Polylactide-based compositions

US8119713B2 · kind B2 · utility

Assignees

• MATERIA NOVA · BE
• Ecole Nationale Superieure de Chimie
• Ecole Nationale Superieure des Arts et Industries Textiles · FR

Inventors

• Philippe Dubois · Braives, BE
• Marius Murariu · Mons, BE
• Michael Alexandre · Angleur, BE
• Philippe Degee · Grâce-Hollogne, BE
• Serge Bourbigot · Villeneuve-d'Ascq, FR
• Rene Delobel · Villeneuve-d'Ascq, FR
• Gaelle Fontaine · Villeneuve-d'Ascq, FR
• Eric Devaux · Roubaix, FR

Key dates

• Filing date: Feb 1, 2008
• Grant date: Feb 21, 2012
• Expiry date: Feb 1, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K2003/3045
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polylactide-based polymer or copolymer (PLA) compositions with improved flame retardancy properties as obtained by conventional melt-blending of PLA polyester matrix (1) with both calcium sulfate (2) and organo-modified layered silicates (OMLS) (3). Combination of CaSO4 and OMLS exhibits synergistic effects on PLA flame retardancy by both significantly increasing the time to ignition and decreasing the heat release rate per unit area, and promoting non-dripping properties. Moreover, all other properties of PLA remain almost unchanged or are improved as regards to pristine PLA, especially thermal and mechanical properties.