JPH02221957A - Main body of container for photographic film cartridge - Google Patents

Abstract

PURPOSE:To sufficiently enhance impact strength and rigidity of the main body of the container and to prevent occurrence of a white powder by forming the main body with a specified polypropylene type resin composition. CONSTITUTION:The main body of the container for photographic film cartridge is made of the composition containing a >=0.005wt.% lubricant, a homopolymer of polypropylene and a propylene-ethylene copolymer in a weight ratio of 5:95-95:5, and having a melt index of 10-60g/10min, a modulus of bending elasticity of >=9,000kg/cm<2>, a notched Izod impact strength of >=2.5kg.cm/cm at 23 deg.C, and a Rockwell hardness of >=85R. The composition can contain a desired nucleator for enhancing crystallization speed and preventing occurrence of a white powder, and a coupling agent, an antioxidant, and a surfactant for preventing a malodor of an organic nucleator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a main body of a container for storing a photographic film cartridge.

[Conventional technology]

Conventionally, there has been a container for photographic film cartridges as shown in FIG.

In FIG. 1, reference numeral 1 denotes a photographic film cartridge container body, and reference numeral 2 denotes a photographic film cartridge container cap that fits into the photographic film cartridge container body. The photographic film cartridge container body 1 is formed into a bottomed cylindrical shape consisting of a bottom portion 3 and a peripheral wall portion 4, and a fitting groove 5 is formed in the upper inner surface of the peripheral wall portion 4. Further, the photographic film cartridge container cap 2 is formed with a protrusion 6 that fits into the fitting groove 5.

The present inventor developed a container body for such a photographic film cartridge using a polypropylene resin having a content of propylene units of 70% by weight or more and a melt index of 16 to 80 g/10 min. 60-16
3045, and the content of propylene units is 70% by weight or more and the melt index is 16.
JP-A-61-73947 discloses a method using a polypropylene resin of ~80 g/10 min.

[Problem to be solved by the invention]

Although the conventional photographic film cartridge container body described above has sufficient impact strength, etc., it is prone to deformation of the mouth, buckling, etc., and when a large amount of additives are added to eliminate these defects, The agent bleeds out and white powder is often produced.

In addition, the main body of a photographic film cartridge made of homopolypropylene resin can be made highly rigid and prevent the occurrence of mouth deformation, buckling, etc., but its impact strength is weak and cracks and cracks occur when dropped. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a container body for a photographic film cartridge that has sufficiently high impact strength and rigidity and generates less white powder.

[Means to solve the problem]

The present invention has been made to achieve the above objects,
It was completed by balancing the blend of homopolypropylene resin and propylene/ethylene copolymer resin.

That is, the photographic film cartridge container body of the present invention contains a lubricant of 0.005% by weight and a ratio of homopolypropylene resin and propylene/ethylene copolymer resin of 5:95.
Contains at a ratio of ~95:5, melt flow index is 10 to 60 g/10 minutes, and flexural modulus is 9000 Kg/c
gi' or higher, a notched Izot impact strength at 23° C. of 2.5 kg-cta/cts or higher, and a Rockwell hardness of 85 R or higher.

The polypropylene resin composition is 5:95 to 9 of homopolypropylene resin and propylene/ethylene copolymer resin.
Contains at a ratio of 5:5.

Homopolypropylene resin is less than 5, that is, propylene
When the ethylene copolymer resin exceeds 95, the container body has high rigidity and high impact strength, has a high degree of crystallinity, is less likely to cause lip deformation or buckling, and has less bleed-out of additives over time. difficult to provide.

If the homopolypropylene resin exceeds 95, that is, if the propene-ethylene copolymer resin is less than 5, the impact strength is low and cracks and cracks occur when dropped (particularly at temperatures below freezing, they crack easily and are difficult to put into practical use), resulting in large haze. Difficult to put into practical use.

In addition, as a propylene/ethylene copolymer resin, we do not use resins like propylene/ethylene block copolymer resins, which easily cause molded products to whiten due to pressure or impact, have low surface strength, and are prone to scratches and white powder. When used, propylene/ethylene block copolymer resin is
By using 70% by weight, preferably 10 to 50% by weight, particularly preferably 15 to 40% by weight, the above drawbacks can be compensated for and a container body for photographic film cartridges with improved impact strength can be obtained.

Homopolypropylene resin is easy to polymerize and is inexpensive, has high rigidity and surface strength, and has excellent injection moldability, but it lacks impact strength and transparency, and the container for photographic film cartridge of the present invention requires moisture proofing and gas barrier properties. As a main body, it cannot be put to practical use as a single resin.

Propylene/ethylene copolymer resin can be produced using a polymerization method using a composite catalyst (Ziegler catalyst) obtained by mixing titanium tetrachloride (TICl4) and triethylaluminum (A f El) in a saturated hydrocarbon solvent, or a polymerization method using a composite catalyst (Ziegler catalyst) obtained by mixing titanium tetrachloride (TICl4) and triethylaluminum (A f El) in a saturated hydrocarbon solvent. Titanium (TiCffiz) and triethylaluminum (^1a
tS) is produced by a polymerization method using a composite catalyst (Natsuta Catalyst), and other polymerization methods include the standard oil method, Phillips method, and sun oil method, and in the present invention, products produced by any of these methods are used. be able to.

A specific example of a product name is Nippon Polypro (Japan Petrochemical).
, UBE Po IJ Pro (Ube Industries), Show Aroma
(Showa Denko), Susumu Noprene (Susumu Chemical), Chisso Polypro (Chisso), Mitsubishi Noblen (Mitsubishi Yuka), Tokuyama Polypro (Tokuyama Soda), Mitsui Petrochemical Polypro (Mitsui Petrochemical), Mitsui Noblen (Mitsui Toatsu Chemical) ) etc.

The propylene/ethylene copolymer resin preferred for the present invention has an ethylene content of 1 to 30% by weight, preferably 2 to 1% by weight.
5% by weight propylene/ethylene copolymer resin,
Particularly preferred is a propylene/ethylene random copolymer resin consisting of 85 to 95% by weight of propylene and 2 to 15% by weight of ethylene.

By adding a propylene/ethylene copolymer resin with an ethylene content of 1 to 30% by weight, the flexural modulus is increased. It is inexpensive, has fewer molding failures and white powder generation, can shorten the molding cycle, and has all the characteristics necessary for a photographic film cartridge container body within practical limits.As a result, it can be used anywhere in the world. It has also been discovered that a container body for a photographic film cartridge can be provided at low cost by using polypropylene resins other than the two types.

In the present invention, the polypropylene resin composition is 80%
More than heavy weight is made of homopolypropylene resin and propylene.
Preferably, it is made of ethylene copolymer resin.

In addition, the polypropylene resin composition contains o, oos or more of a lubricant by weight in order to make it easier to put in and take out the photographic film cartridge, reduce the charge on the container body, prevent blocking, and improve moldability. do.

If the content of the lubricant is less than 0.005% by weight, the content is too small and the effect of adding the lubricant is not produced.

It is preferable that the additive content of this lubricant does not exceed 5.0% by weight. If the content exceeds 5.0% by weight, slipping between the screw and the polypropylene resin will occur even if the content is fatty acids or fatty acid metal salts that have little effect on improving the lubricant. , the kneadability of the resin deteriorates.

Particularly in the case of fatty acid amide-based lubricants that are prone to bleed-out and have a large lubricity effect, it is necessary to prevent slippage between the screw and polypropylene-based resin, and to prevent dust from adhering to the lubricant and white powder from bleed-out.
1.0% by weight is preferred, especially 0.05-0.5% by weight
A range of is preferred.

The names of typical commercially available lubricants and manufacturers' salts of particularly preferred fatty acid amide lubricants and silicone lubricants are listed below.

(1) Silicone-based lubricants; various grades of dimethylpolysiloxane and their modified products (Shin-Etsu Silicone, Toshi Silicone), etc. (2) Oleic acid amide-based lubricants Nearmoss Philips CP (Lion Azzo), Neutron (Nippon Ruska) ), Neutron E-18 (Nippon Sakka), Amide 0 (Nitto Chemical), Alflo E~10 (Nippon Oil & Fats), Diamond 0-200 (Nippon Kasei), Diamond G-200 (Nippon Kasei), etc. (3) Erucic acid amide-based lubricants; Alflow P-10 (NOF), etc. (4) Stearic acid amide-based lubricants; Alflow S-10 (NOF), Neutron 2 (Nippon Rukka), Diamond 200 (Nippon Kasei), etc. 5) Bis fatty acid amide lubricant; Bisamide (Nippon Kasei), Diamond 200 Bis (
Nippon Kasei), Armowax EBS (Lion Azzo)
(6) Alkylamine lubricants; Electro Stripper TS-2, Electro Stripper TS-3 (Kao Soap), etc. (7) Hydrocarbon lubricants; Liquid paraffin, natural paraffin, microwax,
Synthetic paraffin, polyethylene wax, polypropylene wax, chlorinated hydrocarbon, fluorocarbon, etc. (8) Fatty acid-based lubricant: Higher fatty acid (preferably CI □ or higher), oxyfatty acid, etc. (9) Ester-based lubricant: Lower alcohol ester of fatty acid, Polyhydric alcohol esters of fatty acids, polyglycol esters of fatty acids, fatty alcohol esters of fatty acids, etc. (lO) Alcohol-based lubricants; polyhydric alcohols, polyglycols, polyglycerols, etc. (11) Metal soaps; lauric acid, stearic acid, ricinoleic acid , naphthenic acid, oleic acid and other higher fatty acids and Li, Mg, Ca, Sr.
, compounds with metals such as Ba, Zn, Cd, AN, Sn, and Pb.

The polypropylene resin composition constituting the photographic film cartridge container body of the present invention has a melt flow index (JIS K-7210=^STM D-1238,
Hereinafter referred to as MFI) is lθ ~ 60 g/10 min.

If the MFI is less than 1Og/10 minutes, the fluidity of the resin will be poor, the injection pressure will be high, and short shots will occur frequently.

When the MFI exceeds 60 g/10 minutes, the rigidity decreases, the fitting strength decreases, the moisture resistance deteriorates, and the cap becomes more likely to come off. Furthermore, deformation of the mouth and buckling are likely to occur, and molding failures such as cracks are also likely to occur, making it difficult to put into practical use.

Flexural modulus of polypropylene resin composition (JISK-7
203 = ASTM D-790) is 9000g7cm
“That’s it.

If the flexural modulus is less than 9000 g/c 8, the fitting strength will decrease, the moisture resistance will deteriorate, and the cap will often come off. Furthermore, lip deformation and buckling are likely to occur, and the molding cycle becomes long, making it difficult to put it into practical use.

In addition, notched Izot impact strength at 23°C (J
IS K-7110 = ASTM D-256) is 2.5
kg-cm/cva or more, and Rockwell hardness (J
IS K-7202 = ASTM D-785) is 85R
That's all.

Izotsu impact strength with notch is 2.0kg-cvaIc
If the temperature is less than -, cracks and cracks will occur due to drops at temperatures below freezing or impacts during the logistics process, making it impossible to ensure moisture resistance and sealing properties, making it difficult to put it into practical use.

If the Rockwell hardness is less than 85R, even if the molding conditions are taken into account, the quality deteriorates significantly due to generation of white powder and scratches due to additive bleed-out over time, making it difficult to put it into practical use.

In the present invention, various nucleating agents, antioxidants, surfactants, coloring substances, coupling agents, and other additives may be used as necessary.

There are two types of nucleating agents: organic nucleating agents and inorganic nucleating agents.
The purpose of adding an inorganic nucleating agent is to improve the crystallization rate, shorten and deform the molding cycle, prevent white powder generation, and improve physical properties. In other words, by increasing the rigidity of the resin composition and raising the crystallization temperature, bottom sink and buckling are less likely to occur even if the cooling time is shortened, and it is less likely to deform even when placed in large quantities in a hopper or container immediately after molding. This is to do so.

In addition, it is possible to improve Rockwell hardness and greatly improve wear resistance, and it is particularly effective in preventing white powder generation in high-speed processing and packaging processes and air conveyance processes.

Preferred representative examples of the organic nucleating agent are described below.

';-(P-methylbenzylidene) sorbitol, di(2,4-diethylbenzylidene) sorbitol, di(2,4-diethylbenzylidene) sorbitol, di(1,3,5-trimethylbenzylidene) sorbitol, di(pentamethyl benzylidene) sorbitol, l.
3,2,4-di(methylbenzylidene)sorbitol,
I, 3-P-ethylbenzylidene-2,4-P-methylbenzylidene-sorbitol, 1,3-P-methylbenzylidene-2,4-P ethylbenzylidene-sorbitol, 1,3-P-methylbenzylidene-2,4 -P-chlorobenzylidene sorbitol, 1,3-P-chlorobenzylidene-2,4-P-methylbenzylidene sorbitol, 1,3-P-methylbenzylidene-2,4-P-isopropylbenzylidene sorbitol, 1-IP isopropylbenzylidene -2.4-P-methylbenzylidene sorbitol, l.3-P-ethylbenzylidene-2.
4-P-isopropylbenzylidene sorbitol, 1.
3-P-Chlorobenzylidene 2.4-P-isopropylbenzylidene sorbitol, l.3.2.4-di(ethylbenzylidene) sorbitol, 1.3.2.4-di(
propylbenzylidene) sorbitol, 1, 3, 2, 4
-di(methoxybenzylidene)sorbitol, 1.3.
2,4-di(ethoxybenzylidene)sorbitol, 1
・3,2,4-:,; (P-methylbenzylidene) sorbitol, 1,3,2,4-di(P-chlorobenzylidene) sorbitol, 1,3,2,4-di(P-methoxybenzylidene) sorbitol , 3.2.4-di(alkylbenzylidene) sorbitol and the like, dibenzylidene sorbitol compounds are particularly preferred.

Inorganic nucleating agents include alkali metal hydroxides such as lithium hydroxide, sodium hydroxide, and potassium hydroxide, alkali metal oxides such as sodium oxide, lithium carbonate, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, and potassium hydrogen carbonate. alkaline earth metal hydroxides such as calcium hydroxide, magnesium hydroxide, barium hydroxide, and alkaline earth metal oxides such as calcium carbonate and calcium oxide.

The organic nucleating agent may be used alone, in combination with an inorganic nucleating agent, or in combination of two or more organic nucleating agents. Further, it is preferable to coat the surface of the organic nucleating agent with various fatty acids, fatty acid compounds, coupling agents, surfactants, and the like.

The amount of the organic nucleating agent added is preferably 0.01 to 1.0% by weight. If the amount added is less than 0.01% by weight, the addition effect will hardly be exhibited and the blending cost will increase, and if it exceeds 1.0% by weight, there will be no increase in the amount and the cost will increase, and the nucleating agent. Depending on the type, it may have an adverse effect on the photographic film, may adhere to the mold, may bleed out, or may significantly reduce the drop strength, which is undesirable.

Methods for blending the organic nucleating agent include a compound method, a tri-blend method, a masterbatch method, etc., and the masterbatch method is preferable. Since it has a high bulk and easily scatters, it is difficult to mix it as is, so it is better to mix it with a small amount of dispersant and wetting agent. Examples of effective dispersants include carboxylic anhydride and higher fatty acids, and lubricants such as oleic acid amide are particularly preferred.

Plasticizers such as DOP and DHP can be used as wetting agents.

In order to prevent the bad odor of the organic nucleating agent, it is preferable to mix and use a coupling agent. Representative examples of typical coupling agents are described below.

In addition to silane coupling agents such as vinyl silane coupling agents, acrylic silane coupling agents, epoxy silane coupling agents, aminosilane coupling agents, and mercaptosilane coupling agents, titanate, chromium, and aluminum Various coupling agents such as those based on the above-mentioned coupling agents can be used.

It is preferable that such a coupling agent is added in an amount of 0.01 to 5.0% by weight.

In order to efficiently and continuously mold the container body for a photographic film cartridge, it is preferable to add an antioxidant.

Examples of antioxidants are described below.

(a) Phenolic antioxidant 6-1-butyl-3-methylphenyl derivative, 2.6
-di-butyl-P-cresol (1-1-butylphenol), 2,2°-methylenebis-(4-ethyl-6-
t-butylphenol), 4,4゛-butylidene bis(
6-t-butyl-m-cresol), 4,4゛-thiobis(6-t-butyl-m-cresol), 4,4-dihydroxydiphenylcyclohexane, alkylated bisphenol, styrenated phenol, 2,6-thiobis Monobutyl-4-methylphenol, n-octadecyl-3-(
3', 5'-di-t-butyl-4'-hydroxyphenyl)propinate, 2,2'-methylenebin (4-methyl-6-t-butylphenol), 4,4'-thiobis(3-methyl-6 -1-butylphenyl), 4.4°
-butylidene bis(3-methyl-6-t-butylphenol), stearyl-β (3,5-di-4-butyl-
4-hydroxyphenyl) propionate, ■・1・3
-tris(2-methyl-4hydroxy-5-1-butylphenyl)butane, 1,3,5 trimethyl-2,4,6
-tris(3.5-';-t-butyl-4hydroxybenzyl)benzene, tetrakis(methylene-3(3°.
5゛-di-t-7'+ru4''-hydroxyphenyl)
Propionate comethane, etc. (II) Ketone amine condensation antioxidant 6-nitoxy 2,2,4-trimethyl-1,2-dihydroquinoline,
Polymers of 2,2,4-trimethyl-1,2-dihydroquinoline, trimethyldihydroquinoline derivatives, etc. (c) Allylamine antioxidants Phenyl-α-naphthylamine, N-phenyl-β-naphthylamine, N-phenyl-N -Isopyrobyl-P-phenylenediamine, N-N'-diphenyl-P-
Phenyl diamine, N-N″-di-β-naphthyl-P
-Phenylenediamine, N-(3'-hydroxybutylidene)-1-naphthylamine, etc. (ii) Imidazole antioxidants 2-mercaptobenzimidazole, zinc salt of 2-mercaptobenzimidazole, 2-mercaptomethylbenzimidazole, etc. N) Phosphite-based antioxidants Alkylated allyl phosphite, diphenylisodecyl phosphite, tris(nonylphenyl) phosphite, sodium phosphite, trinonylphenyl phosphite, triphenyl phosphite, etc. (h) Thiourea-based antioxidants Antioxidants Thiourea derivatives, l,3-bis(dimethylaminopropyl)-2-thiourea, etc. (g) Other antioxidants useful for air oxidation, such as dilauryl thiodipropionate, etc. (ch) Sulfur-based antioxidants dilauryl thiodipropionate, etc. Lauryl thiodipropionate, simiristylthiodipropionate, laurylstearylthiodipropionate, distearylthiodipropionate, etc. Next, the trade names of typical commercially available antioxidants are described below.

