WO2004014992A1 - 発泡性スチレン系樹脂粒子、およびこれを用いた予備発泡粒子、発泡成形体 - Google Patents
発泡性スチレン系樹脂粒子、およびこれを用いた予備発泡粒子、発泡成形体 Download PDFInfo
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- WO2004014992A1 WO2004014992A1 PCT/JP2003/002614 JP0302614W WO2004014992A1 WO 2004014992 A1 WO2004014992 A1 WO 2004014992A1 JP 0302614 W JP0302614 W JP 0302614W WO 2004014992 A1 WO2004014992 A1 WO 2004014992A1
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- styrene resin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/22—After-treatment of expandable particles; Forming foamed products
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/224—Surface treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/16—Making expandable particles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2325/00—Characterised by the use 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; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
Definitions
- the present invention relates to expandable styrene resin particles. More specifically, when prefoamed and then molded to form a foamed molded article, an expandable styrenic resin capable of remarkably suppressing the penetration of contents contained in the foamed molded article to the outside.
- the present invention relates to expandable styrene resin particles which are particles and are less likely to cause mold contamination even when foamed articles such as food containers are continuously molded.
- foamed molded articles made from expandable styrene resin particles are excellent in economy, light weight, heat insulation, strength, and hygiene, and are used for food containers, cushioning materials, heat insulation materials, and the like.
- a food container for example, it is suitable as a container for instant food, fried chicken, caramel, coffee and the like.
- the expandable styrene-based resin particles are heated by steam, hot air, or the like, a large number of air bubbles are generated in the particles, and the expanded styrene resin particles become pre-expanded particles.
- the pre-expanded particles are filled in a mold having a desired shape and heated by steam, the pre-expanded particles are fused to each other to obtain a foam molded article.
- the particles are fused together to form a shape according to the mold.However, since the particles are not completely integrated, fine particles are formed on the particle fusion surface. There are various capillaries. Therefore, for example, when the foamed molded article is used as a container, depending on the type of the contained contents, There is a risk that the components of the contents may penetrate into the container wall, and may also penetrate to the outside through the container wall. In particular, when the content to be contained is high in fats and oils, for example, when the content of fats and oils is 30% by weight or more such as Carrele II, the components of the content penetrate into the container wall, Furthermore, there is a high possibility that the water will penetrate to the outside through the container wall. In addition, when stored and transported under severe conditions such as high temperatures, the risk of penetration becomes significant.
- Patent Document 1 proposes a method using isopentane as a blowing agent.
- the target content of this method is coffee, it is possible to substantially prevent coffee infiltration while pouring coffee and drinking it. It has been difficult to prevent penetration of highly permeable contents, such as aqueous solutions containing activators. It is known that if it is possible to prevent the penetration of the surfactant solution, it is possible to substantially prevent the penetration of a wide range of contents including fats and oils. Permeation tests are used as one test method to evaluate permeation prevention.
- Patent Document 2 Japanese Patent Application Laid-Open No. 60-26442
- Patent Document 2 As a measure for preventing permeation of fats and oils or regular coffee, zinc stearate having a particle size of 90% or less within 10 / m or less is used.
- a method of coating the surface of expandable thermoplastic resin particles with a nonionic cellulose ether has been proposed.
- Patent Document 3 discloses a fluorine-based polymer as a method for preventing the penetration of highly permeable contents including a surfactant solution.
- a method of coating the surface of expandable styrene-based resin particles with the above method By using this method, it is possible to suppress the penetration of the surfactant solution, but it is disadvantageous in terms of cost because the fluoropolymer is very expensive, and the melting of the pre-expanded particles at the time of molding. Due to the tendency to inhibit adhesion, there is a problem that the mechanical strength of the obtained molded body may be reduced unless the molding conditions are carefully controlled.
- a higher fatty acid is an essential component as a fourth component in addition to a higher fatty acid bisamide, zinc stearate, and a metal salt of a higher fatty acid other than zinc stearate.
- the second component other than the higher fatty acid amide, which is not used in the present invention is an essential component.
- Patent Document 7 Japanese Patent Application Laid-Open No. 5-20981
- the agglomeration of the pre-expanded particles is prevented, and the particle surface is prevented from being damaged when the particles are sieved.
- fatty acid bisamide is coated on the surface of expandable styrene resin particles instead of zinc stearate, which is conventionally used as a component to be used, but the contents contained in a container penetrate to the outside. No mention was made of preventing the occurrence of water leakage, and in fact, it was difficult to prevent the contents contained in the container from penetrating to the outside using only fatty acid bisamide.
- Patent document 1 US Pat. No. 4,840,759
- Patent Document 2 JP-A-60-26042
- Patent Document 3 JP-A-11-322995
- Patent Document 4 JP-A-55-127441
- Patent Document 5 JP-A-61-157538
- Patent Document 6 JP-A-56-106930
- Patent Document 7 JP-A-5-209081 DISCLOSURE OF THE INVENTION
- the present invention significantly suppresses infiltration of the contents contained in the foamed molded product to the outside when prefoamed and then molded to form a foamed molded product.
- the present invention provides the following expandable styrenic resin particles, pre-expanded particles, and expanded molded articles.
- foamable polystyrene resin particles containing 5% by weight and having a styrene monomer content of 1000 ppm or less have a fatty acid sodium content of 0.1% by weight or less based on 100 parts by weight of the resin particles.
- Expandable polystyrene resin particles containing a volatile volatile foaming agent and having a styrene monomer content of 1000 ppm or less are expressed by the following general formula (1) with respect to 100 parts by weight of the resin particles.
- Foamable styrenic resin particles characterized by being coated with 0.5 parts by weight and 0.2 to 0.5 parts by weight of a fatty acid metal salt.
- R 2 and R 3 are saturated or unsaturated aliphatic hydrocarbon groups
- R 4 is a divalent aliphatic hydrocarbon group or aromatic hydrocarbon group, provided that R 2 and R 3 are the same or different. May be
- a foaming agent containing 3 to 5.5% by weight of a volatile volatile blowing agent containing 15 to 60% by weight of isopentane and having a styrene monomer content of 1000 ppm or less.
- the content of the fatty acid sodium is 0.1% by weight or less based on 100 parts by weight of the reactive polystyrene resin particles.
- the present invention provides expandable styrene-based resin particles characterized by being coated with 0.2 to 0.5 parts by weight of zinc stearate below (this invention is hereinafter referred to as a first invention).
- styrene-based resin particles used for food containers and the like having a styrene-based monomer content of 100 ppm or less
- An expandable styrene-based resin particle is produced by adding an easily volatile foaming agent containing 15 to 60% by weight of isopentane, and the surface of the particle is added with zinc stearate in an amount of 0.1 part by weight to 100 parts by weight of the resin particle.
- the foamed styrene-based resin particles coated with 2 to 0.5 parts by weight are pre-foamed and molded, so that the obtained foamed molded article has a performance of substantially preventing penetration of a surfactant solution. It is excellent, that is, because it can prevent a wide range of contents including oils and fats from penetrating to the outside, it has excellent performance as a container for contents containing the oils and fats and a food container such as a hot water container. To demonstrate .
- the amount of zinc stearate that coats the expandable styrene resin particles for the purpose of preventing permeation is usually larger than the amount that is coated for the purpose of preventing agglomeration. It was found that foaming of expandable styrenic resin particles coated with a large amount of zinc stearate tends to increase the degree of mold contamination, and intensive studies were conducted to solve the problem of mold contamination. As a result, by using zinc stearate having a content of fatty acid sodium as an impurity of 0.1% by weight or less as the zinc stearate used for coating, a foamed molded product such as a food container can be continuously formed. However, it was surprisingly found that the mold surface was not stained black.
- the styrene-based resin particles in the first invention are generally known styrene-based resin granules containing styrene as a main component, and a homopolymer of styrene, such as styrene-methyl styrene, para-methyl styrene, One pt.
- Styrene derivatives such as styrene and chlorostyrene, methyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, methacrylate, and other acrylic acid and esters of methacrylic acid, or acrylonitrile, dimethyl fumarate
- a copolymer of styrene with various monomers such as ethyl maleate may be used.
- a bifunctional monomer such as divinylbenzene or alkylendilicol dimethacrylate may be used in combination.
- styrene and a styrene-based derivative are collectively referred to as a styrene-based monomer.
- the styrene resin those having a weight average molecular weight of 150,000 to 400,000, preferably 250,000 to 350,000, which can be generally used as expanded polystyrene, can be used.
- the styrene-based resin particles in the first invention are impregnated into the styrene-based resin seed particles dispersed in an aqueous suspension by adding a styrene-based monomer such as styrene to the seed particles.
- a polymer produced by a so-called suspension seed polymerization method in which polymerization is carried out can be used.
- the resin seed particles used in the suspension-side polymerization method include (1) a normal suspension polymerization method, and (2) a polymerizable monomer which is passed through a nozzle under regular vibration to form an aqueous medium as droplets. And polymerizing without causing coalescence and additional dispersion.
- Expandable styrene resin particles can be obtained by adding an easily volatile blowing agent described below during the polymerization step of the styrene resin particles or after the polymerization step is completed.
- the amount of the styrene monomer contained in the expandable styrene resin particles in the first invention is 100 ppm. (Weight basis) It is necessary to keep it below.
- the amount of styrene-based monomer remaining in the container is set to 100,000 according to the hot water container standard specified in the Food Sanitation Law. ppm or less It is because it is prescribed in.
- the amount of the styrene monomer in the expandable styrene resin particles is preferably 500 ppm or less, and more preferably 20 ppm or less. It is preferable that the flow rate is less than 500 ppm because odor is reduced.
- a so-called 1,1,1-bis (t_butyl veroxy) -3,3,5-trimethylcyclohexane or the like is used as a method of reducing the amount of residual styrene monomer contained in the expandable styrene resin particles to 1000 ppm or less.
- a method in which a high-temperature decomposition type polymerization initiator is used in an amount of 0.05 part by weight or more based on 100 parts by weight of the polymerizable monomer, and post-polymerization is performed at a high temperature of 110 ° C. or more is used.
- the hot water container standard stipulated in the Food Sanitation Law specifies that the residual amount of styrene-based monomer is 1000 ppm or less, and that the residual amount of ethylbenzene is 1000 ppm or less, and that styrene, toluene, ethylbenzene, and isopropyl
- the total remaining amount of benzene and normal propylbenzene is specified to be less than 2000 ppm.
- the particle size of the expandable styrene resin particles (hereafter referred to as expandable styrene resin particles before being coated with zinc stearate) in the first invention is 0.2 when used for food containers and the like. It is preferably between 0.6 and 0.6 mm. If the particle diameter is less than 0.2 mm, the escape speed of the volatile volatile agent is too fast to shorten the bead life, while if it is more than 0.6 mm, the wall thickness of general food containers is around 2 mm. Because of the thinness, the filling property of the mold becomes poor.
- particles obtained by a usual suspension polymerization method may be classified, or the suspension seed polymerization method described above may be used. Is also good. It is preferable to use the suspension seed polymerization method because a higher yield can be obtained.
- the readily volatile foaming agent contained in the expandable styrene resin particles contains 15 to 60% by weight of isopentane. And preferably 30 to 60 % By weight, more preferably 35 to 55% by weight, most preferably 35 to 50% by weight.
- the content of the volatile foaming agent other than isopentane is 85 to 40% by weight, preferably 70 to 40% by weight, more preferably 65 to 45% by weight, and most preferably 65 to 5% by weight. 0% by weight. If the content of isopentane is less than the above range, there is a tendency that the penetration of highly permeable contents such as a surfactant solution cannot be sufficiently prevented. It tends to impair beauty.
- volatile volatile foaming agents other than isopentane include aliphatic hydrocarbons such as propane, normal butane, isobutane, normal pentane, neopentane, and normal hexane; and cycloaliphatic carbons such as cyclobutane, cyclopentane, and cyclohexane. Hydrogen and the like.
- isopentane and normal pentane in combination as the readily volatile foaming agent, and if necessary, normal butane, isobutane and propane may be used in combination.
- the composition of these volatile foaming agents is preferably 15 to 60% by weight of isopentane, 85 to 40% by weight of normal pentane, normal butane and / or isobutane (hereinafter, referred to as the total amount of the volatile foaming agent).
- butane may be simply abbreviated as butane
- Z or propane 0 to 20% by weight more preferably 30 to 60% by weight of isopentane, 70 to 40% by weight of normal pentane, butane and Z Or 0 to 20% by weight of propane, particularly preferably 35 to 55% by weight of isopentane, 65 to 45% by weight of normal pentane, 0 to 20% by weight of butane and Z or propane, most preferably isopentane 3 5 to 50% by weight, n-malpentane 65 to 50% by weight, butane and Z or propane 0 to 20% by weight.
- the content of the volatile volatile blowing agent in the expandable styrene resin particles (here, the expandable styrene resin particles before the coating treatment) of the first invention is 3 to 5.5% by weight. It is preferably from 3.3 to 5.0% by weight, particularly preferably from 3.5 to 4.5% by weight. If the content of the readily volatile foaming agent is less than the above range, the fusion rate at the time of molding tends to decrease, and the strength of the foamed molded article tends to decrease. There is a tendency for the particle gap to increase and the surface aesthetics to be impaired.
- These blowing agents may be added during the polymerization step of the styrene resin particles, or may be added after the polymerization step.
- liquid paraffin may be used as a plasticizer in order to shorten the pre-expansion time of the expandable styrene resin particles.
- liquid paraffin is registered as a food additive and can be used with confidence.
- the content of the liquid paraffin in the expandable styrene resin particles is 0.0 with respect to 100 parts by weight of the expandable styrene resin particles (here, the expandable styrene resin particles before the coating treatment).
- the amount is preferably from 5 to 1 part by weight, and if the amount is less than 0.05 part by weight, the pre-expansion time is hardly reduced. It is not preferable because sticking occurs.
- the amount of zinc stearate used is less than 0.2 part by weight, the penetration of the surfactant solution tends to be unable to be sufficiently suppressed, and if it exceeds 0.5 part by weight, the fusion during molding becomes insufficient and the foamed molded article Strength tends to decrease.
- the amount of zinc stearate used is preferably 0.25 to 0.45 parts by weight, more preferably 0.3 to 0.3 parts by weight based on 100 parts by weight of the expandable styrene resin particles. 4 parts by weight.
- the commercially available fatty acid constituting zinc stearate is a mixture of stearic acid as a main component and palmitic acid, myristic acid, lauric acid, arachinic acid, behenic acid, etc.
- Such a commercially available product can be used as zinc oxynitride.
- the content of sodium fatty acid contained in the zinc stearate used in the present invention is 0.1% by weight or less, preferably 0.08% by weight or less, more preferably 0.05% by weight or less. You. If the content of the fatty acid sodium exceeds the above range, the surface of the molding die is stained black when continuously producing a foamed molded product such as a food container, which causes insufficient fusion and demolding due to poor heat transfer. Tend.
- the fatty acid sodium contained in the zinc stearate is greatly affected, so that it is extremely difficult to control the content of the fatty acid sodium. Get good results.
- the particle size of the zinc stearate used in the first invention is not particularly limited. Usually, zinc stearate having an average particle diameter of 8 to 15 am, preferably 10 to 13 m is used from the viewpoint of easy coating treatment. Of course, even if the particle size is larger or smaller, the desired effect can be exhibited. Examples of a method of coating or adhering zinc stearate on the surface of the expandable styrene resin particles include a method of mixing both of them in a mixer such as a Henschel mixer for a certain period of time. In the first invention, a state in which zinc stearate is present in some form by coating or adhering to the surface of the expandable styrene-based resin particles is referred to as coating.
- additives having a fusion promoting effect at the time of molding can be used.
- higher fatty acid amides such as stearic acid amide, higher fatty acid glycerides such as hardened castor oil and hardened soybean oil, and the like can be used. No.
- glycerin polyethylene glycol, polypropylene glycol, fatty acid monodaliseride, etc., which are commonly used as antistatic agents
- One or two or more of them can be used in combination. Among them, it is preferable to use polyethylene glycol.
- pre-expanded granules having a bulk density of about 90 to 120 g / L can be obtained by heating at about 80 to 110 using steam in a rotary stirring type pre-foaming device. Further, the obtained pre-expanded foamed particles are filled in a mold having a desired shape, and heated at about 130 to 144 ° C. using steam or the like to obtain a foamed molded article.
- the foamed molded article formed from the expandable styrene resin particles of the first invention includes instant, carrelle ⁇ , instant ⁇ ⁇ ⁇ with carrelle ⁇ added, stew, mayonnaise, margarine, donut, hamburger, fried chicken. It is suitably used as a food container for coffee, etc.
- expandable polystyrene-based resin particles containing an easily volatile foaming agent and having a styrene-based monomer content of 100 ppm or less are used.
- Expandable styrene resin particles characterized by being coated with at least one type of 0.01 to 0.5 part by weight and a fatty acid metal salt of 0.2 to 0.5 part by weight hereinafter referred to as “the styrene resin particles”. This invention is referred to as a second invention).
- R 1 is a saturated or unsaturated aliphatic hydrocarbon group
- R 2 and R 3 are saturated or unsaturated aliphatic hydrocarbon groups
- R 4 is a divalent aliphatic hydrocarbon group or aromatic hydrocarbon group, provided that R 2 and R 3 are the same or different. May be
- the present inventors have conducted further intensive studies on the basis of the first invention, and found that an expandable styrene-based material coated with a combination of a fatty acid metal salt represented by zinc stearate and a fatty acid amide and / or a fatty acid bisamide was used.
- Foamed products such as food containers, which are obtained by pre-foaming and then foaming resin particles, contain not only a surfactant solution but also a high oil and fat content and a stronger penetration force. They discovered that it was completely unexpected that the permeation of the contents could be substantially prevented even when stored and transported under severe conditions such as high temperature as a container for goods.
- styrene resin particles in the second invention those similar to the styrene resin particles in the first invention can be used.
- the same rules as in the first invention apply to the weight average molecular weight (preferably 150,000 to 400,000, more preferably 250,000 to 350,000), polymerization method (suspension polymerization method, suspension seed polymerization method), and the like. Wear. Residual styrenic monomer content for expandable styrenic resin particles
- volatile volatile blowing agent used in the second invention examples include aliphatic hydrocarbons such as propane, normal butane, isobutane, normal pentane, isopentane, neopentane, and normal hexane, cyclobutane, cyclopentane, and cyclohexane. Alicyclic hydrocarbons, etc. These may be used alone or in combination of two or more.
- expandable styrene resin particles before coating with fatty acid amide and Z or fatty acid bis amide and fatty acid metal salt described below Is preferably 3 to 6% by weight, more preferably 3 to 5.5% by weight, particularly preferably 3.5 to 5.5% by weight, and most preferably 4.0 to 5.0% by weight. It is. If the content of the volatile foaming agent is less than the above range, the fusion ratio at the time of molding tends to decrease and the strength of the foamed molded article tends to decrease. Tend to increase the surface quality.
- foaming agents may be added during the polymerization step of the expandable styrene resin particles, or may be added after the polymerization step.
- the readily volatile foaming agent contained in the expandable styrene resin particles contains 15 to 60% by weight of isopentane. It is preferably contained in an amount of 30 to 60% by weight, particularly preferably 35 to 55% by weight, and most preferably 35 to 50% by weight.
- the content of the readily volatile blowing agent other than isopentane is preferably 85 to 40% by weight, more preferably 70 to 40% by weight, particularly preferably 65 to 45% by weight, and most preferably. Is 65 to 50% by weight.
- isopentane and normal benzene in combination as the readily volatile foaming agent, and if necessary, normal butane, isobutane and propane may be used in combination.
- the composition of these volatile foaming agents is preferably 15 to 60% by weight of isopentane, 85 to 40% by weight of normal pentane, normal butane and Z or isobutane (hereinafter referred to as the total amount of the volatile volatile agent).
- butane may be simply abbreviated as butane
- propane more preferably 30 to 60% by weight of isopentane, 70 to 40% by weight of normal pentane, butane and 0 to 20% by weight of Z or propane, particularly preferably 35 to 55% by weight of isopentane, 65 to 45% by weight of normal pentane, butane and 0 to 20% by weight of Z or propane, most preferably isopentane 35 to 50% by weight, normal pentane 65 to 50% by weight, butane and / or propane 0 to 20% by weight.
- a fatty acid amide represented by the general formula (1) and _ or a fatty acid bisamide represented by the general formula (2) are used.
- R 1 is a saturated or unsaturated aliphatic hydrocarbon group
- R 2 and R 3 are saturated or unsaturated aliphatic hydrocarbon groups
- R 4 is a divalent aliphatic hydrocarbon group or aromatic hydrocarbon group, provided that R 2 and R 3 are the same or different. May be
- the saturated or unsaturated aliphatic hydrocarbon groups represented by RR 2 and R 3 are preferably those having 7 to 23 carbon atoms, and those having 15 to 21 carbon atoms. Are more preferable, and those having 17 carbon atoms are particularly preferable.
- the saturated or unsaturated aliphatic hydrocarbon group represented by RR 2 or R 3 may have a substituent such as a hydroxyl group.
- Specific examples of fatty acids that provide R 1 —CO—, R 2 —CO—, and R 3 —CO— groups include, for example, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, and stearic acid.
- 12-hydroxystearic acid arachinic acid, behenic acid, lignoceric acid, obsuccinic acid, dyproleic acid, lindelic acid, zzudic acid, fizetelic acid, zomaric acid, oleic acid, petroselinic acid, gadoleic acid, eric acid, Seracoleic acid, linoleic acid, linolenic acid, ricinoleic acid and the like can be mentioned.
- the divalent aliphatic hydrocarbon group represented by R 4 preferably has 1 to 8 carbon atoms, and the divalent aromatic hydrocarbon group has 6 to 8 carbon atoms. preferable.
- Specific examples of the divalent aliphatic hydrocarbon group represented by 4 include, for example, methylene, ethylene, 1, limethylene, propylene, tetramethylene, butylene, pentamethylene, hexamethylene, and heptamethine. Tylene, octamethylene and the like.
- Specific examples of the divalent aromatic hydrocarbon group represented by R 4 include, for example, phenylene, tolylene, xylylene and the like.
- Examples of the fatty acid amide represented by the general formula (1) include, for example, caprylic amide, capric amide, lauric amide, myristic amide, palmitic amide, stearic amide, arakinic amide, and behenic amide And lignoceric acid amide, 12-hydroxystearic acid amide, oleic acid amide, erlic acid amide, ricinoleic acid amide and the like.
- the fatty acid bisamide represented by the general formula (2) is a diamide of diamine and a fatty acid, and the two fatty acids forming two amide bonds may be the same or different. That is, the aliphatic hydrocarbon groups R 2 and R 3 in the general formula (2) may be the same or different.
- a fatty acid bis amide rather than a fatty acid amide.
- fatty acid amides and fatty acid bisamides it is preferable to use stearic acid amide and Z or ethylene bisstearic acid amide, and among them, it is most preferable to use ethylene bisstearic acid amide alone.
- the amount of the fatty acid amide and / or the fatty acid bis amide used in the second invention is 0.00 parts by weight based on 100 parts by weight of the expandable styrene resin particles (here, the expandable styrene resin particles before the coating treatment). It is 0.1 to 0.5 part by weight, preferably 0.05 to 0.3 part by weight, and more preferably 0.1 to 0.25 part by weight. If the amount of the fatty acid amide and Z or the fatty acid bisamide is less than the above range, the effect of suppressing the penetration of the contents of food containers such as oils and fats tends to be small. Adhesion deteriorates and the molding cycle tends to become longer.
- a fatty acid metal salt is used in addition to the fatty acid amide and Z or the fatty acid bisamide.
- the fatty acid metal salt examples include long-chain fatty acid metal salts such as zinc stearate, calcium stearate, magnesium stearate, aluminum stearate, zinc laurate, and calcium laurate. Among them, it is particularly preferable to use zinc stearate.
- the fatty acid constituting zinc stearate which is commercially available is a mixture of stearic acid as a main component and palmitic acid, myristic acid, lauric acid, araquinic acid, behenic acid, and the like. Zinc acid is like this Commercially available products can be used.
- the fatty acid metal salt (preferably zinc stearate) used in the second invention has a sodium fatty acid content of 0.1% by weight. % Or less, more preferably 0.08% by weight or less, and particularly preferably 0.05% by weight or less.
- Particularly preferred are fatty acid metal salts (preferably zinc stearate) produced by a direct method.
- the amount of the fatty acid metal salt (preferably zinc stearate) used is 0 parts by weight based on 100 parts by weight of the expandable styrene resin particles (here, the expandable styrene resin particles before the coating treatment). 0.2 to 0.5 part by weight is preferred, 0.2 to 0.45 part by weight is more preferred, and 0.3 to 0.4 part by weight is particularly preferred. ⁇ Fatty acid metal salt (preferably zinc stearate) If the amount used falls below the above range, the effect of preventing penetration of food container contents containing a large amount of oils and fats tends to decrease, while if the amount exceeds the above range, fusion during molding is insufficient and strength is reduced. Tend to.
