Additives for PET | materials feature
sources and minimize in-house scrap. Among targets in this area identified by various sources are efforts to produce monolayer packaging that replaces up to seven layers in current barrier versions. To do this, additive producers will need new types of chain extenders, impact modifiers and oxygen barriers, as well as ways of upgrading hot-fill properties and other features of barrier structures. A different but no less important barrier
technology is antimicrobial protection. Such additives have a solid record of use in markets like medical, where non-invasive devices such as diagnostic ma- chines, blood testing instruments and even laptop computers and tablets need dependable microbe resistance to keep environments as disease-free as possible. Additive suppliers are broadening the antimi- crobial products they offer to meet evolving needs. Americhem, for example, recently expanded its nShield line of antimicrobial masterbatch additives, originally developed for fibres, to include grades for moulded and extruded PET devices and components. Vaman Kulkarni, polymer additives director, says that
the materials are formulated with organic and silver- based chemistries, and designed for effectiveness and longevity at 2 to 4% loadings. The additives can be customized for different applications, and combined with colorants.
The nShield line, Kulkarni explains, “is an ongoing
platform for Americhem” that is being “constantly expanded” for different markets.
Upgrading recyclate Large volumes of PET are recycled and the quantity continues to grow. Petcore, the European PET recycling
Entira ethylene copolymers
from DuPont increase impact
toughness in CPET frozen food trays
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