Coated styrene resin container and process for production thereo

Details Coated styrene resin container and process for production thereo Coated styrene resin container and process for production thereo

1988-09-22

1990-04-24

Seidleck, James

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

215 1C, 215 122, 427316, 427322, 428518, 428520, B65D 2308, B05D 300

Patent

active

049199854

DESCRIPTION:

BRIEF SUMMARY
TECHNOLOGICAL FIELD

This invention relates to a coated styrene resin container, and a process for its production. More specifically, it relates to a container obtained by providing a coating of a vinylidene chloride resin, which has excellent adhesion in the wet state, on a container of a styrene resin without any particular need for providing an anchor coat layer, and to a process for its production.


PRIOR ART

An aqueous latex of a vinylidene chloride resin is widely used for forming a coated layer on various packaging materials because it can form a coating having excellent resistance to permeation to various gases such as oxygen and water vapor. It is used, for example, as an inside or outside coating of a biaxially stretched polyester container.
Styrene resin containers, on the other hand, are widely used as handy packaging containers because they are cheap and easy to form. However, the styrene resins are among those resins which have highest gas permeability, and have an unsatisfactory ability to preserve goods therein. It is desired therefore to eliminate this problem.
It is naturally conceivable to improve the gas permeability resistance of a styrene resin container by providing a coating of a vinylidene chloride resin on the surface of the styrene resin container. Unexpectedly, such coated containers have not yet appeared on the packaging market. This is presumably because it is extremely difficult to coat a latex of the vinylidene chloride resin on the surface of the styrene resin container, and even when this coating of the latex is effected forcibly, adhesion of the coating to the container is extremely low.
U.S. Pat. No. 3,329,196 describes that a polymer or a copolymer of an alkyl methacrylate is formed as an anchor coat layer on a stretched molded article of polystyrene and coating a latex of a vinylidene chloride resin on the anchor coat layer.
However, the above method requires extra operations of coating a resin solution for the anchor coat and drying the anchor coat layer in addition to the coating of the vinylidene chloride resin. Inevitably, the number of steps increases and the cost of production becomes very high. Furthermore, since the styrene resin is one of those resins which are most easily soluble in various organic solvents. Marked restrictions are imposed on organic solvents which are used in forming the anchor coat, and the organic solvents exert undesirable influences on the styrene resin molded articles or the working environment.


SUMMARY OF THE INVENTION

It is an object of this invention to provide a coated styrene resin container in which a coated layer of a vinylidene chloride resin is firmly bonded to a container body of a styrene resin without an anchor coat layer.
Another object of this invention is to provide a coated styrene resin container in which the vinylidene resin coated layer has excellent peeling resistance, particularly at low temperatures in the wet state.
Still another object of this invention is to provide a process which can produce the above coated styrene resin container efficiently in lesser process steps without adverse effects of organic solvents.
According to this invention, there is provided a coated styrene resin container comprising a container body composed of a styrene resin and applied to at least one surface of the container body, a coated layer of a vinylidene chloride resin, the vinylidene chloride resin coated layer being composed of a copolymer containing 96 to 70 mole % of vinylidene chloride units, 3 to 30 mole % of vinyl chloride units and 3 to 20% of lower alkyl acrylate or methacrylate units based on the three components, and the coated layer being intimately bonded to the container body via a layer of an oxidation product of the styrene resin.
According to this invention, there is also provided a process for producing a coated styrene resin container, which comprises subjecting at least one surface of a container body composed of a styrene resin to an oxidation treatment so that the area ratio of oxygen peaks to carbon peak

REFERENCES:
patent: 3328196 (1967-06-01), Sincock
patent: 3922451 (1975-11-01), Anchutz et al.
patent: 4267202 (1981-05-01), Nakayama et al.
patent: 4370368 (1983-01-01), Hirata et al.
patent: 4393106 (1983-07-01), Maruhashi et al.
patent: 4436778 (1984-03-01), Dugal

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