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US3664989A
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Methods for the preparation of synthetic polymers
Assignee: Individual
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Filing: 1969-10-27
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Granted: 1972-05-23
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Expires: 1989-10-27
Abstract
Abstract A method for the homopolymerization of conjugated diene hydrocarbons or for the copolymerization of different dienes either with one another or with styrene-type monomers in order to prepare polymers or copolymers having a pre-set molecular weight, which comprises carrying out the homopolymerization or copolymerization of said hydrocarbons in the presence of an alkali metal catalyst, such as lithium, and a modifier obtained by reacting an alkali metal with a conjugated hydrocarbon and an organoaluminum compound, the alkali metal-to-aluminum molar ratio in said modifier being 1:1.
Inventors
- 👤 Gennady Nikolaevich Petrov
- 👤 Grigory Fedorovich Lisochkin
- 👤 Valentin Parmenovich Shmagin
- 👤 Olga Mikhailovna Shibanova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:39
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
11 words
A method according to claim 1, wherein lithium is the catalyst.
Claim 2
Dependent Claim
11 words
A method according to claim 1, wherein sodium is the catalyst.
Claim 3
Dependent Claim
47 words
A method according to claim 1, wherein the organoaluminum compound is selected from the group consisting of compounds of the formulas AlR3, AlR2OR, AlR2H, AlR2Hal and AlR2NR2, wherein R is an alkyl or aryl having from one to 10 carbon atoms and Hal is a halogen atom.
Claim 4
Dependent Claim
76 words
A method according to claim 1, wherein polymerization is carried out in the presence of any amount of alkali metal catalyst, with the proviso that the total amount of alkali metal contained in the modifier and used as the polymerization catalyst exceeds one mole per mole of the organoaluminum compound, and wherein the organoaluminum compound has the formulas AlR3, AlR2OR or AlR2NR2 wherein R is an alkyl oR aryl group of 1 to 10 carbon atoms.
Claim 5
Dependent Claim
75 words
A method according to claim 1, wherein polymerization is carried out in the presence of any amount of alkali metal catalyst, with the proviso that the total amount of alkali metal contained in the modifier and used as the polymerization catalyst exceeds two moles per mole of the organoaluminum compound, and wherein the organoaluminum compound has the formulas AlR2Hal or AlR2H wherein R is an alkyl or aryl group of one to 10 carbon atoms.
Claim 6
Dependent Claim
43 words
A method according to claim 1, wherein the modifier is obtained in situ from a diene hydrocarbon, an alkali metal and an organoaluminum compound in the reaction medium which contains said components in amounts which are adequate for the preparation of a polymer.
Claim 7
Dependent Claim
42 words
A method according to claim 1, wherein in order to prepare a polymer having Alpha , omega -functional groups, the reaction mixture is treated, after completion of the polymerization with reagents which provide the desired functional groups into the thus obtained polymer.
Claim 8
Dependent Claim
26 words
A method according to claim 8, wherein the reagents which provide functional groups are selected from the group consisting of olefin oxides, carbon dioxide, and epichlorohydrin.
Claim 9
Dependent Claim
23 words
A method according to claim 1, wherein polymerization is carried out at a temperature in the range of from 0* to 80* C.
Claim 10
Dependent Claim
101 words
A method according to claim 1, wherein the molecular weight of the polymers to be synthesized is calculated from the equation M (a . mo)/(ro) . Mo wherein: M denotes the predetermined molecular weight of the target polymer; mo is the number of moles of monomer; ro is the number of Al moles in the modifier; Mo designates the molecular weight of the monomer, and a 2, provided the organoaluminum compound used for preparation of the modifier is represented by the formula AlR3, or when the polymers or copolymers to be synthesized have a molecular weight of not greater than 10,000.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |