CA1150092A - Image-receiving sheet for a sublimable dye-former including a colour developing layer and a superimposed dielectric layer - Google Patents
Image-receiving sheet for a sublimable dye-former including a colour developing layer and a superimposed dielectric layerInfo
- Publication number
- CA1150092A CA1150092A CA000360953A CA360953A CA1150092A CA 1150092 A CA1150092 A CA 1150092A CA 000360953 A CA000360953 A CA 000360953A CA 360953 A CA360953 A CA 360953A CA 1150092 A CA1150092 A CA 1150092A
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- Prior art keywords
- image
- receiving sheet
- dielectric layer
- particles
- color
- Prior art date
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- Thermal Transfer Or Thermal Recording In General (AREA)
- Photoreceptors In Electrophotography (AREA)
Abstract
TITLE OF THE INVENTION
Image-Receiving Sheet ABSTRACT OF THE DISCLOSURE
An image-receiving sheet for receiving a particle image electrostatically formed on a photoconductive surface and for fixing thereon a dye-image obtained by developing a sublim-able dye contained in the image particles. The sheet comprises a support member, color forming layer disposed on the support member and a dielectric layer disposed on the color forming layer. The color forming layer contains a developer material for developing the sublimable dye. The dielectric layer exhibits, in a low humidity range, a surface resistivity high enough to electrostatically retain the particles on the surface thereof and also exhibits adhesion high enough to adhesively retain the particles in high humidity range where the surface resistivity is below the required value for retaining the particles.
Image-Receiving Sheet ABSTRACT OF THE DISCLOSURE
An image-receiving sheet for receiving a particle image electrostatically formed on a photoconductive surface and for fixing thereon a dye-image obtained by developing a sublim-able dye contained in the image particles. The sheet comprises a support member, color forming layer disposed on the support member and a dielectric layer disposed on the color forming layer. The color forming layer contains a developer material for developing the sublimable dye. The dielectric layer exhibits, in a low humidity range, a surface resistivity high enough to electrostatically retain the particles on the surface thereof and also exhibits adhesion high enough to adhesively retain the particles in high humidity range where the surface resistivity is below the required value for retaining the particles.
Description
~5~ Z
BACKGROUND OF THE INVENTION
This invention relates to electrostatic recording and more particularly relates to an image~receiving sheet adapted to receive on the surface thereof a particle image electro-statically formed on a photoconductive surface and whereon a final colored-image is fixed.
The image-receiving sheet of this invention is used Eor the electrostatic recording process, for example, such as disclosed in British Patent 1527168. In that proc~ss there are provided an image composingparticles containing a colorless sublimable dye. The image-receiving sheet contains a developer which reacts with the colorless sublimable dye to develop a color. The particles are ~ormed on a photoconductive insulating surface by a suitable electrostatic method and -then are transferred to the image-receiving sheet. The particles are then heated, whereby the colorless sublimable dye pr~sent in the particlesis sublimed and reacted with the developer present in the image-receiving sheet to develop a color. The remaining parts of the image composing particles are then removed from the surface of the image-receiviI~g sheet. Thus,the fixed dye-image is obtained on the image-receiving sheet.
In such process, the following method of forming the particle image is especially useful. The photoconductive surface is charged and the image composing particles are laid uniformly thereon. The image composing particle is transmissive -to a light of selected color, i.e. functions as a color fil-ter, further to containing a sublimable dye as above mentioned. The photo-conductive surface is exposed to imagewise light through the image composing particles, thereby forming an electrostatic image corresponding to an image of selected color oE light. Then the image composing particles in the area where the electrostatic ~ 2 -~5~92 attractive force is weakened in accordance with the ~lectrostatic image are removed, whereby the particle image is obtained. By utilizing such process, a multicolored dye .image can be formed through only one exposure as described in sritish Patent 1527168.
As a matter of course the particle image formation according to the usual xerography may be used.
As an image-receiving sheet applicable to the above-mentioned process, there has been proposed a s-tructure such that a color forming layer containing a developer material is disposed on a support member such as paper and on the color Eorming layer is disposed a dielectric surface layer which serves to electrostatically retain the transferred image-composing particles.
The dielectric layer necessarily has a structure such -tha-t the sublimed dye gas can pass there-through to the color forming layer.
