Composite building materials and methods of manufacture

1. A composite building material, comprising:

a core layer comprising a first type of polymeric fibers and a first binding agent, the first type of polymeric fibers having a first average fiber length;

a top layer disposed above the core layer and comprising a second type of polymeric fibers and a second binding agent, the second type of polymeric fibers having a second average fiber length different than the first average fiber length,

wherein the second average fiber length is less than the first average fiber length;

a bottom layer disposed below the core layer and comprising the second type of polymeric fibers and the second binding agent,

wherein an average length of polymeric fibers in the core layer is greater than an average length of polymeric fibers in the top layer and an average length of polymeric fibers in the bottom layer; and

at least one surface layer of resin-impregnated paper disposed above the top layer or below the bottom layer,

wherein the first type of polymeric fibers and the second type of polymeric fibers are compressed,

wherein at least one of the first type of polymeric fibers or the second type of polymeric fibers comprises fibers derived from at least one of a scrap fiber source, a used fiber source, a recycled fiber source, or any combination thereof,

wherein the first binding agent and the second binding agent are derived from methylenediphenyldiisocyanate (MDI) and comprise at least one of a polyurea or a polyurethane,

wherein the core layer comprises a substantially nonuniform thickness, and the core layer, the top layer, and the bottom layer together comprise a substantially uniform thickness, and

wherein the core layer, the top layer, the bottom layer, and the at least one surface layer form a rigid board or a rigid sheet.

2. The composite building material of claim 1 , wherein at least one of the first type of polymeric fibers or the second type of polymeric fibers comprises fibers derived from at least one of carpet, automotive headliners, automotive sidewalls, automotive fabrics, insulation materials, or any combination thereof.

3. The composite building material of claim 1 , wherein the first average fiber length is greater than about 25 mm.

4. The composite building material of claim 1 , wherein the substantially nonuniform thickness comprises an irregular thickness with peaks and valleys, wherein the substantially nonuniform thickness comprises a minimum thickness and a maximum thickness, and wherein the minimum thickness is less than half of the maximum thickness.

5. The composite building material of claim 1 , wherein the substantially uniform thickness comprises a minimum thickness and a maximum thickness, and wherein the minimum thickness is at least 90% of the maximum thickness.

6. The composite building material of claim 1 , wherein at least one of the core layer, the top layer, or the bottom layer comprises a polymeric filler comprising particles formed from at least one of biaxially oriented polypropylene, a polymeric film, a packaging film, a barrier packaging film, a MRF residual, or any combination thereof.

7. The composite building material of claim 1 , wherein at least one of the core layer, the top layer, or the bottom layer comprises at least one of an inorganic filler, a natural fiber filler, or fiberglass.

8. The composite building material of claim 1 , wherein at least one of (i) the core layer comprises at least one filler or additive that is not present in the top layer or the bottom layer or (ii) at least one of the top layer or the bottom layer comprises at least one filler or additive that is not present in the core layer.

9. The composite building material of claim 1 , wherein the at least one surface layer of resin-impregnated paper comprises phenolic paper.

10. A method of manufacturing a composite building material, the method comprising the steps of:

forming a core layer comprising a first type of polymeric fibers and a first binding agent, the first type of polymeric fibers having a first average fiber length;

forming a top layer comprising a second type of polymeric fibers and a second binding agent, the second type of polymeric fibers having a second average fiber length different than the first average fiber length,

wherein the second average fiber length is less than the first average fiber length;

forming a bottom layer comprising the second type of polymeric fibers and the second binding agent,

wherein an average length of polymeric fibers in the core layer is greater than an average length of polymeric fibers in the top layer and an average length of polymeric fibers in the bottom layer;

applying at least one surface layer of resin-impregnated paper above the top layer or below the bottom layer; and

heating and pressing the core layer, between the top layer and the bottom layer, and the at least one surface layer of resin-impregnated paper to form the composite building material,

wherein the first type of polymeric fibers and the second type of polymeric fibers are compressed,

wherein at least one of the first type of polymeric fibers or the second type of polymeric fibers comprises fibers derived from at least one of a scrap fiber source, a used fiber source, a recycled fiber source, or any combination thereof,

wherein the first binding agent and the second binding agent are derived from methylenediphenyldiisocyanate (MDI) and comprise at least one of a polyurea or a polyurethane,

wherein the core layer comprises a substantially nonuniform thickness, and the core layer, the top layer, and the bottom layer together comprise a substantially uniform thickness, and

wherein the composite building material comprises a rigid board or a rigid sheet.

