Algae resistant roofing granules with controlled algaecide leaching rates, algae resistant shingles, and process for producing same

• Main Authors: JOHNSON ANDREW G, SALVATORE JAMES A, HARDY ANNE B, KALKANOGLU HUSNU M, SHIAO MING L, HONG KEITH C
• Format: Patent
• Language: English
• Published: 23.12.2004
• Edition: 7
• Subjects: BUILDING; FIXED CONSTRUCTIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GUTTERS; ROOF COVERINGS; ROOF-WORKING TOOLS; SKY-LIGHTS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

Algae-resistant roofing granules are formed by extruding a mixture of mineral particles and a binder to form porous granule bodies, and algaecide is distributed in the pores. Release of the algaecide is controlled by the structure of the granules.