JP2007069726A - Door trim for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door trim for an automobile having sufficient lightweight properties and rigidity, superior in thermal insulation properties and surface appearance. <P>SOLUTION: The door trim is installed in a side wall door inside in the automobile, and includes a foamed layer, and a non-foamed layer formed on a surface of the foamed layer. Preferably, the door trim for the automobile is made up of a thermoplastic resin injection foamed molded object with an expansion ratio in the range of 2 to 10 times, the foamed layer having an average cell size of 500 μm or less, and the non-foamed layer having a thickness in the range of 10 to 1,000 μm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a door trim that is mounted inside a side wall door of an automobile.

  The door trim is one of the automobile parts that are mounted on the side wall door in the automobile for the purpose of attaching an armrest, a handle, a button switch, etc. for decorativeness and occupant protection and opening / closing operation of the door and window glass. In recent years, weight reduction of automobile parts has been required from the viewpoint of energy saving and resource saving. In particular, it is a large product among automobile parts, and since it is used in plural, it becomes heavy and requires further weight reduction. On the other hand, sufficient practical rigidity is required so as not to be deformed at the time of its own shape retention or attachment to a door panel or the like. Furthermore, recently, in order to obtain comfort in the passenger compartment, heat insulation may be required. From the standpoint of decorativeness, it is also necessary to have an excellent appearance.

  However, resin moldings such as thermoplastic resin injection moldings or stamping moldings (for example, Patent Literature 1 and Patent Literature 2), which occupy the majority of conventional door trim materials, have an appropriate thickness to increase rigidity. Then, since the product is large, it becomes heavy, and lightness and heat insulation are insufficient.

  On the other hand, door trims composed of a highly foamed molded product (Patent Document 3), a resin bead foam molded product (for example, Patent Document 4), and the like have been proposed. Since these are composed of a foam molded article, they are lighter and have better heat insulation than the non-foamed resin molded article. However, in order to ensure the practically required rigidity, it is necessary to significantly increase the wall thickness compared to the resin molded body (usually about 3 mm), for example, about 30 mm for a 20-fold foamed product. When it becomes such thickness, there existed a problem that it became impossible to arrange | position the hard urethane foam pad required for a side collision countermeasure as said passenger | crew protection. By the way, although making the whole door trim from hard urethane foam is also proposed (for example, patent document 5), there existed a problem that the raw material of a hard urethane foam was expensive, difficult to foam uniformly, and the defect rate was high. In addition, as a method for ensuring rigidity without significantly increasing the thickness of the foamed molded product, a method of reinforcing with a glass mat or the like has been proposed, but such a molded product is inferior in weight and recyclable. There's a problem.

  As a door trim that is relatively excellent in lightness and heat insulation, a door trim in which a resin aggregate is laminated and integrated on the back side of a foamed resin sheet has been proposed (for example, Patent Document 6). However, according to this method, it is necessary to prepare a foamed resin sheet in a separate process in advance, and the mold to be used has a vacuum suction mechanism or the like in order to shape the foamed resin sheet into a predetermined shape. Is needed. In addition, in order to improve the appearance, it is necessary to laminate the skin, and the obtained molded body becomes expensive.

  On the other hand, a door trim made of an injection foam molded body of polypropylene resin is known (for example, Patent Document 7). According to this method, a door trim that is light in weight and good in appearance can be obtained, but the foaming ratio is less than twice, so that sufficient lightness and heat insulation cannot be obtained.

As described above, it has been difficult to obtain an automobile door trim that satisfies all of lightness, rigidity, heat insulation, and surface appearance.
JP-A-10-138281 JP-A-6-270680 JP-A-4-169346 JP-A-5-229024 JP-A-6-191278 JP 2004-122886 A Japanese Patent Application Laid-Open No. 11-179752

  An object of the present invention is to provide an automotive door trim that is not only excellent in light weight and rigidity but also excellent in heat insulation and surface appearance.

  The present inventors have found that by applying injection foam molding with a high expansion ratio, it is possible to obtain an automotive door trim having sufficient lightness and rigidity, and excellent heat insulation and surface appearance. It was completed.

  That is, the present invention relates to a door trim that is mounted inside a side wall door of an automobile, and the door trim has a foamed layer and a non-foamed layer formed on the surface of the foamed layer. The present invention relates to an automobile door trim characterized by comprising a molded body.

As a preferred embodiment,
(1) The foaming ratio of the injection-foamed molded article is 2 to 10 times, the average cell diameter of the foamed layer is 500 μm or less, and the non-foamed layer is 10 to 1000 μm in thickness.
(2) The injection foam molded article injection-fills a melt of a thermoplastic resin composition containing a foaming agent into a mold composed of a fixed mold and a movable mold capable of moving forward and backward, Next, the movable mold is moved backward to produce the thermoplastic resin by foaming,
(3) The thermoplastic resin is made of a polypropylene resin having a melt flow rate of 10 g / 10 min or more and 50 g / 10 min or less, a melt tension of 2 cN or more, and exhibiting strain hardening.
The above-described automobile door trim is characterized by the following.

  The automobile door trim according to the present invention is an injection-foamed molded article having a high expansion ratio made of a thermoplastic resin having a foam layer and a non-foam layer formed on the surface of the foam layer. It has rigidity, heat insulation and surface appearance.

  The automobile door trim of the present invention is mounted on the inside of a side wall door of an automobile, and has a foamed layer and a non-foamed layer formed on the surface of the foamed layer. It consists of a body. A known injection foam molding method can be applied to the method for manufacturing the automobile door trim of the present invention. For example, a melt of a thermoplastic resin composition containing a foaming agent is injected and filled into a mold composed of a fixed mold and a movable mold capable of moving forward and backward, and then the movable mold is moved backward to Manufactured by foaming a thermoplastic resin.

  In addition, when a melt of a thermoplastic resin composition containing a foaming agent is injection-filled into a mold, a known method can be applied for the purpose of preventing deterioration of the surface appearance due to the occurrence of silver streak or swirl mark. For example, the mold cavity clearance is injection-filled in a state smaller than the thickness of the molded body before foaming, or the inside of the mold is preliminarily filled with a pressurized fluid such as an inert gas of 0.1 to 10 MPa (for example, air, Nitrogen, carbon dioxide, etc.) may be used. Among these, the latter method is preferable in that a molded body having a more excellent surface appearance can be obtained.

  Other molding conditions may be appropriately adjusted depending on the melt flow rate (MFR) of the thermoplastic resin used, the type of foaming agent, the type of molding machine, or the shape of the mold. For example, when a polypropylene resin is used, the resin temperature is usually 170 to 250 ° C., the mold temperature is 10 to 100 ° C., the molding cycle is 1 to 60 minutes, the injection speed is 10 to 300 mm / second, the injection pressure is 10 to 100 MPa, etc. Done on condition.

  The foaming agent that can be used in the present invention is not particularly limited as long as it can be usually used for injection foam molding, such as a chemical foaming agent and a physical foaming agent. The chemical foaming agent is mixed with the thermoplastic resin in advance and then supplied to the injection molding machine, and decomposes in the cylinder to generate a gas such as carbon dioxide. Examples of the chemical foaming agent include inorganic chemical foaming agents such as sodium bicarbonate and ammonium carbonate, and organic chemical foaming agents such as azodicarbonamide and N, N′-dinitrosopentatetramine. A physical foaming agent is injected into a molten resin in a cylinder of a molding machine as a gaseous or supercritical fluid, dispersed or dissolved, and functions as a foaming agent by being released from pressure after being injected into a mold. It is a thing. Physical foaming agents include aliphatic hydrocarbons such as propane and butane, alicyclic hydrocarbons such as cyclobutane and cyclopentane, halogenated hydrocarbons such as chlorodifluoromethane and dichloromethane, nitrogen, carbon dioxide, air, etc. Inorganic gas. You may use these individually or in mixture of 2 or more types.

  Among these foaming agents, normal injection molding machines can be used safely, and uniform fine bubbles are easily obtained. Chemical foaming agents are inorganic chemical foaming agents, physical foaming agents are nitrogen and carbon dioxide. Inorganic gas such as air is preferable. These foaming agents include, for example, foaming aids such as organic acids such as citric acid and inorganic fine particles such as talc and lithium carbonate, in order to stably and uniformly make the foamed foam air bubbles. A nucleating agent such as may be added. Usually, the inorganic chemical foaming agent is used as a masterbatch using the same kind of resin as the thermoplastic resin having a concentration of 10 to 50% by weight from the viewpoints of handleability, storage stability, and dispersibility in the thermoplastic resin. It is preferably used.

  What is necessary is just to set the usage-amount of the said foaming agent suitably by the kind of the said thermoplastic resin, the foaming ratio of a final product, the kind of foaming agent, and the resin temperature at the time of shaping | molding. For example, usually, in the case of an inorganic chemical foaming agent, it is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the thermoplastic resin. Used in range. By using in this range, it is easy to economically obtain a foamed molded article having a foaming ratio of 2 times or more and uniform fine cells.

  Further, if necessary, the thermoplastic resin composition includes an antioxidant, a metal deactivator, a phosphorus processing stabilizer, an ultraviolet absorber, an ultraviolet stabilizer, a fluorescent brightener, a metal soap, and an antacid adsorbent. Such additives as stabilizers, crosslinking agents, chain transfer agents, nucleating agents, lubricants, plasticizers, fillers, reinforcing materials, pigments, dyes, flame retardants and antistatic agents may be used in combination. Of course, these additives used as needed are used within a range that does not impair the moldability, foaming properties, etc., but generally 0 parts by weight with respect to 100 parts by weight of the thermoplastic resin composition. It is used in the range of 0.01 parts by weight or more and 10 parts by weight or less.

  As the thermoplastic resin, known resins can be used, for example, polypropylene resin, polyethylene resin, polystyrene resin, polyvinyl chloride resin, polyamide resin, polycarbonate resin, saturated polyester resin, polymethacrylic acid. Examples thereof include ester resins. A plurality of these can be combined. Among these, a polypropylene resin excellent in the balance between lightness, recyclability, moldability and physical properties is preferable.

  The polypropylene resin used in the present invention has a melt flow rate of preferably 10 g / 10 min to 50 g / 10 min, more preferably 15 g / 10 min to 40 g / 10, in order to achieve both moldability and foamability. It is preferable that the melt tension be 2 cN or more, more preferably 5 cN or more, and exhibit strain hardening.

Here, the melt flow rate is based on ASTM D-1238 and measured under a load of 230 ° C. and 2.16 kg. use Ltd.), Ø1 mm at 230 ° C., from a die having a hole length 10 mm, pick the strand that has been lowered by the piston lowering speed 10 mm / min at 1 m / min, a take-off speed at 40 m / min ² after stabilization When increased, it refers to the take-up load of the pulley with load cell when it breaks.

  Strain hardening here is defined as that the viscosity increases as the stretch strain of the melt increases, and is usually the method described in Japanese Patent Application Laid-Open No. 62-121704, that is, the elongation measured by a commercially available rheometer. This can be determined by plotting the relationship between viscosity and time. Further, for example, strain hardening can be determined from the breaking behavior of the molten strand at the time of melt tension measurement. That is, when the take-up speed is increased, the melt tension increases abruptly, and when cutting, strain hardening is exhibited.

  When the melt flow rate is in the range of 10 g / 10 min to 50 g / 10 min, when producing an injection-foamed molded article, the mold cavity clearance is short even in molding having a thin portion of about 1 to 2 mm. There is a tendency that shots are less likely to occur, and continuous and stable molding tends to be performed.

  When the melt tension is 2 cN or more and exhibits strain hardening, a foamed molded product having a uniform fine cell of 2 times or more can be obtained, and it is easy to break the foam at the molten resin flow tip during injection molding. This is preferable because a silver streak or swirl mark that occurs due to the above tends to be difficult to occur, and a foamed molded article having an excellent surface appearance tends to be obtained.

  Examples of such a polypropylene resin include a branched structure obtained by irradiating a linear polypropylene resin, or a method of melt-mixing a linear polypropylene resin, a radical polymerization initiator, a conjugated diene compound, or the like. A modified polypropylene resin containing a high molecular weight component may be mentioned. Among these, a modified polypropylene-based resin obtained by melt-mixing a linear polypropylene resin, a radical polymerization initiator, and a conjugated diene compound is preferable because it can be manufactured at low cost because it does not require expensive equipment.

