Multilayer oriented polyester film with anti-static property for molding processes
AssigneeToray Plastics (America), Inc.
InventorsCarlos E. HINTON, Nao Yokota, Jan Moritz
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Abstract
Described are methods for producing biaxially oriented thermoplastic crystallizable films, such as polyester terephthalate (PET) films, that are easy to handle, have at least one surface that can produce high quality finishes in In-Mold Decoration processes (IMD), and have anti-static properties. The static dissipation properties of the film facilitate the manufacture of IMD parts by reducing buildup of debris in the mold and reducing the risk of fire during processing.
Claims27
A multi layer biaxially oriented polyester film for molding processes comprising:
- an outer layer A having an Rq roughness from 1 nm to 8 nm and a thickness of 15 micrometers to 60 micrometers;
- and
- an outer layer B having an Rq roughness from 20 nm to 60 nm and a thickness of 0.5 to 5 micrometers,
- wherein at least layer A or layer B has a Surface Resistivity of less than 1×10+11 Ohm/square provided by an anionic surfactant and nonionic surfactant combination that is impregnated into layer A or layer B, and the Rq of layer B is greater than layer A.
A method of making a multi layer biaxially oriented polyester film comprising:
- co-extruding a film comprising an outer layer A having an Rq roughness from 1 nm to 8 nm and a thickness of 15 micrometers to 60 micrometers, and an outer layer B having an Rq roughness from 20 nm to 60 nm and a thickness of 0.5 to 5 micrometers;
- and
- biaxially orienting the film,
- wherein at least layer A or layer B has a Surface Resistivity of less than 1×10+11 Ohm/square provided by an anionic surfactant and nonionic surfactant combination that is impregnated into layer A or layer B, and the Rq of layer B is greater than layer A.
Dependencies are inferred from the claim text.