US4020115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline barium alcoholates
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1976-04-23
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Granted: 1977-04-26
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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 an 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
2026-11-08 16:03
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/68; C07C29/70; C07C31/00; C07C31/28; C07C31/30; C07F; C07F3/00; C07F3/003; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F36/00; C08F36/02; C08F36/04; C12; C12C; C12C11/00; C12C11/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
62 words
A compound having the formula ##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.
Claim 2
Dependent Claim
62 words
A compound having the formula ##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.
Claim 3
Dependent Claim
20 words
A compound according to claim 1 where the mol ratio of a to b is from about 97.5:2.5 to 90:10.
Claim 4
Dependent Claim
12 words
A compound according to claim 2 where the Rs are methyl radicals.
Claim 5
Dependent Claim
12 words
A compound according to claim 1 dissolved in an aromatic hydrocarbon solvent.
Claim 6
Dependent Claim
33 words
A compound according to claim 4 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 7
Independent Claim
200 words
The method for making a compound having the formula ##STR6## 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 which comprises under an inert atmosphere reacting barium metal in liquid NH 3 or amine solvent for said barium with a tertiary carbinol having the formula ##STR7## where R is the same as defined about and H 2 O, the mol ratio of said carbinol to H 2 O being from about 99.5:0.5 to 88:12, the temperature during reaction being from about -100° C. up to the boiling point of the solvent, said amine being selected from the group consisting of saturated non-chelating non-polymerizable aliphatic, cycloaliphatic and heterocyclic primary and secondary monoamines and polyamines and mixtures of the same having from 1 to 12 carbon atoms and from 1 to 3 nitrogen atoms, and removing said compound from said NH 3 or amine solvent and any excess carbonol at the end of the reaction.
Claim 8
Independent Claim
200 words
The method for making a compound having the formula ##STR6## 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 which comprises under an inert atmosphere reacting barium metal in liquid NH 3 or amine solvent for said barium with a tertiary carbinol having the formula ##STR7## where R is the same as defined about and H 2 O, the mol ratio of said carbinol to H 2 O being from about 99.5:0.5 to 88:12, the temperature during reaction being from about -100° C. up to the boiling point of the solvent, said amine being selected from the group consisting of saturated non-chelating non-polymerizable aliphatic, cycloaliphatic and heterocyclic primary and secondary monoamines and polyamines and mixtures of the same having from 1 to 12 carbon atoms and from 1 to 3 nitrogen atoms, and removing said compound from said NH 3 or amine solvent and any excess carbonol at the end of the reaction.
Claim 9
Dependent Claim
20 words
The methods according to claim 6 where the mol ratio of a to b is from about 97.5:2.5 to 90:10.
Claim 10
Dependent Claim
12 words
The method according to claim 7 where the Rs are methyl radicals.
Claim 11
Dependent Claim
21 words
The method according to claim 6 containing the subsequent and additional step of dissolving said compound in an aromatic hydrocarbon solvent.
Claim 12
Dependent Claim
33 words
The method according to claim 9 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.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |