ADDITIVES | PIGMENTS
PET and thus can provide bright and transparent shades, he says. PET is typically coloured using either liquid
Above: Altaris W440 is the latest IR reflecting pigment from Venator for white and bright coloured applications
improve impact strength or impart counterfeit detection capability. Earlier this year Venator (formerly the pigments division of Huntsman) launched a new addition to its Altiris range of infrared reflecting titanium dioxides. Altiris W400 pigment is suitable for use in cool white, near-white, bright color and pastel shade plastics. It offers a larger crystal size, narrow particle distribution, high crystalline purity and dense silica coating that current offerings; the company says a larger crystal size shifts reflectance across the solar spectrum and ensures a greater proportion of near infrared light is reflected. Iriotec 8826 is the latest addition to Merck’s 8000 series of laser marking pigments. Supplied in powder form, it is intended for applications in coloured polymers where it can be incorporated with minimal impact on the base colour. The new pigment is said to be activated so quickly by infrared laser light that is can be used to mark PE films, which the company claims is a completely new application area for laser marking additives.
Right: Iriotec 8826 is a new fast-activating laser marking pigment from Merck for cable and film applications
PET conversion Brand owner moves to more transparency and colour in packaging is driving a switch from polyolefins to PET, according to Clariant. Such a change impacts colorants because PET and polyolefins have very different molecular and crystalline compositions, different migration behaviour, and varying heat stability. “Processing temperatures of PET are much higher than for polyolefins – for example, HDPE bottles are processed at around 230-250 °C while PET bottles are processed around 280-300 °C – therefore color- ants used for PET must withstand higher tempera- tures,” says Stefan Wannemacher, Head of Techni- cal Marketing Plastics in Clariant’s Pigments Business Unit. Clariant’s Solvaperm and Polysyn- thren grades are designed for the colouration of
62 COMPOUNDING WORLD | September 2017
colour, wax-based concentrate, or a pellet concen- trate with a PET carrier. Carolina Color’s new UltraPET pellets are made with a polymeric carrier system that is highly compatible with PET and overcomes the challenges of these traditional systems, according to the company. In particular, it says UltraPET does not require recrystallisation (as PET-based pellets might), may not require drying if used at low rates for tints, and can achieve colour loadings similar to that of liquid colour or wax- based concentrates without the risk of migration or screw slippage problems. Carolina Color says it achieves its high pigment loadings through the use of its G2 technology, which was originally developed for outdoor applications to deliver UV protection additives together with colour pigments. The company also has a G3 carrier technology, designed for packag- ing and engineered materials, which is said to deliver a 25-35% higher pigment loading than the G2 system and is useful where it is necessary to combine high loadings of colorants, special effects, and functional additives. New from Holland Colours, Holcopearl 2287 masterbatch for PET packaging is designed to give deeper colour with optimal dispersion on high- speed, automated production lines. “Packaging plants today are increasingly automated and focused on high efficiency. Trends include moves to higher production speeds, deeper colours, more sensitive dosage settings, and the switch to spherical PET granules instead of cylindrical ones,” says Wilfried Grob, Sales & Marketing Manager Europe at Holland Colours. The Holcopearl 2287 product offers a high melting point and is supplied as round granules
www.compoundingworld.com
PHOTO: VENATOR CORP
PHOTO: MERCK
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86
