| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_79751aeaa9923745648e5ae7d9c35782 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B67-0073
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B67-002
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B69-04 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B67-26
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H21-28
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B56-04
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B69-04 |
| filingDate |
1989-06-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1991-08-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_340290633a9ea06feea2b70d36494276
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bdbb9bd439df692fa892971fc752d990
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c9042a9188a22e30b91178a5d721b554 |
| publicationDate |
1991-08-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-5041539-A |
| titleOfInvention |
Preparation of aqueous concentrates of yellow azo and azoxystilbene dyes utilizing alkanolamine salts |
| abstract |
The invention relates to a process for the preparation of concentrated storage-stable aqueous solutions of yellow azo- and azoxystilbene dyes which are obtained by self-condensation of 4-nitrotoluene-2-sulfonic acid in the presence of an alkali metal hydroxide, by converting the sparingly soluble alkali metal salt of the dye into a water-soluble ammonium salt by double cation exchange via a lipophilic ammonium salt, which process comprises carrying out the double ion exchange in a two-phase system of nitrobenzene/water and using, for the first ion exchange a di- or trialkylamine containing a total of 12 to 40 carbon atoms and, for the second ion exchange, a mono-, di- or trialkanolamine containing 2 to 4 carbon atoms in each alkyl moiety. n The concentrated storage-stable dye solutions so obtained are particularly suitable for dyeing paper. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2433264-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-101309978-B
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2008295262-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1548069-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6160169-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6491731-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2012120543-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2005132510-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7331998-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7713311-B2 |
| priorityDate |
1984-11-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |