Patent ID: 8119749
Filing Date: 2012-02-21
Classification: C08F

Abstract:
1. A method of obtaining a (meth)acrylate-based polymer from a reaction solution containing the (meth)acrylate-based polymer, said method comprising: (a) adding a carboxylic acid having a water content of 20% by mass or less to the reaction solution containing the (meth)acrylate-based polymer, wherein said (meth)acrylate-based polymer is obtained by a polymerization of a monomer composed mainly of a (meth)acrylate in a water-insoluble organic solvent in the presence of an organoaluminum compound and a polymerization initiator, wherein said polymerization initiator comprises an organic alkali metal compound, and wherein the concentration of the polymerization initiator is 1 to 10 mmol per 1 liter of polymerization solution and the amount of the organoaluminum compound is from 0.5 to 20 times, per mol, the amount of the polymerization initiator; (b) washing the reaction solution to which the carboxylic acid has been added in (a) by admixing water at a temperature of from 90° C. to 150° C., thereby forming a mixture of water and the reaction solution; (c) separating the mixture of water and the reaction solution generated in (b) into an organic solvent solution layer and an aqueous solution layer; and (d) isolating each of the organic solvent solution and the aqueous solution layers obtained in (c), and recovering the (meth)acrylate-based polymer from the organic solvent solution isolated in (d), wherein the (meth)acrylate-based polymer is a diblock copolymer composed of a methacrylate-based polymer block and an acrylate-based polymer block, or a triblock copolymer composed of a methacrylate-based polymer block, an acrylate-based polymer block and a methacrylate-based polymer block.