JPH1036524A - Packaging material and its use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a packaging material capable of trapping aldehydes generated from a resin in the package and reducing the irritant smell in the opening of the package. SOLUTION: This packaging material for packaging a resin generating aldehydes is composed of a resin composition containing (A) a thermoplastic resin and (B) a compound having hydrazino group and/or hydrazono group. The aldehyde-generating resin is e.g. polyoxymethylene resin, phenolic resin and aminoaldehyde resin. The resin A is e.g. an olefin resin, a styrene resin, an ester resin, an amide resin and a urethane resin and the compound B is e.g. an alkylhydrazine, an aryl-hydrazine, a hydrazide and a hydrazone. The amount of the compound B is 0.005-2.5 pts.wt. in terms of the weight of one hydrazino group or hydrazono group based on 100 pts.wt. of the resin A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a packaging material and a method for using the same.

[0002]

2. Description of the Related Art Polyoxymethylene resins include formaldehyde or its cyclic oligomer trioxane,
Or a resin obtained by polymerizing trioxane with cyclic ether, cyclic formal, etc., and has excellent mechanical properties (eg, tensile strength, creep resistance, etc.), abrasion resistance, fatigue resistance, solvent resistance, etc. Widely used as engineering plastics. However, the polyoxymethylene resin may be degraded, depolymerized, or decomposed by heat, light, oxygen, or the like, and form an irritating odor. This gas not only has an adverse effect on workers, but also has the problem of deteriorating the characteristics of the molded article. Therefore, suppression of formaldehyde gas is desired.

Many attempts have been made to suppress the formation of formaldehyde due to the thermal decomposition (depolymerization) of polyoxymethylene resins, for example, stabilization treatment by esterification of terminal groups of the resin, antioxidants and other thermal agents. Stabilizers are added. JP-A-4-345648 proposes a method of blending a hydrazide compound with a polyoxymethylene resin to suppress aldehydes generated from the resin. However, minute decomposition in the kneading process in the kneading machine and the molding process in various molding machines is unavoidable, and the polyoxymethylene resin pellets or the molded product thereof may have a small amount of formaldehyde gas before the temperature decreases and solidifies. Is generated. Therefore, if a large number of the resin pellets or molded articles thereof are packed in a container in a state where the temperature is not sufficiently cooled and the temperature is still high, the container is filled with formaldehyde and gives an irritating odor to an operator at the time of opening. For this reason, measures such as forming a ventilation hole in the container have been taken, but such measures are complicated, increase the cost, and lower the strength of the container. In addition, if a vent is formed in the container,
Since the waterproofness of the container is impaired, the method of storing and transporting the resin that generates formaldehyde is restricted. This may occur, for example, when polyoxymethylene resin pellets or molded articles thereof are loaded into a high temperature hull and transported by ship or the like, or stored at high temperatures.

[0004]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a packaging material capable of effectively removing aldehyde generated from a resin and a method of using the same. Another object of the present invention is to provide a packaging material capable of reducing the aldehyde concentration in a sealed bag or container and suppressing a pungent odor at the time of opening, and a method of using the same.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, have found that a compound having an aldehyde trapping ability is contained as a packing material for packing a resin that produces aldehyde. The present inventors have found that the use of such a resin composition can reduce the aldehyde odor in the package, and completed the present invention.

That is, the packing material of the present invention is a packing material formed of a thermoplastic resin composition containing (A) a thermoplastic resin and (B) a compound having a hydrazino group or a hydrazono group. For resins that produce aldehydes, for example,
Polyoxymethylene resins, polyvinyl acetal, phenol resins, amino aldehyde resins and the like are included. The thermoplastic resin (A) includes, for example, an olefin resin, a halogen-containing vinyl resin, a styrene resin, an ester resin, an amide resin, and a urethane resin. The compound (B) having a hydrazino group or a hydrazono group includes, for example, alkylhydrazines, arylhydrazines, hydrazides, hydrazones, and the like. The present invention also relates to a method of using the packaging material in which a resin that generates aldehyde is contained in the packaging material.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the components of the packing material of the present invention will be described in detail.

[Aldehyde-forming resin] Examples of the aldehyde-forming resin include resins that generate aldehyde by the action of heat, light, oxygen, acid, alkali, water, etc.
Resins derived from aliphatic aldehydes such as formaldehyde (formalin) and acetaldehyde and aromatic aldehydes such as benzaldehyde are included. As such a resin, for example, a thermoplastic resin [for example, a polyoxymethylene-based resin such as a polyoxymethylene homopolymer or a copolymer, polyvinyl acetal (for example, polyvinyl formal, polyvinyl butyral, etc.)], a thermosetting resin [for example, , Phenolic resin (for example, novolak type, resol type phenolic resin, etc.),
Aminoaldehyde-based resin (eg, urea resin, benzoguanamine resin, melamine resin, etc.)]. Among these resins, thermoplastic resins, particularly polyoxymethylene resins, need to be packaged at a high temperature in order to increase the productivity by subjecting them to pelletization or molding by heating and melting, and the like. However, as described above, when packing is performed in a state where the temperature of the resin pellet or the molded article is high, generation of aldehyde becomes a problem. Therefore, the packing material of the present invention is suitably applied to a thermoplastic resin, particularly a polyoxymethylene resin. The resin for producing the aldehyde,
They may be used alone or in combination of two or more.Addition of antioxidants, ultraviolet absorbers, stabilizers such as heat stabilizers, antistatic agents, coloring agents, lubricants, flame retardants, fillers, etc. It may contain an agent.

The polyoxymethylene resin is a polymer compound containing an oxymethylene group (—CH ₂ O—) as a constituent unit. Examples thereof include aldehydes such as formaldehyde, paraformaldehyde and acetaldehyde, trioxane, ethylene oxide and propylene oxide. ,
It is formed by polymerization of a cyclic ether such as 1,3-dioxolan. The polyoxymethylene-based resin includes a polyoxymethylene homopolymer and a polyoxymethylene copolymer. In addition to the oxymethylene group, the polyoxymethylene copolymer has an oxyalkylene unit having about 2 to 6 carbon atoms, preferably about 2 to 4 carbon atoms (for example, an oxyethylene group (—CH ₂ CH ₂ O—), Propylene group, oxytetramethylene group, etc.) as a structural unit in many cases. The terminal of the polyoxymethylene resin may be stabilized by, for example, esterification with a carboxylic acid such as acetic acid, propionic acid, or butyric acid.

[(A) Thermoplastic Resin] A packing material for packing the resin for producing the aldehyde is composed of a thermoplastic resin (A) and a compound (B) having a hydrazino group or a hydrazono group. I have. The thermoplastic resin (A)
Resins having moldability, particularly film forming ability, are preferred.
Such resins include, for example, olefin resins, halogen-containing vinyl resins, styrene resins, ester resins, amide resins, urethane resins, acrylic resins,
Polyether, polycarbonate, polyvinyl alcohol, polyvinyl acetate, polyamide imide, polyimide,
Cellulose such as polysulfone, polyethersulfone, polyetheretherketone, polyetherketone, polyphenylenesulfide, cellophane, etc., elastomers, natural rubber, rubber hydrochloride, and copolymers containing the constituent components of these polymers as constituent units, etc. . The thermoplastic resin (A) may have not only a straight chain but also a branched chain structure and a crosslinked structure as long as it has a film forming ability,
Further, the degree of polymerization, the degree of branching, the degree of crosslinking, the form of copolymerization (for example,
Random, block, graft, etc.) and copolymer composition ratio are not particularly limited.

More specifically, the thermoplastic resin (A)
Among them, olefin resins include, for example, homo- or copolymers of α-olefins such as ethylene, propylene, butene, 3-methylbutene-1, and 4-methylpentene-1 [for example, polyethylene (low density, medium density, High-density, linear low-density polyethylene), polypropylene, polybutene, poly (3-methylbutene-1), poly (4-methylpentene-1), ethylene-propylene copolymer, etc.]; Copolymerizable monomer (for example, vinyl chloride, vinyl acetate, acrylic monomer, etc.)
And derivatives thereof (e.g., olefin-halogen-containing vinyl copolymers such as ethylene-vinyl chloride copolymer, propylene-vinyl chloride copolymer, chlorinated propylene-vinyl chloride copolymer), ethylene-acetic acid Vinyl copolymers, ethylene-vinyl alcohol copolymers, ethylene-ethyl acrylate copolymers); halogen-containing olefin resins (eg, chlorinated polyethylene, chlorinated polypropylene, brominated polyethylene, etc.).

The halogen-containing vinyl resin includes, for example,
Homo- or copolymers of halogen-containing vinyl monomers such as vinyl chloride, vinyl bromide, vinyl fluoride, and vinylidene chloride (for example, polyvinyl chloride, polyvinyl bromide, polyvinyl fluoride, polyvinylidene chloride, vinyl chloride- Vinylidene chloride copolymer); a halogen-containing vinyl monomer and another copolymerizable monomer (for example, vinyl acetate, butadiene,
Copolymers with isoprene, styrene monomers, acrylic monomers, maleic anhydride, etc. [for example, vinyl chloride-vinylidene chloride-vinyl acetate copolymer, vinyl chloride-
Halogen-containing vinyl-styrene copolymers such as vinyl acetate copolymer, vinyl chloride-butadiene copolymer, vinyl chloride-isoprene copolymer, vinyl chloride-styrene copolymer, and vinyl chloride-styrene- (meth) acrylonitrile copolymer Halogen-containing vinyl-styrene-acrylic copolymers such as polymers, vinyl chloride-styrene-maleic anhydride copolymers, vinyl chloride-acrylonitrile copolymers, vinyl chloride- (meth) acrylate copolymers, etc. Halogen-containing vinyl-acrylic copolymers; vinyl chloride-maleic acid ester copolymers and the like].

The styrene resin includes, for example, an aromatic vinyl monomer (styrene, α-methylstyrene, vinyltoluene, etc.) homopolymer or copolymer (eg, polystyrene, etc.); [Acrylonitrile-styrene copolymer (AS resin)] with a copolymerizable monomer [(meth) acrylonitrile, acrylic monomer such as (meth) acrylate, maleic anhydride, etc.] , An acrylic monomer such as a (meth) acrylate-styrene copolymer-styrene copolymer, etc.]; a rubber-modified styrene copolymer [eg, styrene and an elastomer (eg, butadiene rubber, acrylic rubber) or Copolymer with maleic acid (for example, butadiene-styrene copolymer (BS resin), acrylonitrile-butadiene-styrene) Emissions copolymer (ABS resin),
(Meth) acrylic acid ester-butadiene-styrene copolymer or other acrylic monomer-butadiene-styrene copolymer).

The ester resins include, for example, poly C _2-6
Alkylene terephthalates (e.g., polyethylene terephthalate, polybutylene terephthalate, etc.), poly C _2-6 alkylene naphthalate (e.g., polyethylene naphthalate, polybutylene naphthalate, etc.), C
Examples include polyester copolymers, polyarylates, polyester elastomers and the like having _2-6 alkylene terephthalate or C _2-6 alkylene naphthalate as a main repeating unit. Examples of the amide-based resin include polyamides such as polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 46, polyamide 610, polyamide 612, and polyamide elastomers. The urethane-based resin includes, for example, polyurethane and polyurethane elastomer. The acrylic resin includes, for example, poly (meth) acrylonitrile, poly (meth) acrylate (for example, poly (meth) acrylate C _1-10 alkyl ester such as methyl methacrylate and polyethyl acrylate) and the like. Examples of the polyether include poly C _2-6 alkylene oxide (eg, polyethylene oxide and the like),
And polyphenylene ether.

