ACCUREL®
Technical Information
Additive loading in ACCUREL® MP/XP porous polymer carriers
Introduction
ACCUREL® MP porous polymer carriers are based on PP, HDPE, LDPE, LLDPE and made in a 2-step process. They
do have an open cell structure with interconnected cells. The cell size distribution is roughly between 5 and 20
μm. Depending on the polymer, the porosity ranges from 65 to 78% and the maximum additive loading from 50
to 70%.
ACCUREL®XP porous polymer carriers are based on PP, HDPE, LDPE, LLDPE, EVA, EMA, PA6, PA12, PS, SAN, SBC,
ABS, PET, PC, PMMA, PLA resp. water soluble PVOH. They are made in a 1-step physical cell forming process.
ACCUREL®XP grades mainly have an open cell structure. The cell size distribution is between 20 and 80 μm. The
porosity ranges from 35 to 85% and the maximum additive loading level from 25 to 70%.
The porous polymers act like sponges. Loading of additives into a porous polymer is solely a physical absorption
process. Due to capillary forces the accessible porous structure will be filled with additive.
The absorption rate is mainly determined by the viscosity of the additive. Depending on the viscosity the
maximum additive loading may be achieved in a time frame from 30 min up to 72 h. ACCUREL®MP/XP is most
suitable for liquid, low melting, thermally sensitive, reactive or otherwise difficult to handle additives that cannot
be processed by conventional extrusion compounding or masterbatching techniques.
Requirements
– If the additive is liquid at room temperature, loading can be done at room temperature.
– If the additive is a solid or a paste with a melting point at slightly elevated temperatures, the additive can be
melted and loaded at temperatures slightly above the melting point of the additive. However, the loading
temperature has to be approx. 40°C below the melting or softening point of the polymer, otherwise the
porous structure might collapse.
– If the additive is liquid but highly viscous at room temperature, the viscosity can be reduced in many cases by
increasing the temperature. Again, the temperature should be approx. 40°C below the polymer melting or
softening point.
– The additive can be dissolved in an organic solvent (ethanol, acetone, IPA).
– The viscosity of the additive should not exceed 30.000 cSt.
– Both hydrophilic/hydrophobic and polar/non polar additives can be loaded. In some cases the addition of
wetting agents is required.
suitable for liquid, low melting, thermally sensitive, reactive or otherwise difficult to handle additives that cannot
be processed by conventional extrusion compounding or masterbatching techniques.

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