GB2222700A - Photographic roll film assembly - Google Patents
Photographic roll film assembly Download PDFInfo
- Publication number
- GB2222700A GB2222700A GB8920533A GB8920533A GB2222700A GB 2222700 A GB2222700 A GB 2222700A GB 8920533 A GB8920533 A GB 8920533A GB 8920533 A GB8920533 A GB 8920533A GB 2222700 A GB2222700 A GB 2222700A
- Authority
- GB
- United Kingdom
- Prior art keywords
- polyethylene
- layer
- emulsion
- gelatinous
- roll film
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- -1 polyethylene Polymers 0.000 claims abstract description 80
- 239000004698 Polyethylene Substances 0.000 claims abstract description 71
- 229920000573 polyethylene Polymers 0.000 claims abstract description 68
- 239000000839 emulsion Substances 0.000 claims abstract description 57
- 239000002245 particle Substances 0.000 claims abstract description 26
- 229910052709 silver Inorganic materials 0.000 claims abstract description 10
- 239000004332 silver Substances 0.000 claims abstract description 10
- 239000006229 carbon black Substances 0.000 claims abstract description 6
- 108010010803 Gelatin Proteins 0.000 claims description 12
- 229920000159 gelatin Polymers 0.000 claims description 12
- 239000008273 gelatin Substances 0.000 claims description 12
- 235000019322 gelatine Nutrition 0.000 claims description 12
- 235000011852 gelatine desserts Nutrition 0.000 claims description 12
- 239000003139 biocide Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000003115 biocidal effect Effects 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 230000003068 static effect Effects 0.000 abstract description 9
- 229920001577 copolymer Polymers 0.000 abstract description 7
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 abstract description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 42
- 238000000576 coating method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 235000019241 carbon black Nutrition 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001045 blue dye Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
- G03C1/7614—Cover layers; Backing layers; Base or auxiliary layers characterised by means for lubricating, for rendering anti-abrasive or for preventing adhesion
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C3/00—Packages of films for inserting into cameras, e.g. roll-films, film-packs; Wrapping materials for light-sensitive plates, films or papers, e.g. materials characterised by the use of special dyes, printing inks, adhesives
- G03C3/02—Photographic roll-films with paper strips
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Laminated Bodies (AREA)
Abstract
A roll film assembly comprises on a flanged spool a roll film wrapper (11) which consists of a laminate of paper (13) and polyethylene (12) incorporating carbon black particles, the wrapper being helically wound on the outside of a photographic film which comprises on a film base (5) on one side at least one colloidal silver-halide emulsion layer (4) and on the reverse side a gelatinous top coat (7) which contains a polyethylene emulsion or a polyethylene copolymer emulsion or is coated with a layer of polyethylene (9) this gelatinous or polyethylene layer being in rolled contact with the polyethylene side of the roll film wrapper. Polyethylene reduces the static when the wrapper is removed. The gelatinous layer (7) may contain anti-block particles (8) and a similar layer (1) with anti-block particles (2) and a thin coat of polyethylene (3) may be coated over silver halide emulsion layer (4). Specified copolymers are acrylic acid or vinyl acetate with ethylene, ethylene being at least 70% of the copolymer. <IMAGE>
Description
PHOTOGRAPHIC Fi# ASSEMBLY
This invention relates to a roll film assembly.
Roll film backing paper, which is paper to which so called roll film is attached, the roll being wrapped on spool with flanged ends, used to be made of paper covered with a black paint on the side distal to the emulsion layer and light coloured paint on the emulsion side on which the frame number and other indicia were printed. However it was difficult to get such paper ccktrpletely light-opaque and looking attractive. Thus in recent years roll-film backing paper has consisted of white paper on to which has been laminated a plastics material layer containing carbon-black particles.This solved the lack of opaqueness problem and had a more attractive appearance but it was found that during processing when the film was separated from the wrapper an electrostatic discharge sometimes occurred which caused the developed film to exhibit characteristic discharge marks.
We have discovered a roll film assembly in which this problem is alleviated.
Therefore according to the present invention there is provided a roll film assembly which comprises on a flanged spool a roll film wrapper which consists of a laminate of paper and polyethylene incorporating carbon black particles, the wrapper being helically wound on the outside of a photographic film which comprises on a film base on one side at least one colloidal silver-halide emulsion layer and on the reverse side a gelatinous top coat which comprises a polyethylene emulsion or a polyethylene copolymer emulsion, this said gelatinous layer being in rolled contact with the polyethylene side of the roll film wrapper.
Usually there is present on the side of the film base which comprises the colloidal silver halide layer one or two gelatinous silver halide emulsion layers, an undercoat and a top coat and there is present on the emulsion top coat a gelatinous non-stress layer.
It has been found that if the gelatinous non-stress layer also comprises a polyethylene emulsion or a polyethylene copolymer emulsion there is also a reduction in friction during the course of manufacture of the roll film assembly and also during processing. Further a reduction in the starry night effect is observed when the non-stress layer also comprises polymer anti-block particles.
Most usually there is present on the reverse side of the film base to the silver halide emulsion coated side an anti-halation gelatinous dye layer and on this layer is coated the gelatinous layer which comprises the polyethylene emulsion as a non-stress layer. As thinner film base is usually used for roll films than for 35 mm films a fairly thick anti-halation layer is required to prevent film curl.
The polyethylene emulsions of use in this invention are widely available and are used as floor waxes and printing ink bases, as well as moisture - proof coatings for paper. The polyethylene emulsions are also knawn as polyethylene waxes, and are prepared by emulsifying, at high temperature, a thermally degraded or oxidised and therefore low molecular weight polyethylene (or acrylicethylene copolymer) in the presence of surfactants, and then rapidly shock-cooling the emulsion so formed to well below the melting point of the polyethylene. This results in the formation of a stable, clear dispersion of the polyethylene particles. Different molecular weights and copolymer copoos it ions of ethylene may be used to give different softening points of the final coating, and hence different degrees of hardness of the dry polyethylene layer.Also various surfactants may be used, for example anionic or cationic or nonionic.
The polyethylene emulsions may have been prepared by any of the procedures knawn in the prior art, for example by direct emulsion polymerisation of ethylene monomer or by the emulsification of a pre-formed polyethylene.
In the latter case, the polyethylene is added to water along with surfactants in a reaction vessel which may or may not be pressurised depending upon the temperature required to melt the polyethylene. The vessel is heated to melt the pofyethylene and very efficient stirring then generates a polyethylene emulsion. When a satisfactory emulsion has been formed, the emulsion is pumped thrcagh an efficient heat exchanger which has the effect of shock-cooling the latex.
This is necessary otherwise the particles of PE will agglomerate unless the temperature is dropped below the melting point of the PE.
The result is a polyethylene emulsion of small particle size.
The surfactant systems used in forming the PE latex may be anionic, non-ionic or mixtures thereof.
The polyethylene emulsion thus formed may have solids contents of up to about 40%, pH values of 6 to 12 (typically) and viscosities below about 100 cps.
The polyethylene used to produce the dispersions of the preformed type mentioned above may be of varied nolecular weight, may be low or high density, and may be homspolymer or copolymer e.g. with vinyl acetate or acrylic acid. The polymer may further have been oxidised or thermally degraded to give a polyethylene suitable for forming a dispersion of the above type.
The particle size of the particles in the polyethylene emulsion should preferably be less than 150 nm and most preferably less than 100 nm, since optical scattering will occur if larger particle sizes are used.
The polyethylene particles in the emulsion may have a melt temperature from approximately 80 to approximately 140 C.
The polyethylene emulsion may contain other additives for example biocides, antioxidants and, colloid stabilisers.
The preferred amount of polyethylene emulsion as the solid polyethylene present in the gelatinous layer is from 2 to 100 g per 1000 g of gelatin and most preferably 20 - 50g per lO00g gelatin.
There may be present in the gelatinous layer as well as the polyethylene emulsion a biocide, for example phenol, wetting agents, a hardening agent and anti-block particles for example silica particles.
The polyethylene layer which is applied to the paper to form the laminate may be a polyethylene hcmapolymer or it may be a copolymer of ethylene and another copolymerisable monomer for example acrylic acid or vinyl acetate. The percentage of ethylene units in such a copolymer is at least 70%.
The polyethylene layer usually comprises at least 8% by weight of carbon black particles to render the layer light opaque.
The polyethylene layer is usually extruded on to the paper base to form a layer from 5 to 50 microns thick.
The presence of the polyethylene emulsion in the gelatinous layer has been found to reduce static discharge when the roll film is separated from the wrapper during processing. This reduction is considered to be due to a reduction in tribo-charging. Triboelectric series have been compiled to show how surfaces of different materials charge when contacted with each other. In the case of this invention the surface of the gelatinous layer has been changed to make it similar to the polyethylene layer by the incorporation of the polyethylene emulsion.
