Acoustical sound proofing material with controlled water-vapor permeability and methods for manufacturing same

A laminated structure having a selected area, said laminated structure being appropriate for use in constructing walls, floors, ceilings or doors and comprising:

• two external layers of a non-metallic material each having an outer and an inner surface;
• at least one internal constraining layer having an area less than said selected area;
• and
• two or more internal layers of a viscoelastic glue in direct contact with the inner surface of the external layers and separated by said at least one internal constraining layer,
• each of said layers of viscoelastic glue having an area between about twenty (20%) and about eighty (80%) percent of said selected area, and wherein
• the internal layers of viscoelastic glue each have a portion not overlapped by one or more of the other internal layers of viscoelastic glue or by the internal constraining layer;
• thereby allowing moisture to pass through the resulting structure.

A laminated structure comprising:

• at least one internal layer of a selected material having an upper and a lower surface;
• two internal layers of a viscoelastic glue, one such layer on each of the upper and the lower surface of said internal layer;
• and
• at least one additional layer of a material on the other side of each internal layer of viscoelastic glue, wherein
• the two internal layers of viscoelastic glue each occupy an area less than the between about twenty (20%) and about eighty (80%) percent of area of said at least one additional layer of a material on the other side of each internal layer of viscoelastic glue, and wherein
• the internal layers of the viscoelastic glue and the at least one internal layer of selected material occupies an area less than the area of said at least one additional layer of a material on the other side of each internal layer of viscoelastic glue;
• and the internal layer of a selected material have a portion not overlapped by any of the other internal layers of viscoelastic glue or by the internal layer of a selected material;
• thereby allowing vapor to pass through said laminated structure.

A laminated structure appropriate for use in constructing walls, floors, or ceilings or doors comprising:

• two external layers of a non-metallic material each having an outer and an inner surface;
• at least one internal constraining layer, and
• two or more internal layers of a viscoelastic glue in direct contact with the inner surface of the external layers and separated by said at least one internal constraining layer, wherein
• the at least one internal constraining layer is selected from the group consisting of cellulose, wood, metal, plastic, vinyl, plastic composite and rubber, and wherein the at least one internal constraining layer
• occupies an area of said laminated structure less than the area of said laminated structure, and each of said layers of viscoelastic glue is patterned to cover between about twenty (20%) and about eighty (80%) percent of the area of said laminated structure, and wherein
• the internal layers of viscoelastic glue and the at least one internal constraining layer each have a portion not overlapping by the other internal layers of viscoelastic glue or by the internal constraining layer;
• thereby allowing the passage of moisture through said laminated structure.

A method of forming a laminated structure appropriate for use in constructing walls, floors, ceilings or doors, said laminated structure having a selected area, said laminated structure capable of passing moisture from one side to the other side of the laminated structure, said method comprising:

• forming two external layers of one or more materials each having an outer and an inner surface;
• forming at least one internal constraining layer between said two external layers, the area of said at least one internal constraining layer being less than said selected area;
• and
• joining said two external layers to said at least one internal layer using two or more internal layers of a viscoelastic glue in direct contact with the inner surface of the external layers and separated by said at least one internal constraining layer, wherein
• each of said layers of viscoelastic glue is patterned to cover between about twenty (20%) and about eighty (80%) percent of said area of said laminated structure, and wherein
• the internal layers of viscoelastic glue and the internal constraining area each have a portion not overlapped of the other internal layers of viscoelastic glue or the internal constraining layer;
• thereby allowing moisture to pass through the resulting structure.