JP2017179094A - Article including resin molding portion in contact with paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an article including a resin molding portion in contact with paper, such as a guide, being an internal component of a copier, which is excellent in impact resistance and from which generation of a contact sound due to contact with paper is suppressed.SOLUTION: An article includes a portion in contact with paper, in which at least a part of the surface of the portion in contact with paper is formed of a thermoplastic resin composition (X) including a rubber-reinforced resin (A), and the thermoplastic resin composition (X) has a risk value of generating abnormal sound, measured by using a stick and slip measuring apparatus SSP-02 produced by ZIEGLER Co., of 3 or less under a measurement condition described below, the measurement condition: measurement is conducted by: preparing a test piece with a length of 150 mm, a width of 60 mm, and a thickness of 4 mm and a test piece with a length of 50 mm, a width of 25 mm, and a thickness of 4 mm; sticking a sheet of plain paper to a surface of the latter test piece; and rubbing a resin face of the former test piece and a plain paper face of the latter test piece with each other three times at a temperature of 23°C, humidity of 50%RH, load of 40 N, velocity of 10 mm/sec, and amplitude of 20 mm.SELECTED DRAWING: None

Description

  The present invention is an article having a resin molded body part that comes into contact with paper, such as a guide that is an internal part of a copying machine, and has excellent impact resistance and generation of contact sound when in contact with paper The present invention relates to an article with suppressed

  Office equipment such as copiers, printers, and image scanners that input and output information using paper as a medium, and peripheral equipment (for example, auto feeders and sorters) are inevitably provided with a portion that comes into contact with paper. It is well known that the part and the paper are in dynamic contact during transportation and cause noise.

  In recent years, housings and internal parts of the above devices are often manufactured from resin molded products, while speeding up of the above devices has been pursued in order to improve processing capacity. There is a further need to reduce noise due to dynamic contact with molded parts and improve the quietness of the equipment.

  Conventionally, by attaching a sound-absorbing member made of a sound-absorbing material such as urethane foam to the bottom or side of a paper tray of an image forming apparatus such as a copying machine, noise such as contact sound between the paper and the paper feeding member is reduced. Although it has been proposed to absorb and reduce (Patent Document 1), there is a problem that the number of parts increases.

  In addition, the internal parts of a copying machine are molded from a thermoplastic resin composition in which glass fibers and light calcium carbonate having a specific particle shape are blended into a polymer alloy made of aromatic polyester and styrene resin, thereby providing heat resistance and rigidity. It is reported that not only the improvement but also the surface smoothness and glossiness that does not cause paper jamming due to toner fusion and paper rubbing are brought about. It is not intended for any purpose (Patent Document 2).

JP 2003-89437 A JP 2012-233043 A

  An object of the present invention is an article having a resin molded body part that comes into contact with paper, such as a guide that is an internal part of a copying machine, and has excellent impact resistance and contact sound when in contact with paper. It is in providing the thing by which generation | occurrence | production of this was suppressed.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have included a rubber-reinforced resin as a material of a resin molded body part that comes into contact with the paper of the article, and a thermoplastic resin composition exhibiting a specific noise risk value. By adopting, it has been found that it is excellent in impact resistance and that the generation of the contact sound can be suppressed, and the present invention has been completed. It has also been found that when the thermoplastic resin composition having a melting point in a specific temperature range is used as the material, the generation of the abnormal noise can be particularly suppressed.

Thus, according to one aspect of the present invention, an article having a portion that contacts paper,
At least a part of the surface of the part that comes into contact with paper is formed of a thermoplastic resin composition (X) containing a rubber-reinforced resin (A),
The thermoplastic resin composition (X) is provided with an article having an abnormal noise risk value of 3 or less under the following measurement conditions measured using a stick and slip measuring device SSP-02 manufactured by ZIEGLER. Is done.
Measurement condition:
A test piece having a length of 150 mm, a width of 60 mm, and a thickness of 4 mm, and a test piece having a length of 50 mm, a width of 25 mm, and a thickness of 4 mm are prepared, and plain paper is pasted on one side of the latter test piece. Measured by rubbing the resin surface of the former test piece and the plain paper surface of the latter test piece three times at% RH, a load of 40 N, a speed of 10 mm / second, and an amplitude of 20 mm.

  According to a preferred embodiment of the present invention, the thermoplastic resin composition (X) has crystallinity, specifically, a melting point measured according to JIS K 7121-1987 is in the range of 0 to 120 ° C. What is in is used.

  According to the present invention, in an article having a portion that comes into contact with paper, the thermoplastic resin composition including a rubber reinforced resin as the material of the portion and having the abnormal noise risk value of 3 or less is adopted. In addition, the generation of contact sound when the paper and the part are contacted is suppressed, and the impact resistance of the article or the part is also maintained well.

The present invention will be described in detail below.
In the present invention, “(co) polymerization” means homopolymerization and / or copolymerization, “(meth) acryl” means acryl and / or methacryl, and “(meth) acrylate” Acrylate and / or methacrylate.
Further, the melting point measured in accordance with JIS K 7121-1987 (in this specification, sometimes referred to as “Tm”) is a constant temperature increase of 20 ° C. per minute using DSC (differential scanning calorimeter). This is a value obtained by measuring the endothermic change at a speed and reading the peak temperature of the obtained endothermic pattern.

1. Article of the Invention The article of the present invention is an article provided with a part that comes into contact with paper, in particular, an article provided with a part that comes into contact with paper under movement such as being transported, that is, a part that dynamically comes into contact with paper. As long as it is an article provided with In particular, the article of the present invention is in contact with office equipment such as a printing machine, copying machine, printer, and image scanner that inputs and outputs information using paper as a medium, and peripheral equipment (for example, an auto feeder and sorter). It is suitable as a molding material for an internal part having a portion. Specific examples of the article of the present invention include internal parts such as a copying machine, a printer, a FAX, and an image scanner, such as a guide, a paper tray, and a paper discharge tray.

2. Thermoplastic resin composition (X)
The thermoplastic resin composition (X) (also referred to herein as “component (X)”) used in the article of the present invention is also referred to as rubber-reinforced resin (A) (herein referred to as “component (A)”). ) As an essential component and the abnormal noise risk value is 3 or less. The abnormal noise risk value is a 10-step index indicating the risk of stick-slip abnormal noise when a contact member is made of two types of materials according to the specification of the German Automobile Manufacturers Association (VDA) standard. If the abnormal sound level is 3 or less, it is considered acceptable. The present invention finds that when the thermoplastic resin composition (X) containing the rubber reinforced resin (A) exhibits the abnormal noise risk value of 3 or less, the contact sound with the paper is well suppressed. It is based on that.

  From the viewpoint of impact resistance, the thermoplastic resin composition (X) used in the article of the present invention has a rubber content of 5 to 60% by mass when the entire thermoplastic resin composition (X) is 100% by mass. It is preferable that In addition, when the thermoplastic resin composition (X) has crystallinity or contains a component having crystallinity, the effect of suppressing the generation of contact noise between the molded product and paper is further preferable. Specifically, the melting point measured according to JIS K 7121-1987 is preferably in the range of 0 to 120 ° C, more preferably in the range of 10 to 90 ° C, and still more preferably in the range of 20 to 80 ° C. As described above, the melting point (Tm) is obtained according to JIS K 7121-1987. However, the number of endothermic patterns in the range of 0 to 120 ° C. is not limited to one, and two or more. But you can. Moreover, Tm (melting point) seen in the range of 0 to 120 ° C. may be derived from the following rubber-reinforced resin (A), particularly the rubbery part (a1), or in the rubber-reinforced resin (A). Related additives described below, for example, those derived from a slidability imparting agent such as a low molecular weight polyolefin wax having a number average molecular weight of 10,000 or less may be used. The slidability-imparting agent may be added to the rubber-reinforced resin (A) or may be added directly to the thermoplastic resin composition (X).

  The thermoplastic resin composition (X) used in the article of the present invention may further contain another thermoplastic resin as necessary. Examples of other thermoplastic resins include polycarbonate resins, polyolefin resins, polyester resins, polyamide resins, vinyl chloride resins, silicone resins, and the like. Among these, polycarbonate resins (in this specification, “component (B)”) And a polyolefin resin (also referred to as “component (C)” in this specification) are preferable. The content of other thermoplastic resins in the thermoplastic resin composition (X) of the present invention is determined according to the required impact resistance, heat resistance, appearance of the molded product or other characteristics.

  The content of the polycarbonate resin (B) is preferably 20 to 80% by mass and more preferably 30 to 70% by mass with respect to 100% by mass in total of the component (A) and the component (B). preferable. The content of the rubber-reinforced resin (A) is preferably 80 to 20% by mass and more preferably 70 to 30% by mass with respect to 100% by mass in total of the component (A) and the component (B). . If it is this range, the resin composition excellent in impact resistance and heat resistance will be obtained.

  The content of the polyolefin resin (C) is preferably 30 to 85% by mass and more preferably 50 to 80% by mass with respect to 100% by mass in total of the component (A) and the component (C). preferable. The content of the rubber-reinforced resin (A) is preferably 70 to 15% by mass and more preferably 50 to 20% by mass with respect to 100% by mass in total of the component (A) and the component (C). . If it is this range, the resin composition excellent in the molded article external appearance will be obtained.

  Hereinafter, the thermoplastic resin composition (X) used for the article of the present invention will be described in detail.

2-1. Rubber reinforced resin (A)
The rubber-reinforced resin (A) is suitably used for imparting impact resistance to the thermoplastic resin composition (X), and the rubber content is 100% by mass of the entire thermoplastic resin composition (X). In this case, the content is preferably 5 to 60% by mass. In addition, the rubber-reinforced resin (A) has an excellent function of suppressing the generation of abnormal noise such as contact sound with the paper, which the thermoplastic resin composition (X) has. It is preferable to have. Specifically, the melting point of the thermoplastic resin composition (X) measured according to JIS K 7121-1987 is preferably in the range of 0 to 120 ° C, more preferably in the range of 10 to 90 ° C, 20 A range of ˜80 ° C. is even more preferred.

  The rubber-reinforced resin (A) is composed of, for example, a rubbery part (a1) derived from a rubbery polymer and a resin part (a2) containing a structural unit derived from a vinyl monomer. ) Preferably forms a graft copolymer in which the resin part (a2) is graft-polymerized. Therefore, the rubber-reinforced resin (A) is preferably composed of at least the graft copolymer and a resin part (a2) that is not graft-polymerized on the rubbery part (a1). ) May contain other components such as an ungrafted rubber part (a1) or additives.

  The rubber part (a1) may be a homopolymer or a copolymer as long as it is rubbery (having rubber elasticity) at 25 ° C. The rubbery part (a1) may be composed of either a diene polymer (hereinafter referred to as “diene rubber”) or a non-diene polymer (hereinafter referred to as “non-diene rubber”). . Further, these polymers may be cross-linked polymers or non-cross-linked polymers. Among these, in the present invention, it is preferable that at least a part of the rubbery portion (a1) is composed of a diene rubber from the viewpoint of improving impact resistance. Further, from the viewpoint of the effect of suppressing abnormal noise such as contact noise with paper, it is preferable that at least a part of the rubbery part (a1) is made of non-diene rubber, and the rubbery part (a1) It is particularly preferred that the whole is composed of non-diene rubber.

  Non-diene rubbers include ethylene / α-olefin rubbers; urethane rubbers; acrylic rubbers; silicone rubbers; silicone / acrylic IPN rubbers; (co) polymers containing structural units derived from conjugated diene compounds. Examples thereof include a hydrogenated polymer obtained by hydrogenation (however, the hydrogenation rate is 50% or more). This hydrogenated polymer may be a block copolymer or a random copolymer.

  In the present invention, it is preferable to use ethylene / α-olefin rubber as the non-diene rubber from the viewpoint of the effect of suppressing abnormal noise such as contact noise with paper. The ethylene / α-olefin rubber is a copolymer rubber including a structural unit derived from ethylene and a structural unit derived from an α-olefin. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-decene, 1-dodecene, 1-hexadecene, 1-hexadecene, Eikosen etc. are mentioned. These α-olefins can be used alone or in combination of two or more. The number of carbon atoms of the α-olefin is preferably 3 to 20, more preferably 3 to 12, and still more preferably 3 to 8, from the viewpoint of impact resistance. The mass ratio of ethylene: α-olefin in the ethylene / α-olefin rubber 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 ethylene: α-olefin is within the above range, the resulting molded article is more excellent in impact resistance, which is preferable. The ethylene / α-olefin rubber may contain a structural unit derived from a non-conjugated diene, if necessary. 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 10% by mass, preferably 0 to 5% by mass, more preferably 0 to 3% by mass.

  In the present invention, it is preferable to use an ethylene / α-olefin rubber having a melting point (Tm) of 0 to 120 ° C. The Tm (melting point) of the ethylene / α-olefin rubber is more preferably 10 to 90 ° C., and still more preferably 20 to 80 ° C. The fact that the ethylene / α-olefin rubber has a melting point (Tm) means that the rubber has crystallinity. Therefore, by using an ethylene / α-olefin rubber having such a melting point (Tm), the thermoplastic resin composition (X) has a melting point in the range of 0 to 120 ° C., and is in contact with paper. In addition to impact resistance, the effect of suppressing abnormal noise such as contact noise with paper can be further improved. When the rubber-reinforced resin (A) has such crystallinity, the occurrence of stick-slip phenomenon is suppressed. Therefore, when the molded product and the paper are in dynamic contact, abnormal noise such as contact sound with the paper is generated. Is considered to be suppressed. The stick-slip phenomenon is disclosed in Japanese Patent Application Laid-Open No. 2011-174029.

  The Mooney viscosity (ML1 + 4, 100 ° C .; conforming to JIS K 6300) of the ethylene / α-olefin rubber is usually 5 to 80, preferably 10 to 65, more preferably 10 to 45. When the Mooney viscosity is in the above range, the moldability is excellent and the impact strength and appearance of the molded product are further excellent, which is preferable.

    The ethylene / α-olefin rubber is preferably an ethylene / α-olefin copolymer containing no non-conjugated diene component from the viewpoint of reducing the occurrence of abnormal noise such as contact noise with paper. Among these, ethylene / propylene is preferable. A copolymer, an ethylene / 1-butene copolymer, and an ethylene / 1-octene copolymer are more preferable, and an ethylene / propylene copolymer is particularly preferable.

  The rubber part of the component (A) is preferably composed entirely of a non-diene rubber, particularly an ethylene / α-olefin rubber, from the viewpoint of reducing the contact noise with paper. In addition to the rubber, it may be composed of the diene rubber. When the rubbery portion of the component (A) is composed of the diene rubber in addition to the non-diene rubber, the moldability and impact resistance of the thermoplastic resin composition (X) and the obtained The appearance of the molded product is further satisfactory.

    Diene rubbers include homopolymers such as polybutadiene and polyisoprene; butadienes such as styrene / butadiene copolymers, styrene / butadiene / styrene copolymers, acrylonitrile / styrene / butadiene copolymers, and acrylonitrile / butadiene copolymers. Examples thereof include styrene / isoprene copolymers, styrene / isoprene / styrene copolymers, and isoprene copolymers such as acrylonitrile / styrene / isoprene copolymers. These may be random copolymers or block copolymers. These can be used alone or in combination of two or more. The diene rubbery polymer may be a crosslinked polymer or an uncrosslinked polymer.

