To provide a paper having excellent gas barrier property and excellent in defibration in a disaggregation process in a waste paper recycling plant.

The paper is laminated with a barrier coat layer containing a high-nitrile copolymer latex as a coating agent containing pas barrier property. The high-nitrile copolymer latex is obtained by the emulsion polymerization of 100 pts. wt. of a monomer mixture consisting of 70-95 wt.% of acrylonitrile and 5-30 wt.% of one or more kinds of vinyl monomers copolymerizable with acrylonitrile in the presence of 3-25 pts. wt. of a polyvinyl alcohol having a viscosity of 2-50 mPa.s and a degree of saponification of ≥95.5 mol%.