JP2002357885A - Molding for photosensitive material, photosensitive material package and method for producing the molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding for a photosensitive material which does not deteriorate photographic characteristics, is excellent in mechanical characteristics and ensures little environmental load and to provide a photosensitive material package and a method for producing the molding. SOLUTION: In the molding for a photosensitive material, the component ratio by weight between cellulose fibers derived from paper and all thermoplastic resins is (51:49) to (75:25) and at least one antioxidant and at least one aldehyde-neutralizing agent are contained. The photosensitive material package comprises a photosensitive material used together with the molding. The method for producing the molding includes a step for mixing pellets obtained by crushing, compressing and granulating base paper made for photographic printing paper and thermoplastic resins having a >=15g/10 main melt flow rate in such a way as to give a component ratio of 51-75 pts.wt. paper to 49-25 pts.wt. all the thermoplastic resins and a step for molding the resulting mixture with a molding machine at >=180 deg.C cylinder temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article for a photosensitive material including a container for accommodating a photosensitive material such as a photographic film or photographic paper, a member used for storing a raw material of a photosensitive material, and the like. The present invention relates to a photosensitive material package made of a photosensitive material used together with a molded product for a material, and a method for producing the same.

[0002]

2. Description of the Related Art Thermoplastic resins such as polystyrene (PS), polypropylene (PP), and polyethylene (PE) are frequently used in molded articles for photosensitive materials from the viewpoint of photographic properties, strength, and the like. When these thermoplastic resins are used in molded articles for photosensitive materials, they have a large environmental burden when they are discarded after use. There is an urgent need to reduce this environmental load, and a paper / resin mixture (hereinafter, also referred to as “paper resin”) in which the proportion of paper in the mixture exceeds 50% by weight has emerged as an alternative. As a paper resin, there is a disclosure of a paper resin using photographic paper waterproof paper in which both surfaces of a used paper or a base paper are coated with a polyolefin resin, that is, "WP (water-proof) paper", for example, Japanese Patent No. 3007808. According to the gazette, used paper (or WP paper) such as a betting ticket or a magazine is pulverized into a floc, mixed with a polyolefin elastomer, and rotationally compressed into paper pellets, and then extruded by blending with a desired resin such as PP. A pellet-shaped paper resin is obtained by a machine. Japanese Patent Application Laid-Open No. 11-99522 discloses a method for obtaining paper resin pellets by a similar method. However, using these paper resin pellets, it is applicable to molded products for photosensitive materials, for example, molded products for printed photosensitive materials in roll form (flanges, core caps, molded cushioning materials, etc.) and molded materials for color copying photosensitive materials. Then, it became clear that the photographic characteristics, particularly the sensitivity was lowered.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a molded article for a photosensitive material which does not deteriorate photographic characteristics, has excellent mechanical characteristics, and has a low environmental load. Another object of the present invention is to provide a photosensitive material package comprising the photosensitive material molded article and the photosensitive material used therewith. Still another object of the present invention is to provide a method for producing the molded article for a photosensitive material. Here, the “mechanical characteristics” include having a rigidity that does not cause deformation at the mouth due to high-speed air conveyance.

[0004]

According to one aspect of the present invention, the following solutions are provided. A molded article having a weight ratio of cellulose fiber derived from paper to total thermoplastic resin of 51:49 or more and 75:25 or less, wherein at least one kind of antioxidant and at least one kind of aldehyde neutralizer A molded article for a photosensitive material, comprising: According to another aspect of the present invention, the following solution is provided. The weight ratio of the cellulose fiber derived from paper to the total thermoplastic resin is 51:49 or more by weight.
5:25 or less, comprising a molded article for a photosensitive material containing at least one antioxidant and at least one aldehyde neutralizing agent, and a photosensitive material used together therewith. Photosensitive material packaging. According to still another aspect of the present invention, the following solution is provided. Crush base paper made for photographic printing paper,
Compression-granulated pellets and melt flow rate 15 g /
A step of mixing a thermoplastic resin for 10 minutes or more with a composition ratio of 51 to 75 parts by weight of paper and 49 to 25 parts by weight of the thermoplastic resin, and mixing the mixture at a cylinder temperature of 180.
A method for producing a molded article for a photosensitive material, comprising a step of molding by a molding machine at a temperature of not more than ° C in this order.

[0005] The term "total thermoplastic resin" means the total of the polyolefin resin coating the waterproof paper for photographic paper and all the thermoplastic resins added in the production process. When the “all thermoplastic resins” are provided with a lining layer, this also includes the thermoplastic resin for the lining layer.

Further, the photosensitive material package comprises a photosensitive material molded article and a photosensitive material used together therewith. When the photosensitive material molded article is a container, the photosensitive material may be accommodated in the container to form a photosensitive material package.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The above-mentioned invention is intended to minimize the decomposition of cellulose by molding at a temperature as low as possible, to search for additives for cellulolysis, It has been completed as a result of intensive studies with the guideline of chemically neutralizing the product. The material of the molded article for a photosensitive material of the present invention and a typical production process will be described in detail below.

As base paper which can be used for the molded article for light-sensitive material and the light-sensitive material package of the present invention, vegetable cellulose fibers which are generally sold as pulp can be used. Raw materials used for pulp include pine, cedar, cypress and other softwood materials,
Beech, shii, eucalyptus and other broadleaf forest materials, mitsumata, bamboo,
And the like. Reuse of paper resources has attracted a great deal of interest for the preservation of forest resources, and has occurred in newspapers, weekly magazines, magazines, advertising leaflets, etc., collected paper collected at homes, offices, stations, bookbinding and printing plants. Vegetable cellulose fibers regenerated as waste paper pulp from various processes such as defibration, rough screening, aging, deinking, fine screening, and bleaching from waste paper and waste paper can also be used.

In the present invention, as the cellulose fibers derived from the base paper, it is preferable to use base paper manufactured for photographic printing paper and / or waterproof paper for photographic paper obtained by coating the base paper with a polyolefin resin.

In the present invention, the term "base paper produced for photographic printing paper" preferably means that the cellulose fiber obtained after pulverization has a weight-average fiber length of 0.30 mm or more, and 0.1 to 0.3 mm.
It refers to base paper in the range of 50 mm or less. Examples of the base paper include base paper made by kraft pulp and the like, and are often used for photographic printing paper.However, base paper used for other purposes also satisfies the above-described fiber length characteristics. As long as the "base paper manufactured for photographic printing paper" of the present invention
It is included in. The weight average fiber length can be measured by an optical measuring device as described in the examples. The weight-average fiber length gives a measured value which is almost the same whether measured immediately after pulverization or during the production process of a molded article.