  In the present invention, the content of the rubbery part (a1) in the rubber-reinforced resin (A), that is, the rubber content is preferably 3 to 80% by mass, more preferably 100% by mass with respect to 100% by mass of the entire rubber-reinforced resin (A). Is 3 to 65% by mass, more preferably 4 to 55% by mass, still more preferably 5 to 50% by mass, and particularly preferably 7 to 45% by mass. When the content of the rubber part (a1) is within the above range, the impact resistance of the thermoplastic resin composition (X), the effect of reducing abnormal noise such as contact noise with paper, dimensional stability, moldability, etc. Is more preferable.

  The resin part (a2) of the rubber-reinforced resin (A) is composed of a structural unit derived from a vinyl monomer, and the vinyl monomer is not particularly limited, but contains an aromatic vinyl compound. Is preferable, and may be composed of an aromatic vinyl compound and a compound copolymerizable with the aromatic vinyl compound. Specific examples of the aromatic vinyl compound include styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, β-methylstyrene, ethylstyrene, p-tert-butylstyrene, vinyltoluene, vinylxylene, vinyl. And naphthalene. These compounds can be used alone or in combination of two or more. Of these, styrene and α-methylstyrene are preferred, and styrene is particularly preferred.

  As the compound copolymerizable with the aromatic vinyl compound, preferably, at least one selected from a vinyl cyanide compound and a (meth) acrylic acid ester compound can be used, and if necessary, a copolymer with these compounds can be used. Other polymerizable vinyl monomers can also be used. Such other vinyl monomers include maleimide compounds, unsaturated acid anhydrides, carboxyl group-containing unsaturated compounds, hydroxyl group-containing unsaturated compounds, oxazoline group-containing unsaturated compounds, epoxy group-containing unsaturated compounds, and the like. These may be used alone or in combination of two or more.

  Specific examples of the vinyl cyanide compound include acrylonitrile, methacrylonitrile, ethacrylonitrile, α-ethylacrylonitrile, α-isopropylacrylonitrile and the like. These compounds can be used alone or in combination of two or more. Of these, acrylonitrile is preferred.

  Specific examples of the (meth) acrylate compound include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, and (meth) acrylate n. -Butyl, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, tert-butyl (meth) acrylate, hexyl (meth) acrylate, n-octyl (meth) acrylate, (meth) acrylic acid 2 -Ethylhexyl, cyclohexyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate and the like. These compounds can be used alone or in combination of two or more. Of these, methyl methacrylate is preferred.

  Specific examples of the maleimide compound include N-phenylmaleimide and N-cyclohexylmaleimide. These compounds can be used alone or in combination of two or more.

  Specific examples of the unsaturated acid anhydride include maleic anhydride, itaconic anhydride, citraconic anhydride, and the like. These compounds can be used alone or in combination of two or more.

  Specific examples of the carboxyl group-containing unsaturated compound include (meth) acrylic acid, ethacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, cinnamic acid and the like. These compounds can be used alone or in combination of two or more.

  Specific examples of the hydroxyl group-containing unsaturated compound include 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 (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and the like. These compounds can be used alone or in combination of two or more.

  The lower limit of the content of the structural unit derived from the aromatic vinyl compound in the rubber reinforced resin (A) is derived from the structural unit derived from the aromatic vinyl compound and a compound copolymerizable with the aromatic vinyl compound. When the total of the structural units is 100% by mass, it is preferably 40% by mass, more preferably 50% by mass, and still more preferably 60% by mass. The upper limit is usually 100% by mass.

  When the resin part (a2) of the rubber-reinforced resin (A) includes a structural unit derived from an aromatic vinyl compound and a vinyl cyanide compound as a structural unit, the contents of the structural unit derived from the aromatic vinyl compound are both When the total amount is 100% by mass, it is usually 40 to 90% by mass, preferably 55 to 85% by mass, and the content of the structural unit derived from the vinyl cyanide compound is 100% by mass. %, It is 10 to 60% by mass, preferably 15 to 45% by mass.

  The rubber reinforced resin (A) can be produced, for example, by graft polymerization of the vinyl monomer (b) in the presence of the rubber polymer (a). The polymerization method in this production method is not particularly limited as long as the graft copolymer is obtained, and a known method can be applied. As a polymerization method, emulsion polymerization, suspension polymerization, solution polymerization, bulk polymerization, or a combination of these can be used. In these polymerization methods, known polymerization initiators, chain transfer agents (molecular weight regulators), emulsifiers and the like can be appropriately used.

  In the above production method, usually, a (co) polymer of vinyl monomers is graft-polymerized to a rubbery polymer, and a vinyl monomer that is not graft-polymerized to the rubbery polymer. A mixed product of the (co) polymer is obtained. In some cases, the mixed product may contain a rubbery polymer in which the (co) polymer is not graft-polymerized. The rubber-reinforced resin (A) of the present invention comprises a rubber part (a1) derived from a rubbery polymer and a resin part (a2) having a structural unit derived from a vinyl-based monomer. Since a1) preferably forms a graft copolymer in which the resin part (a2) is graft-polymerized, a mixed product of the graft copolymer and (co) polymer produced as described above is used. The rubber-reinforced resin (A) can be used as it is.

