# US 5,352,553 A · Transparent film and color image forming method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,352,553 A - Document ID: US5352553A - Status: Granted - Kind: A - Application number: 07/986,014 - Filed: 1992-12-04 - Granted: 1994-10-04 - Earliest claimed: 1988-06-29 - Assignees: Canon Kabushiki Kaisha - Inventors: Tatsuo Takeuchi; Koji Amemiya - Web page: https://patentgrep.com/patent/US5352553A ## CPC - G03G 9/08755: {Polyesters} - G03G 7/002: {Organic components thereof} - G03G 7/0073: {Organic components thereof} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract A transparent laminate film, including at least a first transparent resin layer comprising a transparent resin having a heat-resistance, and a second transparent resin layer disposed thereon comprising a transparent resin, wherein the transparent resin of the second transparent resin layer has a compatibility with a binder resin of a toner to be fixed thereon, and has a large elasticity than that of the binder resin of the toner at a fixing temperature of the toner. ## Claims ### Claim 1 A method for forming a light-transmissive color image, comprising: (a) forming on a transparent laminate film a color toner image employing a toner which comprises at least a binder resin and a chromatic colorant; and (b) fixing the color toner image on the transparent laminate film by direct contact with a heat fixing roller together with applying heat and pressure wherein said transparent laminate film comprises at least a first transparent resin layer comprising a heat-resistant first transparent resin, and a second transparent resin layer disposed thereon comprising a second transparent resin; said second transparent resin of the second transparent resin layer being compatible with said binder resin of said toner to be fixed thereon, at a fixing temperature of said toner, wherein said second transparent resin and said binder resin being compatible do not form a visible boundary in a resultant toner image after fixing, and said second transparent resin has an elasticity 5 to 1,000 times that of the binder resin of the toner at the fixing temperature of said toner; wherein (i) said first transparent resin of said first transparent resin layer has a heat distortion temperature of at least 145.degree. C., wherein said first transparent resin is a resin selected from the group consisting of polyethylene terephthalate, polyamide and polyimide; and (ii) said second transparent resin of said second transparent resin layer has a storage elasticity modulus of 100-10,000 dyne/cm.sup.2 at 160.degree. C. ### Claim 2 (depends on 1) A method according to claim 1, wherein said color toner image is formed on the transparent laminate film through electrostatic transfer. ### Claim 3 (depends on 1) A method according to claim 1, wherein said color toner image is fixed on the transparent laminate film by fixing means comprising a heat fixing roller and a pressing roller. ### Claim 4 (depends on 1) A method according to claim 1, wherein said second transparent resin layer comprises a resin having a solubility parameter of 9.5-12.5 (ca.sup.1 /cm.sup.3) 1/2. ### Claim 5 (depends on 1) A method according to claim 1, wherein said second transparent resin layer has a thickness which is 1/2 to 3 times the volume-average particle size of the toner. ### Claim 6 (depends on 1) A method according to claim 1, wherein said first transparent resin layer has a thickness of 50-200 microns, and said second transparent resin layer has a thickness of 3-30 microns. ### Claim 7 (depends on 1) A method according to claim 1, wherein said first transfer resin layer has a thickness of 70-150 microns, and said second transfer resin layer has a thickness of 8-15 microns. ### Claim 8 (depends on 1) A method according to claim 1, wherein said first transparent resin layer comprises polyethylene terephthalate and said second transparent resin layer comprises a resin having a storage elasticity modulus of 500-5,000 dyne/cm.sup.2 at 160.degree. C. ### Claim 9 (depends on 8) A method according to claim 8, wherein said second transparent resin layer comprises a polyester resin. ### Claim 10 (depends on 8) A method according to claim 8, wherein said second transparent resin layer comprises an epoxy resin. ### Claim 11 (depends on 1) A method according to claim 1, wherein the binder resin of the toner comprises a polyester resin. ### Claim 12 (depends on 11) A method according to claim 11, wherein the polyester resin has a storage elasticity modulus of 1-80 dyne/cm.sup.2 at 160.degree. C. ### Claim 13 (depends on 11) A method according to claim 11, wherein the polyester resin has a storage elasticity modulus of 1-30 dyne/cm.sup.2 at 160.degree. C. ### Claim 14 (depends on 12) A method according to claim 12, wherein the polyester resin satisfies a relationship of .vertline.T.sub.1 -T.sub.2 .vertline.=5.degree. to 20.degree. C., wherein T.sub.1 denotes a temperature at which the polyester resin shows an apparent melt viscosity of 10.sup.3 poise, and T.sub.2 denotes a temperature at which the polyester resin shows an apparent melt viscosity of 5.times.10.sup.2 poise. ### Claim 15 (depends on 1) A method according to claim 1, wherein the toner comprises a yellow toner. ### Claim 16 (depends on 1) A method according to claim 1, wherein the toner comprises a magenta toner. ### Claim 17 (depends on 1) A method according to claim 1, wherein the toner comprises a cyan toner. ### Claim 18 (depends on 1) A method according to claim 1, wherein said color toner image is formed from at least two species selected from the group consisting of a yellow toner, a magenta toner and a cyan toner. ### Claim 19 (depends on 1) A method according to claim 1, wherein said color toner image is subjected to color mixing by fixing thereby to form a multi-color or full-color image. ### Claim 20 A method for forming a light transmissive color image comprising: (a) forming on a transparent laminate film a color toner image employing a dry toner which comprises at least a polyester binder resin and a chromatic colorant; and (b) fixing the color toner image on the transparent laminate film by direct contact with a heat fixing roller while applying heat and pressure, wherein said transparent laminate film comprises at least a first transparent resin layer comprising a heat-resistant first transparent resin having a heat distortion temperature of at least 145.degree. C., and a second transparent resin layer disposed thereon comprising a second transparent resin; said second transparent resin of the second transparent resin layer being compatible with said polyester binder resin of said toner to be fixed thereto, and said second transparent resin has a storage elasticity modulus which is 5 to 1000 times that of said toner of 160.degree. C. ### Claim 21 (depends on 20) A method according to claim 20, wherein the first transparent resin comprises polyethylene terephthalate, the second transparent resin has a biphenol A-type dihydroxy component and the toner comprises at least a polyester binder resin having a bisphenol A-type dihydroxy component and a chromatic colorant. ### Claim 22 (depends on 21) A method according to claim 21, wherein the second transparent resin has a storage elasticity modulus of 100-10,000 dyne/cm.sup.2 at 160.degree. C. ### Claim 23 (depends on 20) A method according to claim 20, wherein the color toner image is fixed at a fixing temperature of 130.degree. to 170.degree. C. by fixing means comprising said heat fixing roller and a pressure roller.