The "base paper manufactured for photographic printing paper" according to the present invention is characterized in that the base paper before pulverization has a cellulose fiber weight average fiber length of 0.4 mm or more and 0.7 mm or more.
It is preferable to use the following hardwood bleached kraft pulp. The waterproof paper for photographic paper using such a base paper is pulverized by a refiner, and the weight-average fiber length of the cellulose fiber obtained after the pulverization is 0.30 as described above.
It is particularly preferable that the thickness be in the range of not less than mm and not more than 0.50 mm. If the weight-average fiber length of the cellulose fibers before pulverization exceeds 0.7 mm, the kneading property with the resin tends to deteriorate, and a high temperature of 250 ° C. or more and a long time tend to be required for kneading. When the fiber length is less than 0.4 mm, 220
Although kneading can be performed for a short time at a relatively low temperature of about ° C, the precision and strength of the obtained paper resin molded article tend to decrease. By using a base paper using a cellulose fiber having a weight average fiber length of 0.4 mm or more and 0.7 mm or less in the base paper before pulverization, high surface smoothness and high molding precision of a paper resin molded product are obtained. , And high molding strength can be obtained. The length of the cellulose fibers is preferably uniform. If the length of the cellulose fiber is made uniform, the kneading step and the forming step of the production of the molded article of paper resin can proceed uniformly and stably. Further, the time required for these steps can be shortened, unnecessary heat energy is not applied, and the adverse effect on the photographic properties of the obtained paper resin molded article can be minimized.

As the "base paper manufactured for photographic printing paper" used in the present invention, hardwood bleached kraft pulp (LBKP) is preferably used as a raw material. LBKP
A papermaking method using as a raw material is described in JP-A-10-245791.

The pulp constituting the "base paper manufactured for photographic printing paper" used in the present invention preferably has (1) a weight average degree of polymerization of 800 or more,
(2) The paper surface pH of the base paper is preferably 6.0 or more, and (3) the internal bonding force of the base paper is 10 to 20 (N
Cm), and it is particularly preferable that (1), (2) and (3) are simultaneously satisfied. Details of these characteristics are described in JP-A-3-149542 (Patent No. 2).
No. 671154).

As additives which can be used in the "base paper manufactured for photographic printing paper", a combination prepared so as not to adversely affect photographic properties is preferable. That is,
The additive to the base paper is preferably an additive that does not adversely affect the raw storability of the photosensitive material, the storability of a developed print, and the like. Such additives include a sizing agent (rosin, higher fatty acid salt, alkyl ketene dimer, alkenyl succinic acid, etc.), a paper strength enhancer (polyacrylamide, etc.), a fixing agent (sulfuric acid band, etc.), a pH adjuster ( Sodium aluminate, sodium hydroxide, etc.), fillers (clay, talc, calcium carbonate, etc.), and other additives (dyes, slime control agents, etc.).

The base paper which can be preferably used in the present invention is a paper using amphoteric polyacrylamide (JP-A-59-31949) as a paper strength enhancer. Particularly useful paper-strengthening agents have an average molecular weight of 2.5 to 5,000,000 as measured by gel permeation chromatography.
It is an amphoteric polyacrylamide. This amphoteric polyacrylamide is an amphoteric copolymer obtained by copolymerizing an anionic monomer and a cationic monomer while using acrylamide or methacrylamide as a main monomer (JP-A-6-16).
No. 7767). Further, it is preferable that the base paper is a neutral paper made in a neutral range in which the pH of the stock is 6.0 or more and 7.5 or less. Outside this range, hydrolysis of the cellulose tends to occur. When the cellulose constituting the base paper undergoes hydrolysis, its molecular weight (degree of polymerization) decreases, and the strength of the base paper decreases. When paper resin pellets are produced using base paper having a reduced molecular weight, 1) cellulose fibers are susceptible to thermal decomposition during molding, 2) Izod strength is reduced, and 3) acid gas or the like which adversely affects photographic properties is generated. Evils, for example, occur. Therefore, it is preferable that the paper is made in the neutral region so that the paper surface pH of the base paper becomes 6.0 or more and 7.5 or less.

As the polyolefin used in the production of waterproof paper for photographic paper in which both sides of the base paper are coated with a polyolefin resin, homopolymers of α-olefins such as polyethylene and copolymers thereof are preferable. Listed are high density polyethylene (HDPE), low density polyethylene (LDPE), and mixtures thereof. The molecular weight of these polyolefins is not particularly limited as long as a white pigment or a fluorescent whitening agent can be added to the extrusion-coated layer, but usually the average molecular weight is from 20,000 to 20,000. 200,0
A polyolefin in the range of 00 is used.

The thickness of the polyolefin resin coating layer is preferably 15 to 50 μm. When an additive is used in the above-mentioned α-olefin homopolymer, this additive may also be an additive which does not adversely affect the raw storage stability of the photosensitive material, the storage stability of a developed print, and the like. preferable. In particular, it is preferable to add a white pigment, a coloring content and an antioxidant to the polyolefin resin coating layer on the side where the photographic emulsion is applied.

A typical layer structure of the waterproof paper for photographic paper is such that an LDPE layer containing titanium dioxide and zinc stearate, a base paper layer, and calcium stearate are coated from the front side to the photographic emulsion coated side to the opposite side. LDPE contained
And HDPE mixture layers. To describe typical basis weights, the initial LDPE weight is 21-32 g / m ² , the base paper layer is 135-167 g / m ² , and the later LDPE
PE and HDPE mixture layer is 23~24g / ^{m 2.}

In the production of the paper resin in the present invention, base paper manufactured for photographic printing paper may be used, but it is preferable to use waterproof paper for photographic paper in which the base paper is coated with a polyolefin resin.

Other thermoplastic resins usable in the present invention include polyethylene (PE) and polypropylene (PP).
Such as polyolefins, polyethylene terephthalate,
Polyesters such as polybutylene terephthalate, polyamides such as nylon 6, nylon 66, nylon 11, and nylon 12, polystyrene, and polystyrene copolymer can be preferably used. Among them, it is preferable to use a poly-α-olefin such as a PE or PP resin compatible with the polyolefin resin coated on the base paper as another thermoplastic resin. However, "another thermoplastic resin" means that it is a different thermoplastic resin from the polyolefin resin coated on the base paper, and does not prevent its composition from being the same as the polyolefin resin for coating the base paper. is not. An elastic molded article can be formed by using an elastomer resin in combination with the thermoplastic resin.

In the molded article or package of the present invention, the mixing ratio of the cellulose fiber derived from paper and the total thermoplastic resin is as follows:
51:49 or more and 75:25 or less by weight ratio, preferably,
It is 60:40 or more and 70:30 or less.

Polyolefin resin is added to 75 parts by weight of base paper.
In the case where another thermoplastic resin is mixed with the waterproof paper for photographic paper coated with 5 parts by weight, in order for the cellulose component derived from the base paper in the molded article to constitute 51% by weight to 75% by weight of the molded article, In addition, 47 parts by weight to 0 part by weight of another thermoplastic resin is added to 100 parts by weight of waterproof paper for photographic paper.

The antioxidant which can be preferably used in the present invention is a hindered phenolic antioxidant, and a compound having a melting point of 100 ° C. or more, particularly 120 ° C. or more, is preferred. Representative examples of hindered phenols that can be used in the present invention are listed below. 1) 1,3,5-trimethyl 2,4,6-tris (3
5-di-tert-butyl-4-hydroxybenzyl) benzene, 2) tetrakis [methylene-3- (3 ′, 5′-di-te
rt-butyl-4'-hydroxyphenyl) propionate] methane, 3) octadecyl-3,5-di-tert-butyl-4-hydroxy-hydrocinnamate, 4) 2,2 ', 2'-tris [( 3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy]
Ethyl isocyanurate, 5) 1,3,5-tris (4-tert-butyl-3-hydroxy-2,6-di-methylbenzyl) isocyanurate, 6) tetrakis (2,4-di-tert-butylphenyl) )
4,4'-biphenylenediphosphite, 7) 4,4'-thiobis- (6-tert-butyl-o-cresol), 2,2'thiobis (6-tert-butyl-4)
-Methylphenol), 8) Tris- (2-methyl-4-hydroxy-5-tert)
-Butylphenyl) butane; 9) 2,2'-methylene-bis- (4-methyl-6-te
rt-butylphenol), 10) 4,4'-methylene-bis- (2,6-di-tert.
-Butylphenol), 11) 4,4'-butylidene-bis- (3-methyl-6
-Tert-butylphenol), 12) 2,6-di-tert-butyl-4-methylphenol, 13) 4-hydroxymethyl-2,6-di-tert-butylphenol, 14) 2,6-di-tert- 4-n-butylphenol, 15) 2,6-bis (2′-hydroxy-3′-tert)
-Butyl-5'-methylbenzyl) -4-methylphenol, 16) 4,4'-methylene-bis- (6-tert-butyl-o-cresol), 17) 4,4'-butylidene-bis (6 -Tert-butyl-m-cresol), 18) 3,9-bis {1,1-dimethyl-2- [β-
(3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl {2,4,8,10-
Tetraoxaspiro [5,5] undecane 19) 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane

The amount of the hindered phenolic antioxidant added is 0.001 to the total of paper and thermoplastic resin.
To 1.0% by weight, preferably 0.005 to 0.8% by weight, more preferably 0.01 to 0.6% by weight, and most preferably 0.02 to 0.4% by weight. It is preferred to melt-knead and add thermoplastic resin pellets containing concentrated antioxidants, and at the latest add to the mixture of paper and thermoplastic resin before molding. More specifically, it is preferable to add a desired amount to the material supply tank immediately before molding as a concentrated pellet, more preferably, a paper resin pellet and an antioxidant concentrated pellet described below in a hopper installed in a molding machine. Each is metered, kneaded and molded.

The aldehyde neutralizer used in the present invention is represented by the following general formula (1).

Embedded image General formula (1) In the formula, R ¹ , R ² , and R ³ represent a divalent organic radical, each of which is integrated by a covalent bond to form a cyclic imino compound.

The active imino compound represented by the general formula (1) has the following reaction formula since the imino group is rich in reactivity.
As shown in (II), it is considered that cellulose in the paper resin reacts with an aldehyde such as furfural generated by thermal decomposition to form a methylol group.

[0027]

Embedded image R—NH—R ′ + HCHO → R (CH ₂ OH) —R ′ (II)

In order for the imino group to have this reactivity, it is required that the electron concentration of the imino group is sufficiently low to cause an electron nucleophilic reaction. For that purpose, it is necessary that the organic radical chemically bonded directly to the imino group has an electron-withdrawing property. Such organic radicals, that is, the organic radicals represented by R ¹ and R ² in the above general formula (I) have —CO— and —COO at the position where they are bonded to the imino group.
-, - NH -, - NH 2, a phenyl group, a biphenyl group,
Alternatively, it is preferably a naphthalene group.

It is preferred that the aldehyde neutralizer of the present invention does not escape from the molded product after being melt-mixed with the paper resin or cause thermal decomposition. Therefore, the general formula (I)
Preferred examples of the compound represented by are hydantoins, imidazoles and the like, and in the present invention, hydantoins are more preferred. Examples of hydantoins include hydantoin, 5-isopropylhydantoin, 5,5-dimethylhydantoin, 5,5-diphenylhydantoin, allantoin, and the like.
It is not necessarily limited to these.

The antioxidants and neutralizing agents that can be used in the present invention are generally "antioxidants" and "neutralizing agents".
Compounds known as Such antioxidants and neutralizing agents are described, for example, in "Degradation and Stabilization of Polymer Materials" (published by CMC Co., Ltd. in May 1990), edited by Genji Minakawa, "Plastic additive utilization notes" July 5, 1996, published by the Industrial Research Institute.

The organic cyclic compound having an active imino group represented by the general formula (I) is based on the total amount of paper and thermoplastic resin.
0.05 to 3.0% by weight, preferably 0.06 to 2.0
% By weight, particularly preferably 0.067 to 1.0% by weight. The method and timing of addition are the same as those described above for the hindered phenolic antioxidant.

In the molded article of the present invention, it is preferable to use an antioxidant and an aldehyde neutralizer in combination. The addition amounts of these are the same as the addition amounts when used alone. The acid inhibitor of the present invention is added in an amount of 0.05% by weight or more. When 5,5-dimethylhydantoin is used as an aldehyde neutralizing agent, it is preferable to add 0.05% by weight or more.

The thickness of the molded article of the present invention is 0.5 mm or more and 1
0 mm or less, preferably 0.5 mm or more and 5 mm or less, more preferably 0.8 mm or more and 3 mm or less.

FIGS. 1 to 3 show an embodiment of a molded article for a photosensitive material according to the present invention. FIG. 1 shows an instant film pack according to an embodiment of the present invention. The instant film pack includes a case body 1, a film cover 2, a light shielding sheet 4, a light shielding sheet 5, a bottom plate 6, and a flap 7. A resin molded product is used in the above 1 to 6,
The molded article of the present invention can be used for some or all of these components. Then, a photosensitive material package can be formed together with the film 3.

FIG. 2 is a view showing a cushioning material and a package as one embodiment of the present invention used for storing a long roll of photosensitive material disclosed in Japanese Patent Application Laid-Open No. 11-327089. 2 (A) is an exploded perspective view of the package, FIG.
(B) and FIG. 2 (C) are perspective views of the cushioning material as viewed from different directions. The cushioning material 4 is a molded product of the present invention having a thickness of 1.5 mm.

FIG. 3 is a perspective view showing a case body and a lid for Fujicolor SUPERIA (registered trademark of Fuji Photo Film Co., Ltd.) 400 as one embodiment of the present invention.

In FIG. 2, the photosensitive material roll 11 is covered at its outermost periphery with a light-shielding sheet so that the photosensitive material is not exposed or damaged, and both ends in the width direction are exposed or damaged. A light-shielding protection plate 12 is fixed to the paper cylinder 11a so as not to be attached. When the photosensitive material roll 11 is stored in the storage container 13, the photosensitive material roll is deformed and damaged by a physical impact such as dropping, or the light-shielding sheet or the protective plate 12 is damaged and the photosensitive material is exposed to light. The two ends of the paper cylinder 11a of the photosensitive material roll 11 are supported by a pair of cushioning materials 14 and stored in the storage container 13.

The cushioning member 14 is formed on a rectangular substrate 14a made of a synthetic resin, a side wall portion 14b integrally formed on the outer periphery of the substrate 14a, and radially on the front and back of the substrate 14a and in a direction perpendicular to the radial direction. Numerous reinforcing ribs 14c, 14d
And a cylindrical portion 14e formed integrally with the central portion of the substrate 14a and having a closed end, and protrusions 14f extending vertically at four corners of the substrate 14a. The photosensitive material roll 11 is supported by inserting the cylindrical portion 14e of the cushioning material 14 into the paper cylinder 11a.

There are various variations in the method for producing the molded article for photosensitive material of the present invention. The molded article for a photosensitive material of the present invention is preferably made of a waterproofing paper and a thermoplastic resin for a photographic paper in which a base paper produced for a photographic paper is coated with a polyolefin, and a finally obtained molded article for a photosensitive material, The weight ratio of the total thermoplastic resin to the cellulose fiber derived from the base paper is 51:49 to 75:25.
It is characterized in that a molded article for a photosensitive material is formed such that Here, "all thermoplastic resins" means the total of the polyolefin resin that coats the waterproof paper for photographic paper and all the thermoplastic resins added in the manufacturing process.
Here, the lower limit of the composition ratio of the cellulose fiber is 51% by weight.
This is because it is intended to contain cellulose fibers in a proportion exceeding 50% by weight of the whole.

When the thermoplastic resin is first added, it can be selected whether or not only a mixture of cellulose fibers and a polyolefin resin, which is obtained by pulverizing waterproof paper for photographic paper, is once pelletized. An example of a manufacturing process of a molded product in the case where the above-mentioned pellet does not pass through is as follows. (1) a step of pulverizing waterproof paper for photographic paper in which a base paper manufactured for photographic paper is coated with a polyolefin resin to form a mixture of cellulose fibers and a polyolefin resin; (2) if necessary, the resulting mixture Adding another thermoplastic resin which may have been melted, and (3)
Including the base paper and the polyolefin resin, the constituent ratio of the cellulose fibers derived from the base paper to the total thermoplastic resin is 51:
49 to 75: a step of forming a photosensitive material molded article in the range of 25:25.

The following is an example of a process in which only a mixture of cellulose fibers and a polyolefin resin, which is obtained by pulverizing waterproof paper for photographic paper, is once formed into pellets. (1) A step of pulverizing waterproof paper for photographic paper in which a base paper manufactured for photographic paper is coated with a polyolefin resin to form a mixture of cellulose fibers and a polyolefin resin, and (2 ′) pellets from only the obtained mixture. In the same step as once pulverizing the pellets again, or in another step, kneading the pulverized cellulose fiber / polyolefin resin with another thermoplastic resin, and (3) base paper and The composition ratio of the polyolefin resin and another thermoplastic resin to the cellulose fiber derived from the base paper is 5% by weight.
A step of molding a photosensitive material molded article so as to be 1:49 to 75:25. This method is preferred because it improves the compatibility between the cellulose fiber and another thermoplastic resin.

The above steps may be performed as a series of continuous steps, or the mixture or the like obtained in each step may be once taken out and stored. Further, the antioxidant and the aldehyde neutralizer in the present invention are preferably added in the step (3).

A more detailed example of the production process of the photosensitive material molded article of the present invention is as follows. Note that this example of the manufacturing process is hereinafter referred to as “detailed manufacturing process example”. In the description of the embodiments, this “detailed manufacturing process example” will be referred to. (1) A waterproof paper for photographic paper in which a base paper manufactured for photographic paper is coated with a polyolefin resin is roughly pulverized by a shearing machine. In one embodiment, it is cut into square pieces of about 30 x 30 mm. (2) The coarsely crushed waterproof paper is broken into cotton fibers by tearing by a pin mill operation with a pin mill or crushing under friction by a refiner. (3) A mixture of flocculent cellulose fibers having a large bulk specific gravity and a polyolefin resin is compression-kneaded by a pellet mill to form pellets having a reduced volume. (4) The pellets obtained in the above step are subsequently pulverized by a turbo mill. (5) Another thermoplastic resin powder is added to the pulverized cellulose fiber / polyolefin resin mixture and kneaded again by a pellet mill to form pellets. (6) A pellet made of the cellulose fiber, polyolefin resin and another thermoplastic resin obtained in the above step is kneaded with a ruder to obtain a paper resin pellet. (7) The obtained paper resin pellets, antioxidant concentrated pellets and aldehyde neutralizing agent concentrated pellets are supplied to an injection molding machine and injection molded into a desired molded product.

Various modifications can be made to the above steps. For example, in the pulverizing step (4) above,
The pellets obtained in (3) and the mass of another thermoplastic resin may be re-ground together to form a mixture. This mixture can be supplied to the pellet mill of (5).

In order to use the waterproof paper for photographic paper as a raw material, the molded article for a photosensitive material of the present invention can be obtained by homogenizing the crushed polyolefin resin with the crushed cellulose fiber in the step (2) using a refiner or a pin mill. It is thought to be mixed with. For this, the following steps (3) to (5)
It is believed that good mixing of the cellulose fibers, polyolefin resin and another thermoplastic resin obtained through the above process can be achieved.

When the pellets are prepared in (6), the amount of the thermoplastic resin is reduced from the final mixing ratio.
When the pellets are melted and injection molded, insufficient thermoplastic resin can be added for forming the lining layer or the like.
As long as the injection molding is performed so that the composition ratio of the base paper and the total thermoplastic resin in the molded product is 51:49 to 75:25 by weight, the number of intermediate steps of adding the thermoplastic resin and the amount to be added are as follows. You can choose freely. Insufficient thermoplastic resin can be used for lining layer molding by two-color molding or insert molding.

When the composition ratio of the base paper exceeds 75% by weight, the injection pressure increases rapidly, and it becomes difficult to perform injection molding stably. This upper limit is greatly improved by using waterproof paper for photographic paper as compared with a case where only cellulose fibers such as used newspapers are used as a raw material.

In the kneading operation of the step (5) in the above detailed production process example, the moisture content of the cellulose fibers to be kneaded with the thermoplastic resin is preferably 5 to 40% by weight. By maintaining this moisture content, the resin reinforcing function of the cellulosic fiber can be sufficiently exhibited.

A refiner which can be used in the defibration step of the detailed production process example (2) will be described. FIG. 4 is a sectional view showing a fixed disk and a rotating disk as an example of the refiner, and FIG. 5 is a side sectional view of an example of the refiner. In this step, the cellulose fibers of the paper are defibrated and pulverized into flocculent cellulose fibers. As shown in FIG. 4, the refiner is a fixed disk 2 having fixed protrusions 25 arranged on one side of the disk so as to be aligned on a concentric circle A.
3 and a rotating disk 24 on one surface of which the moving projections 26 are arranged in a row on a concentric circle B located between the concentric circles A. As shown in FIG. 5, the fixed disk 23 and the rotating disk 24 face each other, and the fixed protrusion 25 and the movable protrusion 26 are engaged with each other. In this state, the rotating disk 24
Of the fixed projection 2
The WP paper (or waste paper) or the like is crushed by friction between the moving projection 5 and the moving projection 26. In FIG. 5, 28 is a case, and 27 is a mesh drum. Since the WP paper (or waste paper) is frictionally crushed between the fixed protrusion 25 and the movable protrusion 26, the WP paper (or waste paper) is rubbed and loosened between the fixed protrusion 25 and the movable protrusion 26, Fiber cutting is small and can be defibrated sufficiently.

