JP2007207646A - Forming device of conductive pattern - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forming device of conductive pattern which transfers stably a precursor without zigzaging in roll width direction at a continuous exposure part and has a high overall productivity. <P>SOLUTION: This is a device for forming a conductive pattern made of metallic silver on a substrate by applying an exposure treatment, a development treatment, and a removal treatment of a silver-halide emulsion layer while transferring a precursor having at least a physical development nuclear layer and a silver-halide emulsion layer in this order on a substrate. The forming device of conductive pattern comprises a winding part of the precursor of roll shape, a continuous exposure part to expose the precursor while transferring, a means of pulling the precursor of either a pair of nipping rollers or a suction roller, a development treatment part, a water washing treatment part for removing the silver-halide emulsion layer of the precursor, a drying part, and a winding part for winding up the precursor in roll. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a processing apparatus for forming a conductive pattern made of metallic silver on a substrate. More specifically, the present invention relates to a processing apparatus for a transparent conductive film that can be used for an electromagnetic wave shielding film, a touch panel, or the like in which a conductive pattern (for example, a lattice pattern) is formed on a transparent substrate.

  In recent years, with the rapid development of the information-oriented society, technologies related to information-related devices have rapidly advanced and become popular. Among them, the display device is used for televisions, personal computers, guidance displays for stations, airports, and other information. In particular, plasma displays have attracted attention in recent years.

  In such an information society, there is a concern about the influence of electromagnetic waves radiated from these display devices. For example, the influence on surrounding electronic devices and the influence on the human body are considered. In particular, the effects on human health cannot be ignored, and there is a need to reduce the intensity of the electromagnetic field applied to the human body. In response to such demands, various transparent conductive films (electromagnetic waves) Shield film) has been developed. For example, JP-A-9-53030, JP-A-11-122024, JP-A-2000-294980, JP-A-2000-357414, JP-A-2000-329934, JP-A-2001-38843, JP-A-2001-47549, 2001-2001. No. 51610, No. 2001-57110, No. 2001-60416, and the like.

  As a method for producing these transparent conductive films, conductive metals such as silver, copper, nickel, and indium are formed on a transparent resin film by sputtering, ion plating, ion beam assist, vacuum deposition, and wet coating. In general, a method of forming a metal thin film is commonly used. In recent years, a demand for a transparent conductive film is expanding, and a manufacturing method with low cost and high productivity is demanded.

  In view of the above circumstances, a method (silver complex diffusion transfer method) in which metallic silver is deposited on a physical development nucleus layer by a development process to form a conductive pattern is disclosed in Japanese Patent Publication No. 42-23745 (Patent Document 1). This is disclosed in Japanese Unexamined Patent Publication No. 2003-77350 (Patent Document 2). Furthermore, it is disclosed in International Publication No. 2004/007810 (Patent Document 3) that metal plating is performed using a conductive pattern made of metallic silver as a catalyst. In these methods, an original material (precursor) used to form a conductive pattern is prepared in the form of a roll, which is exposed to light and developed, and then wound into a roll. (Roll-to-roll) can be continuously processed to improve productivity.

  In the silver complex diffusion transfer method, an imagewise exposure process is performed before the precursor is developed. As an exposure method, it is preferable to connect the processing after exposure to one line, from the viewpoint of compacting the apparatus and shortening the processing time, and transporting a roll-shaped precursor (hereinafter referred to as precursor roll). A continuous exposure system that can perform the exposure process without stopping the process can be used effectively. As such a continuous exposure apparatus, for example, a plane scanning type exposure apparatus using various laser beams, or a copying camera in which an exposure unit described in Japanese Utility Model Publication No. 05-045695 scans and exposes a document in a slit shape. In addition, the transparent cylinder with the mask pattern drawn on the inner or outer peripheral surface is synchronized with the transport speed of the precursor roll, and exposure is performed from the inside of the transparent cylinder. The apparatus is disclosed in JP-A-2-293754, JP-A-2000-35677, JP-A-2000-75497 (Patent Documents 4 to 6), and the like.

  When a conductive pattern is formed by developing a precursor using the silver salt diffusion transfer method targeted by the present invention, in order to stably develop and fix the conductive pattern on a substrate (plastic film, etc.) During the development process, solids such as rolls must not be brought into contact with the film surface on the side where the conductive pattern is formed. It is preferable not to make strong contact with the film surface on the side where the conductive pattern is to be formed, and further non-contact is more preferable.

