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Patent US4582784 - Containing both hydrophobic and hydrophilic binder - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA photographic light-sensitive material comprising at least one light-sensitive photographic emulsion layer on a support and a back layer provided on the reverse side of the support, wherein the uppermost surface layer of the back layer comprises a hydrophobic polymer binder and a hydrophilic polymer...http://www.google.com/patents/US4582784?utm_source=gb-gplus-sharePatent US4582784 - Containing both hydrophobic and hydrophilic binderAdvanced Patent SearchPublication numberUS4582784 APublication typeGrantApplication numberUS 06/662,102Publication dateApr 15, 1986Filing dateOct 18, 1984Priority dateOct 19, 1983Fee statusPaidPublication number06662102, 662102, US 4582784 A, US 4582784A, US-A-4582784, US4582784 A, US4582784AInventorsMasafumi Fukugawa, Shinzi Kataoka, Yukio Shinagawa, Itsuo FujiwaraOriginal AssigneeFuji Photo Film Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (10), Referenced by (10), Classifications (7), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetContaining both hydrophobic and hydrophilic binderUS 4582784 AAbstract A photographic light-sensitive material comprising at least one light-sensitive photographic emulsion layer on a support and a back layer provided on the reverse side of the support, wherein the uppermost surface layer of the back layer comprises a hydrophobic polymer binder and a hydrophilic polymer binder.
What is claimed is: 1. A photographic light-sensitive element comprising at least one light-sensitive photographic emulsion layer on a support and a back layer provided on the reverse side of the support, wherein a layer comprising a hydrophilic polymer is present between the uppermost surface layer of said back layer and the support, wherein the uppermost surface layer of said back layer comprises a hydrophobic polymer and 5 to 80% by weight of a hydrophilic polymer based on the weight of the total polymers which are employed in a total amount of 0.01 to 2 g per m2, wherein said hydrophobic polymer is selected from the group consisting of cellulose diacetate, cellulose triacetate, cellulose acetate butyrate and cellulose propionate and wherein said hydrophilic polymer is selected from the group consisting of copolymers and homopolymers of alkyl acrylates, alkyl methacrylates, acrylic acid, methacrylic acid, sulfoalkyl acrylates, sulfoalkyl methacrylates, glycidyl acrylate, glycidyl methacrylate, hydroxyalkyl acrylates, hydroxyalkyl methacrylates, alkoxyalkyl acrylates, alkoxyalkyl methacrylates, styrene, butadiene, maleic anhydride and itaconic anhydride.
FIELD OF THE INVENTION The present invention relates to photographic light-sensitive materials having improved anti-adhesive properties and improvements in uneven drying. Particularly, the present invention relates to photographic light-sensitive materials wherein uneven drying is improved by improving the wetting property of the back layer to water.
BACKGROUND OF THE INVENTION Photographic light-sensitive materials are generally composed of light-sensitive photographic emulsion layers and, if necessary, light-insensitive layers such as an interlayer, an emulsion protective layer, a filter layer, an anti-static layer or an anti-halation layer, applied to one side or both sides of a support consisting of an α-olefin such as polyethylene or polystyrene, a cellulose ester such as cellulose acetate or nitrocellulose, a polyester such as polyethylene terephthalate, paper, a synthetic paper or a sheet prepared by coating both sides of paper with the above described materials, directly or indirectly through a subbing layer.
SUMMARY OF THE INVENTION An object of the present invention is to provide photographic light-sensitive materials wherein drying unevenness is prevented.
DETAILED DESCRIPTION OF THE INVENTION As the hydrophobic polymer binders used in the uppermost surface layer of the back layer in the present invention, there are cellulose diacetate, cellulose triacetate, cellulose acetate butyrate and cellulose propionate, all of which are excellent in anti-adhesive properties and anti-scratching properties and excellent in compatibility with the hydrophilic polymers. Particularly, cellulose diacetate and cellulose triacetate are excellent to use.
EXAMPLE 1 Coating solutions for a back layer having compositions I, II and III shown in Table 1 were applied to cellulose triacetate film supports so as to be 50 g/m2 and dried at 90� C. for 3 minutes to form a back layer. Thus, films I, II and III having a back layer were obtained.
TABLE 1______________________________________      Coating solution for back layer      I        II        III______________________________________Cellulose diacetate         0.5 part   0.5 part --Finely divided        0.05 part  0.05 part 0.05 partgranular silica(particle size:less than 1&#956;)Acetone        100 parts                     100 parts                               100 partsCellulose acetyl        --         0.15 part  0.5 partphthalate______________________________________
On the reverse side of the back layer of the films I, II and III, a silver halide emulsion layer containing 4 g/m2 of gelatin and 5 g/m2 of silver iodobromide (iodine content: 2% by mol) and a protective layer containing 1 g/m2 of gelatin were provided to produce indirect X-ray films I, II and III. The X-ray films I, II and III were processed with a developing solution: RD - 3 (produced by Fuji Photo Film Co., Ltd.) and a fixing solution: Fuji - F (produced by Fuji Photo Film Co., Ltd.) for the whole processing time of 90 seconds by means of an automatic developing apparatus: RU - II (produced by Fuji Photo Film Co., Ltd.). The drying temperature was 35� C.
In order to examine the anti-adhesive property, the X-ray films which were not processed were cut in a size of 35 mm�35 mm. After being allowed to stand in an atmosphere at 25� C. and 80% RH for 24 hours, 5 sets of 2 sheets were piled up and allowed to stand under a load of 2 kg in the same atmosphere as described above for 24 hours. Thereafter, they were taken out, the films were separated, and the adhesion area between the back layer and the protective layer was examined. The case that the adhesion area was 0 to 5% was evaluated as A, the case of 6 to 10% was evaluated as B, the case of 11 to 20% was evaluated as C, the case of 21 to 30% was evaluated as D, and the case of 31% or more was evaluated as E. The results of the evaluation of adhesion are shown in Table 2.
EXAMPLE 2 A coating solution for the back layer prepared by dissolving 8 g of the following ionen type polymer having a molecular weight of 10,000 in 10 ml of water and diluting with a mixed solvent composed of 650 ml of methanol and 350 ml of acetone was applied to a cellulose triacetate film support so as to be 50 mg/m2, and dried at 100� C. for 3 minutes to form a back layer.
To the resulting layer, back coating solution IV, V or VI shown in Table 3 was employed for the uppermost surface layer and was applied so as to be 30 g/m2 and dried at 90� C. for 3 minutes to form an uppermost surface layer of the back layer. Thus, films IV, V and VI having a back layer were obtained.
TABLE 3______________________________________(Ionen type polymer) ##STR1##       Back coating solution of       uppermost surface layer       IV      V        VI______________________________________Cellulose diacetate         0.5 part  0.5 part --Finely divided         0.05 part 0.05     0.05 partgranular silica(particle size:less than 1&#956;)Acetone       80 parts  80 parts 80 partsMethanol      20 parts  20 parts 20 partsMethyl methacry-         --        0.1 part 0.5 partlate-methacrylicacid copolymer(85:15, % by mol)______________________________________
In order to examine the anti-static ability, X-ray films IV, V and VI which were not processed were allowed to stand in an atmosphere at 25� C. and 30% RH for 24 hours. Thereafter, a rubber roll was rolled on the surface of the light-sensitive layer side to generate static electricity. After development processing was carried out with the same automatic development apparatus described in Example 1, static marks were examined. The results are shown in Table 4.
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