JPH02310556A - Production of container for photographic sensitive material - Google Patents

Abstract

PURPOSE:To obtain the container for photographic sensitive materials which does not produce the fine powder deposits of resin additives on films and does not flaw the inside of the container by using a polyolefin resin contg. fatty acid amide and fatty acid monoglyceride which is liquid or semi-solid soln. at ordinary temp. (23 deg.C) and molding the container of this resin. CONSTITUTION:The container is molded by using the polyolefin resin contg. the fatty acid amide and the fatty acid monoglyceride which is liquid or semi- solid soln. at ordinary temp. (23 deg.C). The amt. of the fatty acid amide to be added is determined by the kind of the container and the kind of the polyolefin resin. All kinds of the fatty acid monoglyceride are usable if the fatty acid monoglyceride is liquid or semi-solid soln. at ordinary temp. (23 deg.C). The fatty acid monoglyceride constitutes the liquid or grease-like lubricative semi-solid soln. film having slipperiness on the surface of the container, thus suppressing the sticking amt. of the white powder to a lower level. The container for photographic sensitive materials which is less tuck with the white powder while well maintaining the moldability and blocking property, etc., of the container is produced in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing containers for photographic light-sensitive materials, such as plastic containers for accommodating photographic film cartridges.

[Conventional technology]

Conventionally, a container for a photographic film cartridge is constructed by attaching a container cap to a container body, as shown in FIG.

In FIG. 1, reference numeral 1 is a photographic film cartridge main body, and reference numeral 2 is a photographic film cartridge container cap that fits into the photographic film cartridge container main body. The photographic film cartridge container body 1 has a bottom 3
It is formed into a bottomed cylindrical shape consisting of a peripheral wall portion 4 and a peripheral wall portion 4.
A fitting groove 5 is formed in the upper part of the inner surface. In addition, the photographic film cartridge container cap 2 has a fitting groove 5.
A protrusion 6 is formed which fits into the ridge.

By the way, most of these containers for photographic film cartridges are manufactured by injection molding, and the resin used for this injection molding has good transparency and is suitable for products, does not whiten even when subjected to impact, and is resistant to impact. High strength is desired, and for example, a propylene-ethylene random copolymer resin in which propylene is copolymerized with ethylene, as disclosed in JP-A No. 63-193142, is used.

In such resins, fatty acid amide lubricants, such as polyolefin resins, contain about 0.05 to 0.05 to oleic acid amide, etc., in order to improve resin fluidity, mold release properties, and prevent blocking of molded products. It is added in a range of 0.3% by weight.

[Problem to be solved by the invention]

Incidentally, the lubricant in the molded product bleeds over time after molding, crystallizes, becomes a fine powder, and comes to cover the surface of the molded product. The fine powder acts as a solid lubricant, making the surface of the molded product slippery, and preventing molded products from blocking each other in a silo where molded products are accumulated. The lubricant on the outer surface of the photographic film cartridge container body is
It works effectively as described above.

However, since the inner surface of the container is in contact with the cartridge and a part of the film leader that protrudes a certain length from the cartridge, when the container is subjected to vibration during the film manufacturing process and transportation, the lubricant that bleed into the film leader becomes white. This lubricant, which is in powder form and adheres to the film leader, may adhere to the optical path of the camera when the film is loaded into the camera, or may adhere to the film during shooting, causing problems that may affect the resulting photographs. there were.

On the other hand, if no lubricant is added, the fluidity of the resin is poor, leading to longer molding cycles, poor mold release during molding, and other problems such as poor moldability, as well as poor slippage of the molded product. This not only causes problems in handling the container during the manufacturing process, but also damages the inside of the container due to the edges of some of the film leaders and perforation edges of the cartridges that are housed in it, and also generates resin powder. There was a problem in that the film was made to adhere to the film.

Silicone oil is a lubricant that does not generate white powder, but it must be added in an amount of at least 0.5% by weight in order to produce a slipping effect, which results in cloudiness.
It could not be used because it impeded transparency and impaired its function as a container body for photographic film cartridges.

The present invention solves the above-mentioned problems, maintains moldability and prevents blocking of molded products, does not cause fine powder deposits of resin additives on the film inside the container, and also An object of the present invention is to provide a method for manufacturing a container for a photographic light-sensitive material, which can produce a container for a photographic light-sensitive material that does not cause any damage.

[Means to solve the problem]

The present invention has been made to achieve the above objects,
This was achieved by adding fatty acid amide and fatty acid monoglyceride together to the molding resin.

That is, the method for manufacturing a container for photographic material of the present invention includes:
It is characterized by being molded using a polyolefin resin containing a fatty acid amide and a fatty acid monoglyceride that is in liquid or semi-solid solution form at room temperature (23° C.).

As the fatty acid amide, various conventionally used fatty acid amides can be used, but oleic acid amide and erucic acid amide are particularly preferred.

Examples of lubricants using fatty acid amides are described below.

(1) Oleic acid amide lubricant: Armosphilip CP (Lion Akzo), Neutron (Japan Sekihi), Amide O (Kao), Alf oE
-10 (NOF), DIAMIT 0-200 (Nippon Kasei), DIAMIT G-200 (Nippon Kasei), etc. (2) Erucic acid amide-based lubricant; Alflow P-10 (NOF), etc. (3) Stearic acid amide-based Lubricants; Alflo S-10 (Nippon Oil & Fats), Neutron 2 (Nihon Kasei), Diamond 200 (Nippon Kasei), etc. (4) Bis fatty acid amide lubricants; Bisamide (Nippon Kasei), Diamond 200 Bis(
Nippon Kasei), Armowax EBS (Lion Akzo), etc.

The amount of the fatty acid amide added is determined depending on the type of container for photographic material and the type of polyolefin resin. For example, when molding a photographic film cartridge container using propylene-ethylene random copolymer resin, 0.05 to 0.0
．． 3% by weight is preferred, particularly 0.1-0.2% by weight.

As the fatty acid molyglyceride, any fatty acid monoglyceride can be used as long as it is in a liquid or semi-solid solution state at room temperature (23° C.), and oleic acid monoglyceride and erucic acid monoglyceride are particularly preferred.

The amount of fatty acid monoglyceride added is preferably from the same amount to three times the amount of fatty acid amide added.

If the amount of fatty acid monoglyceride added is less than the amount of fatty acid amide added, white powder and scratches cannot be completely prevented, and if it exceeds three times the amount, lubricity decreases and costs increase.

Various polyolefin resins can be used as the polyolefin resin depending on the type of container for photographic material.
For example, propylene-ethylene random copolymer resin,
They are propylene-ethylene block copolymer resin, polyethylene resin, and ethylene copolymer resin.

How to add fatty acid amide and fatty acid monoglyceride:
Conventional methods can be used, such as adding it during resin polymerization, mixing it with resin pellets and kneading it in a kneader, or making M/B lubricant pellets and mixing them with the resin pellets during molding.

In addition, other additives may be used within a range that does not impair the effects of the present invention.
For example, a light-shielding substance, a nucleating agent, an antistatic agent, and an antioxidant can be added.

Examples of light blocking substances are described below.

(1) Inorganic compounds A, oxides: silica, diatomaceous earth, alumina, titanium oxide, iron oxide, zinc oxide, magnesium oxide, antimony oxide, barium ferrite, strontium ferrite, beryllium oxide, pumice, pumice balloon, alumina Fibers etc. B, hydroxides...aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate C1 carbonate...calcium carbonate, magnesium carbonate,
Dolomite, dawsonite, etc., (sulfite)...calcium sulfate, barium sulfate, ammonium sulfate, calcium sulfite, etc.E, silicates...talc, clay, mica, asbestos, glass fiber, glass balloon, glass peas, Calcium silicate, montmorillonite, bentonite, etc.F, carbon...carbon black, graphite, carbon fiber, carbon hollow sphere, etc.G, others...molybdenum sulfide, poron fiber, silicon carbide fiber, brass fiber, potassium titanate, titanium Lead acid zirconate, subsium borate, barium metaborate, calcium borate, sodium borate, aluminum paste, talc, etc. (2) Organic compound wood flour (pine, oak, sawdust, etc.), shell fiber (almond, peanut, (rice husks, etc.), cotton, jute, paper strips, cellhaf strips, nylon fibers, polypropylene fibers,
Examples of antistatic agents such as starch and aromatic polyamide fibers are described below.

■Nonionic surfactant (typical component: polyoxyethylene glycols) ■Anionic surfactant (typical component: polyoxyethylene glycol H) ■Cationic surfactant (typical component: quaternary ammonium salt) ■Ampholytic interface Activator ■ Alkylamine derivative ■ Fatty acid derivative ■ Various lubricants ■ Carbon black, graphite ■ Carbon fiber [phase] Metal fiber ■ Whisker (potassium titanate, alumina nitride, alumina) Examples of antioxidants are described below.

(a) Phenolic antioxidant 6-t-butyl-3-methylphenyl derivative, 2.6
-di-butyl-P-cresol-t-butylphenol), 2,2°-methylenebis-(4-ethyl-6-L-
butylphenol), 4,4°-butylidene bis(6-
t-butyl-m-cresol), 4,4”-thiobis(
6-L-butyl-m-cresol), 4,4-dihydroxydiphenylcyclohexane, alkylated bisphenol, styrenated phenol, 2,6-di-butyl-4-methylphenol, n-octadecyl-3-(3
', 5'-di-mobutyl-4'-hydroxyphenyl)propinate, 2,2'-methylenebis(4-methyl-6-butylphenol), 4,4'-thiobis(
3-methyl-6-t-butylphenyl), 4.4゛-
phthylidene bis(3-methyl-6-butylphenol), stearyl-β(3,5-di-4-butyl-4-
Hydroxyphenyl) propionate, l.1.3-tris(2-methyl-4hydroxy-5-t-butylphenyl)butane, ■.3.5 trimethyl-2.4.6 to tris(3.5-di monobutyl-4hydroxybenzyl)benzene, tetrakis[methylene-3(3゛・5°-
Di-t-butyl-4'-hydroxyphenyl)propionate comethane, etc. (b) Ketone amine condensation antioxidant 6-nitoxy 2,2,4-trimethyl-1,2-dihydroquinoline, 2,2,4- Polymers of trimethyl-1,2-dihydroquinoline, trinotyldihydroquinoline derivatives, etc. (c) Allylamine antioxidants phenyl-α-naphthylamine, N-phenyl-β-naphthylamine, N-phenyl-N゛-isopropyl-P
-phenylenediamine, N-N''-diphenyl-P-phenylenediamine, N-N'-di-β-naphthyl-P-
(ii) Imidazole antioxidants such as phenylenediamine, N-(3'-hydroxybutylidene)-1-naphthylamine, etc. 2-mercaptobenzimidazole, zinc salt of 2-mercaptobenzimidazole, 2-mercaptomethylbenzimidazole, etc. ) Phosphite-based antioxidants Alkylated allyl phosphite, diphenylisodecylphosphite, tris(nonylphenyl)phosphite Sodium phosphite, trinonylphenylphosphite, triphenylphosphite, etc. (to) Thiourea-based antioxidants (g) Other antioxidants useful for air oxidation (h) Sulfur-based antioxidants dilauryl thiodipropionate, simiristyl, etc. Thiodipropionate, laurylstearylthiodipropionate, distearylthiodipropionate The method for producing containers for photographic materials of the present invention can be applied to all containers for photographic materials in which white powder of fatty acid amide is a problem. . Examples include a container body for a photo cartridge, a cap for the same, and a magazine.

[Effect]

In the method for producing a container for photographic light-sensitive materials of the present invention, the fatty acid monoglyceride forms a slippery film on the surface of the container for photographic light-sensitive materials in the form of a liquid or a semi-solid solution like a grease-like lubricant, thereby suppressing the amount of white powder adhesion. .

〔Example〕

Propylene and ethylene random! Add and mix oleic acid amide and oleic acid monoglyceride (trade name Excel 300 manufactured by Kao) to BFi for coalescence (trade name J952 manufactured by Mitsui Petrochemicals) in the predetermined amounts shown in Table 1,
After that, the test resin (a, b, c, d, e, f
, g) was obtained.

In addition, a test resin in which only oleic acid amide was added and mixed with the propylene-ethylene random copolymer resin
h, i, j,) were obtained, and a test resin (k) was obtained by adding and mixing only the above oleic acid monoglyceride to the above propylene-ethyrandom copolymer resin.

Then, a photographic film cartridge container body was molded by injection molding using these test resins.

The following tests were conducted on the photographic film cartridge container body described above.

Lubricant adhesion test/scratch test Seven days after molding into the photographic film cartridge container body, photographic film with no lubricant attached (SHR10036EX)
(manufactured by Fuji Photo Film) and put it through a vibration tester.
Vibrate for a minute. After the vibration, the photographic film was taken out from the photographic film cartridge container body and visually inspected for lubricant adhesion to the film leader and flaws inside the photographic film cartridge container body.

The lubricant adhesion evaluation is as follows.

O: No white powder observed Δ: Some white powder is observed. ×: White powder is clearly observed The evaluation of scratches is as follows.

○: No scratches Δ: Some scratches ×: Clear scratches Sliding test The photographic film cartridge container body 24 or 96 hours after molding was used as shown in Figure 2. As shown in FIG.
Place the container body 1 containing the weight (in the shape of stacked bales),
The base plate 7 was gradually tilted, and the angle at which the container body 1 started to slide was measured, and the static FJ friction coefficient was determined from this angle.

The results are shown in Table 1.

From the results shown in Table 1, test resin (h) is unsuitable in terms of scratches, and test resins (i) and (j) are unsuitable in terms of lubricant adhesion. In addition, test resin (k) is unsuitable because it has poor slippage after 24 hours and limits the number of days it can be supplied to the film manufacturing process.

On the other hand, test resins (a to g) had no problems with lubricant adhesion, scratches, and slippage within acceptable ranges or at all.

Regarding transparency, all test resins (a-k
) there were no problems.

In addition, in the above examples, propylene-ethylene random copolymer resin was used as the polyolefin resin, oleic acid amide was used as the fatty acid amide, and oleic acid monoglyceride was used as the fatty acid monoglyceride.
Similar results were obtained using other polyolefin resins, fatty acid amides, and fatty acid monoglycerides.

〔Effect of the invention〕

By configuring the present invention as described above, it is possible to manufacture a container for a photographic material, which maintains good moldability, blocking properties, etc. of the container for a photographic material, and has an extremely small amount of white powder adhesion. Therefore, good measures can always be taken.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a photographic film cartridge container, and FIG. 2 is a diagram showing the method of a slip test.

Claims (1)

[Claims] A method for producing a container for a photographic material, characterized in that it is molded using a polyolefin resin containing a fatty acid amide and a fatty acid monoglyceride that is in liquid or semi-solid solution form at room temperature (23°C).