Process for preparing styrene-butadiene rubber or butadiene rubb

Details Process for preparing styrene-butadiene rubber or butadiene rubb Process for preparing styrene-butadiene rubber or butadiene rubb

1999-09-20

2000-10-17

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5253323, 5253329, 5253332, 525342, 525370, 525382, C08F 448, C08F 832, C08F 842

Patent

active

061333883

ABSTRACT:
This invention relates to a process for preparing styrene-butadiene rubber or butadiene rubber with both ends of the polymer chain modified by solution polymerization, wherein styrene-butadiene rubber or butadiene rubber is polymerized using a monofunctional anionic polymerization initiator modified with amines or the like, and then the active anion at the ends of the polymer chain is reacted with the commonly available modifier. Unlike a bifunctional initiator that shows a poor solubility in a nonpolar solvent, an increase in viscosity and loss of modification efficiency induced by impurity, styrene-butadiene rubber or butadiene rubber by solution polymerization can be prepared using the modified anionic polymerization initiator of the invention.

REFERENCES:
patent: 3326881 (1967-06-01), Uraneck et al.
patent: 4397994 (1983-08-01), Takeuchi et al.
patent: 4550142 (1985-10-01), Akita et al.
patent: 5274106 (1993-12-01), Lawson et al.

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