US4129705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process
Assignee: Compagnie Generale des Etablissements Michelin SCA
•
Filing: 1977-01-13
•
Granted: 1978-12-12
•
Expires: 1997-01-13
Abstract
Abstract Homopolymers of conjugated dienes and copolymers of conjugated dienes with vinyl aromatic compounds or with other conjugated dienes having improved properties and an elastomeric character are prepared by use of a catalytic composition which comprises (a) an organo-lithium initiator and (b) a tercatalyst system comprising (b 1 ) a compound of barium or strontium or calcium, (b 2 ) an organometallic compound of a metal of Group 2B or 3A of the Mendeleev periodic table of elements and (b 3 ) an alkali metal alcoholate ether or amine.
Inventors
- 👤 Yves de Zarauz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:28
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A process of homopolymerizing conjugated dienes or copolymerizing conjugated dienes with other conjugated dienes or with vinyl aromatic compounds to form elastomeric products which consists essentially of reacting the monomers in the presence of a catalytic composition consisting essentially of (a) an organo-lithium initiator and (b) a tercatalyst system comprising (b 1 ) a compound of barium or strontium or calcium, (b 2 ) an organometallic compound of aluminum or zinc and (b 3 ) an alkali metal alcoholate ether or amine.
Claim 2
Dependent Claim
82 words
A process of homopolymerizing conjugated dienes or copolymerizing conjugated dienes with other conjugated dienes or with vinyl aromatic compounds to form elastomeric products which consists essentially of reacting the monomers in the presence of a catalytic composition consisting essentially of (a) an organo-lithium initiator and (b) a tercatalyst system comprising (b 1 ) a compound of barium or strontium or calcium, (b 2 ) an organometallic compound of aluminum or zinc and (b 3 ) an alkali metal alcoholate ether or amine.
Claim 3
Dependent Claim
45 words
The process according to claim 1 wherein the compound of barium or strontium or calcium is mixed with the organometallic compound of aluminum or zinc at a temperature between about 20° C. and about 100° C. for about 1 hour to form a preformed mixture.
Claim 4
Dependent Claim
27 words
The process according to claim 1 wherein the components of the catalytic composition are present in such quantities that the ratios are within the following limits: ##EQU2##
Claim 5
Dependent Claim
48 words
The process according to claim 1 wherein the alkali metal alcoholate ether or amine has one of the following two formulas: R(OCH.sub.2 CH.sub.2).sub.n OM.sup.1A or (R).sub.2 NCH.sub.2 CH.sub.2 OM.sup.1A in which M 1A represents an alkali metal; R is an alkyl radical; and n is a whole number.
Claim 6
Dependent Claim
42 words
The process according to claim 1 wherein butadiene is used as the conjugated diene, styrene is used as the vinyl aromatic compound and the catalytic composition comprises n-butyl lithium, a barium phenate, a trialkyl aluminum, and a lithium alcoholate ether or amine.
Claim 7
Dependent Claim
23 words
The process according to claim 5 wherein the lithium alcoholate ether is C 2 H 5 (OCH 2 CH 2 ) 2 OLi.
Claim 8
Dependent Claim
23 words
The process according to claim 5 wherein the lithium alcoholate amine is (C 2 H 5 ) 2 NCH 2 CH 2 OLi.
Claim 9
Dependent Claim
12 words
The homopolymers or copolymers obtained by the process according to claim 1.
References Cited (Backward Citations)
US3607851A
Cited
US3716495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |