Weatherable polyolefin nanocomposites
View Patent ↗A method is disclosed concerning discovering how the use of an additive in a polyolefin compound affects the weatherability of that compound, Applying that technique, a weatherable polyolefin nanocomposite is disclosed, which contains UV stabilizers that filter wavelengths in a range influenced by presence of organoclay in the nanocomposite.
1. A weatherable polyolefin nanocomposite, comprising:
(a) polyolefin
(b) organoclay,
(c) compatibilizer, and
(d) UV stabilizers that filter wavelengths in a range influenced by presence of organoclay in the nanocomposite, wherein the organoclay is montmorillonite clay intercalated with an organic or semi-organic chemical.
2. The nanocomposite of claim 1 , wherein polyolefin comprises any of homopolymers, copolymers, blends of polymers, mixtures of polymers, alloys of polymers, and combinations thereof, where at least one of the polymers is polymerized from an olefin monomer having 2 to 8 carbon atoms.
3. The nanocomposite of claim 2 , wherein the polyolefin comprises wherein the polyethylene comprises low-density polyethylene, high-density, high molecular weight polyethylene, ultra-high molecular weight polyethylene, linear-low-density polyethylene, very-low density polyethylene, maleated polypropylene, polypropylene, polybutylene, polyhexene, polyoctene, and copolymers thereof, and ethylene-vinyl-acetate copolymer, and mixtures, blends or alloys of any of them.
4. The nanocomposite of claim 1 , further comprising an impact modifier.
5. The nanocomposite of claim 4 , wherein the impact modifier is selected from the group consisting of natural rubber, polyisoprene rubber, styrene-butadiene rubber, polybutadiene rubber, nitrile rubber, butyl rubber, ethylene-propylene-diene rubber (EPDM), ethylene-propylene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, and combinations thereof.
6. The composite of claim 1 , wherein the compatibilizer is maleic anhydride grafted polypropylene.
7. The composite of claim 1 , wherein the UV stabilizer is a chemical which has good absorption above 320 nm.
8. The composite of claim 7 , wherein the UV stabilizer chemical filters light above 320 nm.
9. The composite of claim 8 , wherein the UV stabilizer is a benzotriazole or a monomeric high molecular weight, sterically hindered amine light stabilizer.
10. The composite of claim 1 , wherein the composite further includes optional additives.
11. The composite of claim 1 , wherein the composite further includes optional polymers.
12. An article made from the weatherable polyolefin nanocomposite of claim 1 .
13. The article of claim 12 , wherein the article is a film of one layer or multiple layers.
14. The composite of claim 3 , wherein the organoclay is montmorillonite clay intercalated with an organic or semi-organic chemical.
15. The composite of claim 3 , wherein the compatibilizer is maleic anhydride grafted polypropylene.
16. The composite of claim 3 , wherein the UV stabilizer is a chemical which has good absorption above 320 nm.
17. The composite of claim 16 , wherein the UV stabilizer chemical filters light above 320 nm.
18. The composite of claim 17 , wherein the UV stabilizer is a benzotriazole or a monomeric high molecular weight, sterically hindered amine light stabilizer.