# US 4,400,303 A · Catalyst for olefin polymerization

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- Number: US 4,400,303 A
- Document ID: US4400303A
- Status: Granted
- Kind: A
- Application number: 06/241,975
- Filed: 1981-03-09
- Granted: 1983-08-23
- Earliest claimed: 1981-03-09
- Assignees: Phillips Petroleum Company
- Inventors: Joel L. Martin
- Web page: https://patentgrep.com/patent/US4400303A

## CPC

- C08F 10/02: Ethene
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A process for polymerizing ethylene using a catalyst component prepared by pretreating a magnesium dihalide with selected organic oxy compounds and then reacting the pretreated magnesium dihalide with a halogenated titanium compound.

## Claims

### Claim 1

A catalyst for the polymerization of monomers comprising ethylene comprising the product produced by
(1) pretreating solid particles of magnesium dihalide by pulverizing said particles in the presence of at least one oxy compound of the formula
RR'C(OR").sub.2
wherein R is selected from hydrogen, alkyl radicals having 1 to 4 carbon atoms, and halogenated alkyl radicals having 1 to 4 carbon atoms; wherein R' is selected from hydrogen, alkyl radicals containing 1 to 4 carbon atoms, halogenated alkyl radicals containing 1 to 4 carbon atoms, and OR"; wherein each R" is individually selected from alkyl radicals having 1 to 4 carbon atoms; and then
(2) reacting said pretreated solid particles with a halogenated titanium compound of the formula TiX.sub.n (OR"').sub.4-n wherein R"' is a hydrocarbyl radical containing 1 to 12 carbon atoms, X is a halogen, and n is an integer of 1 to 4.

### Claim 2 (depends on 1)

A catalyst according to claim 1 wherein each said oxy compound is selected from the group consisting of trimethoxymethane; triethoxymethane; triisopropoxymethane; tri-n-butoxymethane; 1,1,1-trimethoxyethane; 1,1,1-trimethoxypropane; 1,1,1-triethoxybutane; 1,1,1-tri-n-butoxy-n-pentane; 1,1-diethoxy-2-chloroethane; 1,1-diethoxyethane; dimethoxymethane; 1,1-dimethoxyethane; diethoxymethane; 1,1-di-n-butoxyethane; di-n-butoxymethane; 2,2-diethoxypropane; 3,3-dipropoxy-n-pentane, and 2,2-dimethoxypropane.

### Claim 3 (depends on 1)

A catalyst according to claim 1 wherein said magnesium dihalide is pretreated with at least one oxy compound of the formula
RC(OR").sub.3
wherein R is selected from hydrogen and alkyl radicals having 1 to 4 carbon atoms and each R" is individually selected from alkyl radicals containing 1 to 4 carbon atoms.

### Claim 4 (depends on 3)

A catalyst according to claim 3 wherein titanium tetrachloride is employed as at least part of the halogenated titanium compound.

### Claim 5 (depends on 4)

A catalyst according to claim 4 wherein said magnesium halide consists essentially of magnesium dichloride.

### Claim 6 (depends on 5)

A catalyst according to claim 5 wherein said oxy compound is selected from triethoxymethane, 1,1,1-triethoxypropane, 1,1,1-triethoxyethane, and trimethoxymethane.

### Claim 7 (depends on 6)

A catalyst according to claim 6 wherein said halogenated titanium compound consists essentially of titanium tetrachloride and said oxy compound consists essentially of triethoxymethane.

### Claim 8 (depends on 7)

A catalyst according to claim 7 wherein the molar ratio of said magnesium dichloride to said oxy compound is in the range of about 0.5/1 to about 100/1 and the mole ratio of titanium tetrachloride to magnesium dichloride is in the range of about 10/1 to 0.005/1.

### Claim 9 (depends on 8)

A catalyst according to claim 8 wherein about 2 mL of said oxy compound is employed for every 10 grams of magnesium dichloride.

### Claim 10 (depends on 9)

A catalyst according to claim 9 wherein said pulverization is conducted at atmospheric pressure and a temperature in the range of 25.degree. C. to 75.degree. C.

### Claim 11 (depends on 10)

A catalyst according to claim 10 wherein said pretreated solid particles are reacted with said titanium tetrachloride at atmospheric pressure and a temperature in the range of about 20.degree. C. to about 80.degree. C.

### Claim 12 (depends on 1)

A catalyst according to claim 1 wherein said oxy compound comprises at least one oxy compound selected from the defined oxy compounds other than ethyl orthoacetate and methyl orthoacetate.

### Claim 13 (depends on 5)

A catalyst according to claim 5 wherein said oxy compound comprises triethoxymethane.

### Claim 14 (depends on 2, 11)

A polymerization catalyst system comprising a catalyst of claims 2, 11, or 12, 13 in combination with a cocatalyst comprising an organometallic compound of a metal of Groups I, IIA, and IIIA of the Periodic Table.