Patent ID: 7973117

Claim:
A process for continuously producing a (meth)acrylic ester polymer or copolymer by anionic polymerization, comprising: connecting two or more reactors, continuously feeding an organoaluminum compound-containing polymerization initiator solution and at least one kind of methacrylic ester or acrylic ester into a first reactor to continuously obtain a polymerization reaction liquid containing the organoaluminum compound and living polymers of the methacrylic ester and/or acrylic ester, and subsequently continuously feeding the polymerization reaction liquid and at least one kind of methacrylic ester or acrylic ester that is the same as or different from the methacrylic ester or acrylic ester fed into the first reactor into the (n+1)th reactor (n represents a natural number) to continuously obtain a polymerization reaction liquid containing the organoaluminum compound and living polymers of methacrylic ester and/or acrylic ester; controlling, in at least one of the reactors, the ratio of molar quantity of methacrylic ester or acrylic ester to ([molar quantity of organoaluminum compound]−[molar quantity of polymerization initiator]) in the reactor, i.e. {[molar quantity of methacrylic ester or acrylic ester]/([molar quantity of organoaluminum compound]−[molar quantity of polymerization initiator])}, to be 15 to 80; and controlling the content of methacrylic ester or acrylic ester in the total feed amount of the polymerization initiator solution or the polymerization reaction liquid and the methacrylic ester or acrylic ester fed into the reactor to be 5% by mass or lower.