(1) Phenolic antioxidant: SUMIL [ZIERBHT (resident), IRGANOX
1076 (Ciba Geigy), MARK AO-50 (
ADEKA ARGUS), SUMILIZERflP-76
(Resident), TOMINOX 55 (Yoshitomi), IRGAN
OX565 (Ciba Geigy), N0NOX WSP (I
CI), SANTONOX (Monsanto), SU
MILIZERWX R (resident), ^NTAGtICR
Y-STAL (Kawaguchi), IRGANOX 1035 (Ciba Geigy), ANT-AGE W-400 (Kawaguchi),
N0CLIZERN5-6 (Iriuchi Shinko), IRGANO
X 1425 WL (Ciba Geigy), MARK AO
-80 (Azocar 7-Gas), SIIMILIZERG
A-80 (Resident), TOP-ANOL CA (ICI)
, MARK AO-30 (ADEKA ARGUS), MAR
KAO-20 (7 Deca Argus), IRGANOX
3114 (-F-Bagaigy), MARK AO-33
0 (ADEKA ARGUS), IRGANOX 1330 (
Ciba Geigy), CYANOK 1790CACC),
IRGANOX 1010 (Ciba Geigy), MARK
AO-60 (7 deca argus), StlMILIZ
ERBP-101 (resident), TOMI-NOX TT (
(2) Phosphorous antioxidant; IRGAFO516B (Ciba Geigy), MARK 2
112 (ADEKA ARGUS), WESTON 618 (
BorgWarner), MARK PEP-8 (77' Car 7-Gas), 1JLTI? ANOX 626 (Boulder Warner), MARK PEP-24G (7 deca.
Arcus), MARK PEP-36 (7TECA・7-Gas), HCA (Sanko), etc. (3) Thioether antioxidant;
Mft, IZERTPL (resident), ANTIOX L (
Nissin), DMTD ``YOSHITOM1'' (Yoshitomi), S
UMILIZERTPM (resident), ANTIOX M (
Nisshin), mouth STP “YOS1117OM1” (Yoshitomi), S [JMILIZERTPS (resident), ANTIO
X S (Sunyu), 5EENOX 412S (Schiff'0
), MARK AO4125 (7 Deca Argus), S
UMILIZERTP-D (resident), MARK AQ-
23 (ADEKA ARGUS), 5ANDSTAB P-F
, PQ (Sand), IRGAFO5P-EPQ FF (
Ciba Geigy), IR-GANOK 1222 (Ciba Geigy), MARK 329K (Adeka Arcus),
Wll! S TON399 (Ho/Reg・'7-1--)
, MARK260 (Adeka Argus), MARK 5
22A (Adeka Argus) etc. (4) Metal deactivator NAUCARD XL-1 (j-20 Iar), NAR
K CDA-1 (7 Deka Argus), MARK CD
A-6 (ADEKA ARGUS), t, RGANOX MD
-1024 (Ciba Geigy, CUNOX (Mitsui Toatsu), etc.) It is preferable that such antioxidants be added in an amount of 0.01 to 1.0% by weight.If it is less than 0.01% by weight, the addition effect will hardly be exhibited and the blend will not be effective. It will only increase the cost,
If it exceeds 1.0% by weight, there will be no effect of increasing the amount and the cost will increase, and depending on the type of antioxidant, it may have an adverse effect on the photographic film, so it is not preferable.

