JP2731936B2 - Resin composition for photographic light-sensitive material and packaging material for photographic light-sensitive material using the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a resin composition used for various products of a photographic material and a packaging material for the photographic material using the same.

[Conventional technology]

Conventionally, resin compositions used for packaging materials for photographic light-sensitive materials (hereinafter, referred to only as resin compositions) are disclosed in JP-A-1-2430.
No. 50, JP-A-63-217548, etc., a film for packaging photographic photosensitive materials is disclosed in JP-A-58-132555, etc., and a photographic film spool is disclosed in JP-A-63-53545, etc. It had been.

In these, light-shielding properties have been ensured by adding a light-shielding substance such as carbon black.

[Problems to be solved by the invention]

However, in the case of a conventional film for packaging a photographic light-sensitive material, it was necessary to increase the amount of a light-shielding substance to increase the light-shielding property. But,
When the addition amount of the light-shielding substance increases, the occurrence of bumps and fish eyes increases, and the physical strength, moldability, heat sealability, etc. decrease, which is not preferable.

Also, since the dimensions and shape of photographic film spools are specified by JIS, a large amount of light-shielding substance must be added so that light-shielding properties can be ensured even in the thin-walled parts. Unnecessary light-shielding substances were added.

An object of the present invention is to solve the above problems and to provide a resin composition capable of enhancing light-shielding properties without increasing the amount of a light-shielding substance added, and a packaging material for a photographic light-sensitive material using the same.

[Means for solving the problem]

In order to achieve the above object, the present inventors have studied diligently the effects of various substances on light-shielding properties, and when vitamin E is added together with a light-shielding substance, particularly carbon black, compared to the case where vitamin E is not added. It was found that the light-shielding property was improved by 20% or more.

Addition of a lubricant to this resin composition was effective for improving film formability and the like.

The present invention has been completed for the first time by the above-described research by the present inventors, that is, the resin composition for a photographic light-sensitive material of the present invention has a pH of at least 6.0 to 9.0 and an average particle diameter of 10
It is characterized by comprising a thermoplastic resin containing が 120 mμ of carbon black, 0.02 to 0.5% by weight of vitamin E and 0.005 to 5.0% by weight of a lubricant.

Further, the packaging material for a photosensitive material using the resin composition of the present invention has a pH of at least 6.0 to 9.0 and an average particle diameter of 10 to 120 m.
μ of carbon black and 0.02-0.5% by weight of vitamin E
And a resin composition comprising a thermoplastic resin blended with 0.005 to 5.0% by weight of a lubricant.

The thermoplastic resin used in the resin composition of the present invention, various thermoplastic resins can be used depending on the desired molded product, polyethylene resin, polypropylene resin,
Preferred are ethylene copolymer resins, modified polyolefin resins, polystyrene resins, ABS resins, vinyl chloride resins, polyester resins, polyamide resins, polyacetal resins, and the like.

Gas black, furnace black, channel black,
Anthracene black, acetylene black, Ketjen carbon black, thermal black, lamp black, oil smoke, pine smoke, animal black, vegetable black, and the like. In the present invention, furnace carbon black is desirable for the purpose of improving light-shielding properties, cost, and physical properties, and acetylene carbon black and Ketjen carbon black, which is a modified accessory carbon black, are preferable as light-shielding substances that are expensive but have an antistatic effect. . If necessary, it is also desirable to mix the former and the latter according to required characteristics.

There are various forms in which carbon black is blended with the polyethylene polymer, but the masterbatch method is desirable in terms of cost, prevention of workplace contamination, and the like. Japanese Patent Publication No. 40-
Japanese Patent Publication No. 26196 discloses a method of preparing a polymer-carbon black masterbatch by dispersing carbon black in a solution of a polymer dissolved in an organic solvent.
Japanese Patent Publication No. 362 describes a method for preparing a masterbatch by dispersing carbon black in polyethylene.

When used for packaging materials for photographic light-sensitive materials, there is little fogging, little change in light sensitivity, large light-shielding ability, hardening (bubbles) and pinholes in the film such as fish eyes. In particular, furnace carbon black having a pH of 6.0 to 9.0, an average particle diameter of 10 to 120 mμ, a volatile component of 2.0% or less, and an oil absorption of 50 ml / 100 g or more is preferable among carbon blacks.

The carbon black may be in the form of a powdery colorant, a pastey colorant, a wettable colorant, a masterbatch, a dye / pigment, a colored pellet, or the like, depending on the resin used, the machine used, the cost, and the like.

The vitamin E is also known as tocopherol (Tocofero)
l) A fat-soluble vitamin called tocol, a derivative of
Four types of α, β, γ, and δ tocopherols have been isolated. In addition, in the present invention, 5,7-dimethyltocol, 7-methyltocol, 5-methyltocol and the like having vitamin E activity are also included in vitamin E. Manufacturers (domestic) include Japan Roche, Eisai, and Nisshin Flour Milling.

The amount of vitamin E added ranges from about 0.02 to about 0.5% by weight.

If it is less than 0.005% by weight, there is almost no effect of addition, and only the kneading cost is increased. If the amount exceeds 1.0% by weight, the effect of increasing the amount is almost negligible and only the cost is increased. Further, the quality performance of the photographic material is adversely affected, which is not preferable.

A lubricant is added to the resin composition of the present invention in order to improve film formability and the like.

The names of typical commercially available lubricants and manufacturers that can be used in the present invention are described below.

(1) Silicone lubricant; various grades of dimethylpolysiloxane and its modified products (Shin-Etsu Silicone, Toray Silicone), etc. (2) Oleic amide lubricant; Armoslip CP (Lion Akzo), Neutron (Nippon Seika) , Neutron E-18 (Nippon Seika), Amide O (Nitto Chemical), Alflo E-10 (Nippon Yushi),
Diamid O-200 (Nippon Kasei), Diamid G-2
00 (Nihon Kasei), etc. (3) Erucamide amide lubricant; Alflo-P-10 (Nippon Oil & Fats), etc. (4) Stearamide amide lubricant; Alflo-S-10 (Nippon Oil & Fats), Neutron 2 (Nihon Seiki) ), Diamid 200 bis (Nippon Kasei), etc. (5) Bis fatty acid amide-based lubricants; Bisamide (Nippon Kasei), Diamid 200 bis (Nippon Kasei), Armowax EBS (Lion Akzo), etc. (6) Alkylamine Electro-stripper TS-2, Electro-stripper TS-3 (Kao Soap), etc. (7) Hydrocarbon-based lubricant; Liquid paraffin, natural paraffin, microwax, synthetic paraffin, polyethylene wax, polypropylene wax, chlorinated carbonized hydrogen, fluoro carboxylic, etc. (8) fatty acid based lubricants; higher fatty acids (C ₁₂ or higher is preferable), 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, etc. (10) Alcohol lubricants; polyhydric alcohol, polyglycol, polyglycerol, etc. (11) Fatty acids Metal salt lubricants (metal soaps); higher fatty acids such as lauric acid, stearic acid, ricinoleic acid, naphthenic acid, oleic acid and Li, Mg, Ca, Sr, Ba,
Compounds with metals such as Zn, Cd, Al, Sn, and Pb, etc. This lubricant is preferably added in an amount of 0.005 to 5.0% by weight. Particularly, in the case of a fatty acid amide-based lubricant which has a lubricating effect and easily bleeds out, it is preferable to add 0.005 to 0.5% by weight.

Further, an antioxidant can be added to prevent burning of the resin.

Representative examples of the antioxidant that can be used in the present invention are described below.

(A) phenolic antioxidant 6-t-butyl-3-methylphenyl derivative, 2.
6-di-t-butyl-P-cresol, 2,2'-methylenebis- (4-ethyl-6-t-butylphenol),
4.4'-butylidenebis (6-tert-butyl-m-cresol), 4.4'-thiobis (6-tert-butyl-m-
Cresol), 4,4-dihydroxydiphenylcyclohexane, alkylated bisphenol, styrenated phenol, 2,6-di-t-butyl-4-methylphenol, n-octadecyl-3- (3 '/ 5'-di-t -Butyl-4'-hydroxyphenyl) propinate, 2.
2'-methylenebis (4-methyl-6-t-butylphenol), 4,4'-thiobis (3-methyl-6-t-
Butylphenyl), 4,4'-butylidenebis (3-
Methyl-6-t-butylphenol), stearyl-β
(3.5-di-4-butyl-4-hydroxyphenyl)
Propionate, 1,1,3-tris (2-methyl-4
(Hydroxy-5-t-butylphenyl) butane, 1.3
.5 Trimethyl-2,4,6-tris (3.5-di-t
-Butyl-4hydroxybenzyl) benzene, tetrakis [methylene-3 (3'.5'-di-tert-butyl-4 ')
-(Hydroxyphenyl) propionate] methane and the like (ii) Ketone amine condensation antioxidant 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, 2,2,4-trimethyl-1,2-dihydroquinoline (C) Allylamine antioxidant phenyl-α-naphthylamine, N-phenyl-β-
Naphthylamine, N-phenyl-N'-isopropylidyl-
P-phenylenediamine, NN'-diphenyl-P-
Phenylenediamine, NN'-di-β-naphthyl-P
-Phenylenediamine, N- (3'-hydroxybutylidene) -1-naphthylamine, etc. (d) Imidazole antioxidant 2-mercaptobenzimidazole, zinc salt of 2-mercaptobenzimidazole, 2-mercaptomethylbenzimidazole, etc. E) Phosphite antioxidants Alkylated allyl phosphite, diphenylisodecyl phosphite, tris (nonylphenyl) phosphite sodium phosphite, trinonyl phenyl phosphite, triphenyl phosphite, etc. Antioxidants Thiourea derivatives, 1,3-bis (dimethylaminopropyl) -2-thiourea, etc. (g) Other antioxidants useful for aerial oxidation Dilauryl thiodipropionate Typical commercial antioxidants are shown below. Show.

(1) Phenolic antioxidants; SUMILIZER BHT (Sumitomo), IRGANOX 1076 (Ciba Geigy), MARK AO-50 (ADEKA Argus), SUMILIZER B
P-76 (Sumitomo), TOMINOX SS (Yoshitomi), IRGANOX 565 (Ciba Geigy), NONOX WSP (ICI), SANTONOX (Monsant
o), SUMILIZER WX R (Sumitomo), ANTAGECRYSTAL (Kawaguchi), IRGANOX 1035 (Ciba Geigy), ANTAGE W-400
(Kawaguchi), NOCLIZER NS-6 (Shinko Ouchi), IRGANOX 142
5 WL (Ciba Geigy), MARK AO-80 (Adeka Argus), SUMILIZER GA-80 (Sumitomo), TOPANOL CA (IC
I), MARK AO-30 (ADEKA Argus), MARK AO-20
(Adeka Argus), IRGANOX 3114 (Ciba Geigy), MARK AO-330 (Adeka Argus), IRGANOX 13
30 (Ciba Geigy), CYANOX 1790 (ACC), IRGANOX 10
10 (Ciba-Geigy), MARK AO-60 (Adeka-Argus), SUMILIZER BP-101 (Sumitomo), TO-MINOX TT (Yoshitomi), etc. (2) Phosphorus antioxidants; IRGAFOS 168 (Ciba-Geigy), MARK 2112 (Adeka)・
Argus), WESTON 618 (Borg Warner), MARK PEP
-8 (Adeka Argus), ULTRANOX 626 (Borg Warner), MARK PEP-24G (Adeka Argus), MARK
PEP-36 (Adeka Argus), HCA (Sanko), etc. (3) Thioether antioxidants; DLTDP “YOSHITOMI (Yoshitomi), SUMILIZER TPL (Sumitomo), ANTIOX L (NOF), DMTD“ YOSHITOMI ”(Yoshitomi) , SUMILIZER TPM (Sumitomo), ANTIOX M (NOF), DST
P “YOSHITOMI” (Yoshitomi), SUMILIZER TPS (Sumitomo), ANT
IOX S (NOF), SEENOX 412S (Cipro), MARK AO-412
S (Adeka Argus), SUMILIZER TP-D (Sumitomo),
MARK AO-23 (Adeka Argus), SANDSTAB P-EPQ
(Sand), IRGAFOS P-EPQ FF (Ciba Geigy), IRG
ANOX 1222 (Ciba Geigy), MARK 329K (Adeka Argus), WES TON399 (Borg Warner), MARK 260
(Adeka Argus), MARK 522A (Adeka Argus), etc. (4) Metal deactivator NAUGARD XL-1 (Uniroyal), MARK CDA-1 (Adeka Argus), MARK CDA-6 (Adeka Argus) , LRGANOX MD-1024 (Ciba Geigy), CU-NOX
(Mitsui Toatsu), etc. Particularly preferred antioxidants are phenolic antioxidants, and commercially available products include Irganox of Ciba-Geigy and Sumilizer BHT, Sumilizer BH of Sumitomo Chemical Co., Ltd.
−76, Sumilizer WX-R, Sumilizer BP-101 and the like.

Also, 2.6-di-t-butyl-p-cresol (BH
T), low volatility high molecular weight phenolic antioxidants (trade names Ireganox 1010, Ireganox 1076, Topanol CA, Ionox 3
30), dilauryl thiodipropionate, distearyl thiopropionate, dialkyl phosphate and the like, and it is effective to use two or more thereof in combination.

This antioxidant is preferably added in an amount of 0.005 to 1.0% by weight.

If the amount is less than 0.005% by weight, the effect of the addition is hardly expected, and only the kneading cost is increased. If the amount exceeds 1.0% by weight, there is almost no effect of increasing the amount, not only the cost is increased, but also many of the photographic light-sensitive materials cause fogging, a feeling of increase and decrease, and the like.

In order to prevent blocking of the packaging material for photographic light-sensitive material of the present invention, an anti-blocking substance can be added to the resin composition.

Representative commercial names of the anti-blocking substances are shown below.

(1) Inorganic antiblocking substance (a) Silica; Syloid 244 (Fuji Davison), Syloid 978 (Da
vison), Celite High Flow Supercell (Johns-Ma
nville), Celite Super Floss (Johns-Manvill)
e), AEROSIL 200 (Nippon Aerosil), AEROSIL 300
(Nippon Aerosil), Super Light (Kono Shoten), Snow Light (Mori Shoten), Radio Light W (Showa Chemical) (b) Calcium silicate; Microcell C (Johns-Manville), Microcell T-38 (Johns-Manville) (C) Aluminum silicate; P-820 (Deggossa), Perlite 54 (Tokyo Perlite), talc (magnesium disilicate) (d) Talc; PKN (Hayashi Kasei), Micro White (Hayashi Kasei) (e) Calcium carbonate Softon SS (DOW) (2) Organic blocking inhibitor Higher fatty acid polyvinyl ester, dicarboxylic ester amide, n-octadecyl urea, N, N'-dioleyl oxamide To give a representative example of a surfactant that is preferably incorporated in view of the point, as the cationic surfactant, Primary amine salt,
There are tertiary amines, quaternary ammonium compounds, and pyridine derivatives, and as anionic activators, fatty acid metal salts,
There are alkyl sulfates, alkyl naphthalene sulfonates, and succinate sulfonates, and nonionic surfactants include partial fatty acid esters of polyhydric alcohols, ethylene oxide adducts of fatty alcohols,
Examples include fatty acid ethylene oxide adducts, fatty amino or fatty acid amide ethylene oxide adducts, alkylphenol ethylene oxide adducts, and alkyl naphthol ethylene oxide adducts.Examples of amphoteric activators include carboxylic acid derivatives and imidazoline derivatives. .

Further, various additives can be added to improve various characteristics. Representative examples of the additives are described below.

