JP2018111505A - Heat insulation sheet and heat insulation container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulation sheet, excellent in scratch resistance on the surface of a heat insulation layer, and a heat insulation container with a thin and compact heat insulation layer, equipped with the heat insulation sheet.SOLUTION: A heat insulation sheet 1 has a thin base material 11 and a heat insulation layer 13, formed on at least one side of the thin base material 11. The heat insulation layer 13 is 200-1000 μm in thickness, consisting of two phases, i.e. a host phase containing a urethane resin with its glass-transition temperature at -70°C to -50°C and a dispersion phase, which is made of thermoplastic resin capsules with its average particle size 30 to 100 μm, dispersed in the host phase, and the content of the dispersion phase in the insulation layer 13 is 22 to 70 pts.mass relative to the dispersion phase 100 pts.mass as the host phase.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat insulating sheet including a thin base material and a heat insulating layer, and a heat insulating container in which the heat insulating sheet is bonded to an outer peripheral wall surface of a container base material.

  Conventionally, a heat insulating material or a heat insulating material has been widely used in the fields of building materials, electrical products, food, clothing, automobiles, etc., and as a sheet-shaped heat insulating material, a sheet having a closed cell made of polyolefin foam or the like, The sheet | seat provided with the coating layer which consists of a fabric etc. on the both surfaces side is used (refer patent document 1). Patent Document 2 discloses a heat insulating sheet used for forming a heat insulating paper container or the like, and this heat insulating sheet is hollow in an aqueous solution containing an acrylic resin on at least one side of a paper base material mainly made of pulp. It is described that it was obtained by using a coating composition in which hollow particles having a dispersion were dispersed. Further, in Patent Document 3, an acrylic coating agent in which thermally expandable microcapsules are dispersed on the surface of the base paper is applied and dried by heating, whereby the thermally expandable microcapsules are expanded on the base paper. A paper food container obtained by forming a heat insulating layer and bonding a resin film on the heat insulating layer is disclosed.

Special table 2009-540159 JP 2006-233386 A JP 2012-20715 A

  In recent years, due to problems such as disposal after use, for example, cup-type containers such as instant noodles and hot coffee, which are containers for food, are shifting from those made of foamed plastic to those made of paper. However, since the paper cup-type container does not have a sufficient heat insulating effect, it is necessary to increase the thickness, for example, to provide a space layer in order to obtain desired performance. A cup-type container having a thick part tends to be bulky by stacking, and the total number per unit volume by stacking is small (for example, when stacking 50 pieces, the height may be doubled or more). Therefore, there has been a problem that a large amount of transportation, a large amount of product manufacturing, etc. cannot be performed efficiently. Moreover, when the heat-expandable capsule and the acrylic resin are used in combination to form a heat insulating layer, the scratch resistance on the surface of the heat insulating layer is not sufficient, and in the manufacture of a heat insulating container using a sheet having such a heat insulating layer, Yield could be reduced.

  The subject of this invention is providing the heat insulation sheet which is excellent in the scratch resistance in the surface of a heat insulation layer in the sheet | seat provided with the thin base material and the heat insulation layer formed in the at least 1 surface side. Another object of the present invention is to provide a heat insulating container having a heat insulating layer that is thin and hardly bulky.

The present invention is shown below.
1. A thin substrate and a heat insulating layer formed on at least one surface of the thin substrate;
The heat insulation layer is composed of a mother phase containing a urethane resin having a glass transition temperature of −70 ° C. to −50 ° C., and a thermoplastic resin capsule having an average particle diameter of 30 to 100 μm dispersed in the mother phase. A layer including a dispersed phase and having a thickness of 200 to 1000 μm,
The content ratio of the dispersed phase in the heat insulation layer is 22 to 70 parts by mass with respect to 100 parts by mass of the parent phase.
2. Item 2. The heat insulating sheet according to Item 1, wherein the thin substrate is paper or film.
3. 3. A heat insulating container in which the heat insulating sheet according to item 1 or 2 is integrated with a container base having a trunk and a bottom, wherein the heat insulating layer of the heat insulating sheet is at least the body of the container base. A heat insulating container characterized by being bonded to the surface of the part.

