PIGMENTS | BLACK AND WHITE IMAGE: SHEPHERD COLOR
Right: Shepherd Color’s CICP IR-sortable black pigment line now includes FDA FCN grades for food applications
as an NIR sortable Black,” says Daniel Llado, Market Segment Manager for Plastics at Vi- brantz. He explains that the pigment now has a specification for low magnetism to prevent any problems with pigment particles in highly loaded masterbatches being caught by magnets used in plastics processing to filter metal contaminants. Philippe Lazerme, Head of Marketing, Plastics at Heubach, says that a limitation in the use of these alternative blacks is that the cost is generally higher than traditional carbon black. As a consequence, their use is typically limited to packaging from high-end brands. “Cost in use, consistency, jetness, and food-contact approval are only some aspects that need to be considered,” he says. Heubach currently offers two grades: Graphtol Black CLN for polyolefins and Solvaperm Black PCR for PET and styrenics.
Despite those limitations, the use of NIR-visible
blacks is expected to grow. “We expect to see these black pigments used more broadly as they gain acceptance, which is why it’s crucial that the industry uses pigments that have extended conditions of use,” says Marc Dumont, Head Global Segment Management Plastics, Colour Materials at Sun Chemical. He cites the company’s Sicopal Black K 0098 FK, which was extended from two-percent use level for FDA food contact conditions of use A-H to additionally include condition J, which allows use in microwaveable and oven ready food packaging. “PET trays remain a large opportunity for recycling black plastics applications, especially in food contact applica- tions,” he says.
Dumont adds that while the current product is a low-dusting powder form, Sun Chemical will soon introduce Microlen Black K 0098 MP, an NIR-visible black pigment in a fully dispersed pigment preparation form. “It has high colouring efficiency and is easy to mix with [polyolefin] resins as virgin or recyclate.” The company says the pigment preparations are fully dispersed, free-flowing and easy to meter. “They are the more efficient way to colour when
compared to their powder counterparts. With advantages such as shorter change-over times, easier cleaning for production lines and significant reduction in reworking production batches, they are gaining a lot of momentum as we engineer new colour solutions,” says Dumont. US-headquartered Shepherd Color recently added FDA food contact notification approval to its CICP IR-sortable black pigments. Black 10F925 has a deep, neutral masstone colour for plastics supplied by resin manufacturers, while Black 10F951 has higher opacity and greater tint strength for colouring PCR material, according to Mark Ryan, Marketing Manager at the company.
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