Production of metal-containing azo dyestuffs

  • US 2,856,397 A
  • Filed: 10/07/1953
  • Issued: 10/14/1958
  • Est. Priority Date: 10/09/1952
  • Status: Expired due to Term
First Claim
Patent Images

1. IN A PROCESS FOR THE PRODUCTION OF A METAL COMPLEX COMPOUND OF A MONOAZO DYESTUFF BY REACTION OF A METALFREE MONOAZO DYESTUFF OF THE GROUP CONSISTING OF O.O'"'"''"'"'-DIHYDROXY, O-METHOXY-O'"'"''"'"'-HYDROXY AND O-CARBOXY-O'"'"''"'"'-HYDROXY MONOAZO COMPOUNDS CONTAINING A SULFONIC ACID GROUP IN PARA-POSITION TO A HYDROXY GROUP WITH A COMPLEX FORMING METAL SALT WHEREIN THE METAL IS BOUND IN COMPLEX COMBINATION WITH SAID MONOAZO DYESTUFF WHILE SPLITTING OFF SAID SULFONIC ACID GROUP IN PARA-POSITION TO HYDROXY GROUP, THE IMPROVEMENT WHICH COMPRISES:

  • HEATING SAID METAL-FREE MONOAZO DYESTUFF TOGETHER WITH SAID COMPLEX FORMING METAL SALT IN A REACTION MEDIA CONSISTING ESSENTIALLY OF A POLYHYDRIC ALCOHOL AT ABOUT 100*C. TO 150*C., SAID POLYHYDRIC ALCOHOL ACTING TO SPLIT OFF A SULFONIC ACID GROUP IN PARA-POSITION TO A HYDROXY GROUP.

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