Method of making block copolymers by solid state polymerization

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate

Reexamination Certificate

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C528S198000, C528S271000, C528S272000, C568S716000, C568S717000, C568S722000

Reexamination Certificate

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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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