colour feature | Pigments
nies’ inorganic chemistries should deliver a broader portfolio in the blue, beige, green and black colour space. One example is the blue undertone enhancement with Nubiperf SRD of a cool Pigment Brown 29 (V-785) to give a “cool black” formulation for injection moulded PP parts. There is said to be no detrimental effect on Total Solar Refl ectance (Figure 1).
Capuz also cites Nubix V-40, which he says is a unique bright reddish undertone ultramarine violet (PV15) with high tinting strength. “This new product will allow customers to access a new ultramarine violet shade with higher tinting strength than conventional reddish ultramarine violets,” he says.
Figure 1: Chart showing that use of Nubiola’s Nubiperf SRD ultramarine blue with Pigment Brown (V-785) to create a “cool black” formulation does not impact on Total Solar Refl ectance. The 1% V-785 and 1% V-785 + 1% Nubiperf SRD curves overlap. The black line shows results for carbon black. Source: Nubiola
Figure 2: Performance of Nubiola’s high tinting strength Nubix V-40 ultramarine violet in LDPE against current alternatives Source: Nubiola
sion of service life in plastics that are sensitive to heat. Cobalt blue (PB 28) and chrome titanate (PBr 24) are
considered the current benchmark “cool” pigments for cool blue and beige. Nubiola global marketing manager Alex Capuz says the addition of the new products to the cool pigments family will allow colour-matching teams and formulators to expand their colour space with highly cost effective pigments. “Moreover the recent acquisition of Nubiola by Ferro Corporation, a world leading producer of solutions based on ‘cool’ pigments, will create synergies in the high IR refl ectance fi eld,” he says. Ferro completed its acquisition of Nubiola, fi rst
announced in April (see CW May 2015), in early July. Capuz says the combined strengths of the two compa-
24 COMPOUNDING WORLD | September 2015
Nubix V-40 is produced with what he says is a novel proprietary technology developed by Nubiola (details are confi dential). It shows the same performance in plastics applications as Nubiola’s conventional ultramarine violets in terms of heat fastness (300°C, 5 min), high weather resistance, ease of dispersion, good dimen- sional stability, and regulatory compliance. “Therefore it is highly suitable for mass-tone and tint violet coloura- tion of all sort of food and cosmetics packaging, consumer goods and other applications, Capuz says. He also highlights the ability of Nubix V-40 to tint whites with a neutral shade to eliminate yellowness coming from the polymer or from titanium dioxide (Figure 2). At Shepherd Color, marketing manager Mark Ryan agrees that cool pigments are currently a hot topic. The company specialises in CICP (Complex Inorganic Colour Pigments) that are claimed to provide durable colour in demanding applications where heat, chemicals, UV and weathering conditions mean other pigments may fail. Ryan highlights the company’s Arctic line of pig- ments, which refl ect near-infrared radiation and selectively absorb visible light. He says Shepherd Color now has a “black rainbow” of optimised IR-refl ective Arctic Black black pigments with different tints (blues, browns) and tailored properties for specifi c applications.
The future is yellow When BASF acquired Ciba in 2009, it was obliged by the European Commission to divest Ciba’s global business in Irgazin and Irgacolor bismuth vanadate (BV) and Cromophtal and Irgazin indanthrone blue pigments businesses in order to maintain competition in the market. Those businesses were bought by Dominion Colour (DCC) in 2010, complementing its existing organic and inorganic high performance pigment product lines. DCC rebranded the products as DCC Yellow and DCC Blue respectively. Earlier this year, both BASF and DCC said they would
increase production capacities of BV pigments in response to market growth. The additional capacity at
www.compoundingworld.com
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