- the particle size of the fatty acid metal salt used in the second invention is not particularly limited. Usually, zinc stearate having an average particle diameter of 8 to 15 m, preferably 10 to 13 m is used from the viewpoint of easy coating treatment. Needless to say, even if the particle size is larger or smaller, the desired effect can be exhibited.
- the fatty acid amide is formed on the surface of expandable styrene resin particles.
- a mixer such as a Henschel mixer
- / or a fatty acid bis amide and a fatty acid metal salt can be coated.
- the fatty acid amide and Z or fatty acid bisamide and fatty acid metal salt are mixed in a mixer or both are simultaneously added to a mixer. Alternatively, it may be coated by mixing, but it is preferable to coat the fatty acid amide and / or the fatty acid bis amide and then coat the fatty acid metal salt.
- the state in which the fatty acid amide and / or the fatty acid bis amide and the fatty acid metal salt are present in some form due to coating or adhesion on the surface of the expandable styrene resin particles is referred to as coating.
- coating one or more of glycerin, polyethylene glycol, polypropylene glycol, fatty acid monoglyceride, polyoxyethylene alkyl ether, and polyoxyethylene fatty acid ester, which are generally used as an antistatic agent, may be used. It is possible. Among them, it is preferable to use polyethylene glycol.
- the method for producing the pre-expanded particles from the expandable styrene resin particles of the second invention and the method for producing the expanded molded article by molding the pre-expanded particles are the same as those in the first invention.
- the expanded molded article obtained by pre-expanding and then molding the expandable styrenic resin particles of the second invention is capable of substantially suppressing penetration of oils and fats and other highly permeable contents. Therefore, it can be suitably used as food containers such as instant ⁇ , instant ⁇ ⁇ with added carrelle ⁇ , carrelle ⁇ , curry, stew, mayonnaise, margarine, donut, hamper gar, fried chicken, coconut, etc. It is.
- instant food, curry, and curry which contain a large amount of oils and fats and have extremely strong penetrating power, such as curry, under severe conditions such as high temperatures. There is no danger that the contents will penetrate to the outside through the container wall even when stored and transported.
- the obtained expandable styrenic resin particles were put into a rotary stirring type pre-expansion device, and foamed in steam at about 95 until the bulk density became 98 g / L for about 6 minutes to obtain pre-expanded particles. .
- the side wall of the foamed foam was divided by hand, and the percentage of particles in which the expanded particles themselves were broken out of all the particles present in the fractured surface was expressed as a percentage. More than 80% pass.
- Table 1 shows the evaluation results.
- ⁇ The mold surface is dark even with a thin layer.
- Table 1 shows the mold contamination levels.
- a cup-shaped foam was obtained in exactly the same manner as in Example A2 except that the amount of zinc stearate used was changed as shown in Table 1.
- Table 1 shows the evaluation results. Further, molding was continuously performed for about one week in the same manner as in Example A2, and the degree of contamination on the mold surface was evaluated. Table 1 shows the results.
- Zinc stearate was directly decomposed from a direct product (Nippon Oil & Fats Co., Ltd .: Zinc Stearate GF-200) to a metathesis product of fatty acid sodium content shown in Table 1 (Naimoto Yushi Co., Ltd .: zinc stearate, A cup-shaped foamed article was obtained in the same manner as in Example A1, except that 66% of particles having a particle diameter of 10 zm or less were contained and the average particle diameter was 7 zm. Table 1 shows the evaluation results. Further Example A PC orchid 00 bun 614
- Molding was performed continuously for about one week in the same manner as in 1, and the degree of contamination on the mold surface was evaluated. Table 1 shows the results.
- the fatty acid sodium content in zinc stearate was measured by the following method.
- a cup-shaped foam was obtained in the same manner as in Example A1, except that the post-polymerization at 120 ° C was shortened to 1 hour. Table 1 shows the evaluation results. Further, molding was performed continuously for about one week in the same manner as in Example A1, and the degree of contamination on the mold surface was evaluated. Table 1 shows the results.
- a cup-shaped foam molded article was obtained in the same manner as in Example A1 except that the post-polymerization at 120 ° C. was reduced to 0.5 hour. Table 1 shows the evaluation results. Further, molding was continuously performed for about one week in the same manner as in Example A1, and the degree of contamination on the mold surface was evaluated. Table 1 shows the results.
- Foaming Tylene-based shelf fiber Foaming agent composition (% by weight) Zinc stearate Cup-shaped molded body evaluation
- the expandable styrenic resin particles of the first invention contain 3 to 5.5% by weight of an easily volatile blowing agent containing 15 to 60% by weight of isopentane, and have a styrene type monomer content of 10 to 50%. Expandable polystyrene resin particles having a content of sodium fatty acid of 0.1 to less than 0.1% by weight based on 100 parts by weight of the resin particles.
- a foamed molded article such as a food container is formed by using, as the zinc stearate, zinc stearate having a fatty acid sodium content of 0.1% by weight or less as an impurity.
