JP2012092159A - Automotive interior part having excellent heat-resistant rigidity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide automotive interior parts, to which leather is attached, obtained by molding a fiber-containing thermoplastic resin composition and having not only excellent impact strength, chemical resistance, and dimensional stability but also excellent heat-resistant rigidity.SOLUTION: The automotive interior parts to which leather is attached are obtained by molding the fiber-containing thermoplastic resin composition. The fiber-containing thermoplastic resin composition is a thermoplastic resin composition containing: 40-60 pts.wt. of a rubber-enforced vinyl-based resin composition (D) comprising 40-70 pts.wt. of a graft copolymer (A), 10-20 pts.wt. of an unsaturated carboxylic acid-modified copolymer (B), and 10-50 pts.wt. of a copolymer (C); and 40-60 pts.wt. of a polyamide resin (E). The fiber-containing thermoplastic resin composition satisfies formula (1) and contains a fibrous filler satisfying formula (2). Formula (1): P=n/(n+k), wherein 0.5<P≤0.8; and formula (2): 0.25≤w/(w+100×P)≤0.50, wherein k is a content (pts.wt.) of an acetone-soluble portion derived from the rubber-reinforced vinyl-based resin composition (D) based on 100 pts.wt. of the thermoplastic resin composition; n is a content (pts.wt.) of the polyamide resin (E) based on 100 pts.wt. of the thermoplastic resin composition; and w is a blended amount (pts.wt.) of the fibrous filler based on 100 pts.wt. of the thermoplastic resin composition.

Description

  The present invention relates to an automotive interior part to which genuine leather is attached, which is obtained by molding a fiber-containing thermoplastic resin composition having not only excellent impact strength, chemical resistance and dimensional stability but also excellent heat resistance rigidity. Is. Specifically, it is obtained by molding a fiber-containing thermoplastic resin composition containing a specific amount of fibrous filler with respect to a thermoplastic resin composition comprising a specific rubber-reinforced vinyl resin composition and a specific polyamide resin. The present invention relates to automotive interior parts to which genuine leather is attached.

Conventionally, PP (polypropylene resin) -based resins have been used for automobile interior parts from the viewpoint of mechanical properties and economy. On the other hand, with the upgrading of automobile interiors, genuine leather has been attached to these parts. However, since the conventional PP resin lacks rigidity at high temperatures, there are cases where problems such as deformation of the base material occur due to shrinkage of genuine leather.
For this problem, it is conceivable to use an engineering plastic having a heat resistance higher than that of the PP resin.

  The polyamide resin represented by 6-nylon has excellent moldability, heat resistance, impact resistance, chemical resistance, abrasion resistance, etc., but on the other hand, the impact strength in the dry state is reduced, dimensional change due to moisture absorption, There is a problem of a decrease in tensile strength. Further, rubber-reinforced vinyl resins typified by ABS resins also have excellent impact resistance, moldability, gloss, etc., but have a problem that they are inferior in chemical resistance and heat rigidity.

In order to maintain the features of polyamide resin and rubber reinforced styrene resin, and to improve the chemical resistance, which is a defect of rubber reinforced styrene resin, and the dimensional change at the time of moisture absorption, which is a defect of polyamide resin, A polymer alloy obtained by blending a copolymer as a compatibilizing agent and a resin composition blended with glass fiber have been proposed (Patent Document 1: JP-A-1-158, Patent Document 2: JP-A-10-10). No. 158508, Patent Document 3: JP 2000-17170 A).
However, even with the prior art, improvement in fluidity and dimensional stability during moisture absorption has been insufficient.

JP-A-1-158

JP-A-10-158508

JP 2000-17170 A

  The object of the present invention is to mold a fiber-containing thermoplastic resin that has the characteristics of a rubber-reinforced vinyl resin / polyamide resin alloy and is excellent in fluidity, impact strength, chemical resistance, dimensional stability, and heat resistance rigidity. The object is to provide a vehicle interior part to which genuine leather is attached.

That is, the present invention graft-polymerizes 20 to 80% by weight of a rubbery polymer with 10 to 70% by weight of an aromatic vinyl monomer and 10 to 70% by weight of another monomer copolymerizable therewith. 40 to 70 parts by weight of the graft copolymer (A) (based on the graft copolymer (A) (100% by weight)), 0.5 to 20% by weight of an unsaturated carboxylic acid monomer, Unsaturated carboxylic acid-modified copolymer (B) 10 obtained by polymerizing 50 to 89.5% by weight of an aromatic vinyl monomer and 10 to 49.5% by weight of another monomer copolymerizable therewith To 20 parts by weight (based on the unsaturated carboxylic acid-modified copolymer (B) (100% by weight)), 30 to 90% by weight of the aromatic vinyl monomer and other monomers copolymerizable therewith. 10 to 70% by weight of a polymer (excluding unsaturated carboxylic acid monomer) 10 to 50 parts by weight of the copolymer (C) (based on the copolymer (C) (100% by weight)), and 40 to 60 parts by weight of the rubber-reinforced vinyl resin composition (D) (( A), (B) and (C) are 100 parts by weight.) And polyamide resin (E) 40-60 parts by weight using one or more of polyamide 610, polyamide 1010 and polyamide 11 (The total of the rubber-reinforced vinyl resin composition (D) and the polyamide resin (E) is 100 parts by weight), and occupies 100 parts by weight of the thermoplastic resin composition The content of the acetone-soluble part derived from the rubber-reinforced vinyl resin composition (D) and the polyamide resin (E) satisfies the following formula (1) and is 100 parts by weight with respect to 100 parts by weight of the thermoplastic resin composition. Fiber satisfying formula (2) Obtained by molding the fiber-containing thermoplastic resin composition containing a filler, an automobile interior part leather is affixed.
Formula (1) P = n / (n + k) where 0.5 <P ≦ 0.8
Formula (2) 0.25 ≦ w / (w + 100 × P) ≦ 0.50
k: acetone-soluble part (parts by weight) derived from the rubber-reinforced vinyl resin composition (D) in 100 parts by weight of the thermoplastic resin composition
n: Content (parts by weight) of polyamide resin (E) in 100 parts by weight of the thermoplastic resin composition
w: blending amount of fibrous filler with respect to 100 parts by weight of thermoplastic resin composition (parts by weight)

  INDUSTRIAL APPLICABILITY The present invention can provide a vehicle interior part to which genuine leather having excellent fluidity, impact strength, chemical resistance, dimensional stability, and excellent heat resistance rigidity is attached.

Hereinafter, the automotive interior part to which the genuine leather of the present invention is attached will be described in detail.
The rubber-reinforced vinyl resin composition (D) that can be used in the present invention is composed of 20 to 80% by weight of a rubbery polymer, 10 to 70% by weight of an aromatic vinyl monomer, and other copolymerizable with this. 40 to 70 parts by weight of a graft copolymer (A) obtained by graft polymerization of 10 to 70% by weight of a monomer (based on the graft copolymer (A) (100% by weight)), unsaturated carboxylic acid Polymerizing 0.5 to 20% by weight of an acid monomer, 50 to 89.5% by weight of an aromatic vinyl monomer and 10 to 49.5% by weight of another monomer copolymerizable therewith 10 to 20 parts by weight of the unsaturated carboxylic acid-modified copolymer (B) (based on the unsaturated carboxylic acid-modified copolymer (B) (100% by weight)), the aromatic vinyl monomer 30 to 90% by weight and other monomers copolymerizable therewith (unsaturated carbon From 10 to 50 parts by weight of the copolymer (C) obtained by polymerizing 10 to 70% by weight (excluding the acid monomer) (based on the copolymer (C) (100% by weight)). The resin composition (the sum of (A), (B), and (C) is 100 parts by weight), and the acetone-soluble part is 100 parts by weight of the rubber-reinforced vinyl resin composition (D). It is preferable that it is 10-50 weight part.

  The rubbery polymer constituting the graft copolymer (A) includes polybutadiene, butadiene-styrene copolymer, butadiene-acrylonitrile copolymer, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer. Polymers, diene (co) polymers such as isobutylene-isoprene copolymers, hydrogenated rubbers of these diene (co) polymers, ethylene-propylene copolymers, ethylene-propylene-nonconjugated diene copolymers Examples thereof include a copolymer, an ethylene-butene-1-nonconjugated diene copolymer, an acrylic rubber, and the like, and one kind or two or more kinds can be used. Of these, polybutadiene, butadiene-styrene copolymer, ethylene-propylene-nonconjugated diene copolymer, and acrylic rubber are preferable, and polybutadiene and butadiene-styrene copolymer are particularly preferable.

  Although there is no restriction | limiting in particular about the weight average particle diameter of a rubber-like polymer, It is preferable that it is 0.05-2.0 micrometers. More preferably, it is 0.10 to 1.0 μm. The rubbery polymer having the particle size may be an emulsion-polymerized rubber (latex) or a rubber (latex) enlarged by mechanically and chemically treating a small particle-size rubber latex by short-time emulsion polymerization. Furthermore, a dissolved rubber obtained by cutting a dry rubber and then dissolving it in a monomer or a solvent is also possible.

  Examples of the aromatic vinyl monomer constituting the graft copolymer (A) include styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, vinyltoluene, methyl-α-methylstyrene, brominated styrene. 1 or 2 or more types can be used, and styrene and α-methylstyrene are particularly preferable.

Other copolymerizable monomers include vinyl cyanide monomers, (meth) acrylic acid ester monomers, unsaturated carboxylic acid monomers, and maleimide monomers. Examples include at least one selected monomer.
Examples of the vinyl cyanide monomer include acrylonitrile and methacrylonitrile, and acrylonitrile is particularly preferable. Examples of the (meth) acrylic acid ester monomer include methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and the like, and methyl methacrylate is particularly preferable. Examples of the unsaturated carboxylic acid monomer include acrylic acid, methacrylic acid, (anhydrous) maleic acid, fumaric acid, itaconic acid, and the like, and (meth) acrylic acid and (anhydrous) maleic acid are preferable. Examples of the maleimide monomer include maleimide, N-methylmaleimide, N-phenylmaleimide, N- (2-methylphenyl) maleimide, N- (4-hydroxyphenyl) maleimide, N-cyclohexylmaleimide, and the like. In particular, N-phenylmaleimide and N-cyclohexylmaleimide are preferable.

Although there is no restriction | limiting in particular about the grafting rate in a graft copolymer (A), Preferably it is 20 to 150%. The graft ratio is obtained by the following formula after the graft copolymer obtained by graft polymerization is dissolved in acetone and separated into a soluble part and an insoluble part.
Graft ratio (%) = [weight of acetone-insoluble matter−weight of rubbery polymer in graft copolymer] / [weight of rubbery polymer in graft copolymer] × 100
The graft ratio can be appropriately adjusted by changing the polymerization conditions such as the ratio of the rubbery polymer and the monomer during graft polymerization and the addition rate of the monomer. Moreover, there is no restriction | limiting in particular about the manufacturing method of a graft copolymer (A), The usual well-known methods, such as block polymerization, solution polymerization, block suspension polymerization, suspension polymerization, and emulsion polymerization, are used. From the viewpoint of graft rate, emulsion polymerization is preferred.

  The unsaturated carboxylic acid-modified copolymer (B) that can be used in the present invention is 0.5 to 20% by weight of an unsaturated carboxylic acid monomer and 50 to 89.5% by weight of an aromatic vinyl monomer. % And a copolymer obtained by polymerizing 10 to 49.5% by weight of another monomer copolymerizable therewith (based on the unsaturated carboxylic acid-modified copolymer (B) (100% by weight)). ).

Examples of the unsaturated carboxylic acid-based monomer constituting the unsaturated carboxylic acid-modified copolymer (B) include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, and the like. Although it can be used, methacrylic acid is particularly preferred.
As the aromatic vinyl monomer and other monomers copolymerizable therewith, the same monomers as those exemplified in the section of the graft copolymer (A) can be used.
As other copolymerizable monomers, acrylonitrile, methyl methacrylate and the like are preferable.

In the production of the unsaturated carboxylic acid-modified copolymer (B), a known emulsion polymerization method, bulk polymerization method, suspension polymerization method, or solution polymerization method can be employed.
The reduced viscosity of the unsaturated carboxylic acid-modified copolymer (B) is not particularly limited, but is preferably 0.2 to 1.2 dl / g. The reduced viscosity can be appropriately adjusted depending on the polymerization temperature, the monomer addition method, the initiator used, and the type and amount of a polymerization chain transfer agent such as t-dodecyl mercaptan.

  The copolymer (C) that can be used in the present invention is 30 to 90% by weight of an aromatic vinyl monomer and another monomer copolymerizable therewith (however, unsaturated carboxylic acid monomer) A copolymer obtained by polymerizing 10 to 70% by weight (excluding the body) (based on copolymer (C) (100% by weight)). As the aromatic vinyl monomer constituting the copolymer (C) and other monomers copolymerizable therewith, the same monomers as those exemplified in the section of the graft copolymer (A) are used. can do. As the aromatic vinyl monomer, styrene and α-methylstyrene are preferable. Other copolymerizable monomers are preferably acrylonitrile, methyl methacrylate, and N-phenylmaleimide.

  In the production of the copolymer (C), a known emulsion polymerization method, bulk polymerization method, suspension polymerization method, or solution polymerization method can be employed. Although there is no limitation about the reduced viscosity of a copolymer (C), it is preferable that it is the range of 0.3-1.2 dl / g. The reduced viscosity can be appropriately adjusted depending on the polymerization temperature, the monomer addition method, the initiator used, and the type and amount of a polymerization chain transfer agent such as t-dodecyl mercaptan.

  The polyamide resin (E) that can be used in the present invention needs to be a polyamide resin using one or more of polyamide 610, polyamide 1010, and polyamide 11. Polyamide 6T / 6I, polyamide 6 / 6T, polyamide 66 / 6T, polyamide MXD6 polytrimethylhexamethylene terephthalamide, polybis (4-aminocyclohexyl) methane dodecamide, polybis (3-methyl-4-aminocyclohexyl) methane dodecamide, Polymetaxylylene adipamide, polyamide 11T, polyundecamethylene hexahydroterephthalamide and the like are not preferable because of poor dimensional stability. Note that “I” indicates an isophthalic acid component, and “T” indicates a terephthalic acid component.

  The fibrous filler that can be used in the present invention is not limited at all, and examples thereof include glass fiber, carbon fiber, aramid fiber, alumina fiber, silicon carbide fiber, and metal fiber. Glass fiber and carbon fiber are particularly preferable.

  The blending ratio of the graft copolymer (A), the unsaturated carboxylic acid-modified copolymer (B) and the copolymer (C) in the rubber-reinforced vinyl resin composition (D) used in the present invention is as follows: : 40 to 70 parts by weight, (B): 10 to 20 parts by weight, (C): 10 to 50 parts by weight (the sum of (A), (B) and (C) is 100 parts by weight). .

The thermoplastic resin composition used in the present invention is a resin composition containing a rubber-reinforced vinyl resin composition (D) and a polyamide resin (E), and the blending ratio is a rubber-reinforced vinyl resin composition (D). : 40-60 parts by weight, polyamide resin (E): 40-60 parts by weight (the total of the rubber-reinforced vinyl resin composition (D) and the polyamide resin (E) is 100 parts by weight). Furthermore, the content of the acetone soluble part derived from the rubber-reinforced vinyl resin composition (D) and the polyamide resin (E) in 100 parts by weight of the thermoplastic resin composition satisfies the following formula (1), and It is necessary for the thermoplastic resin composition to contain a fibrous filler that satisfies the following formula (2) with respect to 100 parts by weight of the thermoplastic resin composition. The acetone-soluble part is obtained by dissolving 2 g of rubber-reinforced vinyl resin composition (D) in 60 ml of acetone, concentrating the supernatant separated by centrifugation using an evaporator, and adding the concentrated liquid to an appropriate amount of methanol. It is the ratio to the original weight of the resin component which was dripped and precipitated.
Acetone soluble part = (dry weight of methanol precipitate) / original weight × 100 (% by weight)
Formula (1) P = n / (n + k), where 0.5 <P ≦ 0.8
Formula (2) 0.25 ≦ w / (w + 100 × P) ≦ 0.50
k: acetone-soluble part (parts by weight) derived from the rubber-reinforced vinyl resin composition (D) in 100 parts by weight of the thermoplastic resin composition
n: Content (parts by weight) of polyamide resin (E) in 100 parts by weight of the thermoplastic resin composition
w: blending amount of fibrous filler with respect to 100 parts by weight of thermoplastic resin composition (parts by weight)

