Organic polymeric particles, paper coating compositions, and methods

Abstract

Embodiments of the present disclosure include organic polymeric particles, paper coating compositions, coated paper, and methods of forming coated paper with the paper coating compositions. The embodiments of the organic polymeric particle include an organic hydrophilic polymer with a unit for hydrogen bonding, and a hollow porous structure that comprises an organic polymer that at least partially surrounds the organic hydrophilic polymer, where the hollow porous structure has a pore surface area greater than 1 percent of a total theoretical exterior surface area of the hollow porous structure and the organic hydrophilic polymer and the hollow porous structure give the organic polymeric particle a void volume fraction of 40 percent to 85 percent.

1 . An organic polymeric particle comprising:
 an organic hydrophilic polymer with a unit for hydrogen bonding; and   a hollow porous structure that comprises an organic polymer that at least partially surrounds the organic hydrophilic polymer, where the hollow porous structure has a pore surface area greater than 1 percent of a total theoretical exterior surface area of the hollow porous structure and the organic hydrophilic polymer and the hollow porous structure give the organic polymeric particle a void volume fraction of 40 percent to 85 percent.   
     
     
         2 . The organic polymeric particle of  claim 1 , where the organic hydrophilic polymer is formed from 5 to 95 weight parts of a first monomer containing an acid group, a latent acid group, or a combination thereof. 
     
     
         3 . The organic polymeric particle of  claim 1 , where the organic polymer of the hollow porous structure is formed from 1 to 25 weight parts of a second monomer containing an acid group, a latent acid group, or a combination thereof. 
     
     
         4 . The organic polymeric particle of  claim 2 , where the acid group, the latent acid group, or the combination thereof forms a carboxylic acid group upon hydrolysis. 
     
     
         5 . The organic polymeric particle of  claim 1 , where the organic hydrophilic polymer is formed from 5 to 45 weight parts of a first monomer, where the first monomer includes an acid group, and the organic polymer of the hollow porous structure is formed from 1 to 25 weight parts of a second monomer having an acid group. 
     
     
         6 . The organic polymeric particle of  claim 1 , where the organic polymer of the hollow porous structure has a glass transition temperature (Tg) that is greater than the glass transition temperature (Tg) of the organic hydrophilic polymer. 
     
     
         7 . The organic polymeric particle of  claim 1 , where the organic polymer of the hollow porous structure is formed from 2 to 30 weight parts of an acrylate monomer and 70 to 98 weight parts of a monomer selected from the group consisting of styrene, methyl methacrylate, and acrylonitrile. 
     
     
         8 . The organic polymeric particle of  claim 1 , where the organic hydrophilic polymer is formed from 5 to 99 weight parts of a monomer with a latent acid group and 1 to 95 weight parts of a monomer with an acid group, where the latent acid group is selected from the group consisting of esters and nitriles. 
     
     
         9 . The organic polymeric particle of  claim 1 , where the organic polymer of the hollow porous structure defines pores that account for 2 to 50 percent of an outer surface area of the hollow porous structure. 
     
     
         10 . The organic polymeric particle of  claim 1 , where the organic polymer of the hollow porous structure is selected from the group consisting of styrene, methyl methacrylate, and acrylonitrile. 
     
     
         11 . The organic polymeric particle of  claim 1 , where the porous structure of the expanded core and the hollow porous structure gives the organic polymeric particle a void volume fraction of 60 to 80 percent. 
     
     
         12 . The organic polymeric particle of  claim 1 , where the unit for hydrogen bonding is selected from an ester, a carboxylic acid, a nitrile, and an alcohol. 
     
     
         13 . A method of forming an organic polymeric particle comprising:
 forming a core of an organic hydrophilic polymer with monomers that contains an acid group, a latent acid group, or a combination thereof;   forming a shell that comprises an organic polymer with monomers that contains an acid group, a latent acid group, or a combination thereof to encapsulate the core, where the shell has an initial size;   expanding the core to form a hollow porous structure from the shell, where the hollow porous structure has an expanded size larger than an initial size of the shell; and   hydrolyzing the acid group, the latent acid group or the combination thereof of the hollow porous structure and the organic hydrophilic polymer to give the organic polymeric particle a void volume fraction of 40 percent to 85 percent.   
     
     
         14 . The method of  claim 13 , where hydrolyzing the acid groups, latent acid groups or the combination thereof of the hollow porous structure forms pores in the hollow porous structure. 
     
     
         15 . The method of  claim 14 , including adjusting a size of the pores in the hollow porous structure by adjusting an amount of the acid group, the latent acid group, or the combination thereof used in forming the organic polymer of the shell. 
     
     
         16 . The method of  claim 13 , including adjusting the organic polymeric particle void volume fraction by adjusting an amount of the organic hydrophilic polymer used to form the core. 
     
     
         17 . The method of  claim 13 , including crosslinking the organic hydrophilic polymer of the core. 
     
     
         18 . The method of  claim 13 , where forming the shell includes forming the shell from 5 to 10 weight parts of an acrylate monomer and 95 to 90 weight parts of a styrene monomer. 
     
     
         19 . The method of  claim 13 , where forming the core includes forming the core from 5 to 95 weight parts of monomers that contain an acid group, a latent acid group, or a combination thereof.