Bigraft copolymers and process for the preparation thereof

Details Bigraft copolymers and process for the preparation thereof Bigraft copolymers and process for the preparation thereof

1975-09-09

1977-04-26

Holler, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260879, 260880R, 260884, 260886, C08F25506, C08F25702, C08F25502, C08F25904

Patent

active

040201279

ABSTRACT:
Disclosed is a novel bigraft copolymer comprising a polyhydrocarbon backbone selected from the class consisting of aromatic homopolymers, saturated and unsaturated hydrocarbon homopolymers, such homopolymers having halogen functionality and copolymers and terpolymers formed therefrom, and two different branches which are selected from the group consisting of monovinyl aromatic compounds and isoolefins. The bigraft copolymer is formed by the selective sequential cationic initiation of a first charge of one monomer onto the backbone at specific functional positions thereon and in the presence of a suitable solvent and an alkylaluminum compound. The resultant monograft copolymer is subsequently subjected to a second charge of another monomer, in the presence of a suitable solvent and an alkylaluminum compound, which becomes polymerized at the remaining, different functional positions available on the backbone. Also described are steps for substituting desired functional groups on the backbone and for the separation and purification of the mono and bigraft copolymer products.

REFERENCES:
patent: 3644584 (1972-02-01), Fryd
patent: 3694377 (1972-09-01), Kennedy et al.
patent: 3904708 (1975-09-01), Kennedy et al.
patent: 3933942 (1976-01-01), Kennedy et al.

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