With itaconic acid (IA) and 1,4  butanediol (BDO) as the raw materials, the resultant hydroxyl terminated aliphatic unsaturated polyesters (PBI) were prepared. The unsaturated polyurethane was prepared with PBI as the soft segment and toluene diisocynate (T DI) as the hard segment. The effect of its reaction conditions on the mechanical properties of the unsaturated polyurethane was also investigated. It was found that the film products with the optimum properties were obtained under the material mass ratio o f TDI and PBI 1 ∶ 1.5, the reaction temperature 80 ℃ , optimum reaction time 2 h, with dibutyltin dilaurate in an amount of 1% as the catalyst. Combining with benzoyl peroxide in an amount of 1%,as an initiator, the film of the unsaturated polyurethane was smooth, transparent and level. The hardness was 6H, and the adhesion property was A grade.

2methylidenebutanedioyl dichloride(Itaconyl chloride) was synthesized using itaconic acid and phosphorus pentachloride as raw materials by melting method. The effect of raw material ratio, reaction time, temperature and other process conditions on yield of product was examined. The structure of the product was characterized by IR and 1HNMR .The experiments showed that, when the itaconyl chloride and phosphorus pentachloride molar ratio was 1∶2.2, reaction temperature was 110 ℃ and reaction time was 2 h, the yield of 2methylidenebutanedioyl dichloride can reach 86% and its purity was more than 94%.