High solids sag resistant cycloaliphatic epoxy coatings.

摘要

Sprayable, thermosetting, sag-resistant coating composition comprising at least 50 weight percent nonvolatiles comprising: (a) 100 weight parts of a crosslinkable cycloaliphatic epoxy containing at least one cycloaliphatic ring, (b) 0 to 300 weight parts of a crosslinking/chain-extending agent compatible with and capable of crosslinking and/or chain-extending said epoxy, and (c) a sag control system comprising, (1) 2 to 15 weight parts of an acrylic microgel, and (2) 5 to 35 weight parts of an organic polymer having a glass transition temperature of at least 25 DEG C. Sag control compositions for controlling sag in cycloaliphatic epoxy coatings comprising: (a) an acrylic microgel, and (b) an organic polymer having a glass transition temperature of at least 25 DEG C., in a weight ratio of said microgel to said polymer in the range from 1:4 to 4:1.