JP2002278026A - Photographic film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photographic film using a polyester supporting body improved in terms of trouble on imperfect disconnection in a developing processing machine. SOLUTION: This photographic film is a roll photographic film obtained by housing unexposed photographic film taken up in a state where its one end is locked on the core of a winding shaft in a cartridge for photographic film in a light-tight state, and a disconnection load lightening means is provided between the final image frame of the photographic film and a locking end on the core side of the winding shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film in which a roll of unexposed photographic film is housed in a photographic film cartridge in a light-tight state, one end of which is locked to a core of a reel. The present invention relates to a photographic film that facilitates separation of a core and a photographic film.

[0002]

2. Description of the Related Art As a typical example of a roll-shaped color film or a black-and-white film generally used for photographing by being loaded into a camera, a resin cartridge or a metal film standardized according to the ISO standard while being wound on a shaft is used. 135-size film stored in a container such as a patrone.

[0003] The support of these 135-size films has a high transparency without optical anisotropy and an excellent property of decurling after development. TAC) is used. However, many organic solvents are used in the production of TAC films, and there is a drawback that the load on the natural environment is large.

On the other hand, polyester is known as a material capable of forming a film without using an organic solvent,
It is used as a support for sheet-like photographic films such as X-ray films and printing films. However, 1
When a polyester support is used for a 35-size film, the following matters become problems.

[0005] When a photographed photographic film is developed in a photo lab, the photographic film is separated from the patrone and then subjected to the development process. A mechanism for separating the patrone from the patrone is incorporated, and development is performed simply by setting the patrone in the developing processor. As a separating means, cutting of a film by a cutter is generally performed. However, in the case of a polyester support, there is a risk that poor cutting or a state where cutting is impossible may occur due to essential physical characteristics of polyester. This becomes a problem especially when the cutting blade is deteriorated.

[0006] It is possible to improve the frequency of replacing the cutting blade or to replace the cutting machine with a large one, but it is costly and maintenance is complicated.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a photographic film using a polyester support which has improved the problem of poor cutting in a developing processor. That is.

[0008]

An arrangement for achieving the object of the present invention will be described below.

1) A roll-shaped photographic film in which an unexposed photographic film wound on one end is fixed to a winding shaft core and stored in a photographic film cartridge in a light-tight state, and the final image of the photographic film is obtained. Between the top and the winding shaft core side locking end,
A photographic film comprising cutting load reducing means.

[0010] 2) The cutting load reducing means comprises a plurality of small holes provided so that the substantial cutting length in the width direction of the photographic film is 70% or less of the film width. The photographic film according to 1).

3) The small holes are 5 mm long in the length direction of the photographic film.
The photographic film according to 2), having a length of at least mm.

4) The cutting load reducing means is a bonding tape which is smaller than the photographic film in that the cutting load is smaller than that of the photographic film by locking the locking end of the photographic film on the winding shaft core side and the winding shaft core at a distance of 15 mm or more and 40 mm or less. The photographic film according to 1), which is characterized in that:

5) The photographic film has a thickness of 105 to 130 μm.
m. The photographic film according to any one of 1) to 4), comprising a transparent polyester support and a photosensitive layer.

6) A transparent polyester support is a polyester support in which three or more layers of an outer layer and an inner layer are laminated with an intermediate layer interposed therebetween, wherein the outer layer and the inner layer contain a copolymerized polyester, and at least one of the intermediate layers The photographic film according to 5), wherein the layer comprises a layer obtained by mixing a copolymerized polyester and a homopolyester.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 to 4, but the present invention is not limited to this embodiment.

FIG. 1 is a schematic view showing a state where a photographic film is pulled out from a patrone. FIG. 1A is a schematic perspective view showing a state in which all the effective photographing portions of the photographic film are extended and stopped. FIG. 1B is a schematic cross-sectional view taken along the line AA ′ of FIG. 1A showing a method of locking the winding core and the film. FIG. 1C is a schematic cross-sectional view along AA ′ of FIG. 1A showing another method of locking the core and the film.

In the drawing, reference numeral 1 denotes a patrone for storing an unexposed photographic film wound in a state of being locked at one end to a winding shaft core 101 in a light-tight state, 102 denotes a patrone main body, and 10 denotes a patrone main body.
Reference numeral 3 denotes a film slot having a light blocking member (not shown), and 104a and 104b denote caps for rotatably holding the core 101. Reference numeral 2 denotes a photographic film drawn from the patrone 1. Reference numeral 201 denotes a small hole serving as a cutting load reducing means disposed near the film slot 103 in a state where all the photographic film is unreeled from the patrone 1 and stopped. Reference numeral 3 denotes a joining tape for locking the film to the core of the winding shaft. FIG. 1 (b) shows a locking method using a bonding tape to lock the film to the core of the winding shaft, and FIG. 1 (c) shows a film edge directly locking the film to the core of the winding shaft. This is a locking method for fixing the portion to the core of the winding shaft.

