Labeling paint and method for the manufacture thereof

Abstract

The present invention provides a stable, labeling paint suitable for use on an OSB finishing line in conjunction with metal stencils, and a method for making the labeling paint.

1 . A water-based paint composition, comprising: 
 (a) an opacifying agent;    (b) a polymeric binding agent; and    (c) a debonding agent active on metal surfaces.    
     
     
         2 . The composition of  claim 1  further comprising at least one of a viscosity enhancing agent, a surfactant, a preservative, an optical brightener, a plasticizer, a dispersing aid, a coalescing aid, and a defoaming agent.  
     
     
         3 . The composition of  claim 1 , wherein the opacifying agent comprises titanium dioxide.  
     
     
         4 . The composition of  claim 2 , wherein the viscosity enhancing agent is at least one of a soluble nonionic polysaccharide and a suspended particle-type viscosity enhancing agent.  
     
     
         5 . The composition of  claim 4 , wherein the soluble nonionic polysaccharide is at least one of hydroxyethylcellulose and carboxymethylcellulose.  
     
     
         6 . The composition of  claim 4 , wherein the suspended particle-type viscosity enhancing agent comprises fumed silica.  
     
     
         7 . The composition of  claim 2 , wherein the surfactant is at least one of a nonionic surfactant and an anionic surfactant.  
     
     
         8 . The composition of  claim 7 , wherein the anionic surfactant comprises a salt derived from morpholine and a long-chain carboxylic acid.  
     
     
         9 . The composition of  claim 8 , wherein the long-chain carboxylic acid is at least one of stearic acid, palmitic acid, and myristic acid.  
     
     
         10 . The composition of  claim 1 , wherein the polymeric binding agent comprises a latex having a glass transition temperature greater than about 25° C.  
     
     
         11 . The composition of  claim 10 , wherein the latex comprises a copolymer of butylacrylate and methyl methacrylate.  
     
     
         12 . The composition of  claim 11 , wherein the copolymer has a glass transition temperature of about 32° C.  
     
     
         13 . The composition of  claim 11 , wherein the copolymer has a pH from about 8 to about 9.  
     
     
         14 . The composition of  claim 1 , wherein the debonding agent is at least one of a vegetable oil, a silicone oil, and a mineral oil.  
     
     
         15 . The composition of  claim 14 , wherein the vegetable oil is at least one of soybean oil, corn oil, sunflower oil, castor oil, rapeseed oil, linseed oil, sunflower seed oil, and safflower oil.  
     
     
         16 . The composition of  claim 1 , wherein the composition exhibits no sediment formation for about at least two months when stored at about 20° C.  
     
     
         17 . The composition of  claim 1 , wherein the composition exhibits no phase separation for about at least two months when stored at about 20° C.  
     
     
         18 . The composition of  claim 1 , wherein the composition is spreadable at rate of from about 10 to about 300 g/m 2 .  
     
     
         19 . The composition of  claim 1 , wherein the opacifying agent is present in the composition in an amount from about 0.5 to about 35 percent by weight based on the total weight of the composition.  
     
     
         20 . The composition of  claim 2 , wherein the viscosity enhancing agent is present in the composition in an amount from about 0.5 to about 10 percent by weight based on the total weight of the composition.  
     
     
         21 . The composition of  claim 2 , wherein the surfactant is present in the composition in an amount from about 0.5 to about 5 percent by weight based on the total weight of the composition.  
     
     
         22 . The composition of  claim 1 , wherein the polymeric binding agent is present in the composition in an amount from about 3 to about 30 percent by weight based on the total weight of the composition.  
     
     
         23 . The composition of  claim 1 , wherein the debonding agent is present in the composition in an amount from about 10 to about 50 percent by weight based on the total weight of the composition.  
     
     
         24 . A water-based paint composition, comprising: 
 (a) an opacifying agent comprising titanium dioxide;    (b) a viscosity enhancing agent comprising hydroxyethylcellulose;    (c) a surfactant comprising a salt derived from morpholine and a long-chain carboxylic acid;    (d) a polymeric binding agent comprising an acrylic-based latex; and    (e) a debonding agent active on metal surfaces comprising soybean oil.    
     
     
         25 . The composition of  claim 24  further comprising at least one of a preservative, a dispersing aid, a defoaming agent, and a coalescing agent.  
     
     
         26 . The composition of  claim 24 , wherein the composition exhibits no sediment formation for about at least two months when stored at about 20° C.  
     
     
         27 . The composition of  claim 24 , wherein the composition exhibits no phase separation for about at least two months when stored at about 20° C.  
     
     
         28 . The composition of  claim 24 , wherein the composition is spreadable at rate of from about 10 to about 300 g/m 2 .  
     
     
         29 . A method for labeling an oriented strandboard panel bundle, comprising: 
 (a) placing a stencil against a side of an oriented strandboard panel bundle, wherein the bundle comprises a stack of oriented strandboard panels, and each panel having an exposed edge;    (b) applying a paint composition to the exposed edges of the oriented strandboard panels by spraying the composition through the stencil; wherein the composition comprises a water-based paint composition, comprising: 
 (i) an opacifying agent;  
 (ii) a polymeric binding agent; and  
 (iii) a debonding agent active on metal surfaces; and  
   (c) removing the stencil from the unit.    
     
     
         30 . The method of  claim 29 , wherein the composition is applied at a spread rate of from about 10 to about 300 g/m 2 .  
     
     
         31 . A method for making a labeling paint composition, comprising blending an aqueous suspension comprising an opacifying agent and a polymeric binding having a glass transition temperature greater than about  25 ° C. with an emulsion comprising a debonding agent active on metal surfaces to provide a labeling paint.  
     
     
         32 . The method of  claim 31 , wherein the emulsion is prepared under high shear conditions.  
     
     
         33 . The method of  claim 31 , wherein the emulsion further comprises a viscosity enhancing agent.  
     
     
         34 . The method of  claim 31 , wherein the emulsion further comprises a surfactant.  
     
     
         35 . The method of  claim 31 , wherein the suspension further comprises a coalescing agent.