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2007-08-29 Manufacturing News Source
Antimicrobial Polymers
for Injection Molding and Extrusion
Ticona introduces family of antimicrobial acetals, Anti-Crobe polymers,
that include injection molding and extrusion grades for hot, wet environments.
The growing concern over bacterial contamination in many settings has
led Ticona, the engineering polymers business of Celanese Corporation,
to introduce Anti-Crobe** Antimicrobial Polymers, a family of antimicrobial
acetal copolymers (POM) that includes two injection molding grades and
an extrusion grade. The line is targeted at applications calling for high
performance polymers in environments where heat, moisture and nutrients
foster bacterial and fungal growth.*
Evaluations of these grades, which are made with the company’s Hostaform**
and Celco** POMs, found they greatly inhibit microbial proliferation compared
to conventional acetal. The tests considered bacterial growth at 35°C
(99°F) over 24 hours. One of the injection molded grades, Anti-Crobe
AM90S Plus, gave a log 4 reduction in bacterial activity within 5 hours.
The other injection molding grade, Anti-Crobe AM90S, had a similar action
within 24 hours. These results indicate that Anti-Crobe AM90S Plus is
suitable for rapid bacterial control, while Anti-Crobe AM90S is appropriate
in less-demanding situations.
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Anti-Crobe Antimicrobial
Polymers from Ticona. Click
Here for High resolution image. photo: Ticona |
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Evaluation of two Anti-Crobe acetals grades using the Efficacy Test Method
JIS Z 2801 for microbe proliferation showed they greatly inhibited microbial
growth compared to conventional acetal. The tests indicate that Anti-Crobe
AM90S Plus is suitable for rapid bacterial control, while Anti-Crobe AM90S
is appropriate in less-demanding situations. See photo at right. ->
"The advanced, inorganic antimicrobial formulation in these grades
is present throughout the polymer matrix, not just on the surface, and
does not migrate significantly," says Davida Barrett, Technical Marketing.
"This means that Anti-Crobe resins won’t abrade or scratch
off, so they preserve product performance and service life by deterring
bacteria and fungal attack that can cause odors, contamination, stains,
biofilms and mechanical property loss."
Anti-Crobe Antimicrobial Polymers comply with FDA regulations for direct
food contact, meet the NSF 61 Potable Water standard, and satisfy applicable
EPA regulations. They are naturally white and can be tinted as needed.
They retain all traditional physical and mechanical properties associated
with Hostaform and Celcon POMs. For example, they have a tensile modulus
of 2600 MPa, a flexural modulus of 2500 MPa, a tensile stress at yield
of about 63 MPa, and a notched Charpy impact strength of 7 kJ/m2. They
also have excellent resistance to chemicals and dimensional stability,
are inherently lubricious, and withstand continuous exposure to hot water
at 82°C (180°F) (and intermittent exposure to water at 100°C
(212°F) or more).
Anti-Crobe POMs are suitable for many end uses, especially in hard-to-clean
wet areas and where polyolefins cannot meet performance specifications.
Their possible applications include food processing, storage and handling
systems, industrial gears in wet environments, and elements in water treatment
plants. Other potential uses include automotive heating and air conditioning
systems, medical devices, appliances, spa and bathroom products, material
handling systems, office products, sports equipment, and irrigation and
other fluid-based systems.
* Anti-Crobe Antimicrobial Polymers do not protect users or others against
disease-causing (or food-borne) bacteria. Antimicrobial properties apply
to the molded part only. No public health claims are made with resins
that have antimicrobial additives or the products that contain them.
** Hostaform, Anti-Crobe and Celcon are registered trademarks of Ticona
or its affiliates.
Read a recent press release about - Bayer MaterialScience to exhibit a
wide range of high-quality polymers
products and applications at Khimia 2007 in Moscow.
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