Compostable multilayer structures, methods for manufacture, and articles prepared therefrom

US5849401A · kind A · utility

Assignee

• CARGILL, INCORPORATED · US

Inventors

• Ali El-Afandi · Maplewood, US
• Patrick R. Gruber · Blaine, US
• Jeffrey John Kolstad · Wayzata, US
• James Lunt · Sarnia, CA
• Christopher M. Ryan · Dayton, US
• James Nangeroni · Doylestown, US
• Nancy Uzelac Buehler · Minneapolis, US
• Mark Hartmann · Minnetonka, US
• Jed Richard Randall · Minneapolis, US
• Andrea L. Brosch · Eden Prairie, US

Key dates

• Filing date: May 3, 1996
• Grant date: Dec 15, 1998
• Expiry date: May 3, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/3179
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A compostable multilayer film includes a core layer having a first surface and a second surface, a first blocking reducing layer covering the first surface of the core layer, and a second blocking reducing core layer comprises a lactic acid residue-containing polymer having a glass transition temperature (Tg) below 20.degree. C. The first and second blocking reducing layers comprise a semicrystalline aliphatic polyester. The hydrolyzable polymer and have a T.sub.g above about 50.degree. C. The multilayer structure can be used for preparing bags and wrappers.