Patent US4033900A successfully refreshed from Google Patents.
US4033900A
Expired / Lapsed
US
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Composition useful in anionic polymerization
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1976-04-23
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Granted: 1977-07-05
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Expires: 1996-04-23
Abstract
Abstract This invention relates to the preparation of solution polymers and rubbers from vinyl monomers using a new catalyst complex of a barium di-tert-alkoxide-hydroxide salt and ann organic lithium compound. In particular, homopolymers and copolymers of butadiene with styrene and/or isoprene, prepared with this catalyst, are uniquely characterized by the butadiene units having a low vinyl content (not over about 12%) and a trans-1,4 structure of from about 70 to 81%. Also, the copolymer has a random comonomer sequence distribution. This molecular structure permits elastomers containing little or no styrene to have sufficient stereoregularity to crystallize. Furthermore, the butadiene homopolymer and copolymer with styrene and/or isoprene exhibit a broad molecular weight distribution as well as tack and green-strength which are valuable properties for a rubber to possess when building tires.
Inventors
- 👤 Ivan Glen Hargis
- 👤 Russell Anthony Livigni
- 👤 Sundar Lal Aggarwal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:02
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
A composition of matter useful in anionic polymerization and comprising a complex of (1) ##STR5## where at least one R is a methyl or cyclohexyl radical and where the remaining Rs are selected from the group consisting of alkyl and cycloalkyl radicals having from 1 to 6 carbon atoms which may be the same or different and where the mol ratio of a to b is from about 99.5:0.5 to 88:12 and (2) R'Li in which R' is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals having from 2 to 20 carbon atoms, the mol ratio of (1) to (2), based on barium metal and lithium metal, being from about 0.30:1 to 0.75:1.
Claim 2
Dependent Claim
119 words
A composition of matter useful in anionic polymerization and comprising a complex of (1) ##STR5## where at least one R is a methyl or cyclohexyl radical and where the remaining Rs are selected from the group consisting of alkyl and cycloalkyl radicals having from 1 to 6 carbon atoms which may be the same or different and where the mol ratio of a to b is from about 99.5:0.5 to 88:12 and (2) R'Li in which R' is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals having from 2 to 20 carbon atoms, the mol ratio of (1) to (2), based on barium metal and lithium metal, being from about 0.30:1 to 0.75:1.
Claim 3
Dependent Claim
27 words
A composition according to claim 1 where the mol ratio of (1) to (2), based on barium metal and lithium metal, is from about 0.35:1 to 0.60:1.
Claim 4
Dependent Claim
20 words
A composition according to claim 1 in which the mol ratio of (1) to (2) is about 0.50 to 1.
Claim 5
Dependent Claim
26 words
A composition according to claim 1 in which the Rs are methyl radicals and R' is an alkyl radical of from 2 to 10 carbon atoms.
Claim 6
Dependent Claim
21 words
A composition according to claim 1 in which the mol ratio of a to b is from about 97.5:2.5 to 90:10.
Claim 7
Dependent Claim
11 words
A composition according to claim 1 in which R' is butyl.
Claim 8
Dependent Claim
14 words
A composition of matter according to claim 1 dissolved in an aromatic hydrocarbon solvent.
Claim 9
Dependent Claim
35 words
A composition of matter according to claim 7 in which said aromatic hydrocarbon solvent does not have a very labile carbon-hydrogen bond and which does not act at least substantially as a chain terminating agent.
Claim 10
Dependent Claim
18 words
A composition of matter according to claim 7 which has been aged for from 1 to 24 hours.
Claim 11
Dependent Claim
18 words
A composition of matter according to claim 8 which has been aged for from 15 to 30 minutes.
Claim 12
Dependent Claim
40 words
A composition of matter according to claim 1 wherein (1) and (2) have been complexed or reacted under inert conditions at a temperature of from about 25° to 100° C. for a period of time sufficient to form said complex.
Claim 13
Dependent Claim
18 words
A composition of matter according to claim 11 wherein said temperature is from about 40° to 60° C.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |