JPH08122968A - Supporting body for photographic printing paper and its production - Google Patents

Abstract

PURPOSE: To provide a supporting body for high resolution photographic printing paper and a producing method capable of preventing the generation of film crack or die lip stripe and excellent in the adhesively of a paper base body to a water resistant resin layer. CONSTITUTION: In the supporting body for photographic printing paper made by providing the water resistant resin coating layers 2-5 on both surface of the supporting body 1, at least two layers of the water resistant resin coating layers 2-5 is provided on the side to be coated with an emulsion, the water resistant resin coating layer 2, 4 of the lowermost layers in contact with the base body 1 are water resistant resins having 1.2-100g/min melt flow rate, are layers containing 0.5-60wt.% self-adhesiveness imparting agent resin per the water resistant resin and/or 5-500wt.% adhesive resin per the water resistant resin and at least one of another water resistant resin coating layers 3, 5 are water resistant resin coating layers composed of the water resistant resin and 5-60wt.% uniformly dispersed titanium dioxide per the water resistant resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic printing paper support, and more particularly to a photographic printing paper support having excellent resolution and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a support for photographic printing paper, a support whose both sides are coated with a resin is known, and in particular, titanium dioxide, a pigment, a bluing agent (blue (Including a pigment), a fluorescent whitening agent, and the like (US Pat. No. 3,501,298). Titanium dioxide used in this case has a function of improving light reflection efficiency as well as water resistance, and it is known that the image resolution is improved as the content of titanium dioxide is increased.

When forming the waterproof resin layer, a waterproof resin containing titanium dioxide is melt extruded in a film form from a slit die in a short time. When titanium dioxide is contained and melt extrusion is performed at a discharge temperature of 290 to 350 ° C. as in the conventional case, cracking of the water resistant resin layer (hereinafter,
Film cracking) and streaks (hereinafter referred to as die lip streaks) tend to occur in the die lip portion of the extruder.

When such a film crack occurs,
Not only the appearance of the product is significantly impaired, but also the water resistance is lost, so that the commercial value is lost, and when die lip streaks occur, continuous streaks occur in the longitudinal direction on the surface of the produced film or laminate. Not only the outer appearance of the film is significantly impaired, but also the transparency of the film becomes uneven during secondary processing such as stretching, resulting in a marked decrease in commercial value. Therefore, in order to improve such defects, when the discharge temperature is set to less than 290 ° C., the adhesive force between the paper base and the water resistant resin is significantly reduced.

Therefore, conventionally, even if the resolution is sacrificed,
A method of suppressing the content of titanium dioxide to 20% by weight or less has been adopted. However, recently, by adding a tackifier resin to a titanium dioxide-containing layer and melt-extruding at a discharge temperature of 175 to 290 ° C., a support for high-resolution printing paper having an increased content of titanium dioxide has been developed. (International Publication Number: WO92 / 17538).

[0006]

Therefore, the present inventors have made a detailed study on the above-mentioned support for high-resolution printing paper, and found that this method not only has insufficient dispersibility of titanium dioxide but also extruded titanium dioxide. It was found that the appearance of the product was likely to be poor because the peelability from the cooling roll after lamination was poor.

The inventors of the present invention have made earnest studies in order to more surely produce a high-resolution printing paper support, and as a result, as a coating layer on the emulsion coating side surface of a substrate, first, a tackifier resin and / or Alternatively, a water-resistant resin layer containing a heat-sealable adhesive resin and further containing a specific inorganic pigment is provided if necessary, and the titanium dioxide-containing layer contains the tackifier resin and the adhesive resin. If not included, 20% by weight or more of titanium dioxide can be easily included, and sufficient adhesiveness is maintained even when extrusion molding is performed at a melting temperature of less than 290 ° C. And has reached the present invention.

Therefore, a first object of the present invention is to provide a photographic printing paper support having excellent resolution which can be easily manufactured. A second object of the present invention is to provide a method for producing a support for high resolution photographic printing paper, which is capable of preventing the occurrence of film cracks and die lip streaks and is excellent in the adhesion between the paper base and the water resistant resin layer. Especially.

[0009]

The above objects of the present invention are to provide a support for photographic printing paper comprising a substrate and a water-resistant resin coating layer on both sides thereof, and at least the water-resistant resin on the emulsion coating side. The coating layer is composed of two or more layers, and the lowermost waterproof resin coating layer in contact with the substrate has a melt flow rate of 1.2 to 100 g / 10 min, and the water resistant resin. From 0.5 to 60% by weight of a tackifier resin with respect to the resin, and / or 5 to 500% by weight of an adhesive resin with respect to the water-resistant resin, and optionally talc, kaolin and calcium carbonate. A layer containing at least one selected inorganic pigment in an amount of 0.1 to 30% by weight with respect to the water resistant resin, wherein at least one of the other water resistant resin coating layers is a water resistant resin and For the water resistant resin Photographic printing paper support which is a water-resistant resin coating layer made of 60 wt% of uniformly dispersed titanium dioxide, and was achieved by the production method.

The photographic printing paper support of the present invention and the method for producing the same will be described in detail below. The water-resistant resin forming the coating layer in the present invention can be appropriately selected and used from resins that can be melt-extruded at 170 to 345 ° C., but normally a polyolefin resin such as polyethylene or polypropylene is used. To be In particular, the water-resistant resin forming the coating layer containing titanium dioxide is 170
The resin can be appropriately selected from the resins that can be melt-extruded at 290 ° C. to 290 ° C., but it is usually preferable to use a polyolefin resin such as polyethylene or polypropylene, and particularly preferable to use polyethylene.

The polyethylene may be any of high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (L-LDPE), etc., but the rigidity of the photographic paper support is emphasized. in case of,
It is preferable to use polypropylene, high-density polyethylene (HDPE), linear low-density polyethylene (L-LDPE), or the like. These resins may be used alone or in combination of two or more. In the present invention, the melt flow rate of the water resistant resin used in the lowermost water resistant resin coating layer in contact with the substrate on the emulsion coating side is 1.2.
It is necessary to be in the range of up to 100 g / 10 minutes,
The waterproof resin used for the waterproof resin coating layer other than the bottom layer also has a melt flow rate of 1.2 to 100 g / 10.
It is preferably in the range of minutes.

The tackifier resin used in the present invention is at least selected from the group consisting of a rosin derivative resin, a terpene resin (for example, polymer β-pinene), a coumarone-indene resin and a petroleum hydrocarbon resin. There is one kind. Specific examples of the petroleum hydrocarbon resin include aliphatic petroleum resin, aromatic petroleum resin, dicyclopentadiene petroleum resin, copolymer petroleum resin, hydrogenated petroleum resin and alicyclic petroleum resin. Is mentioned. The aliphatic petroleum resin is preferably one having 5 carbon atoms, and the aromatic petroleum resin is particularly preferably one having 9 carbon atoms. The compounding amount of such tackifier resin relative to the water resistant resin,
It is in the range of 0.5 to 60% by weight, preferably 10 to 3
It is in the range of 5% by weight. The compounding amount of tackifier resin is 0.
If it is less than 5% by weight, the adhesion will be poor, and if it exceeds 60% by weight, neck-in during production tends to occur.

Examples of the adhesive resin that can be heat-sealed with the water resistant resin used in the present invention include ionomer, adhesive polyolefin resin, polyethylene copolymer resin, ethylene vinyl acetate copolymer (EVA), ethylene. -Methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate maleic anhydride Polyolefin such as copolymer (E-EA-MAH), ethylene-methacrylic acid copolymer (EMAA), polypropylene (PP) and polyethylene (PE) grafted with maleic anhydride (MAH-
g-polyolefin) and metal salts thereof.

The amount of the adhesive resin compounded is 5 to 500% by weight, preferably 10 to 200% by weight, based on the water resistant resin. The talc, kaolin or calcium carbonate used in the present invention preferably has an average particle diameter of 0.01 to 1.0 μm, particularly preferably 0.1 to 0.5 μm. Average particle size is 0,
If it is less than 01 μm, it is difficult to disperse, and if it exceeds 1.0 μm, the surface state of the coated surface is deteriorated. Addition amount is 0.1-3
It is 0% by weight, preferably 1.0 to 20% by weight. 0.
If it is less than 1% by weight, the desired adhesion cannot be obtained, and if it exceeds 30% by weight, the whiteness is lowered. If at least one pigment selected from these pigments is used, Ba
The adhesiveness between the water-resistant resin coating layer and the base paper layer is extremely excellent as compared with the case where an inorganic pigment such as SO ₄ , ZnO, TiO ₂ , ZnS, MgCO ₃ , or carbon is used. In the present invention, it is particularly preferable to use talc.

The form of titanium dioxide used in the present invention is
The anatase type or the rutile type may be used, but the anatase type is preferably used when the whiteness is prioritized, and the rutile type is preferably used when the sharpness is prioritized. In consideration of both whiteness and sharpness, anatase type and rutile type may be blended and used, or two layers of titanium dioxide-containing layer and one layer of anatase type titanium dioxide may be added. Alternatively, rutile type titanium dioxide may be added to the other layer.

The average particle size of titanium dioxide is 0.1-0.1.
The range is preferably 0.4 μm. When the average particle size is less than 0.1 μm, it becomes difficult to uniformly mix and disperse in the resin layer, while when it exceeds 0.4 μm, sufficient whiteness cannot be obtained and projections are formed on the surface of the upper coating. Occurs, which adversely affects the image quality. Examples of titanium dioxide having such a form and an average particle size include, for example, trade names KA-10 and KA-20 manufactured by Titanium Industry Co., Ltd., trade names A-220 and PF-656 manufactured by Ishihara Sangyo Co., Ltd.
PF-654, PF-671, PF-715, CR-6
3 and the like.

As the titanium dioxide, in order to suppress its activity and prevent yellowing, its surface is generally surface-treated with an inorganic substance such as hydrous aluminum oxide or hydrous silicon oxide, polyhydric alcohol, polyvalent amine, It is possible to use those which have been surface-treated with an organic substance such as metal soap, alkyl titanate and polysiloxane, and those which have been surface-treated in combination with a treatment agent for an inorganic substance / organic substance. These treating agents are 0.2 to 2.0% by weight with respect to titanium dioxide in the case of an inorganic substance, and 0.1 to 2.0% in the case of an organic substance.
It is preferably used in the range of 1.0% by weight.

Titanium dioxide uses a metal salt of higher fatty acid, higher fatty acid ethyl, higher fatty acid amide, higher fatty acid and the like as a dispersion aid, and is water resistant by a kneader such as a two-roll, three-roll, kneader or Banbury mixer. Kneaded into resin. The resulting titanium dioxide-containing water resistant resin,
It is molded into pellets and used as a titanium dioxide masterbatch. The titanium dioxide concentration in the pellet is
Generally, it is preferably about 30 to 75% by weight, and the dispersion aid is generally 0.5 to 10% with respect to the amount of titanium dioxide.
It is preferable that the amount is about% by weight. If the titanium dioxide concentration is less than 30% by weight, the resolution will be insufficient, and conversely, if it exceeds 75% by weight, cracking tends to occur when bent.

The water-resistant resin layer on the emulsion side may contain a bluing agent. Examples of the bluing agent include generally known ultramarine blue, cobalt blue, cobalt oxide phosphate, quinacridone pigment and the like, and a mixture thereof. Although the particle size of the bluing agent is not particularly limited, it is usually preferably in the range of 0.3 to 10 μm.

The bluing agent in the multilayer waterproof resin layer in the present invention is 0.2 to 0.
4% by weight, 0 to 0.15% by weight when used on the lower layer side
It is preferable to contain in the range of. The bluing agent is kneaded into the waterproof resin with a kneader such as a two-roll, three-roll, kneader or Banbury mixer. The water-resistant resin containing the bluing agent thus obtained is molded into a pellet shape and used as a masterbatch of the bluing agent.

The concentration of the bluing agent in the pellet is 1
It is preferably about 30% by weight. Titanium dioxide can also be kneaded together when molding the bluing agent pellets, and to help disperse the bluing agent, a low molecular weight water resistant resin, a metal salt of a higher fatty acid,
Dispersion aids such as higher fatty acid esters, higher fatty acid amides and higher fatty acids can be used. The water resistant resin layer according to the present invention may contain an antioxidant.
The content is 50 to 1,000 with respect to the water resistant resin amount.
It is preferably about ppm. The masterbatch containing the titanium dioxide and / or the bluing agent thus prepared is appropriately diluted with a water resistant resin and then used for coating.

Next, in the multi-layered waterproof resin layer in the present invention, the pellets containing the above-mentioned titanium dioxide and / or the bluing agent that have been melted by heating are melted, and if necessary, diluted with a water resistant resin and melted, It is formed on a running substrate such as paper or synthetic paper by either a sequential laminating method or a laminating method using a multi-layer extrusion die such as a foot block type, a multi-manifold type or a multi-slot type. The shape of the multilayer extrusion die is not particularly limited, but a T die, a coat hanger die and the like are generally preferably used.

In particular, in the production method of the present invention, first, the water-resistant resin containing the tackifier resin described above on the surface on the emulsion coating side and / or the water-resistant resin containing an adhesive resin that can be heat-sealed with the water-resistant resin. A coating layer is formed using a water-soluble resin, and a water resistant resin layer containing titanium dioxide is then formed on the coating layer.
In a temperature range of 70 to 290 ° C., a laminate film is formed by melt extruding from a slit die into a film in a short time.

When the melt extrusion temperature is lower than 170 ° C., the water resistant resin is insufficiently oxidized and the adhesion between the water resistant resin layers is deteriorated. On the other hand, when the temperature exceeds 290 ° C, film cracks and die lip streaks occur, and the appearance of the product is significantly impaired. Before the resin is coated on the substrate, the substrate is preferably subjected to activation treatment such as corona discharge treatment, flame treatment, glow discharge treatment, or plasma treatment.

When the multilayer waterproof resin layer of the present invention comprises, for example, three layers, the thickness of the uppermost layer is 0.5 to 50 μm.
m, the thickness of the intermediate layer is 5 to 50 μm, and the thickness of the bottom layer is 0.
It is preferably 5 to 10 μm. The outermost surface of the water-resistant resin layer on the emulsion-coated side has a glossy surface, or is disclosed in JP-A-55-
The fine surface, the matte surface or the matte surface described in Japanese Patent No. 26507 is formed, and the back surface is formed as a matte surface. The surface after imprinting can be subjected to activation treatment such as corona discharge treatment or flame treatment.
It is also possible to perform a subbing process as described in JP-A-1-846443.

As the substrate used in the present invention, a natural pulp paper containing normal natural pulp as a main component, a mixed paper consisting of natural pulp and synthetic fibers, a synthetic fiber paper containing synthetic fibers as a main component, polystyrene, Any of so-called synthetic papers obtained by quasi-synthesizing a synthetic resin film such as polypropylene may be used, but natural pulp paper (hereinafter simply referred to as base paper) is particularly preferably used as a substrate for photographic printing paper.

Examples of chemicals to be added to the base paper include alkyl ketene dimer, fillers such as clay, talc, calcium carbonate, urea resin fine particles, rosin, higher fatty acid salts, paraffin wax, alkenyl succinic acid and other size agents, and polyacrylamide. A paper-strengthening agent such as the above, a fixing agent such as a sulfuric acid band, or the like is used. Other,
If necessary, dyes, fluorescent dyes, slime control agents, defoaming agents, etc. are added.

If necessary, the following softening agents can be added. With respect to the softening agent, for example, New Paper Processing Handbook (edited by Shiyaku Time Co., Ltd.), pages 554 to 555 (198)
Although it has been described in "0 years", those having a molecular weight of 200 or more are particularly preferable. This softening agent has a hydrophobic group having 10 or more carbon atoms and is an amine salt or a quaternary ammonium salt that self-fixes with cellulose.

