	US 12,122,894 B2
	Use of rare earth amino acid complex, polylactic acid composition and preparation method thereof
Luya Cao, Baotou (CN); Hongzhang Cao, Baotou (CN); Dequan Han, Baotou (CN); Hui Wang, Baotou (CN); Huhu Tian, Baotou (CN); Xiaoli Yu, Baotou (CN); Tingting Lu, Baotou (CN); Xiaodong Zhou, Baotou (CN); and Liying Guo, Baotou (CN)
Assigned to Baotou Research Institute of Rare Earths, Baotou (CN)
Filed by Baotou Research Institute of Rare Earths, Baotou (CN)
Filed on Jun. 28, 2023, as Appl. No. 18/215,680.
Claims priority of application No. 202211113125.6 (CN), filed on Sep. 14, 2022.
Prior Publication US 2024/0084099 A1, Mar. 14, 2024
Int. Cl. C08K 5/00 (2006.01); C08J 3/20 (2006.01); C08L 67/04 (2006.01)

CPC C08K 5/0091 (2013.01) [C08J 3/203 (2013.01); C08L 67/04 (2013.01); C08J 2367/04 (2013.01); C08J 2491/00 (2013.01); C08L 2207/322 (2013.01)]

12 Claims

1. A method for increasing a softening temperature of polylactic acid, the method comprising:

mixing the polylactic acid with a rare earth amino acid complex and an additive to obtain a polylactic acid composition, the polylactic acid composition having a higher softening temperature than that of the polylactic acid, wherein:

the rare earth amino acid complex is a complex of a rare earth metal ion with an amino acid,

a rare earth element corresponding to the rare earth metal ion is at least one selected from the group consisting of lanthanum, cerium and samarium, and

the amino acid is at least one selected from the group consisting of L-phenylalanine, tyrosine and tryptophan.