Dual layer shingle

Details Dual layer shingle Dual layer shingle

2006-05-23

2006-05-23

Canfiled, Robert (Department: 3635)

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

C428S141000, C052S518000, C052S559000

Reexamination Certificate

active

07048990

ABSTRACT:
A shingle formed from a base sheet, with a layer of polymer modified asphalt coating the top of the base sheet, and a layer of conventional oxidized asphalt, free from polymer additives, coating the bottom of the base sheet. Both layers preferably directly contact the strands of the base sheet for good adhesion. This improves the strength, flexibility and ultraviolet resistance of the shingle, while reducing the cost as compared with a shingle which utilized only polymer modified asphalt, and in addition it increases the stiffness of the shingle as compared with one using only polymer modified asphalt.

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Hawley's Condensed Chemical Distionary, Lewis, 1997, John Wiley & Sons, Inc., 13, 904, 905.

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