A surfactant can be added for antistatic purposes.

Representative examples of surfactants are described below.

■Nonionic surfactants polyethylene glycol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene fatty alcohol ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene glycerin fatty acid ester, polyoxyethylene fatty amine, sorbitan monofatty acid esters, fatty acid pentaerythritides, ethylene oxide adducts of fatty alcohols, ethylene oxide adducts of fatty acid aminos or fatty acid amides,
Ethylene oxide adducts of alkylphenols, ethylene oxide adducts of alkylnaphthols, ethylene oxide adducts of partial fatty acid esters of polyhydric alcohols, and various other nonionic antistatic agents described in Japanese Patent Publication No. 63-26697.

■Anionic surfactant Wasylic acid sulfate ester soda salt, various fatty acid metal salts, Wasylic acid ester sulfate ester soda salt, sulfated oleate ethylaniline, olefin sulfate ester salts, oleyl alcohol sulfate ester soda salt, alkyl sulfate ester ester salt , fatty acid ethyl sulfonate, alkyl sulfonate, alkylnaphthalene sulfonate, alkylbenzene sulfonate, succinate sulfonate, phosphate ester salt, etc.■ Cationic surfactant primary amine salt, tertiary Representative examples of amphoteric surfactants such as amine salts, quaternary ammonium salts, and pyridine derivatives are listed below.

Nonionic surfactants include carboxylic acid derivatives, imidacillin derivatives, betaine derivatives, etc., but they do not have a negative effect on photographic film and are effective in preventing the generation of static electricity.
The cationic surfactant (2) is preferred.

It is preferable that such a surfactant is added in an amount of 0.01 to 5.0% by weight.

If it is less than 0.01 wt%, the addition effect will hardly be exhibited and the blending cost will be increased, and if it exceeds 5.0 wt%, there will be no increase in the amount and the cost will only increase. Depending on the type of agent, it may have an adverse effect on photographic film, or it may bleed out and cause dust to adhere to it. Transparency also decreases.

When coloring the container body for a photographic film cartridge, a coloring substance can be added.

Examples of colored substances are shown 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 Fiber B, hydroxide...aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate C0 carbonate...calcium carbonate, magnesium carbonate,
Dolomite, Dawsonite D, (nitrous) sulfate...calcium sulfate, barium sulfate, ammonium sulfate, calcium sulfite [, silicate...talc, clay, mica, asbestos, glass fiber, glass balloon, glass peas, silicic acid Calcium, montmorillonite, bentonite F, carbon...carbon black, graphite, carbon fiber, carbon hollow sphere G, others...iron powder, copper powder, lead powder, tin powder, stainless steel powder, pearl pigment, aluminum powder, sulfide Molybdenum, boron fiber, silicon carbide fiber, brass fiber, potassium titanate, lead zirconate titanate, zinc borate, barium metaborate, calcium borate, sodium borate, aluminum paste, talc (2) Organic compound wood powder ( pine, oak, sawdust, etc.), shell fibers (almond, peanut, rice husk, etc.), various colored fibers such as cotton, jute, paper strips, cellophane strips, nylon fibers, polypropylene fibers, starch, aromatic polyamide fibers. Among the coloring substances, opaque inorganic compounds are preferred, and in particular light-absorbing carbon black, titanium nitride, graphite, and light-reflecting substances, which are relatively inert substances with excellent heat resistance and light resistance. Preferably, aluminum powder or aluminum paste is used.

In the resin composition of the present invention, various additives other than those mentioned above can be added in required amounts as necessary.

Typical examples of additives are listed below, but the present invention is not limited thereto, and additives can be selected from all known additives that do not adversely affect the photographic film.

(Additive types) (Representative examples) (1) Plasticizers: Phthalate esters, glycol esters, fatty acid esters, phosphate esters, etc. (2) Stabilizers: Lead-based, cadmium-based, zinc-based, alkaline earth metal-based , perforated tin type, etc. (3) Flame retardants; Phosphate esters, halogenated phosphate esters, halogenated L inorganics, phosphorus-containing polyols, etc. (4) Fillers; Alumina, kaolin, clay calcium carbonate, mica, talc, titanium oxide, Silica, etc. (5) Reinforcing agent; Glass roving, metal fiber, glass fiber, glass milled core iber, etc. (6) Coloring agent; Inorganic pigment (Al, FezO3
, T10z.

