An opacifying pigment encapsulated in polymer including a pigment particle having an average particle diameter of from 0.005 to 5 microns and an index of refraction of at least 1.8; an aminophosphorus acid-functional first polymer having been used to disperse the pigment particle in an aqueous mediu
An opacifying pigment encapsulated in polymer including a pigment particle having an average particle diameter of from 0.005 to 5 microns and an index of refraction of at least 1.8; an aminophosphorus acid-functional first polymer having been used to disperse the pigment particle in an aqueous medium; and a second polymer that at least partially encapsulates the dispersed pigment particle is provided. A process for forming the opacifying pigment encapsulated in polymer and compositions including the particles are also provided.
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1. A process for forming an opacifying pigment encapsulated in polymer comprising: (a) dispersing a pigment particle having an average particle diameter of from 0.005 to 5 microns and an index of refraction of at least 1.8 in an aqueous medium with an aminophosphorus acid-functional water soluble fi
1. A process for forming an opacifying pigment encapsulated in polymer comprising: (a) dispersing a pigment particle having an average particle diameter of from 0.005 to 5 microns and an index of refraction of at least 1.8 in an aqueous medium with an aminophosphorus acid-functional water soluble first polymer formed by the addition polymerization of ethylenically unsaturated monomers selected from the group consisting of: styrene, butadiene, alpha-methyl styrene, vinyl toluene, vinyl naphthalene, ethylene, propylene, vinyl acetate, vinyl versatate, vinyl chloride, vinylidene chloride, acrylonitrile, methacrylonitrile, (meth)acrylamide, C1-C40 alkyl esters of (meth)acrylic acid, isobornyl (meth)acrylate, benzyl (meth)acrylate, phenyl (meth)acrylate, 2-bromoethyl (meth)acrylate, 2-phenylethyl (meth)acrylate, 1-naphthyl (meth)acrylate, ethoxyethyl (meth)acrylate, mono-, di-, and trialkyl esters of ethylenically unsaturated di- and tricarboxylic acids and anhydrides, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, sulfoethyl (meth)acrylate, 2-(meth)acrylamido-2-methyl propanesulfonic acid, (meth)acrylic acid, itaconic acid, fumaric acid, maleic acid, dimethylamino ethyl(meth)acrylate, dimethylamino propyl(meth)acrylamide, t-butylamino ethyl(meth)acrylate, phosphoethyl (meth)acrylate, phosphated polypropyleneoxide(meth)acrylates, phosphated polyethyleneoxide(meth)acrylates, vinyl phosphonic acid, and(b) performing an emulsion polymerization in an aqueous medium comprising one or more surfactants selected from the group consisting of anionic surfactants and nonionic surfactants, using an initiator and optional reducing component at a level of from 0.001 to 5% each based on the weight of monomer in the presence of said dispersed pigment particle to provide a second polymer that at least partially encapsulates said dispersed pigment particle. 2. The process of claim 1 in which said pigment particle comprises titanium dioxide. 3. The process of claim 1 in which said aminophosphorus acid-functional water soluble polymer is selected from the group consisting of a block copolymer having a single block comprising amine and phosphorous acid groups and a comb graft polymer having a backbone comprising amine and phosphorus acid groups with teeth which do not comprise amine and phosphorus acid groups.
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이 특허에 인용된 특허 (10)
Rosano, William Joseph; Larson, Gary Robert; Procopio, Leo Joseph; Dager, Albert Mulligan; Greenblatt, Gary David, Aqueous composite particle composition.
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Xue, Zhijian; Wiese, Harm, Method for producing an aqueous dispersion of particles that are made up of polymers and inorganic solid matter which consists of fine particles.
Hoy Kenneth L. (Kanawha WV) Glancy Charles W. (South Charleston WV) Lewis Jeffrey M. O. (Charleston WV), Micro composite systems and processes for making same.
Emmons William David (Huntingdon Valley PA) Vogel Martin (Jenkintown PA) Kostansek Edward C. (Buckingham PA) Thibeault Jack C. (Doylestown PA) Sperry Peter R. (Doylestown PA) Chung Chao-Jen (North Wa, Process for preparing an aqueous dispersion.
Emmons William David ; Vogel Martin ; Kostansek Edward C. ; Thibeault Jack C. ; Sperry Peter R., Process for preparing an aqueous dispersion of composite particles including polymeric latex adsorbed to titanium dioxide.
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