Acrylic latex wood filler composition and method of making same
View Patent ↗In broadest terms, a wood filler composition of the present invention comprises: from about 11.50 to about 17.50 weight percent water; from about 14.40 to about 21.60 weight percent ceramic microspheres; from about 2.48 to about 3.72 weight percent wood flour; from about 0.32 to about 0.48 weight percent thickener; from about 0.80 to about 1.20 weight percent glass bubbles; from about 12.24 to about 18.36 weight percent acrylic latex emulsion; and from about 36.06 to about 54.10 weight percent calcium carbonate. The composition preferably has a pH in the range of from about 8.4 to about 8.8. Further the composition preferably has a viscosity of 200,000 to 300,000 cps as measured on a BROOKFIELD RV viscometer (helipath on) with a T/E spindle at 20 rpm and 25° C.
1. A wood filler composition, said composition comprising:
from about 11.50 to about 17.50 weight percent water;
from about 14.40 to about 21.60 weight percent ceramic microspheres;
from about 2.48 to about 3.72 weight percent wood flour;
from about 0.32 to about 0.48 weight percent thickener;
from about 0.80 to about 1.20 weight percent glass bubbles;
from about 12.24 to about 18.36 weight percent acrylic latex emulsion containing about 46 to about 48 weight percent solids; and
from about 36.06 to about 54.10 weight percent calcium carbonate, wherein said composition has a pH in the range of from about 8.4 to about 8.8, said composition having a viscosity of from about 200,000 to about 300,000 cps.
2. The wood filler composition according to claim 1 wherein said wood flour is a 60-mesh sized wood flour.
3. The wood filler composition according to claim 1 wherein said thickener is a methyl cellulose thickener.
4. The wood filler composition according to claim 1 further comprising at least one biocide.
5. The wood filler composition according to claim 1 further comprising at least one surfactant.
6. The wood filler composition according to claim 1 further comprising at least one stabilizer.
7. The wood filler composition according to claim 6 wherein said at least one stabilizer comprises a freeze-thaw stabilizer.
8. The wood filler composition according to claim 1 further comprising at least one mildewcide.
9. The wood filler composition according to claim 1 further comprising at least one pigment dispersant.
10. The wood filler composition according to claim 8 further comprising at least one colorant.
11. A method for preparing the wood filler composition of claim 1 , said method comprising the steps of:
providing a mixing vessel;
placing water, at least one biocide, at least one surfactant, and at least one stabilizer in said mixing vessel under slow agitation;
mixing until substantially homogeneous;
adding at least one acrylic latex emulsion to said mixing vessel while agitating;
mixing until substantially homogeneous;
adding at least one ceramic microsphere and at least one wood flour to said
mixing vessel while agitating;
mixing until homogeneous;
adding at least one mildewcide to said mixing vessel while agitating;
mixing until substantially homogeneous;
adding water and at least one surfactant to said mixing vessel while agitating;
mixing until substantially homogeneous;
adding at least one glass bubble to said mixing vessel under slow agitation;
mixing until substantially homogeneous; and
adding water to said mixing vessel in sufficient quantity so as to produce a wood filler composition having a viscosity of from about 200,000 to about 300,000 cps and a pH of from about 8.4 to about 8.8.
12. The method according to claim 11 additionally comprising the step of: adding at least one pigment dispersant to said mixing vessel.
13. The method according to claim 11 additionally comprising the steps of:
adding at least one pigment to said mixing vessel; and
mixing until said at least one pigment is evenly dispersed.
14. The method according to claim 11 wherein at least one of said at least one stabilizer is a freeze-thaw stabilizer.