method for preparing a composition by mixing a macromoleculair material with a bis - imide formed product, wholly or partly from this material exists.and method for the preparation of bis - imiden.

摘要

Flame retardants having good stability at the processing temperatures of high melting polymers are described. The flame retardants are halogen- containing bis-imides, for example, those of the formula ##STR1## R and X being defined in the specification.