Therefore the surface resistivity of the dielectric layer de-creases due to moisture absorption under a hi~h humiclity atmosphere such as a relative humidity of more than 60%. Thus the electrostatic charge on the dielectric layer is decreased under high humidity, resulting in low efficiency of transfer of the image composing particles from the photoconductive surface to the image-receiving sheet.
- SUMMARY OF T~E INVENTION
It is an object of the invention to provide an image-receiving sheet which can efficiently retain image composing particles transferred from a photoconductive surface over the practical range of humidity in the atmosphere.
: An image-receiving sheet according to this invention comprises a supporting member, a color forming layer disposed on ~he suppor-ting member and containing a developer material which reacts wi-th a sublimable dye -to develop a color, and a dielectric layer coated on the color forming layer, -the dlelectric layer exhibiting high surEace resistivity in the low humidity range in the atmosphere and e~hibiting high adhesion in the high humidity range where the surface resistivity thereof is lower -than the required value.
More specifically, the image-receiving sheet for receiving an electrostatically formed image according to the present invention bears an image comprising particles containing a sublimable dye-former on which is fixed a colored image obtained by making said sublimable dye-former react with a developer contained in the sheet.
Said sheet comprises a suppor-t member, a color developing layer formed on said support member and containing a developer ma-terial which reacts with a sublimable dye-former to develop a color, the surface resistivity thereof being less than 109Q, and a dielectric layer formed on said color developing layer through which sublimed dye-former gas can pass to said color developing layer, said dielectric layer comprising a fine inorganic powder and a transparent binder-resin having high resistivity.
sRIEF DESCRTPTION OF THE DRAWING
Figure is a sectional view of an image-receiving sheet according to the inven-tion.
DETAILED DESCRIPTION OF TEIE INVENTION
Referring to the Figure, a supporting paper 1 is coated with a color forming layer 2, and a dielectric layer 3 is formed on the color forming layer 2. The color -forming layer
BACKGROUND OF THE INVENTION
This invention relates to electrostatic recording and more particularly relates to an image~receiving sheet adapted to receive on the surface thereof a particle image electro-statically formed on a photoconductive surface and whereon a final colored-image is fixed.
The image-receiving sheet of this invention is used Eor the electrostatic recording process, for example, such as disclosed in British Patent 1527168. In that proc~ss there are provided an image composingparticles containing a colorless sublimable dye. The image-receiving sheet contains a developer which reacts with the colorless sublimable dye to develop a color. The particles are ~ormed on a photoconductive insulating surface by a suitable electrostatic method and -then are transferred to the image-receiving sheet. The particles are then heated, whereby the colorless sublimable dye pr~sent in the particlesis sublimed and reacted with the developer present in the image-receiving sheet to develop a color. The remaining parts of the image composing particles are then removed from the surface of the image-receiviI~g sheet. Thus,the fixed dye-image is obtained on the image-receiving sheet.
In such process, the following method of forming the particle image is especially useful. The photoconductive surface is charged and the image composing particles are laid uniformly thereon. The image composing particle is transmissive -to a light of selected color, i.e. functions as a color fil-ter, further to containing a sublimable dye as above mentioned. The photo-conductive surface is exposed to imagewise light through the image composing particles, thereby forming an electrostatic image corresponding to an image of selected color oE light. Then the image composing particles in the area where the electrostatic ~ 2 -~5~92 attractive force is weakened in accordance with the ~lectrostatic image are removed, whereby the particle image is obtained. By utilizing such process, a multicolored dye .image can be formed through only one exposure as described in sritish Patent 1527168.
As a matter of course the particle image formation according to the usual xerography may be used.
As an image-receiving sheet applicable to the above-mentioned process, there has been proposed a s-tructure such that a color forming layer containing a developer material is disposed on a support member such as paper and on the color Eorming layer is disposed a dielectric surface layer which serves to electrostatically retain the transferred image-composing particles.
The dielectric layer necessarily has a structure such -tha-t the sublimed dye gas can pass there-through to the color forming layer.
Therefore the surface resistivity of the dielectric layer de-creases due to moisture absorption under a hi~h humiclity atmosphere such as a relative humidity of more than 60%. Thus the electrostatic charge on the dielectric layer is decreased under high humidity, resulting in low efficiency of transfer of the image composing particles from the photoconductive surface to the image-receiving sheet.
- SUMMARY OF T~E INVENTION
It is an object of the invention to provide an image-receiving sheet which can efficiently retain image composing particles transferred from a photoconductive surface over the practical range of humidity in the atmosphere.
: An image-receiving sheet according to this invention comprises a supporting member, a color forming layer disposed on ~he suppor-ting member and containing a developer material which reacts wi-th a sublimable dye -to develop a color, and a dielectric layer coated on the color forming layer, -the dlelectric layer exhibiting high surEace resistivity in the low humidity range in the atmosphere and e~hibiting high adhesion in the high humidity range where the surface resistivity thereof is lower -than the required value.
More specifically, the image-receiving sheet for receiving an electrostatically formed image according to the present invention bears an image comprising particles containing a sublimable dye-former on which is fixed a colored image obtained by making said sublimable dye-former react with a developer contained in the sheet.
Said sheet comprises a suppor-t member, a color developing layer formed on said support member and containing a developer ma-terial which reacts with a sublimable dye-former to develop a color, the surface resistivity thereof being less than 109Q, and a dielectric layer formed on said color developing layer through which sublimed dye-former gas can pass to said color developing layer, said dielectric layer comprising a fine inorganic powder and a transparent binder-resin having high resistivity.
sRIEF DESCRTPTION OF THE DRAWING
Figure is a sectional view of an image-receiving sheet according to the inven-tion.
DETAILED DESCRIPTION OF TEIE INVENTION
Referring to the Figure, a supporting paper 1 is coated with a color forming layer 2, and a dielectric layer 3 is formed on the color forming layer 2. The color -forming layer
2 contains, as a principal component, an activated clay 4 which acts as a developer for a sublimable dye. The color forming ~L~L5Cl C19Z
layer 2 also contains fine inorganic powders 5 and 6 having a white color. The activated clay 4 and the inorganic powders 5 and 6 are dispersed into plastic binder 7. The sur~ace resistivity of the color forming layer 2 is less than 109~ and so the layer 2 can act as an electrode for preventing image composing particles from being scattered by an applied voltage during an electrostatic transfer of the particles. Thus it is desirable that the activated clay 4 be of low particle resistivity.
The inorganic powder 5 serves to prevent yellowing of the color forming layer 2 due to heating and may be a calcium carbonate. The inorganic powder 6 serves as a develop-ing assistant agent and may be a silica. These inorganic powders are also eEfective for improvinc~ heat resistance. The binder 7 should have high binding powder and hardly be yellowed by heating. For example, styrene-butadiene copolymer, acrylic resin or polyvinyl acetate may be used. Especially, water-based emulsions of those resins are preferable because they do not so much conceal - 4a -,, . ~
the activated clay, which is favorable for obtaining high density color development.
The appropriate ratio of those components is that the amount of the inorganic powders 5 and 6 is 20 to 80 parts by weight and the binder 7, 10 to 30 parts by weight to 100 parts by weight of the activated clay 4. A dispersant such as a surface-active agent, etc. may be used.
The coating amount of the color forming layer 2 is pre-ferably 5 to 10 g/m2 for obtaining low surface resistance and sufficient density of color development. The color forming layer:is preferably subjected to càlendering for making the surface resistance uniform.
The supporting paper 1 is preferably a fine quality paper having smooth surface which does not repel coa-ting, whereby a uniform surface of coated layer is obtained.
The dielectric layer 3 is composed of a release agent 8. a fine inorganic powder 9 and a binder 10. The release agent 8 makes it easy to release the image composing particles from the surface of the dielectric layer 3 after the heating for develop-ing color. The inorganic powder 9 has a white color and permitsthe dye-gas sublimed from the image composing particles to pass through the dielectric layer 3 to the color forming layer 2.
The release agent 8 may be fin~ particles of a trans~
parent or white polyethylene. It is prepared in water-based emul-sion state. The inorganic powder 9 may be a silica which is effective for assisting the development, and is preferably pre-pared by wet process, i.e. a colloidal silica, because it has high activity. The binder 10 should have the properties of high resistivity, strong binding power to the color forming layer and large bending strength. Further the binder 10 should exhibit, under a high humidity atmosphere such as a relative humidity of more than 60%, adhesion sufficient to retain the 9~
image composingparticles through the infuuence of moisture, It also should have the property that sublimed dye-gas can easily pass therethrough~ Styrene-butadiene copolymer may be used as the binder 10 and it is prepared in the form of a water based emulsion.
The amoun-t of silica used in the dielectric layer 3 should be in the range of from 25 to 70 parts by weight to 100 parts by weight of the total amount of the release agent 8 of polystyrene and the binder 10 of styrene-butadiene copolymer.
Below that range, the dielectric layer 3 has so low a heat resis-tance that it is diEficult to remove the image composing particles after the heat development, because of the softening of the layer 3. At above that range t:he dielectric layer 3 has low resistivity and low adhesion unde~ low humidity so as not to be ab~e to sufficiently retain the image composing particles. The amount o styrene-butadiene copolymer should be in the range from 0.3 to 1 parts by weight to 1 part by weigh-t of polystyrene. ~t below that range, the binding power becomes insufficient and at above that range the adhesion under high humidity becomes so high that it is difficult to remove the image composing particles after heating for color development.
A dispersant such as a surface-active agent or a thicken-ing agent may be used when those components are dispersed and mixed, The coating thickness of the dielectric layer 3 is preferably 2 to 5 g/m2. In such range the path from the image composing particle to the color forming layer 2 through which sublimed dye gas passes is short enough to obtain desirable density of developed color, and besides, a suEficient efficiency of transfer of the image composing particles is obtained.
The particle diameters of polystyrene and styrene-butadiene copolymer is preferably from 0.1 to 0.5 ~ and that of silica is preferably from 0.1 to 0.001 ~.
The thus obtained dielectric layer 3 exhibits a surface resistivity more than 101 ~ under the atmosphere of relative humidity below 60% so as to be able to electrostatically retain the image composing particles. It also exhibits, under a relative humidity above 60%, an adhesion sufficient to retain the image composing particles. The relative humidity at above which the suEficient adhesion is obtained changes in proportion to the ratio of the components. In above description, sufficient adhesion means the extent to which particles are retained under a linear pressure of 100 to 1000 g/cm, the efEiciency of transferring particles with the diameter of 5 to 50 ~ being more than 80%, and the retained particles being removed by using fur brush after heat development for 1.5 seconds at 230~C.
A detailed example is described hereinafter.
According to the following formulation, coatings for forming a color forming layer and a dielectric layer were pre-pared. In the following formulation the amount of each compo-nent is shown by the amount of solid content.
Coating for a color forming layer:
Activated clay : 100 parts by weight Calcium carbonate : 30 parts by weight Colloidal silica (in which the ratio of solid content ~` is 20%) : 20 parts by weight Styrene-Butadiene copolymer (in which the ratio oE
solid content is 50~) : 15 parts by weight Water : ~35 par-ts by weight ~s~9~
Coating for a dielectric layer;
Water dispersion of low molecular weight polyethylene (in which ` the ratio of solid content is 20~) : 100 parts by weight Colloidal silica (in which the ratio of solid content is 20~) : 60 parts by weight Styrene-butadiene copolymer ; 10 (in whi~h the ratio of solid content is 50%) : 50 parts by weight The coating for a color forming layer was prepared by dispersing the components for 30 minutes with an attritor. Cal-cium carbonate is used after disperslng, with water mixed, for 1 hour with an attritor. The coating i~or a dielectric layer was prepared by mixing the component with stirrer.
The coating for a color forming layer was coated on a fine quality paper at 8 g/m2 which represents the value after drying,and then the coated layer was subjected to calendering. The thus ormed color forming layer was coated with the coating for a dielectric layer at 3 g/m2 which represents the value after drying,and then calendering was carried out.
The thus obtained image-receiving sheet was measured for .
the surface resistivity and the particle transfer eEficiency under various humidities in a constant temperature bath. The temperature of the bath was maintained at 30C and the humidity was varied. The measurement was performed after keeping the image receiving sheet in the constant temperature bath for one hour.
The particle transfer efficiency was measured by performing a transfer process such that the dielectric layer surEace of the image receiving sheet was closely contacted with the image compos-ing particles which are electrostatically retained onto a photo-~5~92 conductiye plate comp~sed by coating a zinc oxide photoconductivelayer on an aluminum plate, and the voltage oE 1.0 KV was sup-plied between the conductive layer of the photoconductive plate and the back surface of the image-receiving sheet, with the image-receiving sheet being pressed on the particles. The result of the measurement is shown in the following Table.
.
Relative humidity Surface resistivi~-ty~ Transfer efficiency ( % ) ( 11 ) ( % ) 24 2.~9 x 1ol3 90 4.0 x 1012 90 9.2 x 101 85 _ 8.2 x 108 85 to 80 I .
93 4.6 x 108 80 .
In the measurement where the humiditles of 80~ and 93~ were employed, the particle transfer was performed by only applying pressure. <
The image composing particles were scarcely scatter-ed by the transfer. The transfer properties were similar in both cases of using a nonconductive image-composing-particle and a conductive particle.
In order to examine a developed dye image, the image composing particles transferred to the image-receiving sheet were pressed by a hot plate with -the temperature of 230C for 1.5 seconds, and then the remainder of the particles were removed. The thus obtained dye image had fully developed color and was clear, without fogging.
Further, the image composing particles could be com-pletely removed even in -the case where -the above-mentioned process was performed under the rela-tive humidity of ~0~ or 93~.
layer 2 also contains fine inorganic powders 5 and 6 having a white color. The activated clay 4 and the inorganic powders 5 and 6 are dispersed into plastic binder 7. The sur~ace resistivity of the color forming layer 2 is less than 109~ and so the layer 2 can act as an electrode for preventing image composing particles from being scattered by an applied voltage during an electrostatic transfer of the particles. Thus it is desirable that the activated clay 4 be of low particle resistivity.
The inorganic powder 5 serves to prevent yellowing of the color forming layer 2 due to heating and may be a calcium carbonate. The inorganic powder 6 serves as a develop-ing assistant agent and may be a silica. These inorganic powders are also eEfective for improvinc~ heat resistance. The binder 7 should have high binding powder and hardly be yellowed by heating. For example, styrene-butadiene copolymer, acrylic resin or polyvinyl acetate may be used. Especially, water-based emulsions of those resins are preferable because they do not so much conceal - 4a -,, . ~
the activated clay, which is favorable for obtaining high density color development.
The appropriate ratio of those components is that the amount of the inorganic powders 5 and 6 is 20 to 80 parts by weight and the binder 7, 10 to 30 parts by weight to 100 parts by weight of the activated clay 4. A dispersant such as a surface-active agent, etc. may be used.
The coating amount of the color forming layer 2 is pre-ferably 5 to 10 g/m2 for obtaining low surface resistance and sufficient density of color development. The color forming layer:is preferably subjected to càlendering for making the surface resistance uniform.
The supporting paper 1 is preferably a fine quality paper having smooth surface which does not repel coa-ting, whereby a uniform surface of coated layer is obtained.
The dielectric layer 3 is composed of a release agent 8. a fine inorganic powder 9 and a binder 10. The release agent 8 makes it easy to release the image composing particles from the surface of the dielectric layer 3 after the heating for develop-ing color. The inorganic powder 9 has a white color and permitsthe dye-gas sublimed from the image composing particles to pass through the dielectric layer 3 to the color forming layer 2.
The release agent 8 may be fin~ particles of a trans~
parent or white polyethylene. It is prepared in water-based emul-sion state. The inorganic powder 9 may be a silica which is effective for assisting the development, and is preferably pre-pared by wet process, i.e. a colloidal silica, because it has high activity. The binder 10 should have the properties of high resistivity, strong binding power to the color forming layer and large bending strength. Further the binder 10 should exhibit, under a high humidity atmosphere such as a relative humidity of more than 60%, adhesion sufficient to retain the 9~
image composingparticles through the infuuence of moisture, It also should have the property that sublimed dye-gas can easily pass therethrough~ Styrene-butadiene copolymer may be used as the binder 10 and it is prepared in the form of a water based emulsion.
The amoun-t of silica used in the dielectric layer 3 should be in the range of from 25 to 70 parts by weight to 100 parts by weight of the total amount of the release agent 8 of polystyrene and the binder 10 of styrene-butadiene copolymer.
Below that range, the dielectric layer 3 has so low a heat resis-tance that it is diEficult to remove the image composing particles after the heat development, because of the softening of the layer 3. At above that range t:he dielectric layer 3 has low resistivity and low adhesion unde~ low humidity so as not to be ab~e to sufficiently retain the image composing particles. The amount o styrene-butadiene copolymer should be in the range from 0.3 to 1 parts by weight to 1 part by weigh-t of polystyrene. ~t below that range, the binding power becomes insufficient and at above that range the adhesion under high humidity becomes so high that it is difficult to remove the image composing particles after heating for color development.
A dispersant such as a surface-active agent or a thicken-ing agent may be used when those components are dispersed and mixed, The coating thickness of the dielectric layer 3 is preferably 2 to 5 g/m2. In such range the path from the image composing particle to the color forming layer 2 through which sublimed dye gas passes is short enough to obtain desirable density of developed color, and besides, a suEficient efficiency of transfer of the image composing particles is obtained.
The particle diameters of polystyrene and styrene-butadiene copolymer is preferably from 0.1 to 0.5 ~ and that of silica is preferably from 0.1 to 0.001 ~.
The thus obtained dielectric layer 3 exhibits a surface resistivity more than 101 ~ under the atmosphere of relative humidity below 60% so as to be able to electrostatically retain the image composing particles. It also exhibits, under a relative humidity above 60%, an adhesion sufficient to retain the image composing particles. The relative humidity at above which the suEficient adhesion is obtained changes in proportion to the ratio of the components. In above description, sufficient adhesion means the extent to which particles are retained under a linear pressure of 100 to 1000 g/cm, the efEiciency of transferring particles with the diameter of 5 to 50 ~ being more than 80%, and the retained particles being removed by using fur brush after heat development for 1.5 seconds at 230~C.
A detailed example is described hereinafter.
According to the following formulation, coatings for forming a color forming layer and a dielectric layer were pre-pared. In the following formulation the amount of each compo-nent is shown by the amount of solid content.
Coating for a color forming layer:
Activated clay : 100 parts by weight Calcium carbonate : 30 parts by weight Colloidal silica (in which the ratio of solid content ~` is 20%) : 20 parts by weight Styrene-Butadiene copolymer (in which the ratio oE
solid content is 50~) : 15 parts by weight Water : ~35 par-ts by weight ~s~9~
Coating for a dielectric layer;
Water dispersion of low molecular weight polyethylene (in which ` the ratio of solid content is 20~) : 100 parts by weight Colloidal silica (in which the ratio of solid content is 20~) : 60 parts by weight Styrene-butadiene copolymer ; 10 (in whi~h the ratio of solid content is 50%) : 50 parts by weight The coating for a color forming layer was prepared by dispersing the components for 30 minutes with an attritor. Cal-cium carbonate is used after disperslng, with water mixed, for 1 hour with an attritor. The coating i~or a dielectric layer was prepared by mixing the component with stirrer.
The coating for a color forming layer was coated on a fine quality paper at 8 g/m2 which represents the value after drying,and then the coated layer was subjected to calendering. The thus ormed color forming layer was coated with the coating for a dielectric layer at 3 g/m2 which represents the value after drying,and then calendering was carried out.
The thus obtained image-receiving sheet was measured for .
the surface resistivity and the particle transfer eEficiency under various humidities in a constant temperature bath. The temperature of the bath was maintained at 30C and the humidity was varied. The measurement was performed after keeping the image receiving sheet in the constant temperature bath for one hour.
The particle transfer efficiency was measured by performing a transfer process such that the dielectric layer surEace of the image receiving sheet was closely contacted with the image compos-ing particles which are electrostatically retained onto a photo-~5~92 conductiye plate comp~sed by coating a zinc oxide photoconductivelayer on an aluminum plate, and the voltage oE 1.0 KV was sup-plied between the conductive layer of the photoconductive plate and the back surface of the image-receiving sheet, with the image-receiving sheet being pressed on the particles. The result of the measurement is shown in the following Table.
