Process for recycling immiscibles in pet film
AssigneeToray Plastics (America), Inc.
InventorsDouglas J. Bower, Arron Carroll, Satoshi Yamamoto
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Abstract
Described are methods for recycling biaxially oriented thermoplastic crystallizable films, such as polyester terephthalate (PET) films, that have been coated with various polymers or waxes that are immiscible in the primary molten thermoplastic. The resultant processed recycle can be used to make new biaxially oriented thermoplastic films while avoiding process instability and optical defects in the finished film associated with immiscible polymeric and/or wax coatings.
Claims22
A method for recycling a coated thermoplastic film coated with 0.1 wt %-20 wt % polymers or waxes that are immiscible in the molten thermoplastic comprising:
- densifying the coated thermoplastic film;
- feeding the densified coated thermoplastic film into a multi-screw secondary extruder with vacuum to form a molten polymer;
- filtering the molten polymer to produce a recycled resin;
- and
- producing a biaxially oriented thermoplastic film from the recycled resin, wherein the film does not contain surface or embedded optical defects larger than 100 microns.
A biaxially oriented thermoplastic film that does not contain surface or embedded optical defects larger than 100 microns comprising:
- recycled coated thermoplastic film material produced by a process comprising:
- densifying a coated thermoplastic film comprising a thermoplastic film and a coating of 0.1 wt %-20 wt % polymers or waxes that are immiscible in the molten thermoplastic;
- feeding the densified coated thermoplastic film into a multi-screw secondary extruder with vacuum to form a molten polymer;
- and
- filtering the molten polymer to produce the recycled coated thermoplastic film material.
Dependencies are inferred from the claim text.