§
Luxuse
Patent Intelligence
Sign In
Patent US4520123A successfully refreshed from Google Patents.
← Back to Patent Explorer
US4520123A Expired / Lapsed US ⏱️ 0.0 years remaining

Catalyst system and process for polymerizing conjugated dienes

Assignee: Firestone Polymers LLC
•
Filing: 1984-07-02
•
Granted: 1985-05-28
•
Expires: 2004-07-02
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Conjugated dienes, in particular 1,3-conjugated dienes, can be polymerized or copolymerized using the catalyst system of this invention to polymers wherein the amount of 1,2-structure contained in the polymer is increased, and polymers can be prepared containing varying amounts of 1,2-structure as desired. Such desirable results can be obtained in accordance with the process of the present invention for polymerizing conjugated diene monomers which comprises the use of a catalyst system which comprises (a) at least one anionic initiator based on lithium, and (b) a modifier composition comprising at least one cyclic acetal of a glyoxal. <IMAGE> wherein R and R' are each independently hydrogen, alkyl or aryl groups, and each A is independently an alkylene or an oxyalkylene group. In another embodiment, the catalyst system also contains at least one co-initiator selected from the group consisting of organomagnesium compounds, organoaluminum compounds, or mixtures thereof.

Inventors

  • 👤 James E. Hall

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 19:18
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 23 words
A catalyst system comprising (a) at least one anionic initiator based on lithium, and (b) at least one cyclic acetal of a glyoxal.
Claim 2
Dependent Claim 23 words
A catalyst system comprising (a) at least one anionic initiator based on lithium, and (b) at least one cyclic acetal of a glyoxal.
Claim 3
Dependent Claim 23 words
The catalyst system of claim 1 wherein the anionic initiator is a hydrocarbyl lithium compound containing from about 1 to 20 carbon atoms.
Claim 4
Dependent Claim 14 words
The catalyst system of claim 2 wherein the hydrocarbyl lithium compound is n-butyl lithium.
Claim 5
Dependent Claim 39 words
The catalyst system of claim 1 wherein the cyclic acetal (b) is characterized by the formula ##STR6## wherein R and R' are each independently hydrogen, alkyl or aryl groups, and each A is independently an alkylene or oxyalkylene group.
Claim 6
Dependent Claim 30 words
The catalyst system of claim 4 wherein the alkylene group A is a straight chain or branched chain alkylene or oxyalkylene group containing from 2 to about 10 carbon atoms.
Claim 7
Dependent Claim 13 words
The catalyst system of claim 5 wherein R and R' are each hydrogen.
Claim 8
Dependent Claim 23 words
The catalyst system of claim 1 wherein the cyclic acetal (b) is prepared by reacting a glyoxal with an alkylene or oxyalkylene diol.
Claim 9
Dependent Claim 19 words
The catalyst system of claim 1 also containing (c) at least one organomagnesium compound, organoaluminum compound or mixtures thereof.
Claim 10
Dependent Claim 24 words
The catalyst system of claim 8 wherein the organomagnesium compound is a dihydrocarbyl magnesium compound and the organoaluminum compound is a trihydrocarbyl aluminum compound.
Claim 11
Dependent Claim 18 words
The catalyst system of claim 8 wherein the hydrocarbyl groups contain from 1 to about 20 carbon atoms.
Claim 12
Dependent Claim 21 words
The catalyst system of claim 1 wherein the molar ratio of (a) to (b) is from about 1:0.05 to about 1:20.
Claim 13
Dependent Claim 38 words
The catalyst system of claim 8 wherein the molar ratio of (a) to (b) is from about 1:0.05 to about 1:20, and the molar ratio of (a) or [(a)+(c)] to (b) is from about 1:0.05 to about 1:20.

References Cited (Backward Citations)

US3377404A Cited
US3091606A Cited
US3207742A Cited
US3301824A Cited
US3451988A Cited
US3585168A Cited
US3646321A Cited
US3822219A Cited
US3847883A Cited
US3817955A Cited
US3846385A Cited
US4139490A Cited
US4264753A Cited
US4429090A Cited
US4429091A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-05-27 1988-11-26 1989-05-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-05-27 1992-11-26 1993-05-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-05-27 1996-11-26 1997-05-28 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag