Title:
PRODUCTION OF POLYMER PARTICLE UNIFORM IN SIZE
Document Type and Number:
Japanese Patent JP3130437
Kind Code:
B2
Abstract:
PURPOSE: To produce polymer particles uniform in size without the necessity for removal of an organic solvent by adding an ethylene monomer to an aqueous medium to give an emulsion and adding seed particles uniform in size thereto to effect seed polymerization in the presence of a surfactant.
CONSTITUTION: An ethylene monomer having a polymerization initiator dissolved therein is added to an aqueous medium in an amount 0.8-to 3-fold by weight to finely disperse the monomer in the medium in the presence of a surfactant in an amount one to six times the critical micelle concentration, thus producing an emulsion. This emulsion is mixed with polymeric seed particles uniform in size by agitation to allow the particles to absorb the monomer to thereby give grown particles, and the monomer is polymerized within the particles, thus giving polymer particles having a uniform size desired. It is desirable to polymerize the monomer in the presence of a polymerization initiator dissolved therein. Since neither a hydrophobic swelling aid nor a water-soluble organic solvent is used, there is no necessity for removing them afterwards so that polymer particles uniform in size can be easily obtained.
Inventors:
Akiyoshi Kusaka
Application Number:
JP33405094A
Publication Date:
January 31, 2001
Filing Date:
December 16, 1994
Export Citation:
Assignee:
Sekisui Plastics Co., Ltd.
International Classes:
C08F2/18; C08F257/00; C08F257/02; (IPC1-7): C08F2/18
Attorney, Agent or Firm:
Masami Sakai