A turbo mill that can be used in the detailed manufacturing process example (4) will be described. FIG. 6 is a vertical longitudinal sectional view of the turbo mill. FIG. 7 shows I, I of FIG.
3 is an enlarged cross-sectional view showing the shape of a blade 31 and a rotor 32 having a triangular cross section in the cross section of FIG. 1) The turbo mill has a cylindrical blade 31 as shown in FIG.
Are provided with a large number of concave grooves 33 having a triangular cross section, and a cylindrical surface of the rotor 32 is provided with convex grooves 34. 2) An air flow with a large flow velocity in the rotation direction of the rotor 32 is generated on the outer periphery of the rotor 32 due to the large number of convexities 34 of the rotor 32 rotating at a high speed. This air flow is compressed when the tip of the ridge 34 of the rotor 32 approaches the ridge 33 provided inside the blade 31 and the ridge 34 of the rotor 32,
When it separates, it expands and generates high-frequency pressure vibration. 3) The pellets supplied from the inlet (not shown) in FIG. 6 are finely pulverized by the above pressure pulverization. 4) The pellets pulverized by the turbo mill are collected by a cyclone bag filter together with air. 5) A desired fiber length can be obtained by controlling the number of times of turbo milling.

For kneading, a known kneading apparatus such as a pressure kneader can be used. Other preferable conditions for the kneading step are described in JP-A-5-50427. The kneading temperature is preferably from 90 ° C. to 220 ° C.
The temperature is particularly preferably from 0 ° C to 170 ° C. 90 kneading temperature
If the temperature is lower than 140 ° C., the kneading temperature tends to be insufficient.
If the ratio exceeds, the decomposition of cellulose becomes intense, so that many components that adversely affect the photosensitive material are generated.

The light-sensitive material package comprises the light-sensitive material molded product obtained by any of the above steps and the light-sensitive material used together therewith. When the photosensitive material molded article is a container, the photosensitive material may be accommodated in the container to form a photosensitive material package.

In order to impart light-shielding properties to the paper resin, a light-shielding substance is added in the range of 0.05 to 25% by weight, so that the photosensitive and photosensitive properties of the paper resin are not impaired. The light-shielding function required for a molded article used around the material can be improved. 0.05% by weight
If it is less than 3, the light-shielding property cannot be ensured, the purpose of addition cannot be achieved, and the cost increases. If it exceeds 25% by weight, the physical strength decreases and the appearance deteriorates.

In the molded article or the molding method of the present invention, a light-shielding substance for imparting light-shielding property to the molded article is 0.05 to 25.
By adding in the range of weight%, a light-shielding function required for a molded article used around the photosensitive material can be imparted without deteriorating the chemical and physical characteristics of the paper resin. If the amount is less than 0.05% by weight, light-shielding properties cannot be secured. If it exceeds 25% by weight, the physical strength decreases and the appearance deteriorates.

The following light-shielding substances are added to ensure light-shielding properties. (1) Inorganic compound A. Oxide silica, diatomaceous earth, alumina, titanium oxide, iron oxide, zinc oxide, magnesium oxide, antimony oxide, barium ferrite, strontium ferrite, beryllium oxide, pumice, pumice balloon, alumina fiber, etc. B. Carbonate Calcium carbonate, magnesium carbonate, dolomite, dawsonite, etc. C. Silicate talc, clay, mica, asbestos, glass fiber, glass balloon, glass beads, calcium silicate, montmorillonite, bentonite, etc. D. Carbon Carbon black, graphite, carbon fiber, carbon hollow sphere, etc. E. FIG. Other Iron powder, copper powder, lead powder, tin powder, stainless powder, pearl pigment,
Aluminum powder, molybdenum sulfide, boron fiber, silicon carbide fiber, brass fiber, potassium titanate, lead zirconate titanate, zinc borate, barium metaborate, calcium borate, sodium borate, aluminum paste,
Talc and the like.

(2) Organic compounds Wood flour (pine, oak, sawdust, etc.), shell fiber (almond,
Peanuts, fir shells, etc.), and various colored fibers such as cotton, jute, paper strip, cellophane strip, nylon fiber, polypropylene fiber, starch, and aromatic polyamide fiber.

There are various forms in which a light-shielding substance is blended.
The concentrated batch method is preferred in terms of cost, prevention of contamination of the work place, and the like. Japanese Patent Publication No. 40-196196 describes a method of preparing a polymer-carbon black masterbatch by dispersing carbon black in a solution of a polymer dissolved in an organic solvent. A method of making a concentrated batch by dispersing carbon black in polyethylene is described. Pellets in which 10% by weight of carbon black is concentrated and filled with respect to the thermoplastic resin can be used. When the molded article of the present invention contains about 0.5% by weight of carbon black, a desired light-shielding property can be obtained.

The carbon black used in the molded article for a light-sensitive material of the present invention does not generate fog on the light-sensitive material, has a large light-shielding ability without increasing or decreasing the photosensitivity, and is used in the resin composition of the present invention. Even when added, it is preferable that the pH is 6.0 to 9.0 and the average particle diameter is 10 to 120 μm, since the generation of carbon black lumps and the occurrence of pinholes due to fish eyes are difficult to occur. Volatile component is 2.0% or less, oil absorption is 50ml / 1
Furnace carbon black of 00 g or more is preferred.
The channel carbon black is expensive and often causes fog on the photosensitive material, which is not preferable. Even if absolutely necessary, the effect on photographic properties should be investigated and selected.

Preferable commercial products of carbon black include, for example, carbon black # 20 manufactured by Mitsubishi Chemical Corporation.
(B), $ 30 (B), $ 33 (B), $ 40 (B),
$ 44 (B), $ 45 (B), $ 50, $ 55, $ 10
0, $ 600, $ 2200 (B), $ 2400 # 950
(B), MA8, MA11, MA100 and the like. Products outside of Japan include, for example, Cabot Bl
ack Pearls 2, 46, 70, 71, 74, 80, 8
1, 607, etc., Regal 300, 330, 400, 66
0, 991, SRF-S, etc., Vulcan 3, 6, etc., Sterli
ng 10, SO, V, S, FT-FF, MT-FF and the like. Furthermore, Printex-Al manufactured by Degussa-Huls
fa, Printex-90 and the like, but are not limited thereto.

The light-shielding substance is added in an amount of 0.05 to 25% by weight, preferably 0.1 to 15% by weight, more preferably 0.5 to 10% by weight, and most preferably 1.0 to 7.0% by weight. % By weight.

