Ethylene-propylene copolymer, and polypropylene resin composition comprising the same
A propylene copolymer, polypropylene technology, applied in the field of ethylene-propylene copolymer, can solve the problem that stiffness and impact resistance are not necessarily sufficient
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[0074] The polymerization catalyst used in the production process of the ethylene-propylene copolymer of the present invention is obtained by bringing the solid catalyst component into contact with an organoaluminum compound, wherein an electron donor may optionally be added to contact them.
[0075] The organoaluminum compound is a compound having one or more aluminum-carbon bonds in its molecule, and is preferably a trialkylaluminum, a mixture of a trialkylaluminum and a dialkylaluminum halide, or an alkylaluminoxane, And particularly preferred is triethylaluminum, triisobutylaluminum, a mixture of triethylaluminum and diethylaluminum chloride, or tetraethyldialuminoxane.
[0076] Examples of said electron donors are oxygen-containing compounds, nitrogen-containing compounds, phosphorus-containing compounds and sulfur-containing compounds. Among these, preferred are oxygen-containing compounds or nitrogen-containing compounds.
[0077] Examples of oxygenates are silicon alk...
Embodiment
[0107] The present invention is explained by the following Examples and Comparative Examples.
[0108] Various structural values of the ethylene-propylene copolymers in Preparation Examples 1-4 were measured according to the following methods.
[0109] (1) Propylene content (unit: mol%)
[0110] It is based on M. De Pooter et al., Journal of Applied Polymer Science, 42 , pp. 399-408, described in U.S.A., 1991 according to 13 C-NMR spectrum is measured under the following conditions:
[0111] - Device: JNM-EX 270 manufactured by JEOL LTD;
[0112] - Probe diameter: 10mmφ;
[0113] - solvent: o-dichlorobenzene;
[0114] - Temperature: 135°C;
[0115] - Sample concentration: 5wt%;
[0116] - pulse width: 45;
[0117] - Repeat time: 10 seconds; and
[0118] - Cumulative times: 2500.
[0119] (2) Monomer reactivity rate (r1r2)
[0120] It was obtained by measurement under conditions similar to those in (1) above, and based on the disclosure in Kakugo et al., Macromolec...
preparation example 1
[0166] (1) Synthesis of solid catalyst component precursor
[0167] The 200 L reactor equipped with stirrer and baffles was purged with nitrogen. 80 L of hexane, 20.6 kg of tetraethoxysilane, and 2.2 kg of tetrabutoxytitanium were put into the reactor, and the resulting mixture was stirred. Subsequently, the reactor was kept at 5° C., and 50 L of a dibutyl ether solution of butylmagnesium chloride (concentration: 2.1 mol / L) was added dropwise to the mixture within 4 hours. After the dropwise addition was completed, the mixture was stirred at 5°C for 1 hour, and further stirred at 20°C for 1 hour. The reaction mixture was filtered and the resulting solid was washed three times with 70 L of toluene each. To the solid was added 63 L of toluene, whereby a toluene slurry was obtained. A part of the slurry was sampled, subjected to solvent removal and then dried, thereby obtaining a solid catalyst component precursor.
[0168] The solid catalyst component precursor was found to ...
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