Patent ID: 8691907
Filing Date: 2014-04-08
Classification: C08G,C08K,C08L,C09D

Abstract:
1. A water-borne stain blocking primer comprising a) from about 10 to about 30 wt % based on total solids content of the primer of a water-dispersible, hydrophobic alkyd resin having an acid number of less than 40 KOH/g; b) from about 5 to about 30 wt % of a platelet-shaped pigment based on total solids content of the primer, the platelet-shaped pigment having an average aspect ratio of at least about 3:3:1; c) from about 0.05 to about 3 wt % of a tannin chelation agent based on total solids content of the primer; d) from about 0 to about 20 wt % of a water-dispersible, hydrophobic free-radically polymerized copolymer; e) a hydrophobically modified associative rheology modifier in an amount effective to provide a water-borne primer having an ICI viscosity of from about 0.5 to about 3.0 poise; and a KU viscosity range of from about 80 to about 120 Krebs units; and f) water; wherein the water-borne primer has a VOC content of less than 5 wt %.