  The rubber-reinforced resin (A) is obtained by adding a (co) polymer (A ′) produced by polymerizing a vinyl monomer in the absence of the rubbery polymer (a). Also good. When this (co) polymer (A ′) is added to the rubber-reinforced resin (A), it forms a resin part (a2) that is not graft-polymerized to the rubbery part (a1).

  As described above, in the rubber-reinforced resin (A) of the present invention, the rubbery portion may be a mixture of a non-diene rubber and a diene rubber. As a method for producing such a rubber-reinforced resin (A) containing a plurality of rubbers, for example, in the presence of a rubbery polymer (a) containing a non-diene rubber polymer and a diene rubber polymer. A rubber-reinforced resin produced by graft polymerization of a vinyl monomer (b) in the presence of a non-diene rubber polymer, Further, it can be obtained by a method of mixing with a rubber reinforced resin produced by graft polymerization of the vinyl monomer (b) in the presence of a diene rubber polymer.

  The graft ratio of the rubber reinforced resin (A) is usually 10 to 150%, preferably 15 to 120%, more preferably 20 to 100%, and particularly preferably 20 to 80%. When the graft ratio of the rubber-reinforced resin (A) is in the above range, the impact resistance of the article of the present invention is further improved.

The graft ratio can be determined by the following mathematical formula (1).
Graft rate (mass%) = ((S−T) / T) × 100 (1)
In the above formula, 1 g of rubber reinforced resin (A) is added to 20 ml of acetone, shaken for 2 hours with a shaker at 25 ° C., and then centrifuged at 5 ° C. This is the mass (g) of insoluble matter obtained by centrifuging for 60 minutes in a machine (rotation speed: 23,000 rpm) and separating the insoluble matter and the soluble matter, and T is 1 gram of rubber-reinforced resin (A). It is the mass (g) of the rubbery part (a1) contained. The mass of the rubbery part (a1) can be determined by a method of calculating from the polymerization prescription and the polymerization conversion rate.

  Graft rate is, for example, the type and amount of chain transfer agent used in graft polymerization when producing rubber reinforced resin (A), the type and amount of polymerization initiator, the method of addition and addition of monomer components during polymerization It can adjust by selecting time, superposition | polymerization temperature, etc. suitably.

  The intrinsic viscosity (in methyl ethyl ketone, 30 ° C.) of the acetone-soluble component (hereinafter also referred to as “acetone soluble component”) of the rubber-reinforced resin (A) in the thermoplastic resin composition of the present invention is usually 0.05. It is -0.9 dl / g, Preferably it is 0.07-0.8 dl / g, More preferably, it is 0.1-0.7 dl / g. When the intrinsic viscosity is in the above range, the impact resistance and moldability of the resin composition become better.

  The intrinsic viscosity [η] can be measured by the following method. First, the acetone-soluble component of the rubber-reinforced resin (A) was dissolved in methyl ethyl ketone, and five samples having 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 [η] is, for example, the type and amount of a chain transfer agent used when graft-polymerizing the rubber reinforced resin (A), the type and amount of a polymerization initiator, and a method for adding a monomer component during polymerization The addition time, polymerization temperature, polymerization time and the like can be adjusted by appropriate selection. The rubber-reinforced resin (A) can be adjusted by mixing a (co) polymer (A ′) having an intrinsic viscosity [η] different from the intrinsic viscosity [η] of the acetone-soluble component.

  The rubber reinforced resin (A) may contain a slidability imparting agent and other additives. The slidability imparting agent not only imparts slidability to the thermoplastic resin composition (X) to facilitate assembly of the article of the present invention, but also causes abnormal noise such as a squeaking noise from the article of the present invention during use. The effect which suppresses generation | occurrence | production can be provided. Representative examples of the slidability imparting agent include low molecular weight oxidized polyethylene (c1), ultrahigh molecular weight polyethylene (c2), polytetrafluoroethylene (c3), and the like described in JP2011-137066A. Examples include molecular weight (for example, number average molecular weight 10,000 or less) polyolefin wax, silicone oil, and the like.

  As the polyolefin wax, a polyethylene wax having a melting point of 0 to 120 ° C. is preferable. In addition, when a polyolefin wax having such a melting point or other additive having a melting point of 0 to 120 ° C. is added to the rubber reinforced resin (A), the rubbery portion of the rubber reinforced resin (A) has a melting point ( Even if it does not include (Tm), it is possible to obtain the effect of suppressing the generation of abnormal sounds such as stagnation. These slidability-imparting agents can be used alone or in combination of two or more. The amount of these slidability imparting agents is usually 0.1 to 10 parts by mass with respect to 100 parts by mass of the rubber reinforced resin (A).

  Other additives include antioxidants, UV absorbers, weathering agents, anti-aging agents, fillers, antistatic agents, flame retardants, antifogging agents, lubricants, antibacterial agents, fungicides, Examples thereof include tackifiers, plasticizers, colorants, graphite, carbon black, carbon nanotubes, pigments (for example, pigments having infrared absorption and reflection ability and functionality). These may be used alone or in combination of two or more. The compounding quantity of these additives is 0.1-30 mass parts normally with respect to 100 mass parts of rubber reinforced resin (A).

  The rubber-reinforced resin (A) may contain other resins as long as the object of the present invention is not impaired.

2-2. Polycarbonate resin (B)
The thermoplastic resin composition (X) used in the present invention can contain the polycarbonate resin (B) as described above. When the polycarbonate resin (B) is contained, the heat resistance is improved, which is preferable. In the present invention, the polycarbonate resin (B) is not particularly limited as long as it has a carbonate bond in the main chain, and examples thereof include aromatic polycarbonate, aliphatic polycarbonate, and aliphatic-aromatic polycarbonate. You may use these individually or in combination of 2 or more types. Among these, aromatic polycarbonate is preferable from the viewpoint of impact resistance, heat resistance, and the like. In addition, these polycarbonate resins may have a terminal modified with an R—CO— group and an R′—O—CO— group (R and R ′ each represents an organic group).

  Examples of the aromatic polycarbonate include those obtained by transesterification (transesterification reaction) of an aromatic dihydroxy compound and a carbonic acid diester, those obtained by an interfacial polycondensation method using phosgene, and a reaction product of pyridine and phosgene. What was obtained by the pyridine method using a thing can be used.

  The aromatic dihydroxy compound may be a compound having two hydroxyl groups in the molecule.

  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. These can be used alone or in combination of two or more. 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 (B) 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. On the other hand, the fluidity is not sufficient and the molding processability may be insufficient. 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.

2-3. Polyolefin resin

  As an olefin resin of the component (C) of this invention, the olefin resin which consists of at least 1 sort (s) of C2-C10 olefin is mentioned, for example. This olefin resin (C) can be used alone or in combination of two or more.

  Examples of olefins used for forming the olefin resin (C) include ethylene and propylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, 3-methyl. Examples include α-olefins such as hexene-1 and cyclic olefins such as norbornene. These can be used alone or in combination of two or more. Of these, ethylene, propylene, butene-1, 3-methylbutene-1, 4-methylpentene-1, and norbornene are preferable.

  Other monomers that can be used as necessary in the formation of the olefin resin (C) include 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene 7-methyl-1, Non-conjugated dienes such as 6-octadiene and 1,9-decadiene are exemplified. These can be used alone or in combination of two or more.

As the olefin resin (C), a polymer mainly containing a propylene unit such as polypropylene and a propylene / ethylene copolymer, polyethylene, and an ethylene-norbornene copolymer are preferable, and these may be used alone or in combination. It may be used. The propylene / ethylene copolymer includes a random copolymer and a block copolymer, and any of them can be used.
As the polyethylene, any of high density polyethylene, low density polyethylene, linear low density polyethylene and the like can be used.
Furthermore, as the olefin resin (C) used in the present invention, one obtained by decatalyzing a polymerization catalyst or one modified with an acid anhydride, a carboxyl group, an epoxy group or the like can also be used.

It does not matter whether the olefin resin (C) has crystallinity, but it is preferable to use at least one of those having a crystallinity by X-ray diffraction of 10% or more at room temperature.
Moreover, it is preferable to use at least 1 type whose melting | fusing point measured based on JISK7212 of an olefin resin (C) is 40 degreeC or more.
When a polypropylene resin is used as the component (C) of the present invention, the melt flow rate measured according to JIS K7210: 1999 (230 ° C., load 2.16 kg) is preferably 0.01 to 500 g / 10 min. More preferably, it is 0.05 to 100 g / 10 min. When a polyethylene resin is used, the melt flow rate measured according to JIS K6922-2 (190 ° C., load 2.16 kg) is preferably 0.00. The amount is from 01 to 500 g / 10 minutes, more preferably from 0.05 to 100 g / 10 minutes, and particularly preferably from 0.1 to 60 g / 10 minutes.
Furthermore, in order to more effectively achieve the stagnation noise reduction that is the object of the present invention, it is particularly preferable to use a polyethylene resin among the olefin resins.

3. Production method of thermoplastic resin composition (X) of the present invention The thermoplastic resin composition (X) of the present invention is prepared by mixing each component in a predetermined blending ratio with a tumbler mixer, a Henschel mixer, etc. It can be produced by melt-kneading under suitable conditions using a kneader such as a twin-screw extruder, Banbury mixer, kneader, roll, feeder ruder or the like. A preferred kneader is a twin screw extruder. Furthermore, when kneading each component, these components 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. The melt kneading temperature is usually 180 to 240 ° C, preferably 190 to 230 ° C.

4). Manufacturing method of article of the present invention The article of the present invention can be manufactured by forming at least a portion in contact with paper with a molded article of the thermoplastic resin composition (X), and the entire thermoplastic resin composition ( You may comprise with the molded article of X). The molded article can be produced by molding the thermoplastic resin composition (X) by a known molding method such as injection molding, press molding, sheet extrusion molding, vacuum molding, profile extrusion molding, foam molding or the like.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited only to a following example. In the examples, parts and% are based on mass unless otherwise specified.

1. Raw material [P]
As the rubber-reinforced aromatic vinyl resin, the ethylene / α-olefin rubber-reinforced aromatic vinyl resin (raw material P1) obtained in Synthesis Example 1 below was used.

1-1. Synthesis Example 1 (Synthesis of raw material P1 (ethylene / propylene (EP) rubber-reinforced aromatic vinyl resin))
A stainless steel autoclave equipped with a ribbon-type stirrer blade, an auxiliary agent continuous addition device, a thermometer, and the like is placed on an ethylene / propylene copolymer rubber (ethylene / propylene = 78/22 (%), Tm: 40 ° C., glass transition temperature: −50 ° C., Mooney viscosity (ML1 + 4, 100 ° C.): 20) 30 parts, 52.5 parts of styrene, 17.5 parts of acrylonitrile, 120 parts of toluene, the internal temperature is raised to 70 ° C., and the contents of the autoclave Was stirred for 1 hour to obtain a homogeneous solution. Thereafter, 0.5 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., and 0.2 part of octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenol) -propionate was added. Subsequently, the reaction liquid was extracted from the autoclave, and unreacted substances and the solvent were distilled off by steam distillation. Thereafter, the volatile matter was substantially degassed using a 40 mmφ vented extruder (cylinder temperature 220 ° C., vacuum degree 760 mmHg), and pelletized to obtain an ethylene / α-olefin rubber-reinforced aromatic vinyl resin. The graft ratio of the graft resin contained in this resin is 55%, and the content of ungrafted (co) polymer (hereinafter referred to as “acetone soluble content”) is 53.5%. The intrinsic viscosity [η] (in methyl ethyl ketone, 30 ° C.) was 0.32 dl / g.

1-2. Synthesis Example 2 (Synthesis of raw material P2 (ethylene / propylene (EP) rubber reinforced aromatic vinyl resin))
Instead of ethylene / propylene copolymer rubber, ethylene / propylene / dicyclopentadiene copolymer (ethylene / propylene / dicyclopentadiene = 63/32/5 (%), Mooney viscosity (ML1 + 4,100 ° C.) 33, melting point ( Tm) None and a glass transition temperature (Tg) of −52 ° C. was used to obtain an ethylene / α-olefin rubber-reinforced aromatic vinyl resin by the same method as in Synthesis Example 1. The graft ratio of the graft resin contained in this resin is 60%, and the content of ungrafted (co) polymer (hereinafter referred to as “acetone soluble content”) is 52%. The viscosity [η] (in methyl ethyl ketone, 30 ° C.) was 0.4 dl / g.

1-3. Synthesis Example 3 (Synthesis of raw material P3 (diene rubber reinforced aromatic vinyl resin))
In a polymerization vessel equipped with a stirrer, 280 parts of water, 60 parts of a polybutadiene latex having a weight average particle size of 0.26 μm and a gel fraction of 90% (in terms of solid content), 0.3 part of sodium formaldehyde sulfoxylate, 0.1 part of ferrous sulfate. 0025 parts, 0.01 parts of disodium ethylenediaminetetraacetate, after deoxygenation, heated to 60 ° C. with stirring in a nitrogen stream, 10 parts of acrylonitrile, 30 parts of styrene, 0.2 parts of t-dodecyl mercaptan, A monomer mixture consisting of 0.3 part of cumene hydroperoxide 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 diene rubber reinforced aromatic vinyl resin was obtained. The obtained resin has a graft ratio of 40%, an ungrafted (co) polymer content (hereinafter referred to as “acetone soluble content”) of 16%, and an intrinsic viscosity [η] of the acetone soluble content. Was 0.38 dl / g.

2. Raw material [Q]
The following raw material Q1 was used as a thermoplastic resin not including a portion derived from a rubber polymer.

2-1. Raw material Q1 (AS resin)
An acrylonitrile / styrene copolymer having a ratio of acrylonitrile units and styrene units of 27% and 73%, respectively, and an intrinsic viscosity [η] (in methyl ethyl ketone, 30 ° C.) of 0.47 dl / g. The glass transition temperature (Tg) was 103 ° C.

3. Raw material [R]
3-1. Raw material R1 (PC resin)
A polycarbonate resin “Taflon A2200 (trade name)” manufactured by Idemitsu Kosan Co., Ltd. was used. The viscosity average molecular weight (Mv) was 22,000, and the glass transition temperature (Tg) was 153 ° C.

4). Raw material [S]
4-1. Raw material S1 (polyethylene resin)
High density polyethylene “Novatec HDHJ560” (trade name) manufactured by Nippon Polyethylene Co., Ltd. was used. The melt flow rate was 7 g / 10 min, and the melting point (Tm) was 135 ° C.

5. Raw material [T]
5-1. Raw material T1 (polyolefin wax)
A polyethylene wax “Sun Wax 171-P (trade name)” manufactured by Sanyo Chemical Industries, Ltd. was used. The number average molecular weight (Mn) was 1500 and the melting point (Tm) was 101 ° C.

5-2. Raw material T2 (silicone oil)
Silicone oil “KF-54 (trade name)” manufactured by Shin-Etsu Silicone Co., Ltd. was used. The kinematic viscosity at 25 ° C. was 400 cSt.

Examples 1 to 17 and Comparative Example 1
1. Production of Thermoplastic Resin Composition Raw materials [P], [Q], [R], [S] and [T] shown in Table 1 were mixed in the mixing ratio shown in the same table. Then, it melt-kneaded at the cylinder temperature of Table 1 and pelletized using the twin-screw extruder (model name "TEX44, Nippon Steel Works"). The obtained resin composition was used for the following measurement and evaluation. The results are shown in the table below.

2. Melting point (Tm)
In accordance with JIS K7121-1987, a DSC (differential scanning calorimeter) was used to measure an endothermic change at a constant temperature increase rate of 20 ° C. per minute, and the obtained endothermic pattern was obtained from the peak temperature.

3. A Charpy impact strength resin composition was molded to prepare a test piece of 120 mm × 80 mm × 2 mm, and measured according to ISO179. Molding was performed using an injection molding machine IS100GN (trade name: manufactured by Toshiba Machine) under the conditions of cylinder temperature, mold temperature 50 ° C., injection speed 40 mm / s, and injection pressure 100 MPa of Table 1.

3. Itching sound evaluation I and II (abnormal noise risk value) :
By injection-molding the thermoplastic resin composition under the conditions of cylinder temperature, injection pressure 50 MPa, mold temperature 60 ° C. in Table 1 using an injection molding machine “IS-170FA” (trade name) manufactured by Toshiba Machine From the obtained molded product having a length of 150 mm, a width of 100 mm, and a thickness of 4 mm, test pieces having a length of 150 mm, a width of 60 mm, a thickness of 4 mm, and a length of 50 mm, a width of 25 mm, and a thickness of 4 mm were cut out with a disc saw. After chamfering the end of the test piece with sandpaper of count # 100, fine burrs were removed with a cutter knife to obtain two large and small test pieces for evaluation of stagnation.
Among the test pieces for evaluation, a test piece having a length of 150 mm, a width of 60 mm, and a thickness of 4 mm was left in an oven tank adjusted to 60 ± 5 ° C. for 100 hours, and then cooled at 25 ° C. for 24 hours to be thermally aged. A test specimen for evaluation was obtained.
Of the above test pieces for evaluation, plain paper (copy paper "WHITE PPC" (trade name) manufactured by KOKUYO Co., Ltd.), basis weight: 64 g / m ² , weight: 55 kg , Paper thickness: 92 μm, whiteness: 92% (ISO method), ECF pulp 100%), and these two large and small test pieces were set on a stick slip tester SSP-02 manufactured by ZIEGLER. Under the conditions of a temperature of 23 ° C., a humidity of 50% RH, a load of 40 N or 95 N, a speed of 1 mm / second or 10 mm / second, an abnormal noise risk value was measured when the paper surface and the resin surface were rubbed three times with an amplitude of 20 mm ( Itching sound evaluation II). Moreover, the abnormal noise risk value was also measured by the same method as described above except that heat aging was not performed (smudge noise evaluation I). In addition, since this test method evaluates by carrying out heat aging, it can also evaluate the sustainability of the stagnation sound reduction effect.

Table 1 shows the following.
Examples 1 to 17 using the thermoplastic resin composition [X] of the present invention were found to have a low noise risk value and an excellent effect of suppressing contact sound with paper.
On the other hand, in Comparative Examples 1 and 2 not including the rubber reinforced resin, the effect of suppressing the contact sound with the paper was not obtained.

  The present invention can be suitably applied to an article provided with a resin molded body portion that comes into contact with paper, and can be suitably used, for example, to manufacture internal parts of office equipment and peripheral equipment.

Claims (9)

An article with a portion that contacts paper,
At least a part of the surface of the part that comes into contact with paper is formed of a thermoplastic resin composition (X) containing a rubber-reinforced resin (A),
The thermoplastic resin composition (X) is an article having an abnormal noise risk value of 3 or less under the following measurement conditions, measured using a stick and slip measuring device SSP-02 manufactured by ZIEGLER.
Measurement condition:
A test piece having a length of 150 mm, a width of 60 mm, and a thickness of 4 mm, and a test piece having a length of 50 mm, a width of 25 mm, and a thickness of 4 mm are prepared, and plain paper is pasted on one side of the latter test piece. Measured by rubbing the resin surface of the former test piece and the plain paper surface of the latter test piece three times at% RH, a load of 40 N, a speed of 10 mm / second, and an amplitude of 20 mm. The rubber-reinforced resin (A) is
The article according to claim 1, comprising a rubbery part (a1) derived from a rubbery polymer and a resin part (a2) comprising a structural unit derived from an aromatic vinyl monomer. The article according to claim 1 or 2, wherein the thermoplastic resin composition (X) has a rubber content of 5 to 60 mass%. The article according to any one of claims 1 to 3, wherein the thermoplastic resin composition (X) has a melting point (measured according to JIS K 7121-1987) in the range of 0 to 120 ° C. The article according to any one of claims 2 to 4, wherein the rubbery polymer portion (A-1) is derived from an ethylene / α-olefin rubbery polymer. The article according to any one of claims 1 to 5, wherein the thermoplastic resin composition (X) contains a slidability imparting agent. The article according to claim 6, wherein the slidability-imparting agent is at least one selected from the group consisting of a low molecular weight polyolefin wax and silicone oil. The article according to any one of claims 1 to 7, which is an internal part of a copying machine. 9. The article according to claim 8, wherein the copying machine internal part is a guide disposed inside the copying machine.