Process for preparing aqueous dispersion

Abstract

An aqueous dispersion is prepared by subjecting (meth)acrylate containing a polyfluoroalkyl group and a polymerizable monomer containing no fluorine atom to an emulsification treatment in the presence of a surfactant and a polypropyleneglycol-based compound having a molecular weight of 250 to 5,000, followed by copolymerization reaction in the presence of a polymerization initiator. The resulting aqueous dispersion, even if prepared from (meth)acrylate copolymer containing mixed perfluoroalkyl groups including perfluoroalkyl groups having 12 or more carbon atoms as polyfluoroalkyl groups, has a distinguished emulsion stability and thus can be effectively used as a water and oil repellent, etc.

1 - 10 . (canceled) 
   
   
       11 . An aqueous dispersion prepared by subjecting (meth)acrylate containing a polyfluoroalkyl group and a polymerizable monomer free of fluorine atoms to an emulsification treatment in the presence of a surfactant and a polypropyleneglycol-based compound having a molecular weight of 250 to 5,000, followed by copolymerization reaction in the presence of a polymerization initiator. 
   
   
       12 . An aqueous dispersion prepared by subjecting (meth)acrylate containing a polyfluoroalkyl group and a polymerizable monomer free of fluorine atoms to an emulsification treatment in the presence of a surfactant and a polypropyleneglycol-based compound having a molecular weight of 250 to 5,000, followed by copolymerization reaction in the presence of a polymerization initiator wherein a polymerizable monomer containing a cross-linkable group is further copolymerized. 
   
   
       13 . An aqueous dispersion according to  claim 11  provided in a water and oil repellent. 
   
   
       14 . An aqueous dispersion according to  claim 12  provided in a water and oil repellent. 
   
   
       15 . An aqueous dispersion provided in a water and oil repellent according to claim  1 , wherein the (meth)acrylate containing a polyfluoroalkyl group is present in a proportion of at least 10 wt. % on the basis of the resulting copolymer. 
   
   
       16 . An aqueous dispersion provided in a water and oil repellent according to claim  1 , wherein the (meth)acrylate containing a polyfluoroalkyl group is a (meth)acrylate containing mixed perfluoroalkyl groups including perfluoroalkyl groups having 12 of more carbon atoms. 
   
   
       17 . An aqueous dispersion provided in a water and oil repellent according to claim  1 , wherein the polymerizable monomer free of fluorine atoms comprises at least one of (meth)acrylic acid ester, dialkly ester of fumaric acid or maleic acid and vinyl ester. 
   
   
       18 . An aqueous dispersion provided in a water and oil repellent according to  claim 17 , wherein the (meth)acrylate acid ester comprises at least one of lauryl acrylate, stearyl (meth)acrylate, cyclohexyl methacrylate and benzyl methacrylate. 
   
   
       19 . An aqueous dispersion provided in a water and oil repellent according to claim  18 , wherein the (meth)acrylic acid ester comprises stearyl acrylate or stearyl acrylate in combination with cyclohexyl methacrylate or benzyl methacrylate. 
   
   
       20 . An aqueous dispersion provided in a water and oil repellent according to claim  1 , wherein the surfactant comprises at least one of a polyethylene oxide-based nonionic surfactant and a cationic surfactant. 
   
   
       21 . An aqueous dispersion provided in a water and oil repellent according to claim  1 , wherein the polypropyleneglycol-based compound comprises at least one of polypropyleneglycol, its terminal monomethyl ether and glycerin•polypropyleneglycol adduct. 
   
   
       22 . An aqueous dispersion provided in a water and oil repellent according to  claim 12 , wherein the polymerizable monomer having a cross-linkable group comprises at least one of acrylamide, its derivatives, and glycidyl (meth)acrylate.