The stable concentrated emulsions of methyl methacrylate—butyl acrylate(MMA—BA)are prepared using sodium dodecyl sulfate(SDS)and cetly alcohol(CA)as the compound surfactants

polyvinyl alcohol(PVA)as the reinforcer of liquid films．A novel method of polymerization

the thin layer copolymedzation of the concentrated emulsion

was carried out with benzoyl peroxide／N

N'-dimethyl aniline(BPO／DMA)as redox initiators at low temperature．Effects of categories of the reinforcer of liquid films and the polymerization environment on polymerization stability were introduced．The effect of the thickness and area of films

the outside temperature

and environment of polymerization on the amount of volatilization were investigated．The conversion comparison of the thin layer polymerization with the tube polymerization and the effect of polymerization environment on the polymerization rate were discussed also．The size and distribution of particle diameter and morphology of latex particles were determined with TEM.