Injection molding polymer
AssigneeBorealis Technology Oy
InventorsHege Vale Baann, Ann Kristin Lindahl
Life of this patent
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Abstract
An LLDPE produced using a single site catalyst, e.g., an LLDPE produced using a metallocene (m-LLDPE), is preferably used in injection moulding of food packaging material, especially closures for food containers. Such materials have been found to exhibit low levels of migration, typically less than 40 mg/dm2, e.g., less than 5 mg/dm2, and are particularly suitable for use in packaging foods having a high fat content.
Claims25
A method for producing a food packaging material which comprises:
- injecting a linear low density polyethylene (LLDPE) produced using a single site catalyst into a mould wherein said LLDPE exhibits the following characteristics:
- an MFR2.16 of from about 20 to 100;
- a density of from about 910 to 930 ka/m3;
- a weight average molecular weight (Mw) of from about 20 to 100 kD;
- a number average molecular weight (Mn) of from about 5 to 30 kD;
- and
- a ratio of the weight average molecular weight to the number average molecular weight (MWD) is about 3 to 6.
An injection moulded article formed from an LLDPE produced using a single site catalyst wherein said LLDPE exhibits the following characteristics:
- an MFR2.16 of from about 20 to 100;
- a density of from about 910 to 930 kg/m3;
- a weight average molecular weight (Mw) of from about 20 to 100 kD;
- a number average molecular weight (Mn) of from about 5 to 30 kD;
- and
- a ratio of the weight average molecular weight to the number average molecular weight (MWD) is about 3 to 6.
An LLDPE suitable for use in injection moulding, said LLDPE comprising a migration level of less than 10 mg/dm2 and having an MFR2.16 of 20 to 100.
A method for producing an article which comprises:
- injecting a linear low density polyethylene (LLDPE) into a mould, wherein said LLDPE has a migration level of less than 10 mg/dm2 and an MFR2.16 of 20 to 100.
A closure for a food container, which closure is formed from an LLDPE wherein said LLDPE exhibits the following characteristics:
- an MFR2.16 of from about 20 to 100;
- a density of from about 910 to 930 kg/m3;
- a weight average molecular weight (Mw) of from about 20 to 100 kD;
- a number average molecular weight (Mn) of from about 5 to 30 kD:
- and
- a ratio of the weight average molecular weight to the number average molecular weight (MWD) is about 3 to 6.
Dependencies are inferred from the claim text.