Permanent Pink FBBW is supplied as a quinacridone magenta pigment conforming to C.I. Pigment Red 122, constitution number 73915, with CAS registry number 980-26-7. The product model is designated as a surface-conditioned, low-dusting powder rather than a predispersed resin preparation or a waterborne dispersion. The chromophore is 2,9-dimethylquinacridone, a linear trans-quinacridone derivative obtained by thermal ring closure of 2,5-dianilinoterephthalic acid, followed by salt milling or solvent-mediated particle-size reduction and surface finishing. Typical physicochemical values reported for this pigment class include a density of 1.45–1.55 g/cm³ when measured by ISO 787-10, an oil absorption of 40–60 g/100 g under ISO 787-5, and an aqueous slurry pH of 6.5–7.5 under ISO 787-9. The masstone is a blue-shade magenta; in a titanium dioxide reduction at a pigment-to-TiO₂ ratio of 1:10, Permanent Pink FBBW produces a high-chroma pink with CIELAB hue angle h*ab typically in the range 330°–345° when measured with a spectrophotometer set to D65/10° geometry. The product is intended for solvent-based coatings, powder coatings, polyolefin and engineering-plastic masterbatches, and solvent-based printing inks. Published supplier technical data for the FBBW suffix specifically is limited; the values given here are representative ranges for C.I. Pigment Red 122 powders and should be confirmed against the batch certificate.

Lot-to-lot colorimetric tolerance is typically ΔE*ab ≤1.0 in masstone and ΔE*ab ≤1.5 in a 1:10 titanium dioxide reduction against an internal laboratory standard, measured with a sphere spectrophotometer using D65 illuminant and 10° observer. The masstone hue angle h*ab is typically 340°–350°, chroma is 45–60, and lightness L* is 40–50 for a pressed powder tablet. These CIELAB coordinates are not absolute product specifications; incoming inspection must use the supplier certificate of analysis and a mutually agreed master standard.

What distinguishes Permanent Pink FBBW from yellow-shade and transparent C.I. Pigment Red 122 grades?

Differentiation is based on particle-size distribution, surface treatment, and hue direction. Yellow-shade PR122 grades are typically milled to larger primary-particle sizes, with a d50 near 0.12–0.18 µm, which reduces specific surface area to 40–60 m²/g and shifts the tint hue toward a coral pink. Transparent PR122 grades are more finely divided, with a d50 below 0.06 µm and specific surface area above 90 m²/g, producing higher transparency in automotive basecoat and foil applications but increasing pigment-binder interaction and mill-base viscosity. Permanent Pink FBBW occupies an intermediate position: the d50 after surface conditioning is typically 0.08–0.15 µm as determined by ISO 13320-1 laser diffraction analysis, and the BET specific surface area is 55–85 m²/g under ISO 9277. The surface treatment is usually a non-ionic or anionic dispersing agent added at 0.5–1.5 wt% to the dry pigment during finishing. This treatment reduces dusting and improves wetting in aliphatic and aromatic hydrocarbon solvents, but it can also lower the heat-seal resistance of a printed ink film if the treatment agent is not thermally stable above 200°C. In high-speed gravure printing, the treated surface lowers the demand for external dispersant by approximately 15–25% relative to an untreated PR122 powder, although this should be verified in a resin-specific formulation.

The values in Table 1 are not batch specifications but serve as a screening matrix. Lot-to-lot CIELAB color difference for a surface-treated PR122 grade is often controlled within ΔE*ab ≤1.0 against a laboratory standard and ΔE*ab ≤1.5 for production batches.

Compared with C.I. Pigment Violet 19, Permanent Pink FBBW is less blue in masstone. Compared with C.I. Pigment Red 202, which is a quinacridone derivative with a more violet-blue hue, the FBBW grade provides lower melt viscosity in polypropylene at equivalent pigment loading. Compared with C.I. Pigment Red 254 diketopyrrolopyrrole reds, PR122 has a higher-chroma pink hue but lower upper temperature stability; PR254 grades can survive 300°C for 10 min in polyethylene, whereas PR122 is generally limited to 300°C for 5 min before measurable color shift occurs. In PVC and polyolefin blow molding below 220°C, the hue of PR122 is used when a high-chroma pink is specified.

Processing parameters in polyolefin and polyamide injection molding

Permanent Pink FBBW is generally introduced as a masterbatch rather than a direct dry pigment feed. A representative polypropylene masterbatch at 40 wt% pigment loading is produced on a co-rotating twin-screw extruder with L/D 44:1 and screw diameter 25 mm. The carrier resin is a polypropylene homopolymer with a melt flow rate of 10–25 g/10 min according to ISO 1133-1. Barrel set-point temperatures are 180–220°C in the feed zone and 220–240°C at the die; screw speed is 300–400 min⁻¹; specific energy input is 0.25–0.35 kWh/kg. Under these conditions, the pigment is dispersed to a filter pressure rise below 0.2 MPa on a 500 µm screen pack and the resultant masterbatch shows no visible specks at a let-down ratio of 1:25. The process conflict is narrow. If the melt temperature exceeds 280°C for more than 5 min, the quinacridone can undergo partial crystal reorganization and the surface treatment may decompose, leading to color-strength loss of 5–10% relative to the standard. Conversely, if the specific energy input is below 0.20 kWh/kg, agglomerates persist and the tint strength can be 15–20% below the fully dispersed control.

In polyamide 6, pre-drying of virgin resin at 80°C for 4 h in a desiccant dryer is required when ambient relative humidity exceeds 60%; residual moisture above 0.15 wt% promotes hydrolytic degradation of the resin and creates pigment-binder interface defects visible as silver streaks. Let-down injection molding on a 500 kN clamp-force reciprocating-screw machine with a 25–30 mm screw diameter, a melt temperature of 230°C, and a mold temperature of 40°C is used for shade evaluation. Cycle time is 30–45 s. The colorimetric difference between a let-down plate and the masterbatched standard is typically ΔE*ab ≤0.8 when measured with D65/10° conditions.

In coil coating, Permanent Pink FBBW is predispersed in a polyester-melamine mill base at a pigment loading of 15–25 wt%. The mill base is processed on a horizontal bead mill charged with zirconia beads of 0.4–0.6 mm at a tip speed of 8–12 m/s. Hegman gauge readings reach 7–8 after 30–60 min residence time; the corresponding agglomerate size is below 5 µm. The surface treatment reduces mill-base viscosity from 1.0–1.5 Pa·s at 25°C before pigment wetting to 0.6–1.2 Pa·s after complete deagglomeration, depending on resin solids and solvent composition. Over-dispersion beyond 90 min at high shear can create a measurable hue shift of ΔE*ab 0.5–1.2 because of Ostwald ripening; this is the critical dispersion threshold in production-scale batches. The final coating is usually applied at a dry film thickness of 18–25 µm and cured at a peak metal temperature of 224–232°C for 30–45 s. Full weatherfastness evaluation under ISO 4892-2 xenon-arc exposure for 2000 h gives a blue-wool-scale rating of 4–5 for the masstone and 3–4 in a 1:10 titanium dioxide reduction.

When solvent-based ink systems require low re-crystallization and viscosity stability

Solvent-based flexographic and gravure inks prepared from nitrocellulose-polyurethane resin systems can incorporate Permanent Pink FBBW at 5–15 wt% of the liquid ink. Dispersion is carried out in a vertical or horizontal bead mill using zirconium silicate beads of 0.6–0.8 mm at 8–10 m/s tip speed. The grind gauge reading falls below 5 µm after 20–40 min. The pigment shows limited solubility in ethyl acetate, n-propyl acetate, and methyl ethyl ketone; storage-stability testing at 40°C for 72 h in an ethyl acetate-containing formulation up to 20 wt% does not produce visible hue drift. Viscosity stability after 4 weeks at 50°C in a closed container is within ±10% of the initial value when the ink contains 0.5–1.0 wt% of a polyurethane-based high-molecular-weight dispersant. Compared with a conventional calcium lake red such as C.I. Pigment Red 57:1, Permanent Pink FBBW has lower tinting strength per unit mass but higher lightfastness and alkali resistance; in accelerated testing under ISO 105-B02, the PR122 ink retains color at 7–8 Blue Wool, whereas a PR57:1 ink may drop to 3–4 under the same exposure. The alkali-resistance difference is measurable under DIN EN ISO 2812-1 after 24 h exposure to 2% sodium hydroxide; PR122 typically shows ΔE*ab 1.0–2.0, while PR57:1 may show ΔE*ab >4.0. The trade-off is opacity and rheology: PR57:1 provides higher opacity at low film weights, while PR122 requires higher pigment loading or an opaque titanium dioxide underlay.

Thermal degradation pathways in C.I. Pigment Red 122

Thermogravimetric analysis under nitrogen according to ISO 11358-1 shows the decomposition onset temperature at approximately 450–480°C for a pure PR122 powder; under air, onset is lower at 400–430°C. The initial mass-loss region follows first-order kinetics. Apparent activation energy calculated by the Kissinger method from heating rates of 5, 10, 20, and 40 K/min is 140–180 kJ/mol. The decomposition products are primarily carbon dioxide, ammonia, and substituted aromatic fragments from the quinacridone ring. This thermal behavior explains why short residence times above 300°C can be tolerated in polyolefin extrusion but extended exposure or hot spots above 320°C produce yellowing and color-strength loss. In air, oxidative cleavage of the quinacridone ring can begin near 350°C; therefore, drying ovens should be purged with inert gas if powder is preheated above 200°C.

Regulatory and safety screening should follow the supplier’s extended safety data sheet and technical datasheet. For food-contact polymers, the relevant framework may include 21 CFR 178.3297 in the United States or Commission Regulation (EU) No 10/2011 Annex I in the European Union, but the inclusion of Permanent Pink FBBW in a food-contact statement must be confirmed by the supplier for the specific polymer and end-use conditions. Under the RoHS Directive 2011/65/EU, typical organic quinacridone pigments contain cadmium, lead, mercury, and hexavalent chromium below 100 mg/kg when analyzed by acid digestion and ICP-OES; however, batch-specific certificates are required because trace-metal content can vary with the raw-material source and milling media. For toy applications, migration limits for heavy metals under EN 71-3 should be evaluated on the finished toy material rather than on the dry pigment.

Operational limitations include high shear and temperature sensitivity, limited alkali resistance in some resin systems, and incompatibility with amine-based additives that can displace the surface treatment and increase flocculation in solvent-based systems. The product should not be combined with lead-based driers in alkyd formulations without testing, because acidic surface groups may interact with metallic driers and alter drying kinetics. Pre-dry the powder at 80–100°C for 2 h when storage has occurred at relative humidity above 60%. Storage should be in sealed containers below 30°C; recommended shelf life is 36 months from the production date when kept in unopened original packaging. Published data for this specific FBBW configuration is limited; therefore, process validation on the intended production line is required before substituting it for an existing PR122 grade or for another red pigment.