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
GB20488/23A
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.)
Durand and Huguenin AG
Original Assignee
Durand and Huguenin AG
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 Durand and Huguenin AGfiledCriticalDurand and Huguenin AG
Publication of GB202632ApublicationCriticalpatent/GB202632A/en
C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
C09B9/00—Esters or ester-salts of leuco compounds of vat dyestuffs
Landscapes
Chemical & Material Sciences
(AREA)
Organic Chemistry
(AREA)
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
In the processes described in the parent Specification and Specification 202,630 for the production of ethereal salts of leuco vat-dyes, the chlorsulphonic acid or chlorsulphonate employed is replaced by fuming sulphuric acid or sulphuric anhydride. Examples are given in which leuco indigo is treated with fuming sulphuric acid, or sulphuric anhydride, in presence of dimethylaniline and chlorbenzene, air being excluded.