Solvent Dyes

One type of non-polar organic solvents that is commonly used with oil dyes is petrol. Accordingly, oil solvent dyes are often used in the automotive industry to colour petrol fuel and other hydrocarbon-based fuel oils. .

Oil soluble solvent dyes have better temperature stability in engineering plastics, very high brightness and do result in completely transparent plastics without any haze and light scattering. Processing is easy and process parameters like viscosity remain unaffected. Process conditions for engineering plastics like polystyrene, ABS, PC, PMMA, PA and others are quite severe.

Oil soluble dyes are widely used in rubbers, oil inks, spinning, waxes, smoke, paints, color paste, transfer printing, marking pens, ball point pens, candles, oil, fats, solvents, bitumen, lubricants, marking inks, inkjet printing inks, dye sublimation printing, glass coloration, signalling smoke, firework and in the pyrotechnics industries, gold imitation, other transparent metallic effects of metallized polyester films, other hydrocarbon-based nonpolar materials.

Commodity polymers like Polyethylene, polypropylene, plasticized PVC or rubber are soft at low temperatures. we do not recommend any solvent dyes for coloration of these polymers but pigment powders have to be used.

Nigrosine Blacks include oil soluble nigrosine (C. I. solvent black 7), spirit soluble nigrosine or alcohol soluble nigrosine (C. I. solvent black 5), MS conc nigrosine (C. I. acid black 2) and aniline black (C.I. pigment black 1). All Nigrosine do show absorption in the infrared light making them suitable for optical character recognition. They are suitable for inkjet inks, ball point pen inks, solvent marker pen inks, water sign pen inks, industrial inks, ribbon inks, carbon paper, shoe polish, plastics, phenolic resin, polyamide resin, urea resin, lacquers, varnishes, wood stains, leather, cotton, flax, metallic products, coatings, alcohol based oil soluble self-drying alkyd coatings, nitryl paints, water based coatings, thermosetting coatings, stationery commodities, alcohol based printing ink, plastics application such as acrylic resin, unsaturated polyester resin, fibrin resin, Bakelite, polyester alkyd, polyvinyl chloride, polycarbonate, polystyrene, polypropylene, non-water soluble colouring of leather and fur, coatings, printing ink, positive charge control agent in electrostatic printing powder, colouring for stationery.

Metal-complex solvent dye is shorted as metal-complex dyes, these are mainly anionic chromium and cobalt complexes of azo dyes. These dyes are normally soluble in alcohols, glycol ethers, ketones and esters.

Metal-complex solvent dyes own following advantages: 1. excellent solubility; 2. good compatibility with most resins; 3. bright colours; 4. excellent chemical resistance; 5. free of heavy metals; 6. liquid form is available.

Their very nature - soluble in non-polar mediums - allows their versatility and many uses. Oil or solvent dye is used in applications such as foil printing, printing inks, marking pens, ball point pens, candles and other waxes, polishes, leathers, wood stains, acrylic resins, varnishes & shellacs. They are used in signalling smoke and in the pyrotechnics industry. These dyes are also used to colour lubricants in the automotive and industrial cutting industries. However, the most frequent application of solvent dyes is in the plastics industry. Within the Indus-trial plastics community, solvent-based dyes are used to colour a variety of solid materials, such as acetates, nylon, polyester, acrylics, PVC, PMMA, PETP, polystyrene and styrene monomers.