Polymer composition having delayed crystallization behavior, additive composition that influences the crystallization behavior, method for reducing the crystallization point and/or the crystallization speed, and use of an additive composition

A method for delaying crystallisation, for reducing the crystallisation speed, and/or for lowering the crystallisation temperature of a crystallisable, thermoplastic polymer, in which an additive composition is:

• added to a polymer matrix, comprising or consisting of at least one crystallisable, thermoplastic polymer, the polymer matrix is transferred into the melt and subsequently cooled, or
• incorporated in a polymer matrix in the molten state, comprising or consisting of at least one crystallisable, thermoplastic polymer, and subsequently is cooled;
• wherein the additive composition consists of or comprises:
• a) at least one azine dye and
• b) at least one mono-, bi-, tri- and/or tetravalent metal salt, selected from the group consisting of metal chlorides, metal bromides, and metal pseudohalogenides, and mixtures or combinations thereof.