ZnO, CdS, etc.), organic pigments, dyes, etc. (7) Vulcanizing agents; vulcanization accelerators, accelerators, etc. (8) Deterioration inhibitors; UV absorbers, metal deactivators, peroxide decomposers, etc. (9) Various thermoplastic resins, elastomers, rubbers, etc., particularly polyolefin thermoplastic resins are preferred.

In order to injection mold the container body, various methods can be used in addition to the conventional method using a single stack mold. For example, use a method that combines two methods such as the injection blow molding method, or an efficient injection molding method that uses a multi-stage mold such as a full-mold vacuum injection molding method or a stack mold (double stacked mold). Can be done.

In addition to the shape shown in FIG. 1, the shape of the container body of the present invention is not limited to that shown in FIG.
-164077, as long as it can accommodate the container body and film cartridge, but it is not particularly limited as long as it can secure a sufficient fit and seal with the container cap,
In addition, it is preferable that the container cap be easily attached and detached.

The material for the container cap is preferably one that is more flexible than the container body, such as low-density polyethylene resin or L-LDPE resin, in order to improve the fit and seal with the container body and to fully demonstrate the above-mentioned functions. Alternatively, mixed resins of these two resins, mixed resins of these resins and other thermoplastic resins, and fatty acid amide lubricants of 0.01 to 0.6 in order to improve the injection moldability and antistatic properties of these resins. A polyethylene resin containing % by weight is preferred.

The polypropylene resin composition used in the photographic film cartridge container body of the present invention is suitable for molded products that do not like bleed-out of lubricants and other additives, require impact strength, and do not like deformation, for example, -100617 Publication, Utility Model Application Publication No. 1983-137344, Utility Model Application Publication No. 1987-
No. 77144, Japanese Utility Model Application No. 62-99571, Japanese Patent Application Publication No. 63-223640, EPo 242905
A hinged plastic case disclosed in Utility Model Publication No. 44-28473, a valve lid fitting container disclosed in Japanese Utility Model Publication No. 46-7501, etc., Utility Model Publication No. 61-3000, Utility Model Publication No. 61-36995, etc. Publication No. 61-3
It is also suitable for spools disclosed in Japanese Utility Model Application No. 6996, Japanese Utility Model Application Publication No. 63-73742, etc., and cores disclosed in Japanese Utility Model Application Publication No. 61-86367, Japanese Utility Model Application Publication No. 61-128256, etc. Furthermore, for items that require light-shielding properties, a light-shielding substance can be added and used as light-shielding containers or light-shielding molded products.

[Effect]

The photographic film cartridge container body of the present invention has high rigidity, excellent injection moldability, and does not suffer from deformations such as bottom sink, mouth deformation, and buckling. Furthermore, there are almost no molding failures, and the molding cycle is greatly shortened.

The surface has high abrasion resistance, good lubricity, and has a large IJ-door suppression effect. In addition, although it has high rigidity and is difficult to deform or buckle, it has high impact strength.

〔Example〕

As a molding machine, we used Neskuru (product name) made by Juuki,
The mold squeezing force is 150t, the number of cavities is 24, the runner type is a hot runner in the shape shown in Figure 1, and the thickness of the peripheral wall 15 is 0.
．． A container body for a photographic film cartridge of 81IIm was injection molded.

Invented product! MFI is 40g/10min, density (ASTM D~150
5) is 0.91g/cts3, flexural modulus is 21000
g/cwt”, notched iso impact strength at 23°C is 2.5 kg-cm/cs+, Rockwell hardness (measured with a thickness of 3.2 pupils) is 35% by weight of homopolypropylene resin, and MFI is 25 g. /10 minutes, density is 0.9
0g/c+1. Flexural modulus is 9200Kg/cmz,
Notched Izot impact strength at 23℃ is 5.0kg-c
ta/cta.

Propylene-ethylene random copolymer resin with Rockwell hardness (measured at 3.2 m thickness) of 8OR, ethylene content of 3.3% by weight, 64.35% by weight, oleic acid amide 0.3% by weight, phenolic oxidation Tetrakis[methylene-3-(3',5'-di-tert-phthyl-4°-hydroxyphenyl)propionate cometaf 0.2% by weight as an inhibitor, 1.3.2.4- as an organic nucleating agent.
Di(methylbenzylidene) sorbitol 0.15% by weight
, MFI is 31g/10min, density is 0.90g
/cd, bending rigidity 12.000kg/cm”, 23°
Notched Izo impact strength of C is 3.8kg・CII
A polypropylene resin composition with I/cm and Rockwell hardness of 92R was used.

Inventive product■ The same homopolypropylene resin as Inventive product I was used at 64.3%
5% by weight, MFI 25g/10min, density 0.91g
/d, flexural modulus is 12.500Kg/cm", 23"
Izotsu impact strength with C/7chi is 13kg-c++/
cm, Rockwell hardness (measured at a thickness of 3.2 m) is 8O
The composition was the same as that of the invention product I, except that the propylene-ethylene block copolymer resin with an ethylene content of 6% by weight in R was changed to 35% by weight, and the MFI was 30g/10min.
Density is 0.90g/aj, bending rigidity is 13.3QOkg
/cmz, a notched isot impact strength at 23°C of 8.2 kg-cm/cm, and a Rockwell hardness of 89R.

Comparison hole 1 The same homopolypropylene resin as inventive product 1 was used at 99.3
It has the same composition as the invention product (■) except that the content is 5m1f%, and the MFI is 42g/10min and the density is 0.90g/ad.
, flexural modulus is 21.600 kg/cm", notched isot impact strength at 23°C is 2.6 kg-cm/cr
a. A polypropylene resin composition with a Rockwell hardness of 112R was used.

Comparison hole ■ The same composition as the invention product I, except that the same propylene-ethylene random copolymer resin as the invention product ■ was used at 99.35% by weight, and the MFI was 28 g/10 min and the density was 0. .90g/cj, flexural modulus is 9800kg/cmz
, Notched Izotsu impact strength at 23°C is 5.5kg
-cm/cab, a polypropylene resin composition having a Rockwell hardness of 83H was used.

Comparison hole ■ The same composition as the invention product I, except that the same propylene-ethylene block copolymer resin as the invention product ■ was used at 99.35% by weight, the MFI was 26 g/10 min, and the density was 0. .90g/cd, flexural modulus is 12.900kg/c
m”, notched isot impact strength at 23°C is 13.
5kg-c11+/Cat, Rockwell hardness is 82R
A polypropylene resin composition was used.

Table 1 shows the results of comparing these properties.

The evaluation is based on the following.

◎...Excellent ○...Excellent...Possible (within practical limits) ×...Not practical *A photographic film roll 0 copies 36 sheets in a photographic film cartridge container with white powder adhesion The manipulation film was sealed, fixed with tape to a vibration tester specified in JIS Z-0232, and tested at a vibration width of 5IllI x vibration frequency of 550 times/
The amount of white powder adhering to the tip of the photographic film when vibrated under the conditions of 60 minutes x 60 minutes is evaluated by visual inspection.

*B-drop strength 36-sheet patrone photographic film (Fujicolor 1)
(R-10036EX) was placed in a container body, sealed with a container cap, and then dropped from a height of 5 meters onto a concrete floor. Evaluation was based on the occurrence rate of cracks or cracks. (room temperature 20
(Tested at °C) *C Whitening when a 36-sheet manipulated film container body is dropped from 5 meters onto a concrete floor Above *B: The same test method as for drop strength was used to visually check the caking state of a dropped container body due to the impact of the fall. evaluation.

*D Injection moldability (low incidence of mouth deformation and buckling) Using the molding machine and mold of the example, a container body with the shape shown in Figure 1 was cooled for 3 seconds using each polypropylene resin. , evaluated based on the low incidence of molding failures such as mouth deformation, buckling, and poor mold release when molded under the molding conditions of 9 seconds molding cycle.

*E Place the container body between your eyes and the transparency test paper on which parallel lines with a transparency line thickness of 0.5 mm and an interval of 2III11 are drawn on a blank sheet of paper, move it away from your eyes, and then place the container body on the transparency test paper on the back of the container body. Evaluation is based on the distance at which parallel lines become invisible.

The larger the distance, the better the transparency.

〔Effect of the invention〕

Since the present invention is constructed as described above, it has good transparency, moisture resistance, and excellent injection moldability. It also has high rigidity and high impact strength. It has lubricity and excellent abrasion resistance on the surface, with little scratching and bleed-out from lubricants and additives, and almost no dust or white powder adhesion to the tongue of the photographic film.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the photographic film cartridge container body of the present invention.

Claims (1)

[Claims] 0.005% by weight or more of lubricant, 5:95 to 9 of homopolypropylene resin and propylene/ethylene copolymer resin
Contains at a ratio of 5:5 and has a melt index of 10 to 60.
g/10 minutes, flexural modulus of 9000 Kg/cm^2 or more, notched Izod impact strength at 23°C of 2.5
A container body for a photographic film cartridge characterized by being made of a polypropylene resin composition having a hardness of 85R or more and a Rockwell hardness of 85R or more.