Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Inventor
Oliver Imray
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IndividualfiledCriticalIndividual
Application grantedgrantedCritical
Publication of GB190007261ApublicationCriticalpatent/GB190007261A/en
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
7261. Imray, O., [Farbwerke vorm. Meister, Lucius, & Br³ning]. April 19. Dyes, artificial.-A blue dye-stuff for cotton of great fastness is produced by heating p-amido-p-oxydiphenylamine carboxylic acid, or the corresponding nitro-carboxylic acid, with sulphur and an alkaline sulphide at from 160‹-200‹ C. until the mixture begins to solidify. The product is dissolved in water, and the leuco compound of the dye-stuff, mixed with sulphur, is precipitated by addition of a mineral acid. The precipitate is treated with sodium carbonate, whereby the leuco compound is dissolved, and the dye-stuff itself is precipitated from the solution by a current of air. The p-amido and p-nitro-p-oxydiphenylamine carboxylic acids employed in the foregoing process are produced by heating with dilute acids under pressure the p-amido-p-oxydiphenylamine sulphocarboxylic acid of the formula and the corresponding nitro compound, respectively.
GB190007261D1900-04-191900-04-19Manufacture of a Blue Sulphurised Dyestuff.
ExpiredGB190007261A
(en)