LANXESS developed four new polyester compounds for LED chips
High light reflection
Virtually no yellowing on exposure to light
or heat
Suitable for lead-free vapor phase
soldering
Cologne - LANXESS has developed four new compounds
for light-emitting diode (LED) housings and sockets. Pocan TP 555-911, -991,
-912 and -992 are based on polycyclohexylenedimethylene terephthalate (PCT),polyester
used by the specialty chemicals company for the first time. The mineral- and/or
glass-fiber-reinforced compounds achieve very high light reflection levels of
93 to nearly 96 percent (at a wavelength of 450 nanometers). Used as a material
for the LED housings, they reflect the light of the LEDs almost completely,
keeping brightness losses to a minimum.
“What is so special about the new products is their good reflection behavior,
which diminishes only minimally over time under standard LED operating
conditions. That is a major advantage over high-melting polyamides, which
eventually yellow from exposure to heat and light, causing their light
reflection and thus the brightness of the LEDS to drop noticeably,” explains
Thomas Malek, New Business Development Manager for lighting technology in
LANXESS’s High Performance Materials business unit.
High temperature of deflection under load : Another advantage of the four innovative products is their very high
temperature of deflection under load. “They can easily withstand temperatures
of 240 to 280 °C like those commonly encountered in lead-free vapor phase
soldering.” Vapor phase soldering without lead is used frequently to connect
the LED chips electrically.
Easy to process, good mechanical properties : The new polyester compounds support a stable manufacturing process and can be
injection molded in a wide processing window despite their high filler content.
“Thanks to the good flow properties, the chip housings and sockets can be
designed with thin walls and slim dimensions,” explains Malek. Processing
temperatures are significantly lower than with high-temperature polyamides. The
mechanical properties of the compounds lend the LED chips good durability. For
example, the elongation at break is between 1.5 and 1.8 percent and the tensile
modulus between 4,200 and 7,000 MPa. This makes the materials ideal for LED
applications requiring better mechanical properties.
About LANXESS
LANXESS
is a leading specialty chemicals company with sales of EUR 7.9 billion in 2015
and about 16,200 employees in 29 countries. The company is currently
represented at 52 production sites worldwide. The core business of LANXESS is
the development, manufacturing and marketing of chemical intermediates,
specialty chemicals and plastics. Through ARLANXEO, the joint venture with
Saudi Aramco, LANXESS is also a leading supplier of synthetic rubber. LANXESS
is listed in the leading sustainability indices Dow Jones Sustainability Index
(DJSI World) and FTSE4 Good.
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