KLJ Plasticizers Kanatol 100 Dimethyl Phthalate (DMP)

Cellulose acetate sheet and profile extrusion integrates Kanatol 100 DMP as a primary plasticiser at 18–25 phr, calculated on dry cellulose acetate flake. The plasticiser is absorbed in a jacketed high-speed mixer at 110–125 °C before the dry blend is transferred to a vented single-screw extruder with L/D 25:1 to 30:1 and a chromium-plated screw. A breaker plate carrying wire screens of 150–250 µm is installed ahead of the die; barrel temperatures are profiled from 160 °C in the feed zone to 215 °C in the metering zone, with vacuum degassing at 0.08–0.09 MPa to strip residual water and entrained air. The melt is formed into sheet or profile through a flat die or calibration sleeve, then polished on a three-roll stack with roll temperatures from 70 °C to 110 °C. Finished sheet thickness typically ranges from 0.3 mm to 4.0 mm. The presence of DMP reduces melt viscosity and permits lower melt temperatures than unplasticised cellulose acetate; however, because the boiling point of DMP is 284 °C, melt zones maintained above 220 °C increase the rate of volatilisation and produce surface splay on the extrudate. Tensile properties of the plasticised sheet are checked under ASTM D638-14, flexural modulus under ISO 178:2019, and Vicat softening temperature under ISO 306:2022. If the sheet is intended for secondary fabrication, drilling and routing coolant must not exceed 40 °C to avoid localised plasticiser migration. End products include spectacle frames, tool handles, display packaging, and decorative automotive interior trim. No food-contact claim is assigned to this application unless the specific finished article is assessed under current Commission Regulation (EU) 10/2011 migration rules.

How Dimethyl Phthalate Shifts Nitrocellulose Lacquer Hardness and Adhesion

Nitrocellulose nail enamel and clear wood lacquer manufacture introduces Kanatol 100 DMP after the nitrocellulose flake has been wetted with ethyl acetate or butyl acetate. The addition level is 10–30 parts DMP per 100 parts dry nitrocellulose, and the plasticiser is frequently split with camphor or a short-chain polyester plasticiser when higher surface hardness is demanded. Mixing is carried out in a cooled stainless steel vessel with a Cowles disperser at 600–900 rpm; jacket temperature is maintained below 35 °C because solvent vapour from the lacquer is flammable. The DMP addition reduces the modulus of the dried film and improves its cold flex resistance. For nail enamel, the finished lacquer is filled into cap brush bottles and stabilised at 20–25 °C for 24 h before batch release. Film adhesion on cellulose propionate display panels is tested by cross-cut tape pull under ASTM D3359-17, and pendulum damping hardness is measured under ISO 1522:2022. DMP is not included in the current harmonised list of CMR substances under CLP Regulation (EC) No 1272/2008; nevertheless, the finished cosmetic product must be supported by a product information file under EU Regulation 1223/2009, and residual solvent and plasticiser exposure must be addressed in the safety dossier. In wood lacquers applied at 100–150 g/m² wet film weight, the dry film is sanded after 24 h and recoatability is checked after a 72 h interval. Excess DMP above 30 parts per hundred nitrocellulose produces a tacky film at 25 °C and retards lacquer print hardness; upper limits are therefore set by pendulum damping acceptance criteria rather than by a fixed addition limit.

For flexographic and gravure ink systems, Kanatol 100 DMP functions as a plasticising cosolvent and resin-solvency modifier at 2–8 wt% of the liquid ink. The pigment dispersion pass is carried out in a horizontal bead mill charged with 0.6–0.8 mm yttria-stabilised zirconia beads, with the milling chamber held at 40–45 °C; DMP is post-added during the letdown phase under low shear to avoid viscosity instability at the mill outlet. In nitrocellulose and polyamide lamination inks printed on treated polyethylene and polyethylene terephthalate, the ester slows solvent release during the drying tunnel and improves film recoatability on central impression presses operating at 250–400 m/min. Too high a DMP concentration above 8 wt% delays solvent release sufficiently to cause blocking at rewind tension settings from 120–180 N/m, and the printed roll then exhibits transfer marking. Ink viscosity is checked on a flow cup according to ISO 2431:2019, and adhesion of the printed film is assessed by a tape test under ASTM D3359-17. Packaging ink formulations are screened against REACH Annex XVII and, where food-contact printed matter is produced, against the relevant national food-contact legislation because the ink is not a direct food-contact layer. End products include reverse-printed snack packaging, self-adhesive labels, and shrink-sleeve films. The use of DMP in this segment is limited to solvent-based ink systems; its solvency is insufficient for waterborne polyurethane dispersions.

