4.1 Ultra High Solids Grinding Resin
(Room 234-236)
09 Apr 18
2:00 PM
-
2:30 PM
Tracks:
Session 4: Grinding & Dispersing, Session 4: Novel Materials
Increasingly stringent environmental regulations continue to challenge the coatings industry to reduce emissions while improving film properties at the same time. This has led to opportunities in coating resin design and synthesis. Over the last decade a number of highly innovative applications in acrylic polymerization have emerged that enable the synthesis of a variety of complex architectures aimed at improving the solids-viscosity profile of coatings without sacrificing performance. We have developed a novel polymerization process that provides polymers having guaranteed functionality, uniform functionality distribution and narrow polydispersity.
In coatings formulations, the VOC of the pigment dispersion is one of the major limiting factors in attaining low VOC of the coatings. If the solids of the pigment dispersion are lowered it gives an excellent opportunity to lower the VOC of the entire paint-line, which wouldn’t be possible otherwise.
In this paper we describe a novel ultra-high solids (90% NVM) acrylic polyol as an efficient grinding resin. Using mass spectrometry we have demonstrated that each polymer chain contains at least one hydroxyl functionality (guaranteed functionality), which is necessary for good wetting as well as for good film properties. We have also observed a three-fold advantage of the novel grinding resin of lowering the VOC, increasing the pigment concentration of the grind, and shortening the grind time of the mill-base. We have demonstrated these advantages by using difficult to grind pigments like jet carbon black and organic perylene maroon. This technology offers tremendous value for protective and automotive coatings.