TECHNOLOGY FOCUS - POLYMERS - Preferred Process: The polymer is obtained by reacting one or more compounds in presence of zero valent nickel complex catalyst. The compounds are of formulae: Y1-Ar1-Y2, Y3-Ar2-Y4, Y5-Ar3-Y6 and E1-Y7.Y1-Y6 = halogen, alkyl sulfonyloxy group and aryl sulfonyloxy group;andY7 = H.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Group: The unsaturated hydrocarbon group, which does not contain aromatic ring is cycloocta dienyl group. The unsaturated hydrocarbon group has 2 or more unsaturated bond, and is of formula: CiH2(i-j)-1.i = 5 or more, preferably 8;andj = at least0 and less than i/2, preferably 0-2.Preferred Compound: The compound (E1-Y7) is cycloocta diene. Preferred Composition: The content of cycloocta diene is 100-300 mol% with respect to sum total of monomers. EXAMPLE - 2,7-dibromo-9,9-dioctyl fluorene (in mg) (450), 2,7-dibromo-9,9-diisopentyl fluorene (130), 1,5-cycloocta diene (310) and 2,2'-bipyridyl (320) were dissolved in tetrahydrofuran (28 ml). Nitrogen was bubbled into the obtained solution. Bis (1,5-cycloocta diene) nickel(0) (Ni(COD)2) (580) was added to the resulting solution, heated at 60degreesC, and reacted for 3 hours. The obtained reaction solution was cooled to room temperature. 50 ml of mixed solution of 25% aqueous ammonia, methanol and ion exchange water, was added to the cooled solution, and stirred for 1 hour. The obtained precipitate was filtered, and dried under reduced pressure for 2 hours. The obtained product was dissolved in toluene (30 ml), and 1N hydrochloric acid (30 ml) was added, and stirred for 1 hour. The aqueous layer was removed, and aqueous ammonia (30 ml) and methanol (200 ml) were added to the organic layer, and stirred for 1 hour. The obtained precipitate was filtered, and dried under reduced pressure for 2 hours. The obtained product was dissolved in toluene (30 ml), and purified using an alumina column. Methanol (150 ml) was dripped over the recovered solution, and stirred for 1 hour. The obtained precipitate was filtered, and dried under reduced pressure for 2 hours, to obtain polymer (250). The polymer had high stability with respect to electric field reduction, number average molecular weight of 1.5x104 and weight average molecular weight of 3.2x104 based on polystyrene conversion measured by gel permeation chromatography.