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US 4,699,809 AGranted
Process for preparation of coated oriented plastic container
AssigneeToyo Seikan Kaisha, Ltd.
InventorsYoshitsugu Maruhashi, Isao Tanikawa, Sadao Hirata
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AssigneeToyo Seikan Kaisha, Ltd.
InventorsYoshitsugu Maruhashi, Isao Tanikawa, Sadao Hirata
Estimating the term…
Disclosed is a process for the preparation of a coated oriented plastic container, which comprises coating an aqueous latex or organic solvent solution of a vinylidene chloride copolymer on at least one surface of a parison, preform or sheet for formation of container which is formed by hot molding of a molecularly orientable thermoplastic resin, drying the coated parison, preform or sheet to form a coating layer, and subjecting the formed coated structure to draw molding such as biaxial draw blow molding or draw forming, wherein the coating layer of the vinylidene chloride copolymer is crystallized at the step of forming the coating layer or the draw molding step. In the coated oriented plastic container prepared according to this process, the adhesion of the coating layer of the vinylidene chloride copolymer to the plastic container substrate is highly improved, and even under severe conditions, peeling of the coating layer is prevented. Moreover, the gas barrier property, strength and chemical resistance of the container are prominently improved.
In a process for the preparation of a coated oriented plastic container by the steps of coating an aqueous latex or organic solvent solution of a vinylidene chloride copolymer on at least one surface of a preform for formation of a container, wherein said preform is formed by hot molding of a molecularly orientable thermoplastic resin, drying the coated preform to form a coating layer, and subjecting the formed coated structure to draw molding to form said container, the improvement comprising heat-treating the coating layer of the vinylidene chloride copolymer at the step of forming the coating layer or the draw molding step until the degree of crystallization of the vinylidene chloride copolymer is increased to at least 0.8 as measured according to the infrared absorption spectrum method, whereby the coating layer resists peeling off of said container at the draw molding step and when said container and any contents therein are subjected to freezing temperature.
A process for the preparation of a coated oriented plastic container, which comprises coating an aqueous latex or organic solvent solution of a vinylidene chloride copolymer on at least one surface of a sheet for formation of container, which is formed by hot molding of a molecularly orientable thermoplastic resin, drying the coated sheet to form a coating layer, and subjecting the formed coated structure to draw molding, and heat-treating the coating layer of the vinylidene chloride copolymer at the step of forming the coating layer or the draw molding step until the degree of crystallization is at least 0.5 as measured according to the infrared absorption spectrum method.
In a process for the preparation of a coated oriented plastic container by the steps of coating an aqueous latex or organic solvent solution of a vinylidene chloride copolymer on at least one surface of a sheet for formation of a container, said sheet being formed by hot molding of a molecularly orientable thermoplastic resin, drying the coated sheet to form a coating layer, and subjecting the formed coated structure to draw molding to form said container, the improvement comprising heat-treating the coating layer of the vinylidene chloride copolymer at the step of forming the coating layer or the draw molding step until the degree of crystallization of the vinylidene chloride copolymer is increased to at least 0.8 as measured according to the infrared absorption spectrum method, whereby the coating layer resists peeling off of said container at the draw molding step and when said container and any contents therein are subjected to freezing temperatures.
Dependencies are inferred from the claim text.