Patent ID: 9538762
Date: 2017-01-10
CPC Classifications: A01N,E04D,Y10T

Claim:
1. An algae-resistant sheet roofing product including a bituminous base and roofing granules, the sheet roofing product comprising: base particles comprising an inert mineral directly adhered to the bituminous base; and an antimicrobial delivery system fused to the bituminous base at an interface where the base particles adhere to the bituminous base, the antimicrobial delivery system comprising a polymer carrier compounded with an antimicrobial material comprising particles of a metal or a metal compound; wherein the polymer carrier independently encapsulates the particles of the antimicrobial material such that degradation of the polymer carrier due to natural weathering releases the antimicrobial material over the period of degradation; wherein the polymer carrier does not encapsulate the base particles; wherein the polymer carrier is selected from the group consisting of nylons, polyester block amide, ethylene-chlorotrifluoroethylene, acrylonitrile butadiene styrene, and styrene ethylene butadiene copolymer; wherein the antimicrobial delivery system is configured to be fused to the sheet roofing product via a hot asphalt coating proximate to an interface where the base particles adhere to the asphalt coating, wherein the antimicrobial material comprises cuprous oxide and zinc borate; and wherein the weight ratio of the polymer carrier to cuprous oxide to zinc borate is about 80:10:10.