Preferred thermoplastic resins (A) include olefin resins such as polyethylene and polypropylene, halogen-containing vinyl resins such as polyvinyl chloride, and styrene such as polystyrene and acrylonitrile-butadiene-styrene copolymer (ABS resin). Resins, ester resins such as polyethylene terephthalate and polybutylene terephthalate, amide resins such as polyamide 6, polyamide 66, polyamide 11, and polyamide 12, and urethane resins such as polyurethane.

These thermoplastic resins (A) can be used alone or in combination of two or more. In addition, thermoplastic resins include stabilizers such as antioxidants, ultraviolet absorbers, and heat stabilizers, plasticizers, release agents, antistatic agents, coloring agents, lubricants, flame retardants, fillers, and foaming agents. It may contain an agent.

[(B) Compound having a hydrazino group or a hydrazono group] Aldehyde is produced using a packing material formed of a thermoplastic resin composition containing a compound (B) having a hydrazino group or a hydrazono group. When the resin is packed in a sealed environment, the compound (B) (hereinafter, sometimes simply referred to as a trapping agent) traps the aldehyde, even if the resin generates aldehyde in the package in a sealed environment. Aldehyde of aldehyde can be significantly reduced. The compound (B) having a hydrazino group or a hydrazono group includes, for example,
Hydrazine or a derivative thereof [eg, alkyl hydrazines (eg, C _1-10 alkyl hydrazine such as methyl hydrazine, dimethyl hydrazine, ethyl hydrazine), and aryl hydrazines (eg, C _6-14 such as hydrazino benzene, hydrazino toluene and the like) Arylhydrazine), hydrazinocarboxylic acids (eg, carbazic acid, hydrazinoacetic acid, α-hydrazinopropionic acid, α
Hydrazinoisobutyric acid, hydrazinobenzoic acid, etc.), hydrazides, hydrazones, etc.]. Alkyl hydrazine is produced, for example, by a reaction between hydrazine and alkyl iodide. Arylhydrazine is obtained, for example, by reducing a diazonium salt of an aromatic hydrocarbon with tin chloride and hydrochloric acid. The hydrazinocarboxylic acids are obtained, for example, by reducing isonitroaminocarboxylic acid with sodium amalgam.

The hydrazides include, for example, monocarboxylic monohydrazides, polycarboxylic mono or polyhydrazides, and the like. The monocarboxylic hydrazides, for example, acetic acid hydrazide, propionic acid hydrazide, butyric hydrazide, palmitic acid hydrazide, C _2-18 aliphatic monocarboxylic hydrazide such as stearic acid hydrazide, such as benzoic acid hydrazide C _{7- 15} aromatic monocarboxylic acid monohydrazide and the like. Polycarboxylic mono- or polyhydrazides, for example,
Oxalic acid mono or dihydrazide, malonic acid mono or dihydrazide, succinic acid mono or dihydrazide, glutaric acid mono or dihydrazide, adipic acid mono or dihydrazide, pentamethylene dicarboxylic acid mono or dihydrazide, suberic acid mono or dihydrazide, sebacic acid mono or dihydrazide, Dodecane diacid mono- or dihydrazide, tetradecandioic acid mono- or dihydrazide,
C _2-40 saturated aliphatic polycarboxylic acid mono or polyhydrazide such as oxadivaleric acid mono or dihydrazide, dimer acid mono or dihydrazide (preferably C _2-18 aliphatic polycarboxylic acid mono or polyhydrazide); maleic acid mono or Dihydrazide, fumaric acid mono- or dihydrazide,
Unsaturated aliphatic polycarboxylic acid mono- or polyhydrazide such as itaconic acid mono- or dihydrazide; phthalic acid mono- or dihydrazide, isophthalic acid mono- or dihydrazide,
_C8-15 aromatic polycarboxylic acid mono or polyhydrazide such as terephthalic acid mono or dihydrazide, chlorohexyl dicarboxylic acid mono or dihydrazide, naphthalene dicarboxylic acid mono or dihydrazide, poly (meth) acrylic acid hydrazide, (meth) acrylic acid hydrazide Copolymers having units [for example, (meth) acrylamide- (meth) acrylic acid hydrazide copolymer and the like] are included. The hydrazides include, for example, a reaction of a mono- or polycarboxylic acid or a derivative thereof (eg, a C _1-4 alkyl ester, an acid halide, an acid anhydride, etc.) with hydrazine, poly (meth) acrylic acid or a derivative thereof (eg,
(Eg, polyacrylate) and hydrazine. The hydrazides also include carbodihydrazide formed by the reaction between carbonic acid and hydrazine.

The hydrazones include, for example, aldehyde hydrazones such as phenylhydrazone and 2,4-dinitrohydrazone; ketone hydrazones such as acetone hydrazone and benzophenone hydrazone. Hydrazones are produced, for example, by the reaction of a carbonium compound (eg, aldehydes, ketones) with hydrazine.

The compound (B) having a hydrazino group or a hydrazono group may be a salt (eg, hydrazine disulfonic acid potassium salt) or a hydrate (eg, hydrazine monohydrate). It may be.
Preferred compounds (B) include hydrazides such as C
_2-18 aliphatic monocarboxylic acid monohydrazide, C _7-15 aromatic monocarboxylic acid monohydrazide, C _2-18 saturated aliphatic polycarboxylic acid polyhydrazide, C _8-15 aromatic polycarboxylic acid polyhydrazide, etc. It is, in particular, C _2-18 saturated aliphatic dicarboxylic acid dihydrazide compound, C _{8- 15} aromatic dicarboxylic acid dihydrazide are preferred. The capture agent (B) may be used alone or in combination of two or more.

Even if the content of the scavenger (B) is small, the amount of aldehyde generated in the packaging can be reduced.
The content of the scavenger is, for example, converted into the weight per hydrazino group or hydrazono group, and the content of the thermoplastic resin (A)
The amount can be selected from the range of about 0.005 to 2.5 parts by weight, preferably about 0.025 to 1.5 parts by weight, more preferably about 0.04 to 1.25 parts by weight, based on 100 parts by weight.
For example, in the case of a compound having two hydrazino groups or hydrazono groups in the molecule, the thermoplastic resin (A) 100
0.01 to 5 parts by weight, preferably 0.1 to 5 parts by weight, based on parts by weight.
About 0.5 to 3 parts by weight, more preferably 0.08 to 2.
It can be selected from a range of about 5 parts by weight. If the content of the scavenger (B) is small, it is difficult to reduce the amount of aldehyde generated in the package, and if it is too large, exudation (bleeding) or surface peeling of the scavenger may occur. .

The thermoplastic resin (A) and the scavenger (B)
Can be easily prepared by conventional equipment and methods generally used as a conventional resin composition preparation method. As such a preparation method, for example, after mixing the components of the resin composition, kneading and extruding with an extruder to prepare and mold pellets, once prepare pellets having a different composition, and mix a predetermined amount of the pellets Examples include a method of molding and obtaining a molded article having a desired composition after molding, and a method of directly charging one or more of each component to a molding machine. Mixing and adding a part of the resin component as a fine powder with other components is a preferable method for uniformly blending these components.

A feature of the present invention is that the scavenger (B) is contained in the packing material. Therefore, there is no possibility that there will be restrictions on the formulation of the resin that produces the aldehyde, and there is no possibility that the physical properties will decrease.

