US4225690A
Expired / Lapsed
US
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Process and catalyst for producing high trans 1,4-polybutadiene
Assignee: Bridgestone Firestone Inc
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Filing: 1978-11-13
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Granted: 1980-09-30
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Expires: 1998-11-13
Abstract
Abstract The process disclosed herein comprises the use of a catalyst system comprising a complex of R2Mg.(ROK)2 in the hydrocarbon solution polymerization of 1,3-butadiene. Preferably the solvent is hexane, but cyclohexane or other alkane or cycloalkane may be used. The ratio of ROK to R2Mg is from 1.0/1 to 5/1 and the R2Mg and ROK are added separately to the butadiene solution. This process produces a high trans 1,4-polybutadiene which is particularly suitable as a coating for metals such as the coating of steel for beverage cans.
Inventors
- 👤 Adel F. Halasa
- 👤 James E. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:21
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/06
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
106 words
The process of polymerizing butadiene to a polymer having at least 80 percent trans-1,4 configuration comprising the addition of ROK and R 2 Mg to butadiene dissolved in an aliphatic or cycloaliphatic hydrocarbon wherein R represents a hydrocarbyl radical of 1-20 carbon atoms; said R 2 Mg being added in a proportion of 0.1-20 millimoles per one hundred grams of butadiene, said ROK being added in a proportion to give a K/Mg ratio in the range of 1.0/1 to 5/1; a temperature of -30° C. to 30° C. being maintained during said polymerization; and said polymerization being effected for a period of at least 30 minutes.
Claim 2
Dependent Claim
106 words
The process of polymerizing butadiene to a polymer having at least 80 percent trans-1,4 configuration comprising the addition of ROK and R 2 Mg to butadiene dissolved in an aliphatic or cycloaliphatic hydrocarbon wherein R represents a hydrocarbyl radical of 1-20 carbon atoms; said R 2 Mg being added in a proportion of 0.1-20 millimoles per one hundred grams of butadiene, said ROK being added in a proportion to give a K/Mg ratio in the range of 1.0/1 to 5/1; a temperature of -30° C. to 30° C. being maintained during said polymerization; and said polymerization being effected for a period of at least 30 minutes.
Claim 3
Dependent Claim
16 words
The process of claim 1 in which R represents an alkyl radical of 3-6 carbon atoms.
Claim 4
Dependent Claim
20 words
The process of claim 1 in which the R in said ROK is an alkyl radical of 3-6 carbon atoms.
Claim 5
Dependent Claim
13 words
The process of claim 3 in which said R represents an amyl radical.
Claim 6
Dependent Claim
13 words
The process of claim 4 in which said R represents the tertiary-amyl radical.
Claim 7
Dependent Claim
25 words
The process of claim 1 in which the two R radicals in each said R 2 Mg represents an alkyl radical of 3-6 carbon atoms.
Claim 8
Dependent Claim
13 words
The process of claim 6 in which said R radicals are butyl radicals.
Claim 9
Dependent Claim
13 words
The process of claim 6 in which said R radicals are n-butyl radicals.
Claim 10
Dependent Claim
13 words
The process of claim 6 in which said R radicals are sec-butyl radicals.
Claim 11
Dependent Claim
14 words
The process of claim 1 in which said R 2 Mg is n-butyl-sec-butyl magnesium.
Claim 12
Dependent Claim
13 words
The process of claim 1 in which said hydrocarbon is an aliphatic hydrocarbon.
Claim 13
Dependent Claim
17 words
The process of claim 11 in which said hydrocarbon is an aliphatic hydrocarbon of 5-10 carbon atoms.
Claim 14
Dependent Claim
11 words
The process of claim 11 in which said hydrocarbon is hexane.
Claim 15
Dependent Claim
11 words
The process of claim 11 in which said hydrocarbon is heptane.
Claim 16
Dependent Claim
11 words
The process of claim 1 in which said hydrocarbon is cyclohexane.
Claim 17
Dependent Claim
18 words
The process of claim 12 in which said K/Mg ratio is in the range of 1.2/1 to 4/1.
Claim 18
Dependent Claim
12 words
The process of claim 16 in which said temperature is 0-30° C.
Claim 19
Dependent Claim
22 words
The process of claim 17 in which the R groups in said R 2 Mg are alkyl groups of 3-6 carbon atoms.
Claim 20
Dependent Claim
28 words
The process of claim 17 in which both R groups in said R 2 Mg are butyl groups selected from the class consisting of n-butyl and sec-butyl groups.
Claim 21
Dependent Claim
20 words
The process of claim 19 in which the R in said ROK is an alkyl group of 3-6 carbon atoms.
Claim 22
Dependent Claim
10 words
The process of claim 19 in which ROK is K-O-t-amylate.
Claim 23
Dependent Claim
13 words
The process of claim 21 in which the K/Mg ratio is approximately 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |