Patent ID: 6989154

Claim:
A solid polyolefin article comprising: (a) a polyolefin, said polyolefin being selected from the group consisting of: polypropylene, polyethylene, polybutylene, and blends or copolymers thereof; (b) a nucleator composition comprising at least 1000 ppm of a mixture of compounds, said mixture of compounds comprising: i) bis(3,4-dimethylbenzylidene) sorbitol and ii) bis(p-methylbenzylidene) sorbitol; (c) wherein said nucleator composition provides a crystallization onset temperature within a target polyolefin article formulation above the crystallization onset temperature provided for a comparative polyolefin article comprising the same polyolefin formulation but comprising bis(p-methylbenzylidene) sorbitol as its sole polyolefin nucleator component, (d) wherein the concentration of said sole polyolefin nucleator component bis(p-methylbenzylidene) sorbitol within said comparative polyolefin article is equivalent to the total concentration of the polyolefin nucleator mixture within said target polyolefin article.