Claims
- 1. The process for the hydrocarbon solution polymerization of a monomer composition containing at least 70 percent by weight of a conjugated diene comprising the steps of maintaining said monomer at a temperature of 0.degree.-150.degree. C. and in intimate contact with the catalyst composition comprising
- (a) a dihydrocarbyl magnesium compound in which the hydrocarbyl radicals have 1-10 carbon atoms selected from the class consisting of alkyl, carbocyclic aryl and cycloalkyl radicals, and
- (b) an alkali metal compound of the formula R(SM).sub.n or RC.tbd.CM, wherein M represents Li, Na, or K; R represents a hydrocarbyl radical of 1-10 carbon atoms; and n represents 1, 2, or 3;
- the concentrations of the respective components giving an Mg/alkali metal molar ratio of 0.01/1 to 100/1, said magnesium compound being present in a concentration of 0.1-10 millimoles per 100 grams of monomer.
- 2. The process of claim 1 in which the concentrations of the respective components gives an M.sub.g /alkali metal molar ratio of 0.5/1 to 50/1.
- 3. The process of claim 2 in which said alkali metal compound is an alkali metal hydrocarbyl sulfide.
- 4. The process of claim 2 in which said alkali metal compound is a lithium alkyl sulfide.
- 5. The process of claim 2 in which said alkali metal compound is a sodium alkyl sulfide.
- 6. The process of claim 2 in which said alkali metal compound is a potassium alkyl sulfide.
- 7. The process of claim 3 in which said magnesium compound is a dialkyl magnesium.
- 8. The process of claim 7 in which said alkyl groups are butyl groups.
- 9. The process of claim 7 in which said dialkyl groups are amyl groups.
- 10. The process of claim 1 in which said diene is butadiene-1,3.
- 11. The process of claim 1 in which said monomer composition is substantially all butadiene-1,3.
- 12. The process of claim 11 in which said concentration of magnesium compound is 0.33-50 millimoles per 100 grams of monomer.
- 13. The process of claim 12 in which said alkali metal compound is an alkali metal sulfide and said temperature is in the range of 25.degree.-100.degree. C.
- 14. The process of claim 12 in which said alkali metal compound is a lithium alkyl sulfide.
Parent Case Info
This is a division of application Ser. No. 848,958 filed Nov. 7, 1977.
US Referenced Citations (16)
Divisions (1)
|
Number |
Date |
Country |
Parent |
848958 |
Nov 1977 |
|