The linear polypropylene resin is a polypropylene resin having a linear molecular structure, and is a normal polymerization method, for example, a catalyst system obtained from a transition metal compound and an organometallic compound supported on a carrier (for example, Obtained in the presence of Ziegler-Natta catalyst). Specific examples include propylene homopolymers, block copolymers, and random copolymers, which are crystalline polymers. As a copolymer of propylene, a copolymer containing propylene in an amount of 75% by weight or more is preferable in that the crystallinity, rigidity, chemical resistance, etc., which are characteristics of the polypropylene resin, are maintained. The copolymerizable α-olefin is ethylene, 1-butene, isobutene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3,4-dimethyl-1-butene. , 1-heptene, 3-methyl-1-hexene, 1-octene, 1-decene, and the like, α-olefin having 2 or 4 to 12 carbon atoms, cyclopentene, norbornene, tetracyclo [6,2,1 ^1,8 , 1 ^3,6 ] -4-dodecene and other cyclic olefins, 5-methylene-2-norbornene, 5-ethylidene-2-norbornene, 1,4-hexadiene, methyl-1,4-hexadiene, 7-methyl-1,6 -Diene such as octadiene, vinyl chloride, vinylidene chloride, acrylonitrile, vinyl acetate, acrylic acid, methacrylic acid, maleic acid, ethyl acrylate, acrylic Butyl Le, methyl methacrylate, maleic anhydride, styrene, methyl styrene, vinyl toluene, and vinyl monomers such as divinylbenzene. Among these, ethylene and 1-butene are preferable in terms of improving cold brittleness resistance and low cost.

  Examples of the conjugated diene compound include butadiene, isoprene, 1,3-heptadiene, 2,3-dimethylbutadiene, 2,5-dimethyl-2,4-hexadiene, and these may be used alone or in combination. Also good. Among these, butadiene and isoprene are particularly preferable because they are inexpensive and easy to handle and the reaction easily proceeds uniformly.

  The addition amount of the conjugated diene compound is preferably 0.01 parts by weight or more and 20 parts by weight or less, and more preferably 0.05 parts by weight or more and 5 parts by weight or less with respect to 100 parts by weight of the linear polypropylene resin. If the amount is less than 0.01 parts by weight, the effect of the modification may be difficult to obtain, and if the amount exceeds 20 parts by weight, the effect is saturated, which may not be economical.

  Monomers copolymerizable with the conjugated diene compounds, such as vinyl chloride, vinylidene chloride, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, vinyl acetate, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, metal acrylate Salt, metal methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, stearyl acrylate, and other acrylic esters, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-methacrylic acid 2- Methacrylic acid esters such as ethylhexyl and stearyl methacrylate may be used in combination.

  The radical polymerization initiator generally includes peroxides, azo compounds, and the like, but those having a capability of extracting hydrogen from a polypropylene resin or the conjugated diene compound are preferable. Generally, ketone peroxides, peroxyketals, hydroperoxides are used. Organic peroxides such as oxides, dialkyl peroxides, diacyl peroxides, peroxydicarbonates, and peroxyesters are listed. Of these, those having particularly high hydrogen abstraction ability are preferred, such as 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, Peroxyketals such as n-butyl 4,4-bis (t-butylperoxy) valerate, 2,2-bis (t-butylperoxy) butane, dicumyl peroxide, 2,5-dimethyl-2,5 -Di (t-butylperoxy) hexane, α, α'-bis (t-butylperoxy-m-isopropyl) benzene, t-butylcumyl peroxide, di-t-butylperoxide, 2,5-dimethyl Diacyl peroxides such as dialkyl peroxides such as -2,5-di (t-butylperoxy) -3-hexyne and benzoyl peroxides Oxide, t-butyl peroxyoctate, t-butyl peroxyisobutyrate, t-butyl peroxylaurate, t-butyl peroxy 3,5,5-trimethylhexanoate, t-butyl peroxyisopropyl carbonate 1, peroxyesters such as 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxyacetate, t-butylperoxybenzoate, di-t-butylperoxyisophthalate A seed | species or 2 or more types is mentioned.

