TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The bivalent aromatic group is chosen from 74 groups e.g. group of formula (i)-(v). The aromatic ring-containing compound is chosen from 97 aromatic ring-containing compounds e.g. aromatic ring-containing compound of formula (X)-(XIV). The hydrocarbon compound is chosen from 10 hydrocarbon compounds e.g. hydrocarbon compound of formula (XX)-(XXIV).Z'=aldehyde or amino.    TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): The polyazomethine is manufactured by copolymerizing hydrocarbon compound of formula: Y'-(Ar'-A)h-((C(-R3)H)i-(T)j-(C(-R4)H)k)n-(A-Ar')m-Y' (II), and aromatic ring-containing compound of formula: Z-(((C(-R5)H)p-(T)q-(C(-R6)H)r)s-A)y-Ar1-(A-Ar2)t-(A-((C(-R7)H)u-(T)v-(C(-R8)H)w)x)z-Z (III).Y'=aldehyde or amino;A=azomethine;Ar'=optionally substituted bivalent aromatic group;h,m=0 or 1;R3,R4=H, 1-20C alkyl, halo or carboxy;T=bivalent group having oxygen, sulfur or cycloalkylene;j,q,v,z,y=0 or 1;i,k,p,r,u,w=0-12;n,s,x=1-10;Ar1,Ar2=optionally substituted bivalent aromatic group;t=0-8;andR5-R8=H, 1-20C alkyl, halo or carboxy.(i) When T is oxygen or sulfur, both i and k are 1 or more; (ii) The carbon atom number of (-(CHR3)i-(T)j-(CHR4)k-)n is 2-42; (iii) When Y' is aldehyde, Z is amino; (iv) When Y' is amino, Z is aldehyde; (v) When T is oxygen or sulfur, p, r, u and w are 1 or more; and (vi) The carbon atom number of (-(CHR5)p-(T)q-(CHR6)r-)s and (-(CHR7)u-(T)v-(CHR8)w-)x is 2-42. Preferred Composition: The polyazomethine has repeating unit of formula: -(((C(-R1)H)a-(T)b-(C(-R2)H)c)e-A)f-((X-A)d)g- (I).R1,R2=H, 1-20C alkyl, halo or carboxy;X=optionally substituted bivalent aromatic group;b=0 or 1;a,c=0-12;d,e=1-10;andf,g=1-800.(i) When T is oxygen or sulfur, both a and c are 1 or more; and (ii) The carbon atom number of hydrocarbyl of repeating unit (I) of polyazomethine is 3-43. Preferred Properties: The polyazomethine has weight average molecular weight of 2000-2000000, and solubility of 0.1 g or more at 25 degrees C with respect to 100 g of solvent chosen from cresol, toluene, tetrahydrofuran, cyclopentyl methyl ether, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, chloroform, dichloromethane, carbon tetrachloride, chlorobenzene, carbon disulfide, ethyl acetate, butyl acetate, methyl lactate, methanol, ethanol, isopropanol, benzyl alcohol, n-butanol, t-butanol, pentanol, ethylene glycol, propylene glycol, propylene glycol monomethyl ether, pyridine, N-methyl-2-pyrrolidone, sulfuric acid, formic acid, acetic acid, hydrochloric acid, lactic acid, triethylamine and dibutylamine. EXAMPLE - Terephthal aldehyde (in g) (1.08), 1,2-bis(2-aminoethoxy)ethane (1.48) and m-cresol (20) were mixed and heated at 70 degrees C for 48 hours. The reaction mixture was vacuum-dried and washed to obtain polyazomethine (2.05), with yield of 78% and weight average molecular weight of 200000.