Specific examples of the softening agent include a reaction product of a maleic anhydride copolymer and a polyalkylene polyamine, a reaction product of a higher fatty acid and a polyalkylene polyamine, and a reaction product of a urethane alcohol and an alkylating agent. Examples thereof include a quaternary ammonium salt of a higher fatty acid, and a reaction product of a maleic anhydride copolymer with a polyalkylene polyamine and a reaction product of a urethane alcohol with an alkylating agent are particularly preferable.

The surface of the pulp can be surface-sized with a film-forming polymer such as gelatin, starch, carboxymethyl cellulose, polyacrylamide, polyvinyl alcohol, or a modified product of polyvinyl alcohol. Examples of the modified product of polyvinyl alcohol in this case include a modified product of a carboxyl group, a modified product of silanol, and a copolymer with acrylamide. The coating amount of the film-forming polymer is adjusted to 0.1 to 5.0 g / m ² , preferably 0.5 to 2.0 g / m ² . Furthermore, an antistatic agent, a fluorescent whitening agent, a pigment, an antifoaming agent and the like can be added to the above film-forming polymer, if necessary.

The base paper is made by making a pulp slurry containing the above-mentioned pulp and additives such as a filler, a sizing agent, a paper-strengthening agent, and a fixing agent, which are added if necessary, with a paper machine such as a Fourdrinier paper machine. Manufactured by drying, rolling up. Either before or after the drying, the surface size treatment is performed, and the calendar treatment is performed between the drying and the winding.

When the surface sizing treatment is performed after drying, the above-mentioned calendering treatment can be carried out either before or after the surface sizing treatment, but the calendering treatment is carried out in the final finishing step after various treatments. Preferably. As the metal roll and elastic roll used for the calendering process, known rolls used for ordinary paper production are used. The base paper used for the photographic printing paper support of the present invention is finally subjected to the above-mentioned calendering treatment,
The film thickness is adjusted to 50 to 250 μm. The density of the base paper is
0.8-1.3 g / m ³ , preferably 1.0-1.2 g
/ M ³ .

The support for photographic printing paper in the present invention comprises:
Various back coat layers can be provided for the purpose of preventing electrification and curling. Further, the backcoat layer has Japanese Examined Patent Publication Nos. 52-18020, 57-9059, 57-53940, 58-56859,
JP-A-59-214849, JP-A-58-18414
Inorganic antistatic agents, organic antistatic agents, hydrophilic binders, latexes, curing agents, pigments, surfactants and the like, which are described or exemplified in each publication such as No. 4 and the like, can be contained in appropriate combination.

The photographic support according to the present invention is coated with various photographic constituent layers to provide color photographic printing paper, black-and-white photographic printing paper, typesetting photographic paper, reversal photographic material, silver salt diffusion transfer negative and positive, and printing. It can be used for various applications such as materials. For example, silver chloride, silver bromide, silver chlorobromide, silver iodobromide, and silver chloroiodobromide emulsion layers can be provided. It is also possible to provide a color coupler in the silver halide photographic emulsion layer to provide a multilayer silver halide color photographic constituent layer. The silver salt diffusion transfer image-receiving layer can be provided by incorporating a physical phenomenon nucleus.

[0035]

INDUSTRIAL APPLICABILITY In the present invention, a tackifier resin-containing water-resistant resin layer and / or an adhesive resin-containing water-resistant resin layer having good adhesion to both the substrate and the water-resistant resin layer on the surface of the substrate. Since the titanium dioxide-containing water resistant resin layer is extruded at a melting temperature of 290 ° C. or less, the adhesiveness can be sufficiently maintained. The amount can be increased. As described above, the support of the present invention contains a high concentration of titanium oxide in the water resistant resin layer, and is therefore suitable for obtaining a photographic printing paper excellent in resolution.

[0036]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.

Embodiment 1 On the back surface of a paper substrate 1 having a width of 50 cm and an average weight of 170 g / m ² treated by corona discharge with an output of 1 kW, a polyethylene resin having the composition shown in Table 1 below was multilayer extruded and laminated at 325 ° C. and a line speed of 200 m / min. Then, water-resistant resin layers 4 and 5 of polyethylene resin having a thickness of 14 μm were provided respectively (see FIG. 1).

[Table 1]

Next, on the front surface of the paper base 1 which is the emulsion coating side, the water resistant resin layer 2 having the composition and conditions shown in Table 2 below is used.
Further, the titanium-containing water-resistant resin layer 3 was provided to prepare a support for photographic printing paper (see FIG. 1).

[Table 2]

Embodiment 2 FIG. After the water resistant resin layers 4 and 5 of polyethylene resin were provided on the back surface of the paper substrate 1 in the same manner as in Example 1, the composition shown in Table 3 below was applied to the front surface of the paper substrate 1 on the emulsion coating side. A water resistant resin layer 2 and a titanium-containing water resistant resin layer 3 were provided under the conditions to prepare a support for photographic printing paper.

[Table 3]

Example 3. As in Example 1, after the water resistant resin layers 4 and 5 of polyethylene resin were provided on the back surface of the paper base 1, the composition shown in Table 4 below was applied to the front surface of the paper base 1, which was the emulsion coating side. A water resistant resin layer 2 and a titanium-containing water resistant resin layer 3 were provided under the conditions to prepare a support for photographic printing paper.

[Table 4]

Example 4. After the water resistant resin layers 4 and 5 of polyethylene resin were provided on the back surface of the paper substrate 1 in the same manner as in Example 1, the composition shown in Table 5 below was applied to the front surface of the paper substrate 1 which was the emulsion coating side. A water resistant resin layer 2 and a titanium-containing water resistant resin layer 3 were provided under the conditions to prepare a support for photographic printing paper.

[Table 5]

Example 5. After the water resistant resin layers 4 and 5 of polyethylene resin were provided on the back surface of the paper substrate 1 in the same manner as in Example 1, the composition shown in Table 6 below was applied to the front surface of the paper substrate 1 on the emulsion coating side. The water resistant resin layers 2 and 6 and the titanium-containing water resistant resin layer 3 were provided under the conditions to prepare a support for photographic printing paper (see FIG. 2).

[Table 6]

Example 6. After the water resistant resin layers 4 and 5 of polyethylene resin were provided on the back surface of the paper substrate 1 in the same manner as in Example 1, the composition shown in Table 7 below was applied to the front surface of the paper substrate 1 on the emulsion coating side. A water resistant resin layer 2 and titanium-containing water resistant resin layers 3 and 6 were provided under the conditions to prepare a support for photographic printing paper.

[Table 7]

Example 7. After the water resistant resin layers 4 and 5 of polyethylene resin were provided on the back surface of the paper substrate 1 in the same manner as in Example 1, the composition shown in Table 8 below was formed on the front surface of the paper substrate 1 on the emulsion coating side. The water resistant resin layers 2 and 6 and the titanium-containing water resistant resin layer 3 were provided under the conditions to prepare a support for photographic printing paper.

[Table 8]

Example 8. After the water resistant resin layers 4 and 5 of polyethylene resin were provided on the back surface of the paper substrate 1 in the same manner as in Example 1, the composition shown in Table 9 below was formed on the front surface of the paper substrate 1 on the emulsion coating side. The water resistant resin layers 2 and 6 and the titanium-containing water resistant resin layer 3 were provided under the conditions to prepare a support for photographic printing paper.

[Table 9]

Example 9. After the water resistant resin layers 4 and 5 of polyethylene resin were provided on the back surface of the paper substrate 1 in the same manner as in Example 1, the composition shown in Table 10 below was applied to the front surface of the paper substrate 1 which was the emulsion coating side. The water resistant resin layers 2 and 6 and the titanium-containing water resistant resin layer 3 were provided under the conditions to prepare a support for photographic printing paper.

[Table 10]

Example 10. As in Example 1, paper substrate 1
After the water resistant resin layers 4 and 5 of polyethylene resin are provided on the back surface of the paper, the water resistant resin layer 2 and titanium are contained on the front surface of the paper base 1, which is the emulsion coating side, in the composition and conditions shown in Table 11 below. The water resistant resin layers 3 and 6 were provided to prepare a support for photographic printing paper.

[Table 11]

Example 11. As in Example 1, paper substrate 1
After the water resistant resin layers 4 and 5 of polyethylene resin are provided on the back surface of the paper, the water resistant resin layer 2 and titanium are contained on the front surface of the paper base 1 which is the emulsion coating side under the composition and conditions shown in Table 12 below. The water resistant resin layers 3 and 6 were provided to prepare a support for photographic printing paper.

[Table 12]

Example 12 As in Example 1, paper substrate 1
After the water resistant resin layers 4 and 5 of polyethylene resin are provided on the back surface of the paper, the water resistant resin layer 2 and titanium are contained on the front surface of the paper substrate 1 which is the emulsion coating side in the composition and conditions shown in Table 13 below. The water resistant resin layers 3 and 6 were provided to prepare a support for photographic printing paper.

[Table 13]

Example 13. As in Example 1, paper substrate 1
After the water resistant resin layers 4 and 5 of polyethylene resin are provided on the back surface of the paper, the water resistant resin layer 2 and titanium are contained in the composition and conditions shown in Table 14 below on the front surface of the paper substrate 1 which is the emulsion coating side. The water resistant resin layers 3 and 6 were provided to prepare a support for photographic printing paper.

[Table 14]

Example 14 As in Example 1, paper substrate 1
After providing the water resistant resin layers 4 and 5 of polyethylene resin on the back surface of the paper, the water resistant resin layers 2 and 6 and the water resistant resin layers 2 and 6 and The titanium-containing waterproof resin layer 3 was provided to prepare a support for photographic printing paper.

[Table 15]

Example 15 As in Example 1, paper substrate 1
After providing the water resistant resin layers 4 and 5 of polyethylene resin on the back surface of the paper, the water resistant resin layers 2 and 6 and the water resistant resin layers 2 and 6 and The titanium-containing waterproof resin layer 3 was provided to prepare a support for photographic printing paper.

[Table 16]

Example 16. As in Example 1, paper substrate 1
After the water resistant resin layers 4 and 5 of polyethylene resin are provided on the back surface of the paper, the water resistant resin layers 2 and 3 and A titanium-containing water resistant resin layer 6 was provided to prepare a support for photographic printing paper.

[Table 17]

Example 17 As in Example 1, paper substrate 1
After providing the water resistant resin layers 4 and 5 of polyethylene resin on the back surface of the paper, the water resistant resin layers 2 and 3 and the water resistant resin layers 2 and 3 and A titanium-containing water resistant resin layer 6 was provided to prepare a support for photographic printing paper.

[Table 18]

Example 18. As in Example 1, paper substrate 1
After providing the water resistant resin layers 4 and 5 of polyethylene resin on the back surface of the paper, the water resistant resin layers 2 and 3 and the water resistant resin layers 2 and 3 having the composition and conditions shown in Table 19 below are provided on the front surface of the paper substrate 1 which is the emulsion coating side. A titanium-containing water resistant resin layer 6 was provided to prepare a support for photographic printing paper.

[Table 19]

Example 19 As in Example 1, paper substrate 1
After providing the water resistant resin layers 4 and 5 of polyethylene resin on the back surface of the paper, the water resistant resin layers 2 and 6 and the water resistant resin layers 2 and 6 having the composition and conditions shown in Table 20 below are provided on the front surface of the paper substrate 1 which is the emulsion coating side. The titanium-containing waterproof resin layer 3 was provided to prepare a support for photographic printing paper.

[Table 20]

Example 20. As in Example 1, paper substrate 1
After the water-resistant resin layers 4 and 5 of polyethylene resin are provided on the back surface of the paper, the water-resistant resin layer 2 and titanium are contained on the front surface of the paper base 1, which is the emulsion coating side, in the composition and conditions shown in Table 21 below. The water resistant resin layers 3 and 6 were provided to prepare a support for photographic printing paper.

