Method of forming multilayer container with polyethylene naphtha

Details Method of forming multilayer container with polyethylene naphtha Method of forming multilayer container with polyethylene naphtha

1994-12-05

1997-05-13

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264513, 428 357, 428 3691, B29C 4922

Patent

active

056289570

ABSTRACT:
A multilayer preform and container, and method of forming the same, having at least one layer including polyethylene naphthalate (PEN) to provide enhanced oxygen barrier performance and thermal stability. The PEN layer may be a homopolymer, copolymer, or blend of PEN. In a first high-PEN embodiment, the exterior layer contains on the order of 80-100% PEN and 0-20% PET by total weight of the layer, and a core layer of a non-strain hardenable polyester such as PETG. In a second low-PEN embodiment, the exterior layer includes a strain hardenable low-PEN copolymer or blend including on the order of 1-20% PEN and 80-99% PET, and the core layer is a strain-hardenable polyester such as a low-copolymer PET. In a third mid-range PEN embodiment, the exterior wall includes a substantially amorphous PEN copolymer or blend containing on the order of 20-80% PEN and 80-20% of another polyester such as PET, and a strain-hardened core layer of polyester such as a low-copolymer PET. To further enhance the oxygen barrier and thermal stability properties, the core layer may further include a copolymer or blend of PEN. Alternatively, PEN may be provided in an interior layer only.

REFERENCES:
patent: 5035931 (1991-07-01), Yamada et al.
patent: 5066613 (1991-11-01), Shepherd et al.
patent: 5213856 (1993-05-01), Po et al.
patent: 5221507 (1993-06-01), Beck et al.
patent: 5352401 (1994-10-01), Dalgewicz, III et al.
patent: 5443766 (1995-08-01), Slat et al.
Research Disclosure, vol. 294, No. 29410, Oct. 1988, New York, NY, USA, pp. 714-719, XP 000068665, Disclosed Anonymously, "Poly(Ethylene Naphtalenedicarboxylate)Poly(Ethylene Terephtalate) Blends".

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