# US 5,350,445 A · Hydrophilic coating composition and bath containing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,350,445 A - Document ID: US5350445A - Status: Granted - Kind: A - Application number: 07/896,978 - Filed: 1992-06-11 - Granted: 1994-09-27 - Earliest claimed: 1991-06-12 - Assignees: Nippon Paint Co., Ltd.; Showa Aluminum Corporation - Inventors: Fujio Mikami; Kiyotada Yasuhara; Masahiro Kojima; Susumu Inoue - Web page: https://patentgrep.com/patent/US5350445A ## CPC - C09D 129/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids - B05D 5/04: to obtain a surface receptive to ink or other liquid (B05D5/02, {B41M5/52} take precedence) - B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) - C09D 139/06: Homopolymers or copolymers of N-vinyl-pyrrolidones - B05D 2202/25: based on Al - C08L 29/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids - C08L 39/06: Homopolymers or copolymers of N-vinyl-pyrrolidones - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract The hydrophilic coating composition including, on a solid basis, (a) 0.3-6 parts by weight of polyvinyl pyrrolidone having a polymerization degree of 10-1000; and (b) 1-10 parts by weight of polyvinyl alcohol having a saponification degree of 80% or more and a polymerization degree of 100-1000, a weight ratio of the component (a) to the component (b), (a)/[(a)+(b)], being in the range of 0.1-0.9. ## Claims ### Claim 1 A hydrophilic coating composition comprising: by weight in an aqueous solution or dispersion, (a) 0.3-6 parts by weight of polyvinyl pyrrolidone having a polymerization degree of 10-1000; and (b) 1-10 parts by weight of polyvinyl alcohol having a saponification degree of 80% or more and a polymerization degree of 100-1000, a weight ratio of said component (a) to said component (b), (a)/[(a)+(b)], being in the range of 0.1-0.9. ### Claim 2 (depends on 1) The hydrophilic coating composition according to claim 1, further containing 0.3-5 parts by weight of a water-soluble nylon. ### Claim 3 (depends on 1) The hydrophilic coating composition according to claim 1, further containing 0.1-5 parts by weight of a water-soluble phenol resin. ### Claim 4 (depends on 1) The hydrophilic coating composition according to claim 1, further containing 0.1-2 parts by weight of a mildew-proofing agent containing an imidazole compound. ### Claim 5 (depends on 1) The hydrophilic coating composition according to claim 1, wherein said polyvinyl pyrrolidone consists of a first and second pyrrolidone the first pyrrolidone has a polymerization degree of 10-50 and the second pyrrolidone has a polymerization degree of 100-500, and a weight ratio of the first polyvinyl pyrrolidone to the second polyvinyl pyrrolidone is 1/1.5-1/3.0. ### Claim 6 (depends on 1) The hydrophilic coating composition according to claim 1, wherein said polyvinyl pyrrolidone has a polymerization degree of 80-600. ### Claim 7 (depends on 6) The hydrophilic coating composition according to claim 6, wherein said polyvinyl pyrrolidone has a polymerization degree of 100-360. ### Claim 8 (depends on 1) The hydrophilic coating composition according to claim 1, wherein the amount of said polyvinyl pyrrolidone is 0.5-5 parts by weight on a solid basis. ### Claim 9 (depends on 8) The hydrophilic coating composition according to claim 8, wherein the amount of said polyvinyl pyrrolidone is 0.6-4 parts by weight on a solid basis. ### Claim 10 (depends on 1) The hydrophilic coating composition according to claim 1, wherein said polyvinyl alcohol has a saponification degree of 90% or more. ### Claim 11 A hydrophilic coating bath containing a hydrophilic coating composition in a concentration of 10-200 g/l, said hydrophilic coating composition comprising, by weight in an aqueous solution or dispersion, (a) 0.3-6 parts by weight of polyvinyl pyrrolidone having a polymerization degree of 10-1000; and (b) 1-10 parts by weight of polyvinyl alcohol having a saponification degree of 80% or more and a polymerization degree of 100-1000, a weight ratio of said component (a) to said component (b), (a)/[(a)+(b)], being in the range of 0.1-0.9. ### Claim 12 (depends on 5) The hydrophilic coating composition according to claim 5, wherein the weight ratio is 1/2-1/2.5. ### Claim 13 (depends on 1) The hydrophilic coating composition according to claim 1, wherein said polyvinyl pyrrolidone consists of three or more polyvinyl pyrrolidones having different polymerization degrees. ### Claim 14 (depends on 1) The hydrophilic coating composition according to claim 1, wherein said polyvinyl alcohol has a polymerization degree of 200 to 600. ### Claim 15 (depends on 1) The hydrophilic coating composition according to claim 1, wherein said polyvinyl alcohol has a saponification degree of 90% or more. ### Claim 16 (depends on 1) The hydrophilic coating composition according to claim 1, wherein the amount of said polyvinyl alcohol is 2 to 7 parts by weight on a solid basis. ### Claim 17 (depends on 1) The hydrophilic coating composition according to claim 1, wherein said polyvinyl pyrrolidone has a polymerization degree of 80 to 600. ### Claim 18 (depends on 17) The hydrophilic coating composition according to claim 17, wherein the polymerization degree is 100-360. ### Claim 19 (depends on 1) The hydrophilic coating composition according to claim 1, wherein (a)/[(a)+(b)] is 0.2 to 0.8. ### Claim 20 (depends on 2) The hydrophilic coating composition according to claim 2, wherein the water-soluble nylon has an average polymerization degree in the range of 50 to 300. ### Claim 21 (depends on 1) The hydrophilic coating composition according to claim 1, wherein said polyvinyl pyrrolidone is present in an amount of 0.5 to 5 parts by weight. ### Claim 22 (depends on 21) The hydrophilic coating composition according to claim 21, wherein said polyvinyl pyrrolidone is present in an amount of 0.6 to 4 parts by weight. ### Claim 23 (depends on 20) The hydrophilic coating composition according to claim 20, wherein the average polymerization degree is in the range of 80 to 200. ### Claim 24 (depends on 2) The hydrophilic coating composition according to claim 2, wherein said water-soluble nylon is present in an amount of 0.5 to 3.0 parts by weight on a solid basis. ### Claim 25 (depends on 2) The hydrophilic coating composition according to claim 2, wherein the water-soluble nylon contains at least one of a hydroxyl group, an amino group, a secondary amine, a tertiary amine and an alkanol amine. ### Claim 26 (depends on 25) The hydrophilic coating composition according to claim 25, wherein the secondary amine is selected from the group consisting of aliphatic amines and aromatic amines. ### Claim 27 (depends on 26) The hydrophilic coating composition according to claim 26, wherein the aliphatic amines are selected from the group consisting of ethylenediamine, trimethylenediamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononene and 1,10-diaminodecane. ### Claim 28 (depends on 26) The hydrophilic coating composition according to claim 26, wherein the aromatic amine is selected from the group consisting of o-phenylenediamine-, m-phenylenediamine- and p-phenylenediamine. ### Claim 29 (depends on 25) The hydrophilic coating composition according to claim 25, wherein the tertiary amine is selected from the group consisting of triethylamine, tripropylamine, tributylamine and dimethylbenzylamine. ### Claim 30 (depends on 25) The hydrophilic coating composition according to claim 25, wherein the alkanol amine is selected from the group consisting of ethanolamine, diethanolamine, triethanolamine, aminoethylethanolamine and morpholine. ### Claim 31 (depends on 1) The hydrophilic coating composition according to claim 1, further containing a water-soluble amino resin in an amount of 0.1 to 5 parts by weight on a solid basis. ### Claim 32 (depends on 31) The hydrophilic coating composition according to claim 31, wherein the water-soluble amino resin is selected from the group consisting of melamine resins, iso-butylated melamine resins, benzoguanamine resins and urea resins, which are modified to have water-solubility. ### Claim 33 (depends on 32) The hydrophilic coating composition according to claim 32, wherein the melamine resins are alkoxymethylmelamines. ### Claim 34 (depends on 31) The hydrophilic coating composition according to claim 31, wherein said water-soluble amino resin is present in an amount of 0.5 to 2 parts by weight on a solid basis. ### Claim 35 (depends on 3) The hydrophilic coating composition according to claim 3, wherein the water-soluble phenol resin is selected from the group consisting of polycondensates of compounds containing phenolic hydroxy groups and aldehydes, which are modified to have water solubility. ### Claim 36 (depends on 35) The hydrophilic coating composition according to claim 35, wherein the polycondensates are selected from the group consisting of phenol, cresol, xylenol, p-alkylphenol, p-phenylphenol, chlorophenol, bisphenol A, phenol sulfonic acid and resorcinol. ### Claim 37 (depends on 35) The hydrophilic coating composition according to claim 35, wherein the aldehydes are selected from the group consisting of formalin and furfural. ### Claim 38 (depends on 36) The hydrophilic coating composition according to claim 36, wherein the water-soluble phenol resin is selected from the group consisting of phenol-formalin resins, cresol-formalin resins, phenol-furfural resins and resorcinol resins. ### Claim 39 (depends on 3) The hydrophilic coating composition according to claim 3, wherein said water-soluble phenol resin in present in an amount of 0.5 to 2 parts by weight on a solid basis. ### Claim 40 (depends on 1) The hydrophilic coating composition according to claim 1, further containing a surfactant in an amount of 1.5 parts by weight or less. ### Claim 41 (depends on 4) The hydrophilic coating composition according to claim 4, wherein said mildew-proofing agent is present in an amount of 0.2 to 1.0 parts by weight. ### Claim 42 (depends on 1) The hydrophilic coating composition according to claim 1, further containing a bactericide in an amount of 0.1 to 2 pats by weight. ### Claim 43 (depends on 42) The hydrophilic coating composition according to claim 42, wherein the bactericide is selected from the group consisting of 1,2-benzoisothiazoline-3-on, 2,3,5,6-tetrachloro-4-(methylsulfonyl)pyrridine and 10,10'-oxybisphenoxyarsine. ### Claim 44 (depends on 1) The hydrophilic coating composition according to claim 1, further containing at least one of water glass and colloidal silica in an amount sufficient to improve the hydrophilic nature of the hydrophilic coating composition without generating unpleasant odor. ### Claim 45 (depends on 44) The hydrophilic coating composition according to claim 44, wherein the water glass is selected from the group consisting of SiO.sub.2 /M.sub.2 O and SiO.sub.2 /K.sub.2 O. ### Claim 46 (depends on 44) The hydrophilic coating composition according to claim 44, wherein the colloidal silica has an average particle diameter of 10 to 50 .mu.m. ### Claim 47 (depends on 44) The hydrophilic coating composition according to claim 44, wherein the at least one of water glass and colloidal silica is present in an amount of less than 1 part by weight. ### Claim 48 (depends on 1) The hydrophilic coating composition according to claim 1, further containing a solvent in an amount of less than 7 parts by weight. ### Claim 49 (depends on 48) The hydrophilic coating composition according to claim 48, wherein the solvent is selected from the group consisting of alcohols and cellosolves. ### Claim 50 (depends on 11) The hydrophilic coating bath according to claim 11, wherein the hydrophilic coating composition is present in a concentration of 30 to 100 g/l.