  The addition amount of the radical polymerization initiator is preferably 0.01 parts by weight or more and 10 parts by weight or less, more preferably 0.05 parts by weight or more and 2 parts by weight or less with respect to 100 parts by weight of the linear polypropylene resin. If the amount is less than 0.01 part by weight, the effect of reforming may be difficult to obtain, and if the amount exceeds 10 parts by weight, the effect of reforming may be saturated and not economical.

  The apparatus for reacting the linear polypropylene resin, the conjugated diene compound, and the radical polymerization initiator includes a roll, a kneader, a Banbury mixer, a Brabender, a single screw extruder, a kneader such as a twin screw extruder, a twin screw Examples of the surface renewal machine include a horizontal stirrer such as a biaxial multi-disk device, and a vertical stirrer such as a double helical ribbon stirrer. Among these, a kneader is preferably used, and an extruder is particularly preferable from the viewpoint of productivity.

  There is no particular limitation on the order and method of mixing and kneading (stirring) the linear polypropylene resin, the conjugated diene compound, and the radical polymerization initiator. The linear polypropylene-based resin, the conjugated diene compound, and the radical polymerization initiator may be mixed and then melt-kneaded (stirred). After the polypropylene-based resin is melt-kneaded (stirred), the conjugated diene compound or the radical initiator may be mixed. They may be mixed simultaneously or separately, collectively or divided. The temperature of the kneading (stirring) machine is preferably 130 to 300 ° C. in that the linear polypropylene resin melts and does not thermally decompose. The time is generally preferably 1 to 60 minutes.

In this way, the polypropylene resin used in the present invention can be produced. There is no restriction | limiting in the shape and magnitude | size of this polypropylene resin, A pellet form may be sufficient.
Moreover, the said polypropylene resin can be mixed with the same thing as the said linear polypropylene resin in the range which does not impair the effect of this invention. The mixing method is not particularly limited and can be performed by a known method. For example, dry blending of pellet-shaped resin using a blender, mixer, etc., melt mixing, melting and mixing in a solvent, etc. Can be mentioned. In the present invention, the method of dry blending and then subjecting to injection foam molding is preferable because it requires less heat history and decreases the melt tension.

  Next, the automotive door trim of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of an automobile door trim according to the present invention. 2 is a cross-sectional view taken along the line A-A ′ of FIG. 1 and an enlarged view of a portion B, FIG. 3 is a cross-sectional view of a door using the door trim of the present invention, and FIG. 4 is an example installed in an automobile.

  The automobile door trim 1 according to the present invention is mounted on the inside of a side wall door of an automobile. Usually, the place where the occupant's elbow hits is recessed, whereby the armrest 2 is formed. In many cases, the armrest 2 is attached with a button switch for opening and closing the window glass. Further, an inside handle opening 4 for opening and closing the door is provided above the door trim. A speaker grill 3 for attaching a speaker may be provided below the front door trim. Further, if necessary, a skin material such as a nonwoven fabric or soft leather may be attached around the armrest 2 for decoration.

  The door trim 1 of the present invention is characterized by comprising the thermoplastic resin injection foam molded body described above. FIG. 5 is an enlarged view of a portion B in FIG. 2, which is a cross-sectional view taken along line AA ′ of FIG. 1, in which the door trim 1 has a foam layer 6 and a non-foam layer 7 formed on the surface of the foam layer. It shows that it is an injection foam molding of a plastic resin.

  The average cell diameter of the foam layer 6 is preferably 500 μm or less, more preferably 200 μm or less, and the thickness of the non-foam layer 7 is preferably 10 μm or more and 1000 μm or less, more preferably 100 μm or more and 500 μm or less. When the average cell diameter of the foam layer 6 exceeds 500 μm, excellent rigidity may not be obtained. If the thickness of the non-foamed layer 7 is less than 10 μm, an excellent surface appearance cannot be obtained and the rigidity tends to be lowered, and if it exceeds 1000 μm, the lightness may be difficult to obtain.

