Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Reexamination Certificate
1999-12-17
2003-01-07
Baxter, Janet (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
C430S271100, C430S286100, C430S287100, C430S288100, C430S302000, C430S303000
Reexamination Certificate
active
06503691
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to polymeric compositions, particularly thermally sensitive polymeric mixtures with metal compounds that are also polymerizably sensitive, more particularly with thermosensitive compositions and elements comprising at least one layer of the thermosensitive composition that is capable of being imaged by a laser for lithographic printing, the resulting printable image showing printing durability and not requiring a wash-off processing step.
2. Background of the Art
The art of lithographic printing is based on the immiscibility of oil and water, wherein the oily material or ink is preferentially retained by the image area of a printing plate and the water or fountain solution retained by the non-image area. Commonly the ink is transferred to an intermediate material called a blanket which in turn transfers the material the ink to the surface of the material upon which the image is to be reproduced. A widely used type of lithographic printing plate has a light (UV) sensitive coating applied to an aluminum base support. The coating may respond to the light by having the portion that is exposed becoming soluble and removed by a subsequent development process. Such a plate is said to be a positive working plate. Conversely, when the area that is exposed becomes hardened or polymerized the plate is referred to as a negative working plate. In both instances the image areas are ink-receptive or oleophilic. The background or hydrophilic area is typically aluminum which has been grained and anodized to provide a hydrophilic surface.
Direct digital imaging of offset printing plates (computer to plate CTP) is a technology that has assumed importance to the printing industry. In the use of this plate material, graphic information made by computer typesetting and desktop publishing is directly printed onto a plate by using a laser without an intermediate transfer material (film). The CTP process enables the rationalization and shortening of the plate making process as well as a reduction in material costs. Advances in solid state laser technology have made high powered diode lasers emitting energy at about 830 nm attractive light sources for carrying out this direct process. At least two printing technologies have been introduced which that can be imaged with laser. Plates are commercially sold by Kodak Polychrome Graphics which can be imaged in this way. These materials require a development step to produce the final image. Further printing technologies are described in EP-A-0 573 091 (Agfa) and several patents assigned to Presstek U.S. Pat. Nos. 5,353,705 and 5,379,698. This technology does not require a development step but instead relies on ablation to physically remove the imaging layer from the plate. Ablation requires high laser energy and power, resulting in low throughput and problems with debris after imaging.
Direct digital imaging without the use of a development step has been disclosed in U.S. Pat. No. 5,569,573 as a thermosensitive lithographic printing original plate comprising a substrate, a hydrophilic layer containing a hydrophilic binder polymer, and a microcapsuled oleophilic material which forms an image area by heating; the hydrophilic binder polymer having a three-dimensional cross-link and a functional group which chemically combines with the oleophilic material in the microcapsule when the microcapsule is decomposed, and the microcapsuled oleophilic material having a functional group which chemically combines with the hydrophilic binder polymer when the microcapsule is decomposed. The thermosensitive lithographic printing original plate is excellent in printing durability and storage property and provides prints having clear images because the plate does not collect scumming. Further, development is not required in the plate making process so that there are no problems with waste treatment and the like. Consequently, the original plate can be practically applied not only to a light printing such as a printing in offices but also to a rotary press of newspaper, form printing and the like.
Sulfamides have found utility in photosensitive media primarily as peripheral addenda, rather than as active ingredients in the photosensitive process. For example, U.S. Pat. No. 5,360,700 teaches the class of sulfamides as antifungal agents in silver halide solutions. This patent asserts that for the improved liquid preservability, it is preferable to add an antifungal agent to the stabilizing solution which is used instead of water washing and the stabilizing of the present invention. The antifungal agents which can be preferably used are salicylic acid, sorbic acid, dehydroacetic acid, hydroxybenzoic acid compounds, alkylphenol compounds, thiazole compounds, pyridine compounds, guanidine compounds, carbamate compounds, morpholine compounds, quaternary phosphonium compounds, ammonium compounds, urea compounds, isoxazole compounds, propanolamine compounds, sulfamide derivatives and amino acid compounds . . . The sulfamide derivatives include fluorinated sulfamide, 4-chloro-3,5-dinitrobenzenesulfamide, sulfanylamide, acetosulfamine, sulfapyridine, sulfaguanidine, sulfathiazole, sulfadiazine, sulfamerazine, sulfamethazine, sulfaisoxazole, homosulfamine, sulfisomidine, sulfaguanidine, sulfamethizole, sulfapyradine, phthalisosulfathiazole and succinylsulfathiazole.
Similarly, U.S. Pat. No. 4,765,973 teaches the use of anti-infectives, such as antibiotics, including penicillin, tetracycline, chlortetracycline bacitracin, nystatin, streptomycin, neomycin, polymyxin, gramicidin, oxytetracycline, chloramphenicol, and erythromycin; sulfonamides, including sulfacetamide, sulfamethizole, sulfamethazine, sulfadiazine, sulfamerazine, and sulfisoxazole, cefoxitin; anti-virals including idoxuridine; and other anti-infectives including nitrofurazone and sodium propionate in a polymer matrix to be provided for therapeutic treatment.
U.S. Pat. No. 4,020,150 teaches the oral administration of silver sulfadiazine or silver sulfamerazine and radioactive derivatives thereof in the treatment of malignant tumors, either by oral or subcutaneous administration.
U.S. Pat. No. 3,761,590, there is disclosed the fact that silver sulfadiazine and silver sulfadiazine-containing compositions of materials, particularly silver sulfadiazine dispersed in water-dispersible hydrophilic carrier or ointment are especially useful in burn therapy. Broadly, silver sulfadiazine when employed in the treatment of infections in man and animals exhibits anti-bacterial properties, antifungal properties and anti-protozoal properties, e.g., useful in the treatment of trichomonas vaginitis and also exhibits spermicidal activity.
U.S. Pat. Nos. 5,648,399; 5,639,795; and 5,438,076 teach liquid polymer compositions which may contain antimicrobial agents such as silver sulfadiazine, particularly for the treatment of gingivitis.
U.S. Pat. No. 5,622,168 teaches the use of a highly conductive hydrophilic gel comprising a uniform aqueous solution of a crosslinked water-soluble polymer, an amount of a water-soluble electrolyte effective to reduce the transverse electrical resistance of said aqueous mixture to an impedance at 60 Hz less than about 1,000 ohm, which hydrophilic gel also contains a humectant in an amount effective to retard the drying of the conductive hydrophilic gel when it is exposed to the atmosphere while being used. A physiological electrode adapted for providing electrical contact with a surface of a sentient creature and comprising a sheet of the conductive viscoelastic hydrophilic gel. Silver sulfadiazine is again added as an antimicrobial agent.
U.S. Pat. No. 4,376,764 also teaches the use of silver sulfadiazine as an antimicrobial agent in the use of silver ion gel compositions containing a polyoxybutylene-polyoxyethylene block copolymer that maintain their gel characteristics at temperatures below 20 degrees C. These gel compositions may be used to treat burn wounds and superficial ulcers.
In fact, applicants are unaware of the use of s
Bjork Jon Alfred
Goodin Jonathan William
Memetea Livia Tatiana
Morgan David A.
Yu Yisong
Baxter Janet
Creo SRL
Lee Sin J.
Mark A. Litman & Assoc. P.A.
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