Increasing the reactivity of coupling of block polymers

Details Increasing the reactivity of coupling of block polymers Increasing the reactivity of coupling of block polymers

1982-01-04

1983-08-16

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525375, 525379, 525382, 525384, 525385, 526173, 526336, C08F 840

Patent

active

043992609

ABSTRACT:
There is disclosed a process for the preparation of thermoplastic block polymers which comprises contacting conjugated diolefinic monomers selected from the group consisting of isoprene, piperylene, 2-ethyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene and 1,3-butadiene, and the like, mixed with at least one polyvinyl aromatic coupling compound selected from the group of o, m and p-divinylbenzene, 1,2,4-trivinylbenzene, 1,8-divinylnaphthalene, 1,2-divinyl-3,4-dimethylbenzene, 2,4-divinylbiphenyl, 3,5,4'-trivinylbiphenyl and 1,3,5-trivinylbenzene under solution polymerization conditions with a polystyryllithium catalyst which has been prepared by reacting an alkyllithium compound with a styrene monomer selected from the group consisting of styrene, alpha-methylstyrene, p-methylstyrene, p-t-butylstyrene, 3-methylstyrene, 1-vinylnaphthalene, and the like, in which an amount of polyvinyl aromatic coupling compound ranges from about 1.0 to about 6 vinyl groups of the polyvinyl aromatic coupling compound per mole of active lithium catalyst used, in which the living block copolymer is treated with (A) a polar compound selected from the group consisting of ethylene glycol dimethyl ether (glyme), diethylene glycol dimethyl ether (diglyme), triethylene glycol dimethyl ether (triglyme), tetraethylene glycol dimethyl ether tetraglyme), 2,3-dimethoxybutane, N,N,N',N'-tetramethylethylene-diamine (TMEDA), tri-n-butylphosphine and hexamethylphosphoric triamide (HMPA), in which the molar ratio of the said polar compounds to the active lithium ranges from about 0.01/1 to about 20/1 or (B) a polar compound selected from the group consisting of tetrahydrofuran, diethyl ether, triethylamine, 1,4-diazabicyclo-2.2.2-octane (DABCO), p-dioxane, tri-n-butylamine and N,N'-dimethylpiperazine, in which the molar ratio of the said polar compounds to the active lithium ranges from about 0.5/1 to about 100/1.

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