Patent ID: 6277188
Filing Date: 2001-08-21
Classification: C09D

Abstract:
A special effect pigment base for use with a waterborne or solventborne coating comprising a mixture of:(i) special effect pigment selected from the group consisting of mica and metallic pigments, present in an amount between 0.1 to 60% by weight based on total weight of the pigment base,(ii) water reducible solvent borne polymeric resin having an acid number between 10 and 150 mg KOH/g of solid resin, a hydroxyl number of between 0 and 120, a molecular weight of between 2,000 and 100,000 and a Tg between -40.degree. C. and 50.degree. C., selected from the group consisting of acrylic, alkyds, acrylic modified alkyds, polyurethane, grafted acrylic polyurethane and acrylic polyurethane resins and mixtures thereof,(iii) amorphous silica present in an amount between 0.5 to 12.0% by weight based on total weight of the pigment base, and(iv) organic solvent present in an amount between 0.1 to 60.0% by weight based on total weight of the pigment base.