Process for manufacturing multiarmed asymmetrical radial block c

Details Process for manufacturing multiarmed asymmetrical radial block c Process for manufacturing multiarmed asymmetrical radial block c

1995-12-15

1997-11-25

Zemel, Irina S.

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

Synthetic resins

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

525105, 525251, 525270, 525299, C08F29704

Patent

active

056914202

ABSTRACT:
The invention is a process for the manufacture of six-armed radial asymmetric block copolymers, comprising of the steps of anionically polymerizing first polymer arms, contacting the first polymer arms with a non polymerizable coupling agent containing 6 functional groups, the amount of the first polymer arms being substantially stoichiometrically corresponding to 4 of the functional groups, anionically preparing second polymer arms, different from the first polymer arms, in the same reactor, adding a polar compound capable of increasing the reactivity of the residual functional groups of the coupling agent, reacting these residual functional groups with the second polymers arms, and recovering the asymetric polymer. The asymmetric polymers are useful in adhesive, coating, or sealant compositions and in bitumen blends for roofing, and in sound deadening or vibration dampening compositions.

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patent: 5369175 (1994-11-01), Hoxmeier et al.
patent: 5393841 (1995-02-01), Himes et al.
patent: 5446093 (1995-08-01), Hoxmeier et al.
patent: 5447995 (1995-09-01), Hoxmeier et al.
European Search Report-Dated Mar. 25, 1996.

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