# US 5,707,704 A · Masking films > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,704 A - Document ID: US5707704A - Status: Granted - Kind: A - Application number: 08/577,003 - Filed: 1995-12-26 - Granted: 1998-01-13 - Earliest claimed: 1994-12-27 - Assignees: Kimoto Co., Ltd. - Inventors: Satoshi Ako; Kan Hashizume; Takashi Shimizu - Web page: https://patentgrep.com/patent/US5707704A ## CPC - G03F 1/68: Preparation processes not covered by groups G03F1/20 - G03F1/50 - Y10T 428/14: Layer or component removable to expose adhesive - Y10T 428/1433: Coloring agent containing - Y10T 428/31786: Of polyester [e.g., alkyd, etc.] - Y10T 428/31935: Ester, halide or nitrile of addition polymer - G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A masking film comprising a light-shielding peelable layer provided on a transparent support wherein a binder component of the light-shielding peelable layer comprises 20 to 40% by weight of a rubberlike resin, 25 to 75% by weight of a vinyl chloride resin and 5 to 35% by weight of a thermoplastic resin containing OH groups compatible with the rubberlike resin and the vinyl chloride resin based on total resin components, which maintains anti-blocking property and appropriate adhesion after a long period of time. ## Claims ### Claim 1 A masking film having long-life adhesiveness and a good anti-blocking property, said masking film comprising a light-shielding peelable layer provided on a transparent support wherein said peelable layer includes a binder component which comprises: 20 to 40% by weight of a rubber-like resin, 25 to 75% by weight of a vinyl chloride resin and 5 to 35% by weight of a thermoplastic resin containing OH groups compatible with the rubberlike resin and the vinyl chloride resin, based on total resin components, said thermoplastic resin containing OH groups being selected from the group consisting of phenoxy resins, epoxy resins, polyvinyl acetals, vinyl chloride/vinyl acetate/vinyl alcohol terpolymers and styrene/maleic acid half esters. ### Claim 2 (depends on 1) The masking film of claim 1 wherein said binder component of the light-shielding peelable layer comprises 25 to 35% by weight of said rubberlike resin, 35 to 65% by weight of said vinyl chloride resin and 5 to 30% by weight of said thermoplastic resin containing OR groups compatible with the rubberlike resin and the vinyl chloride resin, based on total resin components. ### Claim 3 (depends on 1) The masking film of claim 1 wherein the rubberlike resin is selected from the group consisting of nitrile rubbers, acrylic rubbers, urethane rubbers, butadiene rubbers, isoprene rubbers, styrene/butadiene rubbers, carboxyl group-containing nitrile rubbers, butyl rubbers, ethylene/vinyl acetate rubbers, ethylene/acrylic resin rubbers, chlorinated polyethylenes and chlorosulfonated polyethylenes. ### Claim 4 (depends on 3) The masking film of claim 3 wherein the rubberlike resin is selected from the group consisting of nitrile rubbers. ### Claim 5 (depends on 1) The masking film of claim 1 wherein the vinyl chloride resin is selected from the group consisting of vinyl chloride/vinyl acetate copolymers, vinyl chloride/acrylic acid copolymers, vinyl chloride/acrylic ester copolymers, vinyl chloride/vinylidene chloride copolymers and chlorinated vinyl chloride resins. ### Claim 6 (depends on 1) The masking film of claim 1 wherein the thermoplastic resin containing OH groups is selected from the group consisting of phenoxy resins, epoxy resins, acrylic resins, polyvinyl acetals, vinyl chloride/acrylic ester copolymers, vinyl chloride/vinyl acetate/vinyl alcohol copolymers, styrene/maleic acid half esters and cellulose resins. ### Claim 7 (depends on 1) The masking film of claim 1 wherein the light-shielding peelable layer has a thickness of from 10 to 50 .mu.m. ### Claim 8 (depends on 7) The masking film of claim 7 wherein the light-shielding peelable layer has a thickness of from 15 to 45 .mu.m. ### Claim 9 (depends on 1) The masking film of claim 1 wherein the transparent support is a plastic film composed of a material selected from the group consisting of polyesters, polycarbonates, triacetylcelluloses, polyvinyl chlorides, acrylic resins, polystyrenes, polyamides, polyimides, polyethylenes and polypropylenes. ### Claim 10 (depends on 9) The masking film of claim 9 wherein the transparent support is a biaxially oriented polyester film. ### Claim 11 (depends on 1) The masking film of claim 1 wherein the transparent support has a thickness of from 25 to 250 .mu.m. ### Claim 12 A masking film having long-life adhesiveness and a good anti-blocking property, said masking film comprising a light-shielding peelable layer provided on a transparent support wherein said peelable layer includes a binder component which comprises 20 to 40% by weight of a rubber-like resin, 25 to 75% by weight of a vinyl chloride resin and 5 to 35% by weight of a vinyl chloride/vinyl acetate/vinyl alcohol terpolymer compatible with the rubberlike resin and vinyl chloride resin, based on total resin components. ### Claim 13 (depends on 12) The masking film of claim 12 wherein the rubberlike resin is selected from the group consisting of nitrile rubbers, acrylic rubbers, urethane rubbers, butadiene rubbers, isoprene rubbers, styrene/butadiene rubbers, carboxyl group-containing nitrile rubbers, butyl rubbers, ethylene/vinyl acetate rubbers, ethylene/acrylic resin rubbres, chlorinated polyethylenes and chlorosulfonated polyethylenes and wherein said vinyl chloride resin is a vinyl chloride/vinyl acetate copolymer.