US2016075114A1PendingUtilityA1

Transparent Conductive Composite Films

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Assignee: DUPONT TEIJIN FILMS US LTDPriority: May 14, 2009Filed: Nov 24, 2015Published: Mar 17, 2016
Est. expiryMay 14, 2029(~2.8 yrs left)· nominal 20-yr term from priority
Inventors:Xavier Bories-AzeauTina Wright
B32B 2307/206B32B 27/36B32B 2307/202B32B 2307/412H01B 1/22B32B 27/08B32B 2262/103B32B 2307/518B32B 2262/106B32B 33/00B32B 2307/31B32B 37/04
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Claims

Abstract

A transparent conductive film includes (i) a polymeric substrate that includes a polyester base layer and a polyester binding layer, wherein the polymeric material of the base layer has a softening temperature T S-B , and the polymeric material of the binding layer has a softening temperature T S-HS , wherein T S-HS is at least 5° C. below T S-B ; and (ii) a conductive layer that includes a plurality of nanowires, wherein the nanowires are bound by the polymeric matrix of the binding layer such that the nanowires are dispersed at least partially in the polymeric matrix of the binding layer; and wherein the polymeric substrate is a biaxially oriented polyester substrate.

Claims

exact text as granted — not AI-modified
1 . A transparent conductive film comprising:
 (i) a polymeric substrate comprising a polyester base layer and a polyester binding layer, wherein the polymeric material of the base layer has a softening temperature T S-B , and the polymeric material of the binding layer has a softening temperature T S-HS , wherein T S-HS  is at least 5° C. below T S-B ; and   (ii) a conductive layer comprising a plurality of nanowires,   wherein said nanowires are bound by the polymeric matrix of the binding layer such that the nanowires are dispersed at least partially in the polymeric matrix of the binding layer; and   wherein said polymeric substrate is a biaxially oriented polyester substrate.   
     
     
         2 . The transparent conductive film according to  claim 1  wherein the conductive film exhibits a total light transmittance over the visible range (TLT) of at least 65%, and/or a haze of no more than 50%. 
     
     
         3 . The transparent conductive film according to  claim 1  wherein the polyester of the base layer is selected from poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalate). 
     
     
         4 . The transparent conductive film according to  claim 1  wherein said binding layer is a heat-sealable layer. 
     
     
         5 . The transparent conductive film according to  claim 1  wherein the binding layer is a copolyester selected from the group consisting of:
 (A) a copolyester derived from one or more aliphatic glycol(s) and two or more aromatic dicarboxylic acids; 
 (B) a copolyester derived from at least one aromatic dicarboxylic acid and at least one aliphatic dicarboxylic acid with one or more glycol(s); and 
 (C) a copolyester derived from an aliphatic diol and a cycloaliphatic diol with one or more aromatic dicarboxylic acid(s). 
 
     
     
         6 . The transparent conductive film according to  claim 5  wherein the copolyester is selected from the group consisting of:
 (i) a copolyester derived from ethylene glycol, terephthalic acid and isophthalic acid; 
 (ii) a copolyester derived from terephthalic acid, an aliphatic dicarboxylic acid and a glycol; and 
 (iii) a copolyester derived from terephthalic acid, ethylene glycol and 1,4-cyclohexanedimethanol. 
 
     
     
         7 . The transparent conductive film according to  claim 6  wherein the copolyester is selected from the group consisting of:
 (i) a copolyester derived from ethylene glycol, terephthalic acid and isophthalic acid which exhibits a molar ratio of the terephthalic acid component to the isophthalic acid component in the range from 25:75 to 85:15; and 
 (ii) a copolyester derived from terephthalic acid, an aliphatic dicarboxylic acid and ethylene glycol which exhibits a molar ratio of the terephthalic acid component to the aliphatic dicarboxylic acid component about 50:50 to about 70:30. 
 
     
     
         8 . The transparent conductive film according to  claim 6  wherein the copolyester is derived from terephthalic acid, azelaic acid and ethylene glycol. 
     
     
         9 . The transparent conductive film according to  claim 7  wherein the copolyester is derived from terephthalic acid, azelaic acid and ethylene glycol. 
     
     
         10 . The transparent conductive film according to  claim 1  wherein the total thickness of the substrate is no more than 350 μm. 
     
     
         11 . The transparent conductive film according to  claim 1  wherein the sheet resistance of the transparent conductive film is less than 100,000 ohms per square. 
     
