06927256 is referenced by 26 patents and cites 173 patents.

A method of nucleating a propylene homo- or copolymer, the method comprising contacting the propylene polymer with a semi-crystalline branched or coupled polymeric nucleating agent under nucleation conditions. In one embodiment, the propylene homopolymer is characterized as having 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity. In another embodiment, the copolymer is characterized as comprising at least about 60 weight percent (wt %) of units derived from propylene, and as having at least one of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a B-value greater than about 1.4 when the comonomer content, i.e., the units derived from ethylene and/or the unsaturated comonomer(s), of the copolymer is at least about 3 wt %, (iii) a skewness index, Six, greater than about −1.20, (iv) a DSC curve with a Tme that remains essentially the same and a Tmax that decreases as the amount of comonomer, i.e., the units derived from ethylene and/or the unsaturated comonomer(s), in the copolymer is increased, and (v) an X-ray diffraction pattern that reports more gamma-form crystals than a comparable copolymer prepared with a Ziegler-Natta (Z-N) catalyst.

Title
Crystallization of polypropylene using a semi-crystalline, branched or coupled nucleating agent
Application Number
10/289145
Publication Number
6927256 (B2)
Application Date
November 5, 2002
Publication Date
August 9, 2005
Inventor
Patricia Ansems
West Columbia
TX, US
Daniel D Vanderlende
Sugarland
TX, US
James C Stevens
Richmond
TX, US
Agent
Whyte Hirschboeck Dudek SC
Assignee
Dow Global Technologies
MI, US
IPC
C08F 210/16
C08F 010/00
C07F 009/6568
C07F 017/00
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C08F 004/64
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