Process of impregnating substrate and impregnated substrate

摘要

Process of impregnating a layer substrate having openings which is substantially defined by opposing two main surfaces with a resin composition in the form of liquid, and the process is characterized in that one of the main surfaces and the resin composition are kept in such a contact condition that the substrate is located on the resin composition. A prepreg and a laminate are also provided which are produced by the use of the substrate which has been prepared by the above process.