Narrow size distributed soap-free P(MMA-EA-MAA) latex particles with different crosslinking degree were synthesized by seeded emulsion polymerization of methyl methacrylate (MMA)

ethyl acrylate (EA) and methacrylic acid (MAA)

and voids and muhihollow latex particles were obtained after undergoing alkali treatment．Influences of kind and amount of crosslinking agents on the polymerization

particle properties and particle morphology were investigated．Results showed that the monomer conversion increased slightly in the presence of the crosslinking agents The size of particles decreased slowh as the amount of cmsslinking agent increased．and the size distribution of the particles broadened at a higher amount of cmsslinking agent Divinyl benzene (DVB) was more effective than ethyl glycol dimethyl methacrylate (EGDMA) to make polymer crosslinked．During alkali treatment process

void latex particles can be obtained when no DVB or less than 0.5 wt％ of EGDMA was used

while muhihollow structure was generated when DVB or more than 1.0 wt％ of EGDMA was introduced．The volume expansion of the particles decreased with increasing the amount of emsslinkirlg agents．