Deinking a cellulosic substrate using magnesium silicate

Abstract

A composition and method for deinking is disclosed. The composition and method contain an activated magnesium silicate or a magnesium silicate.

1 . A composition comprising:
 a. activated magnesium silicate;   b. optionally a suspending agent for said activated magnesium silicate;   c. water;   d. optionally an emulsifier;   e. optionally excluding caustic soda; and   f. optionally excluding hydrogen peroxide.   
     
     
         2 . The composition of  claim 1 , wherein said suspending agent is a thickening agent. 
     
     
         3 . The composition of  claim 2 , wherein said thickening agent is selected from the group consisting of: galactomannans; guar gum; locust bean gum; xanthan gum; para gum; cellulosics; hydroxypropyl methylcellulose; hydroxypropyl cellulose; carrageean; alginates; sodium alginates; potassium alginates; ammonium salt alginates; and a combination thereof. 
     
     
         4 . The composition of  claim 1 , wherein said composition contains from about 5% to about 70% of said activated magnesium silicate, based upon weight of the composition. 
     
     
         5 . The composition of  claim 1 , wherein said composition contains from about 0.05% to about 20% of said suspending agent, based upon weight of the composition. 
     
     
         6 . The composition of  claim 1  further comprising: an oil 
     
     
         7 . The composition of  claim 6  wherein said composition contains from about 2% to about 55% of said oil based upon the weight of the composition. 
     
     
         8 . The composition of  claim 1  wherein said composition contains from about 0.5% to about 20% of said emulsifier. 
     
     
         9 . The composition of  claim 6 , wherein said oil contains a fatty acid, optionally further comprising rosin, optionally wherein the content of rosin in the composition is from greater than 0% to about 30% based upon weight of the fatty acid. 
     
     
         10 . The composition of  claim 9 , wherein said oil is used to form an oil and water emulsion. 
     
     
         11 . The composition of  claim 1  wherein said emulsifier is a surfactant. 
     
     
         12 . The composition of  claim 9 , wherein said fatty acid contains a tall oil fatty acid. 
     
     
         13 . The composition of  claim 1 , wherein the emulsifier is selected from the group consisting of: sorbitol derivatives; polysorbate 80; sorbitan monolaurate; polysorbate 20; ethoxylated alcohols; sodium laureth sulfate; polyethylene glycol; sulfate esters; sodium lauryl sulfate; and a combination thereof. 
     
     
         14 . A composition comprising:
 a. activated magnesium silicate;   b. water;   c. xanthan gum;   d. tall oil fatty acid; and   e. sodium lauryl sulfate   
     
     
         15 . The composition of  claim 14  wherein the composition is comprised of about 18% of said activated magnesium silicate; about 0.288% xanthan gum; about 22% tall oil fatty acid; and about 2% sodium lauryl sulfate. 
     
     
         16 . A composition comprising:
 a. magnesium silicate;   b. a suspending agent for said magnesium silicate;   c. water;   d. optionally an emulsifier;   e. optionally excluding caustic soda; and   f. optionally excluding hydrogen peroxide.