[Table 21]

Example 21. As in Example 1, paper substrate 1
After providing the water resistant resin layers 4 and 5 of polyethylene resin on the back surface of the paper, the water resistant resin layer 2 and the titanium-containing material are provided on the front surface of the paper base 1 which is the emulsion coating side in the composition and conditions shown in Table 22 below. The water resistant resin layers 3 and 6 were provided to prepare a support for photographic printing paper.

[Table 22]

Comparative Example 1. After providing the coating layers 4 and 5 of polyethylene resin on the back surface of the paper substrate 1 in the same manner as in Example 1,
A single water-resistant resin layer was provided on the front surface of the paper substrate 1 on the emulsion coating side under the composition and conditions shown in Table 9 below to prepare a support for photographic printing paper.

[Table 23]

Comparative Example 2. After providing the coating layers 4 and 5 of polyethylene resin on the back surface of the paper substrate 1 in the same manner as in Example 1,
A single water-resistant resin layer was provided on the front surface of the paper substrate 1 which was the emulsion coating side with the composition and conditions shown in Table 10 below to prepare a support for photographic printing paper.

[Table 24]

Comparative Example 3. Providing the waterproof resin layer 2 and the titanium-containing waterproof resin layer 3 at a laminate discharge temperature of 260 ° C.
A support for photographic printing paper was produced in the same manner as in Comparative Example 1 except that.

Comparative Example 4. Except that the addition amount of Alcon P-140 in the coating layer 2 in Example 3 was set to 0.3%,
A support for photographic printing paper was prepared in the same manner as in Example 3. Table 25 shows the results of Examples 1 to 21 and Comparative Examples 1 to 4.

[0063]

[Table 25] ○: Within allowable range ×: Inferior

[Brief description of drawings]

FIG. 1 is a schematic partial cross-sectional view of a photographic printing paper support of the present invention.

FIG. 2 is a schematic partial cross-sectional view of a support for photographic printing paper of the present invention in which the water-resistant coating layer on the emulsion side has three layers.

[Explanation of symbols]

 1 Base 2 Water Resistant Resin Layer 3 Water Resistant Resin Layer 4 Water Resistant Resin Layer 5 Water Resistant Resin Layer 6 Water Resistant Resin Layer

Claims (6)

[Claims] 1. A photographic printing paper support comprising a substrate and a water resistant resin coating layer on both sides thereof, wherein at least the water resistant resin coating layer on the emulsion coating side comprises two or more layers and said substrate The lowermost water-resistant resin coating layer in contact with the water-resistant resin having a melt flow rate in the range of 1.2 to 100 g / 10 minutes, and 0.5 with respect to the water-resistant resin.
To 60% by weight of a tackifier resin, and / or a layer containing 5 to 500% by weight of an adhesive resin with respect to the water resistant resin, the layer being at least one of other water resistant resin coating layers. Is 5 to 60 relative to the water resistant resin and the water resistant resin.
A support for photographic printing paper, which is a water-resistant resin coating layer composed of titanium dioxide uniformly dispersed by weight. 2. The lowermost waterproof resin coating layer is at least one selected from talc, kaolin and calcium carbonate.
0.1 to 30 kinds of inorganic pigments with respect to the water resistant resin.
The photographic printing paper support according to claim 1, wherein the photographic printing paper support is contained in a weight percentage. 3. The tackifier resin according to claim 1, wherein the tackifier resin is at least one selected from the group consisting of rosin derivative resins, terpene resins, coumarone-indene resins and petroleum hydrocarbon resins. Photographic paper support. 4. The adhesive resin is selected from the group consisting of ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers and metal salts thereof, adhesive polyolefin resins and ethylene methyl methacrylate copolymer resins. The support for photographic printing paper according to claim 1 or 2, which is at least one kind. 5. A water-resistant resin in a water-resistant resin coating layer other than the lowest water-resistant resin coating layer in contact with the substrate on the emulsion coating side has a melt flow rate of 1.2 to 100 g / 10.
The photographic paper support according to claim 1, which is a water-resistant resin in the range of minutes. 6. A support for photographic printing paper according to claim 1, wherein the water resistant resin coating layer containing titanium dioxide is extruded in the range of 170 to 290 ° C. Body manufacturing method.