When a Low-Odour Coalescing Plasticiser Is Required in High-Solids Alkyd Enamels

Industrial alkyd enamel and metal primer manufacture incorporates Kanatol 100 DMP during the letdown phase at 2–5 wt% based on alkyd resin solids. The addition is made after the mill base has been cooled below 50 °C because DMP exposure to the highest disperser shear can temporarily raise the mill-base temperature and increase volatilisation. Pigment wetting is carried out on a high-speed disperser at 10–15 m/s tip speed, followed by bead milling; the DMP is then introduced under low shear with a pitched-blade stirrer at 200–300 rpm. DMP remains in the film during forced drying because its boiling point is 284 °C, and it reduces internal stress in films applied to grit-blasted steel at 50–80 µm dry film thickness. Drying time is measured under ASTM D1640-14, pull-off adhesion under ASTM D4541-17, and VOC content is controlled under EU Directive 2004/42/EC for the relevant product category. At additions above 5 wt%, through-dry is retarded because the phthalate remains mobile in the ambient-cured film; recoating intervals must then be extended beyond the standard 24 h window. End products include metal furniture enamels, agricultural equipment primers, and anti-corrosive maintenance coatings. DMP is not a reactive diluent in this application; it does not enter the oxidative cross-linking of the alkyd network, and its use is therefore bounded by tensile elongation requirements rather than by cure speed.

Nitrile rubber and chloroprene rubber compounds use Kanatol 100 DMP as a polar plasticiser at 5–15 phr, typically added after carbon black and silica dispersion in the second pass of an internal mixer. The ram pressure is maintained at 0.4–0.6 MPa, and the dump temperature is held below 120 °C because DMP vapour is detected in the extraction ductwork when the batch temperature is allowed to rise. Two-roll mill sheeting follows at 50–60 °C roll temperature; the plasticiser improves banding and reduces edge tearing on high-hardness NBR compounds. Cure data are collected on a moving-die rheometer at 160 °C according to ISO 6502:2018, while tensile sheets are cured and tested under ASTM D412-16. DMP lowers compound viscosity but does not function as a rubber process oil for highly extended compounds; increasing the plasticiser above 15 phr increases volatility loss during hot air ageing at 100 °C and lowers Shore A hardness in a nonlinear manner. The main end products are oil-resistant gaskets, fuel-cell gaskets, and hydraulic seal preforms. Compounds containing DMP should not be subjected to continuous service above 100 °C without post-cure volatile-loss evaluation, and their extraction resistance is lower than that of polymeric plasticisers in IRM 903 oil.

Fragrance Fixative Use in Ethanol-Based Fine Perfume Concentrates

In fine fragrance compounding, Kanatol 100 DMP is incorporated as a high-boiling solvent and fixative at 1–10 wt% of the perfume oil concentrate. The concentrate is blended in a stainless steel vessel at 20–23 °C with a gradual addition sequence to avoid local precipitation of lipophilic raw materials. After dissolution, the solution is filtered through a 0.45 µm membrane cartridge and density is checked at 20 °C against 1.19 g/cm³. Refractive index is checked against 1.5138 at 20 °C, and these two values serve as release benchmarks under ASTM D4052-18 and ISO 280:1998. The flash point of DMP is 146 °C, so the concentrate is not classified as a flammable liquid under standard GHS flash point criteria. The finished perfume product must be assessed under EU Cosmetic Regulation 1223/2009; DMP is not listed in Annex II as a prohibited substance, but the product information file must address skin-contact exposure by quantitative batch calculation. The usage level is limited by fragrance house IFRA Standards where applicable and by the desired degree of retentivity on skin. DMP is less volatile than ethanol, so it remains in the dried fragrance film and modulates the evaporation curve of top-note components. End products include eau de toilette, aftershave, and scented body sprays. Published data for DMP-specific fixative retention in fine fragrance is limited; headspace GC-MS comparison against an internally validated reference blend is used to compare emission profiles on a batch-specific basis.