# US 5,702,809 A · Composition for an antistatic layer and a film comprising this layer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,702,809 A - Document ID: US5702809A - Status: Granted - Kind: A - Application number: 08/661,235 - Filed: 1996-06-10 - Granted: 1997-12-30 - Earliest claimed: 1995-06-12 - Assignees: Eastman Kodak Company - Inventors: Jean-Pierre Tixier; Annie Francoise Armande Legrand - Web page: https://patentgrep.com/patent/US5702809A ## CPC - C09K 3/16: Anti-static materials - G03C 1/85: characterised by antistatic additives or coatings - G03C 1/93: Macromolecular substances therefor - G03C 1/32: Matting agents {(see also G03C1/95)} - G03C 1/853: {Inorganic compounds, e.g. metals} - G03C 1/89: Macromolecular substances therefor - Y10S 428/922: Static electricity metal bleed-off metallic stock - Y10S 524/91: Antistatic compositions - Y10T 428/24967: Absolute thicknesses specified - Y10T 428/24975: No layer or component greater than 5 mils thick - Y10T 428/265: 1 mil or less - Y10T 428/31576: Ester monomer type [polyvinylacetate, etc.] - Y10T 428/3158: Halide monomer type [polyvinyl chloride, etc.] - Y10T 428/31583: Nitrile monomer type [polyacrylonitrile, etc.] - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The aqueous composition for antistatic layer according to the invention comprises vanadium pentoxide and a polyurethane which includes no sulfonated groups and which is stable in an acidic medium, the weight ratio of vanadium pentoxide to polyurethane preferably being between 1:200 and 5:1. Polymeric supports coated with such a composition can be used for transparencies for photocopy, for mounting supports in the field of printing, or in photographic or magnetic products and in packaging. ## Claims ### Claim 1 Aqueous composition for an antistatic layer comprising vanadium pentoxide and an aqueous dispersion of a polyurethane characterized in that the polyurethane includes no sulfonated groups and is resistant to flocculation in an acidic medium. ### Claim 2 (depends on 1) Aqueous composition according to claim 1 wherein the amount of vanadium pentoxide in the aqueous composition is less than 3% by weight based on the total dry weight of the composition and the weight ratio of vanadium pentoxide to polyurethane is between 1:200 and 5:1. ### Claim 3 (depends on 2) Aqueous composition according to claim 2 wherein the amount of vanadium pentoxide in the antistatic composition is less than 1% by weight based on the total dry weight of the composition and the weight ratio of vanadium pentoxide to polyurethane is between 1:10 and 1:1. ### Claim 4 (depends on 1) Aqueous composition according to claim 1 comprising between 0.010 and 0.100% vanadium pentoxide and between 0.025 and 0.300% of a polyurethane including no sulfonated groups and resistant to flocculation in an acidic medium, the percentages being by weight based on the total dry weight of the composition. ### Claim 5 (depends on 4) Aqueous composition according to claim 4, further containing between 0.001 and 0.200% wax, the percentages being by weight based on the total dry weight of the composition. ### Claim 6 (depends on 4) Aqueous composition according to claim 4, further containing between 0.001 and 0.020% matting agent, the percentages being by weight based on the total dry weight of the composition. ### Claim 7 (depends on 1) Aqueous composition according to claim 1, wherein the vanadium pentoxide is in the form of a colloidal solution. ### Claim 8 (depends on 1) Aqueous composition according to claim 1, wherein the polyurethane is a polyurethane comprising hexamethylene diisocyanate ester recurring units. ### Claim 9 (depends on 8) Aqueous composition according to claim 8, wherein the polyurethane is used in the form of an anionic aqueous dispersion. ### Claim 10 (depends on 5) Aqueous composition according to claim 5, wherein the wax is Carnauba wax. ### Claim 11 (depends on 6) Aqueous composition according to claim 6, wherein the matting agent is polymethylmethacrylate beads, silica in powder form, or silica in colloidal form. ### Claim 12 (depends on 1) Method for obtaining a light-transmitting transparent antistatic abrasion-resistant film comprising 1) applying a subbing layer on a light-transmitting polymeric support, 2) coating the subbing layer obtained in 1) with the aqueous composition according to claim 1, and 3) drying the coated aqueous composition. ### Claim 13 (depends on 1) Antistatic film comprising a polymeric support, a subbing layer, and an antistatic layer, wherein the antistatic layer is formed by coating the aqueous composition according to claim 1 on the subbing layer and drying the coated aqueous composition. ### Claim 14 (depends on 13) Antistatic film according to claim 13, wherein the subbing layer is formed by coating a dispersion comprising a polymer latex and resorcinol on the polymeric support. ### Claim 15 (depends on 14) Antistatic film according to claim 14, wherein the subbing layer polymer latex is a terpolymer latex of acrylonitrile, vinylidene chloride and acrylic acid. ### Claim 16 (depends on 13) Antistatic film according to claim 13, wherein the thickness of the antistatic layer is less than 5 .mu.m. ### Claim 17 (depends on 13) Antistatic film according to claim 13, wherein the thickness of the antistatic layer is between 0.001 and 0.05 .mu.m. ### Claim 18 (depends on 17) Antistatic film according to claim 17, wherein the thickness of the antistatic layer is between 0.005 and 0.05 .mu.m, and the thickness of the subbing layer is between 0.02 and 0.20 .mu.m. ### Claim 19 (depends on 13) Antistatic film according to claim 13, wherein the weight ratio of vanadium pentoxide to polyurethane in the coated antistatic layer is between 1:200 and 5:1. ### Claim 20 (depends on 19) Antistatic film according to claim 19, wherein the weight ratio of vanadium pentoxide to polyurethane is between 1:10 and 1:1.