According to the heat insulating sheet of the present invention, since the surface has excellent scratch resistance, it is suitable for the efficient production of a heat insulating material that is arranged and combined on the surfaces of various substrates.
Moreover, according to the heat insulation container of the present invention, since it has a specific structure and has a thin heat-resistant layer thinned to a thickness of 200 to 1000 μm, the total number per unit volume by stacking is small. It is useful for improving the efficiency of transportation and the like, and is suitable for mass production of products such as heated beverages and foods. Moreover, since it is excellent in the scratch resistance in the surface of a heat insulation layer, when it is set as the heat insulation container for foodstuffs, it can suppress that a foreign material mixes in a foodstuff.

It is a schematic sectional drawing which shows an example of a heat insulation sheet. 2 is an image showing a cross section of the heat insulating sheet obtained in Example 1. FIG. 2 is an image showing the surface of a heat insulating layer of a heat insulating sheet obtained in Example 1. FIG. 1 is a schematic cross-sectional view showing a resin container before manufacturing a heat insulating container in Example 1. FIG. 1 is a schematic cross-sectional view showing a heat insulating container obtained in Example 1. FIG.

  The heat insulation sheet of this invention is equipped with a thin base material and the heat insulation layer formed in the at least 1 surface side of this thin base material. FIG. 1 is an example of the heat insulating sheet 1 and shows the heat insulating sheet 1 in which the heat insulating layer 13 is disposed only on one surface side of the thin base material 11. Although not shown, the heat insulating layer 13 may be a heat insulating sheet provided on both sides of the thin base material 11. Further, FIG. 1 shows that the heat insulating layer 13 is formed on the entire surface of the one surface side of the thin base material 11, but is not limited to this, and the heat insulating layer 13 is formed of the thin base material 11 according to the application. It may be formed at a specific location on the surface of the film, and may be patterned by, for example, a linear shape, a dot shape, or a combination thereof. Moreover, although the thickness of the heat insulation layer 13 is made uniform in FIG. 1, it is not limited to this, You may have a convex part or a recessed part in the surface.

  In the present invention, the thin base material has an upper limit of 600 μm and a lower limit of preferably 10 μm, and has air permeability from one surface side to the other surface side, and does not have air permeability. Any of those (having barrier properties) may be used. The thin-walled substrate is preferably a single-layer body or a multilayer body composed of at least one of paper, film, nonwoven fabric, woven fabric, metal foil and the like, and particularly preferably paper and film. As for the said thin-walled base material, the surface on the side without a heat insulation layer may be decorated by printing, vapor deposition, etc.

  Next, the heat insulating layer has a mother phase containing a urethane resin having a glass transition temperature (hereinafter referred to as “Tg”) of −70 ° C. to −50 ° C., and an average particle size dispersed in the mother phase. And a dispersed phase composed of a thermoplastic resin capsule of 30 to 100 μm.

  From the viewpoint of scratch resistance on the surface of the heat insulating layer, the parent phase contains the urethane resin having a specific Tg, that is, −70 ° C. to −50 ° C., preferably −65 ° C. to −55 ° C. Depending on the case, other resins may be included.

  The urethane resin has, for example, a reaction of a urethane prepolymer raw material having a carboxyl group and an isocyanate group at a molecular terminal with a compound having a hydroxyl group and a polymerizable unsaturated bond, and the isocyanate group and the hydroxyl group. After obtaining a urethane prepolymer containing a urethane bond, a urethane prepolymer is dispersed in a liquid containing alcohol, water, a neutralizing agent and a chain extender, and a urethane having a polymerizable unsaturated bond at the molecular end. It is possible to obtain a resin obtained by producing a resin raw material and then polymerizing a polymerizable unsaturated bond.

The urethane prepolymer raw material can be obtained by reacting a diol having a carboxyl group, a polyol, and a polyisocyanate. Preferably, the equivalent of the isocyanate group is more than the total equivalent of the hydroxyl group. It was obtained.
Examples of the diol having a carboxyl group include α, α′-dimethylolalkanoic acid (glyceric acid, dimethylolpropionic acid, dimethylolbutanoic acid, 2,2-dimethylolpentanoic acid, etc.), dioxymaleic acid, dioxyfumaric acid, Examples include tartaric acid, 2,6-dioxybenzoic acid, 4,4-bis (hydroxyphenyl) valeric acid, 4,4-bis (hydroxyphenyl) butyric acid, and the like.
Polyols include polyether polyols such as polyethylene glycol, polypropylene glycol, and polyoxytetramethylene ether glycol obtained by ring-opening polymerization of ethylene oxide, propylene oxide, tetrahydrofuran, etc .; ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, octanediol, Saturated or unsaturated low molecular weight glycols such as 1,4-butynediol, dipropylene glycol, bisphenol A, hydrogenated bisphenol A, and adipic acid, maleic acid, fumaric acid Dehydration condensation with dibasic acids such as phthalic anhydride, isophthalic acid, terephthalic acid, succinic acid, oxalic acid, malonic acid, glutaric acid, pimelic acid, azelaic acid, sebacic acid, suberic acid or the corresponding acid anhydrides Polyester polyol obtained by reaction; polycarbonate polyol and the like.
Examples of polyisocyanates include diphenylmethane diisocyanate, crude diphenylmethane diisocyanate, tolylene diisocyanate, naphthalene diisocyanate, p-phenylene diisocyanate, xylene diisocyanate, tetramethylxylylene diisocyanate, and tolidine diisocyanate; hexamethylene diisocyanate, lysine diisocyanate, ricintri Aliphatic isocyanates such as isocyanates; Cycloaliphatic isocyanates such as isophorone diisocyanate, cyclohexyl diisocyanate, hydrogenated XDI, and hydrogenated MDI; Urethane modified products, dimers, trimers, carbodiimide modified products, and allophanates of the above isocyanate compounds Modified body, burette modified body, urea modified body, isocyanu Over preparative modified products, oxazolidone modified product, modified isocyanates such as isocyanate group-terminated prepolymer and the like.

  Thereafter, as a compound having a hydroxyl group and a polymerizable unsaturated bond to be reacted with the urethane prepolymer raw material, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate 2-hydroxy-3-phenoxypropyl (meth) acrylate, 2-hydroxy-3-acryloyloxypropyl (meth) acrylate, glycerol di (meth) acrylate, glycerol (meth) acrylate, trimethylolpropane diallyl ether, glycerol mono ( (Meth) acrylate, glycidol / acrylic acid adduct, pentaerythritol tri (meth) acrylate, pentaerythritol triallyl ether, 2-hydroxyethyl monovinyl ether, 4-hydroxybutyl mono Vinyl ether, N- methylol acrylamide, polypropylene glycol (meth) acrylate, polyethylene glycol (meth) acrylate, polycaprolactone (meth) acrylate, and the like. These are used in such a ratio that some isocyanate groups remain in the resulting urethane prepolymer.

  Next, the urethane prepolymer is mixed with alcohol such as ethanol, n-propanol, isopropyl alcohol, n-butanol, isobutyl alcohol, sec-butyl alcohol, tert-butyl alcohol, n-pentanol, sec-amyl alcohol; water; water Alkali metal hydroxides such as sodium oxide and potassium hydroxide, tertiary amines such as trimethylamine, triethylamine, triisopropylamine and tributylamine, triethanolamine, triisopropanolamine, N-alkyldiethanolamine, N, N'-dialkyl Alkanolamines such as monoethanolamine, N-alkyldiisopropanolamine, N, N′-dialkylmonoisopropanolamine, neutralizing agents such as ammonia; and ethylenediamine Aliphatic diamines such as propylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, isophoronediamine, dicyclohexylmethane-4,4′-diamine; 2-hydroxyethylethylenediamine, 2-hydroxyethylpropylenediamine, di-2-hydroxy Diamines having a hydroxyl group in the molecule such as ethylethylenediamine, di-2-hydroxyethylpropylenediamine, 2-hydroxypropylethylenediamine, di-2-hydroxypropylethylenediamine; alkylene dimers such as methylenedihydrazine, ethylenedihydrazine, propylenedihydrazine Hydrazine, adipic acid dihydrazide, oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, phthalic acid dihydrazide, Saturated or unsaturated dihydrazine such as diacid dihydrazide; Urethane having a polymerizable unsaturated bond at the molecular end by dispersing in a solution containing a chain extender such as dimeramine converted from dimer acid carboxyl group to amino group A resin raw material is produced.

  Thereafter, a polymerizable unsaturated bond of the urethane resin raw material is polymerized using a radical polymerization method or the like to obtain a high molecular weight urethane resin dispersion. The urethane resin contained in this dispersion liquid can be the main component of the matrix.