The resin composition of the present invention is used for various thermoplastic resin products such as packaging materials for photographic light-sensitive materials which are required to have light-shielding properties.

Examples of the packaging material for a photographic light-sensitive material of the present invention include the following.

(A) Magazine / instant film pack, shell of disc film or floppy, cassette, cartridge, container body for photographic film cartridge and its cap, microfilm, instant film or VT
Injection-molded light-shielding containers such as hinged cases for R, plastic cases for movies, etc. (b) Light-room loading for minilab magazines, phototypesetting magazines, instant film packs, etc., such as light-shielding telemping cloth, curtains, light-shielding films, and light-shielding pads. Magazine light-shielding member (c) Various light-shielding films (single-layer film, multilayer co-extruded film, laminated film), light-shielding paper, support, light-shielding bag (b) Multi-light-shielding tape, light-shielding adhesive, light-shielding hot melt, light-shielding foam Sheet, light-shielding paper box, etc. The resin composition of the present invention is used for the packaging material for photographic photosensitive materials as described above, but the manner of using the resin composition is appropriately changed depending on the packaging material for each photographic photosensitive material.

For example, in the case of a photographic film spool, a container for a photographic film cartridge, various cases, etc., the resin composition of the present invention is directly injection molded.

As the thermoplastic resin preferably used for the photographic film spool, for example, polystyrene resin, synthetic rubber blended polystyrene resin, synthetic rubber copolymer polystyrene resin, homopolypropylene resin, propylene / α-olefin block copolymer resin, propylene / α-olefin random Copolymer resin, high-density polyethylene resin, ethylene / α-olefin copolymer resin, polyamide resin, acrylonitrile / styrene / butadiene copolymer resin, resins blended with one or more of these resins, various modifiers and additives The above various modified resins containing an agent can be used.

In the case of a light-shielding film, a film using the resin composition of the present invention alone, or a multi-layer coextruded film of two or more layers, or a flexible sheet, a thermoplastic resin film bonded to this film via an adhesive layer or bonded thereto It may be composed of multiple layers directly laminated without interposing an agent layer.

As the thermoplastic resin preferably used for the light-shielding film, for example, ethylene / α-olefin copolymer resin,
Low-density polyethylene resin, high-density polyethylene resin, medium-density polyethylene resin, various polypropylene resins, ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin, polyamide resin, polyester resin, modified polyolefin resin, ionomer and There are blended resins with one or more of these resins.

As the flexible sheet, a thermoplastic resin film, for example, various kinds of known films such as polyethylene resin, ethylene copolymer resin, polypropylene resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyamide resin, polycarbonate resin, polyester resin, and the like, and There are these modified resin films or these biaxially stretched films. In addition, metal thin film processed film (typically aluminum vacuum deposited film), cellulose acetate film, cellophane film, regenerated cellulose film, eval resin film, paper, synthetic paper, metal foil (typically aluminum foil), nonwoven fabric, etc. There is.

Particularly preferred flexible sheets are various papers having a basis weight of 20 to 400 g / m ² which do not affect the photosensitive material (unbleached kraft paper, semi-bleached kraft paper, bleached kraft paper, hineri base paper, clupak paper, duo stress) Paper, white paperboard, photographic base paper, pure white roll paper, coated paper, imitation paper, glassine paper)
It is.

[Action]

In the resin composition of the present invention, vitamin E enhances light-shielding power, reduces the amount of light-shielding substance added, and prevents oxidation of the resin. Lubricants improve film formability and the like.

〔Example〕

An embodiment in which the packaging material for a photographic light-sensitive material of the present invention is a light-shielding film will be described with reference to FIGS.

1 to 8 are partial cross-sectional views showing the layer structure of the light-shielding film.

The light-shielding film shown in FIG. 1 is composed of a single layer of the vitamin E-added film 1a made of the resin composition of the present invention.

The light-shielding film shown in FIG. 2 has a configuration in which a flexible sheet 3 is laminated on a vitamin E-added film 1a via an adhesive layer 2a containing a light-shielding substance.

The light-shielding film shown in FIG. 3 is constituted by a two-layer co-extruded film Ia comprising a vitamin E-added film 1a and a thermoplastic resin film 4a containing a light-shielding substance.

The light-shielding film shown in FIG. 4 is composed of a two-layer co-extruded film Ia comprising a vitamin E-added film 1a and a thermoplastic resin film 4 containing no light-shielding substance.

The light-shielding film shown in FIG. 5 is a flexible sheet and a vitamin E-added film laminated thereon by coating.
1a.

The light-shielding film shown in FIG. 6 has a structure in which a flexible sheet 3 is laminated via an adhesive layer 2 to a two-layer co-extruded film Ia comprising a vitamin E-added film 1a and a thermoplastic resin film 4a containing a light-shielding substance. It is.

The light-shielding film shown in FIG. 7 is a three-layer co-extruded film comprising a vitamin E-added film 1a, an intermediate layer 5a containing a light-shielding substance, and a thermoplastic resin film 4a containing a light-shielding substance.
IIa.

The light-shielding film shown in FIG. 8 has a three-layer coextruded film IIa comprising a vitamin E-added film 1a, an intermediate layer 5 containing no light-shielding substance, and a thermoplastic resin film 4a containing a light-shielding substance, and an adhesive layer. Flexible sheet 3 through 2
Are laminated.

Next, an embodiment in which the packaging material for a photographic photosensitive material of the present invention is a photographic film spool will be described with reference to FIGS. 9 and 10. FIG.

FIG. 9 is a front view of the photographic film spool, and FIG. 10 is a sectional view of the same.

9 and 10, reference numeral 11 denotes a film winding shaft,
Reference numeral 12 denotes a flange, and reference numeral 13 denotes a film insertion hole.

The product I of the present invention has a MI of 2.1 g / 10 minutes and a density of 0.920 g /
cm ³ ethylene / 4-methylpentene-1 copolymer resin 92.
LDPE resin with 0 wt%, MI 2.4 g / 10 min, density 0.926 g / cm ³
4.5% by weight, furnace carbon black (pH 8.0, average particle size 21mμ) 3.0% by weight, vitamin E 0.2% by weight, synthetic silica 0.1% by weight, calcium stearate 0.15% by weight,
A polyolefin resin composition comprising 0.05% by weight of a fatty acid amide was used.

And, with this polyolefin resin composition, a thickness of 50
A light-shielding blown film of μm shown in FIG. 1 was prepared.

Inventive product II The same resin composition as the inventive product I
92.05% by weight of 4-methylpetene-1 copolymer resin, 0.05% by weight of vitamin E, tetrakis [methylene-3-
(3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) propionate] The same resin composition as the product I of the present invention except that 0.10% by weight of a phenolic antioxidant having a structure represented by methane was added. Was used.

Then, the same light-shielding blown film as that of the product I of the present invention was prepared from this polyolefin-based resin composition.

Comparative product I As the resin composition, the same ethylene
92.5% by weight of 4-methylpentene-1 copolymer resin, 4.5% by weight of the same LDPE resin as Product I of the present invention, 3.0% by weight of furnace carbon black same as Product I of the present invention, 0.1% of synthetic silica
A polyolefin-based resin composition which did not contain vitamin E was used.

Then, the same light-shielding blown film as that of the product I of the present invention was prepared from this polyolefin-based resin composition.

The product III resin composition of the present invention includes 97.3% by weight of a polystyrene resin containing butadiene rubber having a butadiene rubber content of 1.8% by weight,
Furnace carbon black (pH 8.0, average particle size 21m
μ) 0.25% by weight of vitamin E, 0.2% by weight of vitamin E, 1.5% by weight of linear polydimethylsiloxane (viscosity of 20,000 centistokes), 0.25% by weight of calcium stearate, and 0.5% by weight of synthetic silica, silicon oxide. Using.

Then, a photographic film spool shown in FIGS. 9 and 10 was prepared by injection molding using this resin composition.

Comparative product II The same as the product III of the present invention except that the same polystyrene resin containing butadiene rubber as the product III of the present invention was 99.25% by weight, and vitamin E, linear polydimethylsiloxane and calcium stearate were not added. The same resin composition was used.

Then, the same photographic film spool as that of the product III of the present invention was prepared from this resin composition by injection molding.

 Table 1 shows the results of comparing these.

Evaluation is based on the following.

○… Excellent ▲… Problem, need to be improved ×… Not practical Test method * A Light-shielding * Light-shielding film Using a light-shielding film, create a three-way heat-sealed flat bag and then insert color photographic paper from the opening in the dark room. After bending the opening completely and sealing it with cellophane tape, leave it for 60 minutes under a xenon lamp of 80,000 lux and develop it. Evaluate the degree of fogging. * Spool for photographic film. After the product is completely shielded from light with the cap, the long boss side is up for 60 minutes under the xenon lamp of 80,000 lux and the short boss side is up.
Developed after standing 60 minutes, evaluate the degree of generation of fog ※ B lumps, occurrence of fish eye * 10 cm × 1 m of the light-shielding film shielding inflation film (0.1 m ²⁾
Visually inspect and evaluate the number of spots and fish eyes with a diameter of 0.3 mm or more generated inside * Spool for photographic film Visually inspect and evaluate the number of spots generated in one spool * C Blocking film Or a wrapper between the packaging materials * Shading film Evaluated by the ease of opening the cut opening after winding the shading inflation film in the form of a tube and then cutting with a razor * Photo film spool Resin used for photo film spool One of the 35mm wide and 75mm long test specimens formed by injection molding was attached to an inclined surface and one was attached to the bottom of a 200g load metal block. It overlaps so that it is in contact, and measures and evaluates the angle at which it begins to slide. The smaller the angle, the better.

* D Exfoliation voltage 35m wide with shading inflation film to be tested
m, an endless belt with a length of 1350 mm, and the endless belt is sent between a SUS roller with a load of 500 g and a SUS roller at a speed of 12 m / min. Evaluated from a value measured using a peeling belt voltage measurement device * E Hoisting torque (last torque) Evaluated from a value measured using a "Note 1 last torque" measuring device disclosed in JP-A-62-286033 [Effect of the Invention] In the present invention, by adding vitamin E together with the light-shielding substance, the light-shielding ability can be increased as compared with the case of using the light-shielding substance alone. Therefore, the amount of the light-shielding substance added can be reduced, the physical strength of the packaging material is improved, and the occurrence of bumps and fish eyes is suppressed, and the moldability, heat sealability, etc. are not deteriorated, and the cost is reduced. Can be provided. Further, the antioxidant action can prevent burning of the resin and the like, and does not adversely affect the photographic properties.

[Brief description of the drawings]

1 to 8 are partial cross-sectional views showing a layer structure of a light-shielding film which is one embodiment of the packaging material for a photographic photosensitive material of the present invention, and FIG. 9 is another embodiment of the packaging material for a photographic photosensitive material. FIG. 10 is a front view of a certain photographic film spool, and FIG. 1a ... Vitamin E-added film

Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location G03C 3/00 560 G03C 3/00 560N (56) References JP 1-2230657 (JP, A) JP JP-A-58-34843 (JP, A) JP-A-61-42303 (JP, A) JP-A-63-254180 (JP, A) JP-A-63-85539 (JP, A) JP-B-62-28172 (JP, A) JP-B-53-14262 (JP, B2) JP-B-53-9622 (JP, B2) U.S. Pat. No. 5,426,141 (US, A)

Claims (2)

(57) [Claims] (1) at least pH 6.0 to 9.0, average particle size 10 to 12
A resin composition for a photographic material, comprising a thermoplastic resin containing 0 mμ of carbon black, 0.02 to 0.5% by weight of vitamin E and 0.005 to 5.0% by weight of a lubricant. 2. A packaging material for a photographic light-sensitive material, wherein the resin composition according to claim 1 is used.