Process for applying copolyester barrier layer on polyester container
AssigneeOwens-Illinois, Inc.
InventorsSaleh A. Jabarin, Gregory M. Fehn
Life of this patent
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Abstract
A polyester or copolyester container is made with a heat activated high barrier copolyester label applied to the container sidewall. The process for producing the high barrier container that is a hollow polyester or copolyester body with a barrier label effectively applied to its outer sidewall, includes forming the container by an extrusion blow method, injection blow method, orientation-blow method, or orientation blow-heat set method and applying the barrier label via an "in-mold" technique utilizing a heat-activatable high barrier copolyester resin as the adhesive.
Claims13
A method of providing a high barrier plastic label to a hollow polyester container having an outer polyester wall surface, the method comprising the steps of:
- A. forming a heat activatable, high barrier copolyester adhesive layer on the inside surface of a low permeation labeling film to form a label the copolyester being a reaction product of isophthalic acid or terephthalic acid, ethylene glycol, and 1,3 bis (2-hydroxy)benzene,
- B. forming a polyester container having a body and an outer polyester wall surface,
- C. applying the label to the outer wall surface of the container, and
- D. heating the label and container to soften the copolyester adhesive layer sufficiently to stick to the polyester wall and form an adhesive bond in a boundary area between the label and the wall.
A method of providing a high barrier plastic label to a sidewall of a body portion of a polyethylene terephthalate container, the method comprising the steps of:
- A. forming a solid thermoplastic copolyester label around the body sidewall of the container, the label including an adhesive copolyester layer that contacts the sidewall, the copolyester being a reaction product of
- (1) an isophthalic acid or terephthalic acid
- (2) ethylene glycol and 1,3 bis (2-hydroxyethoxy) benzene, the copolyester having an I.V. of at least about 0.6, a glass transition temperature of about 60.degree. to 75.degree. C., an oxygen permeability of about 1 to 6 and a CO.sub.2 permeability of about 5 to 10 cc/mil/100 inch.sup.2 day atmosphere;
- and
- B. heating the label and container to at least about 100.degree. C. to soften the label to form an adhesive boundary between the label and the container sidewall.
A hollow polyester or copolyester container having an outer sidewall surface, a high barrier copolyester material label bonded to the outer sidewall surface by a boundary layer between the container sidewall and the label formed by a copolyester adhesive layer of the label contacting and adhered to the sidewall surface, the copolyester layer material being a reaction product of isophthlatic acid, ethylene glycol and 1,3 bis (2-hydroxyethyoxy) benzene.
Dependencies are inferred from the claim text.