  Moreover, the expansion ratio of the injection-foamed molded article is preferably 2 to 10 times, more preferably 3 to 6 times. When the expansion ratio is less than 2 times, it is difficult to obtain sufficient lightness and heat insulation properties, and when it exceeds 10 times, the rigidity tends to be significantly reduced. The expansion ratio here is a value obtained from the ratio of the specific gravity of the foamed molded product and the non-foamed molded product injection-molded under the same conditions except that no foaming agent is added.

FIG. 3 shows an example of an automobile door using the door trim 1 of the present invention. In FIG. 3, reference numeral 8 denotes an automobile door. The door 8 has a door outer panel 9, a door inner panel 10, a door trim 1, and a door glass 12 as a basic configuration. A sheet metal door outer panel 9 and a door inner panel 10 are joined in the middle, and a door glass 12 and a weather strip 13 are attached to the upper part. The door trim 1 of the present invention is mounted on the indoor side surface of the door inner panel 10. In addition, there is no restriction | limiting in particular about the method of attaching the door trim 1 to the door 8, A well-known method can be used, For example, the method using a some clip etc. are used. In this case, a sheet such as a door screen film may be interposed between the door inner panel 10 and the door trim 1 so that rainwater or the like does not enter the vehicle interior. In recent years, an energy absorbing material 11 may be disposed between the door 8 and the door trim 1 in order to cope with a side collision. Examples of the material of the energy absorber 11 include a hard urethane foam having a density of about 0.02 to 0.1 g / cm ³ and a polypropylene resin in-mold foam molded body having a density of about 0.06 to 0.08 g / cm ^3. Used.

  When installing the door 8 (front side) using the door trim 1 of the present invention in the automobile compartment, as illustrated in FIG. 4, it can be attached in the same manner as when installing a normal door. The door trim 1 of the present invention is an injection foam molded article having a high expansion ratio made of a thermoplastic resin and having a foam layer 6 and a non-foam layer 7 formed on the surface of the foam layer. Since it has the characteristics and rigidity, it can contribute to the reduction of the weight of the vehicle body.

  On the other hand, since the door trim 1 of the present invention has an excellent surface appearance, the continuity and unity with other interior parts such as the installation panel 19 are not impaired. If necessary, a skin material such as a nonwoven fabric or soft leather may be attached for decoration as described above. Since the door trim 1 of the present invention is a foam, it is excellent in heat insulation, but the heat insulation may be further improved by pasting such a nonwoven fabric or soft leather.

It is the perspective view which showed an example of this invention door trim. FIG. 2 is a cross-sectional view taken along line A-A ′ of FIG. 1 and an enlarged view of a B portion. It is an example of the motor vehicle door using the door trim of this invention. It is the figure which showed an example of the usage condition of this invention door trim.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door trim 2 Armrest 3 Speaker grill 4 Inside handle opening part 5 Enlarged view of the AA 'line cross section of FIG. 1 6 Foamed layer 7 Non-foamed layer 8 Door (front side)
9 Door outer panel 10 Door inner panel 11 Impact energy absorber 12 Door glass 13 Weather strip 14 Door (rear side)
15 Seat 16 Roof side inner garnish 17 Center pillar garnish 18 Front pillar garnish 19 Installation panel

Claims (4)

  A door trim mounted on the side wall door of an automobile, the door trim comprising a foamed layer and a non-foamed layer formed on the surface of the foamed layer. A door trim for automobiles.   The foaming ratio of the injection-foamed molded article is 2 to 10 times, the average cell diameter of the foamed layer is 500 µm or less, and the non-foamed layer is 10 to 1000 µm in thickness. Automobile door trim.   The injection-foamed molded product is injection-filled with a melt of a thermoplastic resin composition containing a foaming agent into a mold composed of a fixed mold and a movable mold capable of moving forward and backward, and then movable mold The automobile door trim according to any one of claims 1 and 2, wherein the thermoplastic resin is manufactured by retreating the foamed thermoplastic resin.   The thermoplastic resin is made of a polypropylene resin having a melt flow rate of 10 g / 10 min to 50 g / 10 min, a melt tension of 2 cN or more, and exhibiting strain hardening. A door trim for an automobile according to claim 1.

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