FIG. 2 is a partial schematic plan view showing an arrangement position of the cutting load reducing means. In the figure, P is the film entrance 1
The distance from 03 to the end of the small hole 201 which is the cutting load reducing means is shown. The distance P is desirably 2 to 15 mm. 2m
If it is less than 15 m, the cutting blade may come off from the small hole due to the variation of the cutting device of the automatic developing machine.
When the distance exceeds m, the final image frame may be covered by a small hole depending on the type of camera. Q indicates the length in the length direction of the photographic film of the small hole as the cutting load reducing means, and the length Q
Is preferably 5 to 30 mm. If the length is less than 5 mm, the cutting position may be deviated depending on the type of the developing machine.
If it exceeds mm, depending on the type of camera, a film shift may occur, and the final image frame may hang over the small hole.

As described above, by making the small holes elongated in the length direction of the photographic film, it is possible to prevent the cutting load from changing even if the cutting position is shifted. Other symbols are the same as those in FIG.

FIG. 3 shows a small hole 201 as a cutting load reducing means.
It is a partial schematic diagram which shows the example of. 3A shows the case of a rhombus shape, FIG. 3B shows the case of a long pore shape, FIG. 3C shows the case of a square shape, and FIG. Show the case. The symbols are the same as those in FIG.

As shown in FIG. 3, the size of the small hole 201,
The shape and number can be appropriately selected and combined so as to be sufficient to reduce the cutting load.
0-70% is desirable. It is preferably from 10 to 60%, particularly preferably from 10 to 50%. If it is less than 10%, the cutting load is small, but the photographic film may be twisted or distorted, or may be cut carelessly.
If it exceeds 70%, a poor cutting blade may cause poor cutting.

FIG. 4 is a schematic view showing another example of a state where the photographic film is drawn from the patrone. FIG. 4A is a schematic perspective view showing a state in which all the photographing effective portions of the photographic film are fed out and stopped from the patrone in which the winding core and the photographic film are locked by the joining tape.
FIG. 4B is a schematic cross-sectional view along the line BB ′ of FIG. Reference numeral 202 denotes a winding shaft core side locking terminal where the end of the photographic film is bonded by the bonding tape 3, and reference numeral 301 denotes a bonding point between the winding shaft core 101 and the bonding tape 3. Other symbols are the same as those in FIG.

As shown in FIG. 4, when all of the effective photographing portions of the photographic film are unreeled and stopped, the joining tape 3 for locking the photographic film to the core of the photographic film comes out of the film slot 103. By making the cutting load of the bonding tape smaller than that of the photographic film, the cutting becomes easier. The distance from the locking terminal 202 of the photographic film to the joining point 301 of the winding core 101 and the joining tape 3 is 15 to 40 mm.
And more preferably 15 to 30 mm. 15m
If it is less than m, the joining tape 3 does not come out of the film entrance 103, which makes cutting difficult, which is not preferable. 40m
If it exceeds m, the joining tape becomes unstable, and it becomes difficult to join the end of the photographic film to the joining tape, which undesirably lowers the production efficiency.

The joining tape is not particularly limited as long as the cutting load is smaller than the polyester support of the photographic film. For example, a resin-impregnated paper, a polyethylene laminated paper, a polyethylene sheet or the like is used as a base material, and a material having an adhesive layer is used. Is mentioned. The adhesive layer has a glass transition temperature of a rubber represented by a styrene-isoprene-styrene block copolymer, a styrene-butadiene rubber, a polybutene rubber, a polyisoprene rubber, a butyl rubber, a natural rubber, a synthetic isoprene, etc. as a pressure-sensitive adhesive. To adjust, rosin, dammer, copal, hydrogenated rosin, rosin ester, indene chroman, picopearl, polyterpene, nitrocellulose, alkyd resin, butone, tackifier resin represented by xylene resin, dioctyl phthalate ( DOP), tricresyl phosphate (TCP), plasticizers such as dibutyl phthalate (DBP), rubber-based adhesives to which paraffin chloride, animal fats and oils, mineral oils and the like are added: methyl acrylate, ethyl acrylate,
Butyl acrylate, hexyl acrylate, acrylic acid 2
-Ethyl hexyl, isooctyl acrylate, octyl acrylate, acrylates such as decyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, hexyl methacrylate, methacrylic acid 2
Acrylic pressure-sensitive adhesives obtained by dissolving a homopolymer or copolymer of esters such as methacrylic acid esters such as ethylhexyl, isooctyl methacrylate, octyl methacrylate and decyl methacrylate in a suitable solvent; Esters and acrylic acid, methacrylic acid,
An acrylic pressure-sensitive adhesive obtained by dissolving a copolymer with a vinyl compound having a functional group such as itaconic acid, crotonic acid, and maleic acid in an appropriate solvent is used. When the copolymer having the functional group is used, a copolymer to which a small amount of an isocyanate-based organic crosslinking agent that reacts with the functional group is added in order to further enhance the heat-resistant aggregation effect is used.

Examples of the heat-sensitive adhesive include polyolefins such as polyethylene, vinyl acetate copolymers such as ethylene-vinyl acetate copolymer, and ethylene acrylate copolymers such as ethylene-ethylene acrylate and ethylene-isobutyl acrylate. Nylon 6, nylon 6,6,
Nylon 10, Nylon 12, polyamides such as N-methoxymethylated nylon, polyesters such as terephthalic acid, polyvinyl butyral, polyvinyl acetate, cellulose derivatives such as acetate, methyl cellulose, acetate butyrate, polymethyl methacrylate, etc. Polymethacrylates, polyvinyl ethers such as polyvinyl methyl ether, polyurethanes, polycarbonates, styrene-based block copolymers such as styrene-butadiene-styrene, styrene-butadiene, isoprene, synthetic rubbers such as butyl rubber or the like. One type or a mixture of two or more types selected from different special rubber-based or acrylic copolymers may be used.

The thickness of the polyester support of the present invention is 10
5-130 μm is desirable. If the thickness is less than 105 μm, the film may bend during transportation depending on the developing machine, and if it exceeds 130 μm, the film may be cut poorly depending on the automated developing machine.

The polyester support of the present invention is desirably a laminated polyester support having two or three or more polyester films. When the polyester support is formed by laminating two polyester films, the polyester support is formed from copolymerized polyester. It is preferable that the support is a laminated polyester support in which a layer formed by mixing a copolymerized polyester and a homopolyester (a mixed layer) is laminated.

When the support is formed by laminating three or more layers, the outer layer means the side on which the back layer is provided with the intermediate layer interposed therebetween, and the inner layer means the photosensitive layer is provided with the intermediate layer interposed therebetween. Pointing to the side. The inner layer and the outer layer may be different copolymer polyesters, but are preferably the same copolymer polyester from the viewpoint of cost and interlayer adhesion. The configuration of the intermediate layer is not particularly limited, but from the viewpoint of interlayer adhesion and cost, for example, a mixed layer single layer, or a mixed layer / homopolyester layer /
A configuration such as a mixed layer is preferable, and at least one of the layers is preferably a mixed layer of a copolymerized polyester and a homopolyester used for the outer layer.

When the polyester film is formed by laminating three or more layers, the inner layer and the outer layer are made of copolymerized polyester, and at least one of the intermediate layers is made of a copolymerized polyester used for either the inner layer or the outer layer. A laminated polyester support which is a layer (mixed layer) in which a homopolyester is mixed is preferred.

The thicknesses of the inner layer and the outer layer of the polyester support of the present invention are preferably asymmetrical in that the inner layer is thinner than the outer layer. As a result, it is possible to obtain an effect of making it difficult to form a curl when the photographic constituent layer is applied and reducing the influence of the curl. In the case of two layers, it is asymmetric as it is. When the polyester film has three or more layers, at least one or more of the copolymerization components, the copolymerization ratio and the film thickness of the inner layer and the outer layer can be made different between the inner layer and the outer layer to be asymmetric. From the viewpoint of cost and equipment, it is easiest to change the film thickness using the same copolyester resin.
At this time, in the case of two-layer lamination, the mixed layer side, and in the case of three or more layers, the copolymer component is small. Is preferred.

Next, the polyester used for the polyester support of the present invention will be described. The homopolyester used in the present invention is a polyester containing one kind of aromatic dibasic acid and one kind of glycol, and the dibasic acid includes terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, and the like. Examples of the glycol include ethylene glycol, propylene glycol, butanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, diethylene glycol, and p-xylylene glycol. Among them, polyethylene terephthalate containing terephthalic acid and ethylene glycol as components is preferable.

