04/30/2009 01:26:42 PM Copyright E.I. du Pont de Nemours and Company, Inc. 1 of 3
DuPont Packaging & Industrial Polymers
DuPont™ Appeel® 22D843
Appeel® resins Product Data Sheet
Description
Product Description DuPont™ Appeel® 22D843 is a polypropylene modified ethylene acrylate resin
designed to function as a masterbatch to achieve peelability in polypropylene based
sealant layers.
It provides peelable seals over a broad temperature range. The peel layers will
sustain sterilization conditions of 121°C for 20 minutes through 134°C for 6 minutes
depending on the base of the PP seal materials.
When blending for this type of application, 22D843 should be evaluated as a
modifier for HoPP or CoPP by addition rates between 20% to 40% by weight.
Blends with CoPP will usually provide better results.
Appeel® 22D843 is available in pellet form for use in conventional extrusion and
coextrusion equipment designed to process polyethylene resins.
Restrictions
Material Status Developmental: Active
Typical Characteristics
Features DuPont™ Appeel® 22D843 may also be considered to evaluate as a sealing layer for
lidding applications, though it has not been tested in this manner yet. It may have
functionality as a peelable sealant to a number of container materials including PET,
PVC, PS and PP, as well as Paper surfaces.
Typical Properties
Physical Nominal Values Test Method (s)
Density () 0.937 g/cm³ ASTM D792 ISO 1183
Melt Flow Rate (190°C/2.16kg) 2.65 g/10 min ASTM D1238 ISO 1133
Thermal Nominal Values Test Method (s)
Melting Point (DSC) 136°C (277°F) ASTM D3417 ISO 3146
Heat Seal Evaluation The performance of any sealant resin should be evaluated within the context of the
application. The sealant is designed to bond to particular substrate(s). Many variables
can affect seal strength, including the physical properties of the substrate being sealed
to, thickness, flange or surface design, heat seal temperature, dwell time and
pressure. The condition and type of the sealing equipment used, such as roller sealers
versus platen seal mechanisms can make a significant difference.
In most cases sealant peel strength is used as a measure of performance. Although
this is a convenient test, peel strength is affected not only by substrate adhesion but
also by peel angle, separation rate, ambient temperature, tensile and modulus
properties of the materials, and often by the time elapsed since the formation of the
bond.
If sealant peel strength is used as a measure of sealant performance, it is imperative
that peel strength be evaluated not only at the time of initial heat sealing the lid to the
substrate, but throughout the life of the product and under all the conditions to which
the sealant will be exposed. Only then does peel strength provide a reliable indication
of
adhesive performance in the specific application.
