COLOUR | PIGMENTS
engineering plastics, which have high processing temperatures that create challenges for colouring. “In the case of organic pigments, high processing temperatures often lead to accelerated decompo- sition; however, inorganic alternatives can also be subject to colour fluctuations at temperatures above 180° C.”
High temperatures Bartolucci said that Lanxess’ Colortherm Yellow product range for high-temperature polymers consists of inorganic pigments that cover both the colour spectrum of bright, saturated yellow and orange tones to allow formulations that can be processed at up to 300° C, which is important for polymers such as polyamide, polypropylene and polyphenylene sulphide. Tosaf has launched PPAX, a new colour master-
batch carrier system which is based on the high- performance polymer polyphthalamide (PPA) and whose specially selected pigments allow high processing temperatures. The company says processors using PPAX can take advantage of the high melt temperatures possible with PPA, for example to shorten cycle times, without being limited by the colour masterbatch. Testing carried out by Tosaf Color Service at processing tempera- tures of up to 340° C yielded “outstanding” results, according to the company. Rudolf Reinhart, Product Manager at Tosaf Color
Service, said: “PPAX enables us to meet the requirements of industries in which electrical and electronic components are exposed to high thermal loads. These include, in particular, the automotive industry with its focus on e-mobility, as well as manufacturers of kitchen appliances and white goods, which require colour-coded plug connectors for a wide range of electrical outlets.” A new transparent red pigment from pigment
supplier Heubach, Vynamon Red 325405, is an especially transparent version of the diketopyrro- lopyrrole (DPP) chemistry pigment. Transparency can be visualised by applying the pigmented system to a black background whose darkness is retained in case of high transparency or reduced in case of high opacity. The pigment scattering also increases the opacity of the layer and the respec- tive haze value, which can be used as an indicator
Red pigment haze
PP + 0.10% Standard DPP red PP + 0.10% Vynamon Red 325405 Source: Heubach
22 COMPOUNDING WORLD | September 2024
Haze [%, 1 mm] 91 75
Ampacet has expanded its ELTech product range to include
a range of solutions that have been specifically formulated to respond to the stringent requirements of the fiber optic cable market
for the visual appearance of transparency to the human eye, Heubach says. The table shows the lower haze value of Vynamon Red 325405 com- pared to a standard DPP red in a nucleated PP random copolymer. The latest from Ampacet is a range of high- performance colour masterbatches based on a polybutylene terephthalate (PBT) carrier resin and specifically designed for optical fibre cable PBT jacketing, added to the masterbatch provider’s ELTech portfolio. “The significant increase in consumer and business demand for high-speed internet has resulted in dramatic growth in the fibre optic cable market,” said François Thibeau, Ampacet Strategic Business Manager E&E, in a press release. “We have responded to customer needs by expanding our ELTech range to include colour masterbatches for optical fibre cable.” For ease of installation, optical fibre cable manufacturers use a colour-coding system such as the RAL system to identify individual optical fibres, Ampacet explains. ELTech masterbatches include 16 colours that comply with RAL colour references, and custom colours can be developed upon request. The colorants preserve high-performance signal transmission and provide opacity at a low addition rate and high resistance to heat and colour fading.
Laser-marking Laser-marking effect additives enable processors to manufacture parts that can be permanently marked with QR codes, bar codes, serial numbers, logos, or other designs; advances in this area now allow colours on dark surfaces. Laser marking is useful in a range of applica-
tions, including packaging, automotive interiors, and others, where it provides permanent, abrasi- on-resistant marking to deter forgery, says master- batch producer Lifocolor. Lifocolor’s newest additive for white laser marking of dark substrates
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