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AssigneeDow Global Technologies LLC
InventorsJames C. Stevens, Daniel D. Vanderlende, Patricia Ansems
Estimating the term…
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.
A method of nucleating a propylene copolymer having a maximum crystallinity of about 43% and comprising at least about 60 wt % of the units derived from propylene, and between about 3 and 40 wt % the units derived from the unsaturated comonomer, the copolymer further characterized as having at least one of the following properties:
A blend of a (a) propylene copolymer having a maximum crystallinity of about 43% and comprising at least about 60 wt % of units derived from propylene, about 3–35 wt % of units derived from ethylene, and 0 to about 35 wt % of units derived from one or more unsaturated comonomers, with the proviso that the combined weight percent of units derived from ethylene and the unsaturated comonomer does not exceed about 40, the copolymer further characterized as having at least one of the following properties:
A blend of a (a) propylene copolymer having a maximum crystallinity of about 43% and comprising at least about 60 wt % of units derived from propylene, and between about 3 and 40 wt % the units derived from the unsaturated comonomer, the copolymer further characterized as having at least one of the following properties:
Dependencies are inferred from the claim text.