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AssigneeMitsubishi Chemical BASF Company Limited
InventorsMitsushi Murata, Tsunenori Takahashi, Yukio Kato
Estimating the term…
A suspending agent-containing slurry is disclosed which comprises a dispersant and a particulate suspending agent having a particle size distribution in which the particle diameter at weight-cumulative 95%, from the minimum particle size, is 1 μm or smaller. A method for efficiently producing the suspending agent-containing slurry is also disclosed. A process for suspension polymerization by use of the suspending agent-containing slurry is further disclosed. The slurry not only has such an excellent suspending ability in suspension polymerization that it enables the production of vinyl polymer beads having a narrow bead size distribution, but also is capable of retaining this ability over long and of exhibiting the same ability even when it has a high concentration. The suspension polymerization process enables vinyl polymer beads having a narrow bead size distribution to be produced efficiently due to the use of the slurry.
A process for suspension polymerization which comprises suspension-polymerizing a vinyl monomer in an aqueous medium containing an initiator, a suspending agent and an anionic surfactant, said suspending agent being one supplied by using a suspending agent-containing slurry in an amount of from 0.01 to 10 parts by weight on a solid basis in terms of the amount of the particulate inorganic suspending agent contained therein per 100 parts by weight of said monomer, said suspending agent-containing slurry comprising a particulate inorganic suspending agent, a dispersant and an aqueous medium, said inorganic suspending agent having a particle size distribution in which the particle diameter at weight-cumulative 95%, from the minimum particle size, is 1 μm or smaller.
Dependencies are inferred from the claim text.