
-20 g / m ² , and the Bekk smoothness of the surface of the receiving layer is preferably 300-10,000 seconds.

The smoothing treatment of the receiving paper for fusion type thermal transfer recording is carried out by a smoothing treatment device such as a normal super calender, gloss calender or soft calender. Further, it is appropriately used in an on-machine or an off-machine, and the form of the pressure device, the number of pressure nips, and the like are appropriately adjusted according to a normal smoothing device.

[0040]

EXAMPLES The present invention will be described in more detail with reference to the following examples, which, of course, are not intended to limit the scope of the present invention. In the examples, “parts” and “%” indicate “parts by weight of solid content” and “% by weight” unless otherwise specified. Example 1 [Preparation of base paper] LBKP (freeness = 480 ml) 1
20 parts of talc as a filler in 00 parts of pulp slurry,
1.5 parts of a rosin emulsion sizing agent and 2 parts of a sulfuric acid band were added, and the mixture was diluted with white water to have a pH of 5.0.
3. A stock having a solid content of 1.1% was prepared. The stock is made using a Fourdrinier machine, and then oxidized starch (trade name:
Ace A, manufactured by Oji Cornstarch Co., Ltd.) was applied using a size press so that the applied amount would be 4.0 g / m ² in terms of dry weight, dried, and smoothed with a machine calender to a smoothness of 80 seconds. Was 97 g / m ² .

[Preparation of Coating Solution for Receptive Layer] 100 parts of spherical light calcium carbonate (trade name: ED-III, manufactured by Yonesho Lime Industry Co., Ltd.) having a mean particle size of 3.0 μm as a pigment (solid content; the same applies hereinafter) ) And sodium polyacrylate (trade name: ARON T-40, manufactured by Toagosei Co., Ltd.) as a dispersant.
5 parts (solid ratio to pigment; the same applies hereinafter) were added, and the mixture was dispersed in water using a CORES disperser to prepare a pigment slurry.
20 parts of polyvinyl alcohol, 3 parts of styrene-butadiene copolymer latex, 3 parts of lecithin (an emulsion of soybean extract lecithin emulsified with a nonionic activator) as a release agent, and calcium stearate (trade name) as a lubricant : 10 parts of SN coat 284, manufactured by San Nopco, wet index 34 (dyne / cm)) were added and stirred, and water was further added to obtain a solid matter concentration of 40.
A coating solution of weight% was prepared.

[Preparation of Receiving Paper] The prepared coating liquid for a receiving layer was coated on one side of the above-mentioned base paper using a bar coater so that the dry weight was 15 g / m ^2, and the water content was 7%. The receiving layer was dried to obtain a receiving paper having a Beck smoothness of 500 seconds.

Example 2 A receiving paper was prepared in the same manner as in Example 1 except that the amount of lecithin as a release agent was changed to 5 parts and calcium stearate as a lubricant was removed in the preparation of the coating solution for the receiving layer. I got

Example 3 In the preparation of the coating solution for the receiving layer, the pigment was prepared by adding an average particle diameter of 1.
5 μm spherical light calcium carbonate (trade name: ED-07)
1002, manufactured by Yonesho Lime Industry Co., Ltd.) 100 parts, and the release agent was monostearyl phosphate triethanolamine 5
And receiving paper was obtained in the same manner as in Example 1 except that the amount of calcium stearate as the lubricant was removed.

Example 4 In the preparation of the coating solution for the receiving layer, the pigment was added with an average particle diameter of 10
μm spherical light calcium carbonate (trade name: B-100
2. Tsukumi Fine Ceramics Research Center) 100
The receiving paper was obtained in the same manner as in Example 1 except that the parts and the releasing agent were changed to 5 parts of dioctyl phosphate monoethanolamine, and calcium stearate as a lubricant was removed.

Example 5 In the preparation of the coating liquid for the receiving layer, the pigment was added to a coating material having an average particle size of 0.1.
4 μm cubic light calcium carbonate (trade name: TP-2
The receiving paper was obtained in the same manner as in Example 1 except that the amount was changed to 100 parts (22HS, manufactured by Okutama Industry Co., Ltd.) and calcium stearate as a lubricant was removed.

