초록 ▼

A plastic bottle has as a wall-forming component a layer of a copolymer consisting essentially of 99 to 70% by weight of vinylidene cloride and 1 to 40% by weight of at least one acrylic or methacrylic monomer and further including up to 100 parts by weight of at least one member selected from other

A plastic bottle has as a wall-forming component a layer of a copolymer consisting essentially of 99 to 70% by weight of vinylidene cloride and 1 to 40% by weight of at least one acrylic or methacrylic monomer and further including up to 100 parts by weight of at least one member selected from other ethylenically unsaturated monomers per 100 parts by weight of the total amount of the first two monomers, the copolymer having an oxygen permeability constant of less than 9×10-14 ccㆍcm/cm2ㆍsecㆍcmHg as measured at a temperature of 20°C. and a relative humidity of 100% and a water vapor permeability constant of less than 3×10-3 gㆍcm/m2ㆍday as determined according to the method of JIS Z-0208. This plastic bottle is obtained by casting an aqueous latex or the like of the above-mentioned copolymer in a bottle mold and drying the cast latex. This aqueous latex may be formed as a coating layer on a preformed plastic bottle. In this plastic bottle, the humidity dependency of the oxygen barrier property is prominently reduced.

대표청구항 ▼

A process for the preparation of coated plastic bottles which excel in both oxygen-barrier property and water resistance, which comprises coating at least one surface of a plastic bottle-forming parison, preform or sheet formed of a thermoplastic resin by melt molding with an aqueous latex of a copo

A process for the preparation of coated plastic bottles which excel in both oxygen-barrier property and water resistance, which comprises coating at least one surface of a plastic bottle-forming parison, preform or sheet formed of a thermoplastic resin by melt molding with an aqueous latex of a copolymer consisting essentially of 99 to 70% by weight of vinylidene chloride and 1 to 30% by weight of at least one acrylic or methacrylic monomer and further including up to 100 parts by weight of at least one member selected from other ethylenically unsaturated monomers per 100 parts by weight of the total amount of said two monomers, said copolymer having an oxygen permeability constant of less than 9×10-14 ccㆍcm/cm2ㆍsecㆍcmHg as measured at a temperature of 20°C. and a relative humidity of 100% and a water vapor permeability constant of less than 3×1013 gㆍcm/m2ㆍday as determined according to the method of JIS Z-0208, drying the coated parison, preform or sheet to form a coating layer, subjecting the so-formed coated structure to biaxially drawing blow molding or deep forming to introduce monoaxial or biaxial orientation in said plastic substrate, and then increasing the oxygen-barrier property and water resistance of the coated plastic bottle by subjecting the resultant bottle to aging at a temperature of 30°to 120°C. for 30 seconds to 7 days.