I．Emulsion Copolymerization of isobutyl methacrytate (IBMA) with hydrophilie methaerylate esters，such as β-hydroxypropyl methacrylate(HPMA)or β-hydroxyethyl mcthaerylate (HEMA) in the presence of 2％ concentration of polyethylene oxide as nonionic emulsifiers has been investigated．Emulsions with particle size of 0.05—0.07μ have been prepared with good storage stability of more than 10 months without show-ing any coagulation．They were suitable for the preparation of barrier fihning materials of color picture tube in aluminized screens teehniques．The fihns without any ad-ditives show very good back-out properties，and are soluble in the common organic solvents such as ethyl acetate，butyl acetate，etc．II．The thermal stabilities of PHPMA．PHEMA．and various copolymers of IBMA．HPMA and IBMA-HEMA up to 450℃ have been studied by TG-DTA．It iS apparent that both PHPMA and PHEMA are thermal degradiable type polymers．It was shown from the thermal degradation studies of P(IBMA-HEMA) and P(IBMA-HPMA) copolymers that the appropriate content of HEMA or HPMA in the copolymers quali-fled for tile temporary organic barrier films in the aluminized screens techniques should not exceed 20％．