US 12,275,842 B2
Fast-hydrolyzing polylactide resin compositions
James Russell Valentine, Chanhassen, MN (US); Joseph David Schroeder, Minneapolis, MN (US); Krag Ellis Anderson, Fridley, MN (US); Manuel A. W. Natal, Eden Prairie, MN (US); and Oliver J. Palardy, Minneapolis, MN (US)
Assigned to NatureWorks LLC, Plymouth, MN (US)
Appl. No. 17/614,609
Filed by NatureWorks LLC, Minnetonka, MN (US)
PCT Filed May 25, 2020, PCT No. PCT/US2020/034449
§ 371(c)(1), (2) Date Nov. 29, 2021,
PCT Pub. No. WO2020/251745, PCT Pub. Date Dec. 17, 2020.
Claims priority of provisional application 62/861,047, filed on Jun. 13, 2019.
Prior Publication US 2022/0235222 A1, Jul. 28, 2022
Int. Cl. C08L 67/04 (2006.01); C09K 8/508 (2006.01)
CPC C08L 67/04 (2013.01) [C09K 8/5086 (2013.01); C08L 2205/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A polylactide resin composition comprising a melt- or solution-blend of
a) 70 to 95 weight percent, based on the weight of all polylactides in the composition, of at least one polymer or copolymer of meso-lactide having a number-average molecular weight as measured by gel permeation chromatography against a polystyrene standard of at least 5000 g/mol, wherein the polymer or copolymer of meso-lactide contains at least 90% by weight lactic units, at least 80% of the lactic units are formed by polymerizing meso-lactide and has an average length of blocks of L-lactic units and of D-lactic units equal to at least 1.1 and up to 2.0,
b) 5 to 30 weight percent, based on the weight of all polylactides in the composition, of at least one polylactide having a number-average molecular weight as measured by gel permeation chromatography against a polystyrene standard of at least 5000 g/mol and at least 95% by weight lactic units, and wherein the lactic units are L-lactic units and D-lactic units in a ratio of 86:14 to 92:8 or 8:92 to 14:86, and
c) 2-12% by weight of a linear or branched alkanoic acid having 8 to 18 carbon atoms based on the combined weight of the linear or branched alkanoic acid and all polylactides in the polylactide resin composition.