.
Relative humidity Surface resistivi~-ty~ Transfer efficiency ( % ) ( 11 ) ( % ) 24 2.~9 x 1ol3 90 4.0 x 1012 90 9.2 x 101 85 _ 8.2 x 108 85 to 80 I .
93 4.6 x 108 80 .
In the measurement where the humiditles of 80~ and 93~ were employed, the particle transfer was performed by only applying pressure. <
The image composing particles were scarcely scatter-ed by the transfer. The transfer properties were similar in both cases of using a nonconductive image-composing-particle and a conductive particle.
In order to examine a developed dye image, the image composing particles transferred to the image-receiving sheet were pressed by a hot plate with -the temperature of 230C for 1.5 seconds, and then the remainder of the particles were removed. The thus obtained dye image had fully developed color and was clear, without fogging.
Further, the image composing particles could be com-pletely removed even in -the case where -the above-mentioned process was performed under the rela-tive humidity of ~0~ or 93~.
Claims (11)
1. An image-receiving sheet for receiving an electrostatically formed image, said image comprising particles containing a sublimable dye-former on which is fixed a colored image obtained by making said sublimable dye-former react with a developer contained in the sheet, said sheet comprising:
a support member;
a color developing layer formed on said support member and containing a developer material which reacts with a sublimable dye-former to develop a color, the surface resistivity thereof being less than 109.OMEGA.; and a dielectric layer formed on said color develop-ing layer through which sublimed dye-former gas can pass to said color developing layer, said dielectric layer comprising a fine inorganic powder and a transparent binder-resin having high resistivity.
a support member;
a color developing layer formed on said support member and containing a developer material which reacts with a sublimable dye-former to develop a color, the surface resistivity thereof being less than 109.OMEGA.; and a dielectric layer formed on said color develop-ing layer through which sublimed dye-former gas can pass to said color developing layer, said dielectric layer comprising a fine inorganic powder and a transparent binder-resin having high resistivity.
2. An image-recieving sheet as claimed in claim 1, wherein said dielectric layer further comprises a release agent for making it easy to release said image composing particles adhered to the dielectric layer therefrom.
3. An image-receiving sheet as claimed in claim 1, wherein said inorganic powder is effective as an assistant for developing said sublimable dye-former.
4. An image-receiving sheet as claimed in claim 2, wherein said release agent comprises a fine polyethylene powder.
5. An image-receiving sheet as claimed in claim 1, wherein said inorganic powder comprises a silica.
6. An image-receiving sheet as claimed in claim 1, wherein said binder comprises a styrene-butadiene copolymer.
7. An image-receiving sheet as claimed in claim 2, wherein said release agent is a fine polyethylene powder, said inorganic powder is silica and said binder is a styrene-butadiene copolymer, the ratio of said components being such that the amount of said silica is 25 to 70 parts by weight to 100 parts by weight of the total amount of said polyethylene and styrene -butadiene copolymer.
8. An image-receiving sheet as claimed in claim 7, wherein the amount of said styrene-butadiene copolymer is 0.3 to 1 parts by weight to 1 part by weight of said polyethylene.
9. An image-receiving sheet as claimed in claim 1, wherein said color developing layer comprises said developer material, a fine inorganic powder and a binder.
10. An image-receiving sheet as claimed in claim 1, wherein said developer material comprises an activated clay.
11. An image-receiving sheet as claimed in claim 10, wherein said inorganic powder comprises a calcium carbonate and a silica.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000360953A CA1150092A (en) | 1980-09-24 | 1980-09-24 | Image-receiving sheet for a sublimable dye-former including a colour developing layer and a superimposed dielectric layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000360953A CA1150092A (en) | 1980-09-24 | 1980-09-24 | Image-receiving sheet for a sublimable dye-former including a colour developing layer and a superimposed dielectric layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1150092A true CA1150092A (en) | 1983-07-19 |
Family
ID=4117977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000360953A Expired CA1150092A (en) | 1980-09-24 | 1980-09-24 | Image-receiving sheet for a sublimable dye-former including a colour developing layer and a superimposed dielectric layer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1150092A (en) |
-
1980
- 1980-09-24 CA CA000360953A patent/CA1150092A/en not_active Expired
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