TECHNOLOGY FOCUS - POLYMERS - Preferred Compound: The sulfur-sulfate monomer is of formula: H2C=CX-A-S-SO3-Z.X=H, methyl, fluorine, chlorine, bromine, iodine, CFX1X2 group, cyano, 1-20C linear or branched fluoroalkyl, (un)substituted benzyl or (un)substituted phenyl;X1,X2=H, fluorine atom or chlorine atom;A=-Ph-Y- or -COO-Y-;Ph=optionally substituted phenylene;Y=1-10C aliphatic group having direct bond and oxygen atom, 6-10C aromatic group having oxygen atom, cycloaliphatic, aroma aliphatic or -CH2CH2N(R1)SO2 group, preferably -(CH2)n;n=1-10;R1=1-4C alkyl or -CH2CH(OY1)CH2 group;Y1=H or acetyl;andZ=H or metal atom, preferably alkali metal.The fluorine-containing monomer (B) is at least one compound of formulae: CH2=C(-X1)-C(=O)-A1-Rf, and H2C=CX1-COO-Y-Rf.X1=H, fluorine, chlorine, bromine, iodine, CFX3X4 group, cyano, 1-21C linear or branched alkyl, 1-21C linear or branched fluoroalkyl, (un)substituted benzyl or (un)substituted phenyl;X3, X4=H, fluorine, chlorine, bromine or iodine;A1=-O-Y1-, or -Y2-((CH2)m-Z-)p-(CH2)n-group;Y1=1-10 aliphatic, 6-10C aromatic, cycloaliphatic, -CH2CH2N(R2)SO2-(CH2CH2)a group, -CH2CH(OR11)CH2 group, or -(CH2)nSO2 group;R2=1-4C alkyl;R11=H or acetyl;a=0 or 1;m,n=1-10;p=0 or 1;Rf=fluoroether group having 1-200 repeating units chosen from 1-21C fluoroalkyl, 1-21C fluoroalkenyl, -C3F6O-, -C2F4O-, or -CF2O-, preferably perfluoro alkyl;andY=same as defined above. EXAMPLE - R-1420 (RTM: 2-(perfluorobutyl) ethylacrylate) (9FA) (in g) (8), methyl methacrylate sodium sulfonate (MMAS) monomer (0.33) of formula: H2C=C(CH3)-COO-CH2CH2-S-SO3-Na+, 2-proponal (10), water (18.4) and azobis isobutyronitrile (4.32 mg) were heated at 60degreesC in nitrogen atmosphere for 15 hours. The reaction product was obtained filter under reduced pressure and white deposit was collected. The deposit was added to methanol and the precipitate formed was dried to obtain 67% yield of 9FA/MMAS copolymer fine particles (5.6). A surface-treating agent was produced using the 9FA/MMAS copolymer. The to-be-processed material processed by the surface-treating agent had excellent oil repellency and water repellency.