Solid catalyst components for olefin polymerization,...

Details Solid catalyst components for olefin polymerization,... Solid catalyst components for olefin polymerization,...

2000-02-22

2001-12-18

Wu, David W. (Department: 1713)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C526S128000, C526S142000, C526S158000, C526S124100, C526S124300, C526S348000, C502S127000, C502S103000, C502S133000

Reexamination Certificate

active

06331620

ABSTRACT:

TECHNICAL FIELD
The present invention relates to solid catalyst components for olefin polymerization and catalysts for olefin polymerization, which are for producing homopolymers or copolymers of olefins through homopolymerization or copolymerization of ethylene and other &agr;-olefins, and also to processes for producing olefin polymers.
BACKGROUND OF THE INVENTION
Many solid catalyst components have heretofore been proposed, which comprise, as the essential catalyst ingredients, magnesium, titanium, halogens and electron donors. It is well known that these catalysts display high activity in olefin polymerization, and exhibit high stereospecificity in polymerization of &agr;-olefins. In particular, it is known that solid catalyst components comprising, as electron donors, aromatic esters such as typically phthalates have excellent catalytic capabilities. However, using aromatic compounds is often disliked because of their problems of safety and hygiene.
Using malonate derivatives as non-aromatic electron donors has been proposed. For example, in Japanese Patent Publication No. 80044/1992, proposed are compounds of a general formula (II):
wherein either one or both of R
3
and R
4
are linear or branched hydrocarbon groups each having 4 carbon atoms, or aromatic hydrocarbon groups. However, using the compounds does not provide satisfactory stereospecificity in polymer production. In Japanese Patent Laid-Open No. 122716/1994, proposed are compounds of formula (II) where R
3
and R
4
are bonded to each other to form a cyclic structure. In Japanese Patent Laid-Open No. 279517/1994, proposed are compounds of formula (II) where R
3
and R
4
are both hydrogen atoms; those where either one of R
3
and R
4
is a linear or branched hydrocarbon group having at least one carbon atom, or an aromatic hydrocarbon group, and where the other is a hydrogen atom; and those where both R
3
and R
4
are linear hydrocarbon groups each having at least 2 carbon atoms. However, using the compounds provides extremely poor yields of polymers. In Japanese Patent Laid-Open No. 157521/1996, proposed are compounds of formula (II) where both R
3
and R
4
are branched or cyclic hydrocarbon groups each having at least 3 carbon atoms. However, the malonates having such branched or cyclic hydrocarbon groups are difficult to produce, and, in addition, using them provides poor yields of polymers and is therefore impracticable. In Japanese Patent Laid-Open Nos. 124705/1991 and 168207/1991, using other non-aromatic diesters as electron donors is proposed. However, the non-aromatic diesters proposed are not always satisfactory for providing a high yields of stereospecific polymers.
The object of the present invention is to provide solid catalyst components for olefin polymerization, catalysts for olefin polymerization and processes for producing olefin polymers, for which are used, as electron donors, compounds having no problems of safety and hygiene. The compounds for electron donors are inexpensive and are easy to produce, and display high activity and high stereospecificity in olefin polymerization.
DISCLOSURE OF THE INVENTION
We, the present inventors have assiduously studied so as to attain the object as above, and, as a result, have found that using solid catalyst components for olefin polymerization, which comprise titanium, magnesium, and a compound of the following general formula (I) as an electron donor solves the problems noted above. On the basis of this finding, we have completed the present invention.
Specifically, the invention provides solid catalyst components for olefin polymerization, catalysts for olefin polymerization, and processes for producing olefin polymers, which are as follows:
(1) A solid catalyst component for olefin polymerization, comprising titanium, magnesium, and a compound of the following general formula (I) as an electron donor:
wherein R
1
and R
2
may be the same or different and each represents a linear or branched hydrocarbon group having from 1 to 20 carbon atoms; and n is an integer of from 1 to 10.
(2) A catalyst for olefin polymerization, comprising (A) the solid catalyst component for olefin polymerization of (1), and (B) an organoaluminium compound.
(3) A catalyst for olefin polymerization, comprising (A) the solid catalyst component for olefin polymerization of (1), (B) an organoaluminium compound, and (C) an electron-donating compound as the third component.
(4) The catalyst for olefin polymerization of (3), wherein the electron-donating compound for the third component (C) is an organosilicon compound.
(5) A process for producing olefin polymers, which comprises polymerizing olefins in the presence of the catalyst for olefin polymerization of any one of (2) to (4).


REFERENCES:
patent: 38 51 313 (1994-12-01), None
patent: 0 125 911 (1984-11-01), None
patent: 57-063310 (1982-04-01), None
patent: 58-138709 (1983-08-01), None
patent: 6-122716 (1994-05-01), None
patent: 6-279517 (1994-10-01), None
patent: 8-157521 (1999-06-01), None
patent: 11-199628 (1999-07-01), None
patent: WO 98/56830 (1998-12-01), None
patent: WO 98/56834 (1998-12-01), None
Derwent Publications, AN 96-3392111, JP 08-157521, Jun. 18, 1996.

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