A method for producing polyisoprene having mainly alternating cis-1,4-ALT-3,4 structures in the presence of a catalytic system containing a pyridyl iron complex.

摘要

A method for producing a polyisoprene having a mainly alternating cis-1,4-alt-3,4 structure, wherein the production method is (a) at least one pyridyl iron complex having the general formula (I). In the formula, -R1 is selected from a linear or branched C1-C20 alkyl group, preferably a C1-C15 alkyl group, optionally a substituted cycloalkyl group, and optionally a substituted aryl group. -R2 is selected from linear or branched C1-C10 alkyl groups, preferably C1-C3 alkyl groups, and -X is mutually symmetrically identical or different, eg chlorine, bromine, Representing halogen atoms such as iodine, or they represent a linear or branched C1-C20 alkyl group, preferably a C1-C15 alkyl group, in which R3 is a linear or branched C1-C20 alkyl group, At least selected from the pyridyl iron complex, preferably selected from -OCOR3 or -OR3 groups selected from C1-C15 alkyl groups, where -n is 2 or 3, and (b) an organic derivative of aluminum. One type of co-catalyst, preferably the general formula (b1) (R4) 2-Al-O- [-Al (R5) -O-] m-Al- (R6) 2 (II). An aluminoxane having II), in which R4, R5 and R6 are mutually symmetrically identical or different, representing a hydrogen atom or a halogen atom such as chlorine, bromine, iodine, fluorine or directly. It is selected from the C1-C20 alkyl group, cycloalkyl group, and aryl group of the chain or branched chain, and the group is optionally substituted with one or more silicon or germanium atoms, and m is in the range of 0 to 1000. Alkyloxane, which is an integer, and an aluminum compound having the general formula (III) of (b2) Al (R7) (R8) (R9) (III), in which R7 is a hydrogen atom. , Or a linear or branched C1-C20 alkyl group, cycloalkyl group, aryl group, alkylaryl group, arylalkyl group, alkoxy group, and R8 and R9 are mutually symmetrically identical or different, and are directly linked. Polymerizing isoprene in the presence of a catalytic system containing an aluminum compound selected from a chain or branched C1-C20 alkyl group, cycloalkyl group, aryl group, alkylaryl group, arylalkyl group. Aluminum present in the cocatalyst and iron having the general formula (I) A method for producing a polyisoprene having an alternating cis-1,4-alt-3,4 structure, wherein the molecular ratio with iron present in the pyridyl complex is in the range of 5 to 60, preferably 8 to 55. is there.