The packaging material of the present invention may be a container or a container, but is often a film or sheet useful for obtaining a packaging bag having high operability, and particularly a film. There are many. Such a film has not only a single-layer structure but also a plurality of polymer layers, at least one polymer layer and a substrate layer (for example, a cellulosic film such as cellophane, a metal foil such as an aluminum foil, and a porous substrate such as paper). Material).
In the case of a film having a laminated structure, the concentration of the scavenger (B) in the inner layer may be, for example, about 1 to 5 times the above range. The film thickness and the like are not particularly limited, and can be appropriately selected depending on mechanical strength, flexibility, and the like. The thickness of the film can be selected, for example, from the range of about 0.001 to 0.2 mm, preferably about 0.01 to 0.1 mm. In molding the resin composition containing the thermoplastic resin (A) and the trapping agent (B), a conventional molding method, such as extrusion molding, blow molding, or injection, is used depending on the type of the resin and the desired form. Methods such as molding, vacuum molding, compression molding, and foam molding can be used. When forming a film,
Depending on the layer structure of the film, for example, a conventional molding method such as extrusion molding using a T-die, multilayer extrusion molding, or inflation molding can be used. In the laminated film,
It may be manufactured by laminating a polymer layer or a base material layer and a polymer layer by dry lamination or the like.

Since the packing material of the present invention has an aldehyde trapping ability, even if the resin for producing aldehyde is stored in the packing material at a high temperature immediately after pelletization or molding, the concentration of aldehyde in the packing can be improved. Can be reduced. Therefore, the packing material of the present invention is useful for containing a resin that generates aldehyde. The packing material may be, for example, a bag for accommodating polyoxymethylene-based resin pellets (resin alone bag, paper laminated bag, etc.) or a container, a spray nozzle, a cosmetic part such as a lipstick mechanism part, or a polyoxymethylene such as a bottle. It can be used as a bag or container for accommodating a base resin molded article, an automobile seat covering material and its cover film, or a bag or container for accommodating electric products.

[0026]

As the packaging material of the present invention uses a thermoplastic resin composition containing a specific compound, the amount of aldehydes generated by thermal decomposition of the resin, etc., in a closed package is significantly reduced. it can. Moreover, even if the content of the specific compound is small, the packaging material can suppress the aldehyde odor for a long period of time. Furthermore, when the packing material of the present invention is used, even when the temperature of the resin pellets or the molded product thereof that generates aldehyde is high, the aldehyde odor at the time of opening can be remarkably suppressed only by containing the resin pellet in the packing material.

[0027]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. The test pieces shown in Examples and Comparative Examples were prepared and evaluated by the following preparation methods and evaluation methods.

(1) Preparation of pellets of thermoplastic resin and hydrazide Using a twin-screw extruder TEX-30 (manufactured by Nippon Steel Works, Ltd.), the following hydrazide is compounded into a commercially available thermoplastic resin at a predetermined ratio. The mixture was kneaded to obtain a thermoplastic resin composition pellet. Extrusion conditions are such that the cylinder temperature is set to be 10 to 30 ° C. higher than the melting point or softening point of the resin, the screw rotation speed is 100 rpm, and the discharge rate is 5 kg / H, depending on the type of the resin.
r.

[Thermoplastic resin] a-1: Polyethylene resin (Mirason 401, manufactured by Mitsui Petrochemical Co., Ltd.) a-2: Polypropylene resin (Hypol J200, manufactured by Mitsui Petrochemical Co., Ltd.) a-3: Polyamide resin (polyamide 66) a-4: Polyurethane resin (Milactran P480MSUD, manufactured by Nippon Milactran) a-5: Polybutylene terephthalate resin (Duranex 600FP, manufactured by Polyplastics) a-6: Acrylonitrile-butadiene-styrene copolymer (ABS resin) (Sebian DP61 manufactured by Daicel Chemical Industries, Ltd.
1) [Hydrazides] (manufactured by Otsuka Chemical Co., Ltd.) b-1: adipic acid dihydrazide b-2: sebacic acid dihydrazide b-3: isophthalic acid dihydrazide b-4: acrylamide-acrylhydrazide copolymer (2) film forming plastmill Extruder (D = 20mm, Toyo Seiki Co., Ltd.)
T-die (width: 150 mm) was set in the mold, and the above-mentioned thermoplastic resin composition was formed into a film. The molding conditions are set such that the cylinder temperature is set to 10 to 30 ° C. higher than the melting point or softening point of the resin, and the screw rotation speed is set to 50 r, depending on the type of the resin.
pm, a discharge rate of 2 kg / Hr, and a chill roll temperature of 60 ° C.

