WO2022131246A1 - 多層樹脂シート、及びそれを成形してなる成形容器 - Google Patents
多層樹脂シート、及びそれを成形してなる成形容器 Download PDFInfo
- Publication number
- WO2022131246A1 WO2022131246A1 PCT/JP2021/046021 JP2021046021W WO2022131246A1 WO 2022131246 A1 WO2022131246 A1 WO 2022131246A1 JP 2021046021 W JP2021046021 W JP 2021046021W WO 2022131246 A1 WO2022131246 A1 WO 2022131246A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- styrene
- resin layer
- resin
- layer
- mass
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
- B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
- B65D1/30—Groups of containers joined together end-to-end or side-by-side
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/06—Polystyrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
Definitions
- the present invention relates to a multilayer resin sheet and a molded container formed by molding the multi-layer resin sheet.
- styrene-based resin and polyolefin-based resin have been used as containers for soft drinks, fruit juice drinks, favorite foods and drinks, and the like.
- a multilayer resin sheet in which an ethylene-vinyl alcohol copolymer resin layer is provided on the resin via an adhesive layer such as a modified olefin resin to impart oxygen barrier properties and suppress deterioration in quality due to oxidation of the contents.
- multi-layer containers made of the same are widely used (Patent Documents 1 to 3).
- Patent Document 1 proposes a multilayer resin sheet that prevents the occurrence of hotdish adhesion during container molding by adjusting the surface roughness of the polystyrene resin layer.
- Patent Document 2 proposes a multilayer resin sheet having transparency, rigidity, and oxygen barrier property by using a transparent styrene resin.
- Patent Document 3 the olefin resin layer, the gas barrier resin layer, and the resin composition layer composed of the styrene resin, the styrene-diene copolymer, and the olefin resin are combined in a specific order. Multilayer resin sheets having gas barrier properties, moldability, and rigidity have been proposed.
- the multilayer resin sheet described in Patent Documents 1 and 2 is not applicable to the container because it breaks when bent at the notch portion. Further, the multilayer resin sheet described in Patent Document 3 has poor moldability of polypropylene as a base material layer, and cannot be applied to a container having a complicated shape such as the above-mentioned container.
- the present invention has been made in view of the above circumstances, and it is easy to impart notch bendability after thermoforming while having thermoformability, rigidity, and oxygen barrier properties, and a design after filling the contents. It is an object of the present invention to provide a multilayer resin sheet that can be molded into a deeply drawn container having excellent properties and visibility, and a molded container formed by molding the multilayer resin sheet.
- the present inventor has styrene-based via a modified olefin-based polymer layer on both sides of the oxygen barrier resin layer.
- the styrene-based resin layer on at least one surface side thereof is formed of a specific styrene-based resin, and the styrene-based resin layer on one surface side and the other surface side is formed.
- the present invention that solves the above problems is composed of the following.
- the total thickness of the sheet is 500 to 1200 ⁇ m
- the thickness of the styrene-based resin layer C is 10 to 35% of the total thickness
- the thickness of the styrene-based resin layer D is 10 to 35% of the total thickness.
- the surface roughness (Ra) of the styrene resin layers C and D which is 50 to 80% of the thickness and is opposite to the surface facing the modified olefin polymer layers A and B, is 0.
- the styrene-based resin layer D is 1 to 2.0 ⁇ m, and the styrene-based resin layer D is 0.5 to 5% by mass of a styrene-conjugated diene block copolymer and 0.5 to 5% by mass of a conjugated diene-based rubber graft-polymerized with a styrene monomer.
- % A multilayer resin sheet containing 30 to 85% by mass of polystyrene.
- thermoforming property thermoforming property
- rigidity rigidity
- oxygen barrier property which can impart notch bendability after thermoforming.
- a deep-drawn molded container having excellent design and visibility is provided.
- the multilayer resin sheet according to the embodiment of the present invention has the oxygen barrier resin layer and the oxygen barrier resin layer on both sides via the modified olefin polymer layers A and B, respectively.
- It is a multilayer resin sheet containing laminated styrene resin layers C and D, and the total thickness is 500 to 1200 ⁇ m, and the thickness of the styrene resin layer C is 10 to 35 of the total thickness.
- the thickness of the styrene-based resin layer D is 50 to 80% of the total thickness, and the surfaces of the styrene-based resin layers C and D facing the modified olefin-based polymer layers A and B.
- the surface roughness (Ra) of the surface opposite to the above is 0.1 to 2.0 ⁇ m, and the styrene-based resin layer D contains 15 to 70% by mass of the styrene-conjugated diene block copolymer and styrene alone. It is a multilayer resin sheet characterized by containing 30 to 85% by mass of styrene containing 0.5 to 5% by mass of a conjugated diene rubber having a polymer graft-polymerized.
- the oxygen barrier resin layer mainly contains an oxygen barrier resin such as an ethylene-vinyl alcohol copolymer resin and a polyamide resin. Among them, it is preferable to contain an ethylene-vinyl alcohol copolymer resin in terms of processability and moldability.
- "mainly contained” means that the resin is contained in an amount of 50% by mass or more. In other embodiments, it may be contained in an amount of 70% by mass or more, 90% by mass or more, or may be composed of only the resin thereof.
- the ethylene-vinyl alcohol copolymer resin is usually obtained by saponifying an ethylene-vinyl acetate copolymer.
- the ethylene content is preferably 10 to 65 mol%, more preferably 20 to 50 mol%, still more preferably 25 to 40%, in order to provide oxygen barrier property, processability and moldability.
- the degree of saponification is preferably 90% or more, more preferably 95% or more, and even more preferably 97% or more.
- the ethylene content in the ethylene-vinyl alcohol copolymer resin can be calculated, for example, by nuclear magnetic resonance spectroscopy (NMR).
- polyamide resin examples include lactam polymers such as caprolactam and laurolactam, polymers of aminocarboxylic acids such as 6-aminocaproic acid, 11-aminoundecanoic acid and 12-aminododecanoic acid, hexamethylenediamine and decamethylenediamine.
- Dodecamethylenediamine aliphatic diamines such as 2,2,4- or 2,4,4-trimethylhexamethylenediamine, 1,3- or 1,4-bis (aminomethyl) cyclohexane, bis (p-aminocyclohexyl) Alicyclic diamines such as methane, diamine units such as aromatic diamines such as m- or p-xylylenediamine, aliphatic dicarboxylic acids such as adipic acid, suberic acid and sebacic acid, and alicyclic acids such as cyclohexanedicarboxylic acid.
- Examples thereof include a polycondensate with a dicarboxylic acid unit such as an aromatic dicarboxylic acid such as a dicarboxylic acid, a terephthalic acid, and an isophthalic acid, and a copolymer thereof.
- a dicarboxylic acid unit such as an aromatic dicarboxylic acid such as a dicarboxylic acid, a terephthalic acid, and an isophthalic acid, and a copolymer thereof.
- Specific polyamide resins include nylon 6, nylon 9, nylon 11, nylon 12, nylon 66, nylon 610, nylon 611, nylon 612, nylon 6T, nylon 6I, nylon MXD6, nylon 6/66, and nylon 6/610. , Nylon 6 / 6T, Nylon 6I / 6T, etc., among which nylon 6 and nylon MXD6 are preferable.
- the thickness of the oxygen barrier resin layer is preferably 10 to 50 ⁇ m, more preferably 20 to 40 ⁇ m, and even more preferably 30 to 40 ⁇ m. If it is 10 ⁇ m or more, sufficient oxygen barrier performance can be obtained to suppress deterioration of quality due to oxidation of the contents of the molded container, and if it is 50 ⁇ m or less, resin whiskers are sufficiently generated when the thermoformed container is punched. Can be suppressed.
- the ratio of the thickness of the oxygen barrier layer to the thickness of the entire multilayer resin sheet described later is preferably 0.5 to 15%, more preferably 1 to 10%, still more preferably 2 to 8%.
- the modified olefin polymer layers A and B are homopolymers of olefins having about 2 to 8 carbon atoms such as ethylene, propylene, and butene-1, and the olefins and ethylene, propylene, butene-1,3-methylbutene-1. , Penten-1, 4-methylpentene-1, hexene-1, octene-1, decene-1, and other olefins having about 2 to 20 carbon atoms, vinyl acetate, vinyl chloride, acrylic acid, methacrylic acid, acrylic acid.
- Olefin resins such as esters, methacrylic acid esters, copolymers with vinyl compounds such as styrene, ethylene-propylene copolymers, ethylene-propylene-diene copolymers, ethylene-butene-1 copolymers, propylene-
- An olefin-based rubber such as a butene-1 copolymer may be an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, or tetrahydrophthalic acid, or an unsaturated carboxylic acid thereof.
- the modified olefin polymer constituting the modified olefin polymer layer A may be the same as or different from the modified olefin polymer constituting the modified olefin polymer layer B.
- modified olefin polymer unsaturated dicarboxylic acid or an anhydride thereof, particularly ethylene resin modified with maleic acid or an anhydride thereof, propylene resin, or ethylene-propylene or butene-1 copolymer rubber is preferable. Used for.
- the thicknesses of the modified olefin polymer layers A and B are preferably 10 to 50 ⁇ m, more preferably 20 to 40 ⁇ m, and even more preferably 20 to 25 ⁇ m, respectively. When it is 10 ⁇ m or more, sufficient interlayer adhesion strength can be obtained, and when it is 50 ⁇ m or less, the generation of resin whiskers can be sufficiently suppressed at the time of punching of the thermoformed container.
- the thickness of the modified olefin polymer layer A may be the same as or different from the thickness of the modified olefin polymer layer B.
- the ratio of the thicknesses of the modified olefin polymer layers A and B to the thickness of the entire multilayer resin sheet described later is preferably 0.5 to 15%, more preferably 1 to 10%, and 1.5 to 4%, respectively. More preferred.
- the styrene-based resin layer C is, for example, a styrene-based polymer such as styrene, ⁇ -methylstyrene, p-methylstyrene, dimethylstyrene, pt-butylstyrene, and chlorostyrene, as long as the effects of the present invention are not impaired.
- AS resin styrene-acrylic nitrile copolymer
- styrene-based resin selected from styrene-based resins such as sex polystyrene (HIPS resin) and styrene-acrylic nitrile graft polymer (ABS resin).
- HIPS resin sex polystyrene
- ABS resin styrene-acrylic nitrile graft polymer
- the styrene-based resin can be used alone or in combination as the styrene-based resin layer. Further, the styrene-based resin used for the styrene-based resin layer D described later may be used.
- the thickness of the styrene-based resin layer C is preferably 10 to 35%, more preferably 15 to 30%, and even more preferably 20 to 25% of the thickness of the entire multilayer resin sheet described later. If it is 10% or more, the styrene resin layer C is cut off during container molding and the modified olefin polymer layer is exposed, so that there is no problem that the appearance of the container is impaired. Further, if it is less than 35%, the resistance when bending the container at the notch portion becomes large, and there is no problem that the bending property is lowered.
- the thickness of the styrene resin layer C is preferably 50 to 420 ⁇ m, more preferably 70 to 260 ⁇ m, and even more preferably 150 to 200 ⁇ m.
- the surface roughness (Ra) of the surface of the styrene resin layer C opposite to the surface facing the modified olefin polymer layer A is preferably 0.1 to 2.0 ⁇ m. 0.1 to 1.0 ⁇ m is more preferable, and 0.3 to 0.7 ⁇ m is even more preferable. If it is 0.1 ⁇ m or more, the resin layer will not be fused to the heat source during heat molding, and if it is 2.0 ⁇ m or less, the transparency and surface gloss of the obtained molded product will be lost, and the product There is no problem of degrading the value.
- the styrene-based resin layer D contains 30 to 85% by mass of a styrene-conjugated diene block copolymer and 0.5 to 5% by mass of a conjugated diene-based rubber graft-polymerized with a styrene monomer. It contains a styrene-based resin containing. In one embodiment, the styrene-based resin layer D may contain 40 to 60% by mass or 45 to 55% by mass of the styrene-conjugated diene block copolymer.
- the styrene-based resin layer D may contain 40 to 60% by mass or 45 to 55% by mass of polystyrene containing 0.5 to 5% by mass of the conjugated diene-based rubber graft-polymerized with the styrene monomer. ..
- the styrene-conjugated diene block copolymer is a polymer containing a polymer block mainly composed of a styrene-based monomer and a polymer block mainly composed of a conjugated diene monomer in its structure.
- Styrene-based monomers include styrene, o-methylstyrene, p-methylstyrene, p-tert-butylstyrene, 1,3-dimethylstyrene, ⁇ -methylstyrene, vinylnaphthalene, vinylanthracene, and 1,1-diphenylethylene. And so on.
- styrene is the main component, but one or more of the above-mentioned other components may be contained as trace components.
- the conjugated diene monomer is a compound having a conjugated double bond in its structure, for example, 1,3-butadiene (butadiene), 2-methyl-1,3-butadiene (isoprene), 2,3-dimethyl.
- 1,3-butadiene 1,3-pentadiene, 1,3-hexadiene, 2-methylpentadiene and the like, and among them, butadiene and isoprene are preferably used.
- two or more kinds of conjugated diene monomers may be used.
- the polymer block mainly composed of a styrene-based monomer may be a polymer block having only a structure derived from the styrene-based monomer, and the structure derived from the styrene-based monomer may be 50% by mass or more. , 70% by mass or more, or 90% by mass or more may be a polymer block.
- the polymer block mainly composed of the conjugated diene monomer may be a polymer block having only a structure derived from the conjugated diene monomer, and the structure derived from the conjugated diene monomer may be 50% by mass or more. , 70% by mass or more, or 90% by mass or more may be a polymer block.
- the conjugated diene content of the styrene-conjugated diene block copolymer is preferably 10 to 40% by mass with respect to all the monomer units of the styrene-conjugated diene block copolymer from the viewpoint of the mechanical properties of the sheet. It is more preferably 15 to 35% by mass, still more preferably 20 to 30% by mass.
- the conjugated diene content means the ratio of the mass of the structure derived from the conjugated diene monomer to the styrene-conjugated diene block copolymer.
- the conjugated diene content of the styrene-conjugated diene block copolymer can be calculated by, for example, analyzing with a Fourier transform infrared spectrophotometer (FT-IR) or the like.
- FT-IR Fourier transform infrared spectrophotometer
- styrene-conjugated diene block copolymers are used.
- the styrene-conjugated diene block copolymer is, for example, a binary copolymer of styrene-butadiene (SB) and a ternary copolymer of styrene-butadiene-styrene (SBS) (SBS) when the conjugated diene is butadiene.
- SB binary copolymer of styrene-butadiene
- SBS ternary copolymer of styrene-butadiene-styrene
- SBS ternary copolymer of styrene-butadiene-styrene
- the styrene-conjugated diene block copolymer can be produced by a conventionally known polymerization method such as emulsion polymerization or solution polymerization, and a commercially available product can be used as it is.
- Styrene containing a conjugated diene-based rubber (hereinafter, also referred to as “graft rubber”) graft-polymerized with a styrene monomer is obtained by polymerizing a styrene monomer in the presence of a conjugated diene-based rubber polymer. It is a so-called impact-resistant polystyrene (HIPS) in which fine-grained rubber components graft-polymerized with a styrene monomer are dispersed in an island shape in a resin phase made of polystyrene.
- HIPS impact-resistant polystyrene
- the styrene monomer is o-methylstyrene, p-methylstyrene, p-tert-butylstyrene, 1,3-dimethylstyrene, ⁇ -methylstyrene, vinylnaphthalene, as long as the effect of the present invention is not impaired. It may contain one or more aromatic vinyl compounds such as vinyl anthracene and 1,1-diphenylethylene.
- conjugated diene-based rubber polymer examples include 1,3-butadiene (butadiene), 2-methyl-1,3-butadiene (isoprene), 2,3-dimethyl-1,3-butadiene, and 1,3-pentadiene. , 1,3-Hexadiene, 2-methylpentadiene and the like as a monomer are conjugated diene-based rubbers. Further, a thermoplastic elastomer such as a styrene-conjugated diene block copolymer having a conjugated diene component of 50% by mass or more can also be used. Of these, polybutadiene and styrene-butadiene block copolymers are preferable.
- Polystyrene contains 0.5 to 5% by mass, preferably 0.5 to 3.0% by mass, and more preferably 1.0 to 2.5% by mass of graft rubber.
- content of the graft rubber is 0.5% by mass or more, blocking in which the sheets stick to each other can be sufficiently suppressed, and when it is 5% by mass or less, the transparency of the container can be sufficiently ensured. ..
- the content of the graft rubber with respect to the total styrene resin used in the styrene resin layer is preferably 0.3 to 3% by mass, more preferably 0.3 to 2.5% by mass, and 0.5 to 2.0% by mass. % Is more preferable.
- the content of graft rubber in polystyrene can be adjusted at the manufacturing stage of HIPS, but HIPS in which the content of graft rubber is higher than the target content is prepared in advance, and polystyrene (general-purpose polystyrene, GPPS) is prepared. It is a simple method to adjust by blending.
- GPPS generally means a homopolymer of a styrene monomer, but as a monomer other than styrene as long as it does not impair the effect of the present invention, for example, o-methylstyrene, p-methylstyrene, p- It may contain one or more aromatic vinyl compounds such as tert-butyl styrene, 1,3-dimethyl styrene, ⁇ -methyl styrene, vinyl naphthalene, vinyl anthracene and 1,1-diphenylethylene.
- iodine monochloride / carbon tetrachloride solution dissolve HIPS in chloroform, add a certain amount of iodine monochloride / carbon tetrachloride solution, leave it in the dark for about 1 hour, add potassium iodide solution, and add excess iodine monochloride.
- the particle size of the graft rubber is preferably 1.0 ⁇ m or more and 3.0 ⁇ m or less, more preferably 1.0 ⁇ m or more and 2.8 ⁇ m or less, and further preferably 1.0 ⁇ m or more and 2.5 ⁇ m or less. preferable.
- the particle size of the graft rubber referred to here means the average particle size of the graft rubber content measured by the laser diffraction type particle analyzer.
- the thickness of the styrene resin layer D is 50 to 80%, preferably 60 to 80%, and more preferably 70 to 75% of the thickness of the entire sheet described later. If it is 50% or more, the styrene resin layer D is cut off during the notch processing and the modified olefin polymer layer is exposed, so that there is no problem that the appearance of the container is spoiled. Further, if it is 80% or less, the resistance when bending the container at the notch portion becomes large, and there is no problem that the bending property is lowered.
- the oxygen barrier performance can be improved by increasing the thickness of the oxygen barrier resin layer, or the styrene resin layer C can be formed during container molding by increasing the relative thickness of the styrene resin layer C. It is possible to prevent the problem that the modified olefin polymer layer is cut and the modified olefin polymer layer is exposed and the appearance of the container is spoiled.
- the thickness of the styrene resin layer D is preferably 250 to 850 ⁇ m, more preferably 340 to 750 ⁇ m, and even more preferably 500 to 580 ⁇ m.
- the surface roughness (Ra) of the surface of the styrene resin layer D opposite to the surface facing the modified olefin polymer layer B is 0.1 to 2.0 ⁇ m. It is preferably 0.1 to 1.0 ⁇ m, more preferably 0.3 to 0.7 ⁇ m. If it is 0.1 ⁇ m or more, the resin layer will not be fused to the heat source during heat molding, and if it is 2.0 ⁇ m or less, the transparency and surface gloss of the obtained molded product will be lost, and the product There is no problem of degrading the value.
- the multilayer resin sheet of the present embodiment can be used for deep drawing molding.
- “for deep drawing” means having characteristics suitable for deep drawing
- “deep drawing” means the depth and width of the forming container (plural) regardless of the shape of the forming container. It is defined that the aperture ratio, which is the ratio of the maximum width in a shape with a width), is 0.5 or more.
- the deep drawn container here is a container having a drawing ratio of 0.5 or more, preferably 0.9 or more, more preferably 1 or more, and most preferably 1.5 or more.
- the multilayer resin sheet of the present embodiment can also be used for forming a notch.
- "for notch forming” means that it has characteristics suitable for forming a notch, and when forming a notch and repeatedly bending it to the side opposite to the surface on which the notch is made, by hand. It is defined as being easily bent and not cracking even if it is bent 5 times or more.
- the depth of the notch to be formed is not particularly limited as long as it can be easily bent by hand, but can be, for example, 100 to 400 ⁇ m, preferably 150 to 350 ⁇ m, and more preferably 200 to 300 ⁇ m.
- the styrene resin layer D 15 to 70% by mass of the styrene-conjugated diene block copolymer and 0.5 to 5% by mass of the conjugated diene rubber graft-polymerized with the styrene monomer are used.
- a styrene-based resin containing 85 to 30% by mass of polystyrene containing% all of transparency, rigidity, and notch bendability can be satisfied, and the wall thickness of the molded container becomes thicker when deep drawing is performed.
- a sheet can be obtained in which problems such as a bias toward the bottom surface and a decrease in the strength of the container are suppressed.
- the styrene resin layer D is arranged on the side on which the notch is formed.
- the styrene resin layer C is arranged on the surface side where the notch is not formed.
- the overall thickness of the multilayer resin sheet of the present embodiment is preferably 500 to 1200 ⁇ m, more preferably 700 to 1000 ⁇ m, and even more preferably 800 to 900 ⁇ m.
- 500 ⁇ m or more sufficient strength of the container obtained by thermoforming can be obtained, and when it is 1200 ⁇ m or less, the manufacturing cost of the container can be suppressed.
- the method for producing the multilayer resin sheet of the present embodiment is not particularly limited, and a general method can be used. For example, a method of melt-extruding each raw material resin using three or more single-screw extruders to obtain a multi-layer resin sheet by a feed block and a T-die, or a method of obtaining a multi-layer resin sheet by using a multi-manifold die. Can be mentioned.
- the method for imparting a predetermined surface roughness to both surfaces of the multilayer resin sheet of the present embodiment is not particularly limited, and a general method can be used.
- a general method can be used.
- picking up the molten resin there is a method of picking it up with a roll or a belt that has been subjected to uneven processing.
- the molded container according to the second embodiment of the present invention is a molded container formed by thermally forming a multilayer resin sheet according to the first embodiment and having a notch formed on one surface.
- the molded container of the present embodiment is formed by thermoforming the multilayer resin sheet of the first embodiment.
- 2 and 3 show an example of a molded container according to an embodiment of the present invention.
- Thermoforming methods include general vacuum forming and compressed air forming, as an application of these, a plug assist method in which a plug is brought into contact with one side of a sheet for forming, and a pair of male and female molds on both sides of the sheet. Examples thereof include, but are not limited to, a so-called match mold molding method in which molding is performed by contacting them.
- a known sheet heating method such as radiant heating by an infrared heater or the like which is non-contact heating can be applied.
- the molding temperature at the time of thermoforming is appropriately set in consideration of the melting point of the resin and the like, but when deep drawing molding with a drawing ratio of 0.5 or more is performed using the multilayer resin sheet according to the first embodiment.
- the hot plate temperature is set to 170 ° C. or higher, preferably 175 to 180 ° C. If the hotdish temperature is less than 170 ° C., the shaping state of the container is insufficient due to insufficient heating, and if it is too high, problems such as fusion to the hotdish may occur, which is not preferable.
- the molded container of the present invention has a notch.
- the notch has a V-shaped cross section, and can be formed by inserting a V-shaped blade by heating by a hot disk method or the like on one surface side, that is, the styrene resin layer D side.
- the resin raw materials used in Examples and Comparative Examples are as follows. (1) Oxygen barrier resin layer Ethylene-vinyl alcohol copolymer "EVAL J-171B" (manufactured by Kuraray, ethylene content 32 mol%, saponification degree 99% or more) (2) Modified olefin polymer layer "Modic F502" (manufactured by Mitsubishi Chemical Corporation) (3) Styrene-based resin layer Impact-resistant polystyrene resin: "Toyo Styrene H870" (manufactured by Toyo Styrene Co., Ltd., graft rubber content 8.6% by mass, graft rubber particle diameter 2.5 ⁇ m) Polystyrene resin: "HRM23” (manufactured by Toyo Styrene Co., Ltd.) Styrene-conjugated diene block copolymer: "730L” (manufactured by Denka, conjugated diene content 25% by mass)
- Example 1 A feed block using two 40 mm single-screw extruders for the oxygen barrier resin layer and the modified olefin polymer layers A and B and one 65 mm single-screw extruder for the styrene resin layers C and D. According to the method, it has a layer structure of styrene resin layer C 160 ⁇ m / modified olefin polymer layer A 20 ⁇ m / oxygen barrier resin layer 30 ⁇ m / modified olefin polymer layer B 20 ⁇ m / styrene resin layer D 570 ⁇ m, and the total thickness is 800 ⁇ m. A multilayer resin sheet was obtained.
- a metal roll having an uneven surface roughness (Ra) of 0.5 ⁇ m is used as a take-up roll (touch roll and cast roll), and the surface on the styrene resin layer C side is on the touch roll side.
- Ra surface roughness
- the surface roughness of the styrene resin layer C side is 0.3 ⁇ m and the surface roughness of the styrene resin layer D side is 0.15 ⁇ m (Ra). ) Granted.
- styrene resin layers C and D 17% by mass of the styrene-butadiene block copolymer, 71% by mass of the polystyrene resin, and 12% by mass of the impact-resistant polystyrene resin were dry-blended and used. In this case, the content of the graft rubber in polystyrene is 1.2% by mass.
- Examples 2 to 10> A multilayer resin sheet was obtained in the same manner as in Example 1 except that the mixing ratios of the polystyrene-based resins of the styrene-based resin layers C and D were as shown in Table 1.
- Example 11 Using a metal roll (touch roll and cast roll) with a surface roughness (Ra) of 0.3 ⁇ m, the surface on the styrene resin layer C side is 0.2 ⁇ m, and the surface on the styrene resin layer D side is 0.2 ⁇ m.
- a multilayer resin sheet was obtained in the same manner as in Example 2 except that a surface roughness (Ra) of 0.1 ⁇ m was imparted.
- Example 12 Using a metal roll (touch roll and cast roll) having a surface roughness (Ra) of 1 ⁇ m, the surface on the styrene resin layer C side is 0.95 ⁇ m, and the surface on the styrene resin layer D side is 0. A multilayer resin sheet was obtained in the same manner as in Example 2 except that the surface roughness (Ra) of 5 ⁇ m was imparted.
- Example 13 Using a metal roll (touch roll and cast roll) with a surface roughness (Ra) of 1.5 ⁇ m, the surface on the styrene resin layer C side is 1.3 ⁇ m and the surface on the styrene resin layer D side.
- a multilayer resin sheet was obtained in the same manner as in Example 2 except that the surface roughness (Ra) of 1.0 ⁇ m was imparted.
- Example 14> Using a metal roll (touch roll and cast roll) having a surface roughness (Ra) of 2 ⁇ m, the surface on the styrene resin layer C side is 1.9 ⁇ m, and the surface on the styrene resin layer D side is 1. A multilayer resin sheet was obtained in the same manner as in Example 2 except that the surface roughness (Ra) of 2 ⁇ m was imparted.
- Example 15 Other than having a layer structure of styrene resin layer C 180 ⁇ m / modified olefin polymer layer A 25 ⁇ m / oxygen barrier resin layer 40 ⁇ m / modified olefin polymer layer B 25 ⁇ m / styrene resin layer D 350 ⁇ m, the overall thickness is 620 ⁇ m.
- a multilayer resin sheet was obtained in the same manner as in Example 2. The total thickness of the multi-layer resin sheet and the thickness of each resin layer are adjusted by adjusting the discharge amount of the molten resin raw material from each extruder and adjusting the interval between the outlets (lip openings) of the T-die, and in addition, the multi-layer. It was changed by adjusting the winding speed of the resin sheet.
- Example 16> Other than having a layer structure of styrene resin layer C 100 ⁇ m / modified olefin polymer layer A 25 ⁇ m / oxygen barrier resin layer 40 ⁇ m / modified olefin polymer layer B 25 ⁇ m / styrene resin layer D 350 ⁇ m, the overall thickness is 540 ⁇ m. , A multilayer resin sheet was obtained in the same manner as in Example 2.
- Example 17 Other than having a layer structure of styrene resin layer C 100 ⁇ m / modified olefin polymer layer A 20 ⁇ m / oxygen barrier resin layer 30 ⁇ m / modified olefin polymer layer B 20 ⁇ m / styrene resin layer D 630 ⁇ m, the overall thickness is 800 ⁇ m. , A multilayer resin sheet was obtained in the same manner as in Example 2.
- Example 18 Other than having a layer structure of styrene resin layer C 150 ⁇ m / modified olefin polymer layer A 20 ⁇ m / oxygen barrier resin layer 30 ⁇ m / modified olefin polymer layer B 20 ⁇ m / styrene resin layer D 800 ⁇ m, the overall thickness is 1020 ⁇ m. , A multilayer resin sheet was obtained in the same manner as in Example 2.
- Example 19 Other than having a layer structure of styrene resin layer C 80 ⁇ m / modified olefin polymer layer A 20 ⁇ m / oxygen barrier resin layer 30 ⁇ m / modified olefin polymer layer B 20 ⁇ m / styrene resin layer D 500 ⁇ m, the overall thickness is 650 ⁇ m. , A multilayer resin sheet was obtained in the same manner as in Example 2.
- Example 20> Other than having a layer structure of styrene resin layer C 100 ⁇ m / modified olefin polymer layer A 20 ⁇ m / oxygen barrier resin layer 30 ⁇ m / modified olefin polymer layer B 20 ⁇ m / styrene resin layer D 500 ⁇ m, the overall thickness is 670 ⁇ m. , A multilayer resin sheet was obtained in the same manner as in Example 2.
- Example 21 Other than having a layer structure of styrene resin layer C 200 ⁇ m / modified olefin polymer layer A 20 ⁇ m / oxygen barrier resin layer 30 ⁇ m / modified olefin polymer layer B 20 ⁇ m / styrene resin layer D 500 ⁇ m, the overall thickness is 770 ⁇ m. , A multilayer resin sheet was obtained in the same manner as in Example 2.
- Example 22> Other than having a layer structure of styrene resin layer C 250 ⁇ m / modified olefin polymer layer A 20 ⁇ m / oxygen barrier resin layer 30 ⁇ m / modified olefin polymer layer B 20 ⁇ m / styrene resin layer D 500 ⁇ m, the overall thickness is 820 ⁇ m. , A multilayer resin sheet was obtained in the same manner as in Example 2.
- Example 1 The same as in Example 1 except that the styrene-based resin layers C and D were dry-blended with 12% by mass of the styrene-butadiene block copolymer, 78% by mass of the polystyrene resin, and 10% by mass of the impact-resistant polystyrene resin.
- a multilayer resin sheet was obtained by the above method.
- Example 2 The same as in Example 1 except that 73% by mass of the styrene-butadiene block copolymer, 17% by mass of the polystyrene resin, and 10% by mass of the impact-resistant polystyrene resin were dry-blended into the styrene resin layers C and D. A multilayer resin sheet was obtained by the above method.
- Example 3 The same as in Example 1 except that 73% by mass of the styrene-butadiene block copolymer, 24% by mass of the polystyrene resin, and 3% by mass of the impact-resistant polystyrene resin were dry-blended into the styrene resin layers C and D. A multilayer resin sheet was obtained by the above method.
- Example 4 The same as in Example 1 except that the styrene-based resin layers C and D were dry-blended with 10% by mass of the styrene-butadiene block copolymer, 40% by mass of the polystyrene resin, and 50% by mass of the impact-resistant polystyrene resin.
- a multilayer resin sheet was obtained by the above method.
- styrene resin layers C and D 29% by mass of the styrene-butadiene block copolymer, 68% by mass of the polystyrene resin, and 3% by mass of the impact-resistant polystyrene resin are dry-blended and used, and the styrene resin layer C 160 ⁇ m / modified olefin is used.
- Example 6 The same as in Example 1 except that the styrene-based resin layers C and D were dry-blended with 58% by mass of the styrene-butadiene block copolymer, 15% by mass of the polystyrene resin, and 27% by mass of the impact-resistant polystyrene resin.
- a multilayer resin sheet was obtained by the above method.
- Ra A multilayer resin sheet was obtained in the same manner as in Example 1 except for the addition.
- ⁇ Comparative Example 8> Using a metal roll (touch roll and cast roll) having a surface roughness (Ra) of 5 ⁇ m and having been subjected to uneven processing, 2.4 ⁇ m on the surface on the styrene resin layer C side and 2. on the surface on the styrene resin layer D side. A multilayer resin sheet was obtained in the same manner as in Comparative Example 7, except that a surface roughness (Ra) of 1 ⁇ m was imparted.
- styrene resin layers C and D 65% by mass of the styrene-butadiene block copolymer, 25% by mass of the polystyrene resin, and 10% by mass of the impact-resistant polystyrene resin are dry-blended and used, and the styrene resin layer C 250 ⁇ m / modified olefin is used.
- styrene resin layers C and D 65% by mass of the styrene-butadiene block copolymer, 25% by mass of the polystyrene resin, and 10% by mass of the impact-resistant polystyrene resin are dry-blended and used, and the styrene resin layer C 40 ⁇ m / modified olefin is used.
- the evaluation method and criteria for the manufactured multilayer sheet are as follows. The results are shown in Tables 1 to 3.
- ⁇ Thickness of each layer of sheet> The sheet was cut out to a size of about 2 mm ⁇ 5 mm and surfaced with a single-edged knife. The obtained cross section was magnified and observed with a laser microscope VK-8500 manufactured by KEYENCE CORPORATION, and the thickness of each layer was measured.
- ⁇ Surface roughness (Ra)> The surface roughness (Ra) of the sheet was measured according to the following method. [Measurement method] Method described in JIS B0601 Equipment used: KEYENCE VK-8500 Co., Ltd.
- ⁇ Transparency> The total light transmittance of the sheet was measured according to the following method and evaluated according to the following criteria. [Measurement method] Method described in JIS K7105 Equipment used: Nippon Denshoku Kogyo Co., Ltd. Haze Meter NDH-5000 [Evaluation criteria] ⁇ : Total light transmittance 80% or more ⁇ : Total light transmittance less than 80%
- ⁇ Blocking resistance> The sheet was cut out to a size of 10 ⁇ 10 cm, and the inner surface of the winding and the outer surface of the winding were overlapped. A piece of metal of 5 ⁇ 5 cm and a weight of 10 kg were placed on it in order, and left to stand in an environment of 23 ° C. ⁇ 50% for 3 days. After 3 days, the weight and the metal piece were removed, and the samples were peeled off to confirm the presence or absence of blocking, and the blocking resistance was evaluated according to the following criteria. It is confirmed that the result of the evaluation by this evaluation method corresponds well to the blocking state of the roll after the sheet is formed into a film and left for a long period of time. ⁇ : The sample can be peeled off without resistance. X: It is impossible to peel off the sample.
- the multilayer resin sheet was processed in a series of steps from molding, notch forming, and container punching (FIG. 4) under the following conditions to obtain the container shown in FIG.
- the notch was formed from the surface on the styrene resin layer D side, and the heating temperature of the notch-forming portion was adjusted to 160 ° C. to provide a notch with a depth of 250 ⁇ m.
- Equipment used CFF-300 (manufactured by CKD Corporation) Hotdish temperature: 170 ° C Lower hotdish temperature: 170 °C
- Upper side structure of container punching blade Male blade
- Lower side structure of container punching blade Female blade Gap between upper and lower sides of container punching blade: 20 ⁇ m
- ⁇ Thickness distribution> The sides and bottom of the prepared container were palpated, and the presence or absence of uneven wall thickness was determined according to the following criteria. ⁇ : There is no bias in the wall thickness to the bottom surface, and the wall thickness of the side surface portion is sufficient. X: There is a bias in the wall thickness to the bottom surface, and the wall thickness on the side surface is thin.
- ⁇ Notch bendability> One of the prepared containers was grasped, and as shown in FIG. 3, the notch portion was repeatedly bent to the side opposite to the notched surface, and the notch bendability was judged to be superior or inferior according to the following criteria. ⁇ : It can be easily bent by hand and does not break even if it is bent 5 times or more. X: It cannot be easily bent by hand, or it breaks when it is bent once.
- the multilayer resin sheet for deep drawing molding of the present invention is easy to impart notch bendability after thermoforming, and also has good transparency, glossiness, and blocking resistance of the sheet. At the same time, it was confirmed that the moldability at the time of thermoforming into the container was good and the wall thickness distribution was not biased, so that a deep-drawn molded container having excellent design and visibility could be obtained.
- Comparative Example 1 and Comparative Example 4 in which the content of the styrene-conjugated diene block copolymer of the styrene resin layer D is small (the content of polystyrene containing the graft rubber is large) are notches. Regarding the bendability, cracking occurred by bending once. On the other hand, in Comparative Example 2 and Comparative Example 3 in which the content of the styrene-conjugated diene block copolymer was high (the content of polystyrene containing the graft rubber was low), the wall thickness distribution of the container was biased.
- Comparative Example 5 in which the content of the graft rubber in the polystyrene resin was low was inferior in blocking resistance, while Comparative Example 6 in which the content of the graft rubber in the polystyrene resin was high was inferior in transparency and glossiness. .. Further, in Comparative Example 7 in which the surface roughness (Ra) on the styrene resin layer D side was small, molding defects due to adhesion to a hot plate were observed during molding on the container. On the other hand, in Comparative Example 8 in which the surface roughness (Ra) was large on both the styrene-based resin layer C side and the styrene-based resin layer D side, the transparency glossiness was inferior.
- Comparative Example 9 in which the ratio of the thickness of the styrene resin layer D was small, a phenomenon was observed in which the styrene resin layer D was cut off during the notch processing and the modified olefin polymer layer B was exposed.
- Comparative Example 10 in which the ratio of the thickness of the styrene-based resin layer D was large, the notch bendability could not be easily bent by hand.
- Comparative Example 11 in which the ratio of the thickness of the styrene resin layer C was small, a phenomenon was observed in which the styrene resin layer C was cut off during container molding and the modified olefin polymer layer A was exposed.
- Comparative Example 12 in which the ratio of the thickness of the styrene-based resin layer C was large, could not be easily bent by hand in terms of notch bendability.
