Method of making block copolymers by solid state polymerization

Details Method of making block copolymers by solid state polymerization Method of making block copolymers by solid state polymerization

2005-11-01

2005-11-01

Zalukaeva, Tatyana (Department: 1713)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C528S198000, C528S271000, C528S272000, C568S716000, C568S717000, C568S722000

Reexamination Certificate

active

06960641

ABSTRACT:
A method of preparing block copolymers by solid state polymerization is described. A mixture of a partially crystalline polycarbonate having activated terminal aryloxy groups, for example terminal methyl salicyl groups, when heated together with an oligomeric polyester having reactive terminal hydroxy groups under solid state polymerization conditions affords block copolymers. The activated terminal aryloxy groups play a key role in preserving the block lengths of the starting materials. A control sample in which the partially crystalline polycarbonate lacks activated terminal aryloxy groups, for example polycarbonates substituted by phenol, affords a much lower molecular weight, more highly randomized copolymer product. The product block copolymers are useful as “weatherable” plastic materials.

REFERENCES:
patent: 4323668 (1982-04-01), Brunelle
patent: 5717056 (1998-02-01), Varadarajan et al.
patent: 5905135 (1999-05-01), Idage et al.
patent: 6031063 (2000-02-01), Day et al.
patent: 6143859 (2000-11-01), Chatterjee et al.
patent: 6518391 (2003-02-01), McCloskey et al.

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