Patent ID: 6911517

Claim:
A method for nucleating syndiotactic polypropylene comprising the steps of: (a) providing a thermoplastic formulation comprising syndiotactic polypropylene; (b) introducing at least one nucleating agent therein, wherein said at least one nucleating agent exhibits nucleation properties within syndiotactic polypropylene such that it induces a crystallization temperature of at least 71° C. for a thermoplastic formulation comprising from 70-75% by weight of syndiotactic polypropylene, when analyzed under a modified ASTM Test Method D-794-85 wherein the cooling rate is 20° C. /min and such that the syndiotactic polypropylene comprises a combination of Cell II crystal structures and Cell III crystal structures, wherein the Cell II/Cell III content ratio is at least 45/55 as analyzed under a modified Test Method D-794-85 wherein the cooling rate is 20° C./min; and (c) allowing the resultant formulation of step “b” to cool.