JPH03134657A - Packaging material for photographic sensitive material - Google Patents

Abstract

PURPOSE:To improve environmental resistance by using a carbon black, metallic powder, polyoxyethylene alkyl amine, fatty acid monglyceride, aliphat, acid amide, polydimethylsiloxane compd., and ethylene copolymer resin respectively at specific ratios. CONSTITUTION:The packaging material for photographic sensitive materials is constituted of a light shieldable polyolefin film 1a. The light shieldable polyolefin film 1a is constituted by incorporating 0.05 to 20wt.% carbon black and/or metallic powder, 0.01 to 0.5wt.% polyoxyethlene alkylamine, 0.01 to 0.5wt.% acid amide and/or polydimethylsiloxane compd., and>=5wt.% ethylene copolymer resin therein. As a result, the excellent bag making characteristic, hermetic heat sealability, light shieldability, and antistatic property are obtd. and the environmental resistance thereof is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a packaging material for photographic materials that has excellent bag-making suitability, heat-sealing properties, light-shielding properties, and antistatic properties.

[Conventional technology]

For materials such as photographic materials that lose their quality value when exposed to light, packaging materials that completely block light are used. In addition to the above-mentioned light-shielding properties, this packaging material must also have no pinholes, sealing properties, moisture-proofing properties, gas barrier properties, sufficient physical strength, and static (spark discharge) prevention properties.

However, it is difficult to combine these properties with a single film material, so conventionally, as shown in Fig. 1θ, polyester layer 11, adhesive layer 5, aluminum foil 6, light-shielding material, and A laminated film consisting of a polyolefin resin layer 12a containing an ionic antistatic agent was used (Japanese Patent Publication No. 63-26697).

The present applicant has also proposed a packaging material including a laminate in which a thermoplastic resin film made of a blend resin of high-density polyethylene resin and low-density polyethylene resin is formed on at least one side of a paper support (Japanese Patent Application Laid-Open No. 60-35728
Publication No.).

Furthermore, as shown in Figure 11, the average particle diameter is 200 m.
A packaging material comprising a light-shielding two-layer coextruded film consisting of a linear low-density polyethylene resin film layer 13a containing a light-shielding substance of +μ or less and a high-density polyethylene resin film layer 14a containing a light-shielding substance was used. (Japanese Unexamined Patent Application Publication No. 1985-85539).

[Problem to be solved by the invention]

The packaging material described in Japanese Patent Publication No. 63-26697 mentioned above not only has low physical strength and poor pinhole resistance, but also has some antistatic effect because it uses an antistatic agent. Permanence was poor, and static marks were likely to occur under low humidity. Moreover, the antistatic agent in the formed film bleeds out over time, resulting in stickiness and blocking, and heat sealing defects are likely to occur. Furthermore, even if the film was heat-sealed within a short period of time after being formed, the heat-sealability was significantly reduced.

Further, the packaging material described in JP-A-60-35728 has excellent antistatic properties and light blocking properties under normal environmental conditions, but static marks tend to occur under low humidity conditions. In addition, the physical strength was low, the pinhole resistance was poor, and the heat sealability was also poor.

Furthermore, the packaging material described in JP-A-63-85539 also has excellent antistatic properties under normal environmental conditions, but static marks tend to occur under low humidity conditions.

An object of the present invention is to solve these problems and provide a packaging material for photographic materials that has excellent heat-sealing properties, antistatic properties, sealing/light-shielding properties, suitability for bag making, anti-blocking properties, etc.

[Means to solve the problem]

In order to achieve the above object, the present invention provides carbon black and/or metal powder with large light shielding properties, antistatic properties, antiblocking properties, and anti-sticky effects, polyoxyethylene alkylamine and fatty acid monoglyceride with large antistatic effects, antistatic properties, and antistatic properties. This was achieved by using a predetermined amount of fatty acid amaii and/or polydimethylsiloxane compound, which has an anti-blocking effect, an anti-blocking effect, an effect of improving film formability and excellent lubricity, and an ethylene copolymer resin with excellent heat sealability. .

