Patent ID: 7345126
Filing Date: 2008-03-18
Classification: C08F

Abstract:
1. A production method of a hydroxyl-containing polymer comprising: protecting a hydroxyl group of a hydroxyl-containing monomer with a protecting group to make the monomer a protected monomer with decreased hydrophilicity; adding the protected monomer alone or together with a hydrophobic monomer to a water-based medium containing a salt and a dispersion stabilizer; adding a polymerization initiator to the mixture to carry out suspension polymerization; and de-protecting the obtained polymer having the protecting group to recover the hydroxyl group, wherein the protected monomer is located mainly in an oil layer of the suspension polymerization system during the suspension polymerization, and wherein the hydroxyl-containing monomer is at least one monomer selected from the group consisting of hydroxyethyl (meth)acrylate, polyethylene glycol (meth)acrylate, hydroxycyclohexyl (meth)acrylate, and hydroxypropyl (meth)acrylate.