colour | Pigments
Right: Rhein Chemie has
developed its Macrolex Gran granular
pigment format to offer
improved
dispersion and processing
There have also been requests for US Food and Drug Administration (FDA) certification for older dyes and fluorescents that are not FDA certified. The company says that, historically, yellow and red
have not been as capable of surviving harsh weather conditions. As a result, compounders seek out suppliers that provide yellow and red colours with improved weatherability. It says it is currently working on developing more efficient ultraviolet and antioxidant packages and is currently testing several synergistic packages for customers. Carolina Color introduced the highly-loaded G2 line
of colourants in 2008 and the G3 family in 2015, in addition to developing new carrier systems for PA, PC and PET. G2 is a material-based solution that puts more colour and additive into a smaller package. The company says it provides benefits such as reduced processing temperature and faster cleanout when changing from one colour to another. The G3 system provides even higher loading of pigments and is said to run on just about any resin system. It can achieve a more than 20% increase in pigment loading levels in polyethylene and polypropylene, according to the company, without the typical penalties associated with processing rate or pigment dispersion. Some G3 formulations for the packaging market can comprise up to 45% organic pigment. In addition, G3 technology is capable of 50% or more loadings of pearlescent pigment, which Carolina Color says is near double the industry standard of 30%. G3 products are claimed to be effective in diverse applications such as packaging, housewares, transportation and lawn and garden. Carolina Color also offers G3 for polycarbonates.
These are highly loaded and include special effects such as pearlescent pigments. They can be used for injection moulding and extrusion applications. The com- pany says that the colourants are not detrimental to physical properties and carrier resins can be supplied with tailored melt flow and formulated with stabilisers. Functional additives such as mould releases, UV stabilisers and matting agents can also be used. The Carolina Color UltraPET colourant line targets
applications in cosmetic packaging, vitamin bottles, nutraceuticals, sample liquor bottles, spice jars and thermoformed sheet, for example. Key attributes include a low melting polymeric carrier that has good compatibility with the base polymer (the company says the polymeric carrier will not migrate and cause screw slippage issues). The mini bead format means more pellets per gram and a larger surface area, which helps with colour distribution especially at the lower usage rates required for tints. The company says the colourant melts at a significantly lower temperature than
36 COMPOUNDING WORLD | September 2016
traditional PET based carriers and has improved rheology and larger surface area leading to a faster incorporation rate. UltraPET also offers compatibility with PET bottle resins - high loading capability and recrystallisation is not needed. Drying may also not be required at low use rates for tints. The company says the system can also offer lower housekeeping costs compared to liquid colour and is FDA compliant. For polyamides, the company offers concentrates with higher pigment and dye loadings of 20-30%, as well as higher loading of UV stabilisers and antioxidants of 20-30%. Lower use rates of 30-50% are said to be possible and the system can be modified for use in PA6, PA66 and other speciality polyamides. Applications include compounds for moulded goods such as housings, machine parts, electrical connectors, power tool handles, appliances, and extruded applications like monofilaments for fishing lines, trimmer lines, toothbrush bristles and jacketing for wire and cable.
Dispersion solutions Riverdale Global has developed its Single-Pigment Dispersion (SPD) technology to formulate its range of liquid colours, which it claims offers performance benefits to users. “While the conventional method of manufacturing liquid colour is simply to add pigments one at a time to a liquid carrier and then blend them, Riverdale Global disperses only one pigment in liquid, then mills this dispersion to maximise colour strength, brightness and uniformity,” says a company spokesper- son. “As a result, processors using colourants based on SPDs can achieve full colour at lower let-down rates than with conventional liquids. The SPDs are produced at one location only, at Perth Amboy, NJ in the US, and inventoried at Riverdale Global satellite locations, where they are blended to match customer specifica- tions. Additives can be included in blends along with
www.compoundingworld.com
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