FIELD: polymers.
SUBSTANCE: invention relates to an additive composition as a nucleating agent for a thermoplastic polymer, containing one or more salts of calcium cis-1,2-cyclohexanedicarboxylate, wherein among the salts of calcium cis-1,2-cyclohexandicarboxylate present in the additive composition, 25 mol % or more constitute calcium cis-1,2-cyclohexandicarboxylate monohydrate, and the additive composition has a gravimetric water content of 20% or less.
EFFECT: demand for nucleating substances suitable for producing thermoplastic polymer compositions exhibiting, in a more favourable combination, a high maximum polymer recrystallisation temperature, low and isotropic compression, and high rigidity, exists; the additive compositions, polymer compositions and methods for production thereof described herein are intended to satisfy this demand.
20 cl, 4 tbl, 1 ex
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