JP2001131308A - Thermoplastic resin composition sheet - Google Patents

Abstract

(57) [Problem] To obtain a sheet having a beautiful appearance suitable for container molding. A (A) 5 to 95 wt% styrene-based resin and (B) is a sheet made of a thermoplastic resin composition containing 95 to 5% by weight crystalline thermoplastic resin, the sheet surface 1 m ² per 0. A thermoplastic resin composition sheet having no unevenness and / or discoloration having an area exceeding 1 mm ² .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a thermoplastic resin composition sheet having a particularly beautiful surface appearance, a method for producing the same, and a container obtained from the thermoplastic resin composition sheet.

[0002]

2. Description of the Related Art When a thermoplastic resin is extruded from an extruder into a strand or a sheet, a die adheres to the die, impairing the surface appearance of the strand or sheet, or causing projections. In some cases, there may be a problem of damage such as a strip.

As a solution to such a problem, the latest technology of plastic extrusion molding (Keiji Sawada, Lapar Digest Co., 1993) is to mix raw materials that are difficult to plate out, to dry the materials, and to use a die. A method is disclosed in which a radius of about 0.2 mm is provided at the exit of the above and polished, but this is not a satisfactory solution.

Japanese Patent Application Laid-Open No. 9-255820 discloses the addition of a fluorine-based processing agent.
No. 0 discloses the addition of silicone oil, and Japanese Patent Application Laid-Open No. 9-104766 discloses the addition of a lubricant. In addition, manufacturing management becomes complicated.

Japanese Patent Application Laid-Open No. H11-48306 discloses a method of attaching a suction device along a die to suck a sublimable substance. It is not possible to remove the dust caused by low molecular substances generated inside the machine.

[0006] Furthermore, the above-mentioned prior art cannot solve the problem that when the composition containing the incompatible resins is extruded from the extruder, the die adheres to the die.

[0007] It is an object of the present invention to provide a thermoplastic resin composition sheet having a beautiful surface appearance by preventing occurrence of rust at an extrusion outlet during extrusion molding.
Another object of the present invention is to provide a method for producing the thermoplastic resin composition sheet and a container obtained from the thermoplastic resin composition sheet.

[0008]

The present invention relates to (A) 5-95% by weight of a styrene resin and 95-95% of a crystalline thermoplastic resin.
Provided is a sheet made of a thermoplastic resin composition containing 5% by weight and having no unevenness and / or discoloration in an area having an area of more than 0.1 mm ² per 1 m ^{2 of} the sheet surface.

[0009] The "irregularities" referred to in the present invention are mainly caused by crepe in the process of forming into a sheet, and include protrusions or gel-like protrusions integrated with the sheet, foreign matters adhering to the sheet, It refers to anything that impairs the appearance of the sheet, such as damage to the sheet in various shapes and depths. The “area” is an area when the sheet is viewed in a plan view.

The present invention also relates to a method for producing the above-mentioned thermoplastic resin composition sheet, wherein the temperature of the resin at the exit of the T-die is set to (B)
Temperature drop rate 1 of JIS K7121 of crystalline thermoplastic resin
A method for producing a thermoplastic resin composition sheet including a step of forming a sheet while setting and maintaining the melting point (Tm) at 0 ° C./minute to be 20 to 100 ° C. higher, and comprising the above thermoplastic resin composition sheet Provide a container.

The thermoplastic resin composition sheet of the present invention includes those having a non-foamed structure and those having a foamed structure.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The thermoplastic resin composition used in the present invention comprises the components (A), (B) and, if desired, other components.

The styrene resin as the component (A) includes a homopolymer of an aromatic vinyl monomer, a copolymer of an aromatic vinyl monomer and a copolymerizable vinyl monomer, and a rubber component and a styrene resin. Rubber-modified styrenic resins (including styrenic thermoplastic elastomers) and the like.
A combination of two or more species may be used. (A)
The components do not include those having crystallinity such as crystalline polystyrene.

The aromatic vinyl monomer includes styrene, styrene derivatives (p-methylstyrene, p-ethylstyrene,
p-isopropylstyrene, butylstyrene, pt-
Butylstyrene, α-methylstyrene, alkylstyrene such as vinyltoluene, etc.), and styrene and α-methylstyrene are preferred.

