Polysiloxane treated roofing granules
AssigneeMinnesota Mining and Manufacturing Company
InventorsBilly L. George, Stefan A. Babirad, Margaret M. Nauman
Life of this patent
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Abstract
Roofing granules having surfaces treated with a polysiloxane that has a long-chain hydrocarbon group bonded to a silicon atom on the polysiloxane backbone wherein the long-chain hydrocarbon group preferably is a straight or branched aliphatic group having 5 to 30 carbon atoms and the roofing granules treated with such polysiloxanes demonstrate good dust control and water repellency, and also resist staining from oils in asphalt-based substrates.
Claims27
A roofing granule composition, which comprises:
- a plurality of colored roofing granules having surfaces treated in a post-treatment stage with an effective amount of a polysiloxane copolymer that comprises (i) siloxane units containing a hydrogen radical, a short-chain hydrocarbon group, or a combination thereof, and (ii) siloxane units containing at least one long-chain hydrocarbon group having less than 40 carbon atoms.
A roofing granule composition, which comprises:
- a plurality of roofing granules having surfaces treated with a thin film of a solution that comprises a mixture of an oil, an adhesion agent, and a polysiloxane that contains units of the formula I:
- ##STR3## where R represents a long-chain hydrocarbon group containing less than 40 carbon atoms, each R.sup.1 independently represents hydrogen or a short-chain hydrocarbon group, R.sup.2 represents R or R.sup.1, x is an integer of 3 to 300, and y is an integer of 1 to 300.
A method of making a roofing granule composition, which comprises:
- applying an effective amount of a polysiloxane copolymer to surfaces of colored roofing granules, the polysiloxane copolymer being applied to the colored roofing granules' surfaces in a post-treatment stage and comprising (i) siloxane units containing a hydrogen radical, a short-chain hydrocarbon group, or a combination thereof, and (ii) siloxane units containing at least one long-chain hydrocarbon group having less than 40 carbon atoms.
Dependencies are inferred from the claim text.