Hardening asphalt for roofing applications

A roofing shingle comprising:

• (a) a roofing substrate;
• and
• (b) a filled coating applied to the roofing substrate, the filled coating comprising:
• (i) asphalt;
• wherein the asphalt has a softening point of 100° F. to 200° F. as measured according to ASTM D3461;
• (ii) at least one hardening agent,
• wherein the at least one hardening agent has a softening point of 150° F. to 300° F. as measured according to ASTM D3461,
• wherein the at least one hardening agent is mixed with the asphalt in a weight ratio of 1:100 to 1:2 to form a hardened asphalt, and
• wherein the hardened asphalt has (i) a softening point that is greater than the softening point of the asphalt and (ii) a viscosity that is great than a viscosity of the asphalt when tested at 400° F.;
• (iii) at least one polymer,
• wherein the at least one polymer is mixed with the hardened asphalt in a weight ratio of 1:100 to 1:5 to form a polymer modified asphalt (PMA), and
• wherein the PMA has a softening point that is greater than the softening point of the asphalt;
• and
• (iv) at least one filler,
• wherein the at least one filler comprises at least one of limestone, glass, calcium carbonate, barium sulfate, calcium sulfate, talc, perlite, silica, quartz, aluminum trihydrate, magnesium hydroxide, ammonium polyphosphate, colemanite, titanium dioxide, fly ash, graphene nanoparticles, carbon black, basalt, roofing granules, graphite, clay, or any combination thereof, and wherein the filled coating comprises (i) 10% to 70% by weight of the at least one filler based on a total weight of the filled coating, and (ii) 30% to 90% by weight of the PMA based on the total weight of the filled coating, and
• wherein the filled coating has a thickness of 20 mil to 200 mil.