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Reactor-modified polypropylene copolymers that flow through molds
at unprecedented high speed can lift productivity for the end
user, enchance colour, taste and odor properties, and improve
part performance, according to the supplier. Target applications
include housewares, food packaging, an DVD cases. The Pro-fax
ultra range is available in four grades, all nucleated.
Two 100g/10 min melt flow rate grades, Pro-fax Ultra SC973 and
SG982, are primarily for thinwall yogurt and dairy product cups,
and other food containers. The first contains antistatic and slip
additives, and is stiffer.
"The new slate" says Mark Knorr, Montell’s packaging
manager "should enable injection molders to stay ahead of
thermoformers, trading on their ability to make thinwall containers
with high topload strength."
Density is 0.90 g/cm�. Flexural modulus is 1240 MPa; notched
Izod impact strength at 23�C is 42.7 j/m. Other features include
an easier colour match capability, moderate cold-temperature impact,
and excellent gloss.
Pro-fax Ultra SG833 is a 35 MFR grade designed for thinwall frozen
dairy containers, as well as housewares and consumer goods in
which extra low-temperature toughness is desired. It contains
antistatic and slip additives. Features include easier colour
match, resistance to dust and dirt pickup, and excellent gloss.
These properties suit the material for DVD cases.
Finally, SG853, a 55 MFR material, also antistatic and slip modified,
is for electronic cases and thinwall consumer goods.
| Typical properties of Montell
ultra-high-flow PP |
|
|
Value of grade
|
|
Properties
|
SC982 |
SG853
|
|
Density at 23�C, g/ cm�
(ASTM D 1238)
|
0.90
|
0.90
|
Melt flow rate,
g/10 min
(D 792B) |
100 |
55 |
Tensile Strength
@ yield,
MPa (D 638) |
23.43 |
22.05
|
Flexural modulus,
MPa
(D 790A) |
1240 |
1171
|
Deflection temp.
@ 0.45
MPa �C (D 648) |
100 |
105 |
Notched Izod impact
Strength, J/m (D 256A) |
42.7 |
106.8 |
Source : Montell
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