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AssigneeFuji Photo Film Co., Ltd.
InventorsTakushi Miyazako, Shigeru Nagatomo
Estimating the term…
A photographic photosensitive element containing copolymers comprising (a) 30 to 70 mole % of the recurring unit represented by the formula (I) ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl group; and (b) 70 to 30 mole % of the recurring unit represented by the formula (II) ##STR2## wherein R.sub.2 is a hydrogen atom or a methyl group and M is selected from the group consisting of hydrogen, lithium, sodium, potassium and NH.sub.4 ; in the most upper layer of the element, suitable for processing at temperatures of at least about 27.degree. C. to form an image.
A photographic photosensitive element containing at least one silver halide emulsion layer and as the uppermost layer thereof a protective layer containing about 10 to about 70% by weight of a copolymer consisting of
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
With macromolecular additives; with layer-forming substances: polymers obtained by reactions involving only carbon-to-carbon unsaturated bonds,…
Photosensitive materials: photosensitive materials characterised by the base or auxiliary layers
Radiation imagery chemistry: process, composition, or product thereof: protective or antiabrasion layer
Photosensitive materials for photographic purposes
Term ended 4 Nov 1997 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to a photographic photosensitive element and a method for forming an image using the same. More particularly, it relates to a photographic photosensitive element capable of being rapidly processed at high temperatures of at least 27.degree. C. without the formation of reticulation and to a method for forming images using the same.
2. Description of the Prior Art
The present invention is further illustrated in greater detail by reference to the following examples. Unless otherwise indicated, all parts, percents, ratios and the like are by weight.
A reaction vessel was charged with 43 g (0.5 mole) of methacrylic acid, 52 g (0.5 mole) of styrene, 150 ml of ethanol and 0.45 g of benzoyl peroxide as a polymerization initiator. After purging the system with nitrogen, the mixture was stirred at 70.degree. to 80.degree. C. for 5 hours. Then, the reaction product was reprecipitated in water and vacuum-dried until a constant weight was reached. Thus, Copolymer-1 was obtained. The yield was 69.3 g (73.0%). The product was neutralized with sodium hydroxide to adjust the pH of a 20% aqueous solution to 7.5. The viscosity was 0.73 (.eta. sp/c.c=0.1%, 30.degree. C.).
The same procedure was repeated to produce Copolymer-2 and Copolymer-3 using the monomers and proportions as indicated in the following table.