(3) Evaluation method of residual formaldehyde amount In a container having a capacity of 100 ml, 20 polyoxymethylene rod-shaped molded articles (2 × 2 × 50 mm) and a thermoplastic resin film containing hydrazide (100 × 50) were used. × 0.1
mm), and the container was hermetically sealed and allowed to stand at 60 ° C. for 24 hours. After opening the container, the odor of the atmosphere in the container was smelled, and the degree of formaldehyde odor was evaluated according to the following five ranks.

A: No formaldehyde odor at all B: Very slight formaldehyde odor irritation C: Slight formaldehyde odor irritation D: Slight formaldehyde odor irritation E: Significant formaldehyde odor irritation ( 4) After the thermoplastic resin composition was formed into a film, the degree of hydrazide exudation from the film surface was visually observed, and the degree of exudation was rated according to the following five ranks.

A: not exuded at all B: exuded very slightly C: slightly exuded D: slightly exuded E: considerably exuded Examples 1 to 8 Various types of thermoplastic resin films containing hydrazide at the ratios shown in Table 2 are coexistent, sealed, left to stand, and after opening, the degree of formaldehyde odor in the atmosphere in the container and the surface of the thermoplastic resin film The degree of hydrazide exudation from the liposome was evaluated. Tables 1 and 2 show the results.

Comparative Examples 1 to 3 In the case where only a molded product of polyoxymethylene was put in a container,
Alternatively, the degree of formaldehyde odor and the degree of hydrazide exudation were evaluated when a molded article of polyoxymethylene and a thermoplastic resin film not containing hydrazide coexisted in a container, and the results shown in Table 2 were obtained. .

[0034]

[Table 1]

[0035]

[Table 2] As shown in Tables 1 and 2, the odor of formaldehyde and the degree of hydrazide exudation are smaller in the examples than in the comparative examples.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C08L 27/02 KHH C08L 27/02 KHH 29/14 LHA 29/14 LHA 101/00 101/00

Claims (8)

[Claims] 1. A packaging material for packaging a resin that produces an aldehyde, comprising a thermoplastic resin composition containing (A) a thermoplastic resin and (B) a compound having a hydrazino group or a hydrazono group. Packaging materials. 2. The packaging material according to claim 1, wherein the aldehyde-generating resin is at least one selected from polyoxymethylene-based resins, polyvinyl acetal, phenolic resins, and aminoaldehyde-based resins. 3. The packaging material according to claim 1, wherein the resin generating the aldehyde is a thermoplastic resin. 4. The packaging material according to claim 1, wherein the thermoplastic resin (A) is a resin having a film forming ability. 5. The thermoplastic resin (A) is at least one selected from olefin resins, halogen-containing vinyl resins, styrene resins, ester resins, amide resins, and urethane resins. 4. The packing material described in 4. 6. The packaging material according to claim 1, wherein the compound (B) is at least one selected from alkylhydrazines, arylhydrazines, hydrazides, and hydrazones. 7. The content of the compound (B) is calculated as the weight per one hydrazino group or one hydrazono group, and is 0.005 to 2.10 parts by weight based on 100 parts by weight of the thermoplastic resin (A).
The packing material according to claim 1, which is 5 parts by weight. 8. The method for using a packaging material according to claim 1, wherein the resin pellets or aldehyde-forming resin pellets or the molded product thereof are housed in the packaging material.