US4079176A
Expired / Lapsed
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Polymerization process
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1976-06-17
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Granted: 1978-03-14
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Expires: 1996-06-17
Abstract
Abstract Process of homopolymerizing conjugated dienes or copolymerizing conjugated dienes either with each other or with vinyl aromatic compounds to form elastomeric products having simultaneously a high content of trans-1,4 linkages and a low content of 1,2 linkages. In accordance with the invention, the monomers are reacted in a reaction medium in the presence of an added catalytic composition comprising (a) an organo-lithium initiator and (b) a catalyst compound having one of the formulas: M.sup.2A [M.sup.3A R.sup.1 R.sup.2 R.sup.3 R.sup.4 ].sub.2 or M.sup.2A [M 2B (R 1 ) 4 ] in which M 2A is a metal of Group 2A of the Mendeleev periodic table of elements; M 3A is a metal of Group 3A of the Mendeleev periodic table of elements; M 2B is a metal of Group 2B of the Mendeleev periodic table of elements; R 1 , R 2 and R 3 are alkyl or aralkyl radicals; and R 4 is an alkyl radical or an aralkyl radical or the radical OR 5 in which R 5 is an alkyl radical or an aralkyl radical.
Inventors
- 👤 Yves deZarauz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:55
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
183 words
A process of homopolymerizing conjugated dienes or copolymerizing conjugated dienes with other conjugated dienes or with vinyl aromatic compounds to form elastomeric products having simultaneously a high content of more than about 70% of trans-1,4 linkages and a low content of less than about 5% of 1,2 linkages which comprises reacting the monomers in a reaction medium in the presence of an added catalytic composition comprising (a) an organo-lithium initiator and (b) a catalyst compound having the formula M.sup.2A [M.sup.3A R.sup.1 R.sup.2 R.sup.3 R.sup.4 ].sub.2 in which M 2A is a metal of Group 2A of the Mendeleev periodic table of elements; M 3A is aluminum or boron; R 1 , R 2 and R 3 are alkyl or aralkyl radicals; and R 4 is an alkyl radical or an aralkyl radical or the radical OR 5 in which R 5 is an alkyl radical or an aralkyl radical; said organo-lithium initiator and said catalyst compound being present in such amounts that the molar ratio of gram atoms of lithium to gram atoms of metal of Group 2A is between 0.2 and 4.
Claim 2
Dependent Claim
183 words
A process of homopolymerizing conjugated dienes or copolymerizing conjugated dienes with other conjugated dienes or with vinyl aromatic compounds to form elastomeric products having simultaneously a high content of more than about 70% of trans-1,4 linkages and a low content of less than about 5% of 1,2 linkages which comprises reacting the monomers in a reaction medium in the presence of an added catalytic composition comprising (a) an organo-lithium initiator and (b) a catalyst compound having the formula M.sup.2A [M.sup.3A R.sup.1 R.sup.2 R.sup.3 R.sup.4 ].sub.2 in which M 2A is a metal of Group 2A of the Mendeleev periodic table of elements; M 3A is aluminum or boron; R 1 , R 2 and R 3 are alkyl or aralkyl radicals; and R 4 is an alkyl radical or an aralkyl radical or the radical OR 5 in which R 5 is an alkyl radical or an aralkyl radical; said organo-lithium initiator and said catalyst compound being present in such amounts that the molar ratio of gram atoms of lithium to gram atoms of metal of Group 2A is between 0.2 and 4.
Claim 3
Dependent Claim
28 words
The process according to claim 1 wherein said molar ratio of gram atoms of lithium to gram atoms of metal of Group 2A is between 0.5 and 2.
Claim 4
Dependent Claim
28 words
The process according to claim 1 wherein the organo-lithium initiator used is n-butyl lithium, the conjugated diene used is butadiene and the vinyl aromatic compound used is styrene.
Claim 5
Dependent Claim
158 words
A process of homopolymerizing conjugated dienes or copolymerizing conjugated dienes with other conjugated dienes or with vinyl aromatic compounds to form elastomeric products having simultaneously a high content of more than about 70% of trans-1,4 linkages and a low content of less than about 5% of 1,2 linkages which comprises reacting the monomers in a reaction medium in the presence of an added catalytic composition comprising (a) an organo-lithium initiator and (b) a catalyst compound having the formula M.sup.2A [M.sup.3A R.sup.1 R.sup.2 R.sup.3 R.sup.4 ].sub.2 in which M 2A is a metal of Group 2A of the Mendeleev periodic table of elements; M 3A is aluminum or boron; R 1 , R 2 , R 3 and R 4 are alkyl or aralkyl radicals; said organo-lithium initiator and said catalyst compound being present in such amounts that the molar ratio of gram atoms of lithium to gram atoms of metal of Group 2A is between 0.2 and 4.
Claim 6
Dependent Claim
158 words
A process of homopolymerizing conjugated dienes or copolymerizing conjugated dienes with other conjugated dienes or with vinyl aromatic compounds to form elastomeric products having simultaneously a high content of more than about 70% of trans-1,4 linkages and a low content of less than about 5% of 1,2 linkages which comprises reacting the monomers in a reaction medium in the presence of an added catalytic composition comprising (a) an organo-lithium initiator and (b) a catalyst compound having the formula M.sup.2A [M.sup.3A R.sup.1 R.sup.2 R.sup.3 R.sup.4 ].sub.2 in which M 2A is a metal of Group 2A of the Mendeleev periodic table of elements; M 3A is aluminum or boron; R 1 , R 2 , R 3 and R 4 are alkyl or aralkyl radicals; said organo-lithium initiator and said catalyst compound being present in such amounts that the molar ratio of gram atoms of lithium to gram atoms of metal of Group 2A is between 0.2 and 4.
Claim 7
Dependent Claim
28 words
The process according to claim 4 wherein said molar ratio of gram atoms of lithium to gram atoms of metal of Group 2A is between 0.5 and 2.
Claim 8
Dependent Claim
28 words
The process according to claim 4 wherein the organo-lithium initiator used is n-butyl lithium, the conjugated diene used is butadiene and the vinyl aromatic compound used is styrene.
Claim 9
Dependent Claim
23 words
The process according to claim 4 wherein the catalytic composition comprises n-butyl lithium and Ca[Al(C 2 H 5 ) 4 ] 2 .
Claim 10
Dependent Claim
23 words
The process according to claim 4 wherein the catalytic composition comprises n-butyl lithium and Ba[Al(C 2 H 5 ) 4 ] 2 .
Claim 11
Dependent Claim
23 words
The process according to claim 4 wherein the catalytic composition comprises n-butyl lithium and Sr[Al(C 2 H 5 ) 4 ] 2 .
Claim 12
Dependent Claim
175 words
A process of homopolymerizing conjugated dienes or copolymerizing conjugated dienes with other conjugated dienes or with vinyl aromatic compounds to form elastomeric products having simultaneously a high content of more than about 70% of trans-1,4 linkages of a low content of less than about 5% of 1,2 linkages which comprises reacting the monomers in a reaction medium in the presence of an added catalytic composition comprising (a) an organo-lithium initiator and (b) a catalyst compound having the formula M.sup.2A [M.sup.3A R.sup.1 R.sup.2 R.sup.3 R.sup.4 ].sub.2 in which M 2A is a metal of Group 2A of the Mendeleev periodic table of elements; M 3A is aluminum or boron; R 1 , R 2 and R 3 are alkyl or aralkyl radicals; and R 4 is the radical OR 5 in which R 5 is an alkyl radical or an aralkyl radical; said organo-lithium initiator and said catalyst compound being present in such amounts that the molar ratio of gram atoms of lithium to gram atoms of metal of Group 2A is between 0.2 and 4.
Claim 13
Dependent Claim
175 words
A process of homopolymerizing conjugated dienes or copolymerizing conjugated dienes with other conjugated dienes or with vinyl aromatic compounds to form elastomeric products having simultaneously a high content of more than about 70% of trans-1,4 linkages of a low content of less than about 5% of 1,2 linkages which comprises reacting the monomers in a reaction medium in the presence of an added catalytic composition comprising (a) an organo-lithium initiator and (b) a catalyst compound having the formula M.sup.2A [M.sup.3A R.sup.1 R.sup.2 R.sup.3 R.sup.4 ].sub.2 in which M 2A is a metal of Group 2A of the Mendeleev periodic table of elements; M 3A is aluminum or boron; R 1 , R 2 and R 3 are alkyl or aralkyl radicals; and R 4 is the radical OR 5 in which R 5 is an alkyl radical or an aralkyl radical; said organo-lithium initiator and said catalyst compound being present in such amounts that the molar ratio of gram atoms of lithium to gram atoms of metal of Group 2A is between 0.2 and 4.
Claim 14
Dependent Claim
28 words
The process according to claim 10 wherein said molar ratio of gram atoms of lithium to gram atoms of metal of Group 2A is between 0.5 and 2.
Claim 15
Dependent Claim
28 words
The process according to claim 10 wherein the organo-lithium initiator used is n-butyl lithium, the conjugated diene used is butadiene and the vinyl aromatic compound used is styrene.
Claim 16
Dependent Claim
27 words
The process according to claim 10 wherein the catalytic composition comprises n-butyl lithium and Ba[Al(C 2 H 5 ) 3 OCH(CH 3 ) 2 ] 2 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |