TECHNOLOGY FOCUS - POLYMERS - Preparation (Disclosed): High molecular weight compound is manufactured by polymerizing compound having vinyl group and compound having halogen atom, or compound having vinyl group and halogen group, by Heck reaction in presence of catalyst in inert gas atmosphere, in organic solvent. Preferred Compound: The high molecular weight compound has number average molecular weight of 1x103-1x108 by polystyrene conversion. The high molecular weight compound further has another arylene-having repeating unit of formula (10): -(Ar19-(X2)p)-.Ar19=bivalent aromatic amine, bivalent heterocyclic group, arylene group or bivalent aromatic phosphino, preferably bivalent group of formulae (10a-10d);X2=-CR14=CR15- or -C?=C-;p=0 or 1;R14,R15=H, alkyl, aryl, monovalent heterocyclic group or cyano;X=atom, which forms 5- or 6-membered ring grouping with two atoms on ring (A1) and two atoms on ring (A2), or bivalent group, preferably -C(R18)(R19)-, -C(R20)(R21)-C(R22)(R23)-, -O-, -S- or -N(R24)-;Ra=substituent;m=0-5;n=0-3;R18-R23=H, alkyl, alkoxy, alkylthio, alkylsilyl, alkylamino, aryl, aryloxy, arylalkyl, arylalkoxy, arylalkenyl, arylalkynyl, arylamino, monovalent heterocyclic group or cyano group;andR24=H, alkyl, aryl, arylalkyl or monovalent heterocyclic group.Preferred Component: A light emitting layer containing high molecular weight compound is provided between anode and cathode of polymeric light-emitting element. The high molecular weight compound is combined with a solvent to obtain liquid composition. Preferred Definitions:    Ar1=bivalent group of formula (8) or (9);and    R13=H, alkyl, alkoxy, alkylthio, alkylsilyl, alkylamino, aryl, aryloxy, arylalkyl, arylalkoxy, arylalkenyl, arylalkynyl, arylamino, monovalent heterocyclic group or cyano group, and optionally combines to form aromatic or non-aromatic ring.    EXAMPLE - Bromine-containing monomer (formula (II)) (in g) (0.63), phosphorus-containing monomer (PP-TPP) (0.23) and 2,2'-bipyridyl (0.66) were added to a reaction container substituted by nitrogen gas. The container was bubbled by argon gas. Deaerated tetrahydrofuran (70) was added. Bis(1,5-cycloocta diene) nickel (O) (1.15) was added to the mixed solution. Reaction was carried out at 60degreesC for 3 hours in nitrogen gas atmosphere. The obtained reaction solution was cooled after reaction completion, washed with methanol/ion exchange water, filtered, recovered and dried. The dried reaction product was dissolved in toluene, and filtered. Insoluble material was removed, and toluene solution was washed with 1N hydrochloric acid and methanol, and dried to obtain polymer having weight average molecular weight of 1x104, number average molecular weight of 5.9x103 and glass transition temperature of 101degreesC. The obtained high molecular weight compound was used for light-emitting layer of polymeric light-emitting element. The obtained light-emitting element had high luminous efficiency and heat resistance.