Example 6 Receiving paper was prepared in the same manner as in Example 1 except that the amount of lecithin as a release agent was changed to 9 parts and calcium stearate as a lubricant was removed in the preparation of the coating solution for the receiving layer. I got

Example 7 In the preparation of the coating liquid for the receiving layer, the pigment was added to the pigment having an average particle diameter of 2.
5 μm spherical light calcium carbonate (trade name: TP-CP
C, manufactured by Okutama Kogyo Co., Ltd.), 50 parts of amorphous calcined kaolin (trade name: Ansilex 93, manufactured by Engelhard) having an average particle diameter of 0.3 μm, and hexagonal plate-shaped clay having an average particle diameter of 0.4 μm (product) Name: Ultra White 90, manufactured by Engelhard Co.) Accepted in the same manner as in Example 1 except that the addition amount of lecithin as a release agent was changed to 20 parts and calcium stearate as a lubricant was removed. I got the paper.

Example 8 In the preparation of a coating solution for an image receiving layer, a pigment was prepared by adding an average particle size of 1.
5 μm columnar light calcium carbonate (trade name: TP-12
A receiving paper was obtained in the same manner as in Example 1 except that the amount of lecithin as a release agent was 2 parts, and calcium stearate as a lubricant was removed to 100 parts of Okutama Kogyo Co., Ltd.

Example 9 In the preparation of the coating solution for the image receiving layer, the pigment was added with an average particle diameter of 3.
0 μm spherical light calcium carbonate (trade name: ED-III
50 parts, average particle diameter 0.3 μm
30 parts of calcined kaolin (trade name: Ansilex 93, manufactured by Engelhard Co.) and 20 parts of clay (tradename: Ultra White 90, manufactured by Engelhard Co.) having an average particle diameter of 0.2 μm were mixed with lecithin as a release agent. A receiving paper was obtained in the same manner as in Example 1 except that the addition amount was changed to 4 parts.

Example 10 A receiving paper was obtained in the same manner as in Example 2 except that synthetic paper (trade name: FPG-110, manufactured by Oji Yuka Co., Ltd.) was used as the base paper.

Comparative Example 1 Example 1 was repeated except that lecithin as a release agent and calcium stearate as a lubricant were omitted in the preparation of the coating solution for the receiving layer.
A receiving paper was obtained in the same manner as described above.

Comparative Example 2 Receiving paper was prepared in the same manner as in Example 1 except that the amount of lecithin as a release agent was changed to 1 part and calcium stearate as a lubricant was removed in the preparation of the coating solution for the receiving layer. I got

Comparative Example 3 Example 1 was repeated except that the release agent was changed to 15 parts of dioctyl phosphate monoethanolamine and calcium stearate was removed as a lubricant in the preparation of the coating solution for the receptor layer.
A receiving paper was obtained in the same manner as described above.

Comparative Example 4 In the preparation of the coating solution for the receiving layer, the release agent was changed to a stearic acid emulsion (trade name: Nopcocellar LU-6418,
A receiving paper was obtained in the same manner as in Example 1 except that the amount was changed to 5 parts (manufactured by San Nopco Co.) and calcium stearate as a lubricant was removed.

Comparative Example 5 In the preparation of the coating solution for the receiving layer, the release agent was changed to 5 parts of paraffin wax (trade name: Pertol A-30, manufactured by Hyundai Chemical Industry Co., Ltd.), and calcium stearate as a lubricant was removed. Except for the above, a receiving paper was obtained in the same manner as in Example 1.

Comparative Example 6 The procedure of Example 1 was repeated except that the release agent was changed to 3 parts of paraffin wax (trade name: Pertol A-30, manufactured by Hyundai Chemical Industry Co., Ltd.) in the preparation of the coating solution for the receiving layer. To obtain a receiving paper.

Comparative Example 7 In the preparation of the coating solution for the image receiving layer, the pigment was replaced with clay having an average particle diameter of 0.2 μm (trade name: Ultra White 90, except for lecithin as a release agent and calcium stearate as a lubricant).
A receiving paper was obtained in the same manner as in Example 1, except that the amount was changed to 100 parts (manufactured by Engelhard Co.).

Comparative Example 8 In the preparation of the coating solution for the image receiving layer, the pigment was added with an average particle diameter of 15
μm spherical light calcium carbonate (trade name: B1501,
A receiving paper was obtained in the same manner as in Example 1 except that the amount of the release agent lecithin was changed to 100 parts and the amount of the calcium stearate lubricant was removed.

Comparative Example 9 In the preparation of the coating solution for the image receiving layer, the addition amount of lecithin as a releasing agent was changed to 0.5 parts, calcium stearate as a lubricant was removed, and a pigment having a mean particle diameter of 1.3 μm was prepared. Light calcium carbonate (trade name: TP-123, manufactured by Okutama Industry Co., Ltd.)
A receiving paper was obtained in the same manner as in Example 1 except that the amount was changed to 100 parts.

Evaluation method For the receiving papers obtained in each of the above Examples and Comparative Examples,
Each was evaluated by the following method, and the results were shown in Table 1.
And 2. [Static friction coefficient] The coefficient of static friction between the surfaces of the ink receiving layers was 20 ° C-65 according to JIS P8147.
% R. H. Was measured under the following environment.

[Measurement of Falling Length] According to JIS P 8137, the receiving paper was inclined at 45 ° (oblique angle), and 30 μl of a wetting reagent having a surface tension of 32 dyne / cm was dropped on the surface of the ink receiving layer. The falling length (mm) on the surface of the receiving layer was measured.

[Dot Reproducibility of Recorded Image Surface] The obtained receiving paper was converted to a commercially available thermal transfer printer (trade name: MD).
-2000J, manufactured by Alps Electric Co., Ltd.
Full-color image recording was performed in an environment of 65% RH, and the maximum density (black) of each was measured with a Macbeth reflection densitometer (trade name: RD-914, manufactured by Kollmogen). In addition, the recording density was sufficient. Further, regarding dot reproducibility, a halftone dot portion on a recording image surface was converted to a dot analyzer (DA-3000).
, The degree of dot omission and sharpness (without thickening or thinning) can be measured for the recorded image surface
The quality of the recorded image was visually evaluated comprehensively according to the following evaluation criteria. A: Very good with no missing dots, thickening or thinning. ：: Good with almost no missing dots, thickening or thinning. Δ: There is considerable dot omission, thickening or thinning, and slightly inferior. ×: Many dots are missing, thick or thin, and inferior.

[Evaluation of Recorded Image Quality] The recorded image on the receiving paper on which the full-color image recording was performed was visually evaluated for the quality of the recorded image according to the following evaluation criteria. ：: Very clear image with excellent image quality without color shift and unevenness of density. ：: There is almost no color misregistration and shading, and the image quality is good with a clear image. Δ: Color misregistration and shading unevenness were recognized, the image was slightly unclear, and the image quality was slightly inferior. ×: Color shift and unevenness of density are observed, and the image is not clear and the image quality is inferior.

[Evaluation of Stain on Blank Sheet and Recorded Image] Further, (1) 20 ° C.-65% RH and (2) 35 ° C.-3
Under a printing environment of 0% RH, full-color image recording was performed in the same manner as described above, and the degree of contamination was visually evaluated according to the following evaluation criteria. A: Stain is not generated on a blank portion and a recorded image. ：: Slightly inconspicuous stain is observed when continuous printing is performed only on the white paper portion, but there is no problem in practical use. Δ: Stain is partially generated on a blank portion or a recorded image. ×: Stain is generated on almost the entire surface of the blank portion or the recorded image. In the above evaluation criteria, a level of ○ or higher is suitable for practical use, but a level of △ or lower is not suitable for practical use.

[0066]

[Table 1]

[0067]

[Table 2]

[0068]

The receiving paper of the present invention can be used in ordinary environments,
Even in a high-temperature and low-humidity environment, there is no stain on the blank part at the start of printing or the recorded image, and there is no dot thickening on the recorded image surface,
It has excellent dot reproducibility and can obtain extremely clear and high-quality recorded images, especially for full-color recording.
It is of high practical value.

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Claims (4)

[Claims] 1. A fusion-type thermal transfer recording receiving paper having an ink receiving layer containing an adhesive and a pigment as main components on a base paper, wherein the receiving layer contains an aliphatic hydrocarbon group having 6 to 22 carbon atoms. 2. A fusion type thermal transfer recording receiving paper, comprising 2 to 10% by weight, based on the pigment, of a release agent comprising at least one phosphoric acid ester, an amine salt thereof and lecithin. 2. The coefficient of static friction between the surfaces of the ink receiving layers according to JIS P 8147 is 0.20 to 0.45.
The receiving paper for fusion-type thermal transfer recording according to claim 1, wherein 3. The flow down length of the surface of the ink receiving layer is 100 to 17 when measured by dropping 30 μl of a wetting reagent having a surface tension of 32 dyne / cm based on JIS P 8137.
The receiving paper for fusion-type thermal transfer recording according to claim 1, which has a thickness of 0 mm. 4. The receiving paper for fusion-type thermal transfer recording according to claim 1, wherein the pigment is spherical calcium carbonate having an average particle diameter of 1 to 10 μm.