That is, the packaging material for photographic materials of the present invention contains 0.05 to 20% by weight of carbon blank and/or metal powder, and 0.05% by weight of polyoxyethylene alkylamine. O1~0.5
% by weight, 0.01 to 0.5% by weight of fatty acid monoglyceride, and 0.0% by weight of fatty acid amide and/or polydimethylsiloxane compound. It is characterized by comprising a light-shielding polyolefin resin film containing ~0.5% by weight of ethylene copolymer resin and 5% by weight or more of ethylene copolymer resin.

The packaging material for photographic light-sensitive materials of the present invention can ensure all the characteristics necessary as a packaging material for photographic light-sensitive materials even with a single layer film. It may also be a laminated film of a resin film and another film.

The light-shielding polyolefin resin film contains carbon black and/or metal powder in an amount of 0.05 to 20% by weight. If it is less than 0.05% by weight, it will be difficult to ensure the light-shielding properties necessary as a packaging material for photographic materials.
Moreover, the antistatic effect and antioxidant effect are small, and the effect of improving the physical strength of the ethylene copolymer resin film is small. 2
If it exceeds 0% by weight, the amount of detachment from the packaging material increases;
It contaminates photographic materials and reduces the physical strength and heat sealability of packaging materials.

The above carbon black is classified into gas black, anthracene black, acetylene black, furnace black, channel black, thermal black, lamp black, oil smoke, animal black, vegetable black, etc. depending on the raw material.

In the packaging material of the present invention, furnace carbon black is preferable in terms of light-shielding properties, cost, and improved physical strength, and acetylene carbon black, Ketchiene carbon black, and conductive carbon black are preferable in terms of antistatic properties, although they are expensive. . It is also preferable to mix the former and the latter according to the required characteristics, if necessary. However, Ketchien carbon black contains a large amount of impurities such as heavy metals, and tends to cause sensitivity abnormalities and capri, which may require countermeasures in the selection of raw materials and photographic emulsions.

Among these carbon blacks, pH 5 to 9, especially p
Acetylene carbon black having a t16 to 8 and an average particle diameter of 10 to 50 mμ is preferable. By using a material with such a pH and particle size, there is less fogging, less increase or decrease in photosensitivity, and a strong light-shielding ability (it is less likely to cause spots or fish eyes due to carbon black, etc.). A film can be obtained that has a number of advantages.

As the metal powder, aluminum powder, aluminum paste, etc. are preferable.

Aluminum paste is a product made into a paste in the presence of mineral spirit and a small amount of higher fatty acids such as stearic acid or oleic acid when making aluminum powder by a known method such as a ball mill method, stamp mill method, or atomization method. It's something I made. In the present invention, this aluminum paste and polyolefin thermoplastic resin (various polypropylene resins, various polyethylene resins, EVA resins,
EEA resin, EAA resin, etc.) are heated and kneaded, and low volatile substances (mainly mineral spirits with a strong odor) are removed using a vacuum pump, etc., and then used as the aluminum paste masterbatch resin.

In particular, it is preferable to use aluminum as the masterbatch resin in order to eliminate adverse effects and bad odors on photographic materials, and also in order to reduce the mineral spirit content in the film layer to 0.1% by weight or less. for example,
Even if the mineral spirit content in the masterbatch resin with an aluminum paste content of 40% by weight is 1.0% by weight, if you try to make the aluminum paste concentration in the light-shielding polyolefin resin film 2% by weight, 19 parts by weight of natural resin is kneaded with 1 part by weight of aluminum paste masterbatch, and some mineral spirit is removed as gas during film forming, so the mineral spirit content is 0. 0.5% by weight or less. the result,
Not only will there be no adverse effect on photographic materials, but odor will also be reduced.

