FIELD: chemistry.
SUBSTANCE: invention relates to a composition of a crystallisation nucleator, a composition of a polyolefin-based resin, and a moulded product. The composition of a crystallisation nucleator includes a compound by the formula (1): 
wherein M constitutes a sodium atom, and a compound by the formula (1'): 
wherein M constitutes a hydrogen atom. The mass ratio between the phosphorus atoms and sodium atoms in the P/Na crystallisation nucleator is within the range of 1.350 to 1.500. The composition of a polyolefin-based resin for moulding comprises a composition of a crystallisation nucleator in an amount of 0.001 to 10 pts. wt. in relation to 100 pts. wt. of the polyolefin-based resin.
EFFECT: production of a composition of a crystallisation nucleator, improving transparency and heat resistance of the polyolefin resin.
4 cl, 2 tbl, 5 ex
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