Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
  • G03C1/775—Photosensitive materials characterised by the base or auxiliary layers the base being of paper
  • G03C1/79—Macromolecular coatings or impregnations therefor, e.g. varnishes
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
  • G03C1/91—Photosensitive materials characterised by the base or auxiliary layers characterised by subbing layers or subbing means
  • G03C1/915—Photosensitive materials characterised by the base or auxiliary layers characterised by subbing layers or subbing means using mechanical or physical means therefor, e.g. corona

Definitions

• ABSTRACT A polyolefin-laminated paper support for photographic materials, especially suited for use as a support for a color photographic light-sensitive emulsion, having improved image-resolving power and high strength of adhesion to a photographic emulsion layer coated thereon, is obtained by the combination, in sequence, of a preliminary roughening treatment of the polyolefin surface in a conventional manner and subsequent surface activation treatment of the resultant roughened surface any conventional procedure such as corona discharge, flame treatment, ozone oxidation and the like.
• the present invention relates to a process for the surface treatment of a support used for a photographic material, and has as its object improving the adhesion between a photographic support and a photographic emulsion layer coated thereon, and providing a photographic material having high image-resolving power.
• baryta paper has been commonly used as a support for photographic printing papers.
• Baryta paper is usually prepared by coating a paper with a kneaded mixture of barium sulfate and gelatin.
• polyethylene-laminated paper has a hydrophobic surface of polyethylene it has such a poor adhesion to a hydrophilic photographic emulsion containing gelatin as a binder that the photographic emulsion has to be coated onto the support after rendering the surface of polyethylene hydrophilic by various surface-activation treatments, for example, a corona discharge treatment.
• polyethylenelaminated paper has an extremely poor image-resolving power for a printed picture image as compared to baryta paper. This is due to the fact that polyethylenelaminated paper has a transparent or translucent polyethylene film layer provided on a paper sheet, which itself is a very reflective substance, so that light transmitted through the photographic emulsion layer which is formed on the paper, i.e., the light which passes through the picture image portion, undergoes random reflection at all points, for instance, at the surface and interior of the polyethylene and at the interface between the polyethylene and the paper.
• the light-sensitive layer is in a multilayer comprising, successively from the support, a blue sensitive emulsion containing a yellow coupler, a gelatin-containing intermediate layer, a green sensitive emulsion containing a magenta coupler, another gelatin-containing intermediate layer, a red sensitive emulsion containing a cyan coupler and a protective coating of gelatin, which is inherently inferior in image-resolving power to a black-and-white photographic paper having a single photosensitive layer.
• a more serious problem is the fact that a polyethylene laminate has an 8-l0pt thick polyethylene layer on an opaque paper support (in addition to the above color light sensitive layer) which itself has a multilayered structure, so that it is much more difficult to obtain an improved imageqesolving power with such a polyolefin-coated paper used as the support for a color photographic emulsion.
• the process for the preparation of a photographic material according to the present invention comprises preliminarily roughening the surface of the polyolefin and then activating the roughened surface, e.g., by an electric discharge, a flame-treatment or an ozone oxidation, to thereby render the surface hydrophilic, and thereafter providing onto the resultant activated layer a photographic emulsion layer or an image-receiving layer for a diffusion transfer photographic process.
• polyolefin used throughout the specification and claims includes a homopolymer or copolymer which is composed of at least one monomer selected from the group consisting of ethylene, propylene, butylene, and pentene in an amount of at least about mole percent, and the component other than the olefin monomer in the resultant copolymer which may be polymerized with the olefin monomer in an amount of less than about 30 mole percent to modify its properties includes vinyl compounds such as vinyl acetate, styrene, acrylate, methacrylate, acrylonitriile, and the like.
• polystyrene resin polystyrene resin
• polystyrene resin polystyrene resin
• polystyrene resin polystyrene resin
• polystyrene resin polystyrene resin
• ethylene-propylene copolymers polystyrene resin
• ethylene-vinyl acetate copolymers polystyrene resin
• ethylene acrylate copolymers ethylene-methacrylate copolymers
• polyolefin includes-not only polyolefin homopolymers but also copolymers, so long as the classic properties attributable to the polyolefins are not lost.
• 30/70 molar proportions set out and the comonomers set out are not per se absolute recitations, but serve as a guideline to one skilled in the art as to generally used olefin proportions and the most representative modifying comonomers.
• phrases having a surface of polyolefin includes not only films constructed solely of polyolefin(s) but also papers or other substrates which are laminated with a layer of a polyolefin. In any event, any article having at least a surface of a polyolefin is included within the present invention.
• the thickness of the surface of the polyolefin is not overly critical, best results are obtained when the polyolefin surface presented is from about 20 to about 60 microns thick. The use of lesser thicknesses requires undue process control during surface roughening, and no substantial benefits are obtained by using a greater thickness, though if desired such may be used.
• the polyolefin may further contain pigments, dyestuffs, optical whitening agents, antistatic agents and the like additives, each of which imparts a certain effeet to the polyolefin without impairing the advantageous effect of the present invention.
• the polyolefin surface roughening treatment accord ing to the present invention can be carried out in a variety of ways, e.g., by a solvent roughening method characterized by contacting the surface of the polyolefin with a solvent at an elevated temperature which is capable of dissolving or swelling the polyolefin such as, for example, xylene, toluene, benzene etc., and then contacting the resultant surface with a liquid incapable of dissolving the polyolefin, such as methanol, ethanol, acetone etc.; roughening effected by tightly pressing the surface of the polyolefin onto a body having a rough surface to thereby transcribe the pattern of the roughened surface of the body onto the polyolefin surface; roughening by mechanically grinding or abrading the polyolefin surface; roughening by causing expansion or foaming of the polyolefin layer with a gas generated at elevated temperature from an expanding or foaming agent incorporated into the polyole
• the polyolefin surface provided with fine and minute 1 protrusions or pores is next subjected to a surface activation treatment by a conventional method known per se, including, for example, corona discharge, ozone oxidation, chromic acid treatment or a flame treatment, whereby the surface of the polyolefin is rendered hydrophilic or made to have an increased affinity or receptivity to water.
• a surface activation treatment by a conventional method known per se, including, for example, corona discharge, ozone oxidation, chromic acid treatment or a flame treatment, whereby the surface of the polyolefin is rendered hydrophilic or made to have an increased affinity or receptivity to water.
• the improved adhesion of the polyolefin surface will not decrease or disappear even after storage for a long time after the surface activation treatment before the photographic emulsion is coated thereon, unlike prior polyethylene coated papers having a smooth surface. For instance, a satisfactory adhesion to a photographic emulsion is obtained even when a photographic emulsion is coated after onto the polyethylene surface one half year after roughening by the use of solvent followed by a corona discharge treatment.
• a support treated in accordance with the process of this invention possesses a more excellent image-resolving power than that attained by the use of a conventional polyethylene-coated paper. This is attributable to the fact that light which has passed through the photographic emulsion layer (or imageforming part) is stopped at the minute protrusions of the polyethylene surface and does not further penetrate into the interior of the polyethylene layer, and thereby cause reflection only at the interface between the photographic emulsion layer and the polyolefin.
• EXAMPLE 1 A polyethylene resin containing 7 percent by weight of powdered titanium dioxide dispersed therein was coated on each side of a 150p. thick paper at a thickness of 2041.. The laminated paper was firstly contacted at one side with toluene heated to C for 2 seconds, and then with methanol heated to 250C for 30 seconds to thereby effect roughening of the polyethylene surface of the laminated paper.
• the surface of the polyethylene thus roughened was subsequently subjected to a corona discharge treatment by the use of a Lepel type corona discharge apparatus at an electric output of W and at an electrode passage speed of 2m/min. After allowing the polyethylene coated paper thus obtained to stand in a room over two months, it was then coated with a color photographic silver halide emulsion as described below.
• the adhesion strength between the emulsion layer so formed and the laminated paper support was so strong that it was impossible to strip or peel off between the emulsion layer and the polyethylene coat at the inter face thereof.
• the former sample i.e., the one coated with the emulsion after roughening
• the thus matted laminated paper was subjected to corona discharge treatment under the same conditions as were used in Example I and then allowed to stand in a room over two months.
• An image-receiving layer for use in a diffusion transfer photographic process as described below was coated on this paper.
• the adhesion strength between the image receiving paper and the support was 25 g/mm, whereas the adhesion strength was so small that natural peeling off occurred when the same polyethylene-laminated paper was treated by corona discharge under the same conditions without a previous roughening treatment and then coated with an image-receiving layer after being allowed to stand in a room for two months.
• aqueous silica aerogel dispersion (pH 3.8) was prepared and its pH was adjusted to approximately 10 by adding a 1N aqueous solution of caustic soda. Then the following aqueous solutions were added in the recited order to the dispersion to prepare the coating solution.
• a process for the production of a photographic material comprising a photographic layer coated on a polyolefin resin layer, which process comprises firstly roughening the surface of the polyolefin resin and then subjecting the thus roughened surface to a surface activation treatment to thereby render the surface of the polyolefin resin hydrophilic, thereafter coating the thus activated surface with a photographic layer comprising gelatin.
• polyolefin resin layer is from about 20 to about 60 microns thick.
• polyolefin is a polyolefin homopolymer or a copolymer of ethylene, propylene, butylene or pentene, the olefin comprising at least about mole percent of the copolymer.

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• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• General Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Seats For Vehicles (AREA)
• Laminated Bodies (AREA)
• Treatments Of Macromolecular Shaped Articles (AREA)
• Paper (AREA)

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Cited By (7)

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Citations (6)

• 1973
  • 1973-02-19 JP JP1921273A patent/JPS5321168B2/ja not_active Expired
  • 1973-02-22 US US00334549A patent/US3853585A/en not_active Expired - Lifetime

Patent Citations (6)

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