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US 4,370,368 AGranted
Plastic bottles and process for preparation thereof
AssigneeToyo Seikan Kaisha, Ltd.
InventorsSadao Hirata, Isao Tanikawa, Yoshitsugu Maruhashi
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AssigneeToyo Seikan Kaisha, Ltd.
InventorsSadao Hirata, Isao Tanikawa, Yoshitsugu Maruhashi
Estimating the term…
A plastic bottle has as a wall-forming component a layer of a copolymer consisting essentially of 99 to 70% by weight of vinylidene chloride 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.times.10.sup.-14 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg as measured at a temperature of 20.degree. C. and a relative humidity of 100% and a water vapor permeability constant of less than 3.times.10.sup.-3 g.multidot.cm/m.sup.2 .multidot.day 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.
A molded plastic bottle the walls of which are molded from a wall-forming component consisting essentially 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.times.10.sup.-14 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg as measured at a temperature of 20.degree. C. and a relative humidity of 100% and a water vapor permeability constant of less than 3.times.10.sup.-3 g.multidot.cm/m.sup.2 .multidot.day as determined according to the method of JIS Z-0208.
A plastic bottle comprising a plastic bottle substrate formed of a melt-moldable thermoplastic resin and a coating layer formed on at least one surface of said plastic bottle substrate, said coating layer being formed 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.times.10.sup.-14 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg as measured at a temperature of 20.degree. C. and a relative humidity of 100% and a water vapor permeability constant of less than 3.times.10.sup.-3 g.multidot.cm/m.sup.2 .multidot.day as determined according to the method of JIS Z-0208, said coating being obtained by coating the surface of the substrate with an aqueous latex of said copolymer, drying said latex coating and aging the coated structure at a temperature of 30.degree. to 120.degree. C. for 30 seconds to 7 days after drying.
A process for the preparation of plastic bottles which comprises casting 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 in a bottle mold, partially drying the cast latex to such an extent that the partially dried copolymer has a form-retaining property, removing the partially dried copolymer from said mold and drying the partially dried copolymer to integrally mold the copolymer to a bottle, and after drying the coating, subjecting the coated structure to aging at a temperature of 30.degree. to 120.degree. C. for 30 seconds to 7 days.
A process for the preparation of coated plastic bottles which comprises coating at least one surface of a plastic bottle formed by melt molding of a thermoplastic resin 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, and drying the so-formed coating, and after drying the coating, subjecting the coated structure to aging at a temperature of 30.degree. to 120.degree. C. for 30 seconds to 7 days.
Dependencies are inferred from the claim text.