Method of producing roofing shingle coating asphalt from...

Compositions: coating or plastic – Coating or plastic compositions – Bituminous material or tarry residue

Reexamination Certificate

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C106S270000, C106S285000

Reexamination Certificate

active

07951239

ABSTRACT:
A method of producing a roofing shingle coating asphalt from a non-coating grade asphalt feedstock includes the following steps. The non-coating grade asphalt feedstock is partially blown to lower its penetration to a first penetration that is within or close to a target penetration range of the coating asphalt, and to raise its softening point to a first softening point that is lower than a target softening point range of the coating asphalt. Then a wax is added to the partially blown non-coating grade asphalt to further raise its softening point to a second softening point that is within the target softening point range to produce the coating asphalt.

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