- Oxygen barrier resin layer 2 Modified olefin polymer layer A 3 Modified olefin polymer layer B 4 Styrene-based resin layer C 5 Styrene-based resin layer D
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Abstract
Description
(1)酸素バリア性樹脂層と、前記酸素バリア性樹脂層の両面に、それぞれ変性オレフィン系重合体層A及びBを介して積層されてなるスチレン系樹脂層C及びDとを含む、多層樹脂シートであって、全体の厚みが500~1200μmであり、前記スチレン系樹脂層Cの厚みは、前記全体の厚みの10~35%であり、前記スチレン系樹脂層Dの厚みは、前記全体の厚みの50~80%であり、前記スチレン系樹脂層C及びDの、前記変性オレフィン系重合体層A及びBと対向する面とは反対側の面の表面粗さ(Ra)は、0.1~2.0μmであり、前記スチレン系樹脂層Dは、スチレン-共役ジエンブロック共重合体15~70質量%、及びスチレン単量体がグラフト重合した共役ジエン系ゴムを0.5~5質量%含有するポリスチレン30~85質量%を含むことを特徴とする多層樹脂シート。
(2)前記酸素バリア性樹脂層が、エチレン-ビニルアルコール共重合体樹脂を含んでなる、(1)に記載の多層樹脂シート。
(3)前記変性オレフィン系重合体層A及びBの厚みが、それぞれ10~50μmである、(1)又は(2)に記載の多層樹脂シート。
(4)前記酸素バリア性樹脂層の厚みが、10~50μmである、(1)から(3)のいずれかに記載の多層樹脂シート。
(5)(1)から(4)のいずれかに記載の多層樹脂シートの成形品。
(6)スチレン系樹脂層D側の面にノッチを有する成形容器である、(5)に記載の成形品。
本発明の一実施形態に係る多層樹脂シートは、図1に示すように、酸素バリア性樹脂層と、前記酸素バリア性樹脂層の両面に、それぞれ変性オレフィン系重合体層A及びBを介して積層されてなるスチレン系樹脂層C及びDとを含む、多層樹脂シートであって、全体の厚みが500~1200μmであり、前記スチレン系樹脂層Cの厚みは、前記全体の厚みの10~35%であり、前記スチレン系樹脂層Dの厚みは、前記全体の厚みの50~80%であり、前記スチレン系樹脂層C及びDの、前記変性オレフィン系重合体層A及びBと対向する面とは反対側の面の表面粗さ(Ra)は、0.1~2.0μmであり、前記スチレン系樹脂層Dは、スチレン-共役ジエンブロック共重合体15~70質量%、及びスチレン単量体がグラフト重合した共役ジエン系ゴムを0.5~5質量%含有するポリスチレン30~85質量%を含むことを特徴とする多層樹脂シートである。
酸素バリア性樹脂層は、例えば、エチレン-ビニルアルコール共重合体樹脂、ポリアミド樹脂等の酸素バリア性樹脂を主として含有する。その中でも、加工性、成形性の面でエチレン-ビニルアルコール共重合体樹脂を含有することが好ましい。
ここで、「主として含有する」とは、その樹脂を50質量%以上含有することを意味する。他の実施形態においては、70質量%以上、もしくは90質量%以上含有するか、その樹脂のみからなってもよい。
エチレン-ビニルアルコール共重合体樹脂中のエチレン含有量は、例えば、核磁気共鳴分光法(NMR)によって算出することができる。
酸素バリア層の厚みの、後述する多層樹脂シート全体の厚みに対する割合は、0.5~15%が好ましく、1~10%がより好ましく、2~8%がさらに好ましい。
変性オレフィン系重合体層A及びBは、エチレン、プロピレン、ブテン-1等の炭素数2~8程度のオレフィンの単独重合体、それらのオレフィンとエチレン、プロピレン、ブテン-1、3-メチルブテン-1、ペンテン-1、4-メチルペンテン-1、ヘキセン-1、オクテン-1、デセン-1等の炭素数2~20程度の他のオレフィンや酢酸ビニル、塩化ビニル、アクリル酸、メタクリル酸、アクリル酸エステル、メタクリル酸エステル、スチレン等のビニル化合物との共重合体等のオレフィン系樹脂や、エチレン-プロピレン共重合体、エチレン-プロピレン-ジエン共重合体、エチレン-ブテン-1共重合体、プロピレン-ブテン-1共重合体等のオレフィン系ゴムを、アクリル酸、メタクリル酸、クロトン酸、イソクロトン酸、マレイン酸、フマル酸、イタコン酸、シトラコン酸、テトラヒドロフタル酸等の不飽和カルボン酸、または、その酸ハライド、アミド、イミド、無水物、エステル等の誘導体、具体的には、塩化マレイル、マレイミド、無水マレイン酸、無水シトラコン酸、マレイン酸モノメチル、マレイン酸ジメチル、マレイン酸グリシジル等でグラフト反応条件下に変性したものから選択される変性オレフィン系重合体を主として含有する。変性オレフィン系重合体層Aを構成する変性オレフィン系重合体は、変性オレフィン系重合体層Bを構成する変性オレフィン系重合体と同じであってもよく、異なっていてもよい。
変性オレフィン系重合体層A及びBの厚みの、後述する多層樹脂シート全体の厚みに対する割合は、それぞれ0.5~15%が好ましく、1~10%がより好ましく、1.5~4%がさらに好ましい。
スチレン系樹脂層Cは、例えば、本発明の効果を阻害しない範囲で、スチレン、α-メチルスチレン、p-メチルスチレン、ジメチルスチレン、p-t-ブチルスチレン、クロロスチレン等のスチレン系単量体の単独または共重合体、それらスチレン系単量体と他の単量体との共重合体、例えばスチレン-アクリルニトリル共重合体(AS樹脂)、または、前記スチレン系単量体を一種類あるいは二種類以上、あるいはさらに他の単量体とともに、ポリブタジエン、スチレン-ブタジエン共重合体、ポリイソプレン、ポリクロロプレン等の共役ジエン系ゴム質重合体の存在下にグラフト重合したグラフト重合体、例えば耐衝撃性ポリスチレン(HIPS樹脂)、スチレン-アクリルニトリルグラフト重合体(ABS樹脂)等のスチレン系樹脂から選択されるスチレン系樹脂を主として含有する。スチレン系樹脂は、単独、または組み合わせてスチレン系樹脂層として使用することができる。また、後述するスチレン系樹脂層Dに用いられるスチレン系樹脂を使用してもよい。
スチレン系樹脂層Cの厚みは、好ましくは50~420μm、より好ましくは70~260μm、さらに好ましくは150~200μmである。
スチレン系樹脂層Dは、スチレン-共役ジエンブロック共重合体15~70質量%、及びスチレン単量体がグラフト重合した共役ジエン系ゴムを0.5~5質量%含有するポリスチレン30~85質量%を含むスチレン系樹脂を含んでなる。
一実施形態において、スチレン系樹脂層Dは、スチレン-共役ジエンブロック共重合体を40~60質量%含んでもよく、45~55質量%含んでもよい。
また、スチレン系樹脂層Dは、スチレン単量体がグラフト重合した共役ジエン系ゴムを0.5~5質量%含有するポリスチレンを40~60質量%含んでもよく、45~55質量%含んでもよい。
スチレン系単量体としてはスチレン、o-メチルスチレン、p-メチルスチレン、p-tert-ブチルスチレン、1,3-ジメチルスチレン、α-メチルスチレン、ビニルナフタレン、ビニルアントラセン、1,1-ジフェニルエチレン等がある。本実施形態においてはスチレンが主体であるが、前記の他の成分を微量成分として1種以上含むものであってもよい。
スチレン系樹脂層に用いられる全スチレン系樹脂に対するグラフトゴムの含有量は、0.3~3質量%が好ましく、0.3~2.5質量%がより好ましく、0.5~2.0質量%がさらに好ましい。
スチレン系樹脂層Dの厚みは、好ましくは250~850μm、より好ましくは340~750μm、さらに好ましくは500~580μmである。
本実施形態の多層樹脂シートは、深絞り成形用として用いることができる。ここで、「深絞り成形用」とは、深絞り成形に適した特性を備えていることを意味し、深絞りとは、成形容器の形状にかかわらず、成形容器の深さと幅(複数の幅がある形状では最大の幅)の比である絞り比が0.5以上のものと定義する。ここでの深絞り成形容器は、この絞り比が0.5以上、好ましくは0.9以上、より好ましくは1以上、最も好ましくは1.5以上の容器である。
本実施形態の多層樹脂シートの製造方法は、特に限定されず、一般的な方法を用いることができる。例えば、3台もしくはそれ以上の単軸押出機を用いて各々の原料樹脂を溶融押出し、フィードブロックとTダイによって多層樹脂シートを得る方法や、マルチマニホールドダイを使用して多層樹脂シートを得る方法が挙げられる。
本発明の第二実施形態に係る成形容器は、第一実施形態に係る多層樹脂シートを熱形成してなり、一方の面に形成されたノッチを有する成形容器である。
