US2735768A - Reduction of viscosity of packet - Google Patents

Reduction of viscosity of packet Download PDF

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US2735768A
US2735768A US2735768DA US2735768A US 2735768 A US2735768 A US 2735768A US 2735768D A US2735768D A US 2735768DA US 2735768 A US2735768 A US 2735768A
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packet
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    • 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
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
    • G03C7/388—Processes for the incorporation in the emulsion of substances liberating photographically active agents or colour-coupling substances; Solvents therefor
    • G03C7/3882—Processes for the incorporation in the emulsion of substances liberating photographically active agents or colour-coupling substances; Solvents therefor characterised by the use of a specific polymer or latex
    • 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
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/38—Dispersants; Agents facilitating spreading

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  • This invention relates to reducing the viscosity of packet photographic emulsions and the use of certain salts in connection therewith.
  • a packet emulsion was formed of three separate emulsions containing couplers corresponding to the sensitivity of the respective emulsions, which emulsions were separately mixed with aqueous solutions of the sodium salt of a copolymer of methacrylic acid and methyl methacrylate (U. S. Patent No. 2,391,181 of Minsk et al.) with aqueous solutions of water-soluble salts of styrene-maleamic acid polymer whereupon they were united and coated out on to a support. Packet emulsions are of special value in color photography.
  • the emulsion After the emulsion has been treated in the desired manner either by washing with a solution of the salt or by incorporating the salt in the emulsion, it may, after dispersing in water to the desired coating consistency, be coated onto a support therefor such as a baryta coated paper.
  • the salts which have been found to be most effective for lowering the solution viscosity of packet emulsions as referred to herein are water-soluble magnesium, barium and potassium salts such as magnesium nitrate, potassium nitrate, barium nitrate, barium chloride and potassium alum. Some of these salts not only improve the viscosity of the packet emulsion but also the keeping qualities of the emulsion are benefited.
  • That polymer may be prepared for instance by reacting together 49 parts of maleamic anhydride and 52 parts of distilled styrene in 1500 parts of dry toluene using two parts of benzoyl peroxide to catalyze the polymerization.
  • the mass thus prepared is heated for 2 /2 hours on a steam bath. Upon cooling, the mass is in a form that the solid portion thereof can be withdrawn.
  • the salt of this polymer may be obtained by adding ammonium hydroxide thereto, warming to 20-25 C. and filtering off the resulting solution of the resin salt.
  • styrene-maleamic acid polymer may be employed in preparing packet emulsions the viscosity of which may be lowered in accordance with our invention.
  • One type of polymer which has been found to be useful for packet formation is the styrene-maleic acid type such as obtained by forming an interpolymer of styrene and maleic anhydride and then treating with ammonia, a primary or secondary amine or water.
  • Other types are the styrene-acrylic anhydride and styrene-methacrylic anhydride types.
  • the water-soluble salt of the copolymer of methacrylic acid and methyl methacrylate may be prepared by treating polymers of this type described in U. S. Patent No. 2,391,181 of Minsk et' al. with a basic'compound in aqueous solution.
  • photographic emulsions containing a coupler are incorporated in solutions of each of the resins referred to, resulting in packet formation with the resins specified. This, however, has the effect of increasing the emulsion viscosities making viscosity reduction with salts in accordance with our invention highly desirable.
  • Example 1 A green sensitive silver chlorobromide emulsion was prepared containing 160 grams of gelatin per mol of silver halide and having a total weight of 2590 grams per mol of silver halide.
  • magenta coupler 1-(2,4,6 trichlorophenyl)3-[3-(2,4 ditertiary amyl phenoxy acetnmido) benzamido] -5-pyraz0lone and 34.5 grams of dioctyl hydroquinone were dissolved in 1000 ccs. of normal butyl phthalate and this solution was added to a mixture of 235 ccs. of a aqueous solution of sodium isopropyl naphthalene sulfonate and 2040 cc. of a 10% aqueous gelatin solution and was dispersed therein forming a magenta coupler dispersion.
  • the total weight of the dispersion was adjusted with distilled water to 3920 grams.
  • the mixture was held at 40 for minutes and then 150 ccs.
  • Example 2 A packet photographic emulsion was prepared as described in the preceding example which emulsion was noodled and bathed in 200 ccs. of a 10% solution of Mg(NO3)2.6H2O for 15 minutes at 44 F. The noodles were then washed in Water for 15 minutes at 47 F. The weight increased from 19.3 lbs. to 26.1 lbs. per mol of silver halide. The viscosity at 26.1 lbs. per mol of silver halide was 7 cps. and at 51.5 lbs. per mol of silver halide the viscosity of the so treated emulsion was 2.5 cps. as compared with a viscosity of 9 cps. for an emulsion at this weight which had not been so treated.
  • Example 3 A packet emulsion was prepared in the manner described in Example 1. 128 grams of an emulsion of this type was mixed with 15 ccs. of a 10% aqueous Mg(NO3)2.6I-I2O solution and 13 ccs. of water to bring the silver halide molar weight to 17.2. The viscosity of this emulsion was 21.5 cps. The emulsion was then diulted to 22.8 lbs. per mol of silver halide and the viscosity was 10 cps. A like packet emulsion to which no salt had been added showed a viscosity at 17.2 lbs. per mol of silver halide of 39 cps. and at 22.8 lbs. per mol of silver halide of 18 cps.
  • Example 4 To a packet emulsion of the type described above was added 15 ccs. of 10% aqueous KNOs and 13 ccs. of water to bring the silver halide molar weight to 17.2. The viscosity of the diluted emulsion was 28 cps. at 17.2 lbs. per mol of silver halide whereas an untreated emulsion of the same kind at this silver halide molar weight was 39 cps.
  • Example 5 To 128 grams of a packet emulsion of the same type as described above was added 15 ccs. of 10% aqueous barium nitrate and 13 ccs. of water thereby bringing the silver halide molar weight to 17.2. The viscosity was 27.5 cps. The same emulsion but without any treatment with salt exhibited a viscosity of 39 cps. at a silver halide molar weight of 17.2.
  • the coating of the emulsion thus obtained is facilitated contributing to the ease of preparing photographic products from packet emulsions of the type described herein.
  • Our invention is directed to the lowering of the viscosity of packet emulsions in which the water soluble salt of the copolymer of methacrylic acid and methyl methacrylate is employed particularly when used with the water soluble salt of a styrene-maleamic acid polymer.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Description

United States Patent REDUCTION OF VISCOSITY OF PACKET PHOTOGRAPHIC EMULSIONS John C. McFall and Henry C. Yutzy, Rochester, N. Y., assignors to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey No Drawing. Application December 16, 1952, Serial No. 326,346
8 Claims. (Cl. 95-7) This invention relates to reducing the viscosity of packet photographic emulsions and the use of certain salts in connection therewith.
The making of packet emulsions is described and claimed in U. S. application, Serial No. 156,066, now U. S. Patent No. 2,698,794 of Leopold Godowsky, filed April 15, 1950. In a method described in that application for the making of a packet emulsion a red sensitive emulsion was prepared and mixed with a cyan coupler, a green sensitive emulsion was prepared and mixed with a magenta coupler, each emulsion was separately incorporated in an aqueous solution of the sodium salt of a copolymer of methacrylic acid and methyl methacrylate following which there was then incorporated in each a water soluble salt of a packet forming polymer such as styrenemaleamic acid polymer with resultant packet formation at this point and these packet emulsions were mixed together and coated. In another method described in the Godowsky application a packet emulsion was formed of three separate emulsions containing couplers corresponding to the sensitivity of the respective emulsions, which emulsions were separately mixed with aqueous solutions of the sodium salt of a copolymer of methacrylic acid and methyl methacrylate (U. S. Patent No. 2,391,181 of Minsk et al.) with aqueous solutions of water-soluble salts of styrene-maleamic acid polymer whereupon they were united and coated out on to a support. Packet emulsions are of special value in color photography.
It has been found that with packet emulsions of the type referred to a high solution viscosity often is encountered thus presenting difliculties in coating those emulsions onto a support therefor such as baryta coated paper or film base which has been supplied with a subbing layer. In those coating operations should the emulsion be diluted to reduce its viscosity and thereby facilitate the application of the coating to the support therefor, difficulties arise both in obtaining coatings of the emulsion of the desired thickness and in the drying of the emulsion coating. It has been attempted toreduce the viscosity of emulsions of this type by a washing operation in which the emulsion is chilled, noodled and washed in cold water but in this procedure it has been found that the volume is increased to a point wherein difficulties are experienced in the coating operations.
One object of our invention is to provide a method of reducing the viscosity of packet emulsions in which copolymers of methyl methacrylate and methacrylic acid are employed in their preparation. Another object of our invention is to provide a method for reducing the viscosity of packet emulsions in which no undue increase in volume is encountered. A further object'of our invention is to prepare packet emulsions in which a small amount of magnesium nitrate or some other suitable salt has been incorporated therein. Other objects of our invention will appear herein.
We have found that when packet emulsions of the type described herein are treated with magnesium nitrate or other suitable water-soluble salts that the viscosity of n 2,735,768 Patented Feb. 21, 1956 the emulsion is appreciably lowered with no more than a slight increase in volume. We have found that this treatment of packet emulsions with salts may conveniently be accomplished in either one of two ways:
(1) Noodling the emulsion and bathing the noodles in an aqueous solution of the salt to be employed, followed by washing the emulsion with water. If desired this method may be carried out by using several successive baths containing the effective salts accompanied by decanting after each bath.
(2) Incorporating the salt which is to be used directly into the emulsion without any washing operation.
After the emulsion has been treated in the desired manner either by washing with a solution of the salt or by incorporating the salt in the emulsion, it may, after dispersing in water to the desired coating consistency, be coated onto a support therefor such as a baryta coated paper.
The salts which have been found to be most effective for lowering the solution viscosity of packet emulsions as referred to herein are water-soluble magnesium, barium and potassium salts such as magnesium nitrate, potassium nitrate, barium nitrate, barium chloride and potassium alum. Some of these salts not only improve the viscosity of the packet emulsion but also the keeping qualities of the emulsion are benefited. In the practice of our invention /z--5% of the salt based on the dry weight of both the gelatin and the resinous material present is adequate to accomplish the desired eifect and by the treatment of the packet emulsion with a salt of the type described within this range the viscosity of the emulsion is lowered to such an extent that it can be readily flowed on to a support therefor in the normal coating operation.
In the preparation of packet emulsions of the type described herein in which styrene-maleamic acid polymer is used, that polymer may be prepared for instance by reacting together 49 parts of maleamic anhydride and 52 parts of distilled styrene in 1500 parts of dry toluene using two parts of benzoyl peroxide to catalyze the polymerization. The mass thus prepared is heated for 2 /2 hours on a steam bath. Upon cooling, the mass is in a form that the solid portion thereof can be withdrawn. The salt of this polymer may be obtained by adding ammonium hydroxide thereto, warming to 20-25 C. and filtering off the resulting solution of the resin salt.
Instead of styrene-maleamic acid polymer other packet-forming polymers may be employed in preparing packet emulsions the viscosity of which may be lowered in accordance with our invention. One type of polymer which has been found to be useful for packet formation is the styrene-maleic acid type such as obtained by forming an interpolymer of styrene and maleic anhydride and then treating with ammonia, a primary or secondary amine or water. Other types are the styrene-acrylic anhydride and styrene-methacrylic anhydride types. Further disclosure as regards the polymers suitable for forming packets is contained in the Godowsky application Serial No. 156,066 referred to heretofore.
The water-soluble salt of the copolymer of methacrylic acid and methyl methacrylate may be prepared by treating polymers of this type described in U. S. Patent No. 2,391,181 of Minsk et' al. with a basic'compound in aqueous solution. In order to obtain packet emulsions of excellent characteristics photographic emulsions containing a coupler are incorporated in solutions of each of the resins referred to, resulting in packet formation with the resins specified. This, however, has the effect of increasing the emulsion viscosities making viscosity reduction with salts in accordance with our invention highly desirable.
The following examples illustrate reducing the viscosities of packet emulsions in accordance with our invention.
Example 1 A green sensitive silver chlorobromide emulsion was prepared containing 160 grams of gelatin per mol of silver halide and having a total weight of 2590 grams per mol of silver halide.
345 grams of magenta coupler 1-(2,4,6 trichlorophenyl)3-[3-(2,4 ditertiary amyl phenoxy acetnmido) benzamido] -5-pyraz0lone and 34.5 grams of dioctyl hydroquinone were dissolved in 1000 ccs. of normal butyl phthalate and this solution was added to a mixture of 235 ccs. of a aqueous solution of sodium isopropyl naphthalene sulfonate and 2040 cc. of a 10% aqueous gelatin solution and was dispersed therein forming a magenta coupler dispersion. The total weight of the dispersion was adjusted with distilled water to 3920 grams. To 9065 grams of the above silver halide emulsion there was added 462 milligrams of a green sensitizing dye, 5-[(3-ethyl-2 (3)-a-naphthoxazolylidene) ethylidene] 3 n heptyl 1 phenyl 2- thiohydantoin dissolved in 462 cc. of acetone. The mixture was held at 40 for minutes and then 150 ccs. of water plus 3920 grams of the above magenta coupler dispersion was added plus 1050 grams of a 15% aqueous solution of the sodium salt of the copolymer of methacrylic acid and methyl methacrylate. The mixture was stirred for /2 hour. There was then added to this mixture 1505 ccs. of a 5% aqueous solution of the ammonium salt of a styrene-maleamic acid polymer and the mixture was stirred for 5 minutes. At this point was added an additional 3500 ccs. of the 15 solution of the sodium salt of the copolymer of methacrylic acid and methyl methacrylate. The mixture was stirred vigorously for 45 minutes at 40 C. and packet formation occurred. There was then added 2800 ccs. of a aqueous gelatin solution plus 525 cos. of an aqueous 10% calcium acetate solution which reacts with the residual styrene-maleamic acid copolymer in the continuous phase forming the insoluble calcium salt thereof. The mixture was stirred until thoroughly mixed.
100 grams of the so formed packet emulsion were chilled and noodled. These noodles were bathed for 15 minutes in each of three successive water baths containing 1% of magnesium nitrate hexahydrate of 200 ccs. each at a temperature of 45 F., the noodles being drained between each washing. The weight of the emulsion was increased from 19.3 lbs. to lbs. per mol of silver halide and the final viscosity of 6 cps. was obtained. When the emulsion was diluted to 51.5 lbs. per mol of silver halide the viscosity thereof was 2 cps. as compared with a viscosity of 9 cps. for the emulsion not treated with magnesium nitrate at this base weight.
Example 2 A packet photographic emulsion was prepared as described in the preceding example which emulsion was noodled and bathed in 200 ccs. of a 10% solution of Mg(NO3)2.6H2O for 15 minutes at 44 F. The noodles were then washed in Water for 15 minutes at 47 F. The weight increased from 19.3 lbs. to 26.1 lbs. per mol of silver halide. The viscosity at 26.1 lbs. per mol of silver halide was 7 cps. and at 51.5 lbs. per mol of silver halide the viscosity of the so treated emulsion was 2.5 cps. as compared with a viscosity of 9 cps. for an emulsion at this weight which had not been so treated.
Example 3 A packet emulsion was prepared in the manner described in Example 1. 128 grams of an emulsion of this type was mixed with 15 ccs. of a 10% aqueous Mg(NO3)2.6I-I2O solution and 13 ccs. of water to bring the silver halide molar weight to 17.2. The viscosity of this emulsion was 21.5 cps. The emulsion was then diulted to 22.8 lbs. per mol of silver halide and the viscosity was 10 cps. A like packet emulsion to which no salt had been added showed a viscosity at 17.2 lbs. per mol of silver halide of 39 cps. and at 22.8 lbs. per mol of silver halide of 18 cps.
Example 4 To a packet emulsion of the type described above was added 15 ccs. of 10% aqueous KNOs and 13 ccs. of water to bring the silver halide molar weight to 17.2. The viscosity of the diluted emulsion was 28 cps. at 17.2 lbs. per mol of silver halide whereas an untreated emulsion of the same kind at this silver halide molar weight was 39 cps.
Example 5 To 128 grams of a packet emulsion of the same type as described above was added 15 ccs. of 10% aqueous barium nitrate and 13 ccs. of water thereby bringing the silver halide molar weight to 17.2. The viscosity was 27.5 cps. The same emulsion but without any treatment with salt exhibited a viscosity of 39 cps. at a silver halide molar weight of 17.2.
Although the examples are directed to the treatment of simple packet emulsions, it is to be understood that our invention also applies to emulsions of the mixed packet type such as are described in Examples 15 (2-color emulsion) and 16 (3-color emulsion) of U. S. application 156,066 of Leopold Godowsky, filed April 15, 1950. In treating emulsions of the mixed packet type in accordance with our invention the separate color sensitive components can each be separately treated with a viscosity reducing salt in accordance with our invention or the different color sensitive components can befirst combined to form the mixed packet emulsion and the resulting product may be treated with viscosity reducing salt in accordance with our invention. By thus incorporating the viscosity reducing salt therein the coating of the emulsion thus obtained is facilitated contributing to the ease of preparing photographic products from packet emulsions of the type described herein. Our invention is directed to the lowering of the viscosity of packet emulsions in which the water soluble salt of the copolymer of methacrylic acid and methyl methacrylate is employed particularly when used with the water soluble salt of a styrene-maleamic acid polymer.
It was found that the emulsions of the packet type which had been treated with a magnesium, barium or potassium salt as described herein are readily amenable to coating out onto a support therefor in a conventional coating operation, said coating operation being carried out at high speed and the resulting paper obtained having thereon a uniform coating of satisfactory thickness in ,contrast to the results obtained upon coating mixed packet emulsions of like nature and having a similar molar weight.
We claim:
1. A method for lowering the viscosity of a packet gelatin-silver halide photographic emulsion containing therein a methacrylic acid-methyl methacrylate polymer and a packet forming polymer selected from the group consisting of the styrene-maleamic acid packet forming polymers, the styrene-maleic anhydride packet forming polymers, the styrene-acrylic anhydride packet forming polymers and the styrene-methacrylic anhydride packet forming polymers which comprises adding to the packet emulsion /z5%, based on the dry weight of gelatin and polymer, of a water-soluble salt selected from the group consisting of the water-soluble inorganic acid salts of magnesium, potassium and barium.
2. A method for lowering the viscosity of a packet gelatin-silver halide photographic emulsion containing therein a methacrylic acid-methyl methacrylate polymer and a packet forming polymer selected from the group consisting of the styrene-maleamic acid packet forming polymers, the styrene-maleic anhydride packet forming polymers, the styrene-acrylic anhydride packet forming polymers and the styrene-methacrylic anhydride packet forming polymers which comprises bathing the packet emulsion in solid form with an aqueous solution of a water-soluble salt selected from the group consisting of the water-soluble inorganic acid salts of magnesium, potassium and barium whereby /25% of the salt, based on the dry weight of gelatin and polymer, is imparted to the emulsion.
3. A method for lowering the viscosity of a packet gelatin-silver halide photographic emulsion containing therein a methacrylic acid-methyl methacrylate polymer and a packet forming polymer selected from the group consisting of the styrene-maleamic acid packet forming polymers, the styrene-maleic anhydride packet forming polymers, the styrene-acrylic anhydride packet forming polymers and the styrene-methacrylic anhydride packet forming polymers which comprises adding to the packet emulsion /2-5% of magnesium nitrate, based on the dry weight of gelatin and polymer.
4. A method for lowering the viscosity of a packet gelatin-silver halide photographic emulsion containing therein a methacrylic acid-methyl methacrylate polymer and a packet forming polymer selected from the group consisting of the styrene-maleamic acid packet forming polymers, the styrene-maleic anhydride packet forming polymers, the styrene-acrylic anhydride packet forming polymers and the styrene-methacrylic anhydride packet forming polymers which comprises adding to the packet emulsion /z5% of potassium nitrate, based on the dry weight of gelatin and polymer.
5. A method for lowering the viscosity of a packet gelatin-silver halide photographic emulsion containing therein a methacrylic acid-methyl methacrylate polymer and a packet forming polymer selected from the group consisting of the styrene-maleamic acid packet forming polymers, the styrene-maleic anhydride packet forming polymers, the styrene-acrylic anhydride packet forming polymers and the styrene-methacrylic anhydride packet forming polymers which comprises adding to the packet emulsion /2-5% of barium nitrate, based on the dry weight of gelatin and polymer.
6. A method for lowering the viscosity of a packet gelatin-silver halide photographic emulsion containing therein a methacrylic acid-methyl methacrylate polymer and a packet forming polymer selected from the group consisting of the styrene-maleamic acid packet forming polymers, the styrene-maleic anhydride packet forming polymers, the styrene-acrylic anhydride packet forming polymers and the styrene-methacrylic anhydride packet forming polymers which comprises adding to the packet emulsion /2--5% of barium chloride, based on the dry weight of gelatin and polymer.
7. A method for lowering the viscosity of a packet gelatin-silver halide photographic emulsion containing therein a methacrylic acid-methyl methacrylate polymer and a packet forming polymer selected from the group consisting of the styrene-maleamic acid packet forming polymers, the styrene-maleic anhydride packet forming polymers, the styrene-acrylic anhydride packet forming polymers and the styrene-methacrylic anhydride packet forming polymers which comprises adding to the packet emulsion /25% of potassium alum, based on the dry weight of gelatin and polymer.
8. A method for lowering the viscosity of a packet gelatin-silver halide photographic emulsion containing therein a methacrylic acid-methyl methacrylate polymer and a packet forming polymer selected from the group consisting of the styrene-maleamic acid packet forming polymers, the styrene-maleic anhydride packet forming polymers, the styrene-acrylic anhydride packet forming polymers and the styrene-methacrylic anhydride packet forming polymers which comprises wetting said emulsion in solid form with an aqueous solution of magnesium nitrate so that /25% of magnesium nitrate, based on the dry weight of gelatin and polymer, is imparted to the emulsion.
References Cited in the file of this patent UNITED STATES PATENTS 2,565,418 Yackel Aug. 21, 1951 2,607,683 Yackel et al. Aug. 19, 1952 2,632,704 Lowe et a1. Mar. 24, 1953

Claims (1)

1. A METHOD FOR LOWERING THE VISCOSITY OF A PACKET GELATIN-SILVER HALIDE PHOTOGRAPHIC EMULSION CONTAINING THEREIN A METHACRYLIC ACID-METHYL METHACRYLATE POLYMER AND A PACKET FORMING POLYMER SELECTED FROM THE GROUP CONSISTING OF THE STYRENE-MELEAMIC ACID PACKET FORMING POLYMERS, THE STYRENE-MALEIC ANHYDRIDE PACKET FORMING POLYMERS, THE STYRENE-METHACRYLIC ANHYDRIDE PACKET FORMING POLYMERS AND THE STYRENE-METHACRYLIC ANHYDRIDE PACKET FORMING POLYMERS WHICH COMPRISES ADDING TO THE PACKET EMULSION 1/2-5%, BASED ON THE DRY WEIGHT OF GELATIN AND POLYMEMR, OF A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF THE WATER-SOLUBLE INORGANIC ACID SALTS OF MAGNESIUM, POTASSIUM AND BARIUM.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2996405A (en) * 1956-07-05 1961-08-15 Eastman Kodak Co Method of quick-setting proteincontaining coatings
US3000740A (en) * 1955-10-01 1961-09-19 Gevaert Photo Prod Nv Photographic material

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565418A (en) * 1947-08-13 1951-08-21 Eastman Kodak Co Method of preparing photographic silver halide emulsions
US2607683A (en) * 1948-07-17 1952-08-19 Eastman Kodak Co Method of making a hydrolyzed cellulose ester printing plate
US2632704A (en) * 1950-03-31 1953-03-24 Eastman Kodak Co Method of preparing silver-halide dispersions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565418A (en) * 1947-08-13 1951-08-21 Eastman Kodak Co Method of preparing photographic silver halide emulsions
US2607683A (en) * 1948-07-17 1952-08-19 Eastman Kodak Co Method of making a hydrolyzed cellulose ester printing plate
US2632704A (en) * 1950-03-31 1953-03-24 Eastman Kodak Co Method of preparing silver-halide dispersions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000740A (en) * 1955-10-01 1961-09-19 Gevaert Photo Prod Nv Photographic material
US2996405A (en) * 1956-07-05 1961-08-15 Eastman Kodak Co Method of quick-setting proteincontaining coatings

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