Aluminum powder is made by pulverizing molten aluminum by atomizing, granulating, rotating disk dropping, evaporating, etc., or by crushing aluminum foil into flakes by ball milling, stamp milling, etc. Including those who did. Since aluminum powder alone is unstable, various known treatments are applied to make the surface of the aluminum powder inert. A known method for producing metal flakes is tlsP 4,4
69,282 specification and Japanese Patent Publication No. 37-6779,
It is described in Japanese Patent Publication No. 4G-6718, etc., and Japanese Patent Application Laid-Open No. 59-759 is a method for producing metal powder for filling synthetic resin.
There is a description in Publication No. 31, etc.

The light-shielding polyolefin resin film contains 0.01 to 0.5 fflff of polyoxyethylene alkylamine.
Contains i%. If it is less than 0.01% by weight, the packaging material for photographic light-sensitive materials will have almost no antistatic effect;
If the weight percentage is exceeded, bleed-out will increase over time, and blocking and stickiness will increase.

The polyoxyethylene alkylamine used in the present invention is
A type of nonionic surfactant that has an antistatic effect and is used as an antistatic agent.

- The formula is represented by the following, and the hydrocarbon group represented by R has 8 to 8 carbon atoms.
It is in the range of 22. The number of repetitions X and Y are both 1 or more, and X+Y is 2 to 14, preferably 2.
It is an integer of ~6.

The light-shielding polyolefin resin film contains 0.01 to 0.5% by weight of fatty acid monoglyceride. 0
．． If the amount is less than 0.01% by weight, there will be almost no antistatic effect on the packaging material for photographic light-sensitive materials, and if it exceeds 0.5% by weight, bleed-out will increase over time, resulting in increased blockiness and stickiness.

The fatty acid monoglyceride used in the present invention is R-COOCR.

and HOH Zhan H, OH It is a glycerin monoester of fatty acid represented by

The hydrocarbon group represented by R is a saturated or unsaturated hydrocarbon group having 8 to 22 carbon atoms.

This fatty acid monoglyceride has an antistatic effect and is used as an antistatic agent.

Moreover, stearic acid alpha monoglyceride using stearic acid whose fatty acid is a saturated fatty acid and whose number of carbon atoms is 18 is preferably used. As a commercially available product, the fatty acid monoglyceride content is 90% or more, and α monoglyceride accounts for most of the content.

The light-shielding polyolefin resin film contains 0.0% fatty acid amide and/or polydimethylsiloxane compound.
It is contained in an amount of 1 to 0.5% by weight. If it is less than 0.01% by weight, the lubricity, antistatic property, film formability, etc. of the packaging material for photographic light-sensitive materials will be poor; if it exceeds 0.5% by weight, it will not only have a negative effect on the photographic material. There will be a lot of blocking and sticky stuff.

The fatty acid amide used in the present invention provides an antistatic effect, an antiblocking property, and an improvement effect on film formability in addition to lubricity.

The product name and manufacturer name of fatty acid amide are shown below.

(1) Oleic Amidonia-Moslip CP (Lion Akzo) Neutron (Nippon Sakka), Neutron E-18 (Nippon Sakka),
Amide 0 (Nitto Chemical), Alflow E-10 (NOF), Diamond 0-200 (Nippon Kasei), Diamond G-200 (Nippon Kasei), etc. (2) Erucic acid amide: Alflow P-10 (NOF), Neutron S (
(Nippon Kasei) etc. (3) Lauric acid amide (4) Palmitic acid amide (5) Stearic acid amide: Alflo S-10 (NOF), Neutron 2
(Nippon Kasei), Diamond 200 (Nippon Kasei), etc. (6) Hisstearic acid amide (7) Bis fatty acid amide: Bisamide (Nippon Kasei), Diamond 200 Bis (Nippon Kasei), Armowax EBS (Lion Akzo), etc. There is.

The polydimethylsiloxane compound used in the present invention, including polydimethylsiloxane, is a silicone-based lubricant having the same effects as fatty acid amide, and various grades of polydimethylsiloxane and modified polydimethylsiloxane (Shin-Etsu Silicone, Toshiba silicone).

The polydimethylsiloxane compound has a viscosity of 1,000
Preferably, it is 100.0OOCPS (measured at 25°C).

