Polybutadiene and process for preparing the same

Details Polybutadiene and process for preparing the same Polybutadiene and process for preparing the same

1986-02-14

1987-12-01

Michl, Paul R.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5253323, 526181, 526335, C08F 448

Patent

active

047105542

ABSTRACT:
A polybutadiene having an average 1,2-bond content of 18 to 32% by mole, a branched polymer chain content of 60% by weight or more and a Mooney viscosity at 100.degree. C. of 40 to 90, the viscosity of a 5% by weight concentration solution of this polybutadiene in styrene at 25.degree. C. being 60 to 90 cps, and a process for preparing the polybutadiene comprising starting the polymerization of 1,3-butadiene in an inert hydrocarbon solvent in the presence of a Lewis basic compound and an organolithium compound, the latter compound being in an amount of 0.5 to 3 millimoles per 100 g of 1,3-butadiene, at a temperature selected from the range of 30.degree. to 80.degree. C., carrying out the polymerization by controlling the temperature so that the temperature at the end of polymerization may be 5.degree. to 40.degree. higher than the temperature at the start of polymerization, and adding to the resulting polymer solution a polyfunctional halogen compound in an amount of 0.6 to 1 equivalent per equivalent of the organolithium compound to further react the polymer with the polyfunctional halogen compound.

REFERENCES:
patent: 3801554 (1974-04-01), Selman
patent: 3879366 (1975-04-01), Selman
patent: 3937681 (1976-02-01), Nordsiek
patent: 4020258 (1977-04-01), Farrar
patent: 4022959 (1977-05-01), Sommer
patent: 4340685 (1982-07-01), Takeuchi
patent: 4429091 (1984-01-01), Hall
patent: 4523618 (1985-06-01), Yamamoto et al.

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