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(1) A methacrylic ester or an acrylic ester is anionically polymerized, using a polymerization initiator compound comprising an addition reaction product of a conjugated diene compound and an organic alkali metal compound, in the presence of a tertiary organoaluminum compound having in the molecule

(1) A methacrylic ester or an acrylic ester is anionically polymerized, using a polymerization initiator compound comprising an addition reaction product of a conjugated diene compound and an organic alkali metal compound, in the presence of a tertiary organoaluminum compound having in the molecule thereof a chemical structure represented by a formula: Al—O—Ar wherein Ar represents an aromatic ring; or (2) a methacrylic ester or an acrylic ester is anionically polymerized, using a polymerization initiator compound comprising an addition reaction product of an organic alkali metal compound and a compound having a 1,1-diaryl-1-alkene structure, by adding the ester in the form of a mixture with the above-mentioned specific tertiary organoaluminum compound to the polymerization system. In this way, various species of the esters can be anionically polymerized with a high initiation efficiency and a high living polymerization property in a solvent which can easily be recovered and reused under a mild cooling condition, using an organic alkali metal compound which has relatively good convenience.

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1. A process for anionically polymerizing a methacrylic ester or an acrylic ester, comprisingreacting a methacrylic ester or an acrylic ester in the presence of a solvent; a polymerization initiator, wherein said polymerization initiator comprises the reaction product of a compound having a 1,1-diar

1. A process for anionically polymerizing a methacrylic ester or an acrylic ester, comprisingreacting a methacrylic ester or an acrylic ester in the presence of a solvent; a polymerization initiator, wherein said polymerization initiator comprises the reaction product of a compound having a 1,1-diaryl-1-alkene structure and an organic alkali metal compound;an additive other than the solvent, wherein said additive comprises an ether compound or a tertiary polyamine compound and is present in a mole quantity of at least 0.1 times in terms of the moles of the polymerization initiator or the organic alkali metal compound; andadmixing a tertiary organoaluminum compound of formula Al-O-Ar wherein Ar is an aromatic group. 2. The process of claim 1, wherein the methacrylic ester is an ester of a primary alcohol and methacrylic acid. 3. The process of claim 1, wherein the acrylic ester is an ester of a primary alcohol and acrylic acid. 4. The process of claim 1, wherein the compound having the 1,1-diaryl-1-alkene structure is 1,1-diphenylethylene. 5. The process of claim 1, wherein the organic alkali metal compound is an organic lithium compound. 6. The process of claim 1, wherein said tertiary organoaluminum compound in which two or more of three bonds of the aluminum atom are bonded through an oxygen atom to an aromatic ring. 7. The process of claim 1, wherein an the ether compound or the tertiary polyamine compound is added to the polymerization initiator and the tertiary organoaluminium mixture. 8. The process of claim 1, wherein the polymer produced is a block copolymer comprising a methacrylic ester and an acrylic ester. 9. The process of claim 1, wherein the 1,1-diaryl-1-alkene structure is selected from the group consisting of 1,1-diphenylethylene; 1,1-bis(4-methylphenyl)ethylene; 1,1-diphenylpropene and 1,3-bis(1-phenylethenyl)benzene. 10. The process of claim 1, comprising an ether compound selected from the group consisting of diethyl ether and 1,2-dimethoxyethane. 11. The process of claim 1, comprising a tertiary polyamine selected from the group consisting of N,N,N′,N′-tetramethylethylenediamine; N,N,N′,N′-tetraethylethylenediamine; N,N,N′,N″,N″-pentamethyldiethylenetriamine; 1,1,4,7,10,10-hexamethyltriethylenetetraamine; tris[2-(dimethylamino)ethyl]amine; 1,3,5-trimethylhexahydro-1,3,5-triazine; 1,4,7-trimethyl-1,4,7-triazacyclononane; and 1,4,7,10,13,16-hexamethyl-1,4,7,10,13,16-hexaazacyclooctadecane. 12. The process of claim 1, wherein the tertiary organoaluminum compound is selected from the group consisting of isobutylbis(2,6-di-tert-butyl-4-methylphenoxy)aluminium, isobutylbis(2,6-di-tert-butyl-4-butylphenoxy)aluminium, isobutylbis[(2,2′-methylenebis(4-methyl-6-tert-butylphenoxy)]aluminium, diethyl(2,6-di-tert-butyl-4-methylphenoxy)aluminium, diethyl(2,6-di-tert-butylphenoxy)aluminium, diisobutyl(2,6-di-tert-butyl-4-methylphenoxy)aluminium, diisobutyl(2,6-di-tert-butylphenoxy)aluminum, di-n-octyl(2,6-di-tert-butyl-4-methylphenoxy)aluminum, and di-n-octyl(2,6-di-tert-butylphenoxy)aluminum. 13. The process of claim 1, wherein the additive is present in an mole amount of from 0.1 to 0.5 times in terms of the moles of the polymerization initiator or the organic alkali metal compound. 14. A process for anionically polymerizing a methacrylic ester or an acrylic ester, comprisingreacting a methacrylic ester or an acrylic ester in the presence of a solvent;a polymerization initiator, wherein said polymerization initiator comprises the reaction product of a compound having a 1,1-diaryl-1-alkene structure and an organic alkali metal compound;an additive comprised of a tertiary polyamine compound; andadmixing a tertiary organoaluminum compound of formula Al—O—Ar wherein Ar is an aromatic group.