Quinacridone dye
Description
A series of synthetic red and violet dyes composed of linear quinacridones that are made from terephthalic acid. Quinacridone dyes can exist in four crystalline allotropes, two of which are sold as red and violet pigments. Although synthesized in 1896, quinacridone colors were first recognized as useful pigments by W. Struve at DuPont in 1955 and marketed in 1958 under the name Monastral. These lightfast colorants are used in paints, printing inks, and plastics.
Synonyms and Related Terms
colorante de quinacridona (Esp.)
Examples include:
Red - Monastral red [DuPont; Acra red [Liquitex]; Acra crimson [Binney and Smith]; Bocour red [Bocour Artist Colors];Thalo Red Rose
Violet - Monastral violet, Pigment Violet 19; CI 46500;
Comparisons
MA=methylacrylate MMA=methylmethacrylate EA=ethylacrylate EMA=ethylmethacrylate BA=butylacrylate BMA=butylmethacrylate |}| Pigment number | Manufacture | Pigment name | Manufacture number | Comments | |
|---|---|---|---|---|---|
| A-11 | MMA | 125,000 | 10 | 100% solids, powder, hard resin | resistant to water and alcohol; coatings
for metal, vinyl and plastic | |
| A-101 | MMA | 125,000 | 100 | 40% in MEK hard resin | exterior durability and resistance |
| B-44 | MMA/EA | 140,000 | 60 | 100% solids, pellets | excellent adhesion to various untreated substrates,
PVDF coatings |
| B-48N | MMA/BA | 250,000 | 50 | 100% solids, pellets | unique hardness vs. flexibility; adhesion |
| B-66 | MMA/BMA | 70,000 | 50 | 100% solids, powder | general purpose, fast solvent release |
| B-67 | iBMA | 60,000 | 50 | 100% solids, powder | medium & long oil alkyd modifier, most water
resistant; general purpose thermoplastic |
| [B-72] | EMA/MA | 105,000 | 40 | 100% solids, pellets; 50% in toluene | soft resin, compatible with various resin types |
| B-82 | MMA/EA | 120,000 | 35 | 100% solids, pellets | general purpose, chemical resistant, softest resin |
| B-99N | MMA/BMA | 15,000 | 80 | 100% solids, pellets | improves gloss of other resins; short & medium oil alkyd compatible, pigment dispersant |
Other Properties
Resistant to alkalis and heat.
| Composition | violet- C20H12N2O2 |
|---|---|
| Density | 1.5 |
| Refractive Index | 2.02 - 2.04 |
Sources Checked for Data in Record
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 611
- Reed Kay, The Painter's Guide To Studio Methods and Materials, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1983
- Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
- Monona Rossol, The Artist's Complete Health and Safety Guide, Allworth Press, New York, 1994
- Encyclopedia Britannica, http://www.britannica.com Comment: "chemical compound." Encyclopædia Britannica. 2005. Encyclopædia Britannica Premium Service 7 Apr. 2005 .
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
- Website address 1 Comment: www.handprint.com