JP2014056121A - Composition for label base material, label base material, label, and manufacturing methods therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition for a label base material, a label base material, a label, and manufacturing methods therefor, which are excellent respectively in film properties such as tensile strength and impact resistance, in film-forming properties such as film softening point temperature, powder characteristics and fixability, and in printability, and do not damage the crusher.SOLUTION: A composition for a white label base material is characterized in that a melted mixture containing a polyester resin including a unit obtained by condensing an aliphatic dicarboxylic acid and aliphatic diol, and a white pigment having a new Mohs hardness of 5 or below is pulverized. A label base material, a label and manufacturing methods therefor are obtained by using the composition for a white label base material.

Description

  The present invention provides a composition for a label base material that is excellent in film properties, suitability for film formation, and printability, and does not damage the pulverizer, a label base material produced using the same, and a label base material The present invention relates to a label manufactured by using the method and a manufacturing method thereof.

  Conventionally, a method for producing a label with a back paste is known. The label can be created by printing a pattern on the label paper that has the adhesive coated on the back side of the release sheet, and then cutting the label paper into an arbitrary shape with a blade. The method to do is generally done.

  There are half cuts that cut only the label paper and the adhesive part, and all cuts that cut the entire release paper, but in any case, the above cutting method uses one type of label. Both a plate for printing the pattern and a blade type that cuts out the label according to the pattern must be prepared.

  This type of label creation method does not interfere with this when creating a large number of labels, but when the number of labels to be created is small, the original printing plate and design are cut. Since the production cost of the blade type is high, there is a problem to be solved that the unit price of the label becomes high as a result.

  On the other hand, the applicant of the present invention first prepares a label in an arbitrary shape in response to a requirement that toner is developed into an arbitrary shape by an electrophotographic method and then heat-treated to prepare a label. The method which enabled this was proposed (for example, refer patent document 1). This method is particularly excellent in that the label can be formed in an arbitrary shape on demand.

In the label produced by such a label production method, in order to improve the characteristic as a label, the improvement of the characteristic of the composition for a label base material which forms a film to be a label base material becomes an important problem.
In the above-mentioned Patent Document 1, a polyvinyl acetal resin is used as the main component of the toner for the label base material. In addition to this, an example in which polylactic acid is used as a constituent resin of a label is also disclosed (for example, see Patent Document 2). Moreover, the example which uses UV curable polyester as constituent resin of a label is also disclosed (for example, refer patent document 3).

In addition, an example is disclosed in which PET (Polyethylene Terephthalate) is used for the label base material and polyester containing polybutylene succinic acid is used for the image receiving layer of the label base material (see, for example, Patent Document 4).
In addition, although not for a label substrate, an example in which polybutylene succinic acid is used as a resin component for toner is disclosed as one capable of forming a toner image with good color reproducibility (for example, patents). Reference 5).

JP 2007-283745 A JP 2011-008047 A JP 2010-184470 A JP 2005-173182 A JP 2011-095342 A

  However, the polyvinyl acetal resin in Patent Document 1 has relatively good properties as a normal toner, but when used as a label base material in the form of a film developed, transferred, and fixed, the film properties are easily broken. It was insufficient as a label substrate.

  In addition, the use of polylactic acid in Patent Document 2 is not sufficient, although the film properties are improved. Further, polylactic acid has a high melting temperature, that is, a softening point, and a problem that a large amount of heat is required for forming a label film remains as a problem to be solved.

  In Patent Document 3, the method of polymerizing when the resin is melted using UV light is effective as a method for increasing the strength of the label film, but requires a separate UV light source and sufficiently increases the strength. Therefore, there is a problem to be solved that the output of UV must be increased.

The technique of Patent Document 4 uses polybutylene succinic acid in the toner image-receiving layer in order to improve the printability when PET is used as the label base material, but PET is used as the label base material. There is no description about the strength of the label film when used.
The technique of Patent Document 5 uses polybutylene succinic acid as a toner for image formation, but not as a toner image receiving layer, but does not describe any idea of producing a label film with toner.

  Styrene / acrylic resins, which are widely used as toner resins, are known. However, films formed using styrene / acrylic resins have extremely poor flexibility and have problems with film properties. Therefore, the applicant of the present application measured the tensile strength of such a film, and as a result, the tensile strength at break (%) was found to be inferior to the film properties due to the extremely small elongation of less than 1%.

On the other hand, white is often used as the color of the label, and in order to efficiently produce a white label, a white pigment such as titanium oxide has been added to the toner serving as the label substrate.
However, since titanium oxide is a hard material, when a toner is prepared by a pulverization method, there is a drawback that the pulverizer is damaged due to its hardness. In particular, the toner used as the base material of the label is generally poorly pulverizable, and freeze pulverization using liquid nitrogen is suitable for the pulverization. However, the freeze pulverizer is difficult to take measures to grind hard materials due to its characteristics. , Especially susceptible to damage.

  The present invention solves the above-mentioned conventional problems in film properties such as tensile strength and impact resistance, film-forming softening point temperature and powder properties and fixability such as fixability, and printability. It aims at providing the composition for label base materials which is excellent and does not damage a grinder, a label base material, a label, and the manufacturing method thereof.

  In order to solve the above problems, a first aspect of the present invention is a melt kneading comprising a polyester resin containing a unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol, and a white pigment having a new Mohs hardness of 5 or less. Provided is a white label base material composition obtained by pulverizing a product.

In the composition for a white label base material configured as described above, as the white pigment, at least one selected from the group consisting of talc, kaolin, zinc sulfide, barium sulfate, calcium carbonate, and zinc oxide is used. it can.
Further, the aliphatic dicarboxylic acid can be succinic acid, and the aliphatic diol can be 1,4-butanediol.

  According to a second aspect of the present invention, there is provided a step of melt-kneading a polyester resin containing a unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol and a white pigment having a new Mohs hardness of 5 or less, and obtaining There is provided a method for producing a composition for a white label substrate, comprising a step of pulverizing the obtained melt-kneaded product.

In the third aspect of the present invention, the white label substrate composition according to the first aspect is developed as a solid image having a label shape, transferred to the adhesive-coated surface of the release paper, and fixed. A white label base material is provided.
In a fourth aspect of the present invention, the white label base composition according to the first aspect is developed as a label-shaped solid image, and the developed solid image is transferred to the adhesive-coated surface of the release paper. There is provided a method for producing a white label substrate, comprising: a step; and a step of fixing the transferred solid image to the adhesive-coated surface of the release paper in a film form by heating and pressing.

According to a fifth aspect of the present invention, there is provided a label formed by transferring and fixing a developed desired toner image on the white label base material according to the third aspect.
A sixth aspect of the present invention includes a step of developing a desired toner image, a step of transferring the toner image onto the white label base material according to the third aspect, and the transferred toner image as the white color. Provided is a method for producing a label, comprising a step of fixing on a label substrate by heating and pressing.

  According to the present invention, it is excellent in film properties such as tensile strength and impact resistance, film-forming softening point temperature, powder properties and fixability such as fixability, and printability, and damages the grinder. There are provided a composition for a label substrate, a label substrate, a label, and a production method thereof.

It is sectional drawing which shows the structure of the image forming apparatus as a label production apparatus for producing the label which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, “printing” and “printing” are used as synonyms.
A composition for a white label substrate according to an embodiment of the present invention is a melt kneading comprising a polyester resin containing a unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol, and a white pigment having a new Mohs hardness of 5 or less. It is characterized by being pulverized.

  According to the knowledge of the present inventors, as a resin constituting the composition for the white label substrate, as a result of examining various materials, polybutylene succinic acid, which is a copolymer of succinic acid and 1,4-butanediol, was obtained. By using polyester resin as the main component, the film properties of the formed film are improved, and the softening point at the time of fixing to the label mount is at a level that is practically acceptable, and printing with color toner after fixing, etc. There was a significant improvement in aptitude.

Moreover, when a white toner for label production is prepared by a pulverization method by blending such a polyester resin with a white pigment having a new Mohs hardness of 5 or less, particularly 1 to 5, the pulverizer is damaged. An excellent effect of not giving is obtained.
In general, white is often used as the label color, and in order to produce a white label efficiently, the toner used as the label base material contains a white pigment. Titanium oxide (rutile), which is most commonly used as a white pigment, is used. The mold) has a high new Mohs hardness of 8 to 8.5 and is a hard material. Therefore, when a toner is produced by a pulverization method, there is a drawback that the pulverizer is damaged due to its hardness. The toner used as the base material of the label is generally poorly pulverized, and freeze pulverization using liquid nitrogen is suitable for the pulverization. However, the freeze pulverizer is difficult to take measures against pulverizing hard materials due to its characteristics. Easy to take damage.

In this embodiment, since a low white pigment having a new Mohs hardness of 5 or less is used, when a white toner for label production is prepared by a pulverization method, the pulverizer is not damaged.
Examples of the white pigment having a new Mohs hardness of 5 or less include at least one selected from the group consisting of talc, kaolin, zinc sulfide, barium sulfate, calcium carbonate, and zinc oxide.

Talc refers to phyllosilicate, also called talc. Kaolin is a clay mainly composed of kaolin minerals such as kaolinite.
It is preferable that content of a white pigment is 5-60 mass% with respect to the composition for white label base materials. If it is 5 mass% or less, it is difficult to obtain a white appearance, and if it exceeds 60 mass%, the physical strength as a film tends to deteriorate.

  In the composition for a white label substrate according to the present embodiment, the polyester resin as the resin component is a single monomer unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol as represented by the following formula (1). Can be included.

また、樹脂成分であるポリエステル樹脂は、下記式（２）により表されるような複数種のユニットの共重合体を含むものとすることができる。

Moreover, the polyester resin which is a resin component shall contain the copolymer of the multiple types of unit as represented by following formula (2).

この場合、上記ラベル基材用組成物によりフィルム状のサンプルを作成し、ＪＩＳ Ｋ７１１３に準じた引張試験を行った際の引張破壊伸び（％）が、５０〜４５０％であることが好ましい。
また、上記ラベル基材用組成物の軟化点が１４０℃以下であることが好ましい。

In this case, it is preferable that a tensile elongation at break (%) is 50 to 450% when a film-like sample is prepared from the label base material composition and a tensile test according to JIS K7113 is performed.
Moreover, it is preferable that the softening point of the said composition for label base materials is 140 degrees C or less.

  The label base composition described above is a step of melt-kneading a polyester resin containing a unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol, and a white pigment having a new Mohs hardness of 5 or less, And it can manufacture by the process of grind | pulverizing the obtained melt-kneaded material.

  The pulverization of the melt-kneaded product is preferably performed at a low temperature, particularly freeze pulverization. Freeze crushing means that even an elastic body such as rubber has a property (low temperature brittleness) that becomes extremely brittle against impact when cooled below the embrittlement point. In this method, pulverization is performed while suppressing heat generation and preventing thermal denaturation.

The pulverization temperature in the present embodiment is preferably Tg or less of the sample to be pulverized, and -50 ° C. or less in the present study.
An example of a freeze pulverizer that performs freeze pulverization is Linlex Mill (manufactured by Hosokawa Micron Corporation).
The step of developing the white label substrate composition produced as described above as a solid image of a label shape, the step of transferring the developed solid image to the adhesive-coated surface of a release paper, and the transferred solid A white label substrate made of a solid image of the composition for a label substrate can be produced by fixing the image on the pressure-sensitive adhesive-coated surface of the release paper in the form of a film by heating and pressing.

  The release paper has an adhesive layer on one side. For example, after applying a spray type adhesive “55” manufactured by 3M Co., Ltd. on one side of the paper, the surface of the adhesive layer It can be obtained by applying an aqueous dispersion of polyethylene vinyl acetate resin to water and drying the water. In addition to paper, metal, wood, resin, ceramics, etc. can be used.

Further, a label can be manufactured by transferring a desired developed toner image onto the white label substrate thus manufactured and fixing it by heating and pressing.
An apparatus for creating a label substrate and forming a label by forming a normal toner image on the label substrate will be described below with reference to FIG.

As shown in FIG. 1, the image forming apparatus 1 includes an image forming unit 2, a re-transport unit 3, and a paper feeding unit 4. The image forming unit 2 has a configuration in which five image forming units 5 (5-1, 5-2, 5-3, 5-4, 5-5) are arranged in a multistage manner.
Of the five image forming units 5, three image forming units 5-1, 5-2, and 5-3 on the upstream side in the sheet conveying direction (right side in the drawing) are magenta (M ), Cyan (C), and yellow (Y) color toners are formed.

  The fourth image forming unit 5-4 following the three image forming units 5-1, 5-2, 5-3 forms a black (K) monochrome image. These four color toner images are overlaid on the surface of the release paper, which will be described later, coated with an adhesive layer (hereinafter referred to as the adhesive layer surface) to form a full-color image.

  Further, among the five image forming units 5, the image forming unit 5-5 on the most downstream side (left end in the figure) in the sheet conveying direction is an image formed by a label base material composition to be described later (here, a photosensitive material described later). The image developed on the body drum is referred to as an image regardless of the shape).

Each of the image forming units 5-1 to 5-5 has the same configuration except for the color and type of the developer stored in the developing unit. Therefore, hereinafter, the configuration of the image forming unit 5-4 will be described as an example.
The image forming unit 5 is assembled to the photosensitive drum 6, the cleaner 7 disposed along the circumferential surface of the photosensitive drum 6, the charging roller 8, the developing unit 9, and the opening on the lower side surface of the developing unit 9. The developing roller 11 is provided.

  An optical writing head 12 on the main unit side is disposed in the vicinity of the upper surface located between the charging roller 8 of the photosensitive drum 6 and the developing unit 9. Further, a transport belt 13 is disposed in the vicinity of the lower surface of the photosensitive drum 6. The transfer device 14 is pressed toward the lower surface of the photosensitive drum 6 with the conveying belt 13 interposed therebetween.

  The conveyor belt 13 is made of a conductive sheet-like member made of resin containing conductive carbon or an ion conductive material, is stretched over the drive roller 15 and the driven roller 16 and is driven by the drive roller 15, and the arrow in the figure. Circulately moves in the counterclockwise direction indicated by a, b and c. The photosensitive drum 6 rotates in the clockwise direction in the figure. First, by applying charge from the charging roller 8, the peripheral surface of the photosensitive drum 6 is uniformly charged and initialized. Next, an electrostatic latent image is formed on the peripheral surface of the photosensitive drum 6 by optical writing from the optical writing head 12 based on the print information.

  The electrostatic latent image is converted into a toner image (development) by the toner stored in the developing unit 9 by the developing process by the developing roller 11. The toner image developed on the peripheral surface of the photosensitive drum 6 is rotated and conveyed to a transfer portion where the photosensitive drum 6 and the transfer device 14 face each other as the photosensitive drum 6 rotates.

  On the other hand, a large number of cut paper-like release papers 18 are accommodated in the paper feed cassette 17 of the paper feed unit 4 with the surface coated with the adhesive layer facing downward. The release paper 18 is carried out from the paper feed cassette 17 one by one by one rotation of the paper feed roller 19, and is fed to the standby roller pair 22 through the transport guide path 21.

Alternatively, when a small number of labels are produced, the release paper 18 is fed from the MPF tray 24 mounted on the opened mounting portion 23 to the standby roller pair 22 by the paper feed roller 25.
The standby roller pair 22 is placed on the conveying belt 13 at a timing when the toner image printing position on the adhesive layer surface of the release paper 18 coincides with the front end of the toner image on the photosensitive drum 6 of the image forming unit 5-5 at the most downstream in the paper conveying direction. To feed.

The release paper 18 is electrostatically attracted and transported to the upper surface of the transport belt 13 that circulates, and moves with the transport belt 13 directly below the photosensitive drum 6 from the upstream side to the downstream side in the paper transport direction.
At this time, the conveyance belt 13 is separated downward from the image forming units 5-1 to 5-4. Then, the image forming unit 5-5 responsible for printing the toner image on the adhesive layer surface is lowered from the upper retracted position, and the photosensitive drum 6 comes into contact with the transport belt 13.

Then, the release paper 18 is transferred with an image of the label base material composition (hereinafter also referred to as toner for convenience) to the pressure-sensitive adhesive layer surface in the transfer portion of the image forming unit 5-5. In addition, the image by the composition for label base materials formed in this adhesive layer surface is a solid print image.
The release paper 18 thus transferred with the solid image of the label base material composition on the pressure-sensitive adhesive layer surface is carried into the fixing unit 26. The fixing unit 26 includes a heat roller 26a, a pressure roller 26b, and a cleaner 26c.

  While the release paper 18 is nipped and conveyed by the heat roller 26a and the pressure roller 26b, the solid image of the composition for the label base material is melted by heat and pressure, and is pressed and fixed to the pressure-sensitive adhesive layer surface. . The cleaner 26c removes the toner remaining on the heat roller 26a.

  In this way, in the release paper 18 in which the solid image of the label base material composition is fixed on the pressure-sensitive adhesive layer surface by the fixing unit 26, the switching plate 27 rotates upwardly as indicated by the solid line in the figure around the fulcrum 28. By being, it is sent to the re-transport unit 3. Further, when the switching plate 27 is pivoted downward about the fulcrum 28 as indicated by a broken line in the figure, the switching plate 27 is conveyed upward by the conveying roller 29 and is discharged to the paper discharge unit 32 by the paper discharge roller 31.

The re-conveying unit 3 has a plurality of conveying rollers 33a to 33e disposed therein. The re-conveyance unit 3 returns the paper to the conveyance guide path 21 so that it can be overprinted by temporarily stopping the conveyance of the paper and conveying by the plurality of conveyance rollers 33a to 33e.
In this example, the release paper 18 on which the solid image of the toner for the label base material is fixed is rotated not only by the label base material but also by the switching plate 27 upwardly as indicated by the solid line in the figure. By being moved, it is sent to the re-transport unit 3 as it is.

The standby roller pair 22 returns the released release paper 18 so that the printing start position on the surface of the adhesive layer coincides with the front end of the toner image on the photosensitive drum 6 of the image forming unit 5-1 at the most upstream in the paper transport direction. The sheet is fed onto the conveyor belt 13 at the timing.
The release paper 18 is transferred with the toner image of the first color by the transfer unit of the image forming unit 5-1, and the toner image of the next color is transferred by the transfer unit of the image forming unit 5-2. The third toner image is transferred by the transfer unit 5-3, and the black toner image is transferred by the transfer unit of the image forming unit 5-4.

In the printing process in the full color printing mode in this example, the image forming units 5-1 to 5-4 are set to the printing state, and the image forming unit 5-5 is moved upward from the contact position with the conveyance belt 13. Move away from.
The release paper 18 on which the four color toner images are superimposed and transferred onto the solid image of the label base material composition formed and fixed on the adhesive layer as described above is carried into the fixing unit 26. . The fixing unit 26 fixes the four color toner images on the solid image of the label base material composition by the heat roller 26a and the pressure roller 26b, and discharges them downstream.

The release paper 18 discharged from the fixing unit 26 is transported upward by the transport roller 29 because the switching plate 27 is rotated to a lower position indicated by a broken line, and the image forming surface is lowered by the paper discharge roller 31. The paper is discharged to the paper discharge unit 32.
As described above, the production of the label base material on the pressure-sensitive adhesive layer of the release paper using the composition for a label base material according to one embodiment of the present invention, and the full color label image with the normal toner on the label base material As a result, a label with release paper is completed.

EXAMPLES Hereinafter, the Example and comparative example of this invention are shown and this invention is demonstrated concretely.
<Measurement method of each physical property value>
The measuring method of the physical property value used in each example is shown below.
<Measurement of softening point>
For measurement of the softening point, the apparatus is a flow tester (manufactured by Shimadzu Corporation, CFT-500D), the sample is 1 g, the heating rate is 6 ° C./min, the load is 20 kg, the nozzle is 1 mm in diameter, 1 mm in length, The softening point was 1/2 method (temperature at which half of the sample was discharged).
<Measurement of particle size>
To measure the particle size of the toner (the composition for the label base material), the apparatus is FPIA-2100 (manufactured by Sysmex Corporation), the sample is placed in a beaker with a small amount of sample, purified water, and a surfactant, and is placed in an ultrasonic cleaner. And dispersed. As a measurement result, a volume average particle size (D50) was obtained.
<Synthesis of polybutylene succinic acid as a main component of the composition for label substrate>
As a synthesis example, 5 parts by mass of 88% lactic acid aqueous solution in which 0.4 part by mass of malic acid and 1 part by mass of germanium dioxide were dissolved was added to 100 parts by mass of succinic acid and 89 parts by mass of 1,4-butanediol. . After making the inside of a reaction system into nitrogen atmosphere, it was made to react at 220 degreeC for 1 hour, and it was pressure-reduced to 70 Pa over 1.5 hours then heating up at 230 degreeC. Polymerization was further allowed to proceed for 2 hours to obtain polybutylene succinic acid.
<Manufacture of white toner>
Example 1
81.5 parts by mass of polybutylene succinic acid obtained in Synthesis Example, 15 parts by mass of talc (SG-2000; manufactured by Nippon Talc Co., Ltd.), 1 mass of LR-147 (manufactured by Nippon Carlit Co., Ltd.) as a charge control agent And 2.5 parts by mass of Carnauba wax (manufactured by Kato Yoko Co., Ltd.) were mixed, and the mixture was kneaded with a biaxial extrusion kneader.

The obtained kneaded product was pulverized under liquid nitrogen by a low-temperature pulverizer (Linlex Mill; manufactured by Hosokawa Micron Corporation) to obtain a powder having a D50 (volume) of 37 μm.
Stirring with a Henschel mixer together with 0.2 parts by mass of two types of silica particles RY200 (manufactured by Nippon Aerosil Co., Ltd.) and 0.7 parts by mass of NY50 (manufactured by Nippon Aerosil Co., Ltd.), wherein 100 parts by mass of this powder were hydrophobized Thus, Toner 1 having silica particles added thereto was obtained. The toner 1 had a D50 (volume) of 33 μm and a softening point of 126 ° C.

Example 2
Toner 2 was obtained in the same procedure as in Example 1 except that 15 parts by mass of kaolin (ASP072; Hayashi Kasei Co., Ltd.) was used instead of 15 parts by mass of talc. The toner 2 had a D50 (volume) of 39 μm and a softening point of 126 ° C.
Example 3
Toner 3 was obtained in the same procedure as in Example 1 except that 15 parts by mass of zinc sulfide fine particles were used instead of 15 parts by mass of talc. The toner 3 had a D50 (volume) of 39 μm and a softening point of 126 ° C.

The zinc sulfide fine particles were produced by the following method. 100 parts by mass of zinc sulfide (Sachtolish L; manufactured by Zachtreben Co., Ltd.) was mixed with 800 parts by mass of ion-exchanged water and 500 parts by mass of 100 μm-diameter alumina beads, and stirred for 10 hours in a ball mill.
Next, after the alumina beads were removed from the mixed solution through a sieve having an opening of 50 μm, the precipitate was collected and dried to obtain zinc sulfide fine particles having a D50 (volume) of 0.4 μm.

Example 4
Toner 4 was obtained in the same manner as in Example 1, except that 15 parts by mass of barium sulfate (B-30; manufactured by Sakai Chemical Industry Co., Ltd.) was used instead of 15 parts by mass of talc. The toner 4 had a D50 (volume) of 39 μm and a softening point of 126 ° C.
Example 5
Toner 5 was obtained in the same procedure as in Example 1 except that 15 parts by mass of calcium carbonate (Imeris Mineral Co., Ltd.) having a D50 of 0.4 μm was used instead of 15 parts by mass of talc. This toner 5 had a D50 (volume) of 40 μm and a softening point of 126 ° C.

Example 6
Toner 6 was obtained in the same procedure as in Example 1 except that 15 parts by mass of zinc oxide (Hisui Tech Co., Ltd.) was used instead of 15 parts by mass of talc. The toner 6 had a D50 (volume) of 38 μm and a softening point of 126 ° C.
Comparative Example 1
Toner 7 was obtained in the same procedure as in Example 1 except that 15 parts by mass of zirconium oxide was used instead of 15 parts by mass of talc. The toner 7 had a D50 (volume) of 33 μm and a softening point of 126 ° C.

In addition, as zirconium oxide, what pulverized UEP made from a 1st rare element chemical industry Co., Ltd. to the particle size of 0.3 micrometer with the bead mill was used.
Comparative Example 2
Toner 8 was obtained by the same procedure as in Example 1 except that 15 parts by mass of titanium oxide (CR-60; manufactured by Ishihara Sangyo Co., Ltd.) was used instead of 15 parts by mass of talc. This toner 8 had a D50 (volume) of 33 μm and a softening point of 126 ° C.

  In the production of the toners 1 to 8 in Examples 1 to 6 and Comparative Examples 1 and 2 above, the results of examining the damage of the low-temperature pulverizer used are shown below together with the Mohs hardness, new Mohs hardness and refractive index of the white pigment. Shown in the table.

上記表１に示すように、新モース硬度が５以下である白色顔料を用いてトナー１〜６を得た実施例１〜６では、いずれも粉砕機のダメージは認められなかった。これに対し、新モース硬度が１１である酸化ジルコニウムを用いた比較例１、及び新モース硬度が８〜８．５である酸化チタンを用いた比較例２では、いずれも粉砕機のダメージが認められ、その使用は困難であった。

As shown in Table 1 above, in Examples 1 to 6 where toners 1 to 6 were obtained using a white pigment having a new Mohs hardness of 5 or less, no damage to the pulverizer was observed. In contrast, in Comparative Example 1 using zirconium oxide having a new Mohs hardness of 11 and Comparative Example 2 using titanium oxide having a new Mohs hardness of 8 to 8.5, damage to the grinder was recognized. And its use was difficult.

  In the above examples, 1, butanediol is used in the synthesis of polybutylene succinic acid as a polyester resin constituting the composition for a label substrate, but in addition to 1,4-butanediol, ethylene glycol, 1,3-propanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1 , 12-dodecanediol, etc. may be used.

  Further, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2,5-hexanediol, 1,2-propanediol, 1,2-butanediol, 1, Branched diols such as 3-butanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, and 1,4-cyclohexanedimethanol are also considered effective. It is also possible to use a plurality of these.

  It is also possible to polymerize an aliphatic dicarboxylic acid different from succinic acid or to copolymerize a plurality of dicarboxylic acids. The following can be considered as the aliphatic dicarboxylic acid. That is, oxalic acid, malonic acid, glutaric acid, adipic acid, suberic acid, sebacic acid, cyclohexanedicarboxylic acid, fumaric acid, maleic acid. Moreover, even if it is aromatic dicarboxylic acid, it can be used by copolymerizing with aliphatic dicarboxylic acid. For example, the following aromatic dicarboxylic acids can be considered. That is, phthalic acid, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid and the like.

Although several embodiments of the present invention have been described, the present invention is included in the invention described in the claims and the equivalents thereof. Hereinafter, the invention described in the scope of claims of the present application will be appended.
[Appendix 1]
A composition for a white label substrate, comprising a polyester resin containing a unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol, and a melt-kneaded product containing a white pigment having a new Mohs hardness of 5 or less. object.
[Appendix 2]
The composition for a white label substrate according to claim 1, wherein the white pigment is at least one selected from the group consisting of talc, kaolin, zinc sulfide, barium sulfate, calcium carbonate, and zinc oxide.
[Appendix 3]
The composition for a label base material according to appendix 1, wherein the aliphatic dicarboxylic acid is succinic acid and the aliphatic diol is 1,4-butanediol.
[Appendix 4]
A step of melt-kneading a polyester resin containing a unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol, and a white pigment having a new Mohs hardness of 5 or less, and a step of pulverizing the obtained melt-kneaded product The manufacturing method of the composition for white label base materials characterized by comprising.
[Appendix 5]
The white label, wherein the composition for a white label substrate according to any one of appendices 1 to 3 is developed as a solid image having a label shape, transferred to an adhesive-coated surface of a release paper, and fixed. Base material.
[Appendix 6]
The step of developing the white label substrate composition according to any one of appendices 1 to 3 as a solid image having a label shape, the step of transferring the developed solid image to the adhesive-coated surface of the release paper, and the transfer A method for producing a white label substrate, comprising the step of fixing the solid image to a film form by heating and pressing on the pressure-sensitive adhesive application surface of the release paper.
[Appendix 7]
A label obtained by transferring a developed desired toner image onto a white label base material described in Appendix 5 and fixing the toner image.
[Appendix 8]
A step of developing a desired toner image, a step of transferring the toner image onto the white label base material according to appendix 5, and a step of heating and pressurizing the transferred toner image onto the white label base material A method for producing a label, comprising a fixing step.

