JP5820040B2 - Contact parts made of thermoplastic resin composition with reduced squeaking noise - Google Patents

Description

  The present invention relates to a contact part made of a thermoplastic resin composition with reduced squeaking noise, and more specifically, made of a thermoplastic resin composition with greatly reduced squeaking sound generated by contacting and rubbing with other members. It relates to contact parts.

ABS resin is excellent in mechanical strength and moldability, and is used in a wide range of fields such as automobiles, home appliances, and OA, but its heat resistance and impact resistance are insufficient and its use is limited. Polycarbonate (PC) resin, on the other hand, has excellent heat resistance and impact resistance, and is used in a wide range of fields such as automobiles, home appliances, and precision machinery. However, its moldability and impact resistance at low temperatures are insufficient. Is limited.
As a method for compensating for these drawbacks, it is known to blend an ABS resin and a polycarbonate resin. By using this method, the heat resistance and impact resistance of the ABS resin are improved, and the moldability and impact resistance at low temperatures of the polycarbonate resin are also improved. As a result, the moldability, impact resistance, and mechanical strength are improved. In addition, a resin blend with excellent heat resistance has been obtained, and it has become possible to use it in a wide range of fields such as automobile interior parts that require the safety of passengers in the event of a collision.

  However, when a molded product made of PC / ABS resin blended with ABS resin and polycarbonate resin is used as an automobile interior part, the PC / ABS resin interior part is caused to vibrate between the parts or the part due to vibration during driving of the automobile. And other members such as ABS resin, acrylic resin, polyvinyl chloride, chloroprene rubber, polyurethane, natural rubber, polyester or polyethylene lining sheet, foam, etc., come into contact with each other and rub, generating squeaking noise Sometimes. Also, when used for desk drawers and doors, PC / ABS parts come into contact with metal parts such as SUS, aluminum, brass parts, and other members such as ABS resin, and itching sounds (friction noise) ) May occur. These squeaking noises are a major cause of impairing the comfort and quietness in automobiles, offices, and residential rooms, and there is a strong demand for reducing squeaking noises.

Since the PC / ABS resin and PC resin are non-crystalline resins, they have a higher coefficient of friction than crystalline resins such as polyethylene, polypropylene, and polyacetal, and are used for switch parts and office desks for instrument panels in automobiles. When used on a part that comes into contact with another member by fitting or the like, such as a slide part of the above, a stick-slip phenomenon as shown in FIG. Will occur. The stick-slip phenomenon occurs when two objects rub against each other. When the object M connected by a spring is placed on a driving table that moves at a driving speed V as shown in the model of FIG. The object M first moves to the right as shown in FIG. 2 (b) together with the table moving at the driving speed V by the action of the static friction force. When the force to be restored by the spring becomes equal to the static friction force, the object M starts to slide in the direction opposite to the driving speed V. At this time, the object M receives a dynamic frictional force, so that the sliding stops at the time of FIG. 2C when the dynamic force of the spring becomes equal to the dynamic frictional force, that is, adheres to the drive base. It moves in the same direction as the driving speed V (FIG. 2 (d)). This is called a stick-slip phenomenon, and it is said that if the difference Δμ between the static friction coefficient μs and the μl at the lower end of the sawtooth waveform is large as shown in FIG. The dynamic friction coefficient is an intermediate value between μs and μl.
These squeaking noises are a major cause of impairing the comfort and quietness in automobiles, offices, and residential rooms, and there is a strong demand for reducing squeaking noises.

  On the other hand, it is known that the stick-slip phenomenon appears prominently when the friction speed dependency of the friction coefficient obtained by Ammonton-Coulomb law takes a negative value (see Non-Patent Document 1). Therefore, by making the dependency of the friction coefficient on the friction speed close to zero or a positive value not less than zero, it is possible to suppress the occurrence of the stick-slip phenomenon and reduce the generation of the squeaking noise.

  Therefore, in order to prevent the squeaking noise of these contact parts, a method of applying Teflon (registered trademark) coating on the surface of the member, a method of mounting a Teflon (registered trademark) tape, a method of mounting a non-woven fabric, a method of applying silicone oil, etc. However, there are problems that the steps such as mounting and coating are very complicated and time-consuming, and that the effect is not sustained when placed at a high temperature for a long time.

  In addition, as a method for modifying the material of contact parts used for automobile interior parts and indoor mechanism parts, a method of blending silicone oil with ABS resin, a method of blending epoxy-containing olefin copolymer with ABS resin, etc. Proposed. For example, a technique of blending an organosilicon compound into a resin made of polycarbonate resin and ABS resin (see Patent Document 1), and a technique of blending a flame retardant, a flame retardant aid and silicone oil into ABS resin (see Patent Document 2) ), A technique of blending silicone oil into ABS resin, MBS resin and HIPS (high impact polystyrene) resin (see Patent Document 3), and a technique of blending alkanesulfonate surfactant into ABS resin (Patent Document 4). In addition, a modified polyorganosiloxane containing at least one reactive group selected from an epoxy group, a carboxyl group and an acid anhydride group is added to the ABS resin to increase water repellency and increase the water in the bathroom and toilet. A technique (see Patent Document 5) used for a rotating part is disclosed.

  However, the stagnation noise reduction effect by these methods is not sufficient, and even if it shows a certain level of stagnation noise prevention effect immediately after molding, the effect persists poorly, especially when placed at high temperatures for a long time Has a problem that its effect is greatly reduced. Furthermore, in recent years, in vehicle interior applications, in order to ensure the safety of passengers in the event of a collision, not only the impact resistance but also the brittle fracture, which may cause the broken pieces of the molded product to fly, is required to be ductile fracture. It came to be able to.

Japanese Patent Publication No. 63-56267 Japanese Patent No. 2798396 Japanese Patent No. 2688619 Japanese Patent No. 2659467 JP 10-316833 A

Surface Science Vol.24, No.6, PP 328-333, 2003

  In view of such circumstances, the present invention significantly reduces the occurrence of squeaking noise that occurs when the members rub against each other, and maintains the squeaking noise reduction effect even when placed under high temperature for a long time, and Is a contact made of a thermoplastic resin composition with excellent moldability, impact resistance, mechanical strength and heat resistance that can be used in a wide range of fields such as automotive interior parts that require passenger safety in the event of a collision. The purpose is to provide parts.

As a result of diligent research to solve the above-mentioned problems, the inventors of the present invention have made a rubber-modified vinyl resin obtained by graft-polymerizing a vinyl monomer to a specific ethylene / α-olefin rubber polymer to a polycarbonate resin. By mixing a specific amount, the generation of squeaking noise that occurs when the members rub against each other is remarkably reduced, and even when placed at high temperatures for a long time, the squeaking noise reduction effect is maintained without deteriorating, and Can be used in a wide range of fields such as automobile interior parts that require passenger safety in the event of a collision. For contact made of a thermoplastic resin composition with excellent moldability, impact resistance, mechanical strength and heat resistance. It was found that parts can be obtained. Further, it has also been found that by adding a specific amount of specific silicone oil and / or polyolefin wax to the thermoplastic resin composition, the effect of reducing squeaking noise is further improved.
The present invention has been completed based on such findings.

According to the present invention, the following contact parts made of a thermoplastic resin composition are provided. That is,
1. Thermoplastic containing 20 to 65 parts by mass of rubber-reinforced vinyl resin [A] and 35 to 80 parts by mass of polycarbonate resin [B] (however, 100 parts by mass in total of [A] and [B]) A resin composition [X],
The rubber-reinforced vinyl resin [A] is obtained by polymerizing a vinyl monomer [c1] in the presence of an ethylene / α-olefin rubbery polymer [a1] having a Tm (melting point) of 0 ° C. or higher. And a rubber-reinforced vinyl resin [A2] obtained by polymerizing a vinyl monomer [c2] in the presence of a diene rubber polymer [a2] And
The total amount of the ethylene / α-olefin-based rubbery polymer [a1] and the diene-based rubbery polymer [a2] is 5 to 30% by mass based on 100% by mass of the thermoplastic resin composition [X]. It is a molded product made of a certain thermoplastic resin composition [X], which is used in a place where the thermoplastic resin composition [X] or another molded product made of another thermoplastic resin contacts and rubs. Contact parts made of a thermoplastic resin composition with reduced resistance.
2. 1. The rubber-reinforced vinyl resin [A] further contains a (co) polymer [C] of a vinyl monomer [c3]. Contact parts made of the thermoplastic resin composition according to 1.
3. The ethylene / α-olefin rubbery polymer [a1] is composed of 60 to 95% by mass of ethylene and 40 to 5% by mass of α-olefin (however, the total of ethylene and α-olefin is 100% by mass). 1. Or 2. Contact parts made of the thermoplastic resin composition according to 1.
4). 1. The mass ratio [a1]: [a2] of the ethylene / α-olefin rubber polymer [a1] and the diene rubber polymer [a2] is 90-15: 10-85. To 3. A contact part made of the thermoplastic resin composition according to any one of the above.
5. 100 parts by mass of the thermoplastic resin composition [X] and further 0.1 to 8 parts by mass of silicone oil [D] and / or 0.1 to 8 parts by mass of polyolefin wax [E] Above 1. To 4. A contact part made of the thermoplastic resin composition according to any one of the above.
6). 4. The silicone oil [D] is at least one selected from the group consisting of methylphenyl silicone oil, alkyl / aralkyl-modified silicone oil, and amino-modified silicone oil. Contact parts made of the thermoplastic resin composition according to 1.
7). 1. Used for automotive interior parts, switch parts, office equipment parts, desk lock parts, residential interior parts, or indoor door opening / closing damper parts. To 6. A contact part made of the thermoplastic resin composition according to any one of the above.

  According to the present invention, when a specific amount of a rubber reinforced vinyl resin obtained by graft polymerization of a vinyl monomer and a polycarbonate resin is blended with a specific ethylene / α-olefin rubber polymer, the members rub against each other. Automobile interior parts that significantly reduce the squeaking noise and maintain the squeaking noise reduction effect even when left at high temperatures for a long time, and also require passenger safety during a collision. It is possible to obtain a contact part made of a thermoplastic resin composition that is excellent in moldability, impact resistance, mechanical strength, and heat resistance and can be used in a wide range of fields.

FIG. 1 is an explanatory diagram of the stick-slip phenomenon. FIGS. 2A, 2B, 2C, and 2D are stick-slip model diagrams. FIG. 3 is a schematic diagram showing a method for examining the occurrence of a squeaking noise.

Hereinafter, the present invention will be described in detail.
The thermoplastic resin contact part in the present invention is composed of 20 to 65 parts by mass of a rubber-reinforced vinyl resin [A] and 35 to 80 parts by mass of a polycarbonate resin [B] (however, the total of [A] and [B]. And 100 parts by mass) of a thermoplastic resin composition [X],
The rubber-reinforced vinyl resin [A] is obtained by polymerizing a vinyl monomer [c1] in the presence of an ethylene / α-olefin rubbery polymer [a1] having a Tm (melting point) of 0 ° C. or higher. Rubber reinforced vinyl resin [A1],
From the contact part made of a thermoplastic resin composition, wherein the content of the ethylene / α-olefin-based rubbery polymer [a1] is 5 to 30% by mass with respect to 100% by mass of the thermoplastic resin composition [X]. It is characterized by becoming.

  In the present specification, “(co) polymerization” means homopolymerization and copolymerization, “(meth) acryl” means acryl and / or methacryl, and “(meth) acrylate” Means acrylate and / or methacrylate.

1. Rubber reinforced vinyl resin [A] (hereinafter also referred to as “component [A]”):
The component [A] used in the present invention is obtained by polymerizing a vinyl monomer [c1] in the presence of an ethylene / α-olefin rubber polymer [a1] having a Tm (melting point) of 0 ° C. or higher. Rubber reinforced vinyl resin obtained by polymerizing vinyl monomer [c2] in the presence of rubber reinforced vinyl resin [A1] alone and, if necessary, diene rubber polymer [a2] It is a rubber-reinforced vinyl resin comprising a mixture with [A2] and / or a mixture of vinyl monomer [c3] with (co) polymer [C]. The (co) polymer [C] is obtained by polymerizing the vinyl monomer [c3] in the absence of a rubbery polymer.

1-1. Ethylene / α-olefin rubbery polymer [a1] (hereinafter also referred to as “component [a1]”):
The ethylene / α-olefin rubbery polymer [a1] used in the present invention is not particularly limited except that the Tm (melting point) is 0 ° C. or higher. For example, an ethylene / α-olefin copolymer, An ethylene / α-olefin / non-conjugated diene copolymer may be mentioned. Here, Tm is a value obtained by measuring endothermic changes at a constant temperature increase rate of 20 ° C. per minute using a DSC (differential scanning calorimeter), and reading the peak temperature of the obtained endothermic pattern. , JIS K7121-1987. The Tm is preferably 0 to 120 ° C., more preferably 10 to 100 ° C., and particularly preferably 20 to 80 ° C. If the Tm is less than 0 ° C., the effect of reducing the squeaking noise is inferior. In the DSC measurement, those that do not clearly show the endothermic change peak are those that have substantially no crystallinity in the rubbery polymer and are judged to have no Tm, and the above Tm is 0 ° C. or higher. It is not included in the rubbery polymer. Therefore, those without Tm are also inferior in the effect of reducing the squeaking noise.
The rubbery polymer having a melting point (Tm) means that the rubbery polymer has a crystalline part. If a crystalline part is present in the rubber polymer, it is considered that the generation of the squeaking noise is suppressed in order to suppress the occurrence of the slip stick phenomenon as described above.
Further, the glass transition temperature (Tg) of the rubbery polymer is preferably −20 ° C. or lower, more preferably −30 ° C. or lower, and particularly preferably −40 ° C. or lower. If the glass transition temperature exceeds −20 ° C., impact resistance may be insufficient. In addition, the said glass transition temperature can be calculated | required based on JISK7121-1987 using DSC (differential scanning calorimeter) similarly to the measurement of Tm (melting | fusing point).

As an alpha olefin which comprises the said component [a1], a C3-C20 alpha olefin is mentioned, for example, Specifically, a propylene, 1-butene, 1-pentene, 1-hexene, 4- Examples include methyl-1-pentene, 1-heptene, 1-octene, 1-decene, 1-dodecene, 1-hexadecene, 1-eicosene and the like. These α-olefins can be used alone or in admixture of two or more. The carbon number of the α-olefin is preferably 3 to 20, more preferably 3 to 12, and still more preferably 3 to 8. When the number of carbon atoms exceeds 20, the copolymerizability is lowered and the surface appearance of the molded product may be insufficient. The mass ratio of ethylene: α-olefin is usually 5 to 95:95 to 5, preferably 50 to 95:50 to 5, more preferably 60 to 95:40 to 5.
When the mass ratio of α-olefin exceeds 95, the resulting rubber-reinforced vinyl resin is not preferable because the impact resistance is insufficient. If it is less than 5, the rubber elasticity of the rubber polymer [a1] is not sufficient, and the impact resistance of the resin composition is not sufficient.

  Non-conjugated dienes include alkenyl norbornenes, cyclic dienes and aliphatic dienes, with 5-ethylidene-2-norbornene and dicyclopentadiene being preferred. These non-conjugated dienes can be used alone or in admixture of two or more. The ratio of the non-conjugated diene to the total amount of the rubbery polymer is usually 0 to 20% by mass, preferably 0 to 10% by mass, and more preferably 0 to 5% by mass. When the proportion of the non-conjugated diene exceeds 20% by mass, the melting point (Tm) of the rubber-like polymer [a1] may be lowered, or the melting point may disappear, and the effect of reducing squeaking noise may be insufficient.

  The Mooney viscosity (ML1 + 4, 100 ° C .; conforming to JIS K6300) of the component [a1] is usually 5 to 80, preferably 10 to 65, more preferably 10 to 45. When the Mooney viscosity exceeds 80, the fluidity of the resulting rubber-reinforced vinyl resin may be insufficient. When the Mooney viscosity is less than 5, the resulting molded article may have insufficient impact resistance. There is.

  The ethylene / α-olefin rubbery polymer [a1] is preferably an ethylene / α-olefin copolymer that does not contain a non-conjugated diene component from the viewpoint of reducing squeaking noise. Polymers, ethylene / 1-butene copolymers, and ethylene / 1-octene copolymers are more preferable, and ethylene / propylene copolymers are particularly preferable.

  The ethylene / α-olefin rubbery polymer [a1] is a polymer obtained by hydrogenating a block (co) polymer obtained by using a conjugated diene compound such as butadiene or isoprene (of a conjugated diene moiety). The hydrogenation rate of the double bond is preferably 90% or more from the viewpoint of weather resistance. The polymer may be a crosslinked polymer or an uncrosslinked polymer.

1-2. Diene rubbery polymer [a2] (hereinafter also referred to as “component [a2]”):
The diene rubbery polymer [a2] may be a homopolymer such as polybutadiene or polyisoprene; a styrene / butadiene copolymer, a styrene / butadiene / styrene copolymer, an acrylonitrile / styrene / butadiene copolymer, or an acrylonitrile / butadiene. Butadiene copolymers such as copolymers; styrene / isoprene copolymers, styrene / isoprene / styrene copolymers, isoprene copolymers such as acrylonitrile / styrene / isoprene copolymers, and the like. These may be random copolymers or block copolymers. Moreover, these can be used individually or in combination of 2 or more types. The diene rubbery polymer [a2] may be a crosslinked polymer or an uncrosslinked polymer.

1-3. Vinyl monomers [c1] to [c3]:
The vinyl monomers [c1], [c2] and [c3] are not particularly limited as long as they are all polymerizable compounds having an unsaturated bond.
The vinyl monomers [c1], [c2] and [c3] usually contain an aromatic vinyl compound and a vinyl cyanide compound. In addition, if necessary, other copolymerizable vinyl monomers such as (meth) acrylic acid ester and maleimide compound, carboxyl group, acid anhydride group, hydroxyl group, amino group, amide group, epoxy group A functional group-containing vinyl monomer having at least one functional group such as an oxazoline group may be used in combination. The vinyl monomers [c1] and [c2] used for forming the rubber-reinforced vinyl resins [A1] and [A2] may be the same as or different from each other.
The vinyl monomer [c3] used for forming the (co) polymer [C] may be the same as or different from the vinyl monomers [c1] and / or [c2]. May be.

  The aromatic vinyl compound is not particularly limited as long as it is a compound having at least one vinyl bond and at least one aromatic ring. Examples thereof include styrene, α-methyl styrene, o-methyl styrene, p-methyl styrene, vinyl toluene, β-methyl styrene, ethyl styrene, p-tert-butyl styrene, vinyl xylene, vinyl naphthalene, monochlorostyrene, dichloromethane. Examples thereof include styrene, monobromostyrene, dibromostyrene, and fluorostyrene. These can be used alone or in combination of two or more. Of these, styrene and α-methylstyrene are preferred.

  Examples of the vinyl cyanide compound include acrylonitrile and methacrylonitrile. These can be used alone or in combination of two or more. Of these, acrylonitrile is preferred.

  Examples of the (meth) acrylic acid ester include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, amyl acrylate, hexyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, acrylic acid Acrylic esters such as phenyl and benzyl acrylate; methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, amyl methacrylate, hexyl methacrylate, octyl methacrylate, 2-ethylhexyl methacrylate, dodecyl methacrylate, methacrylic acid And methacrylic acid esters such as octadecyl acid, cyclohexyl methacrylate, phenyl methacrylate, and benzyl methacrylate. These can be used alone or in combination of two or more. Of these, methyl methacrylate is preferred.

Examples of the maleimide compound include maleimide, N-methylmaleimide, N-butylmaleimide, N-cyclohexylmaleimide, and N-phenylmaleimide. These can be used alone or in combination of two or more. Of these, N-cyclohexylmaleimide and N-phenylmaleimide are preferable.
As a method for introducing a monomer unit comprising this maleimide compound into a polymer, there is a method in which maleic anhydride is copolymerized in advance and then imidized.

  Among the functional group-containing vinyl monomers, examples of the unsaturated compound having a carboxyl group include acrylic acid, methacrylic acid, ethacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, and cinnamic acid. . These can be used alone or in combination of two or more.

Examples of the unsaturated compound having an acid anhydride group include maleic anhydride, itaconic anhydride, and citraconic anhydride. These can be used alone or in combination of two or more.
Examples of unsaturated compounds having a hydroxyl group include hydroxystyrene, 3-hydroxy-1-propene, 4-hydroxy-1-butene, cis-4-hydroxy-2-butene, trans-4-hydroxy-2-butene, 3 -Hydroxy-2-methyl-1-propene, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, N- (4-hydroxyphenyl) maleimide and the like. These can be used alone or in combination of two or more.

As unsaturated compounds having an amino group, aminoethyl acrylate, propylaminoethyl acrylate, dimethylaminomethyl acrylate, diethylaminomethyl acrylate, 2-dimethylaminoethyl acrylate, aminoethyl methacrylate, propylaminoethyl methacrylate , Dimethylaminomethyl methacrylate, diethylaminomethyl methacrylate, 2-dimethylaminoethyl methacrylate, phenylaminoethyl methacrylate, p-aminostyrene, N-vinyldiethylamine, N-acetylvinylamine, acrylicamine, methacrylamine, N- Examples include methylacrylamine. These can be used alone or in combination of two or more.
Examples of the unsaturated compound having an amide group include acrylamide, N-methylacrylamide, methacrylamide, N-methylmethacrylamide and the like. These can be used alone or in combination of two or more.

  Examples of the unsaturated compound having an epoxy group include glycidyl acrylate, glycidyl methacrylate, and allyl glycidyl ether. These can be used alone or in combination of two or more.

  Examples of the unsaturated compound having an oxazoline group include vinyl oxazoline. These can be used alone or in combination of two or more.

  The vinyl monomers [c1], [c2] and [c3] are selected according to their purpose, application, etc., and their types and amounts used. The total amount of the aromatic vinyl compound and the vinyl cyanide compound is as follows: The total amount of vinyl monomers is 100 to 100% by mass, usually 30 to 100% by mass, preferably 50 to 100% by mass, and more preferably 70 to 100% by mass. The content of the other copolymerizable vinyl monomer is usually 0 to 70% by mass, preferably 0 to 50% by mass, more preferably 0 to 30% with respect to 100% by mass of the whole vinyl monomer. % By mass. The content of the functional group-containing vinyl monomer is usually 0 to 40% by mass, preferably 0 to 30% by mass, more preferably 0 to 20% by mass with respect to 100% by mass of the total amount of the vinyl monomer. %. The use ratio of the aromatic vinyl compound and the vinyl cyanide compound (aromatic vinyl compound / vinyl cyanide compound) is usually 40 to 85% by mass / 15 to 60% by mass when the total of these is 100% by mass. Preferably, it is 45-85 mass% / 15-55 mass%.

1-4. Method for producing the rubber-reinforced vinyl resin [A]:
The rubber-reinforced vinyl resin [A] is a polymer component containing an ethylene / α-olefin rubber polymer [a1] and, if necessary, a diene rubber polymer [a2]. The containing form is not particularly limited.
In the rubber-reinforced vinyl resin [A], a graft copolymer in which a (co) polymer of a vinyl monomer is grafted to a rubber polymer, and a rubber polymer are not grafted. (Co) polymers of vinyl monomers are included. However, this graft copolymer may contain a rubbery polymer to which a (co) polymer of a vinyl monomer is not grafted.
Examples of the content when the ethylene / α-olefin rubbery polymer [a1] and the diene rubbery polymer [a2] are used are exemplified below.
(1) The case where both the ethylene / α-olefin rubber polymer [a1] and the diene rubber polymer [a2] are contained as a graft copolymer.
(2) The case where either one of the ethylene / α-olefin rubber polymer [a1] and the diene rubber polymer [a2] is contained as a graft copolymer.
(3) A case where both the ethylene / α-olefin rubber polymer [a1] and the diene rubber polymer [a2] are contained as an ungrafted rubber polymer.
Of these, (1) is particularly preferred.

Examples of the rubber-reinforced vinyl resin [A] of the above aspect (1) are as follows.
[I] A rubber-reinforced vinyl resin [A1] obtained by polymerizing a vinyl monomer [c1] in the presence of the ethylene / α-olefin rubber polymer [a1], or the rubber A mixture comprising a reinforced vinyl resin [A1] and a rubber reinforced vinyl resin [A2] obtained by polymerizing a vinyl monomer [c2] in the presence of the diene rubber polymer [a2]. .
[Ii] A mixture comprising the above mixture [i] and a (co) polymer [C] of the vinyl monomer [c3] (hereinafter also referred to as “(co) polymer [C]”).
[Iii] Obtained by polymerizing the vinyl monomer [c1] or [c2] in the presence of the ethylene / α-olefin rubber polymer [a1] and the diene rubber polymer [a2]. Rubber-reinforced vinyl resin [A3].
[Iv] A mixture comprising the rubber-reinforced vinyl resin [A3] and the (co) polymer [C].
Among these, [i] and [ii] are preferable from the viewpoint of productivity, and [ii] is particularly preferable.
The rubber-reinforced vinyl resin [A] may be a combination of two or more of the above [i], [ii], [iii] and [iv].

Next, a method for producing the rubber-reinforced vinyl resins [A1], [A2] and [A3] will be described.
Examples of the polymerization method include known polymerization methods such as emulsion polymerization, solution polymerization, suspension polymerization, and bulk polymerization. In any case, in the presence of the rubbery polymer, the vinyl monomers may be charged all at once, or may be reacted by dividing or continuously adding them. Further, the rubbery polymer may be added or reacted in the whole or in part during the polymerization with the vinyl monomer.
In addition, the usage-amount of a rubber-like polymer is 5-80 mass% normally when the sum total of a rubber-like polymer and a vinyl-type monomer is 100 mass%, Preferably it is 10-70 mass%.

The production method of the rubber-reinforced vinyl resin [A1] is preferably solution polymerization and bulk polymerization, more preferably solution polymerization. The production method of the rubber-reinforced vinyl resin [A2] is emulsion polymerization or suspension polymerization. The method for producing the rubber-reinforced vinyl resin [A3] is preferably emulsion polymerization, solution polymerization, suspension polymerization, and bulk polymerization, and may be a combination of these methods.
When the above rubber-reinforced vinyl resins [A1], [A2] and [A3] are produced by emulsion polymerization, a polymerization initiator, a chain transfer agent, an emulsifier, water and the like are usually used. In addition, when the said rubbery polymer is not a latex form but a solid form, it can be used as a latex form by re-emulsification.

As the polymerization initiator, a combination of an organic peroxide such as cumene hydroperoxide, diisopropylbenzene hydroperoxide, paramentane hydroperoxide and a reducing agent represented by a sugar-containing pyrophosphate formulation, a sulfoxylate formulation, etc. Redox polymerization initiators by: persulfates such as potassium persulfate; peroxides such as benzoyl peroxide (BPO), lauroyl peroxide, tert-butyl peroxylaurate, tert-butyl peroxymonocarbonate; Examples thereof include azo polymerization initiators such as 2′-azobis (isobutyronitrile). These can be used alone or in combination of two or more. The amount of the polymerization initiator used is usually 0.05 to 5% by mass, preferably 0.1 to 1% by mass, based on the total amount of the vinyl monomer [c1] or [c2].
The polymerization initiator is usually added all at once or continuously to the reaction system.

  Examples of chain transfer agents include mercaptans such as octyl mercaptan, n-dodecyl mercaptan, tert-dodecyl mercaptan, n-hexyl mercaptan, n-hexadecyl mercaptan, n-tetradecyl mercaptan, tert-tetradecyl mercaptan; terpinolenes, α -Methylstyrene dimer, tetraethylthiuram sulfide, acrolein, methacrolein, allyl alcohol, 2-ethylhexylthioglycol and the like. These can be used alone or in combination of two or more. The amount of the chain transfer agent used is usually 0.05 to 2% by mass with respect to the total amount of the vinyl monomer [c1] or [c2].

  Examples of the emulsifier include anionic surfactants and nonionic surfactants. Examples of the anionic surfactant include sulfates of higher alcohols; alkylbenzene sulfonates such as sodium dodecylbenzene sulfonate; aliphatic sulfonates such as sodium lauryl sulfate; rosinates and phosphates. Examples of nonionic surfactants include polyethylene glycol alkyl ester compounds and alkyl ether compounds. These can be used alone or in combination of two or more. The usage-amount of the said emulsifier is 0.3-5 mass% normally with respect to the whole quantity of the said vinylic monomer [c1] or [c2].

  Emulsion polymerization can be carried out under known conditions according to the type and amount of the vinyl monomer [c1] or [c2] used, the polymerization initiator and the like. The latex obtained by the above emulsion polymerization is usually purified by coagulating with a coagulant to form a polymer component in powder form, and then washing with water and drying. Examples of the coagulant include inorganic salts such as calcium chloride, magnesium sulfate, magnesium chloride, and sodium chloride; inorganic acids such as sulfuric acid and hydrochloric acid; organic acids such as acetic acid, lactic acid, and citric acid. These can be used alone or in combination of two or more. Further, depending on the required performance, washing may be carried out after adding an alkali component or an acid component after solidification to neutralize it.

When the above rubber-reinforced vinyl resins [A1], [A2] and [A3] are produced by solution polymerization, usually a solvent, a polymerization initiator, a chain transfer agent and the like are used.
Examples of the solvent include inert polymerization solvents used in known radical polymerization, for example, aromatic hydrocarbons such as ethylbenzene and toluene; ketones such as methyl ethyl ketone and acetone; halogenated hydrocarbons such as dichloromethylene and carbon tetrachloride. Acetonitrile, dimethylformamide, N-methylpyrrolidone and the like can be used. These can be used alone or in combination of two or more.

Examples of the polymerization initiator include organic peroxides such as ketone peroxide, dialkyl peroxide, diacyl peroxide, peroxy ester, and hydroperoxide. These can be used alone or in combination of two or more.
Examples of chain transfer agents include mercaptans, terpinolenes, α-methylstyrene dimers, and the like. These can be used alone or in combination of two or more.

  Solution polymerization can be carried out under known conditions depending on the type of vinyl monomer [c1] or [c2] used, polymerization initiator or the like. The polymerization temperature is usually in the range of 80 to 140 ° C. In addition, in the case of solution polymerization, it can also manufacture without using a polymerization initiator.

  Also in the case of bulk polymerization and suspension polymerization, known methods can be applied. The polymerization initiator, chain transfer agent and the like used in these methods are not particularly limited, but the same compounds as those exemplified in the solution polymerization can be used.

1-5. Physical properties of rubber-reinforced vinyl resin [A]:
The graft ratios of the rubber-reinforced vinyl resins [A1], [A2] and [A3] obtained as described above are all usually 10 to 150% by mass, preferably 20 to 120% by mass, particularly preferably. Is 20-80 mass%. If the graft ratio is less than 10% by mass, the interfacial strength between the graft copolymer and the (co) polymer of the vinyl monomer [c1] or [c2] is inferior, and the impact resistance may not be sufficient. . On the other hand, when the content exceeds 150% by mass, the layer of the vinyl monomer [c1] or [c2] (co) polymer on the surface of the rubbery polymer becomes thick, and the rubber polymer is grafted inside. Since the layer made of the (co) polymer is developed, the rubber elasticity is lowered, and as a result, the impact resistance may be lowered.

  The graft ratio can be determined by the following formula.

  Graft ratio (mass%) = {(S−T) / T} × 100

  In the above formula, S represents 1 gram of rubber-reinforced vinyl resin in 20 ml of acetone (acetonitrile when the rubbery polymer is an acrylic rubber) and shakes with a shaker for 2 hours at 25 ° C. After that, the mass (g) of insoluble matter obtained by centrifuging for 60 minutes with a centrifuge (rotation speed: 23,000 rpm) under a temperature condition of 5 ° C. to separate the insoluble matter and the soluble matter. Yes, T is the mass (g) of the rubbery polymer contained in 1 gram of rubber-reinforced vinyl resin. The mass of the rubbery polymer can be obtained by a method of calculating from a polymerization prescription and a polymerization conversion rate, a method of obtaining from an infrared absorption spectrum (IR), and the like.

  In addition, the intrinsic viscosity [η] (measured in methyl ethyl ketone at 30 ° C.) of the acetone-soluble components of the rubber-reinforced vinyl resins [A1], [A2] and [A3] is usually 0.1 to 1. 0.5 dl / g, preferably 0.2 to 1.0 dl / g. When the intrinsic viscosity [η] is within the above range, the physical property balance between molding processability and impact resistance is excellent.

The intrinsic viscosity [η] was measured by the following method. First, acetone-soluble components of the rubber-reinforced vinyl resins [A1], [A2], and [A3] were dissolved in methyl ethyl ketone, and five different concentrations were prepared. The intrinsic viscosity [η] was determined from the results of measuring the reduced viscosity of each concentration at 30 ° C. using an Ubbelohde viscosity tube. The unit is dl / g.
The intrinsic viscosity can be adjusted by appropriately selecting the type and amount of chain transfer agent used during production, the type and amount of polymerization initiator, the polymerization temperature, and the like.

  As described above, the rubber-reinforced vinyl resin [A] according to the present invention is a rubber-reinforced vinyl resin [A1] prepared separately or a mixture of [A1] and [A2]. It was obtained by polymerizing the vinyl monomer [c1] or [c2] in the presence of the ethylene / α-olefin rubber polymer [a1] and the diene rubber polymer [a2]. A rubber-reinforced vinyl resin [A3] may be used. Therefore, when using a plurality of rubber-reinforced vinyl resins such as the former, a mixture of resins obtained in each manufacturing process may be used, but as another method, for example, each resin is obtained by emulsion polymerization. Can be obtained by mixing latexes and then coagulating them.

2. Polycarbonate resin [B] (hereinafter also referred to as “component [B]”):
The polycarbonate resin [B] used in the present invention is not particularly limited, but is preferably an aromatic polycarbonate resin. Examples of the aromatic polycarbonate resin include those obtained by melting a transesterification (transesterification reaction) of an aromatic dihydroxy compound and a carbonic acid diester, those obtained by an interfacial polycondensation method using phosgene, pyridine and phosgene, Those obtained by the pyridine method using the above reaction product can be used.

  The aromatic dihydroxy compound may be any compound having two hydroxyl groups in the molecule, such as dihydroxybenzene such as hydroquinone and resorcinol, 4,4′-biphenol, 2,2-bis (4-hydroxyphenyl) propane ( Hereinafter, referred to as “bisphenol A”), 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 2,2 -Bis (3-tert-butyl-4-hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, bis (4-hydroxyphenyl) methane, 1,1-bis ( p-hydroxyphenyl) ethane, 2,2-bis (p-hydroxyphenyl) butane, 2,2-bis ( -Hydroxyphenyl) pentane, 1,1-bis (p-hydroxyphenyl) cyclohexane, 1,1-bis (p-hydroxyphenyl) -4-isopropylcyclohexane, 1,1-bis (p-hydroxyphenyl) -3, 3,5-trimethylcyclohexane, 1,1-bis (p-hydroxyphenyl) -1-phenylethane, 9,9-bis (p-hydroxyphenyl) fluorene, 9,9-bis (p-hydroxy-3-methyl) Phenyl) fluorene, 4,4 ′-(p-phenylenediisopropylidene) diphenol, 4,4 ′-(m-phenylenediisopropylidene) diphenol, bis (p-hydroxyphenyl) oxide, bis (p-hydroxy) Phenyl) ketone, bis (p-hydroxyphenyl) ether, bis (p-hydroxy) Phenyl) ester, bis (p-hydroxyphenyl) sulfide, bis (p-hydroxy-3-methylphenyl) sulfide, bis (p-hydroxyphenyl) sulfone, bis (3,5-dibromo-4-hydroxyphenyl) sulfone, Examples thereof include bis (p-hydroxyphenyl) sulfoxide. These can be used alone or in combination of two or more.

  Of the aromatic dihydroxy compounds, compounds having a hydrocarbon group between two benzene rings are preferred. In this compound, the hydrocarbon group may be a halogen-substituted hydrocarbon group. Further, the benzene ring may be one in which a hydrogen atom contained in the benzene ring is substituted with a halogen atom. Therefore, the above compounds include bisphenol A, 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 2,2 -Bis (3-tert-butyl-4-hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, bis (4-hydroxyphenyl) methane, 1,1-bis ( p-hydroxyphenyl) ethane, 2,2-bis (p-hydroxyphenyl) butane and the like. Of these, bisphenol A is particularly preferable.

  Examples of the carbonic acid diester used for obtaining the aromatic polycarbonate by transesterification include dimethyl carbonate, diethyl carbonate, di-tert-butyl carbonate, diphenyl carbonate, and ditolyl carbonate. These can be used alone or in combination of two or more.

  The viscosity average molecular weight of the polycarbonate resin (A) is preferably 15,000 to 40,000, more preferably 17,000 to 30,000, and particularly preferably 18,000 to 28,000. The higher the viscosity average molecular weight, the higher the impact resistance, while the fluidity is insufficient and the moldability tends to be inferior. In addition, as long as the viscosity average molecular weight as a whole falls in the above range, two or more kinds of polycarbonate resins having different viscosity average molecular weights may be mixed and used.

3. (Co) polymer [C] (hereinafter also referred to as “component [C]”):
3-1. Production method of (co) polymer [C]:
The (co) polymer [C] polymerizes the vinyl monomer [c3] by a known method such as solution polymerization, bulk polymerization, emulsion polymerization or suspension polymerization in the absence of a rubbery polymer. Can be manufactured. The polymerization may be thermal polymerization without using a polymerization initiator, or may be catalytic polymerization using a polymerization initiator.

3-2. Physical properties of (co) polymer [C]:
The intrinsic viscosity [η] (measured in methyl ethyl ketone at 30 ° C.) of the polymer [C] is usually 0.1 to 1.5 dl / g, preferably 0.2 to 1.0 dl / g. When the intrinsic viscosity [η] is within the above range, the physical property balance between molding processability and impact resistance is excellent.

The intrinsic viscosity [η] was measured by the following method. First, the above (co) polymer [C] was dissolved in methyl ethyl ketone to prepare 5 samples having different concentrations. The intrinsic viscosity [η] was determined from the results of measuring the reduced viscosity of each concentration at 30 ° C. using an Ubbelohde viscosity tube. The unit is dl / g.
The intrinsic viscosity can be adjusted by appropriately selecting the type and amount of chain transfer agent used during production, the type and amount of polymerization initiator, the polymerization temperature, and the like.

4). Silicone oil [D] (hereinafter also referred to as “component [D]”):
As the silicone oil as the component [D] used in the present invention, a known one can be used as long as it has a polyorganosiloxane structure. The silicone oil [D] may be an unmodified silicone oil such as dimethyl silicone oil, methylphenyl silicone oil, methyl hydrogen silicone oil, or a part of side chain in the polyorganosiloxane structure and / or polyorgano It may be a modified silicone oil in which various organic groups are introduced into one terminal part of the siloxane structure or both terminal parts of the polyorganosiloxane structure. Examples of the modified silicone oil include alkyl-modified silicone oil, alkyl-aralkyl-modified silicone oil, polyether-modified silicone oil, fluorine-modified silicone oil, higher alkoxy-modified silicone oil, higher fatty acid-modified silicone oil, methylstyryl-modified silicone oil, and methylchlorine. Phenyl silicone oil, methyl hydrogenated silicone oil, amino modified silicone oil, epoxy modified silicone oil, carboxyl modified silicone oil, acrylic modified silicone oil, methacryl modified silicone oil, mercapto modified silicone oil, phenol modified silicone oil, carbinol modified silicone Oil etc. can be used. Of these, methylphenyl silicone oil, alkyl / aralkyl-modified silicone oil, and amino-modified silicone oil are preferred. These can be used alone or in combination of two or more.
When the silicone oil [D] used in the present invention is methylphenyl silicone oil, alkyl aralkyl-modified silicone oil, or amino-modified silicone oil, the generation of squeaking noise is remarkably reduced and the product is placed at a high temperature for a long time. Even in this case, the effect of reducing the squeaking noise is maintained without deteriorating, and further, a contact part made of a thermoplastic resin composition having excellent impact resistance and molded appearance is obtained.
In addition, when the silicone oil [D] used in the present invention is methylphenyl silicone oil, the generation of the squeaking noise is remarkably reduced, and the squeaking noise reduction effect is maintained when left at a high temperature for a long time. It is even better.

  The methylphenyl silicone oil used in the present invention is a non-reactive straight silicone oil in which part of the side chain of the polysiloxane is a phenyl group.

  The alkyl / aralkyl-modified silicone oil used in the present invention is a non-reactive modified silicone oil in which an alkyl group and an aralkyl group are introduced into a part of the side chain of the silicone oil.

  The amino-modified silicone oil used in the present invention is one in which an amino group is introduced into a part of the side chain of polysiloxane, and the amino modification may be either monoamine modification or diamine modification.

  The kinematic viscosity at 25 ° C. of the silicone oil [D] used in the present invention is usually 10 to 100,000 cSt, preferably 10 to 50,000 cSt, more preferably 15 to 50,000 cSt, and particularly preferably 20 ~ 30,000 cSt. When the kinematic viscosity at 25 ° C. of the silicone oil [D] is less than 10 cSt, the effect of reducing the squeaking noise tends to be insufficient. On the other hand, when the kinematic viscosity exceeds 100,000 cSt, the thermoplastic resin composition [X ], The dispersibility of the silicone oil [D] is deteriorated, the impact resistance and the stagnation noise reduction effect are not stably exhibited, and the extrusion processability during melt-kneading tends to decrease.

  The kinematic viscosity of the silicone oil was measured by an Ubbelohde viscometer according to ASTM D445-46T (JIS 8803 is acceptable).

5. Polyolefin wax [E] (hereinafter also referred to as “component [E]”):
The polyolefin-based wax as the component [E] used in the present invention is a relatively low molecular weight, whose number average molecular weight is usually in the range of 100 to 10,000 among olefin homopolymers and copolymers. Those are preferred. Specific examples include polyethylene wax, polypropylene wax, olefin copolymer wax (for example, ethylene copolymer wax), and these partial oxides or mixtures thereof are also included. The structure of the polyolefin wax may be a linear structure or a branched structure. These can be used alone or in combination of two or more.
For the olefin copolymer, for example, two or more olefins such as ethylene, propylene, 1-butene, 1-hexene, 1-decene, 4-methyl-1-butene, 4-methyl-1-pentene are used. Copolymer, monomers copolymerizable with these olefins, such as unsaturated carboxylic acids and acid anhydrides thereof ((meth) acrylic acid, maleic anhydride, etc.), (meth) acrylic acid esters [ And a copolymer with a polymerizable monomer such as (meth) acrylic acid methyl ester, (meth) acrylic acid alkyl ester such as ethyl (meth) acrylate], and the like. These copolymers include random copolymers, block copolymers, and graft copolymers.

The number average molecular weight of the polyolefin wax is preferably 1,000 to 6,000, more preferably 1,200 to 5,500. When the number average molecular weight is in this range, the releasability is particularly excellent.
Moreover, the preferable viscosity (140 degreeC) of the said polyolefin-type wax is 100-10,000 cps, More preferably, it is 100-5,000 cps. When the viscosity is in this range, the release property is particularly excellent.

6). Thermoplastic resin composition [X]:
In the thermoplastic resin composition [X] of the present invention, the component [A], the component [B], and optionally the components [C], [D] and [E] are mixed at a predetermined blending ratio. It can be obtained by melt-kneading.

  The amount of the component [A] and the component [B] used in the present invention is 20 to 65 parts by mass and 35 to 80 parts by mass, with the total of the component [A] and the component [B] being 100 parts by mass. Parts, preferably 25 to 65 parts by weight, and 35 to 75 parts by weight, more preferably 35 to 65 parts by weight, and 35 to 65 parts by weight, particularly preferably 45 to 65 parts by weight and 35 to 35 parts by weight. 55 parts by mass. When the usage-amount of said component [A] is less than 20 mass parts and the usage-amount of said component [B] exceeds 80 mass parts, the reduction effect of a squeaking sound and a moldability will be inferior. On the other hand, when the amount of the component [A] used exceeds 65 parts by mass and the amount of the component [B] used is less than 35 parts by mass, the fracture mode becomes brittle fracture and the impact strength is also inferior.

  The content of the ethylene / α-olefin rubber polymer [a1] in the component [A] is 5 to 30% by mass, preferably 100% by mass of the thermoplastic resin composition [X], preferably It is 5-25 mass%, Most preferably, it is 5-20 mass%. If this total amount is less than 5% by mass, the effect of reducing squeaking noise and moldability are inferior.

  The mass ratio [a1]: [a2] of the ethylene / α-olefin rubber polymer [a1] and the diene rubber polymer [a2] in the component [A] is usually 90-15: 10. 85, preferably 80 to 20:20 to 80, more preferably 75 to 25:25 to 75, and particularly preferably 75 to 50:25 to 50. By setting the mass ratio of each rubbery polymer within this range, the squeaking noise reduction effect, impact resistance and heat resistance are sufficient.

  Furthermore, the said component [A] can mix | blend the (co) polymer [C] of vinyl-type monomer [c3] if desired. The amount of the component [C] is preferably 5 to 70% by mass, more preferably 10 to 60% by mass, when the total amount of the component [A] is 100% by mass.

  The blending amount of the silicone oil [D] with respect to 100 parts by mass of the thermoplastic resin composition [X] is usually 0.1 to 8 parts by mass, preferably 0.2 to 6 parts by mass, more preferably 0.5 to 0.5 parts by mass. 5 parts by mass, particularly preferably 2.5 to 3.5 parts by mass. If the amount of the component [D] is less than 0.1 part by mass, the effect of reducing the squeaking noise may not be sufficiently obtained. On the other hand, when the compounding amount of the component [D] exceeds 8 parts by mass, the appearance and impact resistance of the molded product may be insufficient, and melt mixing may be difficult.

  The blending amount of the polyethylene wax [E] with respect to 100 parts by mass of the thermoplastic resin composition [X] is usually 0.1 to 8 parts by mass, preferably 0.2 to 6 parts by mass, more preferably 0.5 to 0.5 parts by mass. 5 parts by mass, particularly preferably 2.0 to 5.0 parts by mass. If the amount of the component [E] is less than 0.1 parts by mass, the effect of reducing the squeaking noise may not be sufficiently obtained. On the other hand, when the blending amount of the component [E] exceeds 8 parts by mass, the appearance and impact resistance of the molded product may be insufficient, and melt mixing may be difficult.

  As described above, the thermoplastic resin composition [X] according to the present invention can be used as necessary with a filler, a nucleating agent, a lubricant, a heat stabilizer, an antioxidant, an ultraviolet absorber, a flame retardant, an antiaging agent, a plasticizer. Various additives such as an agent, an antibacterial agent, and a coloring agent can be contained within a range that does not impair the object of the present invention.

  Furthermore, the thermoplastic resin composition [X] of the present invention may be prepared by using other resins such as polyethylene, polypropylene, polybutylene terephthalate, polyethylene terephthalate, polyphenylene sulfide, and polyamide as necessary. It can be contained in a range.

  In the thermoplastic resin composition [X] of the present invention, each component is mixed in a predetermined blending ratio with a tumbler mixer, a Henschel mixer, etc., and then a single screw extruder, twin screw extruder, Banbury mixer, kneader, roll, feeder. It can be manufactured by melt-kneading under suitable conditions using a mixer such as a ruder. A preferred kneader is a twin screw extruder. Furthermore, when each component is kneaded, each component may be kneaded in a lump or may be kneaded in multiple stages. In addition, after knead | mixing with a Banbury mixer, a kneader, etc., it can also pelletize with an extruder. Moreover, it is more preferable to supply the fibrous thing among fillers from the middle of an extruder with a side feeder in order to prevent the cutting | disconnection in kneading | mixing. The melt kneading temperature is usually 200 to 300 ° C, preferably 220 to 280 ° C.

7). Contact parts:
The contact component of the present invention is obtained by molding the thermoplastic resin composition. There is no limitation on the method for producing the contact component of the present invention from the thermoplastic resin composition, and injection molding, injection compression molding, gas assist molding, press molding, calendar molding, T-die extrusion molding, profile extrusion molding, It can be produced by a known method such as film forming.

There is no particular limitation on the other members to which the contact component of the present invention comes into contact, for example, a thermoplastic resin, a thermosetting resin, rubber, an organic material, an inorganic material, including the thermoplastic resin composition [X] of the present invention, A metal material etc. are mentioned.
Examples of the thermoplastic resin include polyvinyl chloride, polyethylene, polypropylene, AS resin, ABS resin, AES resin, ASA resin, PMMA, polystyrene, high impact polystyrene, EVA, polyamide (PA), polyethylene terephthalate, and polybutylene terephthalate. , Polycarbonate (PC), polylactic acid, PC / ABS, PC / AES, PA / ABS, PA / AES and the like. These can be used alone or in combination of two or more.
Examples of the thermosetting resin include phenol resin, epoxy resin, urea resin, melamine resin, and unsaturated polyester resin. These can be used alone or in combination of two or more.
Examples of the rubber include chloroprene rubber, polybutadiene rubber, ethylene / propylene rubber, various synthetic rubbers such as SEBS, SBS, and SIS, and natural rubber. These can be used alone or in combination of two or more.
Examples of the organic material include insulation board, MDF (medium fiber board), hard board, particle board, lumbar core, LVL (single board laminate), OSB (orientation board), PSL (pararam), WB (wafer). Board), hard fiberboard, soft fiberboard, lumbar core plywood, board core plywood, special core-plywood, veneer core-plywood, laminated sheet / board of paper impregnated with tap resin, small pieces of crushed (old) paper, etc. -Boards obtained by mixing a linear body with an adhesive and heating and compressing, various kinds of wood, and the like. These can be used alone or in combination of two or more.
Examples of the inorganic material include calcium silicate board, flexible board, homocement board, gypsum board, sizing gypsum board, reinforced gypsum board, gypsum lath board, decorative gypsum board, composite gypsum board, various ceramics, and glass. These can be used alone or in combination of two or more.
Furthermore, iron, aluminum, copper, various alloys, etc. are mentioned as a metal material. These can be used alone or in combination of two or more.

The contact component of the present invention can be suitably used for automobile interior parts, office equipment, house interior parts and the like having portions that contact, join, and fit with other members.
The automotive interior part of the present invention can greatly reduce the squeaking noise that occurs when it comes into contact with and rubs against other members. Furthermore, it is excellent in safety at the time of collision by performing ductile fracture. Such automobile interior parts include door trim, door lining, pillar garnish, console, door pocket, ventilator, duct, air conditioner, meter visor, instrument panel upper garnish, instrument panel garnish, A / T indicator, on / off switches (slide part, Slide plate), grill front defroster, grill side defroster, lid cluster, cover intro, masks (mask switch, mask radio, etc.), glove box, pockets (pocket deck, pocket card, etc.), steering wheel horn pad, switch Examples include parts and exterior parts for car navigation. Among them, it can be particularly suitably used as a ventilator for automobiles, plate blades for air conditioners for automobiles, valve shutters, louvers, switch parts, car navigation exterior parts, and the like.

  The parts for office equipment according to the present invention can greatly reduce the squeaking noise generated by contacting and rubbing with other members. Furthermore, it is excellent in safety, such as a collision, by performing ductile fracture. Such contact parts for office equipment can be suitably used for desk lock parts, desk drawers, and the like.

  The house interior part of the present invention can greatly reduce the squeaking noise generated by contacting and rubbing with other members. Furthermore, it is excellent in safety, such as a collision, by performing ductile fracture. Such house interior parts can be particularly suitably used as shelf doors, chair dampers, table folding leg movable parts, door opening / closing dampers, sliding door rails, curtain rails, and the like.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated more concretely, this invention is not restrict | limited at all to the following Example, unless the summary is exceeded. In the examples, parts and% are based on mass unless otherwise specified.

(1) Evaluation method:
The measuring methods of various evaluation items in the following examples and comparative examples are shown below.

(1-1) Itching sound evaluation I (practical evaluation):
Using an injection molding machine “J-100E” (model name) manufactured by Nippon Steel Co., Ltd., an ISO dumbbell test piece made of the thermoplastic resin composition shown in Table 1 was injection-molded. It was left in a gear oven at ℃ for 200 hours. Next, five ISO dumbbell test pieces made of the thermoplastic resin composition described in Table 1 above, and other parts in contact with each other consist of PC / ABS “CK43” (trade name) manufactured by Technopolymer Co., Ltd. Similarly, five ISO dumbbell test pieces that were left in a gear oven at 80 ° C. for 200 hours were alternately stacked, and the both ends were twisted by hand to evaluate the state of occurrence of squeaking noise. Evaluation was performed 5 times, and determination was performed based on the following evaluation criteria.
Evaluation of squeaking noise reduction effect:
○: In all five evaluations, the occurrence of itching was slight.
(Triangle | delta): The case where generation | occurrence | production of a squeaking sound was remarkable was contained in five evaluations.
X: In all five evaluations, the generation of itching sound was significant.
A similar evaluation was also performed in which the standing time in the gear oven was 400 hours.