Surprisingly polyethylene emulsions are compatible with gelatin and can be incorporated into a gelatinous coating solution of the type used to coat photographic materials.
Moreover when the polyethylene emulsion is also present in the gelatinous nonstress layer the development of the exposed silver halide emulsion layer beneath it is not affected. Further the sharpness of the developed image is not diminished.
The following Examples will serve to illustrate the invention.
EXAMPLE I
Two roll film assemblies were prepared. The wrapping paper in each case comprised paper base on which was laminated a polyethylene layer 15 microns thick containing 10% carbon black by weight.
The roll films used were the same except for one layer. Both consisted of triacetate film base on which was coated on one side a silver halide emulsion undercoat and a silver halide emulsion top coat. On this top coat emulsion there was coated a gelatin non-stress coat. On the other side of the film base there was coated a gelatin layer containing an anti-halation dye. On this layer was coated in both cases a gelatin layer containing a wetting agent. In the case of sample 1 there was no further addition to this layer but in the case of sample 2 there was added to the coating solution for this gelatin layer 6 g of polyethylene emulsion per lOOg of gelatin.
In the case of both samples the film and wrapping paper were tightly helically wound on a flanged spool with the polyethylene layer of the wrapping paper in contact with the gelatin layer on the reverse side of the film base to the silver halide emulsions. Four roll film assemblies of each sample were prepared and exposed in a camera. The electrcstatic charge generated during the separation of the roll film fran the wrapper were then measured. The results shown are the average for the four tests on each sample.
Separation Charge Kv an-i Film Wrapper
SAMPLE 1 7 8
SAMPLE 2 3 4
This shows that the charge generated on separation of the roll film assembly of the present invention is much less than on the standard roll film assembly.
When the separations were viewed in dark through an image intensifier system static discharges could be seen when the roll films of sample 1 were separated but not when the roll films of sample 2 were separated.
All roll films on separation were processed and the processed prints examined. On one film of sample 1 evidence was seen of damage caused by static discharge but no evidence of static discharge was seen on any of the roll films of sample 2.
EXAMPLE II
A roll film assembly was prepared as shown in the accancanying figure which is a c5os5-sectionaI view of part of the assembly.
In the figure a gelatin non-stress layer 1 comprises particles of polymethylmethacrylate as anti-block agents 2. The non-stress layer is coated with a very thin film 3 of polyethylene emulsion. Under the non-stress layer is a silver halide emulsion layer 4 which is coated on a transparent cellulose triacetate film base 5. On the reverse side of the film base is a gelatinous anti-halation layer 6 which comprises a blue dye. Coated on the anti-halation layer 6 is another gelatinous non-stress layer 7 which also comprises polymethyl-methacrylate anti-block particles 8 and is coated with a thin layer of polyethylene emulsion 9. Shown below the non-stress layer 7 (and separated therefrom for clarity) is the wrapper 11 which comprises a polyethylene layer 12 coated on printed white paper base 13.
The coating weight of each non-stress layer was 1.6 g/m2. The polyemthylmethacrylate had a particle size of from 1 to 10 p and was 2 present to the extent of 0.015 g/m m the gelatin. The polyethylene emulsion had a coating weight on the non-stress layers of O.23g/m2.
This is assembly A.
The wrapper 11 was placed in tight contact with the non-stress layer 7 and a block was placed on the roll-film assembly. The amount of force required to begin to move the filmrassembly from under the block was determined (static friction) and the amount of force required to keep the block moving was also determined (dynamic friction). Similar tests were also carried out except that the block is weighted and was left in position for two hours before ccm=encement of the test. The same static and dynamic friction tests were carried cut. This test shows how much the polyethylene layer had been locked into contact with the non-stress layer, i.e. the blocking effect.
Similar tests were carried out on film material as shown in the figure except that in one case no anti-block particles were present in either non-stress layer and the non-stress layers were not coated with a thin layer of the polyethylene emulsion (assembly B). In the other case both non-stress layers comprised anit-blocking particles but neither layer had thin polyethylene emulsion layer thereon (assembly C).
The results obtained were as follows :
The fitures shown are relative coefficients of friction.
Friction Friction Blocking Blocking
(Static) (Dynamic) (Static) (Dynamic) Assembly B 0.40 0.34 0.78 0.71
Assembly C 0.35 0.32 0.71 0.66
Assembly A 0.27 0.17 0.56 0.41 (according to the invention).
This shows that the thin polyethylene film layer reduces the friction and the blocking effect even when anti-block particles are present in the non stress layers.
