Abstract: The filler of the present invention is characterized by comprising hexagonal phosphate particles represented by formula (1) and having a median diameter of 0.05 ?m or more and 10 ?m or less based on the volume as measured by a laser diffraction particle size analyzer. The method for producing a hexagonal phosphate of the present invention is characterized by comprising the steps of: mixing a tetravalent laminar metal phosphate, a compound of at least one divalent metal selected from the group consisting of alkaline earth metals, Zn, Cu, Ni and Mn, and an m-valent metal compound to obtain a mixture; and calcinating the mixture to obtain a hexagonal phosphate represented by formula (1). AxByCz(PO4)3.

Abstract: An object of the present invention is to provide an active energy beam-curable adhesive composition that has excellent adhesive power under any conditions of high temperature or high humidity, gives little coloration even when used for a long period of time, and gives no deposition of constituents in cold districts. An active energy beam-curable adhesive composition that contains (A) a urethane (meth)acrylate having a polyester skeleton or a polycarbonate skeleton, (B) a phenol compound having one or more —C(CH3)2R groups (R denotes an alkyl group or a phenyl group) in a phenyl group, (C) a phosphite ester compound (provided that it is one having solubility in the composition), and (D) an ethylenically unsaturated group-containing compound other than component (A) above.