SDK Develops Printable Conductive Inks for Electronics

SDK Develops Printable Conductive Inks for Electronics 
- Providing Silver Nanowire and Copper/Silver Hybrid-Type Inks - 
Tokyo, Oct 1, 2012 - (JCN Newswire) - Showa Denko K.K. (SDK) has developed
printable silver nanowire ink for the manufacture of electronic devices jointly
with Professor Katsuaki Suganuma of Osaka University.  When the ink is used in
combination with Photonic Curing(TM) process technology, highly stable,
transparent conductive patterns can be formed on flexible films. 
Silver nanowire ink can produce transparent conductive films with low sheet
resistance (electrical resistance measured in thin film with uniform
thickness).  Thus, the ink is expected to replace indium tin oxide (ITO)
transparent conductive film for touch screen applications.  The problem with
conventional silver nanowire ink is that the application of a printing process
is difficult due to ink properties and heating at high temperatures and etching
are necessary after coating of the ink on a substrate.  This means that it is
difficult to use the ink on plastic substrates with low resistance to heat and
the fabrication process is complicated.  However, SDK has succeeded in
developing printable silver nanowire ink by improving the ink's properties
and adhesion, enabling its use on plastic substrates.  Furthermore, SDK has
succeeded in instantly curing printed circuits and making them conductive by
using Photonic Curing process technology provided by NovaCentrix, of the United
States.  As the conductive film based on silver nanowire ink does not require
indium, a kind of rare metal used in ITO, there is no problem of natural
resource restrictions. 
SDK has also developed copper/silver hybrid ink.  While silver ink is already
used widely, it has a problem of high cost and substantial degree of migration
(movement of metals on the surface of or inside a nonmetallic medium, resulting
in short circuit).  SDK's new hybrid ink is made by adding a small amount
of silver nanoparticles to copper nanoparticles.  When this ink is used in
combination with Photonic Curing process technology, printed patterns provide
high conductivity similar to that of silver-ink-based patterns despite the high
copper content.  At the same time, migration is restricted to a low level.  The
hybrid ink can be used as a low-cost substitute for conventional silver ink and
paste. 
Printed electronic - the technology to manufacture electronic circuits and
devices through printing, using conductive ink, etc. - is expected to be
increasingly used as it enables substantial simplification of manufacturing
processes.  To meet future market growth, SDK will continue development of
silver nanowire ink for the production of transparent conductive film.  As for
the copper/silver hybrid ink, SDK will start sample shipments this month. 
SDK will present the silver nanowire ink and copper/silver hybrid ink at
Printed Electronics Asia 2012 to be held at Hilton Tokyo on October 2 and 3. 
About Showa Denko 
Showa Denko K.K. ('SDK'; TSE: 4004, US: SHWDF) is a major
manufacturer and marketer of chemical products serving a wide range of fields
ranging from heavy industry to the electronic and computer industries. SDK
makes petrochemicals (ethylene, propylene), aluminum products (ingots, rods),
electronic equipment (hard disks for computers) and inorganic materials
(ceramics, carbons). The company has overseas operations and a joint venture
with Netherlands-based Montell and Nippon Petrochemicals to make and market
polypropylenes. In March 2001, SDK merged with Showa Denko Aluminum Corporation
to strengthen the high-value-added fabricated aluminum products operations, and
is today developing next-generation optical communications-use wafers. For more
information, please visit www.sdk.co.jp . 
Contact: 
Showa Denko K.K. (SDK)
IR & PR Office
Tel: +81-3-5470-3235 
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