Abstract: The invention is to provide an aqueous dispersion having good adhesiveness, especially airtight adhesiveness to various substrates, and having good storage stability, good weather resistance and good hydrophobicity. The aqueous dispersion comprises a block copolymer composed of polymer blocks (A) consisting essentially of olefin monomer units and polymer blocks (B) comprising from 2 to 100 mol % of units of vinyl monomers having a carboxyl group or a carboxylic acid anhydride group and from 0 to 98 mol % of units of other vinyl comonomers capable of copolymerizing with the vinyl monomers, dispersed in an aqueous solution of at least 0.05 equivalents, relative to the carboxyl group or the carboxylic acid anhydride group, of a basic substance.

Abstract: A process for the preparation of an acrylic acid ester polymer, includes carrying out polymerization of an acrylic acid ester or block copolymerization of an acrylic acid ester and another (meth)acrylic monomer in the presence of an organolithium compound and an organoaluminum compound represented by the following formula (I):

Abstract: A process for the preparation of an acrylic acid ester polymer, includes carrying out polymerization of an acrylic acid ester or block copolymerization of an acrylic acid ester and another (meth)acrylic monomer in the presence of an organolithium compound and an organoaluminum compound represented by the following formula (I): AlR1R2R3  (I) wherein R1 represents an alkyl group having at least 3 carbon atoms, an alkoxy group having at least 3 carbon atoms or an aryloxy group, R2 and R3 each independently represent an aryloxy group or may be coupled together to form an arylenedioxy group. The process makes it possible to increase the reaction rate and living properties upon polymerization and increase the block formation efficiency upon block copolymerization.