公开(公告)号：DK133161C

公开(公告)日：1976-09-06

申请号：DK428271

申请日：1971-09-01

Applicant: HOECHST AG

Inventor： BETZEL C ,  RIBKA J ,  WORFEL E

IPC: C08K5/3447 ,  C09B29/20

公开(公告)号：DK133161B

公开(公告)日：1976-03-29

申请号：DK428271

申请日：1971-09-01

Applicant: HOECHST AG

Inventor： BETZEL C ,  RIBKA J ,  WORFEL E

IPC: C08K5/3447 ,  C09B29/20

公开(公告)号：BR7708260A

公开(公告)日：1978-09-05

申请号：BR7708260

申请日：1977-12-13

Applicant: HOECHST AG

Inventor： WORFEL E ,  LANDLER J

IPC: C09B62/515 ,  C09B67/26 ,  C09B67/36 ,  D06P1/12 ,  D06P1/38 ,  C09B62/00

公开(公告)号：IN144344B

公开(公告)日：1978-04-29

申请号：IN152CA1976

申请日：1976-01-28

Applicant: HOECHST AG

Inventor： WORFEL E ,  LANDLER J

IPC: C09B29/00 ,  C09B41/00 ,  C09B67/24 ,  C09B31/04 ,  D06P1/16

Abstract: A new and very advantageous Process had been found for the preparation of azo dyestuffs by diazotation and coupling in which the synthesis is carried out without the hitherto usual addition of an acid, with the proviso that at least one of the diazo and coupling components contains at least one acid group. Besides the saving of reaction material and subsequently of alkali for neutralization of the reaction medium and isolation of the dyestuff, highly concentrated solutions of the dyestuff and salt-free or practically salt-free dyestuffs can be obtained, and waste-water is no longer charged with big amounts of salts.

公开(公告)号：IN140305B

公开(公告)日：1976-10-16

申请号：IN168CA1973

申请日：1973-01-24

Applicant: HOECHST AG

Inventor： LANDLER J ,  HUNGER K ,  WORFEL E

IPC: C09B29/20 ,  C09B29/00 ,  C09B41/00