Participants
| Role | Name | HCID | Charge |
|---|
| Reactant | Methanol | HCID 887 | — |
| Reactant | 2,5-Dianilinoterephthalic acid | HCID 82351 | — |
| Reactant | 1,4-Benzenedicarboxylic acid, 2,5-bis[(4-methoxyphenyl)amino]- | HCID 3084837 | — |
| Solvent | Water | HCID 962 | — |
| Product | Quinacridone | HCID 13976 | — |
Reaction Steps
A mixture (one part) of 2,5-dianilino-terephthalic acid (80 wt. %) and 2,5-dianisidino-terephthalic acid (20 wt. %) was dissolved in polyphosphoric acid (6.14 parts at 118.5%). The solution, already at 110° C., was heated to 130° C. for 3 hours, cooled to 100° C. and diluted to a fluid mass with water (0.5 parts). The solution was drowned into methanol (11.6 parts) and heated at 120° C. for 4 hours. A very bluish, transparent quinacridone pigment was obtained.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
|---|
| Patent number | US06494949B2 |
|---|
| Source dataset | uspto-grants-2002_12 |
|---|
| ORD ID | ord-5be680ccc1ac465b8370b7b1b079841e |
|---|
| Source note | uspto-grants-2002_12 |
|---|
