Patent DE2139689A1 successfully refreshed from Google Patents.
DE2139689A1
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DE
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Red pyranthrone dyes - obtd by brominating tetra-chlorpyranthorones, as pigemtns for plastics, printing pastes; for spin dyeing cellulose
Assignee: BASF SE
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Filing: 1971-08-07
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Granted: —
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Expires: 1991-08-07
Abstract
Abstract Dyes are of formula (I): (where one R1 and one R2 is Cl and the other R1 and R2 is H; n is 0.1-2, pref. 0.5-1.5). Prepd. by brominating the parent tetrachloropyranthrone at 0-120 degrees C, in a strong inorganic acid, oleum or chlorosulphonic acid, opt. using a halogenation catalyst. Dyeings are fast to light and weather, also solvents and overspraying.
Inventors
- 👤 Fritz Dr Graser
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-03 21:53
CPC Classifications
C; C09; C09B; C09B3/00; C09B3/40; C09B3/44; C09B3/46
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