Invention Grant
- Patent Title: Non-white roofing granules and methods of making same
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Application No.: US18028745Application Date: 2021-09-07
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Publication No.: US12071765B2Publication Date: 2024-08-27
- Inventor: Taisiya Skorina , Kristin M. Amsden , Kenton D. Budd , Rebecca L. A. Everman , Jean A. Tangeman
- Applicant: 3M INNOVATIVE PROPERTIES COMPANY
- Applicant Address: US MN St. Paul
- Assignee: 3M Innovative Properties Company
- Current Assignee: 3M Innovative Properties Company
- Current Assignee Address: US MN St. Paul
- International Application: PCT/IB2021/058134 2021.09.07
- International Announcement: WO2022/074482A 2022.04.14
- Date entered country: 2023-03-27
- Main IPC: E04D7/00
- IPC: E04D7/00

Abstract:
A plurality of non-white roofing granules is provided. The roofing granules include a plurality of particles including mineral fines and a calcia-based cement binder; and a non-white pigment-containing coating disposed on at least a portion of exterior surfaces of the particles. Methods of making the roofing granules are also provided. One method includes: mixing material including mineral fines and a calcia-based cement binder to provide agglomerates; curing the agglomerates to provide particles; and coating at least a portion of exterior surfaces of the particles with a non-white pigment-containing coating. Another method of making the roofing granules includes: providing an aqueous dispersion in a tool having cavities, the aqueous dispersion including mineral fines and a calcia-based cement binder; curing the aqueous dispersion in the tool to provide particles; and coating at least a portion of exterior surfaces of the particles with a non-white pigment-containing coating. The roofing granules exhibit an intrinsic total solar reflectance greater than 0.3. Often, the roofing granules contain by-product mineral fines.
Public/Granted literature
- US20230332409A1 NON-WHITE ROOFING GRANULES AND METHODS OF MAKING SAME Public/Granted day:2023-10-19
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