Process and catalysts for hydrogen mediated anionic polymerization of conjugated dienes and liquid polymers thereof
AssigneeAlbemarle Corporation
InventorWilliam J. LAYMAN, Jr.
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Abstract
The disclosure relates to hydrogen mediated anionically polymerized conjugated diene compositions, including homopolymers and copolymers of isoprene and/or butadiene, and processes and compositions for preparing them.
Claims37
A process for polymerizing conjugated dienes in a hydrocarbon reaction medium, comprising
- a) chemically adding a lithium alkoxide complexed saline hydride LOXSH catalyst to a low boiling conjugated diene to form a polymerization initiating species,
- b) co-feeding at least two gaseous and/or volatile compounds to the reaction medium, wherein the at least two gaseous and/or volatile compounds comprise hydrogen and the low boiling conjugated diene, and
- c) polymerizing at least a portion of the conjugated diene,
- wherein the LOXSH reagent comprises one or more σ-μ polar modifiers.
A process for hydrogen mediated polymerization of conjugated dienes in a hydrocarbon reaction medium, comprising chemically adding lithium alkoxide complexed saline hydride (LOXSH) catalyst to a low boiling conjugated diene to form a polymerization initiating species, and co-feeding at least two gaseous and/or volatile compounds to the reaction medium, wherein the at least two gaseous and/or volatile compounds comprise hydrogen and the low boiling conjugated diene, wherein the LOXSH catalyst comprises one or more σ-μ polar modifiers.
An LOXSH catalyst or reagent composition, wherein the composition is selective for 1,4-CD monomer microstructure enchainment, and the composition comprises 1) at least one tertiary amino alcohol σ-μ polar modifiers having a 2° or a 3° alcohol functional group;
- 2) an organolithium compound;
- and 3) optionally elemental hydrogen and/or an organo silicon hydride.
An LOXSH catalyst or reagent composition, wherein the composition is selective for 3,4-CD and/or 1,2-CD-vinyl monomer microstructure enchainment, and the composition comprises:
- a) at least one tertiary amino alcohol σ-μ or amino-ether-alcohol polar modifiers;
- b) optionally at least one separate ether-alcohol σ-μ polar modifiers;
- c) an organo lithium compound;
- and d) optionally elemental hydrogen and/or an organo silicon hydride.
A hydrogen mediated anionic poly(conjugated diene) composition that is characterized as having:
- 1) number average molecular weight distribution Mn from about 500 to about 2600 Daltons;
- 2) a Brookfield viscosity (25° C.) from about 20 to about 200,000 cP;
- 3) 1,4-CD microstructure content from about 20% to about 85%;
- and 4) glass transition temperature Tg from about −120° C. to about −20° C.
Dependencies are inferred from the claim text.