KR100230619B1 - Recording film for colour ink-jet printer - Google Patents

Abstract

An orange peel remover composed of a transparent base film, a polyvinylpyrrolidone and / or a polyacrylate, a silica gel or alumina having an average particle diameter of 5 to 30 nm dispersed in a solvent, and a linear polymer connected to an alkyl group An ink jet printer film composed of a protective layer coated by adding a small amount of inorganic materials such as methyl cellulose or gelatin, silica gel or alumina on the ink receiving layer formed by coating the composition of the mixed ink receiving layer, has a high ink drying speed. It increases the size, reduces the haze and prevents the adhesion of impurities. The appearance is beautiful and the color development, water resistance, chemical resistance, and transparency are superior to those of conventional products.

Description

Film for color inkjet printer

Industrial use field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film for color inkjet printers used in color ink-jet printers, and more particularly, an ink receptive layer capable of containing a base film and ink. orange peel remover consisting of linear polymer connected with alkyl group to ink receiving layer of color inkjet printer film composed of protective layer (top coat), base coat and ink receiving layer. The present invention relates to a film for color inkjet printers having excellent color development, water resistance, chemical resistance, transparency, and adhesiveness as well as the ink's characteristic color and ink's capacity, drying capacity, and adhesion to pigments by including inorganic substances. .

Prior art

The demand for films for inkjet printers is increasing as slide projectors are replaced by overhead projectors (OHP). In general, the ink used in the inkjet printer to display the color is a pigment (pigment) or dye (dye), the solvent or dispersion medium is mainly used a multihydroxy alcohol (multihydroxy alcohol). It may also be used, including various additives.

As shown in FIG. 1, a conventional inkjet printer film has a base film (base film) 1 and an ink receiving layer 3 formed on the base film 1 as a basic structure. The ink receiving layer 3 is a layer on which ink is absorbed and received to form a basis of coloring.

In the above structure, the base film 1 is made of a hydrophobic transparent material. In general, it is possible to use a variety of films such as polyester (polyester, PET), polyethylene (polyethylene), polypropylene (polypropylene), and should possess transparency due to the nature of the function. In addition, when the thickness of the transparent film used is thinner or thicker, such as 80 to 125 μm, it is not suitable for an inkjet printer.

The ink receiving layer 3 is a pigment that absorbs ink by using polyvinyl alcohol (PVA) and polyvinylpyrrolidone as binder polymers and dispersing inorganic particles of various sizes in the binder polymer. Apply.

In the film for color inkjet printers described above, the general properties required for the ink receiving layer are as follows.

① Water solubility, dryness of ink, fast absorbency, fixability

② transparency

③ When the inkjet film is preserved in the laminated state, the water-soluble capacity should not be reduced because the surface of the receiving layer and the back layer are in close contact with each other.

④ The image should be clear and discolored.

⑤ No sticking, no dust or fingerprints left.

In order to satisfy the above conditions, the ink-drying layer was coated with a water-soluble resin to improve ink dryness, but it was not suitable for high-speed printing, but also had a high hygroscopicity and poor water resistance. Absorbency also fell.

In addition, Japanese Patent Laid-Open No. 7-81213 designed an aqueous layer containing an inorganic material having a size of 300 nm or less and made of a water-soluble resin having a pH of 5 or less in order to increase the dryness of the film for an existing inkjet printer. In this case, colloidal silica or alumina sol was used as the inorganic substance, and polyacrylic acid copolymer or polyvinyl alcohol was used as the water-soluble resin. Such a structure may increase color development ability or dryness, but has a disadvantage in that the overall water resistance is insufficient, and the decrease in surface hardness caused by the increase of the inorganic content is large. In addition, since the water-soluble layer composed of polyvinyl alcohol or polyacrylic acid copolymer is in direct contact with the ink, the printing state is very poor, and in particular, there is a critical disadvantage in that the black image is broken.

In Japanese Patent Application Laid-Open No. 57-14091, an ink jet printer film including a porous layer using 60% or more of organic fine particles as an ink receiving layer was designed. However, since the film lacks transparency and uses a hydrophobic resin, there is a problem in that ink absorption performance is somewhat lowered.

In addition, Japanese Patent No. 61-19389 discloses an inkjet printer film by adding colloidal silica having a particle size of 8 to 30 nm to water-soluble neutral resin made of polyvinyl alcohol and gelatin. When the colloidal silica is completely dispersed, the surface state is not only smooth due to the affinity with the binder, but also the capacity of the ink is excellent because of the large surface area, but anionic dye is used. Fixability and dryness were insufficient.

In addition, Japanese Patent Laid-Open No. 7-25133 discloses an inkjet printer film having an ink receiving layer on a surface of a polyester film of an inkjet film excellent in high gloss, transparency, clarity, etc. as a support, the average particle diameter of the receiving layer It is designed to contain 5 to 30 mg / m 2 of spherical fine particles of 5 to 15 µm and the thickness of the receiving layer is smaller than the average particle size of the spherical fine particles. However, there are disadvantages in that water resistance and chemical resistance are poor.

Solving the above problems to some extent, the constituent components of the aqueous layer currently used are polyacrylates, which are polymerized polymers of acrylate, which serve as binders, and polymers, which are polymers of vinylpyrrolidone, and vinylpyrrolidone. Vinylpyrrolidone is used alone or in combination, and one of the essential components of the water-receiving layer uses an ink-receiving material composed of inorganic substances such as silica gel and alumina. When the ink-receiving layer is composed of such a mixture with a thickness of 3 to 20 µm, a slight difference occurs in the characteristics of the product depending on each state. However, the overall physical properties are equivalent to those of the conventional products. However, before the ink-receiving material is dried, leveling occurs, thereby causing a haze phenomenon and adhesion of impurities such as fingerprints.

On the other hand, in the film for color inkjet printers, the protective layer 5 is further included on the ink receiving layer 3 as needed. The protective layer 5 is applied on the ink receiving layer 3 to protect the ink receiving layer 3, accelerates the dispersion and drying of the ink, and at the same time, provides excellent color images including black. It plays a role in making it manifest.

The protective layer 5 in the color inkjet printer film described above is used in a color inkjet printer using a black ink as a pigment to improve adhesion to the black pigment. By using methylcellulose or gelatin, which is harmless to human body, with similar properties such as acidity (pH), it has not only increased water resistance and chemical resistance but also excellent adhesion to pigments, dyes and solvents. It is easy to penetrate and pass through, so the absorption of ink is very fast and the drying property is increased, which gives the inkjet printer excellent printing performance, but it does not provide adequate drying property for continuous printing.

The present invention has been made to solve the above problems of the prior art, the object of the present invention is firstly excellent conditions of color inkjet printer film such as color development, water resistance, chemical resistance, transparency, etc. Second, ink acceptance capacity, It is to provide a film for a color inkjet printer that can be applied to continuous printing with improved drying ability, adhesion to pigment and printability.

1 is a cross-sectional view schematically showing the structure of a film for a color inkjet printer according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: base film 3: ink receiving layer

5: protective layer

The present invention is the same as the following configuration in order to achieve the above object of the present invention.

In the present invention, the transparent base film and the polyvinylpyrrolidone and / or polyacrylate (polyacrylate) on the base film, silica gel or alumina having an average particle size of 5 ~ 30nm dispersed in a solvent and an alkyl group An ink receiving layer formed by coating with a composition of an ink receiving layer comprising an orange peel remover consisting of linear polymers connected to the protective layer formed by coating with a protective layer composition containing methyl cellulose or gelatin and inorganic on the ink receiving layer It provides a film for color inkjet printer.

In the present invention, the inorganic material is preferably silica gel or alumina having an average particle diameter of 5 to 30 μm, and the orange peel remover is preferably 1 to 10 wt%.

It is preferable that the thickness of said ink receiving layer is 5-15 micrometers.

It is preferable that the said polyacrylate is 5-70 weight%, the said polyvinylpyrrolidone is 10-80 weight%, and the said silica gel or alumina is 5-80 weight%.

It is preferable that the thickness of said protective layer is 1-3 micrometers.

1 shows the structure of an inkjet film according to the present invention. From this structure, the ink receiving layer 3 is protected from the protective layer 5, so that the water resistance and chemical resistance are enhanced, and the absorbed ink is protected by the protective layer in the ink receiving layer, thereby achieving excellent color development. Even when the component of the ink is a pigment, excellent color development is exhibited by the inorganic material of the protective layer.

