Lightweight ready-mix joint compound
AssigneeUnited States Gypsum Company
InventorsSalvatore C. Immordino, Jr., Charles J. Miller, Scott A. Cimaglio, David Pickles
Life of this patent
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Abstract
The joint compound of the present invention utilizes hollow resin microspheres with a mean particle size less than 75 microns and exhibiting no more than 1.5% increase in density under high shear stress testing.
Claims18
A joint compound comprising a binder that enhances adhesion of said joint compound to a substrate, water and one or more fillers, wherein at least one of said fillers comprises hollow resin microspheres having a mean particle size of less than 75 microns, exhibits no more than 1.5% increase in density under high shear stress testing, and is present in a concentration sufficient to obtain a joint compound density less than that of water, and wherein said binder is present in concentrations of from about 1% to about 3.5% wet weight.
A joint compound composition comprising:
- a latex binder to enhance adhesion of said joint compound to a substrate, said binder being present in concentrations of from about 1% to about 3.5% wet weight;
- water;
- a thickener;
- a preservative;
- a dispersing agent;
- a calcium carbonate filler;
- dodecyl benzene sulfonic acid or a dodecyl benzene sulfonate salt;
- and
- hollow acrylonitrile copolymer microspheres having a mean particle size of less than 75 microns, exhibiting no more than 1.5% increase in density under high shear stress testing and being present in a concentration sufficient to obtain a joint compound density less than that of water.
A process of making a joint compound comprising:
- grouping components of said joint compound into wet components and dry components, said components comprising a binder to enhance adhesion of said joint compound to a substrate, water, a thickener, a preservative, a dispersing agent and one or more fillers, and wherein said binder is present in concentrations of from about 1% to about 3.5% wet weight;
- mixing said wet components together;
- mixing said dry components together;
- combining said wet and said dry components together in a main mixer;
- adding hollow resin microspheres directly to said main mixer, said microspheres having a mean particle size of less than 75 microns, exhibiting less than 1.5% decrease in volume under high shear stress testing and being present in a concentration sufficient to obtain a joint compound density less than that of water;
- and
- mixing until said joint compound is homogeneous.
Dependencies are inferred from the claim text.