TECHNOLOGY FOCUS - POLYMERS - Preparation: No preparation method is given. Preferred Components: The polymer particles contain surface and/or non-surface ionogen groups. The polymer particles are rubber or non-rubber particles. The rubber polymer articles are conjugated diene preferably butadiene, isoprene, 2-chlorbutadiene or 2,3-dichlorobutadiene, ether, ester of acryl- and methacrylic acid, vinylacetate, styrene or their derivatives, acrylonitrile, acrylamide, methacrylamide, tetrafluoroethylene, vinylidenefluoride, hexafluoropropene, double bond containing hydroxy compounds preferably hydroxyethylmethacrylate, hydroxyethylacrylate, hydroxypropylacrylate or hydroxybutylmethacrylate. (I) has a glass transition temperature (Tg) of -100 to 150 degrees C. (I) is methacrylate, particularly methylmethacrylate, styrene or its derivatives of alpha-methylstyrene or para-methylstyrene, acrylonitrile, methacrylonitrile and/or vinylcarbazole. (I) are at least partially cross-linked by the addition of polyfunctional monomers in the polymerization process. The polyfunctional monomers are at least two, preferably 2-4 copolymerizable carbon carbon double bonded compounds, preferably diisopropenylbenzene, divinylbenzene, divinylether, divinylsulfone, diallylphthalate, triallyl cyanogenurate, triallylisocyanogenurate, 1,2-polybutadiene, N,N'-m-phenylenemaleimide, 2,4-toluylenebis (maleimide), triallyltrimellitate, acrylates and methacrylate, preferably 2-4-valent, 2-10 carbon alcohols, preferably ethyl glycol, propanediol, 1,2-butanediol, hexanediol, polyethylene glycol with 2-20, preferably 2-8 oxyethylene units, neopentylglycol, bisphenol A, glycerin, trimethylolpropane, pentaerythritol, sorbitol, unsaturated polyesters of aliphatic di- and poly-ol and/or maleic acid, fumaric acid, and/or itaconic acid; acrylic acid, methacrylic acid, vinylbenzoic acid, crotonic acid, vinylsulfonic acid, styrene sulfonic acid, phosphonic acid groups containing monomers with polymerizable carbon carbon double bond, preferably vinylphosphonic acid, 2-phosphonomethyl-acrylic acid and 2-phosphonomethyl acrylic acid amide, phosphoric acid or phosphonic acid ester of hydroxyfunctional, polymerizable carbon carbon double bond containing monomers or their salts or derivatives. (I) exhibits: spherical geometry; an average particle diameter of less than 350 nm; width of the glass transient area of larger than 5 degrees C; and exhibits less than 80 swelling index in toluene at 23 degrees C. (I) is at least 70% insoluble in toluene at 23 degrees C. The derivatives of (I) are esters. The phosphoric acid esters of hydroxyfunctional polymerizable carbon carbon double bond containing monomers have the structure of formula (CH2=C(CH3)-C(=O)-O-R-O-P(=O)(OH)-OH) or (CH2=C(CH3)-C(=O)-O-R-O-P(=O)(OH)-O-R-O-C(=O)-C(CH3)=CH2).R = a bivalent organic group, preferably 1-10C-alkylene.Preferred Process: The ionogen groups are polymerized into functional monomers; and/or the monomers are modified to give (I). The ionogen groups - OSO3H or -OP(O)(OH)2 are obtained by: reaction of hydroxyl-modified polymer particles with sulfuric acid or phosphoric acid; or addition of sulfuric acid or phosphoric acid to double bond containing polymer particles; or decomposition of persulfate or perphosphate in the presence of double bond containing polymer particles; or transesterification of polymer particles using sulfur or phosphoric acid. The ionogen groups -SO3H or - P(O)(OH)2 are obtained by sulfonation and/or phosphonation of aromatic vinylpolymer. EXAMPLE - Styrene (88.5 parts by weight), trimethylolpropanetrimethacrylate (1.5 parts by weight), sodiumvinylsulfonate (10 parts by weight), Mersolat (RTM: Sodium alkane sulfonate) (0.7 parts by weight) and water (400 parts by weight) were emulsion polymerized to give the microgel of polymer particles.