TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The isocyanate compound (II) is of formula: O=C=N-(CjH2j+1-k)-(CH=)k. The carbonyl group-containing compound is of formula: Xb-C(=O)-(CH2)j-CH=CH2. The organic group-containing compound (IV) is of formula: Xc-(CH2)j-CH=CH2.j=1-20;k=1-10;and2j+1-k=0 or more.Preferred Property: The cured material has light transmittance of 80% or more.    TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): A fluorine-containing monomer and vinyl-ester monomer are copolymerized and obtained fluorine-containing monomer/vinyl-ester copolymer is hydrolyzed. The obtained fluorine-containing monomer/vinyl alcohol copolymer and isocyanate compound of formula: O=C=N-Rb (II) are reacted, to obtain fluorine-containing polymer. Preferred Process: Alternatively, the fluorine containing polymer is obtained by copolymerizing fluorine-containing monomer and vinyl-ester monomer, hydrolyzing obtained fluorine-containing monomer/vinyl-ester copolymer, reacting obtained fluorine-containing monomer/vinyl alcohol copolymer with carbonyl group-containing compound of formula: Xb-C(=O)-Rb (III) or organic group-containing compound of formula: Xc-Rb (IV), or copolymerizing fluorine-containing monomer and vinyl-ester monomer of formula: CH2=CH-OR (V), deprotecting obtained fluorine-containing monomer/vinyl-ester copolymer, reacting obtained fluorine-containing monomer/vinyl alcohol copolymer with isocyanate compound (II), carbonyl group-containing compound (III) or organic group-containing compound (IV).Xb=HO-, R10O-, F- or Cl-;R10=alkyl or fluorine-containing alkyl;Xc=cl, Br or I;andR=protecting group which is converted into vinyl alcohol by deprotection.Preferred Composition: The molar ratio of polymer unit (A), polymer unit (B) and polymer unit (C) is 30-70/0-69/1-70. Preferred Definitions:    L=single bond.    EXAMPLE - 2.2 g Tetrafluoroethylene/vinyl alcohol/acetic acid vinyl polymer was dissolved in 20 g N,N-dimethylformamide solution. 73 mu L Dibutyltin dilaurate as catalyst and 1.50 g aryl isocyanate were added into resultant mixture and reacted at room temperature for 24 hours. Butyl acetate and deionized water were added into the obtained reaction liquid and extracted. The obtained polymer was washed using water, organic layer was separated and dried with anhydrous magnesium sulfate. The obtained product was dissolved in acetone, solid was precipitated using n-hexane and purified, to obtain 3.2 g polymer with yield of 88%.