Process for preparing 3,4-polyisoprene rubber

Details Process for preparing 3,4-polyisoprene rubber Process for preparing 3,4-polyisoprene rubber

1996-07-24

1997-10-14

Teskin, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526180, 526181, 5263402, C08F 448, C08F13608

Patent

active

056774028

ABSTRACT:
This invention reveals an initiator system which is comprised of (a) a lithium initiator, (b) a sodium alkoxide and (c) a polar modifier; wherein the molar ratio of the sodium alkoxide to the lithium initiator is within the range of about 0.05:1 to about 3:1; and wherein the molar ratio of the polar modifier to the lithium initiator is within the range of about 0.25:1 to about 5:1. The subject invention also discloses a process for preparing 3,4-polyisoprene rubber which comprises polymerizing isoprene monomer with a lithium initiator at a temperature which is within the range of about 30.degree. C. to about 100.degree. C. in the presence of a sodium alkoxide and a polar modifier, wherein the molar ratio of the sodium alkoxide to the lithium initiator is within the range of about 0.05:1 to about 3:1; and wherein the molar ratio of the polar modifier to the lithium initiator is within the range of about 0.25:1 to about 5:1.

REFERENCES:
patent: 3324191 (1967-06-01), Wofford
patent: 3496154 (1970-02-01), Wofford
patent: 3736312 (1973-05-01), Halasa
patent: 3796267 (1974-03-01), Cheng et al.
patent: 4647634 (1987-03-01), Jalics
patent: 4960842 (1990-10-01), Lo et al.
patent: 5393721 (1995-02-01), Kitamura

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