JP2008106166A - Thermoplastic resin composition, its molded product and outer panel member of vehicle using the molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition capable of increasing the adhesion of a coating film, a thermoplastic resin molded product, and an outer panel member of a vehicle. <P>SOLUTION: The thermoplastic resin composition comprises a polyamide resin (A) and at least one solid substance (B) chosen from an polyisoprene rubber, natural rubber, polyethylene and polypropylene, characterized in that, when the surface of the thermoplastic resin composition is analyzed by total reflection infrared spectroscopy, the peak ratio of the peak intensity of a carboxyl group around 1,700-1,715 cm<SP>-1</SP>to the peak intensity of an amide group around 1,630 cm<SP>-1</SP>is ≥0.016. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a thermoplastic resin composition, a thermoplastic resin molded article made of such a composition, and a vehicle outer plate member using the thermoplastic resin molded article.

  For example, in various industrial members such as automobile members, molded products made of resin materials having excellent characteristics such as lightness and moldability are widely used. For example, in automotive parts, as part of efforts to further reduce the weight of the vehicle body, it is considered that the outer plate members of vehicles such as fender panels and bonnets are made from metal to resin. It is used for practical use.

Various resin materials that can be applied to such a vehicle outer plate member are known. For example, Patent Document 1 discloses a polyamide resin, a hydrogenated block copolymer, and a modified hydrogenated block copolymer. And a thermoplastic resin composition containing an inorganic filler, conductive carbon black, and an ethylene vinyl alcohol copolymer are disclosed, and are described as being useful as materials for manufacturing automobile exterior parts. .
JP 2006-28223 A

  By the way, when carrying out the so-called online painting in which the outer plate member of the vehicle such as a fender panel is made of resin, and the entire vehicle body is painted on the painting line in a state where the outer plate member is assembled to the vehicle body, Problems can arise. For example, when a thermoplastic resin composition is used as the resin material and three layers of intermediate coating, base coating, and clear coating are applied to the outer plate member made of this thermoplastic resin composition, the outer plate member and The coating film may be peeled off during intermediate coating.

  On the other hand, by applying an undercoat (primer) coating to the outer plate member made of a thermoplastic resin composition, an intermediate coating, a base coating, and a clear coating are applied to improve the adhesion of the coating film and thereby adhere to the coating film. However, in such a case, it is necessary to add a step of applying a primer coating to the coating line, and it is necessary to add a painting step and a painting facility, resulting in high costs. .

  Therefore, in the case of the outer plate member made of a thermoplastic resin material, it is possible to improve the adhesion of the coating film and ensure the coating film adhesion without applying the undercoat when forming the coating film on the outer plate member. It has been demanded. Moreover, also in other various industrial members, when forming a coating film in the molded article shape | molded using a thermoplastic resin composition, it is desired to improve the adhesiveness of a coating film.

  Accordingly, the present invention has been made in view of the above technical problem, and provides a thermoplastic resin composition and a thermoplastic resin molded article that can enhance the adhesion of a coating film, and a vehicle outer plate member. Objective.

The inventors of the present application have conducted various tests and studies. As a result, in the thermoplastic resin mainly composed of a polyamide resin, the coating film adhesion to the thermoplastic resin is such that the surface of the thermoplastic resin is totally reflected by infrared spectroscopy. It was found to have a correlation with the peak ratio of the peak intensity of the carboxyl groups near 1700～1715Cm ^-1 to the peak intensity of the amide groups in the vicinity of 1630 cm ^-1 when analyzed by spectroscopy. In addition, based on this knowledge, we developed a thermoplastic resin with high coating film adhesion.

The thermoplastic resin composition according to the invention of claim 1 of the present application (first invention) is obtained as a result of the above research and development activities, and includes a polyamide resin (A) and a carboxyl in the chemical structure. A thermoplastic resin composition comprising a solid substance and / or a liquid substance (B) having a group and / or a carboxyl group in the chemical structure by a predetermined chemical structure change, when outside spectrum method was analyzed surface of the thermoplastic resin composition, the peak ratio of the peak intensity of the carboxyl groups near 1700～1715Cm ^-1 to the peak intensity of the amide groups in the vicinity of 1630 cm ^-1 is 0.016 or more It is characterized by being.

Here, when the surface of the thermoplastic resin composition was analyzed by total reflection infrared spectroscopy, the peak intensity peak of the carboxyl group near 1700 to 1715 cm ^{−1 with} respect to the peak intensity of the amide group near 1630 cm ^−1. The ratio of 0.016 or more can improve the adhesion of the coating film to the thermoplastic resin composition, and can be applied to the thermoplastic resin composition using an existing paint used for metal members and the like. This is because, when the film is formed, the adhesion of the coating film can be ensured without applying primer coating.

  Further, the invention of claim 2 of the present application (second invention) is characterized in that in the first invention, the chemical structure has a carboxyl group and / or a predetermined chemical structure change causes a carboxyl group to be contained in the chemical structure. The resulting solid substance and / or liquid substance (B) is at least one of isoprene rubber, natural rubber, polyethylene, and polypropylene.

  Further, the invention of claim 3 of the present application (third invention) is characterized in that in the first or second invention, an acid-modified elastomer (C) is further contained.

  Furthermore, the invention of claim 4 of the present application (fourth invention) is that, in the third invention, the acid-modified elastomer (C) is a modified olefin copolymer or a modified styrene copolymer. It is a feature.

  Still further, the invention of claim 5 (fifth invention) is based on the fourth invention, wherein the acid-modified elastomer (C) is a modified ethylene butene copolymer, modified ethylene propylene copolymer or modified styrene ethylene. It is a butadiene styrene terpolymer.

  Still further, the invention of claim 6 (sixth invention) further includes a filler (D) in any one of the first to fifth inventions, and the filler (D) is granular. The average particle size is 0.08 to 0.7 μm.

  The reason why the filler (D) is made granular and the average particle size is 0.08 to 0.7 μm is that heat resistance and impact resistance can be improved in a balanced manner. If the diameter of the filler (D) is made extremely fine, aggregation between particles occurs, but by setting the average particle size to 0.08 to 0.7 μm, aggregation is suppressed, and heat resistance and impact resistance. Can be improved with an excellent balance.

  Furthermore, the invention of claim 7 of the present application (seventh invention) is characterized in that, in the sixth invention, the filler (D) is calcium carbonate.

  Furthermore, the invention of claim 8 (eighth invention) is characterized in that, in any one of the first to seventh inventions, the polyamide resin (A) is polyamide 9T. is there.

  The thermoplastic resin molded article according to the invention of claim 9 (the ninth invention) is characterized by being molded by the thermoplastic resin composition according to any one of the first to eighth inventions. Is.

  Furthermore, the vehicle outer plate member according to the invention of claim 10 (tenth invention) is formed by the thermoplastic resin molded product of the ninth invention.

According to the first invention of the present application, when the surface of the thermoplastic resin composition is analyzed by total reflection infrared spectroscopy, a carboxyl in the vicinity of 1700 to 1715 cm ^{−1 with} respect to the peak intensity of the amide group in the vicinity of 1630 cm ^−1. By using a thermoplastic resin composition having a peak intensity peak ratio of 0.016 or more, the adhesion of the coating film can be enhanced. When forming a coating film on the thermoplastic resin composition using existing paint used for metal parts, etc., specifically when applying three layers of intermediate coating, base coating, and clear coating Furthermore, the adhesion of the coating film can be ensured without applying primer coating.

  Further, according to the second invention of the present application, the solid substance and / or the liquid substance (B) having a carboxyl group in the chemical structure and / or generating a carboxyl group in the chemical structure by a predetermined chemical structure change is provided. By using at least one of isoprene rubber, natural rubber, polyethylene, and polypropylene, a suitable thermoplastic resin composition that can effectively realize the above-described effects can be provided.

