High temperature non-crosslinked polyethylene-based foam and method of making the same
OwnerDebabrata Kunduinventor
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Abstract
A linear low density polyethylene (LLDPE) foam and methods of making the same are described. The LLDPE foam has a maximum operating temperature of about 220° F. The LLDPE foam can also have a density in the range of from 0.6 to 10.0 lbs/ft3. The LLDPE foam can be manufactured in part by processing an LLDPE resin in order to create a long branch molecular structure in the LLDPE resin without crosslinking or otherwise adversely affecting the thermoplastic properties of the LLDPE resin.
Claims14
A high-temperature linear low density polyethylene-based foam comprising linear low density polyethylene foam, wherein the high-temperature linear low density polyethylene-based foam has a maximum operating temperature of about 220° F., wherein the low density polyethylene-based foam is formed from an linear low density polyethylene-based resin that is irradiated such that a melt index of the linear low density polyethylene-based resin is reduced from between 15 and 25 at 190° C. to between 0.7 and 5.0 at 190° C.
A method of manufacturing a high-temperature linear low density polyethylene-based foam comprising:
- processing a linear low density polyethylene resin to produce a long branch molecular structure in the linear low density polyethylene resin, wherein the linear low density polyethylene resin has a melt index of between 15 and 25 at 190° C. and is irradiated until the melt index of the linear low density polyethylene resin is reduced to between 0.7 and 5.0 at 190° C.;
- and
- manufacturing a high-temperature linear low density polyethylene-based foam from the processed linear low density polyethylene resin.
The method of claim 112, wherein manufacturing a high temperature linear low density polyethylene-based foam from the processed linear low density polyethylene further comprises the steps of:
- injecting a blowing agent into the melted linear low density polyethylene resin;
- extruding the melted linear low density polyethylene resin;
- and
- passing the melted linear low density polyethylene resin through a die.
Dependencies are inferred from the claim text.