Polyolefin materials with reduced oxygen permeability
AssigneeJohns Manville
InventorLichh R. Peng
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Abstract
Polymer compositions with reduce oxygen permeability are described. The polymer compositions may include one or more polyolefin polymers, and a nanoparticle filler. The nanoparticle filler represents about 2 wt. % to 5 wt. % of the weight of the polymer composition and reduce the oxygen permeability of the composition by about 20% or more. Also described are roofing systems that may include an insulation layer and a thermoplastic polyolefin layer made using the polymer compositions to protect the insulation layer from weather degradation.
Claims20
A polymer composition with reduced oxygen permeability, the polymer composition comprising:
- one or more thermoplastic olefin polymers, wherein the thermoplastic olefin polymers comprise polyethylene or polypropylene;
- and
- one or more cyclic olefin copolymers comprising an acyclic olefin and a cyclic olefin, wherein the polymer composition has about 2 wt. % to about 5 wt. % cyclic olefin copolymers, and wherein the only cyclic olefins in the polymer composition are found in the one or more cyclic olefin copolymers;
- 2 wt. % to 5 wt. % of nanoparticle filler treated with an intercalant comprising a polar, hydrophilic moiety to interface with the polar surfaces of the nanoparticle filler and a non-polar moiety to interface with non-polar, hydrophobic olefin monomers, oligomers, and polymers;
- and
- a stabilizer to slow the degradation caused by oxidation or to absorb ultra-violet radiation.
A polymer nanocomposite comprising:
- a film treated with an intercalant comprising a polar, hydrophilic moiety to interface with the polar surfaces of the nanoparticle filler and a non-polar moiety to interface with non-polar, hydrophobic olefin monomers, oligomers, and polymers comprising a thermoplastic polyolefin matrix and a nanoparticle filler,
- wherein the nanoparticle filler is 2 wt. % to 5 wt. % of the polymer nanocomposite, and wherein the nanoparticle filler reduces the oxygen permeability of the film by about 20% or more,
- wherein the thermoplastic polyolefin matrix comprises:
- one or more thermoplastic olefin polymers comprising polyethylene or polypropylene;
- and
- one or more cyclic olefin copolymers comprising an acyclic olefin and a cyclic olefin, wherein the thermoplastic polyolefin matrix has about 2 wt. % to about 5 wt. % cyclic olefin copolymers, and wherein the only cyclic olefins in the thermoplastic polyolefin matrix are found in the one or more cyclic olefin copolymers.
A roofing system comprising:
- an insulation layer;
- a thermoplastic polyolefin layer positioned over the insulation layer to protect the insulation layer from weather degradation, wherein:
- the thermoplastic polyolefin layer comprises:
- a thermoplastic polyolefin matrix, and
- 2 wt. % to 5 wt. % of nanoparticle filler treated with an intercalant comprising a polar, hydrophilic moiety to interface with the polar surfaces of the nanoparticle filler and a non-polar moiety to interface with non-polar, hydrophobic olefin monomers, oligomers, and polymers;
- wherein
- the thermoplastic polyolefin matrix comprises:
- one or more thermoplastic olefin polymers, wherein the one or more thermoplastic olefin polymers comprise polyethylene or polypropylene;
- one or more cyclic olefin copolymers, wherein about 2 wt. % to about 5 wt. % of the thermoplastic polyolefin matrix is the one or more cyclic olefin copolymers, and wherein the only cyclic olefins in the thermoplastic polyolefin layer are found in the one or more cyclic olefin copolymers;
- and
- a stabilizer,
- wherein the nanoparticle filler reduces the oxygen permeability of the thermoplastic polyolefin layer by about 20% or more.
Dependencies are inferred from the claim text.