초록 ▼

There is disclosed a process of dispersion-polymerizing vinyl monomers promoted by free-radical catalysts. This process comprises dispersing under stirring in water a block copolymer of the A-B type wherein A represents a lipophilic block and B a hydrophilic block, adding one or more vinyl monomers

There is disclosed a process of dispersion-polymerizing vinyl monomers promoted by free-radical catalysts. This process comprises dispersing under stirring in water a block copolymer of the A-B type wherein A represents a lipophilic block and B a hydrophilic block, adding one or more vinyl monomers containing the promoter and heating the mixture with stirring to the desired temperature. This process enables beads or balls of the desired polymer to be obtained having very regular size distribution.

대표청구항 ▼

A process for the free-radical polymerization of vinyl monomers, suspended in water, comprising the steps of: dispersing a block copolymer of the A-B type selected from the group consisting of: polystyrene-quaternized poly(vinyl-2-pyridine), polystyrene-quaternized poly(vinyl-3-pyridine), polystyren

A process for the free-radical polymerization of vinyl monomers, suspended in water, comprising the steps of: dispersing a block copolymer of the A-B type selected from the group consisting of: polystyrene-quaternized poly(vinyl-2-pyridine), polystyrene-quaternized poly(vinyl-3-pyridine), polystyrene-quaternized poly(methyl-2 vinyl-5 pyridine), polystyrene-anhydrated and hydrolyzed or salified polyisoprene, polystyrene-quaternized amidated polyisoprene, polystyrene-poly(dimethylaminoethyl methacrylate) polystyrene-quaternized poly(dimethylaminoethylmethacrylate), polystyrene-hydrolyzed and/or salified poly(trimethylsilyl methacrylate), polyisoprene-quaternized poly(vinyl-2-pyridine), polyisoprene-quaternized poly(vinyl-4-pyridine), poly(hexyl methacrylate)-poly(dimethylaminoethyl)methacrylate, poly(heptyl methacrylate)-poly(dimethylaminoethyl methacrylate), polydimethylsiloxane-quaternized poly(vinyl-2-pyridine), polydimethylsiloxane-quaternized poly(vinyl-4-pyridine), polydimethylsiloxane-poly(dimethylaminoethyl methacrylate), polydimethylsiloxane anhydrated, and hydrolyzed or hydrolysed and salified anhydrated polyisoprene, poly(vinyl chloride), hydrolyzed or hydrolysed and salified poly(vinyl acetate), polystyrene-polyacrylamide, polystyrene-polymethacrylamide, polystyrene-poly(acrylic acid) salified or not, polystyrene-polyvinylpyrrolidone, polystyrene-poly(styrene sulfonic acid), wherein A represents a lipophilic polymer block and B represents blocks A and B of said block copolymer are present in a respective molecular weight ratio of about 0.1 to 10; adding at least one vinyl monomer to be polymerized and containing a polymerization promoter to said dispersion, wherein the amount of block copolymer ranges from 0.05-5.0 parts by weight per thousand parts by weight of vinyl monomer; and heating the mixture with stirring to the desired polymerization temperature.