The copolymerizable vinyl monomers include vinyl cyanide monomers (acrylonitrile, methacrylonitrile, etc.),
(Meth) acrylate monomers (hydroxyl groups such as C1-10 alkyl (meth) acrylate such as methyl methacrylate, 2-hydroxyethyl (meth) acrylate, and 2-hydroxypropyl (meth) acrylate) (Meth) acrylate, glycidyl (meth) acrylate, etc.), carboxy group-containing monomers [(meth) acrylic acid, maleic anhydride, maleic acid, fumaric acid, itaconic acid, etc.], maleimide monomers (maleimide, N-
Methylmaleimide, N-butylmaleimide, N-phenylmaleimide, etc.). Among these, (meth) acrylates such as methyl methacrylate, and maleimide monomers such as (meth) acrylic acid, maleic anhydride, and N-phenylmaleimide are preferable.

Examples of the homopolymer of the aromatic vinyl monomer include polystyrene, and examples of the copolymer using the aromatic vinyl monomer include a styrene-acrylonitrile copolymer (AS resin) and styrene-methyl methacrylate. Copolymers, styrene- (meth) acrylic acid copolymers, and styrene-maleic anhydride copolymers are exemplified.

In the rubber-modified styrene resin, the rubber component is a conjugated diene rubber (polybutadiene, polyisoprene, 2-chloro-1,1,3-butadiene,
-Chloro-1,3-butadiene, butadiene-styrene copolymer, etc.), ethylene-propylene rubber (EPDM rubber), acrylic rubber, and the like. Among them, conjugated diene rubber is preferable.

The rubber-modified styrenic resin may be an impact-resistant styrenic resin composed of a mixture of a rubber component and a non-rubber-modified styrenic resin. Graft copolymer (impact styrene resin) of rubber component obtained by polymerizing aromatic vinyl monomer and aromatic vinyl monomer, and rubber block and aromatic vinyl copolymer block (ABA type block) Copolymers). Block copolymers often form thermoplastic elastomers. The graft copolymer may be a random copolymer, and the structure of the block copolymer may be linear or star.

In the case of making a graft copolymer, it is preferable to use an aromatic vinyl monomer and a vinyl cyanide monomer in combination, and it is also possible to further use the copolymerizable vinyl monomer as needed. it can. The ratio between the aromatic vinyl monomer and the vinyl cyanide monomer is from 10/90 to 90 /
10, preferably 20/80 to 80/20, more preferably 30/70 to 70/30. The ratio of the aromatic vinyl monomer to the copolymerizable vinyl monomer is 10/10 by weight.
90-90 / 10, preferably 30 / 70-70 / 30
It is.

Examples of the rubber-modified styrene resin include graft copolymers, for example, styrene-butadiene copolymer (SB resin), butadiene-styrene-maleic anhydride (rubber-modified styrene-maleic anhydride copolymer), styrene Acrylonitrile-butadiene copolymer (ABS
Resin), AXS resin [A is acrylonitrile, X is at least one rubber component selected from ethylene-propylene rubber (EPDM rubber), acrylic rubber, ethylene-vinyl acetate copolymer and chlorinated polyethylene, S is styrene]
Styrene-based block copolymers such as styrene-
Butadiene-styrene (SBS) copolymer, styrene-
Examples include thermoplastic elastomers such as isoprene-styrene (SIS) copolymer. Among them, SB resin (HIPS), rubber-modified styrene-maleic anhydride copolymer, ABS resin, SBS block copolymer, SIS
Block copolymers are preferred. The content of the rubber component in the rubber-modified styrenic resin is preferably 5 to 70% by weight,
More preferably, it is 6 to 50% by weight.

As the component (A), a rubber-modified styrene resin, particularly impact-resistant polystyrene, is used to impart a high level of strength and impact resistance in a well-balanced form when formed into a foamed sheet or a container. (HIPS) or a thermoplastic elastomer is preferably used.

When a rubber-modified styrene resin is used as described above, the rubber content in the thermoplastic resin composition is as follows:
Preferably 1 to 20% by weight (for example 5 to 20% by weight),
More preferably, it is 3 to 15% by weight (for example, 5 to 15% by weight), and still more preferably, 4 to 10% by weight (for example, 5 to 10% by weight).
% By weight). When the rubber content is 1% by weight or more, impact resistance is enhanced, and when the rubber content is 20% by weight or less, lowering of the stiffness of a sheet or a container is prevented.

When a rubber-modified styrenic resin is constituted by a combination of a graft copolymer and a block copolymer,
Rubber content ratio (raft copolymer / block copolymer;
Weight ratio) is preferably 0.01 to 15, more preferably 0.05 to 2, and even more preferably 0.1 to 1.5. When the weight ratio is 0.01 or more, container moldability is good, and the sheet is prevented from being broken or uneven thickness at the time of molding. When the weight ratio is 15 or less, projections are formed or impact resistance is reduced. It is prevented from lowering.

Further, the average particle diameter of the rubber component is preferably 0.5 to 5 μm, more preferably 1 to 4.5 μm (for example, 1 to 3 μm), and still more preferably 1.5 to 4.5 μm.
It is. When the average particle diameter is 0.5 μm or more, the impact resistance is enhanced, and when the average particle diameter is 5 μm or less, the decrease in the surface gloss of the container is prevented. The average particle size of the rubber component is
This is a value measured by a laser method using a laser diffraction / scattering type particle size distribution analyzer LA-910 manufactured by Horiba, Ltd. The form of the rubber component is not limited to a single particle shape, and may include an onion structure, a salami structure, and the like.

The content of the component (A) is 5 to 95% by weight,
Preferably from 20 to 80% by weight, more preferably from 25 to 7%.
It is 5% by weight, more preferably 30 to 60% by weight.

The crystalline thermoplastic resin as the component (B) has a melting point of 120 measured according to JIS K7121.
One or more selected from those having a temperature of from -240 ° C.
When the melting point is 120 ° C. or higher, heat resistance increases,
When it is less than the above, uniform mixing and dispersion and foam molding are facilitated, and the occurrence of poor appearance and the reduction of impact resistance are prevented.

As the component (B), an olefin resin,
One or more selected from crystalline polystyrene, polyester resins, polyamide resins, polycarbonate resins, polysulfone resins, polyether resins, polyketone resins, polyacetal resins, and olefin resins, particularly polypropylene, are preferred. .

The content of the component (B) is 95 to 5% by weight,
Preferably 80 to 20% by weight, more preferably 75 to 2%
It is 5% by weight, more preferably 60 to 30% by weight.

The thermoplastic resin composition may further contain one or more selected from dispersants, compatibilizers, antioxidants and heat stabilizers.

As the compatibilizer, a component which reacts with one or both of the components (A) and (B) to improve wettability,
Components having a skeleton or structure close to at least a part of the skeleton or structure of the components (A) and (B) can be used, and examples thereof include one or more types selected from the following (a) and (b).

(A) Vinyl aromatic compound (styrene, etc.)
(Random, block or graft copolymer) composed of a unit (monomer unit or polymer unit) and a unit (monomer unit or polymer unit) of a conjugated diene compound (butadiene or the like) Hydrogenated products.

(B) Vinyl aromatic compounds (styrene, etc.)
(Random, block or graft copolymer) composed of a unit (monomer unit or polymer unit) and a unit (monomer unit or polymer unit) of a conjugated diene compound (butadiene or the like) Epoxide hydrogenated product.

Specific examples of the compatibilizer include styrene-ethylene-butylene-styrene copolymer (SEBS) and styrene-ethylene-propylene-styrene copolymer (S
(EPS), an epoxy obtained by epoxidizing an unsaturated double bond of a conjugated diene compound in a block copolymer composed of a polymer block mainly containing a vinyl aromatic compound and a polymer block mainly containing a conjugated diene. Part of the modified block copolymer or a completely hydrogenated epoxy-modified block copolymer may, for example, be mentioned.

Examples of the dispersant include metal stearates (salts such as Ca, Mg and Zn), and examples of the antioxidant include hindered phenol compounds and phosphoric acid compounds.

The amount of the above compatibilizer, dispersant, antioxidant and heat stabilizer is preferably 0.01 to 20 parts by weight, more preferably 0.1 to 20 parts by weight, per 100 parts by weight of the composition.
20 parts by weight, more preferably 1 to 15 parts by weight, particularly preferably 2 to 10 parts by weight. When the amount of these components is 0.0
If it is 1 part by weight or more, the occurrence of unevenness and discoloration is prevented,
When the amount is less than 20 parts by weight, it is possible to prevent the bleeding out of the sheet surface and the stickiness from occurring.

The thermoplastic resin composition may further contain conventional additives such as a release agent, an antistatic agent, a filler, and a coloring agent (titanium oxide, red iron oxide, azo-based, perylene-based, phthalocyanine-based, heterocyclic-based coloring). Agents, etc.), plasticizers, spreading agents (polyethylene glycol, mineral oil, etc.) and the like.

The thermoplastic resin composition sheet of the present invention is obtained by molding the above-mentioned thermoplastic resin, and exceeds 0.1 mm ² , preferably 0.1 mm ² per 1 m ^{2 of} the sheet surface.
It does not include irregularities and / or discoloration having an area exceeding 5 mm ² , more preferably exceeding 1 mm ² .

[0038] When not include irregularities such as exceeding sheet surface 1 m ² per 0.1 mm ^2, improved container formability, is prevented from cracking during container molding occurs, better even container appearance.

In the thermoplastic resin composition sheet of the present invention, a resin coating layer can be further formed on at least one surface of the base sheet made of the thermoplastic resin composition. Alternatively, a thermoplastic resin excluding a styrene-based resin may be used.

The thickness of the coating layer is set such that the thickness of the base sheet is 100.
Is preferably 1 to 30, more preferably 1 to 20. When the thickness ratio is 1 or more, the coating layer forming operation is easy, and when the thickness ratio is 30 or less, the drawdown at the time of molding the container is performed smoothly, and the container falling crack and lowering of the waist are prevented.

The thermoplastic resin composition sheet of the present invention can have a foamed structure using the above-mentioned thermoplastic resin composition. However, in achieving the object of the present invention, the composition of the thermoplastic resin composition is a main component,
The foam structure itself is an additional element. When the thermoplastic resin composition sheet has a foamed structure, one of the following three requirements,
Preferably, 2 or 3 is provided.

(I) The expansion ratio is preferably from 1.1 to 20.
Times, more preferably 1.1 to 15 times (for example, 1.3 to 1
0 times), more preferably 1.5 to 8 times. The expansion ratio is 1.
When the ratio is 1 or more, the heat insulating property and the heat retaining property are enhanced, and when the ratio is 20 or less, the bulk is increased and the storage space is prevented from being increased.

(Ii) The average number of cell membranes per unit thickness is preferably 1 to 50 / mm. Average number of bubble films is 1 / mm
When it is above, the heat retention is enhanced, and when it is 50 pieces / mm or less, a decrease in impact strength is prevented. The average number of cell membranes was obtained by collecting ultrathin sections from the width direction of the sheet, counting the number of cell membranes observable with an optical microscope in the thickness direction, and converting the number per mm.

(Iii) The thickness of the sheet is preferably 0.2
To 2 mm, more preferably 0.3 to 2 mm (e.g.
5 to 2 mm), more preferably 0.5 to 1.5 mm, particularly preferably 0.7 to 1.3 mm. The thickness of the sheet is 0.
When it is 2 mm or more, the mechanical strength, stiffness, and heat retention of the container are increased, and when it is 2 mm or less, the moldability is reduced and the thickness of the container is not made uniform. In addition, the sheet thickness can be adjusted by the expansion ratio, the discharge amount of the extruder, the take-up speed of the take-off machine, the lip opening, and the like.

The thermoplastic resin composition sheet of the present invention may be laminated with a non-stretched film such as an olefin-based resin such as polypropylene and a polyester or polyamide printed with a pattern via an adhesive layer, if necessary. .

The thermoplastic resin composition sheet of the present invention is manufactured by using an extruder. At this time, the temperature of the resin at the exit of the T-die is adjusted by JIS K71 of the crystalline thermoplastic resin of the component (B).
A molding method can be applied by setting and maintaining the melting point (Tm) at a temperature lowering rate of 10 ° C./min 20 to 100 ° C., preferably 30 to 60 ° C.

Molding at a temperature 20 ° C. or more higher than the melting point (Tm) prevents the formation of projections, improves the extrusion stability, and prevents the occurrence of rust. Further, when molding is performed at a temperature higher than the melting point (Tm) of 100 ° C. or less, a large number of projections are generated on the sheet surface, which may cause poor appearance or breakage of the container, or a decrease in the molecular weight of the styrene resin, resulting in a decrease in the molecular weight of the styrene resin. The lowering of the waist is prevented.

In order to make the thermoplastic resin composition sheet of the present invention into a foamed structure, a conventional foaming agent may be foam-formed by an extruder. At this time, it is preferable to mix a nucleating agent in the thermoplastic resin composition in advance in order to adjust the number of cell membranes of the sheet. Examples of the nucleating agent include inorganic fine powders such as talc, silica, diatomaceous earth, clay, alumina, calcium carbonate, and barium sulfate. The amount of the nucleating agent
It can be selected according to the average number of bubble films.
The amount is preferably 0.1 to 10 parts by weight, more preferably 0.5 to 5 parts by weight, based on 0 parts by weight.

As a method of increasing the number of cell membranes and the expansion ratio, the screw shape of the extruder is made to have a high kneading property, for example, mixing such as a full flat screw with a mixing pin having a plurality of projections formed thereon. A method of cooling with a screw having a function or a T-die having a coolable structure can be applied.

The container of the present invention is obtained by molding the above-mentioned thermoplastic resin composition sheet, and is a prepared food container comprising a main body and a lid, a container having a lid such as a cup with a lid, a lid such as a tray and a cup. Includes any container without a. The container of the present invention can be used in various fields such as food containers and food containers for heating a microwave oven as heat-resistant and oil-resistant containers.

[0051]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. In the examples and comparative examples, the following components were used. (A) Component GPPS: General-purpose polystyrene (Daicel Chemical Industries, Ltd.)
HIPS: impact-resistant polystyrene (manufactured by Daicel Chemical Industries, Ltd., "Daisel Styrol S85", rubber content 8% by weight) SBS: styrene-butadiene block copolymer: Asahi Kasei Corporation ), "Tuffrene 126", styrene content 40% by weight) (B) component PP: polypropylene (manufactured by Grand Polymer Co., Ltd.)
“F109D”) PET: polyethylene terephthalate (Teijin Co., Ltd.,
"TRA") Compatibilizer Compatibilizer A: Styrene-ethylene-propylene-styrene copolymer (manufactured by Kuraray Co., Ltd., "Septon 2104") Compatibilizer B: Epoxy-modified styrene-butadiene copolymer (Daicel Chemical Co., Ltd.) Industrial Co., Ltd., “Epo Friend A10
20 ") Antioxidant Antioxidant A: phenolic antioxidant (Sumitomo Chemical,
"SUMILIZER GS") Antioxidant B: Phenolic antioxidant (Cirva Geigy, "Irganox 1076") Antioxidant C: Phosphoric acid antioxidant (Asahi Denka, "ADEKA STAB PEP-36") Dispersant : Calcium stearate, magnesium stearate Examples 1 to 9 and Comparative examples 1 to 5 [Ratios shown in Tables 1 and 2 [Components (A) and (B) are expressed in% by weight. Other components are expressed in parts by weight with respect to 100 parts by weight of components (A) and (B)].
After spreading an antioxidant with 0.1% by weight of mineral oil as a spreading agent, an extruder (screw diameter 65 mm, L / L
D = 32) and melt-kneaded while heating. At that time, the barrel temperature was set to 220 to 250 ° C., the cast and touch roll temperatures were set to 80 ° C., and a 600 mm wide sheet was extruded using a coat hanger die. The sheet having the coating layer is a multilayer extruder (screw diameter 65
mm, L / D = 32) and extruded by a feed block method. Each evaluation was performed by the following method about the obtained sheet or the container shape | molded therefrom. Table 1 shows the results.

Examples 10 and 11, Comparative Example 6 The components (A) and (B) shown in Tables 1 and 2 are expressed in terms of% by weight. Other components are expressed in parts by weight based on 100 parts by weight of components (A) and (B)].
After spreading a foaming agent (Cell Mike 623, manufactured by Sankyo Kasei Co., Ltd.) and an antioxidant using a weight% mineral oil as a spreading agent, supply them to an extruder and set the temperature of the cast and touch rolls to 40 ° C. A sheet was obtained in the same manner as in Examples 1 to 9 except that this was performed. Each evaluation was performed by the following method about the obtained sheet or the container shape | molded therefrom. Table 2 shows the results. <Evaluation method> (Presence or absence of adhesion to the lip of the extruder T-die and the sheet) The thermoplastic resin composition adhered to the lip of the T-die and the sheet during extrusion for 5 hours at a discharge rate of 100 kg / hour. The presence / absence of brown-colored skin was visually evaluated. ：: No adhesion Δ: Adhered to the entire surface of the lip of the T die but not to the sheet ×: Adhered to the entire surface of the lip of the T die and also adhered to the sheet surface (number of protrusions) Full width, length 10m range (6
m ² ), the number of projecting foreign substances exceeding 0.1 mm ² was visually measured, and the average number (pieces / m) was determined. B: less than 5 pieces / m (less than about 0.6 pieces / m ² ) Δ: less than 5 to 10 pieces / m (about 0.6 to about 1.7 pieces / m ²⁾
×: 10 pieces / m or more (about 1.7 pieces / m ² or more) (Container crack height) A single-shot vacuum forming machine manufactured by Asano Lab. A container was formed, 200 ml of water was put in the container, and the container was left at 0 ° C. for 12 hours. Then, the container is dropped on concrete, and 50% of the container is broken, and the height of the tear (cm) is measured according to JIS K540.
It was measured according to 0 and evaluated. ：: 40 cm or more Δ: 20 to less than 40 cm ×: less than 20 cm (Extrusion stability) Evaluation was made based on the difference in driving current value of the extruder and the sheet appearance. ：: The difference between the drive current value at the start of extrusion and the drive current value at the end of extrusion is within 5%, the sheet surface is smooth, and there is no coloring matter. ~ 1
Less than 0% and the surface of the sheet is rough. ×: The difference between the drive current values at the start and end of extrusion is 10%.
Above, the surface of the sheet is rough, and there is a coloring

[0053]

[Table 1]

[0054]

[Table 2]

[0055]

As described above, the thermoplastic resin composition sheet of the present invention comprises:
Since the appearance is smooth and beautiful, it is suitable for container production.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C08L 25/00 C08L 25/00 101/00 101/00 // B29K 7:00 B29K 7:00 101: 12 101: 12 105: 04 105: 04 F term (reference) 4F006 AA12 AA15 AA35 AA36 AA40 AB12 AB32 BA02 CA07 4F071 AA12X AA14 AA20 AA22 AA22X AA30 AA34X AA43 AA51 AA54 AA75 AA77 AF22 AF34 AF53 AH05 AB07 A13 AA08 A13 AA71 AA87 AG20 CA21 CA22 CA29 DA02 DA34 4F207 AA13 AB02 AB06 AB07 AB08 AG01 AG03 AG20 AH55 AH56 AH58 AM32 KA01 KA11 KK45 KL84 4J002 BB01X BB12X BC03W BC03X BC061 BC071 BC091 BE06X BG151 CN03 016151 BX01 BG151 CN01 FD206 GG01

Claims (9)

[Claims] 1. A (A) 5 to 95 wt% styrene-based resin and (B) is a sheet made of a thermoplastic resin composition containing 95 to 5% by weight crystalline thermoplastic resin, the sheet surface 1 m ² per 0 A thermoplastic resin composition sheet having no unevenness and / or discoloration having an area exceeding 1 mm ² . 2. The thermoplastic resin composition sheet according to claim 1, which contains at least one selected from a compatibilizer, a dispersant, an antioxidant and a heat stabilizer. 3. The composition according to claim 2, wherein the content of at least one selected from the group consisting of a compatibilizer, a dispersant, an antioxidant and a heat stabilizer is 0.01 to 20 parts by weight based on 100 parts by weight of the composition. Thermoplastic resin composition sheet. 4. The thermoplastic resin composition sheet according to claim 1, further comprising a resin coating layer on at least one surface of the base sheet. 5. The thermoplastic resin composition sheet according to claim 4, wherein the thickness ratio of the coating layer when the sheet thickness is 100 is 1 to 30. 6. The thermoplastic resin composition sheet according to claim 1, wherein the resin forming the coating layer is a styrene resin or a thermoplastic resin excluding the styrene resin. 7. One or more requirements selected from an expansion ratio of 1.1 to 20 times, an average number of cell membranes per unit thickness of 1 to 50 / mm, and a sheet thickness of 0.2 to 2 mm. The thermoplastic resin composition sheet according to any one of claims 1 to 6, wherein: 8. The method for producing a thermoplastic resin composition sheet according to claim 1, wherein the temperature of the resin at the exit of the T-die is decreased by 10 ° C. according to JIS K7121 of the crystalline thermoplastic resin. 20 to more than melting point (Tm)
A method for producing a thermoplastic resin composition sheet, comprising a step of forming a sheet while setting and maintaining the temperature to be higher by 100 ° C. 9. A container comprising the thermoplastic resin composition sheet according to any one of claims 1 to 7.