(1-2) Itching sound evaluation II (friction speed dependence of friction coefficient):
Thermoplastics listed in Table 1 using an electric injection molding machine “ELECT NEX30” (model name) manufactured by Nissei Plastic Industrial Co., Ltd. under conditions of a molding temperature of 240 ° C., a mold temperature of 50 ° C., and an injection speed of 30 mm / s. Cylindrical test pieces with an inner diameter of 20 mm, an outer diameter of 24.8 mm, and a height of 15 mm made of PC / ABS “CK43” (trade name) manufactured by Techno Polymer Co., Ltd., which are other parts that come into contact with the resin composition, are injected. After molding, both test pieces were left in a gear oven at 80 ° C. for 400 hours. Next, using an abrasion friction tester “EFM-III-EN” (trade name) manufactured by Orientec Co., Ltd., a test piece made of CK43 was set as a contact partner on the rotating side, and the fixing side shown in Table 1 was used. A test piece made of a thermoplastic resin composition was set, and the friction strength was measured under the conditions of a load of 3 kg, a rotation speed (friction speed) of 50, 100, and 150 mm / sec, and the slope of the friction coefficient with respect to the friction speed was determined.

(1-3) Deflection temperature under load Using the thermoplastic resin composition shown in Table 1, a test piece having a length of 80 mm, a width of 10 mm, and a thickness of 4 mm was prepared with an injection molding machine J100E (manufactured by Nippon Steel Works). did. The molding conditions were a molding temperature of 250 ° C. and a mold temperature of 60 ° C. Evaluation was based on ISO75, and measured by Flat-wise method and a load of 1.82 MPa.
The evaluation result shows that the higher the deflection temperature under load, the better the heat resistance.

(1-4) Melt Mass Flow Rate Using pellets produced with a twin screw extruder (Nippon Steel Works TEX44) using the thermoplastic resin composition described in Table 1, ISO 1133 (temperature 240 ° C., load 98 N) The melt mass flow rate (MFR) was measured accordingly. The unit is g / 10 minutes.

(1-5) Drop weight impact strength:
Using an electric injection molding machine “Erject NEX30” (model name) manufactured by Nissei Plastic Industrial Co., Ltd., an 80 mm × 55 mm × 2.4 mm flat plate type test piece made of the thermoplastic resin composition shown in Table 1 Injection molded. The test piece was provided with a side gate of 4 mm × 1 mm at the center of one side of 55 mm, the resin temperature during molding was 240 ° C., and the mold temperature was 50 ° C. Next, using the Shimadzu hydro-shot / high-speed puncture impact tester “HITS-P10” (model name) manufactured by Shimadzu Corporation, the test piece was punched under the following conditions to measure the fracture energy (J).
Measurement temperature: 23 ° C
Punching speed: 6.7mm / s
Punching test jig striker tip: φ12.7mm
Die diameter of specimen holder: 43 mm

(1-6) Destruction mode:
When the crack around the punched part of the evaluation plate after the drop weight impact strength test of the evaluation method (1-5) is observed, if the crack length from the end of the punched part is within 5 mm, ductile fracture is more than 5 mm Was evaluated as brittle fracture.
If the contact part causes a brittle fracture at the time of a collision, there is a possibility that the safety of the occupant cannot be sufficiently ensured, for example, debris is scattered around.

(2-1) Component [A]
A1-1: AES-1
A 20-liter stainless steel autoclave equipped with a ribbon-type stirrer blade, an auxiliary agent continuous addition device, a thermometer, etc., was used as an ethylene / α-olefin rubber polymer [a1] as an ethylene / propylene copolymer (ethylene / propylene copolymer). Propylene = 78/22 (%), Mooney viscosity (ML1 + 4, 100 ° C) 20, melting point (Tm) 40 ° C, glass transition temperature (Tg) -50 ° C 22 parts, styrene 55 parts, acrylonitrile 23 parts, tert -0.5 parts of dodecyl mercaptan and 110 parts of toluene were charged, the internal temperature was raised to 75 ° C, and the contents of the autoclave were stirred for 1 hour to obtain a homogeneous solution. Thereafter, 0.45 part of tert-butylperoxyisopropyl monocarbonate was added, the internal temperature was further raised, and after reaching 100 ° C., the polymerization reaction was carried out at a stirring speed of 100 rpm while maintaining this temperature. went. From 4 hours after the start of the polymerization reaction, the internal temperature was raised to 120 ° C., and the reaction was further continued for 2 hours while maintaining this temperature to complete the polymerization reaction. Thereafter, the internal temperature was cooled to 100 ° C., 0.2 part of octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenol) -propionate was added, and then the reaction mixture was extracted from the autoclave, Unreacted substances and the solvent were distilled off by distillation, and the volatile matter was substantially degassed using a 40 mmφ vented extruder (cylinder temperature 220 ° C., vacuum degree 760 mmHg), and pelletized. The resulting ethylene / α-olefin rubbery polymer reinforced vinyl resin had a graft rate of 70% and an intrinsic viscosity [η] of acetone-soluble content of 0.47 dl / g.

A2: ABS-1
In a polymerizer with a stirrer, 280 parts of water and diene rubber polymer [a2], 60 parts of polybutadiene latex having a weight average particle diameter of 0.26 μm and a gel fraction of 90% (in terms of solid content), sodium formaldehyde sulfoxylate 0.3 parts, 0.0025 parts of ferrous sulfate and 0.01 parts of disodium ethylenediaminetetraacetate were added, and after deoxidation, the mixture was heated to 60 ° C. with stirring in a nitrogen stream, then 10 parts of acrylonitrile, 30 parts of styrene Part, tert-dodecyl mercaptan 0.2 part, cumene hydroperoxide 0.3 part monomer mixture was continuously added dropwise at 60 ° C. over 5 hours. After completion of the dropwise addition, the polymerization temperature was set to 65 ° C. and stirring was continued for 1 hour, and then the polymerization was terminated to obtain a latex of a graft copolymer. The polymerization conversion rate was 98%. Thereafter, 0.2 part of 2,2′-methylene-bis (4-ethylene-6-tert-butylphenol) is added to the obtained latex, and calcium chloride is added to coagulate, washing, filtering and drying steps. After that, a powdery resin composition was obtained. The graft ratio of the obtained resin composition was 40%, and the intrinsic viscosity [η] of the acetone-soluble component was 0.38 dl / g.

A3: AES-2
Ethylene / propylene / dicyclopentadiene copolymer as an ethylene / α-olefin rubbery polymer [a1] in a 20 liter stainless steel autoclave equipped with a ribbon stirrer blade, auxiliary additive device, thermometer, etc. (Ethylene / propylene / dicyclopentadiene = 63/32/5 (%), Mooney viscosity (ML1 + 4, 100 ° C.) 33, no melting point (Tm), glass transition temperature (Tg) of −52 ° C.) 30 parts, styrene 45 Part, acrylonitrile 25 parts, tert-dodecyl mercaptan 0.5 part, toluene 140 parts, the internal temperature was raised to 75 ° C., and the autoclave contents were stirred for 1 hour to obtain a homogeneous solution. Thereafter, 0.45 part of tert-butylperoxyisopropyl monocarbonate was added, the internal temperature was further raised, and after reaching 100 ° C., the polymerization reaction was carried out at a stirring speed of 100 rpm while maintaining this temperature. went. From 4 hours after the start of the polymerization reaction, the internal temperature was raised to 120 ° C., and the reaction was further continued for 2 hours while maintaining this temperature to complete the polymerization reaction. Thereafter, the internal temperature was cooled to 100 ° C., 0.2 part of octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenol) -propionate was added, and then the reaction mixture was extracted from the autoclave, Unreacted substances and the solvent were distilled off by distillation, and the volatile matter was substantially degassed using a 40 mmφ vented extruder (cylinder temperature 220 ° C., vacuum degree 760 mmHg), and pelletized. The obtained ethylene / α-olefin rubbery polymer reinforced vinyl resin had a graft ratio of 60% and an intrinsic viscosity [η] of acetone-soluble component of 0.45 dl / g.

A1-2: AES-3
An ethylene / α-olefin rubbery polymer [a1] was added to a polyolefin elastomer “ENGAGE8100” (trade name, ethylene / 1-octene = 76/24 (%), Mooney viscosity (ML1 + 4, ML) manufactured by DuPont Dow Elastomer Co., Ltd. 121 ° C.) 23, a melting point (Tm) of 60 ° C., and a glass transition temperature (Tg) of −56 ° C.) [a1] A rubber-reinforced vinyl resin was obtained in the same manner as AES-1. The resulting rubber-reinforced vinyl resin had a graft rate of 60% and an intrinsic viscosity [η] of acetone-soluble content of 0.41 dl / g.

(2-2) Component [B] (Polycarbonate resin):
B-1: Novalex 7022PJ (manufactured by Mitsubishi Engineering Plastics), viscosity average molecular weight (Mv) was 22,000.

B-2: Novalex 7022PJ-LH1 (manufactured by Mitsubishi Engineering Plastics), and the viscosity average molecular weight (Mv) was 18,500.

(2-3) Component [C] AS:
In a polymerization vessel equipped with a stirrer, 250 parts of water and 1.0 part of sodium palmitate were charged, and after deoxygenation, the mixture was heated to 70 ° C. with stirring in a nitrogen stream. Further, 0.4 parts of sodium formaldehyde sulfoxylate, 0.0025 part of ferrous sulfate and 0.01 part of disodium ethylenediaminetetraacetate were added, and then 70 parts of α-methylstyrene, 25 parts of acrylonitrile, 5 parts of styrene, tert- A monomer mixture composed of 0.5 parts of dodecyl mercaptan and 0.2 parts of cumene hydroperoxide was continuously added dropwise at a polymerization temperature of 70 ° C. over 7 hours. After completion of the dropping, the polymerization temperature was set to 75 ° C., and stirring was continued for 1 hour to complete the polymerization, thereby obtaining a copolymer latex. The polymerization conversion rate was 99%. Thereafter, the obtained latex was coagulated by adding calcium chloride, and a powdery copolymer was obtained through washing, filtration and drying steps. The intrinsic viscosity [η] of the acetone-soluble component of the obtained copolymer was 0.40 dl / g.

(2-4) Component [D] (silicone oil):
D-1: Methyl phenyl silicone oil; KF54 (manufactured by Shin-Etsu Silicone Co., Ltd.), kinematic viscosity at 25 ° C. was 400 cSt.

D-2: Amino-modified silicone oil; TSF4700 (made by Momentive Performance Materials Japan), kinematic viscosity at 25 ° C. was 50 cSt.

D-3: Alkyl / aralkyl-modified silicone oil; XF42-334 (manufactured by Momentive Performance Materials Japan), kinematic viscosity at 25 ° C. was 1300 cSt.

(2-5) Component [E] (polyolefin wax):
E-1: Sunwax 171-P (manufactured by Sanyo Chemical Industries, Ltd.) and polyethylene wax had a number average molecular weight (Mn) of 1500.

E-2: Sun wax 161-P (manufactured by Sanyo Chemical Industries, Ltd.) and polyethylene wax, the number average molecular weight (Mn) was 5000.

(2-6) Component [F] (Additive):
F-1: Ethylene bisstearic acid amide; Kao wax EB-P (manufactured by Kao Corporation)

F-2: 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) -s-triazine-2,4,6- (1H, 3H, 5H) trione; Adekastab AO- 20 (made by ADEKA Corporation)

F-3: Bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite; ADK STAB PEP-24G (manufactured by ADEKA Corporation)

Examples 1-19 and Comparative Examples 1-6
After mixing the thermoplastic composition comprising the above components [A] to [F] with a Henschel mixer at the blending ratio shown in Table 1, a twin-screw extruder (manufactured by Nippon Steel Works, TEX44α, barrel set temperature 250 ° C.) And kneaded and pelletized. Each test piece for evaluation was molded as described above with the obtained pellets. And it evaluated by the said method using the obtained test piece. The evaluation results are shown in Table 1.

As can be seen from Table 1, the thermoplastic resin compositions of the present invention represented by Examples 1 to 19 are reduced in the squeaking noise intended by the present invention, and further have heat resistance, impact resistance, and resin fluidity. In addition, it is possible to provide a molded product having a balanced destruction form.
On the other hand, Comparative Example 1 is an example that does not contain the specific ethylene / α-olefin rubbery polymer [a1] of the present invention, and is inferior in the effect of reducing squeaking noise. Comparative Example 2 is an example in which the blending amount of the polycarbonate resin [B] is insufficient, and is inferior in safety because of brittle fracture. Comparative Example 3 is an example in which the blending amount of the polycarbonate resin [B] is excessive, the effect of reducing the squeaking noise is remarkably lowered, and the fluidity of the molten resin is insufficient, so that the moldability is also poor. The comparative example 4 is an example which does not contain polycarbonate resin [B], and since heat resistance is low and it becomes a brittle fracture, it is inferior to safety | security. Comparative Example 5 is an example in which the compounding amount of the rubber-reinforced vinyl resin [A] is excessive and the compounding amount of the polycarbonate resin [B] is too small, because the heat resistance and impact resistance are low and brittle fracture occurs. Inferior to safety. Comparative Example 6 is an example in which AES using a base rubber other than the specific ethylene / α-olefin rubbery polymer [a1] of the present invention is used, but the effect of reducing the squeaking noise (practical evaluation: 400 hours) Inferior.

Example 20
As shown in FIG. 3, the contact part A is made of the thermoplastic resin composition of Example 2, a T-shaped part having a bottom part 1 and a rising part 2, and the other contact part B is a technopolymer. PC / ABS “CK43” (trade name) made of PC, which is made of a bottom part 3 and two rising parts 4, 4 for tightly holding the rising part 2, is manufactured. After being left in a gear oven at ℃ for 200 hours, the rising part 2 of the T-shaped part is assembled so as to be sandwiched between the two rising parts 4 and 4 of the sandwiched part, and is slid as indicated by the arrows. The presence or absence of itching sound was examined. As a result, no generation of itching sound was observed.

Comparative Examples 7 and 8
Except for changing the thermoplastic resin composition of the T-shaped part to the thermoplastic resin composition of Comparative Examples 1 and 3 as the contact part A, the presence or absence of stagnation noise was examined in the same manner as in Example 20. It was. As a result, it was recognized that stagnation was generated in all cases.

  As is apparent from the above, the thermoplastic resin composition contact parts of the present invention are used for automobile interior parts, office equipment, house interior parts and the like having portions that contact, join, and fit with other members. It turns out that it is suitable.

  The contact component according to the present invention significantly reduces the squeaking noise that occurs when the members rub against each other, and maintains the squeaking noise reduction effect even when left at high temperatures for a long time. It is possible to provide contact parts made of a thermoplastic resin composition having excellent properties, such as automobile interior parts, office equipment, and housing interior parts that have locations that contact, join, and fit with other members. It can be used suitably.

M Object V Drive speed μs Static friction coefficient μl Sawtooth waveform lower end Δμ μs-μl
A Contact parts B Other contact parts 1 Bottom part 2 Rising part 3 Bottom part 4 Rising part

Claims (7)

Thermoplastic containing 20 to 65 parts by mass of rubber-reinforced vinyl resin [A] and 35 to 80 parts by mass of polycarbonate resin [B] (however, 100 parts by mass in total of [A] and [B]) A resin composition [X],
The rubber-reinforced vinyl resin [A] is obtained by polymerizing a vinyl monomer [c1] in the presence of an ethylene / α-olefin rubbery polymer [a1] having a Tm (melting point) of 0 ° C. or higher. And a rubber-reinforced vinyl resin [A2] obtained by polymerizing a vinyl monomer [c2] in the presence of a diene rubber polymer [a2] And
The total amount of the ethylene / α-olefin-based rubbery polymer [a1] and the diene-based rubbery polymer [a2] is 5 to 30% by mass based on 100% by mass of the thermoplastic resin composition [X]. It is a molded product made of a certain thermoplastic resin composition [X], which is used in a place where the thermoplastic resin composition [X] or another molded product made of another thermoplastic resin contacts and rubs. Contact parts made of a thermoplastic resin composition with reduced resistance.   The contact part made of a thermoplastic resin composition according to claim 1, wherein the rubber-reinforced vinyl resin [A] further contains a (co) polymer [C] of a vinyl monomer [c3].   The ethylene / α-olefin rubbery polymer [a1] is composed of 60 to 95% by mass of ethylene and 40 to 5% by mass of α-olefin (however, the total of ethylene and α-olefin is 100% by mass). Item 3. A contact part made of the thermoplastic resin composition according to Item 1 or 2.   The mass ratio [a1]: [a2] of the ethylene / α-olefin rubber polymer [a1] and the diene rubber polymer [a2] is 90-15: 10-85. A contact part made of the thermoplastic resin composition according to any one of the preceding claims.   100 parts by mass of the thermoplastic resin composition [X] and further 0.1 to 8 parts by mass of silicone oil [D] and / or 0.1 to 8 parts by mass of polyolefin wax [E] The contact part made of a thermoplastic resin composition according to any one of claims 1 to 4.   The contact part made of a thermoplastic resin composition according to claim 5, wherein the silicone oil [D] is at least one selected from the group consisting of methylphenyl silicone oil, alkyl-aralkyl-modified silicone oil, and amino-modified silicone oil. .   The thermoplastic resin composition according to any one of claims 1 to 6, which is used for automobile interior parts, switch parts, office equipment parts, desk lock parts, residential interior parts, or indoor door opening / closing damper parts. Product contact parts.

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