New liquid rheology additives for solvent-borne coatings

摘要

A new generation of liquid rheology additives has been developed, utilizing a special combination of polyamide and urea segments in one molecule. These linear or branched structure urea modified polyamide additives provide a highly pseudoplastic rheology behaviour in the paint, resulting in a remarkable improvement of sag control and anti-settling properties of solvent-borne paints. They provide a very high level of sag resistance even in airless spray applications, and can eliminate many of the difficulties with classic polyamide or hydrogenated castor oil based rheology additives such as difficult incorporation/activation or poor intercoat adhesion. Potential applications of the new additive series range from high build epoxy primers, used in marine and heavy-duty applications, to architectural and industrial coatings.