本実施形態の成形容器は、上記第一実施形態の多層樹脂シートを熱成形してなる。図2及び図3に、本発明の一実施形態の成形容器の一例を示す。熱成形方法としては、一般的な真空成形、圧空成形や、これらの応用として、シートの片面にプラグを接触させて成形を行うプラグアシスト法、また、シートの両面に一対をなす雄雌型を接触させて成形を行う、いわゆるマッチモールド成形と称される方法等が挙げられるが、これに限定されるものではない。また、成形前にシートを加熱軟化させる方法として非接触加熱である赤外線ヒーター等による輻射加熱等、公知のシート加熱方法を適用することができる。
(1)酸素バリア性樹脂層
エチレン-ビニルアルコール共重合体「エバールJ-171B」(クラレ社製、エチレン含量32モル%、鹸化度99%以上)
(2)変性オレフィン系重合体層
「モディックF502」(三菱ケミカル社製)
(3)スチレン系樹脂層
耐衝撃性ポリスチレン樹脂:「トーヨースチロールH870」(東洋スチレン社製、グラフトゴム含有量8.6質量%、グラフトゴムの粒子径2.5μm)
ポリスチレン樹脂:「HRM23」(東洋スチレン社製)
スチレン-共役ジエンブロック共重合体:「730L」(デンカ社製、共役ジエン含有量25質量%)
酸素バリア性樹脂層及び変性オレフィン系重合体層A及びB用として2台の40mm単軸押出機と、スチレン系樹脂層C及びD用として1台の65mm単軸押出機を使用し、フィードブロック法により、スチレン系樹脂層C160μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層30μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D570μmという層構成を有し、全体の厚みが800μmの多層樹脂シートを得た。多層樹脂シートには、引取ロール(タッチロール及びキャストロール)として表面粗さ(Ra)が0.5μmの凹凸加工を施した金属ロールを用い、スチレン系樹脂層C側の面をタッチロール側、スチレン系樹脂層D側の面をキャストロール側にして挟持することにより、スチレン系樹脂層C側の面に0.3μm、スチレン系樹脂層D側の面に0.15μmの表面粗さ(Ra)付与した。スチレン系樹脂層C及びDには、スチレン-ブタジエンブロック共重合体17質量%、ポリスチレン樹脂71質量%、耐衝撃性ポリスチレン樹脂12質量%をドライブレンドして用いた。この場合、ポリスチレン中のグラフトゴムの含有量は1.2質量%となる。
スチレン系樹脂層C及びDのポリスチレン系樹脂の配合割合を表1に示す通りとした他は、実施例1と同様の方法で多層樹脂シートを得た。
表面粗さ(Ra)が0.3μmの凹凸加工を施した金属ロール(タッチロール及びキャストロール)を用い、スチレン系樹脂層C側の面に0.2μm、スチレン系樹脂層D側の面に0.1μmの表面粗さ(Ra)付与した他は、実施例2と同様の方法で多層樹脂シートを得た。
表面粗さ(Ra)が1μmの凹凸加工を施した金属ロール(タッチロール及びキャストロール)を用い、スチレン系樹脂層C側の面に0.95μm、スチレン系樹脂層D側の面に0.5μmの表面粗さ(Ra)付与した他は、実施例2と同様の方法で多層樹脂シートを得た。
表面粗さ(Ra)が1.5μmの凹凸加工を施した金属ロール(タッチロール及びキャストロール)を用い、スチレン系樹脂層C側の面に1.3μm、スチレン系樹脂層D側の面に1.0μmの表面粗さ(Ra)付与した他は、実施例2と同様の方法で多層樹脂シートを得た。
表面粗さ(Ra)が2μmの凹凸加工を施した金属ロール(タッチロール及びキャストロール)を用い、スチレン系樹脂層C側の面に1.9μm、スチレン系樹脂層D側の面に1.2μmの表面粗さ(Ra)付与した他は、実施例2と同様の方法で多層樹脂シートを得た。
スチレン系樹脂層C180μm/変性オレフィン系重合体層A25μm/酸素バリア性樹脂層40μm/変性オレフィン系重合体層B25μm/スチレン系樹脂層D350μmという層構成を有し、全体の厚みが620μmとした他は、実施例2と同様な方法で多層樹脂シートを得た。なお、多層樹脂シートの全体の厚み及び各樹脂層の厚みは、各押出機からの溶融樹脂原料の吐出量を調節するとともに、Tダイの出口(リップ口)の間隔を調節し、加えて多層樹脂シートの巻き取り速度を調節することで変化させた。
スチレン系樹脂層C100μm/変性オレフィン系重合体層A25μm/酸素バリア性樹脂層40μm/変性オレフィン系重合体層B25μm/スチレン系樹脂層D350μmという層構成を有し、全体の厚みが540μmとした他は、実施例2と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C100μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層30μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D630μmという層構成を有し、全体の厚みが800μmとした他は、実施例2と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C150μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層30μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D800μmという層構成を有し、全体の厚みが1020μmとした他は、実施例2と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C80μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層30μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D500μmという層構成を有し、全体の厚みが650μmとした他は、実施例2と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C100μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層30μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D500μmという層構成を有し、全体の厚みが670μmとした他は、実施例2と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C200μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層30μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D500μmという層構成を有し、全体の厚みが770μmとした他は、実施例2と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C250μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層30μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D500μmという層構成を有し、全体の厚みが820μmとした他は、実施例2と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C及びDには、スチレン-ブタジエンブロック共重合体12質量%、ポリスチレン樹脂78質量%、耐衝撃性ポリスチレン樹脂10質量%をドライブレンドして用いた他は、実施例1と同様の方法で多層樹脂シートを得た。
スチレン系樹脂層C及びDには、スチレン-ブタジエンブロック共重合体73質量%、ポリスチレン樹脂17質量%、耐衝撃性ポリスチレン樹脂10質量%をドライブレンドして用いた他は、実施例1と同様の方法で多層樹脂シートを得た。
スチレン系樹脂層C及びDには、スチレン-ブタジエンブロック共重合体73質量%、ポリスチレン樹脂24質量%、耐衝撃性ポリスチレン樹脂3質量%をドライブレンドして用いた他は、実施例1と同様の方法で多層樹脂シートを得た。
スチレン系樹脂層C及びDには、スチレン-ブタジエンブロック共重合体10質量%、ポリスチレン樹脂40質量%、耐衝撃性ポリスチレン樹脂50質量%をドライブレンドして用いた他は、実施例1と同様の方法で多層樹脂シートを得た。
スチレン系樹脂層C及びDには、スチレン-ブタジエンブロック共重合体29質量%、ポリスチレン樹脂68質量%、耐衝撃性ポリスチレン樹脂3質量%をドライブレンドして用い、スチレン系樹脂層C160μm/変性オレフィン系重合体層A15μm/酸素バリア性樹脂層20μm/変性オレフィン系重合体層B15μm/スチレン系樹脂層D590μmという層構成を有し、全体の厚みが800μmとした他は、実施例1と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C及びDには、スチレン-ブタジエンブロック共重合体58質量%、ポリスチレン樹脂15質量%、耐衝撃性ポリスチレン樹脂27質量%をドライブレンドして用いた他は、実施例1と同様の方法で多層樹脂シートを得た。
スチレン系樹脂層C及びDには、スチレン-ブタジエンブロック共重合体58質量%、ポリスチレン樹脂30質量%、耐衝撃性ポリスチレン樹脂12質量%をドライブレンドして用い、表面粗さ(Ra)が0.2μmの凹凸加工を施した金属ロール(タッチロール及びキャストロール)を用いてスチレン系樹脂層C側の面に0.1μm、スチレン系樹脂層D側の面に0.07μmの表面粗さ(Ra)付与した他は、実施例1と同様の方法で多層樹脂シートを得た。
表面粗さ(Ra)が5μmの凹凸加工を施した金属ロール(タッチロール及びキャストロール)を用い、スチレン系樹脂層C側の面に2.4μm、スチレン系樹脂層D側の面に2.1μmの表面粗さ(Ra)付与した他は、比較例7と同様の方法で多層樹脂シートを得た。
スチレン系樹脂層C及びDには、スチレン-ブタジエンブロック共重合体65質量%、ポリスチレン樹脂25質量%、耐衝撃性ポリスチレン樹脂10質量%をドライブレンドして用い、スチレン系樹脂層C250μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層30μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D250μmという層構成を有し、全体の厚みが570μmとした他は、実施例1と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C100μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層20μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D800μmという層構成を有し、全体の厚みが960μmとした他は、比較例9と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C及びDには、スチレン-ブタジエンブロック共重合体65質量%、ポリスチレン樹脂25質量%、耐衝撃性ポリスチレン樹脂10質量%をドライブレンドして用い、スチレン系樹脂層C40μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層30μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D390μmという層構成を有し、全体の厚みが500μmとした他は、実施例1と同様な方法で多層樹脂シートを得た。
スチレン系樹脂層C350μm/変性オレフィン系重合体層A20μm/酸素バリア性樹脂層30μm/変性オレフィン系重合体層B20μm/スチレン系樹脂層D480μmという層構成を有し、全体の厚みが900μmとした他は、実施例12と同様な方法で多層樹脂シートを得た。
シートを2mm×5mm程度に切り出し、片刃ナイフで面出しを行った。得られた断面を(株)キーエンス製 レーザー顕微鏡 VK-8500で拡大観察し、各層の厚みを測定した。
シートの表面粗さ(Ra)を、以下の方法に従って測定した。
[測定方法] JIS B0601に記載された方法
使用機器:(株)キーエンス VK-8500
シートの全光線透過率を、以下の方法に従って測定し、以下の基準で評価した。
[測定方法] JIS K7105に記載された方法
使用機器:日本電色工業(株)ヘーズメーター NDH-5000
[評価基準]
○:全光線透過率80%以上
×:全光線透過率80%未満
シートの光沢度を、以下の方法に従って測定し、以下の基準で評価した。
[測定方法] JIS Z8741に記載された方法
使用機器:日本電色工業(株)グロスメーターVG7000
測定角度:60°
[評価基準]
○:光沢度80以上
×:光沢度80未満
シートを10×10cmに切り出し、巻き内面と巻き外面を重ねた。その上に、5×5cmの金属片、10kgの重りを順に乗せて、23℃×50%の環境下で3日間放置した。3日後、重りと金属片を取り除き、サンプル同士を引き剥がしブロッキングの有無を確認し、以下の基準で耐ブロッキング性を評価した。尚、この評価方法で評価した結果は、シートを製膜して長期間放置した後の、ロールのブロッキング状態と、良く対応していることを確認している。
○:抵抗なくサンプルを引き剥がすことが可能である。
×:サンプルを引き剥がすことが不可能である。
使用機器:CFF-300(CKD株式会社製)
上熱盤温度: 170℃
下熱盤温度: 170℃
容器打ち抜き刃上側構造:雄刃
容器打ち抜き刃下側構造:雌刃
容器打ち抜き刃の上側下側間の間隙:20μm
容器を熱成形する際の成形性を、以下の基準で評価した。
○:成形性良好
×:熱盤付着による成形不良や表面層の破れが確認される。
作製した容器の側面、および底面を触診し、肉厚の偏りの有無を以下の基準に従い判定した。
○:底面への肉厚の偏りがなく、側面部分の肉厚が十分である。
×:底面への肉厚の偏りがあり、側面部分の肉厚が薄い。
作製した容器の一方を把持し、図3に示すように、ノッチ部分でノッチを入れた面とは逆側に繰り返し折り曲げ、ノッチ折り曲げ性を以下の基準に従い、優劣を判定した。
○:手で容易に折り曲げることが出来る、かつ5回以上折り曲げても割れない。
×:手で容易に折り曲げることが出来ない、または1回折り曲げることで割れる。
上記全ての評価結果が○であるものを○、それ以外のものを×とした。
2 変性オレフィン系重合体層A
3 変性オレフィン系重合体層B
4 スチレン系樹脂層C
5 スチレン系樹脂層D
Claims (6)
- 酸素バリア性樹脂層と、
前記酸素バリア性樹脂層の両面に、それぞれ変性オレフィン系重合体層A及びBを介して積層されてなるスチレン系樹脂層C及びDとを含む、多層樹脂シートであって、
全体の厚みが500~1200μmであり、
前記スチレン系樹脂層Cの厚みは、前記全体の厚みの10~35%であり、
前記スチレン系樹脂層Dの厚みは、前記全体の厚みの50~80%であり、
前記スチレン系樹脂層C及びDの、前記変性オレフィン系重合体層A及びBと対向する面とは反対側の面の表面粗さ(Ra)は、0.1~2.0μmであり、
前記スチレン系樹脂層Dは、スチレン-共役ジエンブロック共重合体15~70質量%、及びスチレン単量体がグラフト重合した共役ジエン系ゴムを0.5~5質量%含有するポリスチレン30~85質量%を含んでなる、多層樹脂シート。 - 前記酸素バリア性樹脂層が、エチレン-ビニルアルコール共重合体樹脂を含んでなる、請求項1に記載の多層樹脂シート。
- 前記変性オレフィン系重合体層A及びBの厚みが、それぞれ10~50μmである、請求項1または2に記載の多層樹脂シート。
- 前記酸素バリア性樹脂層の厚みが、10~50μmである、請求項1から3のいずれか一項に記載の多層樹脂シート。
- 請求項1から4のいずれか一項に記載の多層樹脂シートの成形品。
- スチレン系樹脂層D側の面にノッチを有する成形容器である、請求項5に記載の成形品。
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JP2017171770A (ja) * | 2016-03-23 | 2017-09-28 | 積水化成品工業株式会社 | ポリスチレン系樹脂発泡シート及びその製造方法、並びに、成形体 |
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JP2008213355A (ja) * | 2007-03-06 | 2008-09-18 | Denki Kagaku Kogyo Kk | 熱可塑性多層樹脂シート及び成形容器 |
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WO2017221374A1 (ja) * | 2016-06-23 | 2017-12-28 | デンカ株式会社 | 多層樹脂シート及び成形容器 |
JP2020121505A (ja) * | 2019-01-31 | 2020-08-13 | 旭化成株式会社 | 剥離機能付き多層フィルム及びその包装体 |
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