Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Patent
1993-04-08
1994-04-05
Teskin, Fred
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
502156, 502157, 502171, 526174, 526175, 526181, 526183, C08F 448
Patent
active
053005996
ABSTRACT:
It has been unexpectedly discovered that salts of tetrahydrofurfuryl alcohols, such as the lithium, potassium, and sodium salts of tetrahydrofuryl alcohols, can be used to modify anionic polymerizations of conjugated diene monomers. These modifiers can be used to polymerize isoprene monomer into polyisoprene having from 20% to 30% 1,2-microstructure at excellent polymerization rates. This invention more specifically discloses a catalyst system which is particularly useful in the anionic polymerization of conjugated diene monomers into polymers which is comprised of (a) a initiator which is selected from the group consisting of organolithium compounds, organosodium compounds, organopotassium compounds, organomagnesium compounds, and organobarium compounds, and (b) a modifier which is a metal salt of a tetrahydrofurfuryl alcohol. The subject invention further discloses a process for the synthesis of a rubbery polymer which comprises polymerizing (1) from about 50 weight percent to 100 weight percent conjugated diene monomers and (2) from 0 weight percent to about 50 weight percent monomers which are copolymerizable or terpolymerized with said conjugated diene monomers, in an inert organic solvent in the presence of a catalyst system which is comprised of (a) an initiator selected from the group consisting of organolithium compounds, organosodium compounds, organomagnesium compounds, and organobarium compounds, and (b) a modifier which is a metal salt of a tetrahydrofurfuryl alcohol or a metal salt of a substituted tetrahydrofurfuryl alcohol.
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Patent Application Serial No. 07/864,264, filed Apr. 6, 1992.
Halasa Adel F.
Hsu Wen-Liang
Rockhill Alvin T.
Teskin Fred
The Goodyear Tire & Rubber Company
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