     
         12 . The transparent conductive film according to  claim 1  wherein the nanowires are metal nanowires. 
     
     
         13 . The transparent conductive film according to  claim 1  wherein the nanowires are silver nanowires. 
     
     
         14 . The transparent conductive film according to  claim 1  wherein the nanowires are carbon nanotubes. 
     
     
         15 . The transparent conductive film according to  claim 1  obtained by a process comprising the steps of providing a polymeric substrate comprising a polyester base layer and a polyester binding layer; disposing said nanowires on the exposed surface of the binding layer; and heating the composite film to a temperature T 1  wherein T 1  is equal to or greater than T S-HS , and T 1  is at least about 5° C. below T S-B ;
 wherein said conductive layer comprising said nanowires is applied to the surface of the binding layer of the substrate during the film manufacturing process and prior to the heat-setting step, wherein following deposition of the nanowires, the film is heated to temperature T 1 . 
 
     
     
         16 . The transparent conductive film according to  claim 15  wherein said nanowires are disposed on the exposed surface of the binding layer by dispersing said nanowires in a liquid vehicle and coating the nanowire-containing liquid onto the exposed surface of the binding layer. 
     
     
         17 . The transparent conductive film according to  claim 15  wherein the conductive film exhibits a total light transmittance over the visible range (TLT) of at least 65%, and/or a haze of no more than 50%. 
     
     
         18 . The transparent conductive film according to  claim 15  wherein the polyester of the base layer is selected from poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalate). 
     
     
         19 . The transparent conductive film according to  claim 15  wherein the binding layer is a copolyester selected from the group consisting of:
 (A) a copolyester derived from one or more aliphatic glycol(s) and two or more aromatic dicarboxylic acids; 
 (B) a copolyester derived from at least one aromatic dicarboxylic acid and at least one aliphatic dicarboxylic acid with one or more glycol(s); and 
 (C) a copolyester derived from an aliphatic diol and a cycloaliphatic diol with one or more aromatic dicarboxylic acid(s). 
 
     
     
         20 . The transparent conductive film according to  claim 19  wherein the copolyester is selected from the group consisting of:
 (i) a copolyester derived from ethylene glycol, terephthalic acid and isophthalic acid; 
 (ii) a copolyester derived from terephthalic acid, an aliphatic dicarboxylic acid and a glycol; and 
 (iii) a copolyester derived from terephthalic acid, ethylene glycol and 1,4-cyclohexanedimethanol. 
 
     
     
         21 . The transparent conductive film according to  claim 20  wherein the copolyester is selected from the group consisting of:
 (i) a copolyester derived from ethylene glycol, terephthalic acid and isophthalic acid which exhibits a molar ratio of the terephthalic acid component to the isophthalic acid component in the range from 25:75 to 85:15; and 
 (ii) a copolyester derived from terephthalic acid, an aliphatic dicarboxylic acid and ethylene glycol which exhibits a molar ratio of the terephthalic acid component to the aliphatic dicarboxylic acid component about 50:50 to about 70:30. 
 
     
     
         22 . The transparent conductive film according to  claim 20  wherein the copolyester is derived from terephthalic acid, azelaic acid and ethylene glycol. 
     
     
         23 . The transparent conductive film according to  claim 21  wherein the copolyester is derived from terephthalic acid, azelaic acid and ethylene glycol. 
     
     
         24 . The transparent conductive film according to  claim 15  wherein the binding layer and base layer are coextruded. 
     
     
         25 . The transparent conductive film according to  claim 15  wherein the total thickness of the substrate is no more than 350 μm. 
     
     
         26 . The transparent conductive film according to  claim 15  wherein the sheet resistance of the transparent conductive film is less than 100,000 ohms per square. 
     
     
         27 . The transparent conductive film according to  claim 15  wherein the nanowires are metal nanowires. 
     
     
         28 . The transparent conductive film according to  claim 15  wherein the nanowires are silver nanowires. 
     
     
         29 . The transparent conductive film according to  claim 15  wherein the nanowires are carbon nanotubes. 
     
     
         30 . The transparent conductive film according to  claim 15  wherein the conductive layer is applied to the surface of the binding layer of the substrate between the two stages (longitudinal and transverse) of a biaxial stretching operation, and/or wherein the heating temperature T 1  is in the range of from about 50° C. to about 240° C.

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