  The present invention is excellent in film properties such as tensile strength and impact resistance, film-forming softening point temperature, powder properties and fixability such as fixability, and printability, and damages the grinder. It can utilize for the composition for label base materials which does not have, a label base material, a label, and those manufacturing methods.

1. Image forming apparatus
2. Image forming unit
3 ... Re-transfer unit
4 ... Paper feed section
5 (5-1, 5-2, 5-3, 5-4, 5-5) ... Image forming unit
6 ... Photosensitive drum
7 ... Cleaner
8, 8a, 8b ... charging roller
9 ... Developing unit
11 ... Developing roller
12 ... Optical writing head
13 ... Conveyor belt
14 ... Transfer
14 '... transfer roller
15 ... Driving roller
16 ... driven roller
17 ... Paper cassette
18 ... Releasable sheet (paper)
19 ... Paper feed roller
21 ... Conveyance guideway
22: Waiting roller pair
23 ... Wearing part
24 ... MPF (Multi Paper Feeder) tray
25 ... Paper feed roller
26. Fixing unit
26a ... Heat roller
26b ... Pressing roller
26c ... cleaner
27 ... Switching plate
28 ... fulcrum
29 ... Conveying roller
31: Paper discharge roller
32: A paper discharge unit.

In order to solve the above problems, a first aspect of the present invention is a melt kneading comprising a polyester resin containing a unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol, and a white pigment having a new Mohs hardness of 5 or less. A white label substrate composition is provided, wherein the product is freeze- pulverized at a low temperature not higher than the glass transition temperature and not higher than −50 ° C. of the melt-kneaded product .

According to a second aspect of the present invention, there is provided a step of melt-kneading a polyester resin containing a unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol and a white pigment having a new Mohs hardness of 5 or less, and obtaining There is provided a method for producing a composition for a white label substrate, comprising a step of freeze- pulverizing the obtained melt-kneaded product at a low temperature not higher than the glass transition temperature of the melt-kneaded product and not higher than -50 ° C. .

Claims (8)

  A composition for a white label substrate, comprising a polyester resin containing a unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol, and a melt-kneaded product containing a white pigment having a new Mohs hardness of 5 or less. object.   The composition for a white label substrate according to claim 1, wherein the white pigment is at least one selected from the group consisting of talc, kaolin, zinc sulfide, barium sulfate, calcium carbonate, and zinc oxide.   The composition for a label substrate according to claim 1, wherein the aliphatic dicarboxylic acid is succinic acid, and the aliphatic diol is 1,4-butanediol. A step of melt-kneading a polyester resin containing a unit obtained by condensing an aliphatic dicarboxylic acid and an aliphatic diol and a white pigment having a new Mohs hardness of 5 or less, and a step of pulverizing the obtained melt-kneaded product The manufacturing method of the composition for white label base materials characterized by comprising.   The white label substrate composition according to any one of claims 1 to 3, which is developed as a solid image having a label shape, transferred to a pressure-sensitive adhesive-coated surface of a release paper, and fixed. Label substrate. The step of developing the white label substrate composition according to any one of claims 1 to 3 as a label-shaped solid image,
A step of transferring the developed solid image to an adhesive-coated surface of a release paper, and a step of fixing the transferred solid image to the adhesive-coated surface of the release paper in a film form by heating and pressing. A method for producing a white label base material.   A label obtained by transferring and fixing a developed developed toner image on the white label base material according to claim 5. Developing a desired toner image;
Transferring the toner image onto the white label base material according to claim 5, and fixing the transferred toner image onto the white label base material by heating and pressing. A manufacturing method of a characteristic label.

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