TECHNOLOGY FOCUS - POLYMERS - Preferred Property: The resin composition has a glass transition temperature of greater than or equal to200degreesC, and a weight-average molecular weight of 10000-300000. Preferred Composition: The content of the structure (1) is 20-100 wt.%, relative to the total weight of the resin composition. Preferred Component: The resin composition is polycarbonate, polyester, polyarylate, polyester carbonate, polysulfone, polyurethane, polyamide, polyimide, or polyamidimide. The resin composition contains a polymer comprising a repeating structural unit of structure (2) or (2'). The polymer can be of structure -(B-A)- (10).R5, R6= substituent (preferably halo, aliphatic group having 1-10C, aromatic group having 6-20C, alkoxyl group having 1-10C, or acylamino group having 1-10C);L1, L2=a single bond (preferably) or a divalent bridging group;j, k=0-3;A=divalent groups of structures (3-9);B=divalent organic group.When j and/or k is greater than or equal to2, R5 and/or R6 may be the same or different, and R5 or R6 may bond to each other to form a 5- to 7-membered ring. L1 and R5 and/or L2 and R6 may bond to each other to form a 5- to 7-membered ring, and A represents at least one kind of group from divalent bridging groups of structures (3)-(9). The molar percentage q of the (10) relative to the total number of the repeating units of (2) and the structure (10) satisfies the equation of q=greater than 0 to 50 mol.%.T=divalent organic group;Y=tetravalent organic group;R7= hydrogen atom or a substituent.Two of R7 may bond to each other to form a ring. Preferred Definitions:    R1-R4=H;    m, n=0 or 1    EXAMPLE - A solution obtained by dissolving 0.2 g sodium hydrosulfite and 17.8 g sodium hydroxide in 200 ml water was added to a solution obtained by dissolving 18.58 g compound of structure (M-101) and 52.7 mg t-butylphenol in 225 ml methylene chloride and stirred. A solution of 6.92 g triphosgene in 25 ml methylene chloride was added over 30 minutes. The reaction was allowed for further 1 hour, and 0.2 ml triethylamine was added to the mixture. After 4 hours, the organic layer was separated by phase separation and washed twice with 300 ml diluted hydrochloric acid, and methylene chloride was evaporated under reduced pressure. In a volume of 80 ml methylene chloride was added to the residue for dissolution, the dusts were removed, and the solution was filtered and then slowly poured into 400 ml methanol. The precipitated resin was washed with methanol and dried to obtain 13.7 g of a resin as white solid having a weight average molecular weight of 92000 and Tg of 212degreesC. The transparent film had a film thickness of 100 and haze of 0.5%.