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Property enhancing fillers for transparent coatings and transparent conductive films

Pending Publication Date: 2016-04-07
C3 NANO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a new technology for creating optical structures and conductive films with improved properties. The technology involves using a coating made of a polymer binder and nanodiamonds or nanoparticles. These nanoparticles can be made of various materials and have high thermal conductivity, dielectric constant, or hardness. The resulting optical structures and conductive films have improved optical properties and can be used in various applications. The patent also describes a solution containing a curable polymer binder and nanoparticles.

Problems solved by technology

For example, ITO is a brittle ceramic which needs to be deposited using sputtering, a fabrication process that involves high temperatures and vacuum and therefore can be relatively slow.
Additionally, ITO is known to crack easily on flexible substrates.

Method used

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  • Property enhancing fillers for transparent coatings and transparent conductive films
  • Property enhancing fillers for transparent coatings and transparent conductive films
  • Property enhancing fillers for transparent coatings and transparent conductive films

Examples

Experimental program
Comparison scheme
Effect test

example 1

Effect of Nanodiamonds on Commercial Overcoat on a Transparent Substrate

[0098]This example tests the effect on the hardness of a commercial overcoat loaded with nanodiamonds on PET substrate with an initial polymer binder overcoat.

[0099]The substrate was prepared by coating a base ink with a cellulose based polymer binder but without any silver nanowires was coated onto a transparent PET substrate and dried. The coated substrate had a haze of 0.72%. A commercial coating polymer from Dexerials was dissolved in N,N-dimethylformamide (DMF). Six samples were prepared with two samples at each of 2 wt %, 3 wt % and 4 wt % polymer concentrations. In one sample at each polymer concentration, hydrogen terminated nanodiamonds were added, respectively, at 0.2 wt %, 0.3 wt %, or 0.4 wt % concentrations, so that in each diamond containing sample, the diamond concentrations were about one tenth the polymer concentration. The coating solutions were deposited onto the substrate by slot coating at 1...

example 2

Effect of Nanodiamond in Conductive Inks

[0100]This example tests the hardness of films having a fused metal nanostructured layers with nanodiamonds incorporated into the conductive layer with a hard coating applied over the conductive layer.

[0101]A silver nanowire ink was prepared as described above except for the addition of 0.036 wt % nanodiamonds with hydrogen terminated surface in the ink. The nanodiamonds were initially dispersed in a gamma-butyrolactone solvent prior to mixing into the silver nanowire inks. The nanowire inks were slot coated onto a PET film substrate and dried to fuse the nanowires into a fused metal nanostructured network forming a conductive layer. An overcoating composition was prepared as described in Example 1 except at a polymer concentration of 0.5 wt % and without nanodiamonds. The overcoat was processed similarly as described in Example 1 with slot coating onto the dried fused metal conductive layer, drying of the coating and UV curing the coating.

[01...

example 3

Effect of Nanodiamonds in Commercial Overcoats Over a Transparent Conductive Layer

[0103]This example tests the hardness of transparent conductive films incorporating commercial overcoats incorporating nanodiamonds.

[0104]The silver nanowire was deposited and processed as described above. Following drying, the layer comprised fused metal nanostructured network within the sparse metal conductive layer. The sheet resistances for the conductive layers were between 50 and 60 ohms / sq., and the thin overcoat layers did not significantly change the sheet resistance of the film after applying the and curing the overcoat. Two different metal nanowire ink systems were tested in combination with 3 different commercial overcoats, three different corresponding solvent systems and three different initial nanodiamond dispersions. The substrates with the fused metal nanostructured network had an initial haze prior to application of the overcoat of 1.12% with the first ink system and 1.28% with the se...

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Abstract

Optically transparent films can comprise a coating of nanodiamonds to introduce desirable properties, such as hardness, good thermal conductivity and an increased dielectric constant. In general, transparent conductive films can be formed with desirable property enhancing nanoparticles included in a transparent conductive layer and / or in a coating layer. Property enhancing nanoparticles can be formed from materials having a large hardness parameter, a large thermal conductivity and / or a large dielectric constant. Suitable polymers are incorporated as a binder in the layers with the property enhancing nanoparticles. The coatings with property enhancing nanoparticles can be solution coated and corresponding solutions are described.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to copending U.S. provisional patent application Ser. No. 62 / 059,376, filed Oct. 3, 2014 to Virkar et al., entitled “Property Enhancing Fillers for Coatings and Transparent Conductive Films,” incorporated herein by reference.FIELD OF THE INVENTION[0002]The invention is related to thin polymer films loaded with property enhancing nanoparticles, such as nanoparticles contributing to hardness and abrasion resistance, thermal conductivity and / or a high dielectric constant. The invention further relates to transparent conductive films incorporating a thin polymer layer loaded with property enhancing nanoparticles, which may or may not be in a layer providing the electrical conductivity and / or a coating layer associated with the transparent conductive layer. The invention also relates to transparent polymer-based films comprising nanodiamonds. In addition, the invention relates to coating solutions that comprise...

Claims

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Application Information

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IPC IPC(8): C09D101/02G02B1/14C09D133/14C09D163/00C09D133/08
CPCC09D101/02C09D163/00G02B1/14C09D133/14C09D133/08C08K3/04C09D101/10C09D101/18C09D101/26G02B1/16C09D7/61G02B1/04
Inventor VIRKAR, AJAYMANZOUR, FARAZ AZADIYANG, XIQIANGGU, HUA
Owner C3 NANO INC
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