If it is less than 1.0OOCPS, it will have an adverse effect on photographic light-sensitive materials (causing capri or abnormal photosensitivity), and 100.0O
If it exceeds OCPS, it is difficult to handle and becomes very expensive, making it difficult to put it into practical use.

The light-shielding polyolefin resin film contains 5% by weight or more of ethylene copolymer resin, preferably 10% by weight or more, particularly preferably 20% by weight. If it is less than 5% by weight, it will be difficult to improve hot tack properties and impurity sealing properties, and to ensure heat sealing strength over time.

Ethylene copolymer resin improves heat seal strength, hot tack properties, impurity sealing properties, etc., prevents the heat seal strength from decreasing over time after heat sealing, and improves bag breakage strength and
Improves impact drilling strength.

Representative examples of ethylene copolymer resins are shown below.

(1) Ethylene-vinyl acetate copolymer resin (2) Ethylene-propylene copolymer resin (3) Ethylene-1-butene copolymer resin (4) Ethylene-butadiene copolymer resin (5) Ethylene-pigmentation Vinyl copolymer resin (6) Ethylene-methyl methacrylate copolymer resin (7) Ethylene-methyl acrylate copolymer resin (8) Ethylene-ethyl acrylate copolymer resin (hereinafter referred to as EEA resin) (9 ) Ethylene-acrylonitrile copolymer resin (10
) Ethylene-acrylic acid copolymer resin (11) Ionomer resin (resin in which a copolymer of ethylene and unsaturated acid is cross-linked with metal such as zinc) (12) Ethylene-α-olefin copolymer resin (L-LDPE (13) Among ethylene copolymer resins such as ethylene-propylene-butene-1 ternary copolymer resin, it is relatively inexpensive, does not have an adverse effect on photographic materials, and has excellent film formability and heat sealability. L-LDPE resin and EEA resin are preferred because they have high bag breakage strength, impact puncture strength, and tear strength.

L-L D P E (Liner Low Den
Polyethylene resin is called the third polyethylene resin, and is a low-cost, high-strength resin that meets the demands of the times for energy and resource conservation, combining the advantages of both medium-low pressure and high-pressure polyethylene resins. .

This resin, which is preferred in the present invention, is a copolymer obtained by copolymerizing ethylene and an α-olefin having 3 to 13 carbon atoms, preferably 4 to 10 carbon atoms, by a low-pressure method or a high-pressure modification method, and is a short branched linear chain. It is a polyethylene resin with a structure of

Preferred α-olefins in terms of physical strength and cost include 1-butene, 1-octene, 1-hexene-1,4-methylpentene, and 1-heptene.

The density is generally considered to be that of low-medium density polyethylene resin, but commercially available products are often in the range of 0.87 to 0.95 g/c+1, and the melt index is 0.1 to 5.
Many of them are within the range of 0 g/10 minutes. In the present invention,
0.5-20g710 in terms of film formability and physical strength
minutes is preferred, and 0.8 to 10 g/10 minutes is particularly preferred.

The polymerization process for L-LDPE resin includes a gas phase method using a medium/low pressure device, a liquid phase method, and an ionic polymerization method using a high pressure improving device.

A concrete example of L-LDPE resin is shown below.

Ethylene-butene-1 copolymer resin G resin and NUC-FLX (UCC) Dowlex (Dow Chemical) Sflare (DuPont Canada) Marex (Philips) Stamilex (DSM) Efselen VL
(Sumiman Chemical) Neozex (Mitsui Petrochemical) Mitsubishi Polyethylene LL (Mitsubishi Yuka) 0 stone Nilex (Nippon Petrochemical) NUC Polyethylene-LL (Nippon Unicar) Idemitsu Polyethylene L
(Idemitsu Petrochemical) Ethylene-hexene-1 copolymer resin TUFLIN (UCC) TUFTHE
NE (Nippon Unicar) Ethylene/4-methylpentene-1 copolymer resin Urtozex (
Mitsui Petrochemical) Ethylene-octene-1 copolymer resin Stamilex (DSM) Dowlex
(Dow Chemical Company) Souffle
(DuPont Canada Inc.) MORETEC (Idemitsu Petrochemical) Among these L-LDPE resins, the one that is particularly preferable in terms of physical strength, heat seal strength, and film formability is a resin with a melt index (hereinafter referred to as Ml) of 0.8. ~10g
/10 minutes (JIS K-6760), density is 0.870
~0.940g/-cd (JIS K-6760),
And, α-olefins having 6 to 8 carbon atoms were obtained by liquid phase process and gas phase process.

Particularly preferred representative examples include the product names of Mitsui Petrochemical's Urtozex, which has 4-methylpentene-1, which has 6 carbon atoms, introduced into polyethylene as an α-olefin side chain; Idemitsu Petrochemical's MORETEC and D introduced several 8 octene-1
There are SM's Stamilex and Dow Chemical's Dowlex (L-
It is LDPE resin. ). Preferred representative examples obtained by the low-pressure gas phase process include TUFLIN from UCC, which introduces hexene-1 with 6 carbon atoms as the α-olefin side chain, and TUF from Nippon Unicar.
There are THENE etc.

In addition, recently released ultra-low-density linear low-density polyethylene resins with a density of less than 0.910 g/c+a, such as UCC
Also preferable are NUC-FLX manufactured by Co., Ltd. and Excelen VL manufactured by Sumitomo Chemical (both products use α-olefins containing 4 to 1 butenes).

Representative manufacturers of the EEA resin are Union Carbide (UCC) (USA), Nippon Unicar, Mitsubishi Yuka, Jumin Chemical, and Mitsui Polychemical.
etc. As a specific example, representative brand names of EEA resins currently marketed by Nippon Unicar ■, their comonomer content, melt index, and density are shown.

In addition, in the present invention, various additives can be used as necessary.

Next, typical examples of additives are described below, but the present invention is not limited thereto, and additives can be selected from all known additives.

(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 , organic tin-based, etc. (3) Flame retardants; Phosphoric esters, halogenated phosphoric esters, halogens (IJI, non-I materials, phosphorous-containing polyols, etc.) (4) Fillers: Alumina, kaolin, clay calcium carbonate, mica, talc, oxidation Titanium, silica, etc. (5) Reinforcing agents: Glass roving, metal fibers, glass fibers, glass milled fibers, carbon fibers, etc. (6) Blowing agents: Inorganic blowing agents (ammonia carbonate, soda bicarbonate), organic blowing agents, trolley-based, azo (7) Vulcanizing agents; vulcanization accelerators, accelerators, etc. (8) Deterioration inhibitors; UV absorbers, metal deactivators, peroxide decomposers, etc. (9) Coupling agents; Silane (10) Various thermoplastic resins, rubber, etc. (11) Nucleating agents; organic nucleating agents (dibenzylidene sorbitol compounds, etc.), inorganic nucleating agents (calcium carbonate, etc.) Representative examples of photographic materials packaged using the packaging material for photographic materials according to the present invention are shown below.

*Silver halide photographic materials (X-ray photographic film, printing film, black and white and color photographic paper, color film, printing master paper, DTR5 optical material, computer typesetting film and paper, microfilm, motion picture film, self-developing type) photographic light-sensitive materials, direct positive film and paper, etc.) *Diazonium photographic light-sensitive materials (4-morpholinobenzenediazonium chlorofilm, microfilm, copying film, printing plates, etc.) *Azide and diazide photographic materials (parallel) Azido Benshade, 4.
Photosensitive materials containing 4'diazide stilbene, etc., such as copying films, printing plates, etc.) *Quinonediazide photographic materials (ortho-quinonediazide, ortho-naphthoquinonediazide-based compounds, such as benzoquinone (1,2)-diazide) (2) Photosensitive materials containing -4-sulfonic acid phenyl ether, etc., such as printing plates, copying films, adhesion films, etc.) *Photopolymers (photosensitive materials containing vinyl monomers, printing plates, adhesion films, etc.) *Polyvinyl cinnamic acid ester type (e.g. printing film, IC resist, etc.) Photosensitive materials that change or deteriorate due to various types of light, oxygen, sulfur dioxide, etc., such as food products (butter, peanut bags, etc.) ,
margarine, snack products, snacks, sweets, tea, seaweed, etc.), pharmaceuticals (powdered and granular bagged medicines such as gastrointestinal medicines and cold medicines), dyes, pigments, photographic developing chemicals, photographic fixing chemicals,
Moisture-proof and light-shielding bags for long-term storage of printed materials and photographic prints containing toner, resins such as rubber and ABS, dyes and pigments, light-shielding readers for rolled photosensitive materials, magazine-less rolled photosensitive material packaging, packaging materials for bulk roll packaging, etc. It can also be applied to

[Effect]

The carbon black and/or metal powder imparts light-shielding properties and conductivity to the resin film, thereby providing antistatic performance. In addition, polyoxyethylene alkylamine and fatty acid monoglyceride provide antistatic properties as antistatic agents.
The fatty acid amide and/or the polydimethylsiloxane and/or the polydimethylsiloxane compound improve the antistatic effect when coexisting with the above-mentioned antistatic substance.

In addition, the fatty acid amide and/or polymethylsiloxane compound imparts lubricity to the resin film, and the polyoxyethylene alkylamine and fatty acid monoglyceride work together to improve pinhole resistance, abrasion resistance, and photographic material properties. Improves insertion, removal, and film formability.

The ethylene copolymer resin improves the heat-sealability of the resin film and prevents the heat-sealing strength from decreasing over time after heat-sealing.

〔Example〕

The layer structure of an embodiment of the packaging material for photographic materials of the present invention will be explained based on FIGS. 1 to 9.

1 to 9 are partial cross-sectional views showing the layer structure of the packaging material for photographic light-sensitive materials, respectively.

The packaging material for photographic materials shown in FIG. 1 is composed only of a light-shielding polyolefin resin film la containing at least various additives essential to the present invention.

The packaging material for photographic materials shown in FIG. 2 includes a light-shielding polyolefin resin film 1a containing at least various additives essential to the present invention, and a thermoplastic resin film 2 containing a light-shielding substance.
It is composed of a light-shielding two-layer coextruded film 3a consisting of a.

The packaging material for photographic materials shown in FIG. 3 is a light-shielding two-layered film consisting of a light-shielding polyolefin resin film 1a containing at least various additives essential to the present invention and a thermoplastic resin film 2 containing no light-shielding substance. It is composed of a coextruded film 3a.

The packaging material for photographic light-sensitive materials shown in FIG. 4 is a light-shielding double layer consisting of a light-shielding polyolefin resin film 1a containing at least various additives essential to the present invention and a thermoplastic resin film 2a containing a light-shielding substance. It is composed of a light-shielding blocking laminated film 4a in which a coextruded film 3a is laminated between thermoplastic resin films 2a and 28 by blocking adhesion.

The packaging material for photographic materials shown in FIG. 5 is a two-layer coextruded film consisting of a light-shielding polyolefin resin film 1a containing at least various additives essential to the present invention and a thermoplastic resin film 2 containing no light-shielding substance. 3a is laminated by blocking adhesive between thermoplastic resin films 2 and 2 to form a light-shielding blocking laminated film 4a.

The packaging material for photographic materials shown in FIG. 6 is a two-layer coextruded film consisting of a light-shielding polyolefin resin film 1a containing at least various additives essential to the present invention and a thermoplastic resin film 2 containing no light-shielding substance. 3a is laminated by blocking adhesive between the thermoplastic resin films 2 and 2 on one side of the light-shielding blocking laminated film 4a, and metal vapor deposition N6 is vapor-deposited on the biaxially stretched Blastig film 7 via the adhesive layer 5. A metal vapor-deposited biaxially stretched plastic film 8 is laminated on the metal vapor deposited layer 6 side, and a heat-resistant flexible sheet 9 is further laminated on the biaxially stretched plastic film 7 side via an adhesive layer 5. .

The packaging material for photographic light-sensitive materials shown in FIG. It is composed of a light-shielding three-layer coextruded film.

The packaging material for photographic light-sensitive materials shown in FIG. 8 contains a small amount of various additives essential to the present invention.
It is composed of a light-shielding three-layer coextruded film with 0.

The packaging material for photographic materials shown in FIG. 9 is constructed by laminating a two-wheel stretched plastic film 7 via an adhesive layer 5 on a light-shielding polyolefin resin film 1a containing at least various additives essential to the present invention. ing.

Next, present invention products I, ■, ■, ■, and ■ and comparison products I, ■
We will explain the test results comparing the characteristics of and ■.

Invention product I The layer structure corresponds to that shown in FIG.

The light-shielding polyolefin resin film 1a contains 4% by weight of furnace carbon black with an average particle size of 20 mμ, 6% by weight of high-pressure low-density homopolyethylene resin (hereinafter referred to as LDPE resin), and 40% by weight of carbon black using LDPE resin as a base resin. % concentration masterbatch pellet (10% by weight used), oleic acid amide 0.0
5% by weight, 0.10% by weight of dioxyethylene dodecylamine as a polyoxyethylene alkylamine-based antistatic agent, and 0.1% by weight of stearic acid alpha monoglyceride as a fat 117J monoglyceride-based antistatic agent. A certain MFR is 2.1g/10min,
Using an ethylene/4-methylpentene-1 copolymer trM resin composition with a density of 0.920 g/d, it was molded to a thickness of 100 I by blowing film molding at a blow ratio of 1.4.
! It was molded into m.

Invention product■ The layer structure corresponds to that shown in FIG.

The light-shielding polyolefin resin film 1a is made of 4% by weight of furnace carbon black with an average particle size of 20-μ, LD
PE resin/resin 6% by weight (used master patch pellets as in the invention product I), erucic acid amide 0.05% by weight,
Dioxyethylene dodecylamine 0.08% by weight as a polyoxyethylene alkylamine antistatic agent, stearic acid α as a fatty acid monoglyceride antistatic agent
Monoglyceride 0.15% by weight, MFR 2.1g/
10 minutes, using an ethylene/4 methylpentene-1 copolymer resin composition with a density of 0.920 g/cr1, and a thickness of 40 μm.
It was molded into m.

The thermoplastic resin film 2 has an MFR of 2.1 g/10
An ethylene copolymer resin film having a thickness of lOμ and made of an ethylene/4-methylpentene-1 copolymer resin having a density of 0.920 g/d was used.

The light-shielding two-layer coextruded film 3a was molded by a blown film method at a blow ratio of 1.4.

The light-shielding blocking laminated film 4a is obtained by bonding the light-shielding two-layer coextruded blown film with a blocking adhesive force having a peel strength of 1 g/15 au++ width.

Invention product■ The layer structure corresponds to that shown in FIG.

In the product (2) of the present invention, the resin composition of the thermoplastic resin film 2 has an MFR of 2.1 g/10 minutes and a density of 0.920 g.
/cj ethylene/4 methylpentene-1 copolymer resin 70% by weight, VFR 1.0g/10min, density 0.8
The resin composition is 30 percent ethylene-butene-1 copolymer resin with an ultra-low density of 90 g/d, and the blocking adhesive strength of the light-shielding blocking laminated film 4a is 2-4 in peel strength.
It is the same as the invention product (2) except that the width is g/15ann.

Invention product■ The layer structure corresponds to that shown in FIG.

In the product H of the present invention, instead of erucic acid amide in the light-shielding polyolefin resin film la, a viscosity of 20,000 CPS
This product is the same as the product (2) of the present invention, except that 0.05% by weight of polydimethylsiloxane is used.

Invention product V The layer structure corresponds to that shown in FIG.

The light-shielding blocking laminated film 4a is the same as the product (2) of the present invention.

The metallized biaxially stretched plastic film 8 is a biaxially stretched plastic film with a thickness of 15! ! An aluminum vacuum-deposited biaxially-stretched nylon resin film was used, in which an aluminum vacuum-deposited layer was thinly vacuum-deposited as the metal-deposited layer 6 to a thickness of 400 mm on the biaxially-stretched nylon resin film of Im.

