Propylene polymers for three-dimensional printing
AssigneeLummus Novolen Technology GmbH
InventorVolker Andreas Räntzsch
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Abstract
A propylene copolymer composition includes a propylene copolymer of propylene from 70 to 95 wt % and at least two α-olefin comonomers from 3.0 to 25 wt %. The α-olefin comonomer with a lower molar mass may be included from 0.3 to 10 wt %. The propylene copolymer composition may have a melt flow rate (MFR) in a range from 5.4 to 250 g/10 min, a polydispersity index (PI) in a range from 1.0 to 3.7, and an analytical temperature rising elution fractionation full width at half maximum (ATREF FWHM) in a range from 1.0 to 15.4° C. The method includes reacting propylene and at least two α-olefin comonomers in one or more vertically-stirred gas phase reactors, extruding with additives, and optionally visbreaking to produce a propylene copolymer composition.
Claims14
A propylene copolymer composition comprising:
- a propylene copolymer comprising:
- propylene in a range from 70 to 95 wt %;
- and
- at least two α-olefin comonomers in a range from 3.0 to 25 wt % as determined by Fourier Transform Infrared (FTIR) spectroscopy,
- wherein the at least two α-olefin comonomers are selected from a group consisting of ethylene, 1-butylene, 1-pentene, 1-hexene, 1-heptene, and 1-octene, and wherein the comonomer with a lower molar mass is in a range from 0.3 to 10 wt % as determined by FTIR;
- wherein the propylene copolymer composition has a melt flow rate (MFR) in a range from 5.4 to 250 g/10 min as determined in accordance with ISO 1133 at 230° C. and a load of 2.16 kg, a polydispersity index (PI) in a range from 1.0 to 3.7 as determined by a rheological oscillatory frequency sweep at 210° C., wherein PI=105 Pa/Gc and Gc=G′=G″ (cross-over modulus), an analytical temperature rising elution fractionation full width at half maximum (ATREF FWHM) in a range from 1.0 to 15.4° C. as determined by CRYSTAF-TREF in 1,2-dichlorobenzene by 1) cooling from 150 to 95° C. at −40° C./min, 2) maintaining 95° C. for 45 min, 3) cooling from 95° C. to 35° C. at −0.5° C./min, 4) maintaining 35° C. for 10 min, 5) heating from 35 to 140° C. at +1° C./min and evaluating the full width at half maximum (FWHM) of the peak between 35 to 140° C.
A method of making a propylene copolymer composition, the method comprising:
- reacting propylene and at least two α-olefin comonomers in one or more vertically-stirred gas phase reactors to produce a propylene copolymer;
- and
- extruding the propylene copolymer with additives and optionally visbreaking to produce a propylene copolymer composition;
- wherein the propylene copolymer composition has a melt flow rate (MFR) in a range from 5.4 to 250 g/10 min as determined in accordance with ISO 1133 at 230° C. and a load of 2.16 kg, a polydispersity index (PI) in a range from 1.0 to 3.7 as determined by a rheological oscillatory frequency sweep at 210° C., wherein PI=105 Pa/Gc and Gc=G′=G″ (cross-over modulus), an analytical temperature rising elution fractionation full width at half maximum (ATREF FWHM) in a range from 1.0 to 15.4° C. as determined by CRYSTAF-TREF in 1,2-dichlorobenzene by 1) cooling from 150 to 95° C. at −40° C./min, 2) maintaining 95° C. for 45 min, 3) cooling from 95° C. to 35° C. at −0.5° C./min, 4) maintaining 35° C. for 10 min, 5) heating from 35 to 140° C. at +1° C./min and evaluating the full width at half maximum (FWHM) of the peak between 35 to 140° C.
Dependencies are inferred from the claim text.