Paper composite, packaging material, and production method of paper composite

A production method of a paper composite, the production method comprising:

• coating the at least one surface side of a paper substrate with a composition for forming a greaseproof layer,
• the paper substrate having an air permeation resistance of 1,000 sec or less and a bulk density of 0.5 g/cm3 or greater and 1.0 g/cm3 or less, and
• the composition for forming a greaseproof layer comprising:
• a vinyl alcohol polymer (A) having a content of an ethylene unit of 2 mol % or greater and 10 mol % or less, a viscosity average degree of polymerization of 300 or greater and 2,000 or less, and a degree of saponification of 91.5 mol % or greater and 99.5 mol % or less;
• and
• a cationic fluorine-containing copolymer (B) having:
• a constitutional unit derived from a monomer (a) being a (meth)acrylate having a polyfluoroalkyl group having 1 to 6 carbon atoms;
• and a constitutional unit derived from a monomer (b) being a compound represented by formula (1):
• CH2═C(R1)COO-Q-N(R2)(R3),
• wherein R1 represents a hydrogen atom or a methyl group;
• Q represents:
• an alkylene group having 2 to 3 carbon atoms in which a part or all of hydrogen atoms are substituted with a hydroxyl group, or an alkylene group having 2 to 4 carbon atoms;
• and R2 and R3 each independently represent a benzyl group or an alkyl group having 1 to 8 carbon atoms, or R2 and R3 taken together represent a morpholino group, a piperidino group or a pyrrolidinyl group together with the nitrogen atom;
• and
• drying the paper substrate having been subjected to the coating, to obtain a paper composite comprising:
• the paper substrate;
• and a greaseproof layer formed on the at least one surface side of the paper substrate, wherein
• a content of the cationic fluorine-containing copolymer (B) is 5 parts by mass or greater and 50 parts by mass or less with respect to 100 parts by mass of the vinyl alcohol polymer (A),
• an amount of the greaseproof layer being overlaid on dry mass basis is 0.1 g/m2 or greater and 3.0 g/m2 or less, and
• a water vapor permeability of the paper composite is 1,000 g/m2·24 h or greater.