Substrate including a self-supporting tri-layer stack

US11683977B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Stephen A. Johnson · Woodbury, US
• Derek W. Patzman · Savage, US
• Richard Y. Liu · Woodbury, US
• John F. Van Derlofske, III · Minneapolis, US
• Kristopher J. Derks · Woodbury, US
• Victor Ho · Windom, US
• Kevin T. Huseby · Oakdale, US

Key dates

• Filing date: Nov 19, 2018
• Grant date: Jun 20, 2023
• Expiry date: Nov 19, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31786
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

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.