Compostable multilayer structures, methods for manufacture and articles prepared therefrom

US6312823A · 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: Sep 29, 1998
• Grant date: Nov 6, 2001
• Expiry date: Sep 29, 2018

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 layer covering the second surface of the core layer. The core layer comprises a lactic acid residue-containing polymer having a glass transition temperature (Tg) below 20.degree. C. At least one of the first and second blocking reducing layers comprise a semicrystalline aliphatic polyester. The core layer may be peroxide modified polylactide polymer which exhibits bridging between polylactide polymer chains.