Since the molded article according to the present invention has a low melt flow rate (MFR), a lubricant can be added within a range that does not impair the effects of the present invention.

Representative lubricants and manufacturers that can be used in the molded article of the present invention are listed below. (1) Silicone-based lubricant Various grades of dimethylpolysiloxane and modified products thereof (Shin-Etsu Silicone Co., Ltd., Toray Silicone Co., Ltd.). (2) Oleic acid amide lubricant Armoslip CP (Lion Akzo), Neutron (Nippon Seika Co., Ltd.), Neutron E-18 (Nippon Seika Co., Ltd.), Amide O (Nitto Chemical Co., Ltd.) , Alflo E: 10 (Nippon Yushi Co., Ltd.), Diamid O-20
0 (Nippon Kasei Co., Ltd.) and Diamid C-200 (Nippon Kasei Co., Ltd.). (3) Erucamide amide lubricant Alflo-F-10 (Nippon Oil & Fats Co., Ltd.). (4) Stearamide amide lubricant Alflo-S-10 (Nippon Oil & Fats Co., Ltd.), Neutron 2 (Nippon Seika Co., Ltd.), and Diamid 200 (Nippon Kasei Co., Ltd.). (5) Bis fatty acid amide lubricant Bisamide (Nippon Kasei Co., Ltd.), Diamid 200
Screw (Nippon Kasei Co., Ltd.), Armowax BBS (Lion Akzo). (6) Nonionic surfactant-based lubricant Electrostripper TS-2, Electrostripper-TS-3 (Kao Corporation). (7) hydrocarbon lubricant liquid paraffin, natural paraffin, micro wax,
Synthetic paraffin, polyethylene wax, polypropylene wax, chlorinated hydrocarbon, fluorocarbon. (8) Fatty acid-based lubricant Higher fatty acids (preferably C12 or more) and oxy fatty acids. (9) Ester lubricants Lower alcohol esters of fatty acids, polyhydric alcohol esters of fatty acids, polyglycol esters of fatty acids, fatty alcohol esters of fatty acids. (10) Alcohol-based lubricant Polyhydric alcohol, polyglycol, polyglycerol. (11) Metal soap Higher fatty acids such as lauric acid, stearic acid, ricinoleic acid, naphthenic acid, oleic acid and Li, Mg, Ca, S
Compounds with metals such as r, Ba, Zn, Cd, Al, Sn, and Pb.

Preferred embodiments of the molding method of the present invention will be described below. 1) Relationship between Cylinder Temperature and Photographic Properties at the Time of Molding When paper resin pellets are used in the present invention, the cellulose component constituting the paper resin pellets tends to undergo thermal decomposition during molding and deteriorate photographic properties. It is desirable that the temperature be as low as possible. After examining the relationship between cylinder temperature and photographic properties, the cylinder temperature was set to 180 ° C or less,
The temperature is preferably set to 170 ° C. or lower, more preferably 150 ° C. to 170 ° C. 2) Relationship between MFR of resin added to paper resin pellets and moldability Paper resin pellets produced from WP paper have poor moldability due to the relatively long fiber length. Therefore, if the flow of the mixed resin is poor, the molded product becomes a short shot. As a result of studies by the present inventors, the MFR of the resin to be mixed is preferably 15 g / 10 min or more, more preferably 30 g / 10 min or more, and still more preferably 45 to 80 g / g, in consideration of the limit of sink of the molded product (dent of the molded product). 10 min is most preferred.

The molded article for a light-sensitive material of the present invention is, for example, shown in FIG. An instant film pack (a film pack for a card-sized instant film intax mini (registered trademark) manufactured by Fuji Photo Film Co., Ltd. (a black container having a thickness of 0.9 mm));
Also, it can be used as a moisture-proof container (including a lid) for a 135 standard film cartridge illustrated in FIG. Other molded articles of the present invention include 135-standard spools, APS-standard film magazines, 110-standard film cartridges, rectangular magazines for storing photosensitive materials for printing, paper tubes for winding long photosensitive materials, and long paper tubes. A flange for winding the photosensitive material from both sides, a cushioning material to be placed in a container of the photosensitive material, a contact ball for the photosensitive material laminate (a package or a package part that comes into contact with the photosensitive material laminate),
It can be applied to a container for a film with a lens (Fuji Photo Film Co., Ltd., registered trademark "Sharun").

Preferred embodiments of the method for producing a photosensitive material molded product, a photosensitive material package, and a photosensitive material molded product described in Means for Solving the Problems will be described below. 1. A molded article for a photosensitive material containing a hindered phenolic antioxidant as an antioxidant in an amount of 0.01 to 0.5% by weight of the molded article. 2. A molded article for a photosensitive material containing a hydantoin compound as an aldehyde neutralizer in an amount of 0.05 to 0.5% by weight of the molded article. 3. The weight ratio of the cellulose fiber having a weight average fiber length in the range of 0.30 mm or more and 0.50 mm or less after pulverizing the base paper made by the kraft pulp and the total thermoplastic resin is 51:49 or more and 75:49 by weight ratio. Molded articles for photosensitive materials, wherein the molded articles are 25 or less. 4. A molded article for a photosensitive material, wherein the molded article has a thickness of 0.5 mm or more and 10 mm or less. 5. After crushing waterproof paper for photographic paper obtained by coating polyolefin resin on base paper manufactured for photographic paper to form a mixture of cellulose fibers and polyolefin resin, another thermoplastic resin is added to the mixture as necessary. And a base paper and a polyolefin resin, wherein the total composition ratio of the polyolefin resin and another thermoplastic resin to cellulose fibers derived from the base paper is a molded product having a weight ratio of 51:49 or more and 75:25 or less. 6. A light-sensitive material package containing a hindered phenol-based antioxidant as an antioxidant in an amount of 0.01 to 0.5% by weight of a molded article. 7. A light-sensitive material package containing a hydantoin compound as an aldehyde neutralizing agent in an amount of 0.05 to 0.5% by weight of the molded product. 8. The weight ratio of the cellulose fiber having a weight average fiber length in the range of 0.30 mm or more and 0.50 mm or less after pulverizing the base paper made by the kraft pulp and the total thermoplastic resin is 51:49 or more and 75:49 by weight ratio. A photosensitive material package which is a molded product of 25 or less. 9. A photosensitive material package having a molded product having a thickness of 0.5 mm or more and 10 mm or less. 10. After crushing waterproof paper for photographic paper obtained by coating polyolefin resin on base paper manufactured for photographic paper to form a mixture of cellulose fibers and polyolefin resin, another thermoplastic resin is added to the mixture as necessary. A photosensitive material package comprising a base paper and a polyolefin resin, wherein the total composition ratio of the polyolefin resin and another thermoplastic resin to cellulose fibers derived from the base paper is 51:49 to 75:25 by weight. 11. A method for producing a molded article for a photosensitive material having a melt flow rate of 30 g / 10 min or more. 12. A method for producing a molded article for a photosensitive material, wherein a concentrated pellet of an antioxidant and a concentrated pellet of an aldehyde neutralizer are supplied to a molding machine together with paper resin pellets.

[0066]

EXAMPLES Hereinafter, specific examples of the present invention will be described together with comparative examples, but the present invention is not limited to these examples.

(Example 1) A case of InStack Mini (registered trademark of Fuji Photo Film Co., Ltd.) was manufactured according to the above detailed manufacturing process example. A photographic paper waterproof paper scrap consisting of 25% by weight of PE laminated on both sides with a photographic paper base paper weight of 75% was roughly pulverized, defibrated by a refiner, pelletized once, and then pulverized using a turbo mill. A concentrated batch of carbon black and HDPE were added to form paper resin pellets. To this paper resin pellet, a concentrated pellet of an antioxidant and a concentrated pellet of a neutralizing agent were added, and an Instack Mini case was injection-molded with a molding thickness of 0.8 mm. As an antioxidant, ADK STAB AO-30 (1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane) manufactured by Asahi Denka Kogyo KK was used. Mitsui Chemicals Co., Ltd.
5,5-dimethylhydantoin was used. Samples A to J were produced by changing the weight ratio of the cellulose fiber derived from paper to the total thermoplastic resin, the added amounts of the antioxidant and the neutralizing agent, and the molding temperature as shown in Table 1. Other manufacturing conditions are described below.

[0068]

[Table 1]

The above samples were comprehensively evaluated on the basis of moldability (injection pressure), burning during molding, photographic properties, appearance of molded articles, and the like. Table 2 shows the results. The photographic properties were evaluated by measuring the change in fog density (ΔD _max ). ΔD _max is ΔD _max = _{M b} -
Is a value obtained from the M _{t, M t} is manufactured by Fuji Photo Film Co., Ltd. in Stacks housing mini sensitive material A~J case, sealed, 50 ° C., was stored for 3 days in an atmosphere of RH 60% The maximum density value of blue when standard development processing is performed later is shown. M _b is housing the light-sensitive material in a case made of thermoplastic resin, sealed, showing the obtained values. The same applies to the second and third embodiments.

[0070]

[Table 2] * 1 If the injection pressure exceeds 9.0 MPa, molding cannot be performed. * 2, 3 ○: practically, no problem △: barely practical ×: practical, problematic ※ 4, 5 ○: effective △: slightly effective ×:
No effect * 6 ○: Practical, no problem, and feasible △: Barely feasible, ×: Practical problem, feasible

From these results, the following has been found. (1) When the weight ratio of the cellulose fiber derived from paper and the total thermoplastic resin exceeds 75:25, the injection pressure increases and molding becomes impossible. (2) Antioxidant and aldehyde neutralizing agent in 0.01 to
By adding 0.5% by weight, thermal decomposition of the cellulose fiber can be suppressed. (3) The addition amount of the antioxidant and the aldehyde neutralizer is 0.
If the content exceeds 5% by weight, poor appearance occurs.

Example 2 1) Broadleaf bleached kraft pulp (L) having a weight-average fiber length of 0.7 mm measured by an FS-100 measuring machine manufactured by Kajaani
BKP), a photographic paper waterproof paper obtained by coating a base paper produced on a photographic paper with a polyolefin resin was used as a raw material.
This waterproof photographic paper is made of 75 parts by weight of base paper and 25 parts of PE resin.
It was waterproof paper that was weight laminated. 2) This photographic paper waterproof paper was coarsely pulverized by a shearing machine. 3) The coarsely crushed waterproof paper was crushed by a pin mill into tear-like cellulose fibers. 4) Pellets formed by compression-kneading flocculent cellulose fibers having a large bulk specific gravity by a pellet mill. 5) 52 parts by weight of Idemitsu Petroleum PP resin PJ68083HP was added to 100 parts by weight of the obtained pellets, and ADK STAB AO-30 (1,1,3-) manufactured by Asahi Denka Kogyo KK as an antioxidant.
0.2% by weight of tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane) 0.2% by weight of 5,5-dimethylhydantoin manufactured by Mitsui Chemicals, Inc. as a neutralizing agent, carbon black Mitsubishi Kasei Co., Ltd. # 950 0.
5% by weight was added to obtain a sample. The sample was pulverized using the turbo mill while changing the number of treatments as shown in Table 3.

7) Pulverize the sample at cylinder temperature 1
The mixture was kneaded and granulated with a 70 ° C. ruder to obtain paper resin pellets. 8) Using each of the paper resin pellets, an instant film pack having a thickness of 1 mm was formed to obtain a pack sample. The molding conditions are as follows: Sumitomo SG180 molding machine, resin temperature 170
° C and a mold temperature of 70 ° C. 9) The maximum injection pressure during molding, the weight-average fiber length of cellulose contained in the molded product, the drop strength, and the photographic properties when combined with an instant film were evaluated. Table 3 shows the evaluation results.

[0074]

[Table 3] * 1 In JIS Z0200 Level IV ○: No problem △: Slight crack at corner of molded product * 2 ○: Practical without practical problem △: Barely practical ×: Practical problem, practical impossible

From these results, the following has been found. (1) The weight average fiber length changes depending on the number of times of the turbo mill treatment. (2) If the weight average fiber length exceeds 0.5 mm, the compatibility with the resin is reduced, and the flow of the paper resin is poor during molding, and short shots are generated. (3) If the weight-average fiber length is less than 0.3 mm, thermal decomposition of cellulose is likely to occur, and aldehydes are generated, resulting in poor photographic properties.

(Example 3) In Example 2, the amount of the neutralizing agent added was changed as shown in Table 4, and the mixture was treated once with a turbo mill and then subjected to a ruder treatment to obtain paper resin pellets.

Using the above paper resin pellets, an instant film pack was molded under the same molding conditions as in Example 3, and the odor due to a small amount of aldehyde generated by thermal decomposition during molding and the photographic properties after film loading were evaluated. The odor was evaluated by 10 randomly selected persons according to the following evaluation criteria and expressed as an average value. Samples of molded articles were designated FL. Odor intensity Odor sensation intensity 5 Odorless 4 Smell that is barely faint (detection threshold) 3 Weak smell that feels easy 2 Odor that feels clearly 1 Strong smell 0 Odor that feels unbearably strong Odor level of 4 or more There is no problem in practical use.

[0078]

[Table 4] * 1 ◎ ○: Practical, no problem, workable ×: Practical, workable

Example 4 In the same manner as in Example 1, the photographic film storage case shown in FIG. 3 was molded by an injection molding method, and samples shown in Table 5 were obtained. The thickness of the photographic film storage case was 0.8 mm, and molding was performed at 170 ° C. cylinder temperature using Sumitomo Heavy Industries SG180 as a molding machine. The sample No. In both cases 1 and 2, the storage case was formed using base paper having a weight average fiber length of 0.3 mm of the crushed cellulose fiber. The weight ratio of the cellulose fiber to the total thermoplastic resin of the molded article was 51:49, the antioxidant content was 0.3% by weight, and the aldehyde neutralizing agent content was 0.3% by weight. The evaluation of photographic properties was performed by measuring the change in fog density (ΔD _min ). ΔD
_min is a value determined from _{ΔD min = M t -M b,} M t is manufactured by Fuji Photo Film Co., Ltd. housed color negative films SUPERIA 400 to 1 or 2 of the case, and sealed, 50 ° C., 60% RH Shows the lowest density value of blue when standard development processing is performed after storage for 3 days in an atmosphere of. M _b is housing the film case formed of a thermoplastic resin, sealed, showing the obtained values.

[0080]

[Table 5] * 1 Idemitsu Oil 100J * 2 Nippon Polyolefin KMA90K * 3 ○: Good

(Example 5) Reinforcement ribs in the cushioning material shown in FIG. 2 were manufactured according to the above-described detailed manufacturing process example. The photographic paper waterproof paper scraps composed of 25% by weight of PE laminated on both sides of 75% by weight of the photographic paper base paper were roughly pulverized, defibrated by a refiner, pelletized once, and then crushed using a turbo mill. A concentrated batch of carbon black and HDPE were added to form paper resin pellets. A concentrated rib of an antioxidant and a concentrated pellet of a neutralizing agent were added to the paper resin pellet, and a reinforcing rib having a thickness shown in Table 6 was injection-molded. Sumitomo Heavy Industries SG75 was used as a molding machine. As the antioxidant, ADK STAB A of Asahi Denka Kogyo Co., Ltd.
O-30 (1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane) was used. As a neutralizing agent, Mitsui Chemicals' 5,5-
Dimethylhydantoin was used. Table 6 shows the weight ratio of the paper-derived cellulose fibers to the total thermoplastic resin, the amounts of the antioxidants and the neutralizing agents added, and the molding temperature.

[0082]

[Table 6]

The above samples were comprehensively evaluated on the basis of moldability, burning during molding, photographic properties, appearance of molded articles, and the like. Table 7 shows the results. The photographic properties were evaluated by measuring the change in fog density (ΔD _min ). [Delta] D _min is a value determined from _{ΔD min = M t -M b,} M t is manufactured by Fuji Photo Film Co., Ltd.
The S-FA100 printing material is stored in a case using a buffer material of 3 to 7, sealed, and stored in an atmosphere of 50 ° C. and 60% RH.
Indicates the minimum density value of blue when standard development processing is performed after storage for days. M _b is housing the printing sensitive material in a case made of thermoplastic resin, sealed, showing the obtained values.

[0084]

[Table 7] * 1 ○: Good molding ×: Unable to mold ※ 2, 3 ○: Practical, no problem ×: Practical, problem ※ 4, 5 ○: Effective ×: No effect * 6 Drop test is JIS Z0202 Level II It went according to. ：: Good * 7 ◎ ○: No problem in practical use and possible ×: Positive in practical use and impossible

[0085]

(1) The molded article of the present invention has excellent mechanical properties without deteriorating photographic properties. In addition, the proportion of the cellulose fibers in the molded product exceeds 50% by weight, and when disposed, the environmental load is small. (2) The uncoated photographic paper scraps and the like generated in the production of photographic paper can be effectively reused as photosensitive material packaging materials and functional parts by effectively utilizing the scraps. (3) By using an antioxidant and an aldehyde neutralizing agent and molding at a low cylinder temperature of about 170 ° C., a container with good storability that does not degrade the photographic properties of the stored photosensitive material is manufactured. be able to.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a photosensitive material molded product according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram of one embodiment of a molded article for a photosensitive material of the present invention. FIG. 2A is an exploded perspective view of the package, and FIG.
(B) and FIG. 2 (C) are perspective views of the cushioning material viewed from different directions.

FIG. 3 is a perspective view of a photosensitive material molded product according to one embodiment of the present invention, which is a container in which a body and a lid are integrally molded.

FIG. 4 is a cross-sectional view showing a fixed disk and a rotating disk as an example of a refiner that can be used in the defibration step in the method for producing a molded article for a photosensitive material of the present invention.

FIG. 5 is a side sectional view of an example of a refiner that can be used in the defibration step in the method for producing a molded article for a photosensitive material of the present invention.

FIG. 6 is an example of a crusher used in a coarse crushing step in the method for producing a molded article for a photosensitive material of the present invention.

FIG. 7 is an example of a crusher used in a coarse crushing step in the method for producing a molded article for a photosensitive material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main body 2 Film cover 3 Film 4, 5 Light shielding sheet 6 Bottom plate 7 Exit light shielding flap 11 Photosensitive material roll 11a Paper cylinder 12 Protective plate 13 Storage container 14 Buffer material 14a Substrate 14b Side wall part 14c, 14d Reinforcement rib 14e Cylindrical part 14f Projection Part 23 fixed disk 24 rotating disk 25 fixed protrusion 26 moving protrusion 27 mesh drum 28 case 31 blade 32 rotor 33 concave 34 convex

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03C 3/00 G03C 3/00 560F 560L 560N 560P 560Q 560S 560Z 580 580A 590 590H B29B 9/12 ZAB B29B 9 / 12 ZAB B29C 45/74 B29C 45/74 B65D 65/02 B65D 65/02 E 77/00 77/00 B 81/30 81/30 B (72) Inventor Taro Yamamoto 210 Nakanuma, Minamiashigara-shi, Kanagawa Prefecture Fuji Photo Film In-house F term (reference) 3E067 AA16 AB39 AC01 AC18 BA02A BA05A BB03A BB14A BC03A BC06A CA12 CA30 EA18 EA32 EB27 EC01 ED08 FA01 3E086 AD05 AD06 BA04 BA15 BA28 BA29 BB22 BB90 CA40 DA08 4F201 AA03 BC03 BC06 AD06 BC03 BL44 4F206 AC01 AH81 AR17 AR18 JA07 JD03 JF01 JF21 J L02 JM01 JN01 JN03 JN43 JQ46

Claims (3)

[Claims] 1. A molded article in which the weight ratio of cellulose fiber derived from paper to total thermoplastic resin is 51:49 or more and 75:25 or less, wherein at least one kind of antioxidant and aldehyde neutralization are provided. A molded article for a photosensitive material, characterized by containing at least one agent. 2. A molded article having a weight ratio of cellulose fiber derived from paper to total thermoplastic resin of 51:49 or more and 75:25 or less, wherein at least one kind of antioxidant and aldehyde neutralization are used. A molded article for a photosensitive material containing at least one kind of agent and a photosensitive material used together with the molded article for a photosensitive material. 3. A base paper produced for photographic printing paper is pulverized, compression-granulated pellets and a melt flow rate of 15%.
g / 10 min or more of a thermoplastic resin and paper 51-75.
A photosensitive resin material characterized by comprising, in this order, a step of mixing the components by weight so as to have a composition ratio of 49 to 25 parts by weight of the total thermoplastic resin and a step of molding the mixture with a molding machine at a cylinder temperature of 180 ° C. or lower. Manufacturing method of molded article.