Methods for producing laminate and substrate for mounting a semiconductor device

A method for producing a laminate, comprising at least:

• providing a first intermediate laminate comprising a carrier substrate including a support in the carrier substrate and a peelable metal layer formed on at least one surface of the carrier substrate,
• forming, in a section to be cut and removed from the laminate, the section corresponding to a section not constituting a substrate for mounting a semiconductor device, a first hole reaching at least the support in the carrier substrate from a surface of the first intermediate laminate, to prepare a second intermediate laminate with the first hole,
• stacking and disposing on the surface where the first hole is formed of the second intermediate laminate, an insulating material and a metal foil in this order when viewed from the surface, and pressurizing the second intermediate laminate, the insulating material and the metal foil in a stacking direction of the insulating material and the metal foil with heating, to prepare a third intermediate laminate where the first hole is filled with the insulating material, and
• performing treatment with a chemical agent on the third intermediate laminate where the first hole is filled with the insulating material.