US 11,987,696 B2
Biobased polyester blends with enhanced performance properties
Shilpa Manjure, Woodbury, MN (US); and Matthew Lundblad, Woodbury, MN (US)
Assigned to Northern Technologies International Corporation, Circle Pines, MN (US)
Appl. No. 17/261,367
Filed by NORTHERN TECHNOLOGIES INTERNATIONAL CORPORATION, Circle Pines, MN (US)
PCT Filed Aug. 7, 2018, PCT No. PCT/US2018/045586
§ 371(c)(1), (2) Date Jan. 19, 2021,
PCT Pub. No. WO2020/032931, PCT Pub. Date Feb. 13, 2020.
Prior Publication US 2021/0277228 A1, Sep. 9, 2021
Int. Cl. C08L 67/04 (2006.01)
CPC C08L 67/04 (2013.01) [C08L 2201/06 (2013.01); C08L 2205/025 (2013.01); C08L 2205/03 (2013.01); C08L 2207/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A biodegradable and compostable blend of thermoplastic polymers, comprising:
from about 50 wt. % to about 80 wt. % of one or more poly(lactic) acid (PLA) polymers wherein said PLA polymers, independently, have a weight average molecular weight of from about 125,000 to about 200,000;
from about 5 wt. % to about 30 wt. % of one or more additional compostable polyesters comprising polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and polybutylene adipate co-terepthalate (PBAT) with or without biobased carbon content wherein said polyesters, independently, have a weight average molecular weight of from about 80,000 to about 175,000;
from about 7 wt. % to about 15 wt. % of one or more polyethylene glycols (PEGs) with or without biobased carbon content, wherein said PEGs, independently, have a weight average molecular weight of from about 2,000 to about 10,000;
wherein said weight percent is based upon the total weight of said one or more PLAs, said one or more additional compostable polyesters, and said one or more PEGs; and
wherein said blend has an elongation of at least 500% according to ASTM Test D638-10 for injection molded specimens.