Shingle tear strength with fiber mixture of different fibers
View Patent ↗A coated fiber mat of improved tear strength upon dividing pieces of the coated mat and the coating is provided. The coated mat is a cured, non-woven mat including a mixture of fibers having different fiber lengths. The fibers contain a polysiloxane compound and are fixedly distributed in a binder.
1. An asphalt coated roofing material comprising a cured non-woven mat that comprises a mixture of fibers having different fiber lengths, said fibers containing a polysiloxane compound, and fixedly distributed in a binder.
2. The asphalt coated roofing of claim 1 wherein from about 0 to about 100 weight % of said fibers have a fiber length of from about 0.5 to about 60 mm, and from about 0 about 100 weight % of said fibers of said fibers have a preferable fiber length of from about 0.5 to about 60 mm.
3. The asphalt coated roofing material of claim 1 wherein said fibers comprise fibers of glass, wood, polyethylene, polypropylene, polyester, nylon and Orlon acrylic fibers or mixtures thereof.
4. The asphalt coated roofing material of claim 3 wherein said fibers are glass fibers having an average diameter of from about 1 to about 100 μm.
5. The asphalt coated roofing material of claim 1 wherein said fibers are present in an amount of from about 50 to about 95 weight %, said polysiloxane is present in an amount of from about 0.001 to about 20 weight % and said binder is present in an amount of from about 5 to about 50 weight %.
6. The asphalt coated roofing material of claim 1 wherein said binder is formaldehyde type binder containing between about 0.1 and about 20 weight % of a crosslinked styrene/(meth)acrylic polymer binder modifier.
7. The asphalt coated roofing material of claim 6 wherein said formaldehyde type binder comprises formaldehyde and a compound selected from the group consisting of urea phenol, resorcinol, melamine and mixtures thereof.
8. The asphalt coated roofing material of claim 7 wherein said compound is urea.
9. The asphalt coated roofing material of claim 6 where the styrene/(meth)acrylic polymer is crosslinked with a polyfunctional nitrogen-containing crosslinking agent.
10. The asphalt coated roofing material of claim 1 wherein said polysiloxane is polyalkylsiloxane.
11. The asphalt coated roofing material of claim 10 wherein said polyalkylsiloxane is polydimethylsiloxane.
12. The asphalt coating roofing material of claim 1 wherein said fibers are glass fibers.
13. The asphalt coated roofing material of claim 1 wherein said material is a shingle.
14. The asphalt coated roofing material of claim 1 wherein said material is a sheet or roll.