Expandable, thermoplastic polymer particles based on styrene polymers and process for the preparation thereof

Expandable, thermoplastic polymer particles containing:

• A) 87% to 99% by weight, based on the total weight of (A), (B), and (C), of one or more styrenic polymers (A), wherein at least one of the one or more styrenic polymers (A) is not a styrene homopolymer;
• B) 1% to 10% by weight, based on the total weight of (A), (B), and (C), of one or more blowing agents (B);
• C) 0% to 3% by weight, based on the total weight of (A), (B), and (C), of one or more nucleators or nucleating agents (C);
• and
• optionally one or more further additives (Z) in an amount that does not impair domain formation and the foam structure resulting therefrom;
• wherein the expandable, thermoplastic polymer particles contain no further polymers in addition to the one or more styrenic polymers (A);
• wherein the one or more styrenic polymers (A) are miscible with one another if the expandable, thermoplastic polymer particles contain two or more styrenic polymers (A);
• and
• wherein the expandable, thermoplastic polymer particles are thermoplastically recyclable.