Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1998-10-07
2000-10-24
Gupta, Yogendra
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502108, 502117, 526114, 526116, 526119, 525268, 525270, C08F 4653, C08F 4646
Patent
active
061367435
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE ART
The present invention concerns olefin polymerization catalysts and olefin polymerization methods using the catalysts and also concerns olefin polymer compositions and heat molded products. To be more specific, the present invention concerns new olefin polymerization catalysts that exhibit high polymerization activity and enable the obtaining of olefin copolymers of wide molecular weight distribution and olefin polymerization methods using the catalysts, and also concerns olefin polymer compositions having excellent mechanical properties as well as excellent molding properties (moldability), and heat molded products obtained by heat molding the compositions.
BACKGROUND ART
Titanium catalysts which comprise a solid titanium catalyst component containing magnesium, titanium, halogen, and if necessary, an electron donor, and an organic aluminum compound, and vanadium catalysts which comprise a vanadium compound and an organic aluminum compound, have conventionally been known as catalysts for producing olefin polymers such as ethylene polymers, propylene polymers, ethylene-.alpha.-olefin copolymers, etc. Also, Ziegler catalysts comprising a metallocene compound such as zirconocene, and an organic aluminum oxycompound (aluminoxane), have been known as catalysts that can be used to manufacture olefin polymers with a high polymerization activity. Furthermore, olefin polymerization catalysts comprising a nickel compound or a palladium compound and a cocatalyst such as aluminoxane, an ionic compound, etc., have been proposed recently as new olefin polymerization catalysts (J. Am. Chem. Soc. 1995, 117, 6414-6415).
Ethylene polymers, propylene polymers, and other olefin polymers are used as molding materials for various needs due to their excellent properties such as mechanical strength, heat resistance, transparency, chemical resistance, etc. Such olefin polymers are thus required to have good molding properties (moldability).
However, though the above-mentioned catalysts comprising a nickel compound or palladium compound and a cocatalyst exhibit high polymerization activity, the olefin polymers obtained using the catalysts are narrow in molecular weight distribution and thus do not necessarily have good molding properties (moldability). Improved catalysts comprising a nickel compound or palladium compound and cocatalyst which can produce olefin polymers of wide molecular distribution and excellent molding properties (moldability), without decreasing the high polymerization activity, have thus been desired.
Olefin polymers having excellent physical properties mentioned above are desired for use in a wide range of applications, and the desired physical properties differ according to the application. For example, in producing films from an olefin polymer, the olefin polymer requires excellent melt tension in order to prevent drawdown, etc., and the resulting films require good impact resistance, heat resistance, etc.
Furthermore, physical properties of olefin polymers are modified according to application. For example, propylene block copolymers, having both a crystalline polypropylene component and a rubber component, are known as materials that provide improvement in the impact resistance of crystalline polypropylenes. Japanese laid-open patent publication No. 4-337308 discloses a method of producing polypropylene block copolymers that exhibit an excellent balance of impact resistance and rigidity by the use of catalysts containing a silylene group bridge type metallocene compound as a catalytic component.
There are also known methods of forming polypropylene compositions by blending a rubber material such as non-crystalline polyethylene, non-crystalline or low-crystalline ethylene-propylene random copolymer, polyisobutylene or polybutadiene, as an impact resistance modifier, in crystalline polypropylene. For example, Japanese laid-open patent publication No. 5-202152 discloses a method of obtaining a polypropylene molding material of excellent low-temperature impact strength from a cry
REFERENCES:
patent: 5145818 (1992-09-01), Tsutsui et al.
patent: 5840808 (1998-11-01), Sugimura et al.
L.K.Johnson et al., "New Pd(II)-and Ni(II)-Based Catalysts for Polymerization of Ethylene and .alpha.-Olefins", J. Am. Cem. Soc., 1995, 117, pp. 6414-6415.
Hayashi Tetsuo
Matsunaga Shin-ya
Sugimura Kenji
Suzuki Yasuhiko
Yorozu Kiyotaka
Gupta Yogendra
Hamlin Derrick G.
Mitsui Chemicals Inc.
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