As the regulations drive allowable VOC levels
in paint formulations lower, these performance properties can become more
difficult to achieve. In order to achieve low-VOC coatings, the paint
formulator either uses latex with a low glass transition temperature (Tg), or
one with high amounts of non-volatile film formers. Unfortunately, both
solutions can lead to poor block resistance, poor early water resistance and
poor dirt resistance.
This problem can be overcome by using
Acronal Optive® 130 from BASF, which is a multiphase latex with soft
and hard phases on each latex particle. The soft phase aids in continuous film
formation, whereas the hard phase helps to create outstanding block and dirt
resistance.