Process for the preparation of block copolymers

Details Process for the preparation of block copolymers Process for the preparation of block copolymers

1993-03-26

1993-11-23

Lipman, Bernard

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

Synthetic resins

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

525102, 525105, 525123, 525153, 525171, C08L 8300

Patent

active

052644898

ABSTRACT:
Coupling of block base copolymers terminated by a lithium atom of the typical formula S-B-Li, in which S is a monovinylaromatic hydrocarbon block and B is a conjugated diene block, by the use of at least one difunctional deactivating coupling agent and at least one polyfunctional deactivating coupling agent in a molar ratio such that the linear polymer obtained by coupling represents 65 to 95% by weight of the total polymer material obtained by coupling.

REFERENCES:
patent: 2684391 (1954-07-01), Jones
patent: 3639521 (1972-02-01), Hsieh
patent: 3751389 (1973-08-01), Hotta et al.
patent: 4091198 (1978-05-01), Smith et al.
patent: 4417027 (1983-11-01), Milkovich
patent: 4489187 (1984-12-01), Middlebrook

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