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Patent Searching and Data


Title:
CRYSTALLIZATION OF POLYPROPYLENE USING A SEMI-CRYSTALLINE, BRANCHED OR COUPLED NUCLEATING AGENT
Document Type and Number:
WIPO Patent Application WO2003040095
Kind Code:
A3
Abstract:
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) 13 C 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.

Inventors:
STEVENS JAMES C (US)
VANDERLENDE DANIEL D (US)
ANSEMS PATRICIA (US)
Application Number:
PCT/US2002/035715
Publication Date:
September 12, 2003
Filing Date:
November 05, 2002
Export Citation:
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Assignee:
DOW GLOBAL TECHNOLOGIES INC (US)
STEVENS JAMES C (US)
VANDERLENDE DANIEL D (US)
ANSEMS PATRICIA (US)
International Classes:
B32B27/32; C07F7/00; C08F110/06; C08J5/18; C08L23/10; C08L23/12; C08L23/14; C08F4/6592; C08L23/02; C08L23/16; C08L101/00; (IPC1-7): C08L23/10
Foreign References:
EP0369658A21990-05-23
US5641828A1997-06-24
EP0496260A21992-07-29
EP0651012A11995-05-03
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