Provided is an adhesive agent composition for a wet-type friction member, containing a resol-type phenol resin, a polyvinyl butyral, a carboxylic acid having equal to or more than 1 and equal to or less than 6 carbon atoms, and an alcohol-based solvent.

Provided is an adhesive agent composition for a wet-type friction member, containing a resol-type phenol resin, a polyvinyl butyral, a carboxylic acid having equal to or more than 1 and equal to or less than 6 carbon atoms, and an alcohol-based solvent.

A metal material connecting body, wherein a flat plate-like metal material B is connected with a flat plate-like metal material A by butting a cross section B of the metal material B against a cross section A of the metal material A, and covering at least a part of an opposing portion, which is a region spanning both an end edge portion A of the metal material A and an end edge portion B of the metal material B, with a film including a layer containing a thermoplastic resin as a main component, wherein the film is a film that has undergone melting and solidification at the opposing portion.

A welding film includes a phenoxy resin, in which a z average molecular weight of the phenoxy resin is 70,000 or more, and a ratio [Mz/Mn] between the z average molecular weight and a number average molecular weight of the phenoxy resin is 5.0 or more.

A welding film includes a phenoxy resin, in which a z average molecular weight of the phenoxy resin is 70,000 or more, and a ratio [Mz/Mn] between the z average molecular weight and a number average molecular weight of the phenoxy resin is 5.0 or more.

A manufacturing method is provided. The manufacturing method applies a bonding adhesive to at least one of the first surface of the first composite preform component or the first surface of the second composite preform component, and joins the first surface of the first composite preform component to the first surface of the second composite preform component.

A manufacturing method is provided. The manufacturing method applies a bonding adhesive to at least one of the first surface of the first composite preform component or the first surface of the second composite preform component, and joins the first surface of the first composite preform component to the first surface of the second composite preform component.