TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The fluoropolymer contains repeating units (A) derived from above fluorine-containing compound, repeating unit (B) derived from monomer (b) which does not contain fluorine atom, and repeating unit (C) derived from a crosslinkable monomer (c). The fluoropolymer contains monomer (b) (0.1-50 wt.pts) and monomer (c) (20 wt.pts or less) with respect to fluorine containing compound (100 wt.pts).Preferred Compounds: The monomer (b) is acrylate monomer expressed with formula: CH2=CA1COOA2.A1=hydrogen or methyl group;A2=1-30C hydrocarbon group, particularly, alkyl group of formula (CnH2n+1); andn=1-30. Preferred Definitions:    Rf=1-6C fluoro alkyl group or perfluoro alkyl group.    EXAMPLE - 1,1,1,2,2,3,3,4,4-nonafluoro-4-iodo butane (in g) (138.4) was dissolved in mixture of dimethyl formamide (400 ml) and water (80 ml), and added with mercapto ethanol (22.2). Sodium formate (27.2) and sodium sulfite heptahydrate (100.9), were then added and stirred at room temperature. Water (1 l) and isopropyl ether (1 l) were then added. The organic layer was separated, washed, distilled to remove solvent and dried to form 2-(perfluoro butylthio) ethanol. p-toluene sulfonic acid monohydrate (2.5) was added to cyclohexane solution (500) of 2,3-dicholoro propionic acid (22.5). Dehydration-condensation reaction was carried out at 90degreesC. The organic layer was separated from the reaction liquid, washed and dried. Crude 2-(perfluoro butylthio)ethyl-2,3-dichloro propionate (63.8) was obtained by filtration and vacuum concentration with a yield of 96.5%. The obtained dichloro propionate (55) was dropped into a solution of chloroform (130), triethylamine (15.8) and 4-t-butyl catechol at 0degreesC. The mixture was solidified, added with chloroform (10) and stirred at room temperature for 30 minutes. The reaction mixture was filtered and the residue was dried after washing. The residue was subjected to vacuum distillation, and 102-104degreesC boiling fraction was recovered from which 2-(perfluoro butylthio)ethyl-2-chloro acrylate (41.6) was obtained with a yield of 82.8%. The obtained fluorine-containing monomer was found to have excellent water repellency, oil repellency and antifouling property. The fluoropolymer containing the obtained fluorine-containing monomer was used for processing textiles. The processed textile had excellent stain resistance.