Patent ID: 9334654
Filing Date: 2016-05-10
CPC Classification: A01N,C04B,E04D,Y10T

Claim Text:
1. A roofing granule mixture, the mixture comprising two classes of algae-resistant granules, each class of algae-resistant granules including at least one algaecide, and each class of algae-resistant granules having different algaecide time-release characteristics, the two classes comprising a first class of algae-resistant granules and a second class of algae-resistant granules, the first class of algae-resistant granules comprising an inert mineral core particle covered with a layer composed of a coating composition including a first algaecidal material, the second class of algae-resistant granules comprising base particles including an inert mineral core particle covered with an inner layer composed of a coating composition including a second algaecidal material, the base particles being in turn covered with an outer coating layer comprising an outer coating composition based on a durable acrylic polymeric material, the outer coating composition being formulated to environmentally degrade over a first predetermined period.