Coating for wall construction
View Patent ↗A coating for wall construction is provided whereby a level 5 finish may be obtained without the need for a finishing coat or final skim coat. The coating may be applied to drywall elements prior to installation and is compatible with jointing materials such that a substantially homogeneous surface may be obtained after the drywall elements are assembled with jointing material and the jointing material is dried. The coating formulation includes a noncellulosic thickener, a binder, a mineral filler and water. A method for the construction of interior walls and a construction assembly for interior walls is further provided.
1. A coating formulation for drywall application comprising water, a binder present in an amount of between about 1.0% and about 4.0% by weight, a filler having a D50 between 5 and about 35 μm, said filler comprising at least about 60% by weight CaCO 3 , and a polymeric noncellulosic thickener, wherein the coating formulation does not contain any cellulosic thickener and the viscosity of the coating formulation is from about 250 to about 1200 cps,
further comprising a dispersant, and
further comprising about 0.1 to about 20% by weight anti-cracking agent and about 0.1 to about 5% by weight workability agent.
2. The coating formulation of claim 1 , wherein the anti-cracking agent is mica and the workability agent is clay.
3. The coating formulation of claim 1 , wherein the dispersant is present in an amount of about 0.5 to about 15% by weight and the thickener is present in an amount of about 0.05 to about 50% by weight.
4. The coating formulation of claim 1 , wherein the binder is a latex binder.
5. The coating formulation of claim 4 , wherein the binder is an acrylic latex binder.
6. The coating formulation of claim 5 , wherein the dispersant is present in an amount of about 0.5 to about 15% by weight and the thickener is present in an amount of about 0.05 to about 50% by weight.
7. A coating formulation for drywall application comprising water, a binder present in an amount of between about 1.0% and about 4.0% by weight, a filler having a D50 between 5 and about 35 μm, said filler comprising at least about 60% by weight CaCO 3 , and a polymeric noncellulosic thickener, wherein the coating formulation does not contain any cellulosic thickener and the viscosity of the coating formulation is from about 250 to about 1200 cps,
further comprising a dispersant, and
wherein the dispersant comprises a sodium polyacrylate.
8. A coating formulation for drywall application comprising water, a binder present in an amount of between about 1.0% and about 4.0% by weight, a filler having a D50 between 5 and about 35 μm, said filler comprising at least about 60% by weight CaCO 3 , and a polymeric noncellulosic thickener, wherein the coating formulation does not contain any cellulosic thickener and the viscosity of the coating formulation is from about 250 to about 1200 cps,
wherein the thickener comprises a copolymer of an acrylic acid and an acrylic ester.
9. The coating formulation of claim 8 , wherein the filler comprises at least about 75% by weight CaCO 3 .
10. The coating formulation of claim 1 , wherein the filler comprises at least about 75% by weight CaCO 3 .
11. A coating formulation for drywall application comprising water, a binder present in an amount of between about 1.0% and about 4.0% by weight, a filler having a D50 between 5 and about 35 μm, said filler comprising at least about 60% by weight CaCO 3 , and a polymeric noncellulosic thickener, wherein the coating formulation does not contain any cellulosic thickener and the viscosity of the coating formulation is from about 250 to about 1200 cps,
wherein the filler further comprises magnesium carbonate, dolomite, gypsum, anhydrite, or mixtures thereof.
12. A coating formulation for drywall application comprising:
about 1 to about 4% by weight of a latex binder,
about 40 to about 70% by weight of a filler having a D50 between 5 and about 35 μm and comprising at least about 60% by weight CaCO 3 ,
about 0.5 to about 15% by weight of a dispersant,
about 0.05 to about 50% by weight of a polymeric noncellulosic thickener, and
water in an amount sufficient to provide a viscosity for the formulation of about 300 to about 450 cps,
wherein the coating formulation does not contain any cellulosic thickener.
13. The coating formulation of claim 12 , further comprising about 0.1 to about 20% by weight anti-cracking agent and about 0.1 to about 5% by weight workability agent.
14. The coating formulation of claim 13 , wherein the anti-cracking agent is mica and the workability agent is clay.
15. The coating formulation of claim 13 , wherein the dispersant comprises a sodium polyacrylate.
16. The coating formulation of claim 12 , wherein the formulation comprises
about 45 to about 65% by weight of a filler comprising at least about 75% by weight CaCO 3 ,
about 2.0 to about 9.0% by weight of a dispersant,
about 0.1 to about 5.0% by weight of a noncellulosic thickener.
17. The coating formulation of claim 12 , wherein the latex binder comprises an acrylic latex binder.
18. The coating formulation of claim 12 , wherein the thickener comprises a copolymer of an acrylic acid and an acrylic ester.
19. The coating formulation of claim 12 , wherein the filler comprises at least about 75% by weight CaCO 3 .
20. The coating formulation of claim 13 , wherein the filler comprises at least about 75% by weight CaCO 3 .
21. The coating formulation of claim 12 , wherein the filler further comprises magnesium carbonate, dolomite, gypsum, anhydrite, or mixtures thereof.