Sanyo Electrichas delayed the introduction of an optical
disc based on a polymer derived from corn that was announced last
year as a more environmentally friendly alternative to plastic
discs.
The disc, called "MildDisc" by Sanyo, was to have been offered
to customers from December last year and volume production was due
to begin in the first half of this year but this has been delayed
while Sanyo refines the technology, said Ryan Watson, a spokesman
for the company.
"There was a concern that if the disc was exposed to heat
greater than 50 degrees Celsius that it wouldn't work properly,"
said Watson.
"The main obstacle that they are working on now is trying to
improve the disc's resistance to heat. They can easily improve its
resistance to heat with a mix of material but that kind of defeats
the purpose of the MildDisc."
When it was announced last October the company received "quite a
few" inquiries from potential customers, said Watson.
Sanyo is promoting its use in place of conventional discs for
applications such as free CDs bundled with magazines or discs that
are given away at trade shows or via direct mailings.
Production of the plastic used in the MildDisc begins with
Cargill Dow in the US. It mills kernels of corn to separate out the
starch and then processes these to get unrefined dextrose. Using a
fermentation process similar to that of beer production, the
dextrose is converted into lactic acid, according to the company's
website.
Sanyo converts the lactic acid into a polymer used in the disc
substrate using a method developed with Japan's Mitsui
Chemicals.
Sanyo estimates that around 85 corn kernels, each weighing an
average of 0.5 grams, are needed to produce enough polymer for a
single 12cm optical disc, so an average ear of corn can produce
around 10 discs.
The International Recording Media Association estimates world
demand for CDs at around nine billion annually, and the US
Department of Agriculture estimates world corn production at about
600 million tons, so less than 0.1% of the world's corn production
is theoretically required to produce enough polymer to satisfy
worldwide disc demand.
Martyn Williams writes for IDG News Service