In the present invention, by adding an orange peel remover composed of a linear polymer connected to an alkyl group to the existing protective layer to solve the coating problem (coating trouble) such as orange peel. In addition, by adding a small amount of inorganic material to the protective layer of the present invention is designed to further improve the adhesion ability with the ink, the ink is dried very quickly by the inorganic material has excellent drying properties. The inorganic substance used at this time is silica gel or alumina, and the size thereof is preferably in the range of 10 to 30 µm. If the size is less than 10 μm, there is no effect on drying, and if the size is more than 30 μm, it is unsuitable for use because it impairs the beauty of aesthetics.

The inkjet film coated with such a component is excellent in dryness, water resistance, chemical resistance, color development, and adhesion.

The following presents a preferred embodiment to aid the understanding of the present invention. However, the following examples are merely provided to more easily understand the present invention, and the present invention is not limited to the following examples.

EXAMPLE

Example 1

The coating liquid of following Table 1 and the composition was apply | coated to one side of the film using the transparent polyester film which has a thickness of 100 micrometers as a base film. At the time of application, a protective layer was applied so as to be 4 g / m 2 after the application of an ink receiving layer having a solid content of 15 g / m 2 using a Meyerbar coater. PVP K-90 (ISP) and PVA 217 (Kuraray) were used as binder resin lattice, Surcol 836 (Allied Colloid) as binder resin, and Surcol 443 (Allied Colloid) as orange peel remover were used. In addition, silica Aerosil 200 (Degussa) was used as the inorganic particles, and the average particle diameter thereof was 12 to 16 nm. Among the components of the coating liquid for the surface layer, methyl cellulose was used as SM25 (Shin-Etsu), and silica gel WP2 (Crosfield) was used as the inorganic particle, and its average particle diameter was 15 μm.

TABLE 1

Example 2

Except that the composition of the coating solution in Example 1 as shown in Table 2 was carried out in the same manner as in Example 1. PVP K-90 (ISP) PVA 217 (Kuraray) was used as the binder resin lattice, Surcol 836 (Allied Colloid) as the binder resin, and Surcol 443 (Allied Colloid) as the orange peel remover were used. In addition, silica Aerosil 200 (Degussa) was used as the inorganic particles, and the average particle diameter thereof was 12 to 16 nm. Among the components of the coating liquid for the surface layer, methyl cellulose was used as SM25 (Shin-Etsu), and silica gel WP2 (Crosfield) was used as the inorganic particle, and its average particle diameter was 15 μm.

TABLE 2

Example 3

Except that the composition of the coating solution in Example 1 as shown in Table 3 was carried out in the same manner as in Example 1. PVP K-90 (ISP) PVA 217 (Kuraray) was used as the binder resin lattice, Surcol SP6 (Allied Colloid) as the binder resin, and Surcol 443 (Allied Colloid) as the orange peel remover were used. In addition, silica Aerosil 200 (Degussa) was used as the inorganic particles, and the average particle diameter thereof was 12 to 16 nm. Among the components of the coating liquid for the surface layer, methyl cellulose was used as SM25 (Shin-Etsu), and silica gel WP2 (Crosfield) was used as the inorganic particle, and its average particle diameter was 15 μm.

TABLE 3

Example 4

Except that the composition of the coating solution in Example 1 as shown in Table 4 was carried out in the same manner as in Example 1. PVP K-90 (ISP) PVA 217 (Kuraray) was used as the binder resin lattice, Surcol 836 (Allied Colloid) as the binder resin, and Surcol 443 (Allied Colloid) as the orange peel remover were used. In addition, silica Aerosil 200 (Degussa) was used as the inorganic particles, and the average particle diameter thereof was 12 to 16 nm. Among the components of the coating liquid for the surface layer, methyl cellulose was used as SM25 (Shin-Etsu) and SM50 (Shin-Etsu), and silica gel WP2 (Crosfield) was used as the inorganic particle, and its average particle diameter was 15 μm.

TABLE 4

Example 5

Except that the composition of the coating solution in Example 1 as shown in Table 5 was carried out in the same manner as in Example 1. PVP K-90 (ISP) and PVA 217 (Kuraray) were used as binder resin lattice, Surcol 836 (Allied Colloid) as binder resin, and Surcol 443 (Allied Colloid) as orange peel remover were used. In addition, silica Aerosil 200 (Degussa) was used as the inorganic particles, and the average particle diameter thereof was 12 to 16 nm. Among the components of the coating liquid for the surface layer, methyl cellulose was used as SM25 (Shin-Etsu) and SM50 (Shin-Etsu), and its average particle diameter was 10 µm.