  Furthermore, according to the third invention of the present application, by further containing the acid-modified elastomer (C), impact resistance can be improved, and the above-mentioned effects can be more effectively exhibited.

  Furthermore, according to the fourth invention of the present application, since the acid-modified elastomer (C) is a modified olefin copolymer or a modified styrene copolymer, it is commercially available and relatively easily available. A variety of materials can be used.

  Still further, according to the fifth invention of the present application, the acid-modified elastomer (C) is modified with a modified ethylene butene copolymer (m-EBR), a modified ethylene propylene copolymer (m-EPR) or a modified styrene ethylene butadiene. By using a styrene terpolymer (m-SEBS), the above-mentioned effects can be reliably achieved using commercially available materials that are readily available.

  Furthermore, according to the sixth invention of the present application, by further including a granular filler (D) having an average particle diameter of 0.08 to 0.7 μm, heat resistance and impact resistance are balanced. Can be improved. If the diameter of the filler (D) is made extremely fine, aggregation between particles occurs, but by setting the average particle size to 0.08 to 0.7 μm, aggregation is suppressed, and heat resistance and impact resistance. Can be improved with an excellent balance.

  Still further, according to the seventh invention of the present application, by using calcium carbonate as the filler (D), a material that is highly commercially available and can be obtained at hand is used, and it is surely the same as in the sixth invention. An effect can be produced.

  Still further, according to the eighth invention of the present application, by using the polyamide resin (A) as polyamide 9T (PA9T), it is possible to reliably use the first to the above-described materials by using a material that is highly commercially available. The same effect as any one of 7th invention can be show | played.

  According to the ninth invention of the present application, a thermoplastic resin molded product having the same function and effect as any one of the first to eighth inventions can be obtained.

  Furthermore, according to the tenth aspect of the present invention, the same effects as those of the ninth aspect can be achieved, and in particular, a thermoplastic resin molded article suitable as a vehicle outer plate member can be obtained.

Hereinafter, embodiments of the present invention will be described in detail.
In the present embodiment, the polyamide resin (A) is used as a first component (base material component), and a solid substance (B) that generates a carboxyl group in the chemical structure due to a predetermined chemical structure change is added to the first component (base component). A three-component thermoplastic resin composition (Examples 1 to 4) to which an acid-modified elastomer (C) is added as a third component, and a filler (D) as a fourth component in addition to the thermoplastic resin composition. A four-component thermoplastic resin composition (Examples 5 to 8) to which was added was used.

The following materials were selected as the first component (A), the second component (B), the third component (C), and the fourth component (D), respectively.
First component (A): Polyamide resin
-Polyamide 9T (PA9T)
Second component (B): a solid substance that generates a carboxyl group in the chemical structure due to a change in the chemical structure
-Isoprene rubber or polyethylene / third component (C): acid-modified elastomer
-Modified ethylene butene copolymer (m-EBR)
-Fourth component (D): filler
-Calcium carbonate The calcium carbonate used as the fourth component (D) is granular and has an average particle size of 0.15 μm.

  Specifically, as shown in FIG. 1 to be described later, in Example 1 and Example 2, a thermoplastic resin composition containing PA9T, isoprene rubber and m-EBR was used, and in Example 3 and Example 4, PA9T was used. In Example 5 and Example 6, a thermoplastic resin composition containing PA9T, isoprene rubber, m-EBR, and calcium carbonate was used, and Example 7 was used. In Example 8, a thermoplastic resin composition containing PA9T, polyethylene, m-EBR, and calcium carbonate was used.

  Further, as comparative examples, a thermoplastic resin composition (Comparative Example 1 and Comparative Example 2) containing the first component (A) and the third component (C), the first component (A) and the third component (C). And ethylene acrylic acid copolymer, modified ethylene propylene diene copolymer (modified EPDM), acrylonitrile butadiene styrene (ABS), butadiene styrene methacrylate graft polymer, ethylene vinyl alcohol copolymer (EVOH), ethylene vinyl acetate copolymer A thermoplastic resin composition (Comparative Example 3 to Comparative Example 9) containing a hydrolyzate of polymer (EVA) or a terpene phenol resin was used.

