Back to results
US 5,494,872 AGranted
Catalyst and solid catalyst component for preparing polyolefins with broad molecular weight distribution
AssigneeToho Titanium Co., Ltd.
InventorsMotoki Hosaka, Minoru Terano, Kazuhiro Ishii
Life of this patent
Estimating the term…
Abstract
A novel catalyst and solid catalyst component useful for preparing polyolefins having a broad molecular weight distribution and high stereoregularity.
Claims21
A catalyst for preparing polyolefins with a broad molecular weight distribution, consisting essentially of a solid catalyst component A1, an organic aluminum compound B1, and an organic silicon compound C1 having the formula:
- Si(C.sub.6 H.sub.11).sub.2 (OR.sup.0).sub.2
- wherein C.sub.6 H.sub.11 is a cyclohexyl group and R.sup.0 is a an alkyl group having 1 to 5 carbon atoms, said polyolefin has a molecular weight distribution of 6 or more, and wherein said solid catalyst component A1 is prepared by a process comprising the steps of:
- (i) suspending a dialkoxyl magnesium in an aromatic hydrocarbon,
- (ii) contacting and reacting said dialkoxyl magnesium with a diester of phthalic acid and titanium tetrachloride to obtain a solid material, washing said solid material with an aromatic hydrocarbon, and
- (iii) contacting said washed solid material with titanium tetrachloride.
2 more elements
A solid catalyst component A2 for olefin polymerization prepared by contacting together a Mg compound (a) represented by the following general formula (II):
- Mg(OR.sup.1).sub.2-m X.sub.m (II)
- wherein R.sup.1 indicates at least one selected from the group consisting of alkyl groups having 1 to 4 carbon atoms and phenyl groups, X is halogen atom such as chlorine, bromine or iodine and m is an integer of 0 or 1;
- a titanium compound (b) represented by the following general formula (III);
- Ti(OR.sup.2).sub.n X.sub.4-n (III)
- wherein R.sup.2 is an alkyl group having 1 to 4 carbon atoms, X is halogen atom such as chlorine, bromine or iodine and n is an integer of 0, 1 or 2;
- at least one diester of phthalic acid (c) represented by the following general formula (IV);
- .phi.(COOR.sup.3)(COOR.sup.4) (IV)
- wherein .phi. indicates a phenyl group. R.sup.3 and R.sup.4 each are an alkyl group having 1 to 4 carbon atoms and are identical with or different from each other;
- and
- at least one diester of phthalic acid (d) represented by the following general formula (V):
- .phi.(COOR.sup.5)(COOR.sup.6) (V)
- wherein R.sup.5 and R.sup.6 each are an alkyl group having 4 to 12 carbon atoms, in which the number of carbon atoms in total in R.sup.5 and R.sup.6 is 10 to 20, and are identical with or different from each other.
9 more elements
The solid catalyst component A2 as defined in claim 9, wherein said titanium compound (b) is titanium tetrahalide.
A catalyst system for olefin polymerization comprising:
- a solid catalyst component A2 prepared by contacting together a Mg compound (a) represented by the following general formula (II):
- Mg(OR.sup.1).sub.2-m X.sub.m (II)
- wherein R.sup.1 indicates at least one selected from the group consisting of alkyl groups having 1 to 4 carbon atoms and phenyl groups, X is a chlorine or a bromine, and m is an integer of 0 or 1;
- a titanium compound (b) represented by the following general formula (III);
- Ti(OR.sup.2).sub.n X.sub.4-n (III)
- wherein R.sup.2 is an alkyl group having 1 to 4 carbon atoms and n is an integer of 0, 1 or 2;
- at least one diester of phthalic acid (c) represented by the following general formula (IV);
- .phi.(COOR.sup.3)(COOR.sup.4) (IV)
- wherein .phi. indicates a phenyl group, R.sup.3 and R.sup.4 each are an alkyl group having 1 to 4 carbon atoms and may be identical with or different from each other;
- and
- at least one diester of phthalic acid (d) represented by the following general formula (V):
- .phi.(COOR.sup.5)(COOR.sup.6) (V)
- wherein R.sup.5 and R 6 each are an alkyl group having 4 to 12 carbon atoms, in which the number of carbon atoms in total is 10 to 20, and may be identical with or different from each other;
- a component B2 which is at least one organic aluminum compound represented by the following general formula (VI):
- R.sup.7.sub.y AlY.sub.3-y (VI)
- wherein R.sup.7 is an alkyl group having 1 to 4 carbon atoms, Y is any one of hydrogen, chlorine, bromine and iodine, and y is in the range of 0<y.ltoreq.3;
- and
- a component C2 which is at least one silicon compound represented by the following general formula (VII):
- R.sup.8.sub.z Si(OR.sup.9).sub.4-z (VII)
- wherein R.sup.8 is selected from the group consisting of an alkyl group, a cycloalkyl group, a phenyl group, a vinyl group, an aryl group and an aralkyl group and may be identical or different;
- R.sup.9 is selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group, a phenyl group, a vinyl group, an allyl group and an aralkyl group and may be identical or different;
- and z is an integer of 0 to 3.
19 more elements
Dependencies are inferred from the claim text.