| abstract |
Substituted 1-oxy-4-acyloxypiperidines or 1-oxy-4-acylaminopiperidines of formula In n wherein R₁, R₂, R₃ and R₄ are independently hydrogen, alkyl or substituted alkyl, R₅ is hydrogen, alkyl, cycloakyl, allyl or benzyl, X is -O- or -NE-, E is hydrogen, akyl or cycloakyl, A is an n-valent aliphatic or aromatic hydrocarbon radical, and n is 1 to 4 are effective in providing melt flow stabilization to polymeric materials during processing. |