Process for the preparation of a block oligocarbonate

Details Process for the preparation of a block oligocarbonate Process for the preparation of a block oligocarbonate

1993-07-27

1994-03-15

Lee, Mary C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

528371, C07C 6996, C07C 6806

Patent

active

052947297

ABSTRACT:
A process for preparing a block oligocarbonate is disclosed. The oligocarbonate conforms to ##STR1## where R denotes hydrogen or ##STR2## and where A denotes an aromatic carbonate structure conforming to ##STR3## where Ar is an aromatic radical, n is 2-6 and where B is the residue of an aliphatic polyol is disclosed. In the process a high molecular weight aromatic polycarbonate is reacted, in the melt and in the presence of a catalyst, with an aliphatic polyol. The block oligocarbonate is useful as a reactant in a process for the preparation of copolymers.

REFERENCES:
patent: 3998908 (1976-12-01), Buxbaum
patent: 4216298 (1980-08-01), Schreckenberg et al.
patent: 4267303 (1981-05-01), Konig et al.
patent: 4281101 (1981-07-01), Schreckenberg et al.
patent: 4598129 (1986-07-01), Borman et al.
patent: 4927903 (1990-05-01), Schreckenberg et al.
"Polymer Engineering and Science", Mar. 1982/vol. 22, No. 4, pp. 229-233.

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