  The dispersed phase is made of a thermoplastic resin capsule having a specific size (hereinafter referred to as “resin capsule (C1)”). This resin capsule (C1) preferably has an inclusion substance (a gas, or a solid or liquid that is vaporized by heating) whose volume is increased by heating, inside an outer shell made of a thermoplastic resin material. The encapsulated particulate microcapsules (hereinafter referred to as “thermally expandable microcapsules”) are heated to a temperature of 80 ° C. to 150 ° C. and volume-expanded. The material constituting the outer shell of the resin capsule (C1) is acrylonitrile, methacrylonitrile, alkyl acrylate ester, alkyl methacrylate ester, vinyl chloride, vinylidene chloride, vinyl acetate, aromatic vinyl compound, acrylic acid, methacrylic acid. , Maleic acid, fumaric acid, itaconic acid, citraconic acid, acrylamide, substituted acrylamide, methacrylamide, substituted methacrylamide, and at least one polyfunctional compound having two or more polymerizable carbon-carbon unsaturated bonds It is preferable to contain a thermoplastic resin containing a structural unit derived from a seed. Examples of this thermoplastic resin include polyvinylidene chloride; vinylidene chloride / acrylonitrile copolymer, polyacrylonitrile, acrylonitrile / methacrylic acid alkyl ester copolymer, and other acrylonitrile-based (co) polymers; polymethyl methacrylate, etc. Acrylic (co) polymers such as polyvinyl chloride. Of these, acrylonitrile-based (co) polymers are particularly preferred. The outer shell of the resin capsule (C1) can contain additives such as a stabilizer, an ultraviolet absorber, an antioxidant, an antistatic agent and a flame retardant.

The resin capsule (C1) is a liquid compound having a boiling point (atmospheric pressure condition) equal to or lower than the softening temperature of the resin material constituting the outer shell, for example, n-butane, isobutane, cyclobutane, n-pentane, isopentane. , Cyclopentane, n-hexane, 2-methylpentane, 2,2-dimethylbutane, cyclohexane, n-heptane, cycloheptane, n-octane, cyclooctane, etc. hydrocarbons; C ₃ F ₇ OCH ₃ , C ₄ F Hydrofluoroether compounds such as ₉ OCH ₃ and C ₄ F ₉ OC ₂ H ₅ can be contained. The liquid compound may be only one type or two or more types. The liquid compound is preferably a hydrocarbon, and particularly preferably a low-boiling hydrocarbon having 4 to 5 carbon atoms.

  The average particle diameter (image analysis method) of the resin capsule (C1) is 30 to 100 μm, particularly preferably 50 to 80 μm, from the viewpoint of heat insulation.

  The content ratio of the dispersed phase composed of the resin capsule (C1) is 22 to 70 parts by mass, preferably 24 to 60 parts by mass, more preferably 26 to 50 parts by mass when the mother phase is 100 parts by mass. It is.

  The heat insulating layer may include another dispersed phase in the matrix phase. Other dispersed phases include resin capsules having an average particle size of less than 30 μm or more than 100 μm (hereinafter referred to as “resin capsule (C2)”), fillers, antioxidants, ultraviolet absorbers, stabilizers, flame retardants, electrification Examples thereof include an inhibitor, an antifungal agent, and a colorant. When the resin capsule (C2) is contained, the upper limit of the ratio is preferably 10% by mass when the total amount of the resin capsules (C1) and (C2) is 100% by mass.

  If the thickness of the heat insulation layer is at least 200 μm or more, sufficient heat insulation is obtained, and in the present invention, the upper limit is 1000 μm, preferably 300 to 800 μm. Thereby, for example, bulkiness of a shaped object such as a heat insulating container shown in FIG. 5 can be suppressed, and a decrease in the total number per unit volume due to stacking can also be suppressed.

  As described above, the heat-insulating sheet of the present invention can be provided with a heat-insulating layer on one side or both sides of the thin substrate, but in any case, the total thickness is preferably 200 to 2000 μm, more Preferably it is 300-1400 micrometers, More preferably, it is 400-1200 micrometers.

  When the heat insulating sheet of the present invention has the structure of FIG. 1, heat sealing is performed on at least a part of the surface (the lower surface of FIG. 1) of the thin base material 11 on the side opposite to the heat insulating layer 13 depending on its use and the like. Other layers such as an adhesive layer having an action such as pressure-sensitive adhesion can be further provided.

Although the method for producing the heat insulating sheet of the present invention is not particularly limited, a heat insulating layer forming material containing the specific urethane resin, the thermally expandable microcapsule, and a medium for dissolving or dispersing the urethane resin is thin-walled. After coating (entire coating or partial coating) on the surface of the substrate to form a coating film, the resultant coating film is heated to expand the thermally expandable microcapsules and to form a resin film. It is preferable. The method for applying the heat insulating layer forming material to the thin-walled substrate is not particularly limited. Usually, coating (dip coating, bar coating, roll coating, gravure, etc.) is performed according to the constituent material of the thin-walled substrate, the surface shape of the application part, etc. Coating, curtain coating, kiss coating, etc.), spray (airless spray, air spray, etc.), printing (gravure printing, screen printing, etc.), etc. are appropriately selected. In addition, although a thin base material can be made into paper, a film, etc., in order to improve the wettability etc. of the heat insulation layer forming material, you may give surface treatment beforehand as needed.
As another method for producing the heat insulating sheet of the present invention, the above heat insulating layer forming material is used to form a coating film on the surface of a peelable sheet or the like, and then the obtained coating film is heated to produce heat. Examples include a method in which the expandable microcapsule is volume-expanded to produce a single unit of the expanded capsule-containing urethane resin film, and then the single unit film is bonded to a thin substrate.

  The heat insulation container of the present invention is a heat insulation container in which the heat insulation sheet of the present invention and a base material for a container having a trunk and a bottom are integrated, and the heat insulation layer of the heat insulation sheet is formed of the container base material. It is characterized by being joined to at least the surface of the body part. FIG. 5 shows an example of the heat insulating container 50. As the container base material, the beverage resin container 30 of FIG. 4 is used, and the heat insulating layer 13 of the heat insulating sheet 1 of FIG. It is joined, and is provided with the trunk | drum 31, and the heat insulation packaging part 20 (it is set as thickness display in FIG. 5 for description) which consists of the heat insulation layer part 23 and the thin base material part 21. FIG. In addition, although not shown in figure, it can be set as the aspect by which the heat insulation layer 13 of the heat insulation sheet 1 was joined to the surface of the bottom part 33 further.

The said container base material shall be provided with a trunk | drum and a bottom part, and shall have shapes, such as cup shape like FIG. 4, tray shape which is not shown in figure, according to the contents accommodated and the objective to accommodate. It can be further provided with a lid as required. Any part may be made of the same material, or may be made of different materials. In particular, the body part and the bottom part are preferably a single-layer body or a multilayer body composed of at least one of paper, resin, foamed resin, metal, inorganic compound and the like having barrier properties.
The thickness of the trunk | drum and bottom part of the said base material for containers is not specifically limited, A minimum is 100 micrometers normally.

  The heat insulating container of the present invention is obtained by bonding a heat insulating sheet and a container base, and usually includes an adhesive layer derived from an adhesive (not shown). The adhesive is not particularly limited, but for example, an acrylic (co) polymer; AB type diblock copolymer such as styrene / isobutylene block copolymer, styrene / butadiene block copolymer, styrene / isoprene block copolymer, etc. Blends; including styrene / isobutylene / styrene block copolymer, styrene / butadiene / styrene block copolymer, ABA type triblock copolymer such as styrene / isoprene / styrene block copolymer, etc. Examples thereof include hot melt adhesives that can be spread-applied and exhibit tackiness and cohesion when cooled. This adhesive layer may be partially formed as long as the shape stability of the heat insulating container is obtained, or may be formed on the entire interface between the heat insulating sheet and the container base material.

The method for producing the heat insulating container of the present invention is not particularly limited, but the heat insulating sheet is processed into a shape corresponding to the surface (body part or bottom part) of the container base material, and an insulating agent is used to insulate the heat insulating sheet. It is preferable to manufacture the layer by attaching it to a predetermined position of the container base material. When using a heat insulating sheet in which an adhesive layer is formed in advance on the surface of the thin base material portion on the side opposite to the heat insulating layer, this heat insulating sheet may be attached to a predetermined position of the container base material as it is. .
As the heat insulation container of the present invention, for example, when the heat insulation container 50 of FIG. 5 is manufactured, the body of the beverage resin container 30 of FIG. 4 is processed so that the heat insulation sheet is processed to be the inner surface. After producing the cylindrical body which coat | covers 31, the method of adhere | attaching this cylindrical body and the base material for containers using an adhesive agent is mentioned.

  When a heat insulating sheet obtained by using a plain thin-walled base material having printability is bonded to the surface of the container base material, then, for the exposed thin-walled base part, By performing offset printing etc., it can be set as a decorated heat insulation container.

  Hereinafter, the present invention will be specifically described by way of examples. However, the present invention is not limited to these examples unless it exceeds the gist of the present invention.

1. Production raw material of heat insulation sheet The production raw material of the heat insulation sheet is as follows.

1-1. Base paper “Cup base paper non-coated product” (trade name) manufactured by Nippon Paper Industries Co., Ltd. was used. The thickness is 275 μm.

1-2. Heat insulation layer forming material Heat insulation layer formation materials (S1) to (S7) shown in Table 1 were prepared using the following raw materials (see Table 1).
(1) Aqueous polyurethane resin aqueous solution Polyurethane resin “Yuriano W321” (trade name) manufactured by Arakawa Chemical Co., which contains 35% by mass of polyurethane resin having a glass transition temperature of −60 ° C., 9% by mass of isopropyl alcohol and 56% by mass of water. Using.
(2) Aqueous dispersion of polyurethane resin Non-reactive polyurethane resin “Superflex E2000” (trade name) manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd. containing 50% by mass of polyurethane resin having a glass transition temperature of −38 ° C. and 50% by mass of water. Was used.
(3) Aqueous solution of acrylic resin An aqueous solution containing 40% by mass of an acrylic resin having a glass transition temperature of 21 ° C was used.
(4) Thermally expandable microcapsules Thermally expandable containing isobutane in the outer shell made of acrylonitrile / methacrylate copolymer, having an expansion start temperature of 90 ° C., and a particle diameter of 3 to 30 μm (average diameter of 10 μm) Microcapsules were used.
(5) Antifoaming agent A silicone compound was used.

2. Example 1 Production and Evaluation of Insulation Sheet and Insulation Container
The heat insulating layer forming material (S1) shown in Table 1 is applied to the above base paper by the bar coating method (the thickness of the coating film: 50 μm), and heated in the atmosphere at 140 ° C. for 60 to 90 seconds to dry the coating film. At the same time, the thermally expandable microcapsules were expanded to obtain a heat insulating sheet having a film (heat insulating layer) having a thickness of 445 to 505 μm (see FIG. 2). Then, the surface of this heat insulation sheet was observed with an electron microscope, and it was confirmed that the coating contained expanded capsules having an average diameter of 65 μm calculated as n = 10 (see FIG. 3). And in order to evaluate the scratch resistance in the surface of a heat insulation layer, when the nail | claw test which makes a fingernail stand and reciprocates 50 mm length 10 times was performed, the scraps did not generate | occur | produce.
Next, hot melt bonding is applied to the surface of the body of a cup-shaped polypropylene resin container (commercially available) 30 having a general shape shown in FIG. 4 and an inner volume of 200 mL with a thickness of the container body 31 of 200 μm. An insulating agent was applied, and the heat insulating sheet 20 was bonded so that the heat insulating layer 23 side adhered, thereby manufacturing a heat insulating container 50 for a heated beverage (see FIG. 5). And in order to evaluate heat insulation, hot water (93 degreeC) is poured into this heat insulation container 50, and the thin base material part (base paper part) of the moment which became the quantity (about 180 mL) equivalent to about 90% of the said internal volume ) The surface temperature of 21 was measured with a radiation thermometer and found to be 71.7 ° C. (see Table 2). In addition, when hot water (93 degreeC) was poured into the container 30 made from a polypropylene resin before bonding the heat insulation sheet 20, and the temperature of the trunk | drum surface was measured, it was 89.7 degreeC. Further, when 50 of the heat insulating containers 50 are stacked, the thickness of the heat insulating sheet 20 is as thin as 720 to 780 μm, so that it is about 1.2 times higher than when 50 polypropylene resin containers 30 are stacked. As a result, stacking was excellent.

Example 2
A heat insulating sheet and a heat insulating container were produced and evaluated in the same manner as in Example 1 except that the heat insulating layer forming material (S2) was used instead of the heat insulating layer forming material (S1) (see Table 2). ).

Example 3
A heat insulating sheet and a heat insulating container were manufactured and evaluated in the same manner as in Example 1 except that the heat insulating layer forming material (S3) was used instead of the heat insulating layer forming material (S1) (see Table 2). ).

Example 4
A heat insulating sheet and a heat insulating container were produced and evaluated in the same manner as in Example 1 except that the heat insulating layer forming material (S4) was used instead of the heat insulating layer forming material (S1) (see Table 2). ).

Example 5
A heat insulating sheet and a heat insulating container were produced and evaluated in the same manner as in Example 1 except that the heat insulating layer forming material (S5) was used instead of the heat insulating layer forming material (S1) (see Table 2). ).

Comparative Example 1
A heat insulating sheet and a heat insulating container were produced and evaluated in the same manner as in Example 1 except that the heat insulating layer forming material (S6) was used instead of the heat insulating layer forming material (S1) (see Table 2). ). In the scratch test on the surface of the heat insulating layer, fine debris was generated.

Comparative Example 2
A heat insulating sheet and a heat insulating container were produced and evaluated in the same manner as in Example 1 except that the heat insulating layer forming material (S7) was used instead of the heat insulating layer forming material (S1) (see Table 2). ). In scratching the surface of the heat insulating layer, the layer was peeled off.

  As mentioned above, Examples 1-5 give the heat insulation sheet which is excellent in the scratch resistance in the surface of a heat insulation layer, is excellent in heat insulation, and gives the heat insulation container which is hard to be bulky.

  In addition, in this invention, it can restrict to what is shown to said specific Example, It can be set as the Example variously changed within the range of this invention according to the objective and the use.

The heat insulating sheet of the present invention is excellent in heat insulating effect with respect to a temperature in the range of −40 ° C. to 100 ° C., for example, so that it is used for building materials, electrical products (refrigerators, heat insulation boxes, etc.), food (heated or heated). Can be widely used in the fields of beverages or food containers, clothing, automobiles and the like. In particular, since it is a thin sheet, when it is manufactured while being stacked in the same shape, stored or transported, it does not become bulky, so that the total number per unit volume can be reduced. . Also, because of its excellent heat insulation properties, the type of thin base material is selected according to the shape, size, etc. of the object having a predetermined temperature, the heat insulating sheet is bent or processed into a cylindrical shape, It is also possible to place a support on the material side. And when processing the target object which has the same shape, size, etc. in large quantities, the usage which pinches | interposes a target object using multiple sheets of heat insulation sheets which have a heat insulation layer on both surfaces is also possible.
In addition, the heat insulating container of the present invention is suitable as a container for containing a heated or heated beverage or food (immediate noodles, prepared dishes, etc.), and the base material for the container is, for example, a polypropylene resin or the like When it consists of a heat-resistant material, this heat insulation container can also be used as a container for heating the contents with a microwave oven.

  1: heat insulation sheet, 11: thin base material, 13: heat insulation layer, 20: heat insulation packaging part, 21: thin base material part, 23: heat insulation layer part, 30: resin container, 31: container body part, 33: container Bottom, 35: Mouth, 50: Insulated container

Claims (3)

A thin substrate and a heat insulating layer formed on at least one surface of the thin substrate;
The heat insulation layer is composed of a mother phase containing a urethane resin having a glass transition temperature of −70 ° C. to −50 ° C., and a thermoplastic resin capsule having an average particle diameter of 30 to 100 μm dispersed in the mother phase. A layer including a dispersed phase and having a thickness of 200 to 1000 μm,
The content ratio of the dispersed phase in the heat insulation layer is 22 to 70 parts by mass with respect to 100 parts by mass of the parent phase.   The heat insulating sheet according to claim 1, wherein the thin substrate is paper or film.   A heat insulating container in which the heat insulating sheet according to claim 1 and a container base material including a body portion and a bottom portion are integrated, wherein the heat insulating layer of the heat insulating sheet is at least the body of the container base material. A heat insulating container characterized by being bonded to the surface of the part.