Adhesive copolymer microspheres-containing aqueous suspension and method for producing the same

Claim 1

An aqueous suspension composition comprising: (A) adhesive copolymer microspheres having an average particle diameter of 10-100μ prepared by aqueous suspension polymerization of 100 parts by weight comprising the following monomers (a), (b) and (c) in the presence of a protective colloid comprising casein as a main ingredient: (a) from 70 to 99.9 percent by weight of at least one monomer selected from the group consisting of alkyl acrylate esters and alkyl methacrylate esters, in which said alkyl moiety has 4-12 carbon atoms, (b) from 0.1 to 10 percent by weight of at least one α-monoolefin carboxylic acids, and (c) from 0 to 29.9 percent by weight of at least one monomer other than the foregoing (a) and (b), selected from the group consisting of acrylates and methacrylates and (B) homopolymer or copolymer microparticles having an average particle diameter of 0.1-4μ prepared by polymerization of 20-300 parts by weight of at least one monomer selected from the group consisting of acrylates and methacrylates in an aqueous medium.