Dry mix-type joint compounds, compositions therefrom and methods for filling drywall joints with same

Abstract

A dry mix-type, drywall panel joint compound is produced which comprises (a) a fine plaster which is applied to a joint formed between adjacent drywall panels in the plastic state to form a hardened material, (b) a material which imparts internal strength and workability to the joint compound, (c) a material for retaining water and inhibits shrinkage of the joint compound within the joint formed between adjacent drywall panels, and (d) a set time control agent. The more preferred joint compound formulation of this invention includes (a) stucco, (b) methyl cellulose, and (c) perlite. A longer set time version of the subject dry mix-type, drywall panel joint compound can also be provided which comprises, in addition to (a)-(d), (e) at least one water absorption agent, (f) at least one shrinkage and cracking inhibitor, (g) at least one adhesive strengthening agent, and (h) an alkaline material for raising the pH of material. The more preferred longer set time joint compound formulation comprises (e) mica, (f) bentonite clay, (g) vinyl acetate and/or vinyl alcohol, and (h) calcium hydroxide.

Dependencies are inferred from the claim text.