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US 8,465,614 B2Granted
Process for recycling waste film and product made therefrom
AssigneeMitsubishi Polyester Film GmbH
InventorsMarshall Dean Ledbetter, Kathleen L. Trojan
Life of this patent
Estimating the term…
Abstract
The present disclosure is directed to a process for recycling film materials, and is particularly directed to collecting spent release liners for labels and constructing new release liner stock from the spent materials. In order to use the waste film, the film is subjected to a process for increasing the intrinsic viscosity. In addition, a coloring agent may be incorporated into the film in order to mask yellowing. In one embodiment, a multilayered composite film is formed.
Claims25
A process for producing a release liner comprising,
- reducing spent liner stock into chips, the spent liner stock having an intrinsic viscosity;
- increasing the intrinsic viscosity of the liner stock chips to from about 0.58 to about 0.7;
- combining the liner stock with a coloring agent;
- and
- heating and extruding the liner stock into a film, the film having a release surface configured to function as a release liner for a laminate material.
2 more elements
A process for producing a release liner comprising:
- reducing spent liner stock into chips, the spent liner stock having an intrinsic viscosity;
- increasing the intrinsic viscosity of the liner stock chips through solid state polymerization;
- combining the liner stock with a coloring agent;
- and
- heating and extruding the liner stock into a film, the film having a release surface configured to function as a release liner for a laminate material.
2 more elements
Dependencies are inferred from the claim text.