WO1997022038A1 - Image-recording transparent film and imaged film - Google Patents

Image-recording transparent film and imaged film Download PDF

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Publication number
WO1997022038A1
WO1997022038A1 PCT/US1996/018524 US9618524W WO9722038A1 WO 1997022038 A1 WO1997022038 A1 WO 1997022038A1 US 9618524 W US9618524 W US 9618524W WO 9722038 A1 WO9722038 A1 WO 9722038A1
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WO
WIPO (PCT)
Prior art keywords
image
receiving layer
film
ofthe
resin
Prior art date
Application number
PCT/US1996/018524
Other languages
French (fr)
Inventor
Koji Kamiyama
Original Assignee
Minnesota Mining And Manufacturing Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining And Manufacturing Company filed Critical Minnesota Mining And Manufacturing Company
Publication of WO1997022038A1 publication Critical patent/WO1997022038A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/004—Organic components thereof being macromolecular obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/0046—Organic components thereof being macromolecular obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/508—Supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5227—Macromolecular coatings characterised by organic non-macromolecular additives, e.g. UV-absorbers, plasticisers, surfactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • B41M5/5272—Polyesters; Polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • B41M5/5281—Polyurethanes or polyureas

Definitions

  • the present invention relates to an image-recording transparent film which can be imaged by an electrophotographic method, and more particularly to a transparent color image-recording transparent film for use in an overhead projector (OHP).
  • OHP overhead projector
  • Japanese Kokai Publication No Sho 63-80273 discloses methods for improving smoothness ofthe toner layer after fixing, such as a method of fixing at high temperatures at which toner thoroughly melts, a method of fixing by using solvents such as toluene and the like, a method of polishing an imaged surface after fixing, and a method of applying a transparent coating composition which does not dissolve toner onto a fixed toner layer
  • a method of fixing at high temperatures at which toner thoroughly melts such as a method of fixing at high temperatures at which toner thoroughly melts, a method of fixing by using solvents such as toluene and the like, a method of polishing an imaged surface after fixing, and a method of applying a transparent coating composition which does not dissolve toner onto a fixed toner layer
  • a transparent coating composition which does not dissolve toner onto a fixed toner layer
  • Japanese Kokoku Publication No Hei 6-14232 proposes a method for improving compatibility between a binder and a colorant such as dyes and pigments which constitute toner, by contacting a plasticizer with a fixed toner layer.
  • a colorant such as dyes and pigments which constitute toner
  • Japanese Kokai Publication No. Hei 2-263642 (corresponding to US Patent Nos. 5,009,945, 5,229, 188 and 5,352,553) discloses a transparent image-recording film having an image-receiving layer on its surface containing a resin which has elasticity higher than that of a binder of toner and is compatible with the binder.
  • toner does not sink sufficientK in the image-receiving layer, because the image-receiving layer is harder than the toner, and a surface ofthe toner layer becomes uneven
  • the solubility parameter ofthe image-receiving layer is controlled (no plasticizer is added) in order to make the image-receiving layer and the toner compatible. According to the procedure, however, an image-receiving layer have to be prepared corresponding to a kind ofthe toner binder used individually, and the procedure lacks versatility.
  • Japanese Kokai Publication No. Hei 4-212168 (corresponding to US Patent No. 5,208,21 1) discloses a transparent image-recording film having an image-receiving layer thereon of which fluidizing temperature is lower than that of toner.
  • the transparent film does not produce a smooth surface of a toner layer when the toner has larger particle size than thickness ofthe image-receiving layer or when the toner coheres.
  • the present invention is made in order to solve the conventional problems, and an object ofthe present invention is to provide an image-recording transparent film which can record a transparent image by the use of an electrophotographic recording system, wherein the transparent image has high lightness and saturation and offers good color tone reproducibility in the use for OHP.
  • the present invention provides an image-recording transparent film comprising a light-transmitting film substrate and a light-transmitting image-receiving layer placed on at least one major surface ofthe film substrate, wherein said image-receiving layer contains (a) a thermoplastic resin selected from the group consisting of a polyester resin, a styrene/acrylic resin, an acrylic resin, an epoxy resin, an urethane resin and a polyolefin resin, and (b) a plasticizer which is compatible with the thermoplastic resin, thereby the object ofthe present invention is achieved
  • the present invention also provides an imaged film comprising the above described image-recording transparent film and an imaging material layer which is imagewise placed on a surface ofthe image-receiving layer thereof.
  • imaging material means a resin composition comprising colorant such as dyes and pigments and a thermoplastic resin
  • the imaging material generally has a melting point of from 60 to 150°C and a mean particle ze of from 3 to 50 ⁇ m, and examples include thermal transfer ink and toner for electronic copying
  • the imaging material is fixed to the image-recording transparent film by a fixing method such as a thermocompressing roller according to a desired pattern to form an imaging material layer on a surface ofthe image-receiving layer.
  • Figure 1 shows a cross sectional view of one embodiment of a transparent image-recording film (an image-recording transparent film) according to the present invention.
  • An image-recording transparent film 100 is a composite film comprising a light-transmitting image-receiving layer 102 placed on a surface of a light-transmitting film substrate 101.
  • the image-receiving layer containing a plasticizer has a storage elasticity (G') of generally not less than 1 x 10 1 to 1 x 10 5 , preferably of from 1 x 10 2 to 5 x IO 4 dyne/cm 2 , more preferably from 5 x IO 2 to 1 x IO 4 dyne/cm 2 at 150°C when measured by using Rheometrics "DYNAMIC ANALYZER RDA" in a measuring temperature of from 40°C to 200°C raised in the temperature step mode, in a frequency of 6 28 rad/sec in the share mode, and using "disposable cup” having a diameter of 25 mm ⁇ and a height of 5 mm as a sample holding tool.
  • G' storage elasticity
  • the image-receiving layer contains a thermoplastic resin and a plasticizer which is compatible with the thermoplastic resin.
  • the thermoplastic resin may be selected form any resin (binder) which has been hitherto used as a material for fixing or receiving the imaging material. Preferred is the resin which has excellent compatibility with a binder used for the imaging material, which easily adhere the imaging material, and which is liable to provide a transparent image.
  • thermoplastic resin is selected such that the image-receiving layer substantially consists of a polyester resin, a styrene/acrylic resin, an acrylic resin, an epoxy resin, an urethane resin, a polyolefin resin or mixtures thereof.
  • the resin same as a binder ofthe imaging material is particularly preferred.
  • the thermoplastic resin generally has a softening point of from 40 to 180°C, more preferably, from 90 to 150°C without a plasticizer.
  • the softening point is less than 40°C, the image-receiving layer is liable to wear and become difficult to handle, and when it is more than 180°C, sinking ofthe imaging material becomes insufficient, and the imaging material layer becomes uneven. Meanwhile, the softening point is less than 40°C, the image-receiving layer is liable to wear and become difficult to handle, and when it is more than 180°C, sinking ofthe imaging material becomes insufficient, and the imaging material layer becomes uneven. Meanwhile, the softening point is less than 40°C, the image-receiving layer is liable to wear and become difficult to handle, and when it is more than 180°C, sinking ofthe imaging material becomes insufficient, and the imaging material layer becomes uneven. Meanwhile, the softening point is less than 40°C, the image-receiving layer is liable to wear and become difficult to handle, and when
  • softening point used herein refers to a value measured by the ring and ball method.
  • thermoplastic resin having a weight average molecular weight of from 10,000 to 150,000. If the molecular weight is excessively small, holding power to the imaging material fixed on the image-receiving layer tends to become poor, while if it is excessively large, smoothness ofthe imaging material layer tends to become poor.
  • Preferred thermoplastic resin is a polyester resin. This is because the polyester resin has high transparency, excellent compatibility with the imaging material, and good fluidity, and thereby smoothness of a surface ofthe imaging material layer is improved.
  • Preferred polyester resin is those prepared from (i) a diol component comprising a bisphenol derivative as a principal constituent and (ii) a dicarboxylic acid component selected from a group consisting of dicarboxylic acids, and acid anhydrides and lower alkyl esters thereof.
  • These polyesters preferred to be used for the present invention are commercially available, and examples include “PS-3” available from Kao Corp., “Atlac 363E” available from Reichhold Chemicals Company, “Atlac 382E” available from Reichhold Chemicals Company, "POLYESTER HP-3201, available from Nippon Gosei Kagaku K K , and the like
  • a polyester resin is used in an amount of not less than 50% by weight based on the total weight of the thermoplastic resin which composes the image-receiving layer
  • the plasticizer contained in the image-receiving layer is compatible with the thermoplastic resin
  • the "plasticizer” ofthe present invention means a substance which reduces a coefficient of elasticity ofthe image-receiving layer without impairing its transparency, and increases lightness and saturation of an image
  • the image- receiving layer may contain two or more plasticizers
  • Polyalkylene oxide polyol may also be employed as the plasticizer in the present invention
  • the "polyalkylene oxide polyol” means generally a compound having a chain of polyalkylene oxide such as polyethylene oxide and polypropylene oxide and two or more terminal hydroxyl groups connected by the chain of polyalkylene oxide
  • a molecular weight ofthe polyalkylene oxide polyol may be varied within the range that the polyalkylene oxide polyol is sufficiently compatible with the thermoplastic resin, without impairing its transparency
  • the number average molecular weight ofthe polyalkylene oxide polyol measured by the quantitative analysis of end group is in the range of generally from about 100 to 2000, preferably from about 150 to 1000 If the molecular weight ofthe polyalkylene oxide polyol is less than 100, the polyalkylene oxide polyol may bleed out to an imaged surface, and it may soil the image If the molecular weight is more than 2000, effects of adding the plasticizer may become poor
  • preferred polyalkylene oxide polyol includes the compounds having the following formulas Formula 1
  • n represents an integer of from 2 to 100
  • n represents an integer of from 8 to 30 Formula 3 HO(CH(CH 3 )CH 2 0) n CH 2 CH(CH 3 )O(CH 2 CH(CH 3 )O) n H wherein, n represents an integer of from 1 to 20 Formula 4'
  • a compound represented by the formula 1 is generally referred to as polyethylene glycol, and includes, for example "PEG 200", “PEG 300", “PEG 400” and “PEG 600” available from Sanyo Kasei K K
  • a compound represented by the formula 2 is generally referred to as polytetramethylene glycol, and includes, for example "PTMG 6501, and "PTMG 1000” available from Sanyo Kasei K K
  • a compound represented by the formula 3 is generally referred to as polypropylene glycol, and includes, for example "PP 200", “PP 400” and “PP 1000” available from Sanyo Kasei K K
  • a compound represented by the formula 4 is generally referred to as polypropylene glycol glycerin triether, and includes, for example "GP 250", “GP 600” and "GP 1000” available from Sanyo Kasei K.K
  • plasticizer employed for the present invention is the plasticizer having at least one aromatic ring in its molecule among the above described plasticizers, such as tricresyl phosphate, diethylene glycol dibenzoate and dioctyl phthalate, and polyalkylene oxide polyol represented by the formula 1 to 4 It is preferred that the plasticizer having at least one aromatic ring in its molecule or polyalkylene oxide polyol is used in an amount of not less than 50% by weight based on the total weight ofthe plasticizer employed in the present invention
  • the plasticizer is used for the image-receiving layer generally in an amount of about 1 to 100 parts by weight, preferably 1 to 50 parts by weight, more preferably 2 to 30 parts by weight, based on 100 parts by weight ofthe thermoplastic resin When the amount ofthe plasticizer is less than about 1 part by weight, effects of addition become small, while if it is more than about 100 parts by weight, it becomes difficult to handle and the haze value becomes excessively large
  • the plasticizer sharply modify fluidity ofthe image-receiving layer (increases fluidity) when it is heated and pressed in fixing of toner
  • the plasticizer improves compatibility between a resin ofthe image-receiving layer and a binder ofthe imaging material (for example, toner) Thereby, smoothness ofthe imaging material layer after fixing is improved, lightness and saturation ofthe color image as well as color tone reproducibility ofthe projected image becomes excellent
  • the image-receiving layer have a surface resistivity of 1 x 10 s to 1 x " ⁇ /D, particularly 1 x IO 9 to 1 x ⁇ /D If the surface resistivity is less than 1 x IO 8 ⁇ /D, particles ofthe imaging material liable to fall from the image-receiving layer. If the surface resistivity is more than 1 x 10 8 ⁇ /D, traveling efficiency ofthe film becomes poor
  • an antistatic agent may be contained in the image-receiving layer
  • Preferred antistatic agent is generally chosen from a group consisting of a nonionic antistatic agent, a cationic antistatic agent, an anionic antistatic agent and a fluoride-based antistatic agents Specifically, steramidolpropyldimethyl- ⁇ -hydroxyethyl ammonium nitrate, and N,N'-bis(2-hydroxymethyl)-N-(3'-dodecyloxy-2,2'-hydroxypropyl)methyl ammonium methyl nitrate, and the like
  • the image-receiving layer may contain an suitable amount of other additives known to those skilled in the art Examples thereof include an inorganic particle and a UV absorber, and the like
  • an image-receiving layer may optionally be placed on a back surface ofthe film substrate
  • An additional layer for example, a protective layer or an adhesive layer and the like may be placed at suitable positions, such as between the film substrate and the image-receiving layer, on the image- receiving layer and the like, with the proviso, the additional layers do not adversely effect the present invention
  • the film substrate used in the present invention may be any suitable light transmitting plastic film which has conventionally been used for manufacturing an image-recording transparent film Examples thereof include polystyrene, polyamide, polyvinyl chloride, polyester, polycarbonate, and the like Particularly, polyethylene terephthalate is preferred in view of mechanical properties, workability, and the like
  • the plastic film may optionally be corona-treated or it may have a layer containing an antistatic agent, and the like, on a back surface
  • the film substrate preferably has a thickness of from 10 to 200 ⁇ m, more preferably from 50 to 175 ⁇ m If the thickness is less than 10 ⁇ m, heat resistance and mechanical strength become poor If the thickness is more than 200 ⁇ m, light transmittance (transparency) becomes poor and handling becomes complicated
  • the image-recording transparent film ofthe present invention can be prepared by various procedures known to those skilled in the art One example is, by first, a film forming composition containing the components which forms the image-receiving layer and a volatile solvent is applied on the film substrate, and dried to form the image-receiving layer Meyer bar coating, extrusion coating, dye coating, gravure coating, kiss roll coating and other general applying and laminating methods can be used.
  • the image-receiving layer is preferably placed in an amount of from 0 1 to 100 g/m 2 .
  • the resulting image-receiving layer may not thoroughly receive an imaging material, and if it is more than 100 g/m , light transmittance and traveling efficiency in an imaging equipment ofthe resulting recording film becomes poor More preferably, the image-receiving layer is placed in an amount of from 0.5 to 10 g/m 2
  • An image-recording film ofthe present invention has the image-receiving layer of which thickness is sufficiently reduced as compared to the conventional image- recording film of which image-receiving layer do not contain a plasticizer Thereby, smoothness ofthe imaging material layer and light transmittance ofthe image- recording film are improved.
  • the image- receiving layer is placed in an amount of 0 5 to 10 g/m 2 after drying, a particularly excellent image is offered.
  • the imaging material 203 is deposited on a surface 204 of the image-receiving layer ofthe image-recording transparent film 200, at the area corresponding to an image to be formed
  • a composite comprising the imaging material 203, the image-receiving layer 202, and the film substrate 201 is then heated and pressed.
  • the imaging material is thereby fixed in the vicinity of a surface 204 ofthe image-receiving layer as the imaging material layer 205, and the imaged film 206 is formed
  • the imaging material can be deposited and fixed to the image-recording transparent film by an electrophotographic recording system Specifically, an electronic duplicator such as Model "CLC350” available from Canon Corp can be used.
  • the imaging material layer 205 is not completely buried in the depth direction ofthe image-receiving layer 202 but partly buried in the image-receiving layer 202, and it slightly protrudes from the surface
  • the height of protrusion is as low as that quality of an image may not be impaired by scattering of light which is incident to the imaged film.
  • a surface ofthe imaging material layer 205 is leveled
  • a binder ofthe imaging material layer 205 is well compatible with a thermoplastic resin of an image-receiving layer 202
  • the imaged film 206 ofthe present invention provide a transparent image with high lightness and saturation as well as satisfactory tone reproducibility in the use for OHP, according to these features In order to improve tone reproducibility of an projected image in the use for
  • the imaged film ofthe present invention provides a lightness of more than 91 and a saturation of more than 27 when a yellow transparent image having an optical density of 0 26 is measured in the transmission mode with a view field of 100
  • high lightness and saturation which cannot be obtained with the conventional imaged film
  • the lightness and saturation specified herein are measured by using D65 light rays as reference light with a general calorimeter A calorimeter "COLOR ANALYZER TC-180OMKH" available from Tokyo Denshoku Co , Ltd can specifically be employed
  • a black and white image may also be formed on an image- recording transparent film ofthe present invention by using the above described electrophotographic device, and a black and white image having excellent resolution and density is provided That is, either a colored image or a black and white image may be formed on the present image-recording transparent film, according to an electrophotographic recording process, and an excellent image is provided in any case
  • Polyester resin available from Shell Chemical Co as "V1TEL 2700" 2 0 40
  • 'Polyester resin prepared by using ethylene modified and propylene modified bisphenol A, terephthalic acid and isophthaiic acid as raw materials, a molecular weight of 123,000, a softening point of 121 to 128°C 2 A softening point of 142°C, a glass transition point of 47°C
  • a solution containing polyester resin as a main component was prepared according to the composition shown in Table 1 Then, the resin solution was coated on one surface of a transparent polyethylene terephthalate film having a thickness of 125 ⁇ m, by using Meyer bar in an amount to form a dry film of 4 g/m 2 The coated solution was dried by holding for 3 minutes at 65°C and an image-receiving layer was formed The image-receiving layer had a thickness of 2 to 3 ⁇ m , a storage elasticity (G') of 7 x 10 3 dyne/cm 2 and a loss modulus (G") of 2 x IO 4 dyne/cm 2
  • Comparative Example 1 An imaged film was prepared and evaluated according to substantially the same manner as described in example 1, except for omitting tricresyl phosphate
  • the resulting image-receiving layer had a storage elasticity (G) of 2 x IO 4 dyne/cm 2 and a loss modulus (G") of 5 x IO 4 dyne/cm 2
  • G storage elasticity
  • G loss modulus
  • Polyester resin available from Reichhold Chemicals Co as "Atlac 382E” 1 20.00 Polyester resin (available from Shell Chemical Co as "VITEL 2700”) 2 0 40
  • 'Polyester resin prepared by using propylene modified bisphenol A and fuma ⁇ c acid as raw materials, a molecular weight of 14,470, a softening point of 94 to 108°C 2 A softening point of 142°C, a glass transition point of 47°C
  • Polyester resin (available from Reichhold Chemicals Co. as "Atlac 363E") 1 20 00
  • Polyester resin available from Shell Chemical Co as "VITEL 2700" 2 0 40
  • 'Polyester resin prepared by using propylene modified bisphenol A and fumaric acid as raw materials; a molecular weight of 66,300, a softening point of 108 to 124°C
  • Comparative Example 3 An imaged film was prepared and evaluated according to substantially the same manner as described in example 3, except for omitting tricresyl phosphate Table 6 shows the results.
  • Polyester resin (available from Kao Corp as "PS-3") 1 20 00
  • Polyester resin available from Shell Chemical Co as "VITEL 2700" 2 0 40
  • Methylethyl ketone 37 69 Polyester resin prepared by using ethylene modified and propylene modified bisphenol A, terephthalic acid and isophthaiic acid as raw matenals, a molecular weight of 123.000, a softening point of 121 to 128°C
  • Polyester resin available from Kao Corp as “PS-3 ” J 20 00 Polyester resin (available from Shell Chemical Co as “VITEL 2700”) 2 0 40
  • 'Polyester resin prepared by using ethylene modified and propylene modified bisphenol A , terephthalic acid and isophthaiic acid as raw materials, a molecular weight of 123,000, a softening point of 121 to 128°C 2 A softening point of 142°C; a glass transition point of 47°C 3 A molecular weight of 1000
  • An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 1, except for using the composition shown in Table 9
  • the image-receiving layer had a storage elasticity (G) of 5 x 10 3 dyne/cm 2 and a loss modulus (G") of 2 x IO 4 dyne/cm 2 .
  • the resulting imaged film was evaluated according to substantialh the same manner as described in example 1 Table 10 shows the results
  • Comparative Example 4 An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 5, except for omitting polytetramethylene ether glycol
  • the image-receiving layer had a storage elasticity (G) of 2 x I O 4 dyne/cm 2 and a loss modulus (G") of 5 x IO 4 dyne/cm 2
  • G storage elasticity
  • G loss modulus
  • Polyester resin available from Kao Corp. as "PS-3" 1 20.00 Polyester resin (available from Shell Chemical Co as “VITEL 2700”) 2 0.40 Antistatic agent (available from American Cyanamid Co as “Cyastat 609”) 0 40 Silica particles (available from Fuji Silicia Chemical K K “Sailicia 470”) 0.03 Polytetramethylene ether glycol (available from Sanyo Kasei K K as
  • 'Polyester resm prepared by using ethylene modified and propylene modified bisphenol A, terephthalic acid and isophthaiic acid as raw materials, a molecular weight of 123,000, a softening point of 121 to 128°C 2 A softening point of 142°C; a glass transition point of 47°C 3 A molecular weight of 650
  • An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 1, except for using the composition shown in Table 1 1
  • the image-receiving layer had a storage elasticity (G) of 3 x 10 3 dyne/cm 2 and a loss modulus (G") of 1 x IO 4 dyne/cm 2
  • G storage elasticity
  • G loss modulus
  • Polyester resin (available from Kao Corp as "PS-3") 1 20 00
  • Polyester resin available from Shell Chemical Co as "VITEL 2700" 2 0 40
  • 'Polyester resin prepared by using ethylene modified and propylene modified bisphenol A, terephthalic acid and isophthaiic acid as raw materials, a molecular weight of 123,000; a softening point of 121 to 128°C
  • An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 1, except for using the composition shown in Table 12
  • the image-receiving layer had a storage elasticity (G) of 2 x 10 3 dyne/cm 2 and a loss modulus (G") of 8 x 10 3 dyne/cm 2
  • G storage elasticity
  • G loss modulus
  • Polyester resin available from Kao Corp as "PS-3" 1 20 00 Polyester resin (available from Shell Chemical Co as “VITEL 2700”) 2 0 40
  • Polyalkylene glycol (available from Sanyo Kasei K K as "GP 250") 3 4 00
  • 'Polyester resin prepared by using ethylene modified and propylene modified bisphenol A, terephthalic acid and isophthaiic acid as raw materials, a molecular weight of 123,000, a softening point of 121 to 128°C 2 A softening point of 142°C; a glass transition point of 47°C 3 A molecular weight of 250
  • An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 1, except for using the composition shown in Table 13
  • the image-receiving layer had a storage elasticity (G) of 5 x 10 3 dyne/cm 2 and a loss modulus (G") of 2 x IO 4 dyne/cm 2
  • G storage elasticity
  • G loss modulus
  • Polyester resin available from Reichhold Chemicals Co as "Atlac 363E” 1 20 00 Polyester resin (available from Shell Chemical Co as "VITEL 2700”) 2 0 40
  • Polyethylene glycol (available from Sanyo Kasei K K as "PEG 200") 3 4 00
  • 'Polyester resin prepared by using propylene modified bisphenol A and fuma ⁇ c acid as raw matenals, a molecular weight of 66,300, a softening point of 108 to 124°C 2 A softening point of 142°C, a glass transition point of 47°C 3 A number average molecular weight of 200
  • An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 1, except for using the composition shown in Table 15
  • the image-receiving layer had a storage elasticity (G) of 3 x IO 2 dyne/cm 2 and a loss modulus (G") of 3 x 10 3 dyne/cm 2
  • G storage elasticity
  • G loss modulus
  • Comparative Example 5 An image-receiving layer was formed on one surface of the polyethylene terephthalate film according to substantially the same manner as described in example 9, except for omitting polyethylene glycol
  • the image-receiving layer had a storage elasticity (G) of 2 x IO 3 dyne/cm 2 and a loss modulus (G") of 2 x IO 4 dyne/cm 2
  • G storage elasticity
  • G loss modulus
  • Polyester resin (available from Reichhold Chemicals Co as Atlac 382E") 1 20 00
  • Polyester resin available from Shell Chemical Co as "VITEL 2700" 2 0 40
  • Polyalkylene glycol available from Sanyo Kasei K K as "GP 25011) 3 4 00
  • Polyester resin prepared by using propylene modified bisphenol A and fumanc acid as raw matenals, a molecular weight of 14,470, a softening point of 94 to 108°C 2 A softening point of 142°C, a glass transition point of 47°C 3 A number average molecular weight of 250
  • An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film accordmg to substantially the same manner as described in example 1, except for using the composition shown in Table 17
  • the image-receiving layer had a storage elasticity (G) of 2 x 10 5 dyne/cm 2 and a loss modulus (G") of 8 x IO 2 dyne/cm 2
  • the resulting imaged film was evaluated according to substantially the same manner as described in example 1
  • Table 18 shows the results Comparative Fxample 6
  • An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 10, except for omitting polyalkylene glycol
  • the image-receiving layer had a storage elasticity (G) of 1 x IO 2 dyne/cm 2 and a loss modulus (G") of ⁇ 10 3 dyne/cm 2
  • the resulting imaged film was
  • An image-recording transparent film which can record a transparent image by the use of an electrophotographic recording system, wherein the transparent image has high lightness and saturation and offers good color tone reproducibility in the use for OHP is provided
  • FIG. 1 A cross-sectional view which illustrates one embodiment ofthe present image-recording transparent film
  • FIG. 1 A cross-sectional view which illustrates one aspect of using the present image-recording transparent film Explanation of Numbering:

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Abstract

An image-recording transparent film comprising a light-transmitting film substrate and a light-transmitting image-receiving layer placed on at least one major surface of the film substrate, wherein said image-receiving layer contains (a) a thermoplastic resin selected from the group consisting of a polyester resin, a styrene/acrylic resin, an acrylic resin, an epoxy resin, a urethane resin and a polyolefin resin, and (b) a plasticizer which is compatible with the thermoplastic resin.

Description

IMAGE-RECORDING TRANSPARENT FILM AND IMAGED FILM
Background ofthe Invention Description ofthe Technology The present invention relates to an image-recording transparent film which can be imaged by an electrophotographic method, and more particularly to a transparent color image-recording transparent film for use in an overhead projector (OHP).
Related Art The recent progress in full-color electrophotographic technology has improved images greatly, but when a color image is formed on a film by an electrophotographic method, smoothness of a toner layer after fixing tends to be somewhat unsatisfactory. When such a color image is used as an image for OHP projection, incident light scatters and a projected image on a screen becomes dark, and original color ofthe image is not completely reproduced
Japanese Kokai Publication No Sho 63-80273 discloses methods for improving smoothness ofthe toner layer after fixing, such as a method of fixing at high temperatures at which toner thoroughly melts, a method of fixing by using solvents such as toluene and the like, a method of polishing an imaged surface after fixing, and a method of applying a transparent coating composition which does not dissolve toner onto a fixed toner layer However, at the high temperatures at which the toner thoroughly melts offset occurs in the area of high density in a contact fixing method using a roller, or an image-recording transparent film waves in a non-contact heating fixing method using an oven and it takes time for fixing In the fixing method using solvents, flow or loss of image occurs in the area of high density. In the method of polishing an imaged surface after fixing, it is impossible to thoroughly increase smoothness ofthe toner layer at the area of low density In the method of applying a transparent coating which does not dissolve toner onto a fixed toner layer, a definite boundary may be formed between toner particles and a toner image, the boundary scatters light, and reproducibility of colors becomes poor
Japanese Kokoku Publication No Hei 6-14232 proposes a method for improving compatibility between a binder and a colorant such as dyes and pigments which constitute toner, by contacting a plasticizer with a fixed toner layer. However, even if the compatibility between the binder and the colorant is improved, smoothness of a surface ofthe toner layer does not increase
Japanese Kokai Publication No. Hei 2-263642 (corresponding to US Patent Nos. 5,009,945, 5,229, 188 and 5,352,553) discloses a transparent image-recording film having an image-receiving layer on its surface containing a resin which has elasticity higher than that of a binder of toner and is compatible with the binder.
However, at the toner fixing temperature, toner does not sink sufficientK in the image-receiving layer, because the image-receiving layer is harder than the toner, and a surface ofthe toner layer becomes uneven
In this transparent film, the solubility parameter ofthe image-receiving layer is controlled (no plasticizer is added) in order to make the image-receiving layer and the toner compatible. According to the procedure, however, an image-receiving layer have to be prepared corresponding to a kind ofthe toner binder used individually, and the procedure lacks versatility.
Japanese Kokai Publication No. Hei 4-212168 (corresponding to US Patent No. 5,208,21 1) discloses a transparent image-recording film having an image-receiving layer thereon of which fluidizing temperature is lower than that of toner.
However, the transparent film does not produce a smooth surface of a toner layer when the toner has larger particle size than thickness ofthe image-receiving layer or when the toner coheres.
The present invention is made in order to solve the conventional problems, and an object ofthe present invention is to provide an image-recording transparent film which can record a transparent image by the use of an electrophotographic recording system, wherein the transparent image has high lightness and saturation and offers good color tone reproducibility in the use for OHP.
Description ofthe Invention The present invention provides an image-recording transparent film comprising a light-transmitting film substrate and a light-transmitting image-receiving layer placed on at least one major surface ofthe film substrate, wherein said image-receiving layer contains (a) a thermoplastic resin selected from the group consisting of a polyester resin, a styrene/acrylic resin, an acrylic resin, an epoxy resin, an urethane resin and a polyolefin resin, and (b) a plasticizer which is compatible with the thermoplastic resin, thereby the object ofthe present invention is achieved The present invention also provides an imaged film comprising the above described image-recording transparent film and an imaging material layer which is imagewise placed on a surface ofthe image-receiving layer thereof.
Throughout the specification, "imaging material" means a resin composition comprising colorant such as dyes and pigments and a thermoplastic resin The imaging material generally has a melting point of from 60 to 150°C and a mean particle ze of from 3 to 50 μm, and examples include thermal transfer ink and toner for electronic copying The imaging material is fixed to the image-recording transparent film by a fixing method such as a thermocompressing roller according to a desired pattern to form an imaging material layer on a surface ofthe image-receiving layer. Figure 1 shows a cross sectional view of one embodiment of a transparent image-recording film (an image-recording transparent film) according to the present invention. An image-recording transparent film 100 is a composite film comprising a light-transmitting image-receiving layer 102 placed on a surface of a light-transmitting film substrate 101. The image-receiving layer containing a plasticizer has a storage elasticity (G') of generally not less than 1 x 101 to 1 x 105 , preferably of from 1 x 102to 5 x IO4 dyne/cm2, more preferably from 5 x IO2 to 1 x IO4 dyne/cm2 at 150°C when measured by using Rheometrics "DYNAMIC ANALYZER RDA" in a measuring temperature of from 40°C to 200°C raised in the temperature step mode, in a frequency of 6 28 rad/sec in the share mode, and using "disposable cup" having a diameter of 25 mm ø and a height of 5 mm as a sample holding tool.
