2,4,8-Trichloro-tri and tetra bromodibenzofurans
US3935251A · kind A · utility
2Cited by
2References
2Claims
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Assignee
Inventors
Key dates
| Filing date | Mar 7, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Mar 7, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/1535
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Polyhalogenated dibenzofuranes having at least six halogen atoms are prepared by halogenation of 2,4,8-trichlorodibenzofurane or of dibenzofurane. The halogenation may be achieved by Cl.sub.2, Br.sub.2, SO.sub.2 Cl.sub.2, S.sub.2 Cl.sub.2 or similar halogen donors. The products are flameproofing agents for polymers, especially for polyesters and polyolefins. Examples are octachloro-, trichlorotribromo- and trichlorotetrabromo-benzofurane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.