Controlled time-release algae resistant roofing system
OwnerHusnu M. Kalkanoglu, Keith C. Hong +2inventors
InventorsHusnu M. Kalkanoglu, Keith C. Hong, Joong Youn Kim, Ming Liang Shiao
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Abstract
Time-release algae-resistant roofing granules have a base particle including an algaecide and an outer coating layer including another algaecide. The at least two algaecides are released over different predetermined periods. The outer layer protects the base particle from exposure to the environment for a predetermined period, then fails catastrophically so that the interior algaecide can be released.
Claims20
A process for producing time-release algae-resistant roofing granules, the process comprising:
- (a) providing base particles comprising at least one first algaecidal material;
- (b) providing an interlayer on the base particles, the interlayer enhancing the release of the at least one first algaecidal material under predetermined conditions, and
- (c) encapsulating the interlayer-covered base particles with an outer coating composition including at least one second algaecidal material to form an outer layer, the at least one second algaecidal material differing from the at least one first algaecidal material, the encapsulating outer layer protecting the base particles from exposure to the environment, the at least one second algaecidal material being releasable from the outer layer during a predetermined period.
Time-release algae-resistant roofing granules, each granule comprising:
- (a) a base particle comprising at least one first algaecidal material;
- and
- (b) an interlayer formed on the base particles, the interlayer enhancing the release of the at least one first algaecidal material under predetermined conditions, and
- (c) at least one outer coating layer formed from an outer coating composition including at least one second algaecidal material and encapsulating the base particle, the at least one second algaecidal material differing from the at least one first algaecidal material, the encapsulating at least one outer layer protecting the base particle from exposure to the environment, the at least one second algaecidal material being releasable from the outer layer during a predetermined period.
Dependencies are inferred from the claim text.