TABLE 5

Example 6

Except that the composition of the coating solution in Example 1 as shown in Table 4 was carried out in the same manner as in Example 1. PVP K-90 (ISP) and PVA 217 (Kuraray) were used as binder resin lattice, Surcol 836 (Allied Colloid) as binder resin, and Surcol 443 (Allied Colloid) as orange peel remover were used. In addition, silica Aerosil 200 (Degussa) was used as the inorganic particles, and the average particle diameter thereof was 12 to 16 nm. Among the components of the coating liquid for the surface layer, methyl cellulose was used as SM25 (Shin-Etsu) and SM50 (Shin-Etsu), and silica gel WP2 (Crosfield) was used as the inorganic particle, and its average particle diameter was 15 μm.

TABLE 6

Example 7

Except that the composition of the coating solution in Example 1 as shown in Table 7 was carried out in the same manner as in Example 1. PVP K-90 (ISP) and PVA 217 (Kuraray) were used as binder resin lattice, Surcol 836 (Allied Colloid) as binder resin, and Surcol 443 (Allied Colloid) as orange peel remover were used. In addition, silica Aerosil 200 (Degussa) was used as the inorganic particles, and the average particle diameter thereof was 12 to 16 nm. Among the components of the surface layer coating liquid, methyl cellulose was used as SM25 (Shin-Etsu) and SM50 (Shin-Etsu). Silica gel WP2 (Crosfield) was used as the inorganic particle, and the average particle diameter thereof was 15 µm.

TABLE 7

Comparative Example 1

Except that the composition of the coating solution in Example 1 as shown in Table 8 was carried out in the same manner as in Example 1. PVP K-90 (ISP) was used as the binder resin lattice, and Surcol 441 (Allied Colloid) was used as the binder resin. The average particle diameter of silica yloid 244 (Crosfield) used as the inorganic particles was 5-6 탆.

TABLE 8

Comparative Example 2

The coating liquid of following Table 9 and the composition was apply | coated to one side of the film using the transparent polyester film which has a thickness of 100 micrometers as a base film. The coating layer was applied at a solid content of 15 g / m 2 using a Meyer Bar Coater. Colloidal silica ST-OL (Ilsan Chemical Industry) was used as the inorganic particles, and its average particle diameter was 2 to 3 nm.

TABLE 9

The performance of the color development, dryness, water resistance, chemical resistance, transparency, and adhesion of the films for inkjet printers prepared in Examples 1 to 7 and Comparative Examples 1 to 2 was evaluated and shown in Table 10 below.

TABLE 10

◎: very good ○: good △: not good ×: bad

In the present invention, the composition of the aqueous layer further includes an orange peel remover composed of linear polymers linked to alkyl groups as well as inorganics to maximize the capacity of the ink, reduce haze due to leveling and remove impurities from sticking. And drying rate was increased by adding a small amount of particles to the protective layer. Thus, it is possible to provide an inkjet film excellent in color development, dryness, water resistance, chemical resistance, transparency, and adhesiveness, which shows the printing quality of color inkjet printers currently on the market.

Claims (5)

Transparent base film; Orange peel remover consisting of polyvinylpyrrolidone and / or polyacrylate on the base film, silica gel or alumina having an average particle size of 5 to 30nm dispersed in a solvent, and a linear polymer connected with an alkyl group An ink receiving layer composed of a composition of an ink receiving layer containing 1 to 10% by weight of the total; A protective layer formed on the ink receiving layer by coating with a protective layer composition comprising methyl cellulose or gelatin and an inorganic material; Film for color inkjet printer comprising a. The film of claim 1, wherein the inorganic material is silica gel or alumina having an average particle diameter of 10 to 30 μm. The film for color inkjet printer according to claim 1, wherein the ink receiving layer has a thickness of 5 to 15 µm. The film according to claim 1, wherein the polyacrylate is 5 to 70% by weight, the polyvinylpyrrolidone is 10 to 80% by weight, and the silica gel or alumina is 5 to 80% by weight. The film for color inkjet printer according to claim 1, wherein the protective layer has a thickness of 1 to 3 µm.