11. The method of claim 10 , wherein at least one of the first type of polymeric fibers or the second type of polymeric fibers comprises fibers derived from at least one of carpet, automotive headliners, automotive sidewalls, automotive fabrics, insulation materials, or any combination thereof.

12. The method of claim 10 , wherein forming the core layer comprises mixing the first type of polymeric fibers with the first binding agent, and wherein forming the top layer and the bottom layer comprises mixing the second type of polymeric fibers with the second binding agent.

13. The method of claim 10 , wherein applying the at least one surface layer comprises applying a surface layer from the at least one surface layer over the top layer.

14. A composite building material, comprising:

a core layer comprising a first binding agent and a first type of polymeric fibers;

a top layer disposed above the core layer and comprising a second binding agent and a second type of polymeric fibers,

wherein an average length of the second type of polymeric fibers is less than an average length of the first type of polymeric fibers, and

wherein an average length of polymeric fibers in the core layer is greater than an average length of polymeric fibers in the top layer; and

at least one surface layer of resin-impregnated paper disposed above or below the core layer,

wherein the first type of polymeric fibers and the second type of polymeric fibers are compressed,

wherein at least one of the first type of polymeric fibers or the second type of polymeric fibers comprises fibers derived from at least one of a scrap fiber source, a used fiber source, a recycled fiber source, or any combination thereof,

wherein the first binding agent and the second binding agent are derived from methylenediphenyldiisocyanate (MDI) and comprise at least one of a polyurea or a polyurethane,

wherein the core layer comprises a substantially nonuniform thickness, and the core layer and the top layer together comprise a substantially uniform thickness, and

wherein the core layer, the top layer, and the at least one surface layer form a rigid board or a rigid sheet.

15. The composite building material of claim 14 , wherein the first type of polymeric fibers comprises a mixture of long polymeric fibers and short polymeric fibers.

16. The composite building material of claim 15 , wherein the mixture of long polymeric fibers and short polymeric fibers comprises a bimodal distribution of fiber lengths.

17. The composite building material of claim 14 , wherein at least one of the first type of polymeric fibers or the second type of polymeric fibers comprises fibers derived from at least one of carpet, automotive headliners, automotive sidewalls, automotive fabrics, insulation materials, or any combination thereof.

18. The composite building material of claim 14 , wherein the core layer comprises polymeric film particles, and wherein the polymeric film particles comprise at least one of biaxially oriented polypropylene, a packaging film, a barrier packaging film, or any combination thereof.

19. A method of manufacturing a composite building material, the method comprising the steps of:

forming a core layer comprising a first binding agent and a first type of polymeric fibers;

forming a top layer disposed above the core layer and comprising a second binding agent and a second type of polymeric fibers,

wherein an average length of the second type of polymeric fibers is less than an average length of the first type of polymeric fibers, and

wherein an average length of polymeric fibers in the core layer is greater than an average length of polymeric fibers in the top layer;

applying at least one surface layer of resin-impregnated paper above or below the core layer; and

heating and pressing the core layer, the top layer, and the at least one surface layer of resin-impregnated paper to form the composite building material,

wherein the first type of polymeric fibers and the second type of polymeric fibers are compressed,

wherein at least one of the first type of polymeric fibers or the second type of polymeric fibers comprises fibers derived from at least one of a scrap fiber source, a used fiber source, a recycled fiber source, or any combination thereof,

wherein the first binding agent and the second binding agent are derived from methylenediphenyldiisocyanate (MDI) and comprise at least one of a polyurea or a polyurethane,

wherein the core layer comprises a substantially nonuniform thickness, and the core layer and the top layer together comprise a substantially uniform thickness, and

wherein the composite building material comprises a rigid board or a rigid sheet.

20. The method of claim 19 , wherein at least one of the first type of polymeric fibers or the second type of polymeric fibers comprises fibers derived from at least one of carpet, automotive headliners, automotive sidewalls, automotive fabrics, insulation materials, or any combination thereof.

21. The method of claim 19 , wherein forming the core layer comprises adding polymeric film particles, and wherein the polymeric film particles comprise at least one of biaxially oriented polypropylene, a packaging film, a barrier packaging film, or any combination thereof.

22. The composite building material of claim 1 , wherein the rigid board or the rigid sheet is configured for use in a building product, and wherein the building product comprises at least one of siding, trim, molding, panels, roofing, or decking.

23. The composite building material of claim 1 , wherein at least one of the core layer, the top layer, or the bottom layer comprises fiberglass.

24. The composite building material of claim 1 , wherein the first type of polymeric fibers comprises fibers that are longer than 25 mm.

25. The composite building material of claim 1 , wherein the second average fiber length is less than or equal to half of the first average fiber length.