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Organic-resin-coated metal sheet, process for producing same, metallic can obtained by processing said organic-resin-coated metal sheet, and can lid
US2016145462A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016145462-A1 |
| Application number | US-201414907266-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jul 18, 2014 |
| Priority date | Jul 22, 2013 |
| Publication date | May 26, 2016 |
| Grant date | — |
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- Title
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Abstract
Official abstract text for this publication.
An object of the present invention is to provide an organic-resin-coated metal sheet for beverages and foods having retort blushing resistance and can manufacturability, a manufacturing method thereof, and a metal can and a can lid that are made by processing the organic-resin-coated metal sheet. An organic-resin-coated metal sheet of the present invention is an organic-resin-coated metal sheet in which an unstretched film is stacked on at least a single surface of a metal sheet, and is characterized in that the unstretched film is composed of a polyester-based resin composition obtained by blending copolymerized polyester (I) composed mainly of a polyethylene terephthalate-based resin with crystalline polyester (II) composed mainly of a polybutylene terephthalate-based resin with a mixing amount of the crystalline polyester (II) of 20 to 45 wt %.
First claim
Opening claim text (preview).
1 . An organic-resin-coated metal sheet in which an unstretched film is stacked on at least a single surface of a metal sheet, the organic-resin-coated metal sheet being characterized in that the unstretched film is composed of a polyester-based resin composition obtained by blending copolymerized polyester (I) composed mainly of a polyethylene terephthalate-based resin with crystalline polyester (II) composed mainly of a polybutylene terephthalate-based resin with a mixing amount of the crystalline polyester (II) of 20 to 45 wt %. 2 . The organic-resin-coated metal sheet according to claim 1 , characterized in that the crystalline polyester (II) composed mainly of the polybutylene terephthalate-based resin is homopolyester. 3 . The organic-resin-coated metal sheet according to claim 1 , characterized in that a height H of a recrystallization peak in a temperature decrease in differential scanning calorimetry (DSC) of the unstretched film stacked on at least the single surface of the metal sheet is in a range of 0.8 mW≦H<2.0 mW. 4 . The organic-resin-coated metal sheet according to claim 1 , characterized in that a recrystallization peak in a temperature decrease in differential scanning calorimetry (DSC) of the unstretched film stacked on at least the single surface of the metal sheet has one peak. 5 . The organic-resin-coated metal sheet according to claim 1 , characterized in that the unstretched film composed of the polyester-based resin composition is a film formed by an extrusion coating method in which the unstretched film is extruded into a thin film shape through a die head of an extruder and is pressure-bonded and thermally bonded to the metal sheet by a laminating roll. 6 . The organic-resin-coated metal sheet according to claim 1 , characterized in that a thickness of the unstretched film composed of the polyester-based resin composition is 5 to 15 μm. 7 . A metal can characterized by being made by processing the organic-resin-coated metal sheet according to claim 1 . 8 . A can lid characterized by being made by processing the organic-resin-coated metal sheet according to claim 1 . 9 . A manufacturing method of an organic-resin-coated metal sheet in which a polyester-based resin composition obtained by blending copolymerized polyester (I) composed mainly of a polyethylene terephthalate-based resin with crystalline polyester (II) composed mainly of a polybutylene terephthalate-based resin is stacked on at least a single surface of a metal sheet by an extrusion coating method, the manufacturing method being characterized in that a mixing amount of the crystalline polyester (II) is set to 20 to 45 wt % in the resin composition, and an unstretched film extruded through a die head of an extruder is pressure-bonded and thermally bonded to at least the single surface of the metal sheet by a laminating roll under conditions in which a kneading temperature in the extruder is 255° C.≦kneading temperature <295° C., a ratio of “a discharge amount in the extruder/rotation speed of an extruder screw” is 0.8<Q/N, where Q=the discharge amount in the extruder (kg/h) N=the rotation speed of the extruder screw (rpm), and a residence time in the extruder is 5 to 20 minutes. 10 . The manufacturing method of an organic-resin-coated metal sheet according to claim 9 , characterized in that heat treatment under a following condition is performed in any step that is after stacking of the polyester-based resin composition on the metal sheet through the die head of the extruder and before execution of retort sterilization treatment, where the condition is: a combination condition of a heat treatment temperature (° C.) and a heat treatment time (seconds) indicated by coordinates (heat treatment temperature, heat treatment time) in a region formed by sequentially linking A (80° C., 120 seconds), B (60° C., 600 seconds), C (220° C., 600 seconds), D (220° C., 30 seconds), E (120° C., 30 seconds), F (100° C., 60 seconds), and A (80° C., 120 seconds) by straight lines in coordinates in a graph in which an abscissa is defined as the heat treatment temperature and an ordinate is defined as the heat treatment time. 11 . The organic-resin-coated metal sheet according to claim 2 , characterized in that a height H of a recrystallization peak in a temperature decrease in differential scanning calorimetry (DSC) of the unstretched film stacked on at least the single surface of the metal sheet is in a range of 0.8 mW≦H<2.0 mW. 12 . The organic-resin-coated metal sheet according to claim 2 , characterized in that a recrystallization peak in a temperature decrease in differential scanning calorimetry (DSC) of the unstretched film stacked on at least the single surface of the metal sheet has one peak. 13 . The organic-resin-coated metal sheet according to claim 3 , characterized in that a recrystallization peak in a temperature decrease in differential scanning calorimetry (DSC) of the unstretched film stacked on at least the single surface of the metal sheet has one peak. 14 . The organic-resin-coated metal sheet according to claim 11 , characterized in that a recrystallization peak in a temperature decrease in differential scanning calorimetry (DSC) of the unstretched film stacked on at least the single surface of the metal sheet has one peak. 15 . The organic-resin-coated metal sheet according to claim 2 , characterized in that the unstretched film composed of the polyester-based resin composition is a film formed by an extrusion coating method in which the unstretched film is extruded into a thin film shape through a die head of an extruder and is pressure-bonded and thermally bonded to the metal sheet by a laminating roll. 16 . The organic-resin-coated metal sheet according to claim 3 , characterized in that the unstretched film composed of the polyester-based resin composition is a film formed by an extrusion coating method in which the unstretched film is extruded into a thin film shape through a die head of an extruder and is pressure-bonded and thermally bonded to the metal sheet by a laminating roll. 17 . The organic-resin-coated metal sheet according to claim 4 , characterized in that the unstretched film composed of the polyester-based resin composition is a film formed by an extrusion coating method in which the unstretched film is extruded into a thin film shape through a die head of an extruder and is pressure-bonded and thermally bonded to the metal sheet by a laminating roll. 18 . The organic-resin-coated metal sheet according to claim 2 , characterized in that a thickness of the unstretched film composed of the polyester-based resin composition is 5 to 15 μm. 19 . The organic-resin-coated metal sheet according to claim 3 , characterized in that a thickness of the unstretched film composed of the polyester-based resin composition is 5 to 15 μm. 20 . The organic-resin-coated metal sheet according to claim 4 , characterized in that a thickness of the unstretched film composed of the polyester-based resin composition is 5 to 15 μm.
Assignees
Inventors
Classifications
at least one layer is extruded and immediately laminated while in semi-molten state · CPC title
Flow or feed rate · CPC title
combined with joining, lining or laminating · CPC title
Polyesters, e.g. PET, i.e. polyethylene terephthalate · CPC title
Containers; Receptacles · CPC title
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2016145462A1 cover?
- An object of the present invention is to provide an organic-resin-coated metal sheet for beverages and foods having retort blushing resistance and can manufacturability, a manufacturing method thereof, and a metal can and a can lid that are made by processing the organic-resin-coated metal sheet. An organic-resin-coated metal sheet of the present invention is an organic-resin-coated metal sheet…
- Who is the assignee on this patent?
- Toyo Seikan Group Holdings Ltd, Toyo Seikan Kaisha Ltd
- What technology area does this patent fall under?
- Primary CPC classification C09D167/02. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu May 26 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).