Propylene-based block copolymer particles
A technology of block copolymers and propylene copolymers, which is applied in the field of propylene-based block copolymers, can solve the problems of reduced impact resistance of molded products, and achieve the effects of excellent balance between rigidity and impact resistance, excellent appearance, and excellent appearance
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[0066] [0047] The titanium compound used in the preparation of the catalyst component (A) can be listed, for example, the general formula Yi(OR 1 ) a x 4-a (R 1represents a monovalent hydrocarbon group having 1 to 20 carbon atoms, X represents a halogen atom, and a represents a number of 0≦a≦4. ) represents a titanium compound. Specifically, titanium tetrahalide compounds such as titanium tetrachloride; alkoxytitanium trihalide compounds such as ethoxytitanium trichloride and butoxytitanium trichloride; diethoxytitanium dichloride, di Dialkoxytitanium dihalide compounds such as butoxytitanium dichloride; trialkoxytitanium monohalide compounds such as triethoxytitanium chloride and tributoxytitanium chloride; tetraethoxytitanium, Tetraalkoxytitanium compounds such as tetrabutoxytitanium. These titanium compounds may be used alone or in combination of two or more.
[0067] [0048] The magnesium compound used in the preparation of the catalyst component (A) includes, for exa...
Embodiment 1
[0126] [Preparation of solid catalyst]
[0127] The inside of a reaction vessel made of SUS with an internal volume of 200 liters was replaced with nitrogen. 80 liters of hexane, 6.55 mol of tetrabutoxytitanium, 2.8 mol of diisobutyl phthalate, and 98.9 mol of tetraethoxysilane were put into the container and stirred to obtain a solution. Next, 51 liters of a diisobutyl ether solution of butylmagnesium chloride having a concentration of 2.1 mol / liter was slowly added dropwise to the solution over 5 hours while maintaining the temperature in the reaction vessel at 5°C. After completion of the dropwise addition, stirring was carried out at room temperature for 1 hour, and solid-liquid separation was carried out at room temperature, followed by washing with 70 liters of toluene three times. After that, toluene was added so that the concentration of the slurry became 0.2 kg / liter, 47.6 mol of diisobutyl phthalate was added, and it was made to react at 95 degreeC for 30 minutes. ...
Embodiment 2
[0143] A slurry of a solid catalyst component and a prepolymerized catalyst component was prepared in the same manner as in Example 1, and using this slurry, four stages of propylene homopolymerization were performed in four reactors arranged in series to produce polypropylene particles. Thereafter, in the presence of the polypropylene particles, one-stage copolymerization of propylene and ethylene was performed to produce a propylene-based block copolymer particle group. Each polymerization process is demonstrated below.
[0144] [0091] [the first stage of propylene polymerization (liquid phase polymerization reaction)]
[0145] Homopolymerization of propylene was performed using a container-type reactor equipped with a stirrer with an inner volume of 40 liters. That is, a slurry of propylene, hydrogen, triethylaluminum, cyclohexylethyldimethoxysilane, and a prepolymerized catalyst component was continuously supplied to the reactor. The reaction conditions are: polymerizati...
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