Substituted 1-hydroxy-2,6-diaryl-4-piperidone ketals and polymer
申请人:Ciba-Geigy Corporation
公开号:US05235056A1
公开(公告)日:1993-08-10
1-Hydroxy-2,6-diaryl-4-piperidone ketal derivatives, such as the compound of formula I ##STR1## wherein Ar.sub.1 and Ar.sub.2 are each phenyl, R.sub.1 to R.sub.6 are all hydrogen, X.sub.1 and X.sub.2 are each --O-- and T is a direct bond, are novel compounds and are effective process stabilizers, such as polypropylene, for polymers processed at elevated tempertures providing both good melt flow stabilization and good resistance against discoloration during said processing.