  That is, Comparative Example 1 and Comparative Example 2 include PA9T and m-EBR, Comparative Example 3 includes PA9T, m-EBR, and ethylene acrylic acid copolymer, and Comparative Example 4 includes PA9T, m-EBR, and modification. Comparative Example 5 contains PA9T, m-EBR, and ABS, Comparative Example 6 contains PA9T, m-EBR, and a graft polymer of butadiene styrene methacrylate, and Comparative Example 7 contains PA9T and m- In Comparative Example 8, a thermoplastic resin composition containing PA9T, m-EBR, and EVA hydrolyzate was used, and in Comparative Example 9, a thermoplastic resin composition containing PA9T, m-EBR, and terpene phenol resin was used. . In addition, in FIG. 1, the composition ratio of the material used for each Example and the comparative example is shown.

  A resin molded article is molded using the thermoplastic resin compositions of the Examples and Comparative Examples thus obtained as materials, and the coating film adhesion is determined by a cross-cut test in accordance with JIS K5400 using the resin molded article as a test piece. Evaluated. In the present embodiment, a general acrylic melamine-based paint is used as a paint used for coating an outer plate member of a vehicle such as an automobile. After the acrylic melamine-based paint is applied to the test piece, the temperature is about 130 ° C. After drying and baking to form a coating film, cut through the coating film on the test piece to reach the ground surface of the test piece in a grid pattern, and apply adhesive tape on the grid pattern. After the film was completely adhered and pulled apart instantaneously, the adhesion state of the coating film after peeling off the adhesive tape was visually observed. For coating film adhesion, the evaluation score is graded every 2 points, 0 to 2 points are "1 grade", 3 to 4 points are "2 grade", 5 to 6 points are "3 grade", 7 to 8 points are “4th grade”, 9-10 points are “5th grade”, and the coating adhesion improves from “1st grade” to “5th grade”. The properties were considered good.

  FIG. 1 is a table showing composition ratios and test results of each component of a thermoplastic resin composition according to an embodiment of the present invention, and adhesion of a coating film (grade) to a resin molded product made of the thermoplastic resin composition. The test results are shown.

  As shown in FIG. 1, in Comparative Examples 1 to 7 and Comparative Example 9, the coating film adhesion was “first grade”, and in Comparative Example 8, the coating film adhesion was “second grade”. Example 1 and Example 2 containing PA9T as the first component (A), isoprene rubber as the second component (B), and m-EBR as the third component (C) (PA9T / m- EBR / isoprene rubber = 75/15/10 wt%), PA9T as the first component (A), polyethylene as the second component (B), and m-EBR as the third component (C) In Example 3 and Example 4 (PA9T / m-EBR / polyethylene = 75/15/10 wt%), the coating film adhesion was “quaternary”, indicating that the coating film adhesion was good. Thus, by using the thermoplastic resin composition containing the first component (A), the second component (B), and the third component (C) as a resin material, the adhesion of the coating can be improved. it can.

  PA9T as the first component (A), isoprene rubber as the second component (B), m-EBR as the third component (C), and calcium carbonate as the fourth component (D) Containing Example 5 (PA9T / m-EBR / isoprene rubber / calcium carbonate = 72.5 / 15/10 / 2.5 wt%) and Example 6 (PA9T / m-EBR / isoprene rubber / calcium carbonate = 70) / 15/10/5 wt%), PA9T as the first component (A), polyethylene as the second component (B), m-EBR as the third component (C), and a fourth component ( Example 7 (PA9T / m-EBR / polyethylene / calcium carbonate = 72.5 / 15/10 / 2.5 wt%) and Example 8 (PA9T / m-EBR /) containing calcium carbonate as D) Riechiren / coating adhesion even calcium carbonate = 70/15/10 / 5wt%) is "quaternary", it can be seen that the coating film adhesion is good. Thus, by using the thermoplastic resin composition containing the first component (A), the second component (B), the third component (C), and the fourth component (D) as a resin material, Coating film adhesion can be improved.

In the present embodiment, the surface of the resin molded article made of the thermoplastic resin composition of each example and comparative example is analyzed by total reflection infrared spectroscopy, and infrared analyzed by total reflection infrared spectroscopy. absorption spectrum, peak intensity of the amide groups in the vicinity of 1630 cm ^-1 peak intensity of the carboxyl groups near 1700～1715Cm ^-1 for (hereinafter referred to as P1) peak ratio (hereinafter referred to as P2) (hereinafter, P2 / P1 Measured).

FIG. 1 shows an infrared absorption spectrum measured at about 1630 cm ⁻¹ when the surface of a resin molded article made of the thermoplastic resin composition of each example and comparative example is analyzed by total reflection infrared spectroscopy. The peak ratio P2 / P1 of the peak intensity P2 of the carboxyl group in the vicinity of 1700 to 1715 cm ^{−1 with} respect to the peak intensity P1 of the amide group is shown.

  As shown in FIG. 1, the peak ratio P2 / P1 is 0.002 in Comparative Example 1, 0.003 in Comparative Example 2, 0.011 in Comparative Example 3, 0.002 in Comparative Example 4, and Comparative Example 5 Is 0.001, Comparative Example 6 is 0.003, Comparative Example 7 is 0.004, Comparative Example 8 is 0.007, and Comparative Example 9 is 0.001, whereas the first component (A) is In Example 1 and Example 2 containing PA9T, isoprene rubber as the second component (B), and m-EBR as the third component (C), 0.030 and 0.076, respectively, In Examples 3 and 4 containing PA9T as A), polyethylene as the second component (B), and m-EBR as the third component (C), they were 0.016 and 0.028, respectively. Compared with each comparative example, the peak ratio P2 / P1 is large. It can be seen that Kuna'.

  The peak ratio P2 / P1 is such that PA9T as the first component (A), isoprene rubber as the second component (B), m-EBR as the third component (C), and a fourth component In Example 5 and Example 6 containing calcium carbonate as (D), 0.024 and 0.028, PA9T as the first component (A), polyethylene as the second component (B), In Example 7 and Example 8 containing m-EBR as the third component (C) and calcium carbonate as the fourth component (D), they were 0.021 and 0.025, respectively. It can be seen that the peak ratio P2 / P1 is larger than that.

Figure 2, for the thermoplastic resin composition, the total reflection infrared peak ratio P2 / P1 and coating of 1700～1715Cm ^-1 vicinity of the peak intensity P2 to the peak intensity P1 of 1630cm around ^-1 as measured by spectrum method It is a graph which shows the relationship with film adhesion, the peak ratio (P2 / P1) is taken on the horizontal axis, the coating film adhesion (grade) is taken on the vertical axis, and the peak ratio P2 / P1 is about 0 to 0.03. Represents.

  As shown in FIG. 2, in the resin molded article made of the thermoplastic resin composition of each example and comparative example, in the case of the comparative example in which the peak ratio P2 / P1 is 0.011 or less, the coating film adhesion is “ In the case of the example in which the peak ratio P2 / P1 is 0.016 or more shown by the broken line in FIG. 2 while being “1st class” or “2nd class”, the coating film adhesion is “4th class”. It turns out that a favorable result is obtained about coating-film adhesiveness.

Thus, the surface of the thermoplastic resin composition containing PA9T as the first component (A) and isoprene rubber or polyethylene (B) as the second component (B) is subjected to total reflection infrared spectroscopy. when analyzed by law, the thermoplastic resin composition peak ratio P2 / P1 of the peak intensity P2 of the carboxyl groups near 1700～1715Cm ^-1 to the peak intensity P1 of the amide group near 1630 cm ^-1 is 0.016 or more By using a thing, the adhesiveness of a coating film can be improved.

  That is, according to the present embodiment, it is possible to realize a thermoplastic resin composition having improved coating film adhesion, and further, by molding with such a thermoplastic resin composition, coating film adhesion is improved. Molded product can be obtained. Furthermore, by using such a molded product, a vehicle outer plate member having improved coating film adhesion can be formed.

  In the case where a coating film is formed on the thermoplastic resin composition using, for example, an existing coating material used for a metal member or the like, specifically, an intermediate coating, a base coating, and a clear coating are applied to the thermoplastic resin composition. When three layers of coating are applied, the adhesion of the coating film can be ensured without applying the undercoat.

  Here, “causing a predetermined chemical structure change to generate a carboxyl group in the chemical structure” means to generate a carboxyl group in the chemical structure by a chemical structure change in the process from the material production to the final part, For example, heating during material production such as heating during kneading in an extrusion molding machine, heating during molding such as heating during molding in an injection molding machine, pre-treatment during pre-coating treatment such as chemical treatment during chemical conversion It means that the chemical structure of the thermoplastic resin composition changes to produce a carboxyl group in the chemical structure. This carboxyl group can be identified by total reflection infrared spectroscopy.

  In this embodiment, by using polyamide 9T (PA9T) as the polyamide resin of the first component (A), it is possible to reliably increase the adhesion of the coating film using a material that is highly commercially available and available at hand. Can do. In addition, although PA9T is used as the polyamide resin of the first component (A), other suitable polyamide resins can also be used.

Further, although isoprene rubber or polyethylene is used as the second component (B), natural rubber or polypropylene may be used, and at least one of isoprene rubber, natural rubber, polyethylene, and polypropylene can be used. Even in the thermoplastic resin composition containing the second component (B), when the surface of the thermoplastic resin composition is analyzed by total reflection infrared spectroscopy, the peak intensity of the amide group near 1630 cm ^−1. By using the thermoplastic resin composition in which the peak ratio of the peak intensity of carboxyl groups in the vicinity of 1700 to 1715 cm ⁻¹ is 0.016 or more, the adhesion of the coating film can be enhanced.

  Although m-EBR which is a modified olefin copolymer is used as the acid-modified elastomer of the third component (C), a modified olefin copolymer such as a modified ethylene propylene copolymer (m-EPR) is used. Alternatively, a modified styrene copolymer such as a modified styrene ethylene butadiene styrene terpolymer (m-SEBS) may be used.

  Thus, impact resistance can be improved by containing the acid-modified elastomer (C) in the thermoplastic resin composition according to the present embodiment. Further, by using the acid-modified elastomer (C) as a modified olefin copolymer or a modified styrene copolymer, various materials that are commercially available and are relatively readily available can be used. Become. Further, the acid-modified elastomer (C) is modified with a modified ethylene butene copolymer (m-EBR), a modified ethylene propylene copolymer (m-EPR) or a modified styrene ethylene butadiene styrene terpolymer (m-SEBS). Thus, the above-described effects can be reliably achieved using a commercially available material that is readily available.

  As the filler of the fourth component (D), calcium carbonate can be suitably used, and a granular material having an average particle diameter of 0.08 to 0.7 μm is preferably used. Thus, heat resistance and impact resistance can be improved with good balance by including the particulate filler in the thermoplastic resin composition according to the present embodiment. If the filler diameter is made extremely fine, aggregation between particles will occur, but by setting the average particle size to 0.08 to 0.7 μm, aggregation is suppressed and heat resistance and impact resistance are excellent. It can be increased with a good balance. Moreover, the said effect can be reliably show | played using the material which has high commercial property and is available at hand by using the said filler as the calcium carbonate.

  In this embodiment, as the second component (B), a solid substance that generates a carboxyl group in the chemical structure by a predetermined chemical structure change is used. However, a solid substance having a carboxyl group in the chemical structure may be used. Alternatively, a solid substance that generates a carboxyl group in a chemical structure by a predetermined chemical structure change and a solid substance that has a carboxyl group in the chemical structure may be used. Further, as the second component (B), it is also possible to use a liquid substance having a carboxyl group in the chemical structure and / or a liquid substance that generates a carboxyl group in the chemical structure by a predetermined chemical structure change.

As described above, the second component (B) has a carboxyl group in the chemical structure and / or is a thermoplastic using a solid substance and / or a liquid substance that generates a carboxyl group in the chemical structure by a predetermined chemical structure change. Also in the resin composition, when the surface of the thermoplastic resin composition was analyzed by total reflection infrared spectroscopy, the peak of the carboxyl group near 1700 to 1715 cm ^{−1 with} respect to the peak intensity of the amide group near 1630 cm ^−1. By using the thermoplastic resin composition having a peak strength ratio of 0.016 or more, the adhesion of the coating film can be enhanced.

  Examples of the solid material of the second component (B) include natural rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber, butyl rubber, chloroprene rubber, nitrile rubber and the like, such as polyethylene wax, oxidized polyethylene wax, paraffin wax, and fisher. Waxes such as Tropsch wax can be used. In addition, as the liquid material of the second component (B), for example, oil such as paraffin oil can be used.

  In addition, the molded product made of the thermoplastic resin composition according to the present embodiment includes fender, door, bonnet, back door, trunk lid, bumper, spoiler, roof, side step, instrument panel, door trim, glove box, center panel, door mirror. It can be used as automotive parts such as wheel caps, front grills, filler lids, etc. Other than automotive parts, it can be used for electrical appliance casings, building material decorative boards, sundries, toys, cosmetic containers, etc. it can.

  As described above, the present invention is not limited to the illustrated embodiments, and it goes without saying that various improvements and design changes can be made without departing from the gist of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the thermoplastic resin composition and thermoplastic resin molded product which can improve coating-film adhesiveness can be obtained, for example, it can utilize effectively for outer plate members, such as a fender panel of a motor vehicle. .

It is a table | surface which shows the composition ratio and test result of each component of the thermoplastic resin composition which concerns on embodiment of this invention. It is a graph which shows the relationship between peak ratio (P2 / P1) and coating-film adhesiveness about the said thermoplastic resin composition.

Claims (10)

It contains a polyamide resin (A) and a solid substance and / or a liquid substance (B) having a carboxyl group in the chemical structure and / or generating a carboxyl group in the chemical structure by a predetermined chemical structure change. When the surface of the thermoplastic resin composition is analyzed by total reflection infrared spectroscopy using a total reflection infrared spectroscopic method, a carboxyl of about 1700 to 1715 cm ^{−1 with} respect to the peak intensity of the amide group near 1630 cm ⁻¹ A thermoplastic resin composition, wherein the peak ratio of the peak intensity of the group is 0.016 or more.   The solid substance and / or liquid substance (B) having a carboxyl group in the chemical structure and / or generating a carboxyl group in the chemical structure by a predetermined chemical structure change is made of isoprene rubber, natural rubber, polyethylene, or polypropylene. It is at least 1 type, The thermoplastic resin composition of Claim 1 characterized by the above-mentioned.   The thermoplastic resin composition according to claim 1 or 2, further comprising an acid-modified elastomer (C).   The thermoplastic resin composition according to claim 3, wherein the acid-modified elastomer (C) is a modified olefin copolymer or a modified styrene copolymer.   The thermoplastic resin composition according to claim 4, wherein the acid-modified elastomer (C) is a modified ethylene butene copolymer, a modified ethylene propylene copolymer, or a modified styrene ethylene butadiene styrene terpolymer. object.   The filler (D) is further contained, the filler (D) is granular, and an average particle diameter thereof is 0.08 to 0.7 μm. 6. Thermoplastic resin composition.   The thermoplastic resin composition according to claim 6, wherein the filler (D) is calcium carbonate.   The thermoplastic resin composition according to any one of claims 1 to 7, wherein the polyamide resin (A) is polyamide 9T.   A thermoplastic resin molded product, which is molded by the thermoplastic resin composition according to any one of claims 1 to 8.   A vehicle outer plate member formed of the thermoplastic resin molded article according to claim 9.

Images