Flatted water-reducible coating compositions and method for producing same
AssigneeCabot Corporation
InventorsJohn F. Hardy, Donald P. Kintz, Vaughn W. Taylor
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Abstract
Disclosed herein are flatted water-reducible coating compositions of the varnish, paint or enamel types, which compositions comprise a water-miscible film forming resin, water as the predominant solvent and a particulate finely-divided silica flatting agent. The method of the invention involves the initial production of a mill paste formulation containing the film forming resin followed by a let-down step employing water as the predominant solvent. The silica flatting agent is introduced into the composition as an aqueous dispersion thereof during or after said let-down step.
Claims15
In a method for preparing a water-reducible coating composition comprising the steps of preparing a mill paste of the coating solids, including a water-miscible film forming resin, and thereafter letting down said mill paste with a predominantly aqueous solvent comprising at least 75 percent by weight of water, the improvement which comprises:
- flatting the composition by admixing therewith an aqueous dispersion of a finely-divided particulate silica flatting agent during or subsequent to said let-down of said mill paste, the quantity of said silica flatting agent so admixed being between about 0.25 and about 5 percent by weight of the total composition.
A flatted water-reducible coating composition comprising a water-miscible film forming resin, water as the predominant solvent therefor and finely-divided particulate silica flatting agent, said composition having been prepared by forming a mill paste of the composition solids, including said water-miscible film forming resin, thereafter letting down said mill paste with an aqueous solvent comprising at least 75% by weight water and during said let-down, or later, admixing said composition with an aqueous dispersion of said silica flatting agent, the quantity of said silica flatting agent so admixed being sufficient to provide a concentration thereof of between about 0.25 and about 5% by weight of the total composition.
Dependencies are inferred from the claim text.