Hybrid coating for roof applications
AssigneeJohns Manville
InventorsChangQing Shen, Joel Hazy, Julian Metz, Lance Wang
Life of this patent
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Abstract
Embodiments may include a coated granule for roofing systems. The coated granule may include an aluminum silicate granule and a coating disposed on the aluminum silicate granule. The coating may include a copolymer and a siloxane-based or a silane-based compound. The copolymer may be a cationic fluorinated (meth)acrylic copolymer. The aluminum silicate granule may have a particle size in a range from 0.2 mm to 2.4 mm. The aluminum silicate granule may have a 65% or greater reflectivity. The coated granule may repel oil and maintain its reflectivity better than with other techniques.
Claims20
A coated granule for roofing systems, the coated granule comprising:
- an aluminum silicate granule;
- and
- a coating disposed on the aluminum silicate granule, the coating comprising:
- a copolymer, and
- a siloxane-based or a silane-based compound;
- wherein:
- the siloxane-based or silane-based compound is 60 wt. % or more of the coating and a mass ratio of the siloxane-based or silane-based compound to the copolymer is from 2:1 to 3:1,
- the copolymer is a cationic fluorinated (meth)acrylic copolymer,
- the aluminum silicate granule has a particle size in a range from 0.2 mm to 2.4 mm, and
- the aluminum silicate granule has a 65% or greater reflectivity.
A method of manufacturing a coated granule, the method comprising:
- coating a plurality of aluminum silicate granules with a mixture comprising:
- a copolymer, and
- a siloxane-based or silane-based compound, wherein the siloxane-based or silane-based compound is 60 wt. % or more of the coating and a mass ratio of the siloxane-based or silane-based compound to the copolymer is from 2:1 to 3:1;
- and
- drying the coating on the plurality of aluminum silicate granules to form a plurality of coated granules,
- wherein:
- the copolymer is a cationic fluorinated (meth)acrylic copolymer,
- the plurality of aluminum silicate granules has a particle size in a range from 0.2 mm to 2.4 mm, and
- the plurality of aluminum silicate granules has a 65% or greater reflectivity.
A method of manufacturing a coated granule, the method comprising:
- coating a plurality of aluminum silicate granules with a hybrid coating, wherein the hybrid coating comprises:
- a copolymer comprising a cationic fluorinated (meth)acrylic copolymer, wherein the cationic fluorinated (meth)acrylic copolymer reduces absorption of asphaltic chemical by the aluminum silicate granules;
- and
- a siloxane-based or silane-based compound, wherein the siloxane-based or silane-based compound:
- is 60 wt. % or more of the coating;
- comprises a mass ratio of the siloxane-based or silane-based compound to the copolymer is from 2:1 to 3:1;
- and
- comprises at least one of polydimethylsilxane or organosiloxane,
- wherein the hybrid coating, when coated onto an uncoated aluminum silicate granule, comprises from 0.001% to 3.0% by weight of the uncoated aluminum silicate granule;
- and
- drying the coating on the plurality of aluminum silicate granules to form a plurality of coated granules,
- wherein:
- the copolymer is a cationic fluorinated (meth)acrylic copolymer,
- the plurality of aluminum silicate granules has a particle size in a range from 0.2 mm to 2.4 mm, and
- the plurality of aluminum silicate granules has a 65% or greater reflectivity.
Dependencies are inferred from the claim text.