Polybutylene terephthalate molding compositions which are resistant to heat-aging
AssigneeBASF SE
InventorsClaus Cordes, Hans-Josef Sterzel
Life of this patent
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Abstract
Stabilized polyester molding compositions in which the stabilizer is a carbodiimide of the formula ##STR1## where R is hydrogen, alkyl, halogen or nitro, at least one of the substituents R in the ortho-position to the carbodiimide group must differ from hydrogen, and the carbodiimide molecule contains, as substituents R, 2 alkyl groups and 2 nitro groups, or from 4 to 6 chlorine atoms, or 2 alkyl groups and from 4 to 6 chlorine atoms, or 2 chlorine atoms and 2 nitro groups, or 4 chlorine atoms and 2 bromine atoms.
Claims2
A stabilized polybutylene terephthalate molding composition wherein the stabilizer is a carbodiimide selected from the group consisting of 2,2'-dimethyl-4,4'-dinitrodiphenylcarbodiimide, 2,2',6,6'-tetrachlorodiphenylcarbodiimide and 2,2'-dinitro-4,4'-dichlorodiphenylcarbodiimide, and the amount of said carbodiimide is from 0.1 to 5 percent by weight, based on polybutylene terephthalate.
Dependencies are inferred from the claim text.