| abstract |
(57) [Problem] To provide an interlayer adhesive for producing a laminated paper, the particle size of the sprayed interlayer strength improver is not as fine as polyion complex or emulsion. Since it has the same particle size as starch, it hardly flows out together with water in the dewatering press part or suction part, and as a result, the same interlayer strength is exhibited with the addition amount of 1/5 to 1/10 of starch To provide an interlayer strength improver. An ionic water-soluble monomer and a nonionic monomer copolymerizable with the ionic water-soluble monomer in the presence of inorganic particles coexist with a polymer dispersant soluble in the salt aqueous solution. Let This can be achieved by adding, under stirring, an interlayer strength improver composed of a dispersion of ionic polymer fine particles containing inorganic particles having a particle size of 100 μm or less obtained by dispersion polymerization. |