A catalyst composition comprising: (a) at least 30 percent by weight of a catalyst compound based on the total weight of solids in the catalyst composition; and (b) a polymer prepared from ethylenically unsaturated monomers, wherein: (i) the polymer has a backbone derived from substantially hydrophilic monomers and/or monomers containing groups that may be rendered substantially hydrophilic after polymerization, and a plurality of side chains along the backbone derived from substantially hydrophobic monomers, or (ii) the polymer has a backbone derived from substantially hydrophobic monomers and a plurality of side chains along the backbone derived from substantially hydrophilic monomers and/or monomers containing groups that may be rendered substantially hydrophilic after polymerization; wherein the substantially hydrophilic monomers are selected from one or more of methoxypolyethylene glycol (meth)acrylate, (meth)acrylic acid, crotonic acid, itaconic acid, maleic acid and fumaric acid, hydroxyl functional ethylenically unsaturated monomers, amine functional ethylenically unsaturated monomers and protonated (cationic) derivatives thereof; the monomers containing groups that may be rendered substantially hydrophilic after polymerization are selected from epoxy functional ethylenically unsaturated monomers; the substantially hydrophobic monomers are selected from one or more of n-butyl (meth)acrylate, isobutyl (meth)acrylate, lauryl (meth)acrylate, 2-ethylhexyl (meth) acrylate, stearyl (meth) acrylate, and styrene; and wherein the catalyst compound is contained within or encapsulated by the polymer; the catalyst compound comprises an organo-metal catalyst compound and the polymer (b) demonstrates a glass transition temperature less than 15°C, the T g being the extrapolated endpoint glass transition temperature (T gE E) as defined in standard DIN 53765 using a dried sample of the resin, determined by differential scanning calorimetry at a heating rate of 10° C/ minute from -90 to 175° C. (a) at least 30 percent by weight of a catalyst compound based on the total weight of solids in the catalyst composition; and (b) a polymer prepared from ethylenically unsaturated monomers, wherein: (i) the polymer has a backbone derived from substantially hydrophilic monomers and/or monomers containing groups that may be rendered substantially hydrophilic after polymerization, and a plurality of side chains along the backbone derived from substantially hydrophobic monomers, or (ii) the polymer has a backbone derived from substantially hydrophobic monomers and a plurality of side chains along the backbone derived from substantially hydrophilic monomers and/or monomers containing groups that may be rendered substantially hydrophilic after polymerization; wherein the substantially hydrophilic monomers are selected from one or more of methoxypolyethylene glycol (meth)acrylate, (meth)acrylic acid, crotonic acid, itaconic acid, maleic acid and fumaric acid, hydroxyl functional ethylenically unsaturated monomers, amine functional ethylenically unsaturated monomers and protonated (cationic) derivatives thereof; the monomers containing groups that may be rendered substantially hydrophilic after polymerization are selected from epoxy functional ethylenically unsaturated monomers; the substantially hydrophobic monomers are selected from one or more of n-butyl (meth)acrylate, isobutyl (meth)acrylate, lauryl (meth)acrylate, 2-ethylhexyl (meth) acrylate, stearyl (meth) acrylate, and styrene; (i) the polymer has a backbone derived from substantially hydrophilic monomers and/or monomers containing groups that may be rendered substantially hydrophilic after polymerization, and a plurality of side chains along the backbone derived from substantially hydrophobic monomers, or (ii) the polymer has a backbone derived from substantially hydrophobic monomers and a plurality of side chains along the backbone derived from substantially hydrophilic monomers and/or monomers containing groups that may be rendered substantially hydrophilic after polymerization; wherein