When the storage elasticity is less than 1 x 101 dyne/cm2, offset is liable to occur in fixing, and leveling ofthe imaging material layer after fixation becomes difficult, while if it is more than 1 x 10s dyne/cm2, the imaging material becomes difficult to sink in the image-receiving layer, and a surface ofthe imaging material layer becomes uneven. The image-receiving layer contains a thermoplastic resin and a plasticizer which is compatible with the thermoplastic resin. The thermoplastic resin may be selected form any resin (binder) which has been hitherto used as a material for fixing or receiving the imaging material. Preferred is the resin which has excellent compatibility with a binder used for the imaging material, which easily adhere the imaging material, and which is liable to provide a transparent image.
Thus, the thermoplastic resin is selected such that the image-receiving layer substantially consists of a polyester resin, a styrene/acrylic resin, an acrylic resin, an epoxy resin, an urethane resin, a polyolefin resin or mixtures thereof. The resin same as a binder ofthe imaging material is particularly preferred.
The thermoplastic resin generally has a softening point of from 40 to 180°C, more preferably, from 90 to 150°C without a plasticizer. When the softening point is less than 40°C, the image-receiving layer is liable to wear and become difficult to handle, and when it is more than 180°C, sinking ofthe imaging material becomes insufficient, and the imaging material layer becomes uneven. Meanwhile, the
"softening point" used herein refers to a value measured by the ring and ball method.
Typically, it is possible to use a thermoplastic resin having a weight average molecular weight of from 10,000 to 150,000. If the molecular weight is excessively small, holding power to the imaging material fixed on the image-receiving layer tends to become poor, while if it is excessively large, smoothness ofthe imaging material layer tends to become poor.
Preferred thermoplastic resin is a polyester resin. This is because the polyester resin has high transparency, excellent compatibility with the imaging material, and good fluidity, and thereby smoothness of a surface ofthe imaging material layer is improved.
Preferred polyester resin is those prepared from (i) a diol component comprising a bisphenol derivative as a principal constituent and (ii) a dicarboxylic acid component selected from a group consisting of dicarboxylic acids, and acid anhydrides and lower alkyl esters thereof. These polyesters preferred to be used for the present invention are commercially available, and examples include "PS-3" available from Kao Corp., "Atlac 363E" available from Reichhold Chemicals Company, "Atlac 382E" available from Reichhold Chemicals Company, "POLYESTER HP-3201, available from Nippon Gosei Kagaku K K , and the like
It is preferred that a polyester resin is used in an amount of not less than 50% by weight based on the total weight of the thermoplastic resin which composes the image-receiving layer
The plasticizer contained in the image-receiving layer is compatible with the thermoplastic resin The "plasticizer" ofthe present invention means a substance which reduces a coefficient of elasticity ofthe image-receiving layer without impairing its transparency, and increases lightness and saturation of an image The image- receiving layer may contain two or more plasticizers
Examples ofthe plasticizer which may be employed for the present invention include phthalates such as dimethyl phthalate, diethyl phthalate, isobutyl phthalate, dibutyl phthalate, heptyl phthalate, di-2-ethylhexyl phthalate, diisooctyl phthalate, di-n- octyl phthalate, dinonyl phthalate, isodecyl phthalate, tridecyl phthalate and dicyclohexyl phthalate, fatty acid dibasic acid esters such as diisodecyl succinate, dioctyl adipate, diisodecyl adipate, dioctyl azelate, dibutyl sebacate, dioctyl sebacate and dioctyl tetrahydrophthalate, glycol esters such as dipentaerythritol hexaester and pentaerythritol ester, phosphates such as trioctyl phosphate, octyl diphenyl phosphate, triphenyl phosphate, trichloroethyl phosphate and cresyl diphenyl phosphate, and epoxy plasticizers such as butyl epoxystearate, octyl epoxydistearate, benzyl epoxystearate and dioctyl epoxyhexahydrophthalate
Polyalkylene oxide polyol may also be employed as the plasticizer in the present invention The "polyalkylene oxide polyol" means generally a compound having a chain of polyalkylene oxide such as polyethylene oxide and polypropylene oxide and two or more terminal hydroxyl groups connected by the chain of polyalkylene oxide
A molecular weight ofthe polyalkylene oxide polyol may be varied within the range that the polyalkylene oxide polyol is sufficiently compatible with the thermoplastic resin, without impairing its transparency The number average molecular weight ofthe polyalkylene oxide polyol measured by the quantitative analysis of end group is in the range of generally from about 100 to 2000, preferably from about 150 to 1000 If the molecular weight ofthe polyalkylene oxide polyol is less than 100, the polyalkylene oxide polyol may bleed out to an imaged surface, and it may soil the image If the molecular weight is more than 2000, effects of adding the plasticizer may become poor
As the plasticizer ofthe present invention, preferred polyalkylene oxide polyol includes the compounds having the following formulas Formula 1
HO(CH2CH20)nH wherein, n represents an integer of from 2 to 100
Formula 2
HO(CH2CH2CH2CH20)nH wherein, n represents an integer of from 8 to 30 Formula 3 HO(CH(CH3)CH20)nCH2CH(CH3)O(CH2CH(CH3)O)nH wherein, n represents an integer of from 1 to 20 Formula 4'
CH20(CH2CH(CH3)O)nH
I CHO(CH2CH(CH3)O)„H
I
CH2O(CH2CH(CH3)O)nH wherein, n represents an integer of from 1 to 20 A compound represented by the formula 1 is generally referred to as polyethylene glycol, and includes, for example "PEG 200", "PEG 300", "PEG 400" and "PEG 600" available from Sanyo Kasei K K A compound represented by the formula 2 is generally referred to as polytetramethylene glycol, and includes, for example "PTMG 6501, and "PTMG 1000" available from Sanyo Kasei K K A compound represented by the formula 3 is generally referred to as polypropylene glycol, and includes, for example "PP 200", "PP 400" and "PP 1000" available from Sanyo Kasei K K A compound represented by the formula 4 is generally referred to as polypropylene glycol glycerin triether, and includes, for example "GP 250", "GP 600" and "GP 1000" available from Sanyo Kasei K.K
Particularly preferred plasticizer employed for the present invention is the plasticizer having at least one aromatic ring in its molecule among the above described plasticizers, such as tricresyl phosphate, diethylene glycol dibenzoate and dioctyl phthalate, and polyalkylene oxide polyol represented by the formula 1 to 4 It is preferred that the plasticizer having at least one aromatic ring in its molecule or polyalkylene oxide polyol is used in an amount of not less than 50% by weight based on the total weight ofthe plasticizer employed in the present invention The plasticizer is used for the image-receiving layer generally in an amount of about 1 to 100 parts by weight, preferably 1 to 50 parts by weight, more preferably 2 to 30 parts by weight, based on 100 parts by weight ofthe thermoplastic resin When the amount ofthe plasticizer is less than about 1 part by weight, effects of addition become small, while if it is more than about 100 parts by weight, it becomes difficult to handle and the haze value becomes excessively large
Although it is not clear in detail, the plasticizer sharply modify fluidity ofthe image-receiving layer (increases fluidity) when it is heated and pressed in fixing of toner The plasticizer improves compatibility between a resin ofthe image-receiving layer and a binder ofthe imaging material (for example, toner) Thereby, smoothness ofthe imaging material layer after fixing is improved, lightness and saturation ofthe color image as well as color tone reproducibility ofthe projected image becomes excellent
It is preferred that the image-receiving layer have a surface resistivity of 1 x 10s to 1 x " Ω/D, particularly 1 x IO9 to 1 x Ω/D If the surface resistivity is less than 1 x IO8 Ω/D, particles ofthe imaging material liable to fall from the image-receiving layer. If the surface resistivity is more than 1 x 108 Ω/D, traveling efficiency ofthe film becomes poor
In order to control surface resistivity of the image-receiving layer, an antistatic agent may be contained in the image-receiving layer Preferred antistatic agent is generally chosen from a group consisting of a nonionic antistatic agent, a cationic antistatic agent, an anionic antistatic agent and a fluoride-based antistatic agents Specifically, steramidolpropyldimethyl-β-hydroxyethyl ammonium nitrate, and N,N'-bis(2-hydroxymethyl)-N-(3'-dodecyloxy-2,2'-hydroxypropyl)methyl ammonium methyl nitrate, and the like
The image-receiving layer may contain an suitable amount of other additives known to those skilled in the art Examples thereof include an inorganic particle and a UV absorber, and the like
Though not illustrated herein, an image-receiving layer may optionally be placed on a back surface ofthe film substrate An additional layer, for example, a protective layer or an adhesive layer and the like may be placed at suitable positions, such as between the film substrate and the image-receiving layer, on the image- receiving layer and the like, with the proviso, the additional layers do not adversely effect the present invention
The film substrate used in the present invention may be any suitable light transmitting plastic film which has conventionally been used for manufacturing an image-recording transparent film Examples thereof include polystyrene, polyamide, polyvinyl chloride, polyester, polycarbonate, and the like Particularly, polyethylene terephthalate is preferred in view of mechanical properties, workability, and the like The plastic film may optionally be corona-treated or it may have a layer containing an antistatic agent, and the like, on a back surface The film substrate preferably has a thickness of from 10 to 200 μm, more preferably from 50 to 175 μm If the thickness is less than 10 μm, heat resistance and mechanical strength become poor If the thickness is more than 200 μm, light transmittance (transparency) becomes poor and handling becomes complicated
The image-recording transparent film ofthe present invention can be prepared by various procedures known to those skilled in the art One example is, by first, a film forming composition containing the components which forms the image-receiving layer and a volatile solvent is applied on the film substrate, and dried to form the image-receiving layer Meyer bar coating, extrusion coating, dye coating, gravure coating, kiss roll coating and other general applying and laminating methods can be used The image-receiving layer is preferably placed in an amount of from 0 1 to 100 g/m2. If the amount is less than 0 1 g/m2, the resulting image-receiving layer may not thoroughly receive an imaging material, and if it is more than 100 g/m , light transmittance and traveling efficiency in an imaging equipment ofthe resulting recording film becomes poor More preferably, the image-receiving layer is placed in an amount of from 0.5 to 10 g/m2
An image-recording film ofthe present invention has the image-receiving layer of which thickness is sufficiently reduced as compared to the conventional image- recording film of which image-receiving layer do not contain a plasticizer Thereby, smoothness ofthe imaging material layer and light transmittance ofthe image- recording film are improved. In the preferred embodiment in which the image- receiving layer is placed in an amount of 0 5 to 10 g/m2 after drying, a particularly excellent image is offered.
When the image-recording transparent film ofthe present invention is used, by first, as shown in Figure 2a, the imaging material 203 is deposited on a surface 204 of the image-receiving layer ofthe image-recording transparent film 200, at the area corresponding to an image to be formed A composite comprising the imaging material 203, the image-receiving layer 202, and the film substrate 201 is then heated and pressed. As shown in Figure 2b, the imaging material is thereby fixed in the vicinity of a surface 204 ofthe image-receiving layer as the imaging material layer 205, and the imaged film 206 is formed
The imaging material can be deposited and fixed to the image-recording transparent film by an electrophotographic recording system Specifically, an electronic duplicator such as Model "CLC350" available from Canon Corp can be used.
The imaging material layer 205 is not completely buried in the depth direction ofthe image-receiving layer 202 but partly buried in the image-receiving layer 202, and it slightly protrudes from the surface The height of protrusion is as low as that quality of an image may not be impaired by scattering of light which is incident to the imaged film. A surface ofthe imaging material layer 205 is leveled In addition, at the interface between the imaging material layer 205 and the image-receiving layer 202, a binder ofthe imaging material layer 205 is well compatible with a thermoplastic resin of an image-receiving layer 202 It is believed that the imaged film 206 ofthe present invention provide a transparent image with high lightness and saturation as well as satisfactory tone reproducibility in the use for OHP, according to these features In order to improve tone reproducibility of an projected image in the use for
OHP, lightness and saturation of an transparent image of the imaged film have to be improved The imaged film ofthe present invention provides a lightness of more than 91 and a saturation of more than 27 when a yellow transparent image having an optical density of 0 26 is measured in the transmission mode with a view field of 100 According to the present invention, high lightness and saturation which cannot be obtained with the conventional imaged film is provided The lightness and saturation specified herein are measured by using D65 light rays as reference light with a general calorimeter A calorimeter "COLOR ANALYZER TC-180OMKH" available from Tokyo Denshoku Co , Ltd can specifically be employed Meanwhile, a black and white image may also be formed on an image- recording transparent film ofthe present invention by using the above described electrophotographic device, and a black and white image having excellent resolution and density is provided That is, either a colored image or a black and white image may be formed on the present image-recording transparent film, according to an electrophotographic recording process, and an excellent image is provided in any case
Examples
Example 1
Table 1
Composition Parts by Weight Polyester resin (available from Kao Corp as "PS-3")1 20 00
Polyester resin (available from Shell Chemical Co as "V1TEL 2700")2 0 40
Antistatic agent (available from American Cyanamid Co as "Cyastat 609") 0 50
Silica particles (available from Fuji Silica Chemical K K "Silica 470") 0 03
Tricresyl phosphate 4 00 Toluene 37.54
Methylethyl ketone 37 54
'Polyester resin prepared by using ethylene modified and propylene modified bisphenol A, terephthalic acid and isophthaiic acid as raw materials, a molecular weight of 123,000, a softening point of 121 to 128°C 2A softening point of 142°C, a glass transition point of 47°C
A solution containing polyester resin as a main component was prepared according to the composition shown in Table 1 Then, the resin solution was coated on one surface of a transparent polyethylene terephthalate film having a thickness of 125 μm, by using Meyer bar in an amount to form a dry film of 4 g/m2 The coated solution was dried by holding for 3 minutes at 65°C and an image-receiving layer was formed The image-receiving layer had a thickness of 2 to 3 μm , a storage elasticity (G') of 7 x 103 dyne/cm2 and a loss modulus (G") of 2 x IO4 dyne/cm2
On a surface ofthe image-receiving layer ofthe image-recording transparent film obtained, a color image was formed by using the electrophotographic system imaging equipment (available from Canon Corp as "CLC350") Lightness (L*) and saturation (C*) ofthe color image ofthe imaged film obtained were measured in the transmission mode of 10° view field by using a color analyzer "TC-1800MKH" available from Tokyo Denshoku Company Table 2 shows the results
Comparative Example 1 An imaged film was prepared and evaluated according to substantially the same manner as described in example 1, except for omitting tricresyl phosphate The resulting image-receiving layer had a storage elasticity (G) of 2 x IO4 dyne/cm2 and a loss modulus (G") of 5 x IO4 dyne/cm2 Table 2 shows the results
Table 2
Example 1 Example 2
Color O.D 1 L* C* L* C* Yellow 0 26 92 93 32 05 86 72 29 35
Magenta 0 17 86 71 14 87 83 09 14 00
Cyan 0 27 85 81 19 75 79 47 18 99
'Transparent value
The results of table 2 show that a color image having excellent lightness (L*) and saturation (C*) is obtained by including the plasticizer to the image-receiving layer
Example 2 Table 3 Composition _Paι ii bv Weight
Polyester resin (available from Reichhold Chemicals Co as "Atlac 382E")1 20.00 Polyester resin (available from Shell Chemical Co as "VITEL 2700")2 0 40
Antistatic agent (available from American Cyanamid Co as "Cyastat 609") 0.20
Silica particles (available from Fuji Silica Chemical K K "Silica 470") 0 03
Tricresyl phosphate 4 00
Toluene 37 69
Methylethyl ketone 37 69
'Polyester resin prepared by using propylene modified bisphenol A and fumaπc acid as raw materials, a molecular weight of 14,470, a softening point of 94 to 108°C 2 A softening point of 142°C, a glass transition point of 47°C
An imaged film was prepared and evaluated according to substantially the same manner as described in example 1, except for using the composition shown in Table 3 Table 4 shows the results Comparative Example 2 An imaged film was prepared and evaluated according to substantially the same manner as described in example 2, except for omitting tricresyl phosphate Table 4 shows the results
Table 4
Example 2 C Example 2
Color O D 1 L* C* L* C*
Yellow 0.22 92 14 27 29 89 76 25 46
Magenta 0.17 85 86 14 25 85 16 11 47
Cyan 0.27 85 32 20 16 83 98 17 18
'Transparent value
The results of table 4 show that a color image having excellent lightness (L*) and saturation (C*) is obtained by including the plasticizer to the image-receiving layer
Example 3 Table 5
Composition Parts by Weight
Polyester resin (available from Reichhold Chemicals Co. as "Atlac 363E")1 20 00
Polyester resin (available from Shell Chemical Co as "VITEL 2700")2 0 40
Antistatic agent (available from American Cyanamid Co as "Cyastat 609") 0.50
Silica particles (available from Fuji Silica Chemical K K "Silica 470") 0.03
Diethylene glycol dibenzoate (available from Sanyo Kasei K K as "EB 200") 4 00
Toluene 37 54
Methylethyl ketone 37 54
'Polyester resin prepared by using propylene modified bisphenol A and fumaric acid as raw materials; a molecular weight of 66,300, a softening point of 108 to 124°C
2A softening point of 142°C; a glass transition point of 47°C An imaged film was prepared and evaluated according to substantially the same manner as described in example 1, except for using the composition shown in Table 5 Table 6 shows the results
Comparative Example 3 An imaged film was prepared and evaluated according to substantially the same manner as described in example 3, except for omitting tricresyl phosphate Table 6 shows the results.
Table 6
Example 3 C Example 3
Color O.D 1 L* C* L* C*
Yellow 0 23 92 88 27 54 90 40 26.30
Magenta 0.17 86 45 15 96 85 39 12 80
Cyan 0.25 85 96 19 88 83 76 17 21 |
'Transparent value The results of table 6 show that a color image having excellent lightness (L*) and saturation (C*) is obtained by including the plasticizer to the image- receiving layer.
Example 4 Table 7 Composition Parts by Weight
Polyester resin (available from Kao Corp as "PS-3")1 20 00
Polyester resin (available from Shell Chemical Co as "VITEL 2700")2 0 40
Antistatic agent (available from American Cyanamid Co as "Cyastat 609") 0 2ϋ
Silica particles (available from Fuji Silicia Chemical K K "Sailicia 470") 0 03
Dioctyl phthalate 4 00
Toluene 37 69
Methylethyl ketone 37 69 'Polyester resin prepared by using ethylene modified and propylene modified bisphenol A, terephthalic acid and isophthaiic acid as raw matenals, a molecular weight of 123.000, a softening point of 121 to 128°C
2A softening point of 142°C, a glass transition point of 47°C
An imaged film was prepared and evaluated according to substantially the same manner as described in example 1, except for using the composition shown in Table 7
Table 8 shows the results
Table 8
Figure imgf000017_0001
'Transparent value
Example 5 Table 9
Composition Parts by Weight
Polyester resin (available from Kao Corp as "PS-3 ")J 20 00 Polyester resin (available from Shell Chemical Co as "VITEL 2700")2 0 40
Antistatic agent (available from American Cyanamid Co as "Cyastat 609") 0 40 Silica particles (available from Fuji Silicia Chemical K K "Sailicia 470") 0 03
Polytetramethylene ether glycol (available from Mitsubisi Kasei K K as
"PTMG 1000")3 4 00 Toluene 37 59
Methylethyl ketone 37 59
'Polyester resin prepared by using ethylene modified and propylene modified bisphenol A , terephthalic acid and isophthaiic acid as raw materials, a molecular weight of 123,000, a softening point of 121 to 128°C 2A softening point of 142°C; a glass transition point of 47°C 3 A molecular weight of 1000
An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 1, except for using the composition shown in Table 9 The image-receiving layer had a storage elasticity (G) of 5 x 103 dyne/cm2 and a loss modulus (G") of 2 x IO4 dyne/cm2. The resulting imaged film was evaluated according to substantialh the same manner as described in example 1 Table 10 shows the results
Comparative Example 4 An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 5, except for omitting polytetramethylene ether glycol The image-receiving layer had a storage elasticity (G) of 2 x I O4 dyne/cm2 and a loss modulus (G") of 5 x IO4 dyne/cm2 The resulting imaged film was evaluated according to substantially the same manner as described in example 5 Table 10 shows the results Table 10
Example 5 C. Example 4
Color O.D.1 L* C* L* C*
Yellow 0 19 92 47 22 51 86 36 21 67
Magenta 0.13 88 16 1 1.21 84 67 7.81
Cyan 0.20 86.69 14.64 80.95 13.64
Transparent value
The results of table 10 show that a color image having excellent lightness (L*) and saturation (C*) is obtained by including polyalkylene oxide polyol to the image- receiving layer as the plasticizer
Example 6 Table 1 1
Composition Parts by Weight
Polyester resin (available from Kao Corp. as "PS-3")1 20.00 Polyester resin (available from Shell Chemical Co as "VITEL 2700")2 0.40 Antistatic agent (available from American Cyanamid Co as "Cyastat 609") 0 40 Silica particles (available from Fuji Silicia Chemical K K "Sailicia 470") 0.03 Polytetramethylene ether glycol (available from Sanyo Kasei K K as
"PTMG 650")3 4.00 Toluene 37.59 methylethyl ketone 37.59
'Polyester resm prepared by using ethylene modified and propylene modified bisphenol A, terephthalic acid and isophthaiic acid as raw materials, a molecular weight of 123,000, a softening point of 121 to 128°C 2A softening point of 142°C; a glass transition point of 47°C 3A molecular weight of 650
An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 1, except for using the composition shown in Table 1 1 The image-receiving layer had a storage elasticity (G) of 3 x 103 dyne/cm2 and a loss modulus (G") of 1 x IO4 dyne/cm2 The resulting imaged film was evaluated according to substantially the same manner as described in example 1 Table 14 shows the results
Example 7 Table 12 Composition Parts by Weight
Polyester resin (available from Kao Corp as "PS-3")1 20 00
Polyester resin (available from Shell Chemical Co as "VITEL 2700")2 0 40
Antistatic agent (available from American Cyanamid Co as "Cyastat 609") 0 40
Silica particles (available from Fuji Silicia Chemical K K "Sailicia 470") 0.03 Polypropylene glycol (available from Sanyo Kasei K K as "PP 400")3 4 00
Toluene 37 59
Methylethyl ketone 37.59
'Polyester resin prepared by using ethylene modified and propylene modified bisphenol A, terephthalic acid and isophthaiic acid as raw materials, a molecular weight of 123,000; a softening point of 121 to 128°C
2A softening point of 142°C; a glass transition point of 47°C 3A molecular weight of 400
An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 1, except for using the composition shown in Table 12 The image-receiving layer had a storage elasticity (G) of 2 x 103 dyne/cm2 and a loss modulus (G") of 8 x 103 dyne/cm2 The resulting imaged film was evaluated according to substantially the same manner as described in example 1 Table 14 shows the results
Example 8 Table 13
Composition Parts by Weight
Polyester resin (available from Kao Corp as "PS-3")1 20 00 Polyester resin (available from Shell Chemical Co as "VITEL 2700")2 0 40
Antistatic agent (available from American Cyanamid Co as "Cyastat 609") 0 40
Silica particles (available from Fuji Silicia Chemical K K "Sailicia 470") 0 03
Polyalkylene glycol (available from Sanyo Kasei K K as "GP 250")3 4 00
Toluene 37.59 Methylethyl ketone 37.59
'Polyester resin prepared by using ethylene modified and propylene modified bisphenol A, terephthalic acid and isophthaiic acid as raw materials, a molecular weight of 123,000, a softening point of 121 to 128°C 2A softening point of 142°C; a glass transition point of 47°C 3A molecular weight of 250
An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 1, except for using the composition shown in Table 13 The image-receiving layer had a storage elasticity (G) of 5 x 103 dyne/cm2 and a loss modulus (G") of 2 x IO4 dyne/cm2 The resulting imaged film was evaluated according to substantially the same manner as described in example 1 Table 14 shows the results
Table 14
Example 6 Example 7 Example 8 |
Color O D 1 L* C* L* C* L* C*
Yellow 0 19 93 01 22 43 93 49 22 51 93 45 23 21
Magenta 0 13 88 23 11 20 87 35 13 47 87 58 13 03
Cyan 0.20 87 30 15 61 87 25 15 79 87 76 15 40 |
'Transparent value The results of table 14 show that a color image having excellent lightness (L*) and saturation (C*) is obtained by including polyalkylene oxide polyol to the unage- receiving layer as the plasticizer
Example 9 Table 15
Composition Parts by Weight
Polyester resin (available from Reichhold Chemicals Co as "Atlac 363E")1 20 00 Polyester resin (available from Shell Chemical Co as "VITEL 2700")2 0 40
Antistatic agent (available from American Cyanamid Co as "Cyastat 609") 0 20 Silica particles (available from Fuji Silicia Chemical K K "Sailicia 470") 0 03
Polyethylene glycol (available from Sanyo Kasei K K as "PEG 200")3 4 00
Toluene 37 69
Methylethyl ketone 37 69
'Polyester resin prepared by using propylene modified bisphenol A and fumaπc acid as raw matenals, a molecular weight of 66,300, a softening point of 108 to 124°C 2A softening point of 142°C, a glass transition point of 47°C 3 A number average molecular weight of 200
An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 1, except for using the composition shown in Table 15 The image-receiving layer had a storage elasticity (G) of 3 x IO2 dyne/cm2 and a loss modulus (G") of 3 x 103 dyne/cm2 The resulting imaged film was evaluated according to substantially the same manner as described in example 1 Table 16 shows the results
Comparative Example 5 An image-receiving layer was formed on one surface of the polyethylene terephthalate film according to substantially the same manner as described in example 9, except for omitting polyethylene glycol The image-receiving layer had a storage elasticity (G) of 2 x IO3 dyne/cm2 and a loss modulus (G") of 2 x IO4 dyne/cm2 The resulting imaged film was evaluated according to substantially the same manner as described in example 9 Table 16 shows the results Table 16
Example 9 C Example 5
Color O D 1 L* C* L* C*
Yellow 0 22 93 09 30 98 90 17 28 23
Magenta 0 14 97 79 12 41 86 84 10 95
( Cyan 0 22 87 21 18 29 84 64 16 08
'Transparent value
The results of table 16 show that a color image having excellent lightness (L*) and saturation (C*) is obtained by including polyalkylene oxide polyol to the image- receiving layer as the plasticizer
Example 10 Table 17
Composition Parts by Weight
Polyester resin (available from Reichhold Chemicals Co as Atlac 382E")1 20 00
Polyester resin (available from Shell Chemical Co as "VITEL 2700")2 0 40
Antistatic agent (available from American Cyanamid Co as "Cyastat 609") 0 20
Silica particles (available from Fuji Silicia Chemical K K "Sailicia 470") 0 03
Polyalkylene glycol (available from Sanyo Kasei K K as "GP 25011)3 4 00
Toluene 37 69
Methylethyl ketone 37 69
Polyester resin prepared by using propylene modified bisphenol A and fumanc acid as raw matenals, a molecular weight of 14,470, a softening point of 94 to 108°C 2A softening point of 142°C, a glass transition point of 47°C 3A number average molecular weight of 250
An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film accordmg to substantially the same manner as described in example 1, except for using the composition shown in Table 17 The image-receiving layer had a storage elasticity (G) of 2 x 105 dyne/cm2 and a loss modulus (G") of 8 x IO2 dyne/cm2 The resulting imaged film was evaluated according to substantially the same manner as described in example 1 Table 18 shows the results Comparative Fxample 6 An image-receiving layer was formed on one surface ofthe polyethylene terephthalate film according to substantially the same manner as described in example 10, except for omitting polyalkylene glycol The image-receiving layer had a storage elasticity (G) of 1 x IO2 dyne/cm2 and a loss modulus (G") of \ 103 dyne/cm2 The resulting imaged film was evaluated according to substantially the same manner as described in example 10 Table 18 shows the results
Table 18
Exam pie 10 C Example 6 |
Color O.D 1 L* C* L* C* Yellow 0 22 93 25 28 15 92 18 27 59
Magenta 0 14 88 47 1 1 73 88 13 11 68
Cyan 0 22 97 96 17 13 86 07 17 06
'Transparent v alue The results of table 18 show that a color image having excellent lightness (L*) and saturation (C*) is obtained by including polyalkylene oxide polyol to the image- receiving layer as the plasticizer
Technical Effects ofthe Invention An image-recording transparent film which can record a transparent image by the use of an electrophotographic recording system, wherein the transparent image has high lightness and saturation and offers good color tone reproducibility in the use for OHP is provided
Brief Explanation of Drawings Fig 1 A cross-sectional view which illustrates one embodiment ofthe present image-recording transparent film
Fig 2 A cross-sectional view which illustrates one aspect of using the present image-recording transparent film Explanation of Numbering:
100 Image-recording transparent film,
101 Film substrate,
102 Image-receiving layer, 200 Image-recording transparent film,
203 Imaging material,
205 Imaging material layer,
206 Imaged film.

Claims

Claims:
1. An image-recording transparent film comprising a light-transmitting film substrate and a light-transmitting image-receiving layer placed on at least one major surface ofthe film substrate, wherein said image-receiving layer contains (a) a thermoplastic resin selected from the group consisting of a polyester resin, a styrene/acrylic resin, an acrylic resin, an epoxy resin, an urethane resin and a polyolefin resin, and (b) a plasticizer selected from the group consisting of (i) the plasticizer having at least one aromatic ring in its molecule and (ii) polyalkylene oxide polyol
2. The image-recording transparent film according to claim 1, wherein the image-receiving layer contains 100 parts by weight ofthe thermoplastic resin and from 1 to 50 parts by weight ofthe plasticizer
3. The image-recording transparent film according to claim 1, wherein the image-receiving layer has a storage elasticity of from 1 x 101 to 1 x 105.
4. An imaged film comprising the image-recording transparent film according to any one of claims 1 to 3 and an imaging material layer which is imagewise placed on a surface ofthe image-receiving layer thereof
PCT/US1996/018524 1995-09-29 1996-11-18 Image-recording transparent film and imaged film WO1997022038A1 (en)

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JP25292095 1995-09-29
JP7/326991 1995-12-15

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EP1400861A3 (en) * 2002-09-18 2006-01-11 Fuji Photo Film Co., Ltd. Electrophotographic image-receiving sheet and process for image formation using the same

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US5989686A (en) * 1997-05-22 1999-11-23 Arkwright Incorporated Color electrophotographic media
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US20010053747A1 (en) * 1997-11-06 2001-12-20 Yoshihiko Tamura Thermal transfer image-receiving sheet
JPH11212292A (en) 1998-01-28 1999-08-06 Dainippon Printing Co Ltd Recording sheet and heating and fixing method of toner image formed on the same
JPH11338180A (en) * 1998-04-28 1999-12-10 Minnesota Mining & Mfg Co <3M> Image recording transparent film and preparation of image recording transparent film
JP2001134003A (en) * 1999-10-29 2001-05-18 Nippon Paper Industries Co Ltd Sheet for electrophotographic overhead projector
US6291396B1 (en) * 1999-12-15 2001-09-18 Eastman Kodak Company Plasticized cross-linked receiving element for thermal dye transfer

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