- the zinc stearate zinc stearate having a fatty acid sodium content of 0.1% by weight or less as an impurity.
- expandable styrene resin particles having a particle diameter of 0.3 to 0.5 mm, a residual styrene monomer content of 40 ppm, a blowing agent content of 4.3% by weight, and a weight average molecular weight of 300,000 were obtained.
- the above 5 liter reactor was scaled up to a 1500 liter reactor, and the same foamable styrene resin particles were obtained by the same prescription and used for continuous molding. did.
- Zinc stearate a shown in Table 2 is a direct product (manufactured by NOF Corporation: zinc stearate GF-200, containing 60% of particles with a particle size of 10 m and an average particle size of 10 m)
- the zinc stearate b is a metathesis product (manufactured by NOF Corporation: zinc stearate, containing 0.05% by weight of fatty acid sodium, 66% of particles having a particle size of 10 / im or less, and average particles With a diameter of 7 m).
- Magnesium stearate is a direct product (manufactured by NOF CORPORATION: magnesium stearate GF-200, containing 63% of particles with a particle diameter of 10 m or less and an average particle diameter of 7 nm).
- the obtained expandable styrene resin particles were charged into a rotary stirring type prefoaming apparatus, and foamed in steam at about 95 ° C. for about 6 minutes until the bulk density became 98 gZL to obtain preliminarily foamed particles.
- Examples B 16 to B 18 A cup-shaped foam molded article was obtained in the same manner as in Example B1, except that the composition of the blowing agent was changed as shown in Table 3.
- aqueous surfactant solution containing 0.1% by weight of Score Roll 700 Concent and 0.105% by weight of Eriochrome Black T, manufactured by Kitahiro Chemical Co., Ltd., is placed in a pliable foam and the The time required for the aqueous surfactant solution to penetrate the outer wall surface and start to appear water droplets was measured. 30 minutes or more are passed.
- Zinc stearate a Directly processed product
- Zinc stearate b Double decomposition product
- Zinc stearate a Direct method
- the expandable styrene-based resin particles of the second invention contain an easily volatile blowing agent, and the expandable polystyrene-based resin particles having a styrene-based monomer content of 100 ppm or less are the resin particles 1 0.01 to 0.5 parts by weight of at least one of fatty acid amide and fatty acid bisamide and 0.2 to 0.5 part by weight of a metal salt of fatty acid
- the foamed styrenic resin particles are pre-foamed and then foamed, such as a food container, which is obtained by pre-expanding the foamed styrenic resin particles, such as improvised, curry, stew, mayonnaise, margarine, donut, By using it for containers such as hamburgers, fried chicken, coffee, etc., it is possible to extremely effectively prevent the components of these contents from penetrating into the container wall and from penetrating to the outside through the container wall. , Moreover, the strength and printing performance are excellent.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0313138-6A BR0313138A (pt) | 2002-08-09 | 2003-03-06 | partìcula de resina de estireno expansìveis, partìculas pré-expandidas e espumada moldada usando as mesmas |
US10/522,904 US20050261455A1 (en) | 2002-08-09 | 2003-03-06 | Formable styrenic resin particle, and pre-formed particle and foamed molding using the same |
KR1020057001567A KR100909309B1 (ko) | 2002-08-09 | 2003-03-06 | 발포성 스티렌계 수지 입자, 및 이것을 이용한 예비 발포입자, 발포 성형체 |
JP2004527311A JPWO2004014992A1 (ja) | 2002-08-09 | 2003-03-06 | 発泡性スチレン系樹脂粒子、およびこれを用いた予備発泡粒子、発泡成形体 |
HK06100583.7A HK1080877A1 (en) | 2002-08-09 | 2006-01-13 | Formable styrenic resin particle, and pre-formed particle and foamed moldings using the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002/233689 | 2002-08-09 | ||
JP2002233689 | 2002-08-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004014992A1 true WO2004014992A1 (ja) | 2004-02-19 |
Family
