OPAQUE CONTAINERS CONTAINING COLORED RECYCLED POLYESTER
The present invention relates to a composition comprising a colored recycled polyethylene terephthalate (RPET) and an opacifying material. The composition can further comprise a virgin polyethylene terephthalate (PET), a high gas barrier or an oxygen scavenging compound. Suitable opacifying material, suitable high gas barrier polymer and suitable oxygen scavenging compound are disclosed herein. Other embodiments of the present invention include articles produced from these compositions and processes for producing these compositions.
1 . A composition comprising a colored recycled polyethylene terephthalate and an opacifying material.
2 . The composition of claim 1 , wherein said opacifying material comprises at least one member selected from the group consisting of i) metal powder, ii) metal oxides of aluminum, titanium, zinc, tin, zirconium and silicon; iii) silica, iv) fumed silica, v) fumed alumina, vi) metal silicates of aluminum and calcium; vii) carbonates of calcium, barium, zinc and magnesium; viii) sulfides of calcium, barium, zinc and magnesium; ix) sulfates of calcium, barium, zinc and magnesium; x) clays, xi) nanoclays, xii) mica, xiii) opaque recycled polyethylene terephthalate, and xiv) mixtures thereof.
3 . The composition of claim 2 , wherein said metal powder comprises at least one member selected from the group consisting of aluminum, copper, iron, zinc, tin and mixtures thereof.
4 . The composition of claim 3 , wherein said metal powder is aluminum.
5 . The composition of claim 1 , wherein said opacifying material is present in a concentration from about 0.1 weight % to about 5 weight %.
6 . The composition of claim 1 , wherein said colored recycled polyethylene terephthalate is present in a concentration of at least about 10 weight %.
7 . The composition of claim 1 , further comprising virgin polyethylene terephthalate.
8 . The composition of claim 1 , further comprising a high gas barrier polymer.
9 . The composition of claim 1 , further comprising an oxygen scavenging polymer.
10 . An article comprising a colored recycled polyethylene terephthalate and an opacifying material.
11 . The article of claim 10 , further comprising virgin polyethylene terephthalate.
12 . An article made from a polyester resin comprising a recycled polyethylene terephthalate and an opacifying material.
13 . The article of claim 12 , further comprising virgin polyethylene terephthalate.
14 . A process for making a polyester resin performs comprising: pelletizing unsorted clean, colored and opaque flakes, introducing said pelletized flakes into an injection-molding machine to melt said flakes and injection-molding said molten flakes into a preform.
15 . The process of claim 14 , wherein after said pelletizing, said pellets are solid-state polymerized to increase the viscosity.
16 . The process of claim 14 or 15 , wherein said step of introducing pelletized flakes also includes introducing additional opacifying material into the injection molding machine.
17 . A process for making colored, opacified recycled polyethylene terephthalate pellets comprising: pelletizing unsorted, colored and opaque recycled polyethylene terephthalate flakes and optionally solid-state polymerization.
18 . The process of claim 17 , wherein additional opacifying material and optionally clear flakes, are added during said pelletizing to provide pellets of the correct color specification.
19 . A process for making colored, opacified recycled polyethylene terephthalate pellets comprising: adding unsorted, colored and opaque recycled polyethylene terephthalate flakes in a glycolysis process, or to the monomer after esterification, to form a colored monomer; and polycondensating said monomer to a polyester resin.