Claims (8)
1. A roll film assembly which comprises on a flanged spool a roll
film wrapper which consists of a laminate of paper and
polyethylene incorporating carbon black particles, the wrapper
being helically wound on the outside of a photographic film which comprises on a film base on one side at least one colloidal
silver-halide emulsion layer and on the reverse side a gelatinous
top coat which comprises a polyethylene emulsion or a polyethylene
copolymer emulsion, this said gelatinous layer being in rolled
contact with the polyethylene side of the roll film wrapper.
2. A roll film assembly according to claim 1 which comprises one or
two gelatinous silver halide emulsion layers, an undercoat and a
top coat, and there is present on the emulsion top coat a
gelatinous non-stress layer which incorporates a polyethylene
copolymer emulsion.
3. A roll film assembly according to either claim 1 or claim 2
wherein there is present on the reverse side of the film base to
the silver halide emulsion coated side an anti-halation gelatinous
dye layer and on this layer is coated the gelatinous layer which
comprises the polyethylene emulsion as a non-stress layer.
4. A roll film wrapper according to any one of claims 1 to 3 wherein
the particle size of the polyethylene particles in the emulsion is
less than 200 nm.
5. A roll film wrapper according to any one of claims 1 to 4 wherein
the particles in the polyethylene emuslion have a melt
temperature between 80 to 140 C.
6. A roll film wrapper according to any one of claims 1 to 5 wherein
the amsunt of polyethylene emulsion as the solid polyethylene on
the gelatinous layer is from 2 to 100g per 1000g of gelatin.
7. A roll film wrapper according to any one of claims 1 to 6 wherein
a biocide is present in the polyethylene emulsion.
8. A roll film wrapper according to any one of claims 1 to 7 wherein
there is present in the gelatinous top coat anqZor in the
non-stress layer anti-block particles.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB888821426A GB8821426D0 (en) | 1988-09-13 | 1988-09-13 | Photographic film assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8920533D0 GB8920533D0 (en) | 1989-10-25 |
| GB2222700A true GB2222700A (en) | 1990-03-14 |
Family
ID=10643498
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB888821426A Pending GB8821426D0 (en) | 1988-09-13 | 1988-09-13 | Photographic film assembly |
| GB8920533A Withdrawn GB2222700A (en) | 1988-09-13 | 1989-09-11 | Photographic roll film assembly |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB888821426A Pending GB8821426D0 (en) | 1988-09-13 | 1988-09-13 | Photographic film assembly |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8821426D0 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0494414A1 (en) * | 1991-01-05 | 1992-07-15 | ILFORD Limited | Roll film assembly |
| EP0518627A1 (en) * | 1991-06-10 | 1992-12-16 | International Paper Company | Reducing silver sludging during photographic processing |
| EP0609539A2 (en) * | 1992-12-18 | 1994-08-10 | Fuji Photo Film Co., Ltd. | Photographic printing paper support |
| EP0874274A1 (en) * | 1997-04-24 | 1998-10-28 | Eastman Kodak Company | Antistatic opacifying layer for photographic roll film |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1156302A (en) * | 1965-07-07 | 1969-06-25 | Kodak Ltd | Photographic Backing Paper |
-
1988
- 1988-09-13 GB GB888821426A patent/GB8821426D0/en active Pending
-
1989
- 1989-09-11 GB GB8920533A patent/GB2222700A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1156302A (en) * | 1965-07-07 | 1969-06-25 | Kodak Ltd | Photographic Backing Paper |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0494414A1 (en) * | 1991-01-05 | 1992-07-15 | ILFORD Limited | Roll film assembly |
| US5360701A (en) * | 1991-01-05 | 1994-11-01 | Ilford Limited | Antistatic backing for photographic roll film |
| EP0518627A1 (en) * | 1991-06-10 | 1992-12-16 | International Paper Company | Reducing silver sludging during photographic processing |
| EP0609539A2 (en) * | 1992-12-18 | 1994-08-10 | Fuji Photo Film Co., Ltd. | Photographic printing paper support |
| EP0609539A3 (en) * | 1992-12-18 | 1995-08-02 | Fuji Photo Film Co Ltd | Photographic printing paper support. |
| EP0874274A1 (en) * | 1997-04-24 | 1998-10-28 | Eastman Kodak Company | Antistatic opacifying layer for photographic roll film |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8920533D0 (en) | 1989-10-25 |
| GB8821426D0 (en) | 1988-10-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |