Abstract: The present invention provides a low dusting joint compound comprising a filler, a binder, a thickener and one or more synthetic polymeric waxes that are at least slightly soluble in water and are solid at room temperature. Preferably the wax includes a high molecular weight polyethylene glycol or methoxy polyethylene glycol having an average melting point of from about 80° F. (27° F.) to about 150° F. (80° C.). These additives impart low dusting properties without a sticky or oily feel. High molecular weight synthetic waxes also act as an internal binder to hold the joint compound together and improves paint gloss retention. The invention results in a joint compound with improved properties for drywall finishing.
Type:
Grant
Filed:
March 8, 2002
Date of Patent:
January 6, 2004
Assignee:
United States Gypsum Company
Inventors:
Salvatore C. Immordino, Jr., Richard B. Stevens
Abstract: A coating for gypsum board includes a binder, a soy protein, and two or more pigments. Two of the pigments include calcium carbonate and magnesium carbonate and the magnesium carbonate makes up at least 20% by weight of the coating on a dry basis.
Type:
Grant
Filed:
December 19, 2001
Date of Patent:
December 16, 2003
Assignee:
United States Gypsum Company
Inventors:
Subhash Deodhar, Tom Haugeberg, Robert Negri