OCCA is continuing to monitor the ongoing situation with respect to the outbreak of coronavirus (COVID-19). We are following official UK government guidelines, which advise on how to contain, delay and mitigate the spread of the virus.
In line with the most recent government official guidance, all face to face OCCA meetings and events have been cancelled until further notice. However, we are focusing our efforts into providing a number of new online initiatives, including our newly launched Weekly Webinar series, Council & team meetings, networking and social events, primarily via our new Zoom platform.
Please see our website and social media platforms for details of all planned events, including booking links where appropriate.
Date: Wednesday 23rd June 2021
Time: 14:30 – 15:30
Our Series 4 of OCCA Weekly Webinars continues with "Hostatint A 100-ST: A super-transparent pigment dispersions range: delivering the look of dyes with performance pigments" presented by Alexander Woerndle & Bernhard Stengel-Rutkowski, Technical Marketing Managers of Clariant.
This webinar is free to attend, simply register below and you'll receive further details & joining instructions in due course.
Dyes, unlike pigment crystals, dissolve in the application media to individual molecules. Such a dye solution is easy to make and results in the maximum clarity and color saturation of a coating film. However, the individual molecules have high mobility even in the cured coating, leading to phenomena like bleeding and poor solvent fastness. Further, colors made with dyes are prone to fading by UV light.
By contrast, pigments, though nano-scale materials, require a sophisticated dispersion process and due to the scattering of light at the crystals, can result in paler, less saturated, or even opaque colors of coatings. A key benefit, however, is the crystalline structure of the colorant restricts the mobility of the pigment in the cured film, resulting in excellent solvent fastness and much improved resistance to UV light.
With Hostatint A 100-ST we merge the best of both worlds: Ready-to-use concentrates of highly durable pigments with particles so small that the color properties of dyes can be matched.
Speaker Profile - Alexander Woerndle
Technical Marketing Manager
Alexander has a University background in colloid and polymer chemistry, is holding a Ph.D. in polymer science from Technische Universität München and has been working with Clariant for more than 15 years, first in various R&D roles relating to pigments, pigment dispersions and dispersants and since 2011 in application engineering roles catering to the European and Global Coatings industry.