TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The ketone solvent and alcohol solvent has 6 or less carbon atoms. During manufacture of flame retardant, the copolymer is formed as insoluble precipitate in the solvent. When primary, secondary or tertiary amine (N(R14)(R16)-(R15)) is used, the copolymer is obtained in the form of amine salt, where R14-R16 are H, alkyl or aromatic group.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymer: The phosphoric acid group containing unsaturated monomer forms ammonium salt, amine salt or metal salt. The conjugated diene group liquid oligomer is of formula (2) and its hydrogenated product is of formula (3). Conjugated diene group liquid oligomer, its hydrogenated product and vinyl aromatic-conjugated diene copolymerized group liquid oligomer is copolymerized with unsaturated compound (c) having acid group and/or unsaturated compound (d) not having acid group. The acid group of compound (c) is chosen from phosphoric acid, phosphonic acid, sulfonic acid, carboxylic acid and/or alcoholic hydroxyl group. Compound (d) does not have acid group and is chosen from (meth)acrylonitrile, (meth)acrylamide, (meth)acrylic acid ester, amino-group-containing unsaturated monomer, (un)substituted styrene, halogenated vinyl, fatty-acid vinyl ester and/or fluorine group-containing unsaturated monomer. Unsaturated compound (c) or unsaturated monomer (d) is a cross-linking agent. The cross-linking agent is urethane acrylate of formula (4).R3,R4=H, hydrocarbon group having one or more ethylenically unsaturated bond and functional group, or hydrocarbon group not having ethylenically unsaturated bond and optionally having functional group, and at least one of R3 and R4 is hydrocarbon group having one or more ethylenically unsaturated bond;R5-R10=H or methyl group and at least one of R5,R6 is H;m=polymerization degree;andR11=alkylene group. Preferred Definitions:    R1=H or methyl group;    R2=tetramethylene group;and    n=1.    EXAMPLE - Acid phosphoxy butyl acrylate (in mass parts) (8.7), triethyl amine salt of acid phosphoxy butyl acrylate (41.9), terminal acrylic modified liquid butadiene oligomer (23.4), acrylonitrile (22.1), tetrafunctional urethane (3.9) and photoinitiator (3.9) were mixed and copolymerized to form conductive polymer. The obtained polymer was interposed between fluorine resin film and glass flat plate. A laminate having excellent water resistance, methanol proof property, hot water resistance, surface specific resistance of 8.46x108 at 25degreesC and proton electric conductivity of 2.8x10-2 S/cm at 35degreesC and 90% relative humidity was obtained.