Metallocenes are the latest generation of resin technology. Metallocenes are not necessarily stronger than conventional polyethylenes.
We have evaluated literally dozens of metallocenes which have a variety of characteristics ranging from hazy, soft and stretchy to clear and crispy.
By combining different grades, we can tailor film properties precisely for end-uses.
Frequently Asked Questions about Metallocene:
Q. What is metallocene?
A. Tiny particles of positively charged metal ions sandwiched between two rings of carbon atoms that have five atoms apiece. Also known as “single-site” catalysts, so named because they have one single active site per catalyst particle, each identical from one particle to another.
Q. So we’re talking about a catalyst; how does this affect the attributes of the resin and film?
A. This translates into very pure, consistent properties. Makes a wide variety possible ranging from soft and melting at a low temperature to crispy and clear with good heat resistance. The same rules of density apply to both metallocene and conventional polyethylenes. The lower the density, the lower the melting point and secant modulus ( stiffness ); higher densities are stiffer and have more heat resistance.
Q. How can metallocene make a better package?
A. Chances are you can reduce the wall thickness since many ( not all ) metallocenes are stronger than old fashioned LDPE or even LLDPE. Less plastic, less money. Other metallocenes provide lower seal initiation temperature, faster sealing (cycle speeds) and forgiving seals through contaminants.
Q. What is the difference between metallocene and EVA and why does it make EVA obsolete?
A. EVA is short for “ethylene vinyl acetate” which means that vinyl acetate ( a MONOMER ) is chemically spliced with ethylene ( a MONOMER ) to make EVA CO-polymer. In the 1960’s it was a dramatic improvement, providing easier sealability, strength and clarity at low percentages. Drawbacks include increased softness as VA content increases, higher MVTR (moisture vapor transmission rate), a pungent apple odor and price. We blend metallocenes to mimic any EVA without the trade-offs.
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