The heat-resistant flexible sheet 9 has a paper strength of 150 g/m2 and is reinforced with an acrylamide resin containing 0.01% by weight of a nonionic surfactant that does not adversely affect photographic film.
unbleached kraft paper was used.

The light-shielding blocking laminated film and the aluminum vacuum-deposited biaxially stretched nylon resin film have a thickness of 13I as the adhesive layer 5! Furthermore, an aluminum vacuum-deposited biaxially oriented nylon resin film and unbleached kraft paper are combined with a 20-m thick LDPE resin extrusion laminate adhesive layer containing 4% by weight of carbon black as the adhesive layer 5. Lamination was carried out in one step using a tendon laminating machine using a fusion laminating adhesive layer.

Comparison product! The layer structure is similar to that in FIG.

Product I of the present invention is the same as Product II of the present invention, except that oleic acid amide, dioxyethylene dodecylamine, and α-stearic acid monoglyceride are removed from the light-shielding polyolefin resin film 1a.

Comparison product ■ The layer structure is similar to that in FIG.

Product H of the present invention is the same as Product 2 of the present invention except that erucic acid amide, dioxyethylene dodecylamine, and α-stearic acid monoglyceride are removed from the light-shielding polyolefin resin film la.

Comparison product■ The layer structure is similar to that in FIG.

Inventive product (2) is the same as inventive product (2) except that erucic acid amide, dioxyethylene dodecylamine, and stearic acid α-monoglyceride are removed from the light-shielding polyolefin resin film 1a.

The test results are shown in Table 1.

Note Evaluation method *1 Surface specific resistance 20'C60%RH using super insulation meter made by Kawaguchi Electric Seisakusho
Values measured in a constant temperature room controlled to
After taking the film in and out twice in a room at 30% RH, it is subjected to photographic processing, and static marks generated on the photographic film are visually observed and evaluated.

*Is there static electricity generated when opening the 3 bags?Create a quarter-sized three-sided sealed bag using each packaging material, stack 50 bags in a 20"C 30%RH room for 24 hours, and then store one bag in a dark room. The evaluation is based on the shock to the hand due to static electricity or the state of spark discharge when the mouth is opened step by step. [Effects of the Invention] Since the present invention is configured as described above,
), has excellent antistatic properties, does not generate static marks even under low humidity, and does not generate static electricity when opening the bag. In addition, it has excellent bag-making suitability, sealing and light-shielding properties, pinhole resistance, physical strength, and heat-sealing properties, and the heat-sealing strength after heat-sealing does not decrease.

[Embodiment]

The following embodiments are possible within the technical scope of the present invention.

(1) In the packaging material for photographic light-sensitive materials described in the claims, polyoxyethyl alkylamine, fatty acid monoglyceride, fatty acid, etc. Packaging material for photographic materials in which the total amount of amide and/or polydimethylsiloxane compound is 0.03 to 1.0% by weight

[Brief explanation of the drawing]

1 to 9 are partial cross-sectional views showing the layer structure of an embodiment of the packaging material for photographic materials of the present invention, and FIG. 10 and FIG.
FIG. 1 is a partial cross-sectional view showing the layer structure of a conventional example. 1a...Light-shielding polyolefin resin film (containing at least various additives essential to the present invention) 2.2a...Thermoplastic resin film 3a...Light-shielding two-layer coextruded film 4a...
...Light-shielding blocking laminated film a B indicating that it contains a light-shielding substance Blocking adhesive part Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6

Claims (1)

[Claims] 0.05-20% by weight of carbon black and/or metal powder and 0.01-20% of polyoxyethylene alkylamine
0.5% by weight and fatty acid monoglyceride 0.01-0
．． 5% by weight, 0.01 to 0.5% by weight of fatty acid amide and/or polydimethylsiloxane compound, and 5% by weight or more of ethylene copolymer resin. Packaging materials for photographic materials