# US 5,330,824 A · Image protecting film and image protecting method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,330,824 A - Document ID: US5330824A - Status: Granted - Kind: A - Application number: 07/951,325 - Filed: 1992-09-25 - Granted: 1994-07-19 - Earliest claimed: 1989-07-04 - Assignees: Mitsubishi Kasei Corporation - Inventors: Hiroshi Takimoto; Minoru Masuda - Web page: https://patentgrep.com/patent/US5330824A ## CPC - B41M 7/0027: {using protective coatings or layers by lamination or by fusion of the coatings or layers} - Y10T 428/24851: Intermediate layer is discontinuous or differential - Y10T 428/24868: Translucent outer layer - Y10T 428/24876: Intermediate layer contains particulate material [e.g., pigment, etc.] - Y10T 428/24884: Translucent layer comprises natural oil, wax, resin, gum, glue, gelatin - Y10T 428/24934: including paper layer - Y10T 428/24975: No layer or component greater than 5 mils thick - Y10T 428/263: Coating layer not in excess of 5 mils thick or equivalent - Y10T 428/264: Up to 3 mils - Y10T 428/265: 1 mil or less - Y10T 428/31507: Of polycarbonate - Y10T 428/3154: Of fluorinated addition polymer from unsaturated monomers - Y10T 428/31721: Of polyimide - Y10T 428/31786: Of polyester [e.g., alkyd, etc.] - Y10T 428/3179: Next to cellulosic - Y10T 428/31797: Next to addition polymer from unsaturated monomers - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An image protecting film useful for protecting an image recorded on a porous recording medium by an ink jet recording system, which film comprises a light transmitting non-porous support and a layer composed mainly of a polyester resin formed on the support, said polyester resin being a copolymer comprising aliphatic dicarboxylic acid units, aromatic dicarboxylic acid units and aliphatic polyol units. Also disclosed is an image protecting method which comprises overlaying the above image protecting film on a porous recording medium having an image recorded thereon, so that the layer composed mainly of the polyester resin is in contact with the recording medium, followed by hot press bonding. The image protected by the image protecting film and the image protecting method of the present invention is excellent in the light resistance, the water resistance and the color development. ## Claims ### Claim 1 An image protecting film bonded to an image recorded on a porous recording medium by an ink jet recording system, which film comprises a light transmitting non-porous support of an aromatic polyester and a layer composed mainly of a polyester resin directly bonded to the support and also to the image recorded on said porous recording medium, said polyester being a copolymer comprising aliphatic dicarboxylic acid units, aromatic dicarboxylic acid units and aliphatic polyol units; wherein the molar ration of the aliphatic dicarboxylic acid units to the aromatic dicarboxylic acid units in the polyester resin is from 8:2 to 2:8; and wherein said polyester resin has a softening point of from 50.degree. to 130.degree. C., a glass transition point of -30.degree. to 40.degree. C., a number-average molecular weight of from 5000 to 25,000 and a melt viscosity of rom 700 to 3,000 poise at 200.degree. C. ### Claim 2 (depends on 1) The image protecting film according to claim 1, wherein the aliphatic dicarboxylic acid units of the polyester resin are derived from at least one aliphatic dicarboxylic acid selected from the group consisting of malonic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, fumaric acid, maleic acid, itaconic acid and glutaconic acid. ### Claim 3 (depends on 2) The image protecting film according to claim 2, wherein the aliphatic dicarboxylic acid units of the polyester resin are derived from sebacic acid or adipic acid or a mixture thereof. ### Claim 4 (depends on 1) The image protecting film according to claim 1, wherein the aromatic dicarboxylic acid units of the polyester resin are derived from terephthalic acid or isophthalic acid or a mixture thereof. ### Claim 5 (depends on 1) The image protecting film according to claim 1, wherein the aliphatic polyol units of the polyester resin are derived from at least one polyol selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, neopentyl glycol and glycerol. ### Claim 6 (depends on 1) The image protecting film according to claim 1, wherein the polyester resin is a copolymer obtained by reacting an aliphatic dicarboxylic acid, an aromatic dicarboxylic acid and an aliphatic polyol in the presence of a catalyst. ### Claim 7 (depends on 6) The image protecting film according to claim 6, wherein the polyester resin is a copolymer of sebacic acid or adipic acid or a mixture thereof, terephthalic acid or isophthalic acid or a mixture thereof, and ethylene glycol or neopentyl glycol or a mixture thereof. ### Claim 8 (depends on 1) The image protecting film according to claim 1, wherein the light transmitting non-porous support is a film having a thickness of from 30 to 100 .mu.m. ### Claim 9 (depends on 1) The image protecting film according to claim 1, wherein the layer composed mainly of the polyester resin formed on the non-porous support, has a dry thickness of from 5 to 40 .mu.m.