The copolymerized polyester used for the polyester support of the present invention comprises at least one aromatic dicarboxylic acid having a metal sulfonate group and at least one polyalkylene glycol and / or polyalkyleneoxydicarboxylic acid as copolymer components. It is a copolyester containing an aromatic dibasic acid and glycol as main components, and the dibasic acid and glycol include those described above. Among them, copolymerized polyethylene terephthalate containing terephthalic acid and ethylene glycol as main components is preferable.

The aromatic dicarboxylic acid having a metal sulfonate group includes 5-sodium sulfoisophthalic acid, 2-sodium sulfoisophthalic acid, 4-sodium sulfoisophthalic acid, 4-sodium sulfo-2,6-naphthalenedicarboxylic acid or an ester thereof. Formable derivatives and compounds obtained by substituting sodium with another metal (eg, potassium, lithium, etc.) are used. The copolymerization ratio of the aromatic dicarboxylic acid component having a metal sulfonate group is preferably 4 to 10 mol based on all ester bond units in order to obtain a sufficient level of curl recoverability and easy curling. %.

As the polyalkylene glycol, polyethylene glycol, polytetramethylene glycol and the like are used. Of these, polyethylene glycol is preferable, and the molecular weight is not particularly limited, but is 300 to 20,000.
0 is preferable, and more preferably, 600 to 10,000,
In particular, those having a molecular weight of 1000 to 5000 are preferably used.
As the polyalkyleneoxydicarboxylic acid, polyethyleneoxydicarboxylic acid, polytetramethyleneoxydicarboxylic acid and the like are used. Of these, polyethyleneoxydicarboxylic acid is preferable, and the molecular weight is not particularly limited, but is preferably 300 to 20,000, and more preferably. The thing of 600-10,000, especially 1000-5000 is used preferably. The copolymerization ratio of the polyalkylene glycol and / or polyalkyleneoxydicarboxylic acid should be between 2 and 8 of the copolyester reaction product in order to obtain a sufficient curl recovery and a level of ease of curling that is not a problem. It is preferable that the content is mass%.

The copolyester used for the polyester support of the present invention may be further copolymerized with other components or blended with another polymer as long as the effects of the present invention are not impaired. Is also good.

In addition to the above, dibasic acids or derivatives thereof which can be used in the present invention include terephthalic acid, isophthalic acid,
Lower alkyl esters of phthalic acid and sodium isophthalic acid sulfonate (sodium sulfoisophthalic acid) (an ester-forming derivative such as anhydride and lower alkyl ester), 2,7-naphthalenedicarboxylic acid,
Aromatic dicarboxylic acids such as 1,5-naphthalenedicarboxylic acid, diphenyldicarboxylic acid, and diphenylether dicarboxylic acid and lower alkyl esters thereof (ester-forming derivatives such as anhydrides and lower alkyl esters):
Alicyclic dicarboxylic acids such as cyclopropanedicarboxylic acid, cyclobutanedicarboxylic acid and hexahydroterephthalic acid, and derivatives thereof (ester-forming derivatives such as anhydrides and lower alkyl esters): and adipic acid, succinic acid, oxalic acid, and azelaic acid Acids, aliphatic dicarboxylic acids such as sebacic acid and dimer acid and derivatives thereof (ester-forming derivatives such as anhydrides and lower alkyl esters) may be used in an amount of 10 mol% or less of the total dibasic acid.

Other dihydric alcohols that can be used include trimethylene glycol, triethylene glycol, tetramethylene glycol, hexamethylene glycol, bisphenol A, p, p'-dihydroxyphenylsulfone, and 1,4-bis. (Β-hydroxyethoxyphenyl) propane, p-phenylenebis (dimethylolcyclohexane) and the like can be mentioned. These may be used in an amount of 10 mol% or less of the dihydric alcohol.

The above-mentioned polyester may be one obtained by blocking a terminal hydroxyl group and / or a carboxyl group with a monofunctional compound such as benzoic acid, benzoylbenzoic acid, benzyloxybenzoic acid, methoxypolyalkylene glycol, or For example, it may be modified with a very small amount of a trifunctional or tetrafunctional ester-forming compound such as glycerin or pentaerythritol as long as a substantially linear copolymer can be obtained.

The polyester used in the polyester support of the present invention preferably contains an antioxidant. The effect is particularly remarkable when the polyester contains a compound having a polyoxyalkylene group. The type of antioxidant to be contained is not particularly limited, and various antioxidants can be used. Examples thereof include antioxidants such as hindered phenol compounds, phosphite compounds, and thioether compounds. Can be. Above all, an antioxidant of a hindered phenol compound is preferable in terms of transparency.

The content of the antioxidant is usually 0.01 to 2% by mass, preferably 0.1 to 0.
5% by mass. When the content of the antioxidant is small, a so-called fogging phenomenon in which the density of the unexposed portion of the photographic light-sensitive material becomes high tends to occur. When the content is too large, the haze of the film becomes high and the transparency may be poor. One of these antioxidants may be used alone, or two or more thereof may be used in combination.

The polyester used in the polyester support of the present invention preferably contains a dye for the purpose of preventing the light piping phenomenon. Dyes to be blended for this purpose are not particularly limited in type, but it is necessary to have excellent heat resistance in film production, and anthraquinone-based and perinone-based dyes are exemplified. Can be Further, as the color tone, gray dyeing is preferable as seen in general photographic light-sensitive materials. Examples of these dyes include the MACROLEX series manufactured by Bayer, the SUMIPLAST series manufactured by Sumitomo Chemical Co., Ltd., and the Diaresin series manufactured by Mitsubishi Kasei Co., Ltd. These may be used alone or in combination of two or more dyes. Can be mixed and used so as to obtain a necessary color tone. At this time, the spectral transmittance of the film is set to 400 to 700.
60 to 85% in the wavelength range of nm, and
In the wavelength range of 0 nm, the difference between the maximum and the minimum of the spectral transmittance is 10
% Is preferred in order to prevent the light piping phenomenon and to obtain a good photographic print.

There is no particular limitation on the method of adding the colorant, and the colorant may be added and colored at any stage from the polymerization of the polyester to the melt extrusion. The method of preparing so-called master pellets and diluting them appropriately and melt-extruding them is preferably used because the concentration can be easily controlled.
This method is effective when fine adjustment of the concentration is required, for example, when the recovered polyester is contained. The concentration of the dye in the master pellet is preferably 100 to 10,000 ppm.

When the same concentration of the dye is used for the polyester, the total amount of the dye increases in the case of a thick-film support as compared with the case where the dye is thin, and the transmittance decreases. If this increase in density is a problem, the density of layers other than the layer adjacent to the surface layer on the side where the emulsion layer is coated can be set lower.

The polyester support of the present invention may be provided with lubricity as required. The means for imparting lubricity is not particularly limited, but a method of adding external particles to the polyester to add inert inorganic particles, a method of depositing internal particles to deposit a catalyst to be added at the time of synthesis of the polyester, or a method of adding a surfactant to the film surface. Is generally applied.

Among these, the method of depositing internal particles, which can control the particles to be deposited relatively small, is preferred because lubricity can be imparted without impairing the transparency of the film. As the catalyst, various known catalysts can be used, but it is particularly preferable to use Ca and Mn because high transparency can be obtained. These catalysts may be used alone or in combination of two or more.

Further, since the polyester support that can be used in the present invention preferably has a multilayer structure, the above-mentioned functions such as oxidation prevention, light piping prevention, lubricity, and the like, or addition of various additives other than those described above, are not required. Although it can be added to all layers, it is preferably added at least to the surface layer. The transparency of the film can be increased by reducing or not adding the other layers.

The polymerization of the copolymerized polyester used for the polyester support of the present invention can be carried out by a usual known method. That is, after transesterification of the dicarboxylic acid component and the glycol component, a polycondensation can be obtained by polycondensation under high temperature and reduced pressure, and in this case, an aromatic dicarboxylic acid having a metal sulfonate group as a copolymer component or polyethylene. Glycol is added after the transesterification reaction to perform polycondensation.

The polyester used for the polyester support of the present invention has an intrinsic viscosity in the range of 0.35 to 0.70. Below this range, the vulnerability becomes insufficient,
If it exceeds this range, the mechanical strength will be too strong.

As a method for laminating the polyester, a conventionally known method can be used. For example, a plurality of extruders and a co-extrusion method using a feed block type die or a multi-manifold type die, melt extrusion of a single layer film constituting a laminate or other resin constituting a laminate on a laminate film from an extruder, and cooling. Examples include an extrusion lamination method of cooling and solidifying on a drum, and a dry lamination method of laminating a single-layer film or a laminated film constituting a laminate via an anchor agent or an adhesive as necessary. Among them, a co-extrusion method in which the number of manufacturing steps is small and adhesion between the layers is good is preferable.

A method for obtaining an unstretched sheet and a method for uniaxially stretching in the longitudinal direction can be performed by a conventionally known method.
For example, the raw material polyester is formed into pellets, and is dried by hot air or vacuum while applying heat. The drying temperature is preferably high as long as it does not undergo oxidative decomposition by heat.
The temperature is 0 to 200 ° C, preferably 140 to 180 ° C. Vacuum drying is preferably used because oxygen and moisture can be reduced and oxidation can be prevented. Drying is performed so that the water content is 100 ppm, preferably 30 ppm or less. Then, it is melt-extruded, extruded into a sheet shape from a T-die, brought into close contact with a cooling drum by an electrostatic application method or the like, and cooled and solidified to obtain an unstretched sheet.

Next, the obtained unstretched sheet is subjected to a heating operation such as a plurality of roll groups and / or an infrared heater to determine the glass transition temperature (Tg) of the polyester as Tg + 10.
This is a method of heating in a range of 0 ° C. and longitudinally stretching in one step or multiple steps. The stretching ratio is usually in the range of 2.5 to 6 times, and needs to be in a range where the subsequent transverse stretching is possible. The setting of the stretching temperature is preferably based on the highest Tg of the Tg of the polyester of each constituent layer.

The polyester film uniaxially stretched in the machine direction obtained as described above was subjected to Tg to Tm (melting point) -2.
It is preferable to perform transverse stretching while raising the temperature in a stretching region divided into two or more portions within a temperature range of 0 ° C., and then heat-set. The transverse stretching ratio is usually 3 to 6 times, and the ratio of the longitudinal and transverse stretching ratios is determined by measuring the physical properties of the obtained biaxially stretched film.
It is adjusted appropriately so as to have preferable characteristics. It is preferred that the stretching temperature is divided into at least two stages and more preferably three stages. More than that is acceptable, but problems such as the increase in size of the equipment arise. It is preferable that the temperature of each region is set so as to be higher in order, and the temperature difference is in the range of 1 to 50 ° C. In addition, non-contact stretching such as simultaneous biaxial stretching can also be preferably used because failure such as a scratch hardly occurs.

Next, heat setting is carried out. It is preferable that the polyester film which has been biaxially stretched before this is kept at a temperature not higher than its final transverse stretching temperature and at a temperature not lower than Tg-40 ° C. for 0.01 to 5 minutes.

When the polyester film biaxially stretched in the longitudinal and transverse directions is heat-set, the temperature is higher than the final transverse stretching temperature and within a temperature range of Tm−20 ° C. or less, and is divided into two or more regions. It is preferable to heat-set while raising the temperature. The heat setting time is usually 0.5 to 300 seconds.

The heat-fixed polyester film is usually cooled to Tg or less, cut off the clip holding portions at both ends of the polyester film and wound up. At this time, 0.1 mm in the horizontal direction within the temperature range not higher than the final heat setting temperature and not lower than Tg.
It is preferable to perform a 1 to 10% relaxation treatment. In addition, cooling
It is preferable to gradually cool from the final heat setting temperature to Tg at a cooling rate of 100 ° C. or less per second. The means for cooling and relaxation treatment is not particularly limited, and can be performed by a conventionally known means. In particular, it is preferable to perform these treatments while sequentially cooling in a plurality of temperature ranges from the viewpoint of improving the dimensional stability of the polyester film.

In the production of the polyester film, functional layers such as an antistatic layer, a slippery layer, an adhesive layer and a barrier layer may be provided before and / or after the stretching. At this time, various surface treatments such as corona discharge treatment and chemical treatment can be performed as necessary. Furthermore, for the purpose of improving the strength, stretching used for known stretched polyester films, such as multi-stage longitudinal stretching, re-longitudinal stretching, re-longitudinal-horizontal stretching, and horizontal / longitudinal stretching, can also be performed.

[0057]

EXAMPLES The present invention will be described below in detail with reference to examples, but embodiments of the present invention are not limited to these examples.

Example 1 <Preparation of biaxially stretched laminated polyester support> 0.1 part by mass of calcium acetate hydrate was added to 100 parts by mass of dimethyl terephthalate and 64 parts by mass of ethylene glycol, and transesterification was carried out by a conventional method. went. A solution of 5-sodium sulfodi (β-hydroxyethyl) isophthalic acid in ethylene glycol (concentration 35% by mass) was added to the obtained product.
Parts by mass (5.2 mol% / total acid component), 9.8 parts by mass of polyethylene glycol (number average molecular weight 3000) (7.8)
Mass% / polymer), 0.05 parts by mass of antimony trioxide and 0.13 parts by mass of trimethyl phosphate. Then gradually raise the temperature and reduce the pressure, 280 ° C, 0.5 ×
Polymerization was performed at 0.133 kPa to obtain a copolymerized polyester. Using this copolymerized polyester, Bayer dyes are kneaded at the following compounding ratio to prepare master pellets having a dye concentration of 2000 ppm. The copolymerized polyester and the master pellets are blended at a ratio of 9: 1, and polyester A is mixed. Obtained.

Macrolex Red EG 1 Macrolex Violet B 1 Macrolex Green G 1 On the other hand, a commercially available polyethylene terephthalate (PET, intrinsic viscosity 0.65) was used, and a master pellet was prepared in the same manner as described above. Was blended in a 9 to 1 ratio. This polyester and the obtained polyester A were blended by a tumbler type mixer so that the ratio by mass was 25:75, to obtain a polyester B.

Polyester A and Polyester B Obtained
And then vacuum-dried at 150 ° C. for 8 hours each, and then melt-extruded at 280 ° C. using three extruders, joined in layers in a T-die, and brought into close contact with the cooling drum while applying static electricity thereto. The mixture was cooled and solidified to obtain a three-layer laminated unstretched sheet.
At this time, polyester A is the inner layer, outer layer, polyester B
Is an intermediate layer, and the extrusion amount of each extruder was adjusted so that the thickness ratio of each layer was 1: 2: 1. This unstretched sheet was stretched 3.5 times in the machine direction at 90 ° C. using a roll-type longitudinal stretching machine.

The obtained uniaxially stretched polyester film was subjected to a first stretching zone of 100 ° C. using a tenter type transverse stretching machine.
At 50% of the total transverse stretching ratio in the second stretching zone 1
The film was stretched at 20 ° C. so that the total transverse stretching ratio was 3.6 times.
Next, heat treatment is performed at 100 ° C. for 2 seconds, and heat setting is further performed at 170 ° C. in the first heat setting zone for 5 seconds.
Heat set at 15 ° C. for 15 seconds. Next, the film was gradually cooled to room temperature over 30 seconds while relaxing 5% in the horizontal direction, and the thickness was 120 μm.
(Thickness of each layer 30 μm / 60 μm / 30 μm) to obtain a biaxially stretched laminated polyester support.

(Preparation of a roll-shaped photographic film) The obtained laminated polyester support was coated with Japanese Patent Application No. 10-94468.
No. 10-237123 and No. 10-245151, a mixed gas having a pressure of 760 × 133 Pa and a gas component of argon / hydrogen / nitrogen = 96/2/2 (pressure%) was introduced, and 350 W · A discharge plasma treatment in gas of min / m ² is performed.

Next, an undercoat layer lower layer coating solution u-1 is applied to one side so as to have a dry film thickness of 0.1 μm and dried. On the opposite side, the following antistatic layer coating solution as-2 was dried to a thickness of 0.3 μm.
m, and then coated on as-2 with the following protective layer lower layer coating solution b-1 to a dry film thickness of 0.8 μm and dried. Thereafter, the following sliding layer coating solution o-1 is further applied and dried on b-1 so as to have a dry film thickness of 0.02 μm, and then heat-treated at 120 ° C. for 2 minutes and wound up.

Next, Japanese Unexamined Patent Application Publication No. 2000-3052
A silver halide photographic light-sensitive material was obtained by coating the same photographic constituent layer as that used in the preparation of Sample 101 of Example 1 described in Japanese Patent Publication No. 30-301.

<Undercoating Layer Coating Solution u-1> Gelatin 10 g Compound (UL-1) 0.2 g Crosslinking agent (UL-2) 0.2 g Silica particles (average particle size 3 μm) 0.1 g With 1000 ml of water Finish.

<Antistatic Layer Coating Solution as-2> Gelatin 10 g Antimony-doped tin oxide fine particles SN100D (manufactured by Ishihara Sangyo Co., Ltd., solid content 30%) 150 g Compound (UL-1) 0.4 g Crosslinking agent (UL-2) ) Make up 7.5g 1000ml with water.

<Protective Layer Lower Layer Coating Solution b-1> Cellulose diacetate (55% acetylation degree, mass average molecular weight 180,000) 100 parts by mass Tolylene diisocyanate 17.0 parts by mass Crosslinkable PMMA particles (Soken Chemical Co., Ltd.) ) MX-150) 0.2 parts by mass Acetone 1130 parts by mass Cyclohexanone 280 parts by mass <Sliding layer coating solution o-1> Carnauba wax 7 g Toluene 700 g Methyl ethyl ketone 300 g

[0068]

Embedded image

The obtained silver halide photographic material was subjected to JI
It was cut to the size specified in "SK 1359-1982, 135-type film patrone", and one end was locked to the core of the reel and stored in the patrone in a light-tight state to obtain a roll-shaped photographic film.

The locking with the winding core was performed by a locking method without using a bonding tape as shown in FIG. 1C. Before cutting to a prescribed size and locking one end to the winding shaft core, a square small hole shown in FIG. Table 1 shows the samples stored in a light-tight state. Thirty samples of each sample were prepared and a cutting test was performed. In addition, the change of the substantial cutting length was performed by the number of small holes. The dimensions of the rectangular small holes were 3 mm in width and 10 mm in length.

The cutting test was performed using NPS-22 manufactured by Konica Corporation.
Using an 11J-type automatic developing machine, the cutting status was confirmed, and the results are shown in Table 1. The case where cutting was performed without any problem was marked as “○”.

[0072]

[Table 1]

From the results in the above table, the effectiveness of the present invention was confirmed. Example 2 When manufacturing the sample 102 of Example 1, the size of the rectangular small hole was 3 mm in width and the length was changed as shown in Table 2, and 30 samples were manufactured. A cutting test was performed using the same automatic processor, and the results are shown in Table 2. The case where cutting was performed without any problem was marked as “○”.

[0074]

[Table 2]

From the results in the above table, the effectiveness of the present invention was confirmed. Example 3 The silver halide photographic light-sensitive material prepared in Example 1 was used, cut in the same manner as in Example 1, and one end was fixed to the core of the reel, stored in a patrone in a light-tight state, and rolled. A film was obtained.

As shown in FIG. 4, the cartridge is stored in the patrone by a locking method using a bonding tape as shown in FIG. The distance to the junction was changed as shown in Table 3 to obtain a sample. In addition, 50 samples were prepared, and a cutting test was performed using the same automatic developing machine as in Example 1. The results are shown in Table 3.

In the cutability test, when all the pieces were cut without any problem, the result was evaluated as ○, and even when one of the 50 pieces was cut without any cut, a poor result was obtained.

The workability of joining with the film locking terminal was evaluated as ○ when all of the joining positions were not shifted, and x when there was a joining failure such that even one of the 50 joints was shifted. .

The bonding tape used was a base material obtained by laminating paper with polyethylene as a base material, and an adhesive layer coated with a styrene-isoprene-styrene block copolymer was used.

[0080]

[Table 3]

From the above table, the effectiveness of the present invention was confirmed. Example 4 A sample was prepared under the same conditions except that the thickness of the support was changed as shown in Table 4 when manufacturing the sample 101 of Example 1. 50 samples were made,
A cutting test was performed using the same automatic developing machine as in Example 1, and the results are shown in Table 4. The case where all 50 pieces could be cut without any problem was marked as “○”.

[0082]

[Table 4]

From the above table, the effectiveness of the present invention was confirmed.

[0084]

As described above, a polyester support can be used as a support for a general 135-size film.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a state where a photographic film is drawn from a patrone.

FIG. 2 is a partial schematic plan view showing an arrangement position of a cutting load reducing unit.

FIG. 3 is a partial schematic view showing an example of a small hole serving as a cutting load reducing unit.

FIG. 4 is a schematic view showing another example of a state in which a photographic film has been drawn from a cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Patrone 101 Roller core 102 Patrone main body 103 Film loading / unloading opening 104a, 104b Cap 2 Photographic film 201 Small hole 202 Locking terminal 3 Joining tape P Distance Q Length

Claims (6)

[Claims] 1. A roll-shaped photographic film in which an unexposed photographic film wound on one end is fixed to a winding core and stored in a photographic film cartridge in a light-tight state, wherein a final image of the photographic film is provided. A photographic film characterized in that a cutting load reducing means is provided between the top and the winding core side locking end. 2. The cutting load reducing means comprises a plurality of small holes provided so that the substantial cutting length in the width direction of the photographic film is 70% or less of the film width. The photographic film according to claim 1. 3. The small hole is 5 m long in the length direction of the photographic film.
The photographic film according to claim 2, having a length of at least m. 4. A cutting tape, wherein the cutting load reducing means is a joining tape smaller than a photographic film, wherein the cutting load for locking the winding core side locking end of the photographic film and the winding core at a distance of 15 mm or more and 40 mm or less is used. The photographic film according to claim 1, characterized in that: 5. A photographic film having a thickness of 105 to 130 μm.
The photographic film according to any one of claims 1 to 4, comprising a transparent polyester support and a photosensitive layer. 6. A polyester support in which a transparent polyester support is formed by laminating three or more layers of an outer layer and an inner layer with an intermediate layer interposed therebetween, wherein the outer layer and the inner layer contain a copolymerized polyester, and at least one of the intermediate layers is provided. The photographic film according to claim 5, wherein the layer comprises a layer obtained by mixing a copolymerized polyester and a homopolyester.