FIELD: chemistry.
SUBSTANCE: present invention relates to expandable polymer compositions comprising vinyl aromatic polymers and / or copolymers having increased flexibility and to a process for preparing such compositions. Described is an expandable polymer composition which includes: a) vinyl aromatic polymers and / or copolymers in an amount of 50 to 99% by weight, based on the total weight of the composition; b) a polyolefin or corresponding copolymer containing an ester in an amount of 1 to 50% by weight, based on the total weight of the composition; c) an olefin elastomer on which the vinyl aromatic polymer is grafted, in an amount of 0.01 to 40% by weight, based on the total weight (a) + (b); d) an expanding agent in an amount of 1 to 10% by weight, based on the total weight (a) + (b) + (c). Also described is a process for producing an expandable composition in a continuous mass.
EFFECT: technical result: obtaining an expandable polymer composition having a long shelf life, low losses of expanding agent and ease of processing, resulting in low densities.
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