Available Technologies

Executive Summary

Biobased materials such as polybutylene adipate terephthalate (PBAT), polyglycolic acid (PGA) and polybutylene succinate (PBS) are attractive materials for packaging films due to their positive sustainability aspects including biodegradability. However, their oxygen barrier properties limit the use of these materials to certain applications. Researchers at Michigan State University have recently developed a new film technology that improves oxygen and water barrier in biobased polyesters, thus providing a sustainable packaging solution for a broader range of applications then currently possible.

Description of the Technology

The technology is a based on processing modifications and the addition of an additive package to polyesters. Specifically, work has been done with PBAT, PGA and PBS materials and their blends. The films have oxygen transmission rates (OTR) down to 0.47 cc-mm/m2/24 hour (@50% RH, 23*C) and water vapor transmission rate (WVTR) down to 1.41 g-mm/m2/24 h (@90% RH, 38*C) in unstretched state. The films also meeting other packaging requirements such as tensile strength, sealing, puncture resistance, etc. A range of tests including tensile, elongation, seal strength, slow puncture, Elmendorf Tear have been conducted. Chemical recycling is complete to 95% in 30 min at 190^oC.

Benefits

• Biodegradable
• Recyclable by mechanical or chemical methods
• Improves oxygen and water vapor barrier

Applications

• Single layer or multilayer films
• Flexible or rigid packaging

Patent Status

• Under discussion

Licensing Rights

Licensing rights available

Inventors

Dr. Muhammad Rabnawaz, Dr. Mohamed Abdelwahab

TECH ID

TEC2023-0123