  However, in the process from development to drying, if the means for conveying the precursor while strongly holding it is not used, the length of both ends derived from the precursor substrate manufacturing method (extrusion, stretching) And the difference in tension between the two end portions make it easier for the precursor to meander after the development processing step, causing winding deviation in the width direction of the roll when it is wound into a roll. Further, the meandering of the precursor becomes larger as the transport path of the precursor becomes longer. Therefore, when the development processing using the silver complex diffusion transfer method and the continuous exposure described above are continuously performed, the meandering of the precursor in the roll width direction becomes large.

As described above, when the precursor is subjected to roll-to-roll exposure and development processing in succession, the above meandering significantly reduces the overall production efficiency. That is, meandering generated after the development processing step becomes larger as the processing length of the precursor becomes longer, and eventually affects the exposure step, which is the previous step of the development processing step. Thereby, the position in the roll width direction of the image pattern continuously exposed in the continuous exposure unit is not determined, and the process of cutting the completed conductive pattern into a sheet is complicated. In the worst case, imagewise exposure is not performed, and dimensional distortion occurs in the completed conductive pattern, resulting in a defective product.
Japanese Patent Publication No.42-23745 JP 2003-77350 A International Publication No. 2004/007810 Pamphlet JP-A-2-293754 JP 2000-35677 A JP 2000-75497 A

  Accordingly, an object of the present invention is to provide a conductive pattern forming apparatus having a high overall productivity, in which the precursor is stably conveyed without meandering in the roll width direction in the continuous exposure portion. Specifically, it is an object of the present invention to provide a conductive pattern forming apparatus in which at least the continuous exposure portion has no meandering in the roll width direction, and the development processing portion has little meandering in the roll width direction.

The above object of the present invention has been basically achieved by the following invention.
1) While carrying a precursor having at least a physical development nucleus layer and a silver halide emulsion layer in this order on the substrate, exposure treatment, development treatment, and removal treatment of the silver halide emulsion layer are performed. An apparatus for forming a conductive pattern made of metallic silver on a roll-shaped unwinding portion of the precursor, a continuous exposure portion that exposes the precursor while conveying the precursor, and a nip roller pair or a suction roller A means for pulling the precursor, a development processing section, a water washing processing section for removing the silver halide emulsion layer of the precursor, a drying section, and the dried precursor is wound into a roll. And a winding unit for forming the conductive pattern. 2) The continuous exposure unit according to 1) includes a transparent cylindrical body, a mask pattern disposed on an inner peripheral surface or an outer peripheral surface of the transparent cylindrical body, and an exposure source disposed inside the transparent cylindrical body. An apparatus for forming a conductive pattern, comprising: a light shielding member for regulating light emitted from the exposure source; and an adhesion mechanism for bringing the precursor into close contact with the outer periphery of the transparent cylindrical body.

  According to the present invention, there is no meandering in the roll width direction in the continuous exposure portion, and there is little meandering in the roll width direction in the development processing portion, so that a conductive pattern forming apparatus with high overall productivity can be provided.

  The precursor used to form the conductive pattern targeted by the apparatus of the present invention has at least a physical development nucleus layer and a silver halide emulsion layer in this order on the substrate. As such a precursor, the precursor currently disclosed by the said patent documents 1-3 can be mentioned.

  The apparatus of the present invention comprises a roll-shaped unwinding portion of the precursor so as to be processed by roll-to-roll, a continuous exposure portion that exposes the precursor while being conveyed, Means for pulling the precursor of either the nip roller pair or the suction roller, a development processing section, a water washing processing section for removing the silver halide emulsion layer of the precursor, a drying section, and a dried precursor A winding unit for winding the body into a roll. Here, the treatment by roll-to-roll is a method in which the precursor F wound in a roll shape (hereinafter referred to as a precursor roll) is continuously unwound, processed and then wound up again in a roll shape. is there.

  In the apparatus of the present invention, the precursor roll is imagewise exposed in the continuous exposure section, developed in the development processing section, unnecessary silver halide emulsion layers are removed in the water washing processing section, and dried in the drying section. It is wound up by a winding unit. As a result, a conductive pattern is formed on the substrate. When a transparent substrate such as a plastic resin film is used as the substrate, a transparent conductive film can be obtained. In the case of a transparent conductive film, a transparent conductive film having higher conductivity can be obtained by further metal plating using a conductive pattern (for example, a lattice pattern) made of metallic silver as a catalyst. If necessary, a laminating portion for performing a step of laminating a protective film or the like after the drying portion is provided.

  Hereinafter, an example of a preferred apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic sectional side view of an embodiment of the conductive pattern forming apparatus of the present invention, and FIG. 2 is a schematic sectional side view showing the operation of the precursor F and the transparent cylindrical body 1. FIG. 3A is a schematic front view of the continuous exposure unit 10 when the contact roller 4 is not pressed against the transparent cylindrical body 1, and FIG. 3B is a diagram illustrating the contact roller 4 pressed against the transparent cylindrical body 1. FIG. 3C is a schematic front view of the continuous exposure unit 10 when the contact roller 4 is pressed against the transparent cylindrical body 1.

  In the unwinding section of FIG. 1, the roll-shaped precursor 12 is mounted on the unwinding shaft 11 and is continuously unwound in the direction of the arrow and conveyed. The roll-shaped precursor 12 is internally wound (wound with the emulsion layer side face inside). The unwinding shaft 11 is connected to a tension control means 13 (not shown in FIG. 1) (for example, a powder brake), and the tension applied to the precursor F is controlled in the continuous exposure unit 10. The tension control means 13 applies a high tension to the precursor F in order to suppress the meandering of the precursor F in the continuous exposure unit 10, and a range of 4 kgf / m to 15 kgf / m is appropriate. The roll-shaped precursor 12 is provided with a lead film having a length corresponding to the entire length of the conveying path of the pattern forming apparatus at the uppermost winding and the lowermost winding, and the product portion of the precursor F is always conveyed. It is transported in a state where the speed and tension are controlled.

  The precursor F delivered from the roll-shaped precursor 12 is brought into contact with the adhesive roller 15 so that the dust adhering to both the front and back surfaces is removed by adhesion, and then sent to the continuous exposure unit. And the dust adhering to the adhesive roller 15 is periodically removed by a cleaning means (not shown) (for example, an adhesive roller whose surface can be peeled once every round) to prevent the dust from adhering to the precursor F again. . Other methods may be used as long as dust attached to the precursor F can be removed. For example, dust may be sucked and removed by a suction nozzle.

  As shown in FIGS. 1, 2, and 3 (a) to 3 (c), the continuous exposure unit 10 of the pattern forming apparatus of the present invention includes at least a transparent cylindrical body 1, an exposure source 2, a light shielding member 3, and a close contact. It comprises a roller 4, a bearing 5, a backup roller 6, a support member 7, a pressing screw 8, conveying rollers 9 a and 9 b, and a cleaning roller 16. An image pattern M is formed on the mask pattern (the outer peripheral surface of the transparent cylindrical body in FIG. 2) disposed on the inner peripheral surface or the outer peripheral surface of the transparent cylindrical body 1. As a method for forming the image pattern M, for example, a transparent original sheet on which the image pattern M is drawn is wound around the outer periphery of the transparent cylindrical body 1, and the image pattern is directly drawn on the inner peripheral surface or the outer peripheral surface of the transparent cylindrical body 1. There are methods.

  As shown in FIG. 2, an exposure source 2 and a light shielding member 3 are disposed inside the transparent cylindrical body 1. The exposure source 2 is a linear light source arranged in the axial direction of the transparent cylindrical body 1 and irradiates light in the radial direction of the transparent cylindrical body 1 from the inside of the transparent cylindrical body 1. As the exposure source 2, for example, a high-pressure mercury lamp, an electrodeless power source, a white light emitting diode, and the like, which are linearly arranged in the width direction of the precursor, and a fluorescent lamp are used. The light shielding member 3 covers the exposure source 2 in order to limit the irradiation light from the exposure source 2 to only a part of the side surface of the transparent cylindrical body 1. The inside of the light shielding member 3 is a reflecting plate in order to efficiently use the light from the exposure source 2. Therefore, as the light shielding member 3, a glossy iron plate, aluminum plate or the like with a matte and painted black outer surface is used, but other members may be used as long as they have the light shielding property and reflectivity.

  The transparent cylindrical body 1 is rotatably disposed on the transport rollers 9a and 9b. The precursor F passes through the lower side of the conveyance roller 9a, is wound around the outer periphery of the transparent cylindrical body 1 on which the image pattern M is formed on the outer peripheral surface, and passes through the lower side of the conveyance roller 9b to the developing tank 20. Be transported. Then, the transparent cylindrical body 1 is pressed against the transport rollers 9a and 9b by the tension applied to the precursor F, the transparent cylindrical body rotates in accordance with the movement of the precursor F, and the transparent cylindrical body 1 is irradiated with light. The precursor F is continuously exposed like the image of the image pattern M on the side surface (the portion whose range is designated as the exposed portion in FIG. 2). This eliminates the need for the precursor F to be stationary at the time of pattern exposure as in the case of using a normal intermittent feed type exposure apparatus, and the precursor F can be continuously conveyed to the next development processing section. As the transparent cylindrical body 1, it is sufficient that light having a desired wavelength can be transmitted. For example, acrylic resin, glass, or the like is used. The transport rollers 9a and 9b may have any surface quality that does not cause the precursor F to slip and damage the precursor F. For example, a roller made of nitrile rubber (NBR) or the like is used.

  As shown in FIG. 3, a contact roller 4 and an adhesive roller 16 are disposed around the transparent cylindrical body 1 in addition to the transport rollers 9a and 9b. As shown in FIGS. 3A and 3B, the contact roller 4 is a crown roller having a convex center portion, and both ends thereof are supported by bearings 5. A backup roller 6 is provided at a position facing the transparent cylindrical body 1 and is supported by a support member 7. A slot for receiving the bearing 5 is cut in the support member 7, and the bearing 5 can move linearly in the radial direction of the transparent cylindrical body 1 in the slot. A pressing screw 8 for pressing the bearing 5 in the radial direction of the transparent cylindrical body 1 is attached to the support member 7. The bearing 5 is pressed against the transparent cylindrical body 1 by pressing the bearing 5 in the radial direction of the transparent cylindrical body 1. Accordingly, the amount by which the contact roller 4 is pressed against the transparent cylindrical body 1 is adjusted by adjusting the screwing amount of the pressing screw 8.

  The contact roller 4 needs to be pressed to a position where at least the position where the diameter of the contact roller 4 is the maximum (approximately the central portion of the roller surface length and the central portion of the transparent cylindrical body 1) contacts the transparent cylindrical body 1, The state is shown in FIG. Then, by increasing the pressing amount of the contact roller 4, the contact amount between the contact roller 4 and the transparent cylindrical body 1 increases in both width directions of the transparent cylindrical body 1, and this state is shown in FIG. A plurality of the pressing mechanisms are provided around the transparent cylindrical body 1 and are pressed with an arbitrary pressing amount. By sequentially increasing the pressing amount from the upstream side in the transport direction of the precursor F, the transparent cylinder Air remaining between the body 1 and the precursor F can escape from the center of the transparent cylinder 1 in both width directions, and the adhesion between the transparent cylinder 1 and the precursor F can be improved, which is preferable. The pressing mechanism only needs to press the contact roller 4 against the transparent cylindrical body 1 with an arbitrary pressing amount in the radial direction of the transparent cylindrical body 1. For example, both ends of the contact roller 4 may be pressed with an air cylinder or the like.

  An adhesive roller 16 is disposed in contact with a portion of the outer periphery of the transparent cylindrical body 1 where the precursor F is not wound, and dust attached to the transparent cylindrical body 1 and the image pattern M is removed. And the cleaning mechanism similar to the thing used for the above-mentioned adhesive roller 15 is attached.

  As shown in FIG. 1, the roll-shaped precursor 12, the adhesive roller 15, and the exposure unit 10 are preferably covered with a dustless box (clean box) 17. The dust-free box 17 is equipped with a blower (not shown) and a high efficiency particulate air (HEPA) filter, and clean air is fed into the dust-free box 17 so that the inside of the dust-free box 17 is kept at a positive pressure, and the precursor F is dust-free. An air curtain (not shown) is provided at a portion discharged from the box 17 to prevent dust from entering from the outside.

  The exposed precursor F is conveyed to the development processing section through a means for pulling the precursor of either the nip roller pair or the suction roller, which is a feature of the present invention. In FIG. 1, the means for pulling the precursor of either the nip roller pair or the suction roller is arranged outside the dust-free box 17, but is housed inside the dust-free box 17 as necessary. May be. In FIG. 1, the nip roller pair 18 is used, and the precursor F is sandwiched by the nip roller pair 18, thereby preventing the precursor F from being meandering in the roll width direction of the nip roller pair 18. Yes. By attaching the nip roller pair 18 between the continuous exposure unit 10 and the development processing unit, the meandering in the roll width direction of the precursor F generated after the development processing is not transmitted to the continuous exposure unit, but the image pattern to be continuously exposed. The position in the roll width direction is constant. In FIG. 1, the nip roller pair 18 is one pair, but a plurality of nip roller pairs 18 may be used. The pressure applied to the nip roller pair 18 is suitably in the range of 0.1 MPa to 1 MPa, and preferably in the range of 0.2 MPa to 0.6 MPa. By using the nip roller pair 18, meandering in the roll width direction at least in the continuous exposure portion is prevented, and a pattern forming apparatus with less meandering after the development processing portion is provided. As a result, it is possible to provide a conductive pattern forming apparatus with high overall productivity. Further, when a suction roller is used as a means for pulling the precursor F, it is possible to apply a brake tension with the suction roller even if the roll-shaped precursor 12 is softly wound, and the precursor is more slippery. Even with F, a stable tension balance can be obtained.

  Before the precursor F is transported and enters the developing tank 20, the transport direction of the precursor F is reversed by the reverse roller 21. By the reversing roller 21 and the reversing roller 22 described later, the side surface of the emulsion layer is conveyed in a non-contact state in the developing tank. The developing tank 20 is preferably a vertically long and thin tank as shown in FIG. 1, and is small by reversing the transport direction while supporting the back surface of the precursor F with a reversing roller 22 provided in the lower part of the tank. Development time (time of immersion in developer) can be earned in the installation space.

  The capacity of the developing tank 20 varies depending on the width dimension of the precursor F, but usually about 30 to 50 liters is appropriate. The developer 23 is almost fully stored in the developing tank 20, and the developer consumed by the development process is replenished by a replenishing device (not shown). The temperature of the developing tank 20 is adjusted to a desired temperature range by a thermostat (not shown). In the present invention, the development start time is the time when the precursor F enters the developer 23 in the developing tank 20. Accordingly, the reversing roller 21 is the last solid material (roller) that contacts before the start of development, and the emulsion layer side surface of the precursor F is conveyed in a non-contact manner to a roller pair 42 described later.

  The precursor F carried out from the developing tank 20 is continuously developed in the air developing unit 24 and conveyed to the water washing processing unit 30. In the rinsing section 30, the precursor F is first heated by hot water ejected from the shower nozzle 31 to a layer above the physical development nucleus layer (a silver halide emulsion layer, an intermediate layer, a protective layer, etc. provided as necessary). ) Is removed by washing with water, and the metallic silver deposited on the physical development nuclei is exposed. Next, unnecessary components that could not be removed by the hot water ejected from the shower nozzle 31 are completely removed by the warm pure water ejected from the shower nozzle 41. An air knife 32 is attached between the shower nozzle 31 and the shower nozzle 41 so that hot water ejected from the shower nozzle 31 does not flow downstream. A shower nozzle 31 and a shower nozzle 41 are also provided on the back surface side of the precursor F, and the backing layer is removed by washing with water.

  The hot water ejected from the shower nozzle 31 is stored in the first washing tank 33 and is supplied to the shower nozzle 31 by the circulation pump 35. The capacity of the first rinsing tank 33 is suitably about 30 to 50 liters. A filter 34 is installed in the hot water piping path to remove floating substances such as silver sludge floating in the hot water. A heater (not shown) is attached to the first rinsing tank 33, and the temperature is adjusted to about 35 to 40 ° C.

  The hot pure water ejected from the shower nozzle 41 is supplied from a hot pure water tank (not shown), used for washing the precursor F, and then stored in the second washing tank 43. The capacity of the second rinsing tank 43 is suitably about 30 to 50 liters. A circulation pump 45, a filter 44, and a heater (not shown) are attached to the second washing tank 43. When hot water that can be heated by the heater is stored, the warm water is circulated in the second washing tank 43. While warming. Then, the suspended matter is removed by the filter 44.

  The second flush tank 43 is provided with an overflow port. When a certain amount of hot water is stored, it overflows and is replenished to the first flush tank 33. The first flushing tank 33 is also provided with an overflow port, and the overflowed warm water is collected into the waste liquid tank. By using warm water stored in the second water washing tank 43 as a replenisher for the first water washing tank 33, the replenisher can be saved.

  The precursor F from which unnecessary components have been removed by washing is passed through the roller pair 42, dried by the drying unit 50, and wound up in a roll shape by the winding shaft 61. The roller pair 42 is attached so as not to bring excess water adhering to the precursor F into the drying unit 50. The roller pair 42 is a sponge-like soft roller, and its pinching force is weak. The pressure applied to the roller pair 42 is suitably in the range of 0.05 MPa to 0.5 MPa, and preferably in the range of 0.05 MPa to 0.2 MPa.

  A hot air dryer 51 is installed in the drying unit 50, and the precursor F is dried by the hot air. The drying temperature may be 30 ° C. or higher, but 40 to 80 ° C. is appropriate, and 50 to 65 ° C. is preferable from the viewpoint of productivity. A tension control means 63 (for example, a torque motor) capable of driving and rotating the shaft is attached to the winding shaft 61. The tension control means 63 applies a high tension to the precursor F in order to suppress meandering of the precursor F after the developing unit 20, and a range of 4 kgf / m to 15 kgf / m is appropriate. Reference numeral 62 is a substrate in which a conductive pattern is formed and wound into a roll.

  Next, the precursor F in the present invention will be described in detail. The precursor F has at least a physical development nucleus layer and a silver halide emulsion layer in this order on a substrate. Further, a non-photosensitive layer may be provided between the outermost layer (protective layer) farthest from the substrate and / or between the physical development nucleus layer and the silver halide emulsion layer (intermediate layer). The non-photosensitive layer is a layer having a hydrophilic polymer as a main binder. As the hydrophilic polymer here, any polymer can be selected as long as it easily swells with an alkali treatment liquid described later and allows the alkali treatment liquid to easily penetrate into the lower silver halide emulsion layer.

  Specifically, gelatin, albumin, casein, polyvinyl alcohol, or the like can be used. Particularly preferred hydrophilic binders are proteins such as gelatin, albumin and casein. In order to sufficiently obtain the effect of the present invention, the binder amount of the non-photosensitive layer is preferably in the range of 20% by mass to 100% by mass, particularly 30% by mass with respect to the total binder amount of the silver halide emulsion layer. % To 80% by mass is preferable.

  This non-photosensitive layer may contain a surfactant, polymer latex, matting agent, slip agent, and the like known in the photographic industry as necessary. Further, as will be described later, it is preferable to contain a dye for improving safelight resistance. Further, the film can be hardened with a crosslinking agent as long as it does not prevent the peeling of the silver halide emulsion layer after the treatment.

  As the physical development nuclei of the physical development nuclei layer in the precursor, fine particles (having a particle size of about 1 to several tens of nm) made of heavy metals or sulfides thereof are used. Examples thereof include colloids such as gold and silver, metal fluids obtained by mixing water-soluble salts such as palladium and zinc, and sulfides. The fine particle layer of these physical development nuclei can be provided on the plastic resin film by vacuum deposition, cathode sputtering, or coating. From the viewpoint of production efficiency, a coating method is preferably used. The content of physical development nuclei in the physical development nuclei layer is suitably about 0.1 to 10 mg per square meter in solid content.

  The physical development nucleus layer may contain a hydrophilic binder. The amount of the hydrophilic binder is preferably about 10 to 500% by mass with respect to the physical development nucleus. As the hydrophilic binder, gelatin, gum arabic, cellulose, albumin, casein, sodium alginate, various starches, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, a copolymer of acrylamide and vinyl imidazole, and the like can be used. Preferred hydrophilic binders are proteins such as gelatin, albumin and casein.

  When a plastic resin film is used as the substrate, it is preferable to have a base layer made of protein (protein-containing base layer; hereinafter simply referred to as the base layer) between the substrate and the physical development nucleus layer. It is preferable to further have an easy adhesion layer such as vinylidene chloride or polyurethane between the base material and the base layer. As the protein used for the base layer, gelatin, albumin, casein or a mixture thereof is preferably used. The protein content in the base layer is preferably 10 to 300 mg per square meter.

  Examples of the physical development nucleus layer include inorganic compounds such as chromium alum, formalins, glyoxal, malealdehyde, aldehydes such as glutaraldehyde, N-methylol compounds such as urea and ethylene urea, mucochloric acid, 2,3- Aldehydes such as dihydroxy-1,4-dioxane, compounds having an active halogen such as 2,4-dichloro-6-hydroxy-s-triazine salt and 2,4-dihydroxy-6-chloro-triazine salt, Divinyl sulfone, divinyl ketone, N, N, N-triacroylhexahydrotriazine, compounds having two or more active three-membered ethyleneimino groups and epoxy groups in the molecule, as a polymer hardener Containing one or more of various protein crosslinking agents (hardeners) such as dialdehyde starch Preferred. Among these crosslinking agents, dialdehydes such as glyoxal, glutaraldehyde, 3-methylglutaraldehyde, succinaldehyde, and adipaldehyde are preferable, and glutaraldehyde is more preferable. The cross-linking agent preferably contains 0.1 to 30% by mass of the total protein contained in the base layer and the physical development nucleus layer, and particularly preferably 1 to 20% by mass.

  The physical development nucleus layer and the base layer can be applied by application methods such as dip coating, slide coating, curtain coating, bar coating, air knife coating, roll coating, gravure coating, and spray coating.

  For forming the silver halide emulsion grains used in the precursor silver halide emulsion layer, methods well known in the art such as forward mixing, back mixing and simultaneous mixing are used. Among them, it is preferable to use a so-called controlled double jet method, which is one of the simultaneous mixing methods and keeps the pAg in the liquid phase to be formed constant, from the viewpoint of obtaining silver halide emulsion grains having a uniform particle size. . In the present invention, the average grain size of preferable silver halide emulsion grains is 0.25 μm or less, particularly preferably 0.05 to 0.2 μm. There is a preferable range for the halide composition of the silver halide emulsion used in the present invention, and it is preferable that the chloride content is 80 mol% or more, and it is particularly preferable that 90 mol% or more is chloride.

  In the silver halide emulsion, a sulfite, lead salt, thallium salt, rhodium salt or complex thereof, iridium salt or complex thereof may coexist if necessary in the course of grain formation or physical ripening. Further, it can be sensitized by various chemical sensitizers, and methods commonly used in the art such as sulfur sensitization method, selenium sensitization method and noble metal sensitization method can be used alone or in combination.

  The ratio of the amount of silver halide contained in the silver halide emulsion layer of the precursor to the amount of gelatin is such that the mass ratio of silver halide (silver equivalent) to gelatin (silver / gelatin) is 1.2 or more, more preferably 1.5 or more.

  In each layer of the precursor, known photographic additives can be used for various purposes. These are described in Research Disclosure Items 17643 (December 1978) and 18716 (November 1979) 308119 (December 1989) or cited.

  Examples of the substrate used for the precursor include polyester resin such as polyethylene terephthalate, diacetate resin, triacetate resin, acrylic resin, polycarbonate resin, polyvinyl chloride, polyimide resin, cellophane, celluloid, and other plastic resin films.

  Next, the developer used for the development process will be described in detail. The developer is an alkaline solution containing a soluble silver complex salt forming agent and a reducing agent. The soluble silver complex salt forming agent is a compound that dissolves silver halide to form a soluble silver complex salt, and the reducing agent is a compound for reducing the soluble silver complex salt to deposit metallic silver on the physical development nucleus. .

  Soluble silver complex forming agents include thiosulfates such as sodium thiosulfate and ammonium thiosulfate, thiocyanates such as sodium thiocyanate and ammonium thiocyanate, sulfites such as sodium sulfite and potassium hydrogen sulfite, oxadoridones, 2-mercaptobenzoic acid and derivatives thereof, cyclic imides such as uracil, alkanolamines, diamines, mesoionic compounds described in JP-A-9-171257, thioethers described in USP 5,200,294, 5 , 5-dialkylhydantoins, alkylsulfones, and others. H. Examples thereof include compounds described in 474-475 (1977) of The Theory of the Photographic Process, 4th edition, edited by James.

  Among these silver halide solvents, alkanolamine is particularly preferable. By processing with a developer containing alkanolamine, high-density metallic silver is obtained, and the conductivity is improved.

  Examples of the alkanolamine include 2- (2-aminoethylamino) ethanolamine, diethanolamine, N-methylethanolamine, triethanolamine, N-ethyldiethanolamine, diisopropanolamine, ethanolamine, 4-aminobutanol, N, N -Dimethylethanolamine, 3-aminopropanol, N, N-ethyl-2,2'-iminodiethanol, 2-methylaminoethanol, 2-amino-2-methyl-1-propanol and the like.

  In the developer, these soluble silver complex salt forming agents can be used alone or in combination.

  As the reducing agent used in the developer, a developing agent known in the field of photographic development can be used. For example, hydroquinone, catechol, pyrogallol, methylhydroquinone, chlorohydroquinone and other polyhydroxybenzenes, ascorbic acid and its derivatives, 1-phenyl-4,4-dimethyl-3-pyrazolidone, 1-phenyl-3-pyrazolidone, 1-phenyl Examples include 3-pyrazolidones such as -4-methyl-4-hydroxymethyl-3-pyrazolidone, paramethylaminophenol, paraaminophenol, parahydroxyphenylglycine, and paraphenylenediamine. In the treatment liquid of the present invention, these reducing agents can be used alone or in combination.

  The content of the soluble silver complex salt forming agent is preferably 0.001 to 5 mol, more preferably 0.005 to 1 mol, per liter of the processing solution. The content of the reducing agent is preferably from 0.01 to 1 mol, more preferably from 0.05 to 1 mol, per liter of the treatment liquid.

  The pH of the developer is preferably 10 or more, and more preferably 11-14. In order to adjust to a desired pH, an alkali agent such as sodium hydroxide or potassium hydroxide, or a buffering agent such as phosphoric acid or carbonic acid is contained alone or in combination. The treatment liquid of the present invention preferably contains a preservative such as sodium sulfite or potassium sulfite.

Bromides such as potassium bromide and sodium bromide can be added to the developer. When the development is performed in the presence of an appropriate amount of bromide, the conductivity of the metallic silver obtained by the development is improved. A preferable bromide concentration is 1 × 10 ⁻⁴ mol / L or more and 1 × 10 ⁻² mol / L or less.

  The potassium ion concentration of the developer is preferably 70 mol% or more of the total alkali metal ions in the processing solution. Potassium ions may be supplied in any form and manner. For example, a method in which a hydroxide salt, a sulfite salt, a carbonate salt, a carboxylate salt, or the like is previously added to the developer can be mentioned.

  The electroconductive pattern obtained by the processing apparatus of this invention can be utilized for the transparent electroconductive film etc. which are used for uses, such as an electromagnetic wave shield film and a touch panel.

Schematic side sectional view showing an example of the processing apparatus of the present invention Schematic side sectional view showing operations of precursor F and transparent cylindrical body 1 of the processing apparatus of the present invention Schematic of the exposure unit of the processing apparatus of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transparent cylindrical body 2 Exposure source 3 Light-shielding member 4 Contact roller 12 Roll-shaped precursor 13 Tension control means 18 Nip roller pair 19 Drive motor 20 Developing tank 30 Washing process part 50 Drying part 62 Take-up roll 63 Tension control means F Precursor M Image pattern

Claims (2)

  While carrying a precursor having at least a physical development nucleus layer and a silver halide emulsion layer in this order on the substrate, exposure treatment, development treatment, and removal treatment of the silver halide emulsion layer are performed on the substrate. An apparatus for forming a conductive pattern made of metallic silver, comprising a roll-out portion of the precursor, a continuous exposure portion that exposes the precursor while conveying the precursor, and either a nip roller pair or a suction roller Means for pulling the precursor, a development processing section, a water washing processing section for removing the silver halide emulsion layer of the precursor, a drying section, and a roll for winding the dried precursor into a roll A conductive pattern forming apparatus comprising: a winding unit;   The continuous exposure unit according to claim 1, a transparent cylindrical body, a mask pattern disposed on an inner peripheral surface or an outer peripheral surface of the transparent cylindrical body, an exposure source disposed inside the transparent cylindrical body, An apparatus for forming a conductive pattern, comprising: a light shielding member for regulating light emitted from an exposure source; and an adhesion mechanism for bringing the precursor into close contact with the outer periphery of the transparent cylindrical body.

Images