ID=31711871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/002614 WO2004014992A1 (ja) | 2002-08-09 | 2003-03-06 | 発泡性スチレン系樹脂粒子、およびこれを用いた予備発泡粒子、発泡成形体 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20050261455A1 (ja) |
JP (1) | JPWO2004014992A1 (ja) |
KR (1) | KR100909309B1 (ja) |
CN (1) | CN100425642C (ja) |
BR (1) | BR0313138A (ja) |
HK (1) | HK1080877A1 (ja) |
WO (1) | WO2004014992A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005248098A (ja) * | 2004-03-08 | 2005-09-15 | Sekisui Plastics Co Ltd | 発泡性スチレン系樹脂粒子の製造方法、発泡性スチレン系樹脂粒子、スチレン系樹脂予備発泡粒子及びスチレン系樹脂発泡成形体 |
JP2010084152A (ja) * | 2010-01-22 | 2010-04-15 | Sekisui Plastics Co Ltd | 発泡性スチレン系樹脂粒子 |
JP2021147598A (ja) * | 2020-03-24 | 2021-09-27 | 積水化成品工業株式会社 | 発泡性スチレン系樹脂小粒子、予備発泡スチレン系樹脂小粒子、およびスチレン系樹脂発泡成形体 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20100110788A (ko) * | 2007-12-28 | 2010-10-13 | 세키스이가세이힝코교가부시키가이샤 | 난연성 발포성 스티렌계 수지 입자 및 그 제조 방법 |
TWI413656B (zh) * | 2009-07-29 | 2013-11-01 | Sekisui Plastics | 發泡性苯乙烯類樹脂粒子 |
CN105542216A (zh) * | 2009-10-27 | 2016-05-04 | 积水化成品工业株式会社 | 建材用绝热材料、填土用部件和车辆内饰材料 |
US10358538B2 (en) | 2009-10-27 | 2019-07-23 | Sekisui Plastics Co., Ltd. | Foamable polystyrene resin particles and polystyrene resin prefoamed particles |
TWI765850B (zh) * | 2015-03-26 | 2022-06-01 | 日商住友化學股份有限公司 | 烤箱器皿及烤箱器皿成形用樹脂組成物 |
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JPS4915761A (ja) * | 1972-06-01 | 1974-02-12 | ||
JPS55127441A (en) * | 1979-03-23 | 1980-10-02 | Kanegafuchi Chem Ind Co Ltd | Expandable thermoplastic polymer particle composition |
JPS6026042A (ja) * | 1983-07-20 | 1985-02-08 | Sekisui Plastics Co Ltd | 発泡性熱可塑性樹脂粒子 |
JPH04220441A (ja) * | 1990-12-20 | 1992-08-11 | Hitachi Chem Co Ltd | 発泡性熱可塑性樹脂粒子及び発泡成形品 |
JPH0873397A (ja) * | 1994-09-05 | 1996-03-19 | Kao Corp | 金属石鹸の製造方法 |
Family Cites Families (1)
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US5605937A (en) * | 1994-09-30 | 1997-02-25 | Knaus; Dennis A. | Moldable thermoplastic polymer foam beads |
-
2003
- 2003-03-06 US US10/522,904 patent/US20050261455A1/en not_active Abandoned
- 2003-03-06 BR BRPI0313138-6A patent/BR0313138A/pt not_active IP Right Cessation
- 2003-03-06 CN CNB03819077XA patent/CN100425642C/zh not_active Expired - Fee Related
- 2003-03-06 WO PCT/JP2003/002614 patent/WO2004014992A1/ja active Application Filing
- 2003-03-06 KR KR1020057001567A patent/KR100909309B1/ko not_active IP Right Cessation
- 2003-03-06 JP JP2004527311A patent/JPWO2004014992A1/ja active Pending
-
2006
- 2006-01-13 HK HK06100583.7A patent/HK1080877A1/xx not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS4915761A (ja) * | 1972-06-01 | 1974-02-12 | ||
JPS55127441A (en) * | 1979-03-23 | 1980-10-02 | Kanegafuchi Chem Ind Co Ltd | Expandable thermoplastic polymer particle composition |
JPS6026042A (ja) * | 1983-07-20 | 1985-02-08 | Sekisui Plastics Co Ltd | 発泡性熱可塑性樹脂粒子 |
JPH04220441A (ja) * | 1990-12-20 | 1992-08-11 | Hitachi Chem Co Ltd | 発泡性熱可塑性樹脂粒子及び発泡成形品 |
JPH0873397A (ja) * | 1994-09-05 | 1996-03-19 | Kao Corp | 金属石鹸の製造方法 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005248098A (ja) * | 2004-03-08 | 2005-09-15 | Sekisui Plastics Co Ltd | 発泡性スチレン系樹脂粒子の製造方法、発泡性スチレン系樹脂粒子、スチレン系樹脂予備発泡粒子及びスチレン系樹脂発泡成形体 |
JP4653405B2 (ja) * | 2004-03-08 | 2011-03-16 | 積水化成品工業株式会社 | 発泡性スチレン系樹脂粒子の製造方法、発泡性スチレン系樹脂粒子、スチレン系樹脂予備発泡粒子及びスチレン系樹脂発泡成形体 |
JP2010084152A (ja) * | 2010-01-22 | 2010-04-15 | Sekisui Plastics Co Ltd | 発泡性スチレン系樹脂粒子 |
JP2021147598A (ja) * | 2020-03-24 | 2021-09-27 | 積水化成品工業株式会社 | 発泡性スチレン系樹脂小粒子、予備発泡スチレン系樹脂小粒子、およびスチレン系樹脂発泡成形体 |
JP7445480B2 (ja) | 2020-03-24 | 2024-03-07 | 積水化成品工業株式会社 | 発泡性スチレン系樹脂小粒子、予備発泡スチレン系樹脂小粒子、およびスチレン系樹脂発泡成形体 |
Also Published As
Publication number | Publication date |
---|---|
HK1080877A1 (en) | 2006-05-04 |
BR0313138A (pt) | 2007-07-17 |
CN1675294A (zh) | 2005-09-28 |
KR20050034723A (ko) | 2005-04-14 |
CN100425642C (zh) | 2008-10-15 |
JPWO2004014992A1 (ja) | 2005-12-08 |
KR100909309B1 (ko) | 2009-07-24 |
US20050261455A1 (en) | 2005-11-24 |
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