BASF said in a statement it had completed the sale of its shares in Markor Chemical Manufacturing and Markor Meiou Chemical to the Singaporean group Verde Chemical.
The German group gave no financial details of the transaction, which was completed on Monday "following approval by the relevant authorities".
BASF had said in February 2024 it would accelerate its divestment from the joint ventures which manufacture the industrial chemical butanediol.
Plans to sell the shares had already been announced by BASF in 2023 in response to commercial and environmental concerns.
German public broadcaster ZDF and news magazine Der Spiegel had reported that staff of BASF's partner firm Markor were involved in rights abuses against members of the mostly Muslim Uyghur minority.
Employees were alleged to have spied on Uyghur families and filed reports with Chinese authorities.
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