US4587227A
Expired / Lapsed
US
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Ethylene polymers and chromium catalysts
Assignee: Phillips Petroleum Co
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Filing: 1984-08-13
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Granted: 1986-05-06
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Expires: 2004-08-13
Abstract
Abstract Olefin polymerization catalysts are described which are based on solid inorganic oxides (such as silica) and polychromium complexes (such as octakis(μ-trimethylsilylmethyl)tetrachromium(II)). Linear low density ethylene homopolymers with specific short chain branching as well as polymerization processes to make these polymers using the specific catalyst described are also disclosed.
Inventors
- 👤 Paul D. Smith
- 👤 Eric T. Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:35
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/24; H01Q15/242; B; B01; B01J; B01J31/00; B01J31/16; B01J31/1608; C; C07; C07F; C07F11/00; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
77 words
Process to produce an olefin polymerization catalyst comprising contacting a solid inorganic oxide support and a chromium compound have the formula Cr.sub.n (R).sub.2n wherein n is an integer of 3 or more; R is a ligand having the formula --CH.sub.2 --MR.sup.1 R.sup.2 R.sup.3 wherein M is C, Si, Ge, Sn or Pb; R 1 , R 2 , R 3 , which can be the same or different, are hydrocarbyl substituents consisting of carbon and hydrogen atoms.
Claim 2
Dependent Claim
77 words
Process to produce an olefin polymerization catalyst comprising contacting a solid inorganic oxide support and a chromium compound have the formula Cr.sub.n (R).sub.2n wherein n is an integer of 3 or more; R is a ligand having the formula --CH.sub.2 --MR.sup.1 R.sup.2 R.sup.3 wherein M is C, Si, Ge, Sn or Pb; R 1 , R 2 , R 3 , which can be the same or different, are hydrocarbyl substituents consisting of carbon and hydrogen atoms.
Claim 3
Dependent Claim
22 words
Process in accordance with claim 1 comprising contacting a silica-containing support which has activated catalytic hexavalent chromium sites with said chromium compound.
Claim 4
Dependent Claim
12 words
Process in accordance with claim 2 wherein said chromium compound is octakis(μ-trimethylsilylmethyl)tetrachromium(II).
Claim 5
Dependent Claim
8 words
Polymerization catalyst produced in accordance with claim 1.
Claim 6
Dependent Claim
8 words
Polymerization catalyst produced in accordance with claim 2.
Claim 7
Dependent Claim
8 words
Polymerization catalyst produced in accordance with claim 3.
Claim 8
Dependent Claim
71 words
Polymerization catalyst comprising a solid inorganic oxidic support and a chromium compound having the formula Cr.sub.n (R).sub.2n wherein n is an integer of 3 or more, R is a ligand having the formula --CH.sub.2 --MR.sup.1 R.sup.2 R.sup.3 wherein M is C, Si, Ge, Sn or Pb, R 1 , R 2 , R 3 , which can be the same or different, are hydrocarbyl substituents consisting of carbon and hydrogen atoms.
Claim 9
Dependent Claim
71 words
Polymerization catalyst comprising a solid inorganic oxidic support and a chromium compound having the formula Cr.sub.n (R).sub.2n wherein n is an integer of 3 or more, R is a ligand having the formula --CH.sub.2 --MR.sup.1 R.sup.2 R.sup.3 wherein M is C, Si, Ge, Sn or Pb, R 1 , R 2 , R 3 , which can be the same or different, are hydrocarbyl substituents consisting of carbon and hydrogen atoms.
Claim 10
Dependent Claim
24 words
Polymerization catalyst of claim 7 comprising 0.01 to 2 parts by weight of said chromium compound per 100 parts by weight of said support.
Claim 11
Dependent Claim
11 words
Polymerization catalyst in accordance with claim 7 wherein M is Si.
Claim 12
Dependent Claim
13 words
Polymerization catalyst in accordance with claim 7 wherein said chromium compound is octakis(μ-trimethylsilylmethyl)tetrachromium(II).
Claim 13
Dependent Claim
21 words
Polymerization catalyst in accordance with claim 8 wherein said support is a solid silica support containing activated hexavalent chromium catalytic sites.
Claim 14
Dependent Claim
13 words
A process in accordance with claim 1 wherein said chromium compound is octakis(μ-trimethylsilylmethyl)tetrachromium(II).
Claim 15
Dependent Claim
9 words
A polymerization catalyst produced in accordance with claim 12.
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