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US 5,334,731 AGranted
Polyhalodihydrodioxins and polyhalodioxoles
AssigneeE. I. Du Pont de Nemours and Company
InventorPaul R. Resnick
Life of this patent
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Abstract
This invention is directed to halodihydrodioxins, their preparation and their polymers, which provide amorphous homopolymers that are resistant to ring opening side reactions. The resulting polymers can be used for films and thermally stable molded objects, coatings for substrates such as wood, glass, paper and metal and for protective packaging. This invention also concerns the preparation of polyhalogenated dioxoles.
Claims6
A process for the preparation of halogenated dioxoles of the structure:
- ##STR50## wherein Q.sup.1 and Q.sup.2 are each F or Cl;
- from halogenated dioxolanes of the structure:
- ##STR51## wherein Q.sup.1 and Q.sup.2 are each F or Cl, provided that at least one of each of Q.sup.1 and Q.sup.2 in structure A is Cl via dechlorination of structure A comprising treatment of structure A with zinc in the presence of a solvent selected from DMF, N,N-dimethyl acetamide and N-methyl pyrrolidone and in the presence of a metal activating agent selected from 1,2-dibromoethane or bromine.
Dependencies are inferred from the claim text.