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Assignee3M Innovative Properties Company
InventorsStephen A. Johnson, Derek W. Patzman, Richard Y. Liu, John F. Van Derlofske, Kristopher J. Derks, Victor Ho, Kevin T. Huseby
Estimating the term…
A substrate including a self-supporting tri-layer stack is described. The tri-layer stack includes first and second outer layers and a biaxially oriented layer disposed between and in direct contact with the first and second outer layers. The biaxially oriented layer may include a first polyester having greater than 45 mole percent naphthalate units and greater than 45 mole percent ethylene units. Each of the first and second outer layers includes a second polyester which may include 40 to 50 mole percent naphthalate units, at least 25 mole percent ethylene units, and 10 to 25 mole percent of branched or cyclic C4-C10 alkyl units.
A substrate comprising a self-supporting tri-layer stack, the tri-layer stack comprising first and second outer layers and a biaxially oriented layer disposed between and in direct contact with the first and second outer layers, wherein the biaxially oriented layer comprises a first polyester having greater than 45 mole percent naphthalate units and greater than 45 mole percent ethylene units, wherein each of the first and second outer layers comprises a second polyester comprising 40 to 50 mole percent naphthalate units, at least 25 mole percent ethylene units, and 10 to 25 mole percent of branched or cyclic C4-C10 alkyl units.
A substrate comprising a self-supporting tri-layer stack, the tri-layer stack comprising first and second outer layers and a biaxially oriented layer disposed between and in direct contact with the first and second outer layers, wherein the biaxially oriented layer comprises a first polyester comprising a plurality of first monomer units and each of the first and second outer layers comprises a second polyester, the first polyester having a glass transition temperature of at least 90° C., the second polyester being a copolyester comprising a plurality of the first monomer units and a plurality of second monomer units, the second monomer units hindering crystallization of the second polyester.
A substrate comprising a self-supporting tri-layer stack, the tri-layer stack comprising first and second outer layers and a biaxially oriented layer disposed between and in direct contact with the first and second outer layers, each of the first and second outer layers having an in-plane birefringence less than 0.02 and an out-of-plane birefringence less than 0.02, wherein the biaxially oriented layer comprises a first polyester comprising a plurality of first monomer units and each of the first and second outer layers comprises a second polyester, the first polyester having a glass transition temperature of at least 90° C., the second polyester being a copolyester comprising a plurality of the first monomer units.
Dependencies are inferred from the claim text.