If the value of the formula (1) is smaller than 0.5, the polyamide component ratio in the continuous phase is reduced, the chemical resistance is lowered, and a large amount of fibrous filler is blended in order to obtain heat resistance rigidity. This is not preferable because the fluidity required during molding is reduced. On the other hand, if the value of formula (1) exceeds 0.8, the ratio of the polyamide component occupying the continuous phase becomes too large, and the dimensional change due to sink marks or moisture absorption due to crystallization increases, which is not preferable.
Even with a thermoplastic resin composition satisfying the formula (1), if the value of the formula (2) is smaller than 0.25, sufficient heat-resistant rigidity cannot be obtained, and the value of the formula (2) is 0. When it is larger than .50, the fluidity is lowered, which is not preferable.

  The mixing order of the graft copolymer (A), the unsaturated carboxylic acid-modified copolymer (B), the copolymer (C), the polyamide resin (E) and the fibrous filler and the state thereof are not limited, Graft copolymer (A), unsaturated carboxylic acid-modified copolymer (B), copolymer (C), polyamide resin (E) and fibrous filler were simultaneously mixed, and specific two components were premixed. Thereafter, a method of mixing the remaining components is exemplified. In the melt mixing, a Banbury mixer, a roll, an extruder, or the like can be used.

  When mixing, if necessary, other plant-derived thermoplastic resins such as polylactic acid, polycarbonate, polyphenylene ether, and other antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, lubricants, Known additives such as dyes, pigments, plasticizers, flame retardants, release agents, reinforcing materials, fillers, and the like can be blended.

  An automotive interior part to which the genuine leather of the present invention is attached is a molded product obtained by injecting the above-mentioned fiber-containing thermoplastic resin composition into a cavity constituted by a mold having the shape of an automotive interior part. It can be obtained by adhering genuine leather with an adhesive. Examples of automobile interior parts include instrument panels, pillars, door trims, consoles, glove boxes, and armrests. Genuine leather is not particularly limited with respect to animal types and parts, and as the adhesive, urethane resin-based adhesives, acrylic resin-based adhesives, epoxy resin-based adhesives, and the like are used. Moreover, in order to raise cushioning property, you may insert the foaming molding and fibrous molding with cushioning properties between a molded article and genuine leather.

  The present invention is described in detail below. In addition, this invention does not receive a restriction | limiting at all by this. Moreover, both parts and% are shown on a weight basis.

<Graft Copolymer (A) -1> (Emulsion Polymerization Method)
In a nitrogen-replaced glass reactor, 60 parts by weight of polybutadiene latex having a weight average particle size of 0.4 μm, 140 parts by weight of deionized water, 0.06 parts by weight of lactose, and 0.025 parts by weight of anhydrous sodium pyrophosphate And an aqueous solution in which 0.001 part by weight of ferrous sulfate was dissolved was added, and then the temperature was raised to 65 ° C. Thereafter, 1.0 part by weight of potassium oleate and 1 part by weight of cumene hydroperoxide were dissolved in a mixed solution of 10 parts by weight of acrylonitrile, 30 parts by weight of styrene, 0.3 part by weight of tarsia decyl mercaptan and 20 parts by weight of deionized water. The resulting aqueous emulsifier solution was continuously added over 5 hours. After continuous addition, the temperature was raised to 70 ° C., polymerization was continued for 2 hours to complete the polymerization, salting out, dehydration, and drying to obtain graft copolymer (A) -1. When the graft ratio of the graft copolymer (A) -1 was measured, it was 40%.

<Unsaturated carboxylic acid-modified copolymer (B)>
After adding 100 parts by weight of deionized water to a nitrogen-replaced glass reactor, the temperature was raised, and when 60 ° C. was reached, 0.3 part of potassium persulfate, 5 parts of methacrylic acid, 70 parts of styrene, 25 parts of acrylonitrile Then, 6% of a monomer mixed solution composed of 1.6 parts of terrierid decyl mercaptan and 10% of an aqueous emulsifier solution in which 1 part of sodium dodecylbenzenesulfonate was dissolved in 20 parts of deionized water were added. Thereafter, the temperature was raised to 65 ° C., and the remaining monomer mixture and the aqueous emulsifier solution were continuously added. Thereafter, the temperature was raised to 70 ° C. to complete the polymerization. After salting out using calcium chloride, dehydration and drying were performed to obtain an unsaturated carboxylic acid-modified copolymer (B).

<Copolymer (C)>
(C) -1: A copolymer (C) -1 comprising 70 parts of styrene and 30 parts of acrylonitrile was obtained by a known bulk polymerization method.
(C) -2: A copolymer (C) -2 comprising 70 parts by weight of α-methylstyrene and 30 parts by weight of acrylonitrile was obtained by a known emulsion polymerization method.
(C) -3: Styrene / N-phenylmaleimide / maleic anhydride copolymer (Denka IP MS-NC (trade name) manufactured by Denki Kagaku Kogyo Co., Ltd.)

<Polyamide 11 (E-1)>
"Rilsan BMN O" manufactured by Arkema Co., Ltd.
<Polyamide 610 (E-2)>
“Grillamid XE4019” manufactured by Ms. Chemie Japan
<Polyamide 1010 (E-3)>
“Grillon XE1306” manufactured by Ms. Chemie Japan
<Polyamide 6 (E-4)>
Unitika Ltd. “Unitika Nylon A1030BRL”
<Polyamide 66 (E-5)>
“Leona 1300S” manufactured by Asahi Kasei Chemicals Corporation

<Fibrous filler>
Glass fiber Nitto Boseki chopped strand CSF 3PE-332S

[Examples and Comparative Examples]
Based on the composition ratio shown in Table 1, the above graft copolymer (A), unsaturated carboxylic acid-modified copolymer (B), and copolymer (C) are mixed and melt-kneaded in an extruder. A rubber-reinforced vinyl resin composition (D) was obtained. Table 1 shows the measurement results of the acetone soluble part of the obtained rubber-reinforced vinyl resin composition (D). The rubber-reinforced vinyl resin composition (D) occupying 100% by weight of the thermoplastic resin composition from the ratio of the obtained acetone soluble part and the rubber-reinforced vinyl resin composition (D) contained in the thermoplastic resin composition. ) Derived acetone soluble part. Next, based on the composition ratios shown in Tables 2 and 3, a mixture of the rubber-reinforced vinyl resin composition (D) and the polyamide resin (E) is a twin-screw extruder (TEX-44S, set temperature 280 ° C.). Then, the fibrous filler was kneaded by side feed and pelletized to obtain various compositions.

  Tables 2 and 3 show the results of preparing various test pieces of the obtained various compositions with an injection molding machine (set temperature: 235 ° C., mold temperature: 60 ° C.) and evaluating physical properties. In addition, each evaluation method is shown below.

(1) Impact strength: Measured Charpy impact value with a notch at 4 mm thickness in accordance with ISO 179. Unit: kJ / m ²
(2) Heat-resistant rigidity: Based on ISO 527, after maintaining at 4 mm thickness at 110 ° C. for 1 hour, the tensile elastic modulus is measured. Unit: MPa
(3) Dimensional stability: long side after injection molding with a flat plate mold having dimensions of 150 mm × 90 mm × 3 mmt, and leaving the obtained flat plate in a constant temperature room at 23 ° C. and 50% RH for 24 hours The length of the long side after adjusting the length (150 mm direction) to L0, absorbing the plate for 72 hours at 60 ° C. and 90% RH, and adjusting the state at 23 ° C. and 50% RH for 24 hours. In the case of L1, the evaluation was performed according to the following three-stage criteria based on the value represented by the following formula.
(L1-L0) / L0 × 100
○: 0 to 0.7
Δ: 0.7 to 1.2
×: 1.2 <
(4) Chemical resistance: Cut into a 40 mm wide strip from a flat plate injection molded with a flat plate mold with dimensions of 150 mm x 90 mm x 3 mmt, and measure critical strain by a 1/4 inch ellipse method at room temperature. Evaluation was performed according to the following three-stage criteria.
Critical strain ○: 0.7 or more or no crack Δ: 0.3 or more, less than 0.7 ×: less than 0.3 (5) Fluidity: Measured melt volume rate at 240 ° C. and a load of 10 kgf in accordance with ISO1133 did. Unit; g / 10 minutes

  From the above results, it is excellent in chemical resistance, dimensional stability, and heat resistance. Therefore, even in actual-size injection-molded products, a beautiful molded product can be obtained without causing deformation of the base material due to shrinkage of genuine leather. Can be guessed.

  Since the present invention is excellent in impact strength, chemical resistance, dimensional stability, and excellent in heat-resistant rigidity, it can be suitably used as an automobile interior part to which genuine leather is attached.

Claims (2)

Graft copolymer obtained by graft-polymerizing 10 to 70% by weight of an aromatic vinyl monomer and 10 to 70% by weight of another monomer copolymerizable therewith to 20 to 80% by weight of a rubbery polymer (A) 40 to 70 parts by weight (based on graft copolymer (A) (100% by weight)), unsaturated carboxylic acid monomer 0.5 to 20% by weight, aromatic vinyl monomer 10 to 20 parts by weight (unsaturated carboxylic acid-modified copolymer (B) obtained by polymerizing 50 to 89.5% by weight of the polymer and 10 to 49.5% by weight of other monomers copolymerizable therewith) (Based on the saturated carboxylic acid-modified copolymer (B) (100% by weight)), 30 to 90% by weight of an aromatic vinyl monomer and other monomers copolymerizable therewith (however, Copolymer (C) 1 obtained by polymerizing 10 to 70% by weight (excluding saturated carboxylic acid monomers) 50 to 60 parts by weight (based on copolymer (C) (100% by weight)), rubber-reinforced vinyl resin composition (D) 40 to 60 parts by weight ((A), (B) and ( C) is a total of 100 parts by weight.) And a thermoplastic resin composition containing 40 to 60 parts by weight of polyamide resin (E) using one or more of polyamide 610, polyamide 1010, and polyamide 11 (The total of the rubber-reinforced vinyl resin composition (D) and the polyamide resin (E) is 100 parts by weight), and the rubber-reinforced vinyl resin composition occupies 100 parts by weight of the thermoplastic resin composition A fiber in which the content of the acetone soluble part derived from (D) and the polyamide resin (E) satisfies the following formula (1) and satisfies the following formula (2) with respect to 100 parts by weight of the thermoplastic resin composition: Containing fine filler Obtained by molding the thermoplastic resin composition containing, automotive interior parts leather is affixed.
Formula (1) P = n / (n + k) where 0.5 <P ≦ 0.8
Formula (2) 0.25 ≦ w / (w + 100 × P) ≦ 0.50
k: acetone-soluble part (parts by weight) derived from the rubber-reinforced vinyl resin composition (D) in 100 parts by weight of the thermoplastic resin composition
n: Content (parts by weight) of polyamide resin (E) in 100 parts by weight of the thermoplastic resin composition
w: blending amount of fibrous filler with respect to 100 parts by weight of thermoplastic resin composition (parts by weight)   The automotive interior part to which genuine leather according to claim 1 is attached.