JP2016180119A - Slidability improving agent, thermoplastic resin composition and sliding member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition having an excellent balance among slidability, color developing property and impact resistance strength, and to provide a slidability improving agent enabling such properties to be imparted to the thermoplastic resin.SOLUTION: The slidability improving agent is provided which is composed of powder of a rubber-containing graft copolymer (G) obtained by graft polymerization of a rubber containing polyorganosiloxane with one or more vinyl monomers, and in which a content of the polyorganosiloxane in the rubber-containing graft copolymer (G) is 40-95 mass%, and a mass average particle diameter Dw of latex of the rubber-containing graft copolymer (G) is 300-2,000 nm. A thermoplastic resin composition for a slide member containing the slidability improving agent and a thermoplastic resin is also provided.SELECTED DRAWING: None

Description

  The present invention provides a polyorganosiloxane-containing graft that improves the impact resistance of a thermoplastic resin and exhibits high flame retardancy, slidability, and color development (pigment coloring) in a molded product obtained from the thermoplastic resin. It relates to a copolymer. The present invention also relates to a thermoplastic resin composition having high flame retardancy, slidability, and color developability (pigment colorability) containing the graft copolymer, and a molded product thereof.

  The present invention also relates to a slidability improver comprising a polyorganosiloxane-containing graft copolymer having excellent slidability, color developability (pigment colorability), and impact strength, and a heat containing the slidability improver. The present invention relates to a plastic resin composition and a sliding member formed by molding the thermoplastic resin composition.

  Thermoplastic resin compositions that are flame retardant and excellent in mechanical properties are in great demand in markets such as the electric and electronic fields, and high performance is required. Polycarbonate resin, in particular, is a general-purpose engineering plastic that is excellent in transparency, impact resistance, heat resistance, dimensional stability, and so on. It is widely used industrially as a material in the electronic field. Among these, parts such as personal computer exterior parts are required to have high flame retardancy and impact resistance. These parts are required to have high flame resistance equivalent to UL94V-0 and V-1 in order to satisfy such safety requirements.

  In addition, these parts have recently become thinner year by year for the purpose of reducing the size, weight, and functionality. Therefore, there is a demand for a resin material that is excellent in mechanical properties such as sufficient impact resistance and excellent in flame retardancy and heat resistance even in a molded product that is thinned and lightened.

  Therefore, in order to improve the flame retardancy of thermoplastic resins, particularly polycarbonate resins, conventionally, a method of blending a halogen flame retardant or a phosphorus flame retardant has been made. However, a thermoplastic resin composition containing a halogen-based flame retardant containing chlorine or bromine has a problem of generating a corrosive gas during combustion, and the use of a flame retardant that does not contain these is desired.

  In addition, a product using a thermoplastic resin composition containing an excessive amount of a phosphorus flame retardant may bleed out from the product and cause environmental pollution when discarded. For this reason, the thermoplastic resin composition to which high flame retardance was provided without reducing or using the usage-amount of a phosphorus flame retardant as much as possible is strongly desired.

  In addition, molded products obtained from these materials may cause defects such as cracks due to adhesion of chemicals such as hand creams and detergents, and have excellent chemical resistance so that such defects do not occur. There is also a need for thermoplastic resin compositions.

  Various materials have been proposed for the purpose of improving flame retardancy and impact resistance. For example, Patent Document 1 proposes a flame retardant thermoplastic resin composition comprising a graft copolymer containing 65 to 99% by weight of a polyorganosiloxane, a polycarbonate resin, and a phosphate ester compound. In Patent Document 2, 10 to 60% by mass of a vinyl monomer containing a (meth) acrylate monomer having an aryl group or benzyl group is polymerized in the presence of 40 to 90% by mass of a polyorganosiloxane rubber. The resulting graft copolymers have been proposed. Patent Document 3 discloses a composite rubber-based graft copolymer containing polyorganosiloxane and polyalkyl acrylate, wherein the content of polyorganosiloxane is 30 to 70% by mass, the volume average particle size is 300 to 2000 nm, A thermoplastic resin composition including a composite rubber-based graft copolymer having a diameter distribution Dw / Dn (mass average particle diameter / number average particle diameter) of 1.0 to 2.0 and a resin component has been proposed.

  In addition, molded articles used in the fields of automobiles, electrical / electronic devices, OA devices such as printers, and the like are required to have slidability, color developability (pigment colorability), high impact resistance, and the like. In recent years, with the spread of hybrid vehicles and electric vehicles, there are an increasing number of cases in which slidability is required to prevent squeaking noises in parts fitted in the vehicle.

  In order to improve the sliding property of the thermoplastic resin, a method of adding low molecular weight polytetrafluoroethylene or silicone oil to the thermoplastic resin is known, but the impact strength of the thermoplastic resin is reduced. Is a problem. Therefore, for example, a proposal to add sliding properties while preventing a decrease in strength by blending a thermoplastic resin with a polyorganosiloxane-containing graft copolymer obtained by graft-polymerizing a vinyl monomer to a rubber component containing polyorganosiloxane. Has been made.

  For example, Patent Document 4 discloses a silicone / acrylic composite rubber-based graft copolymer having a number average particle diameter of 300 to 2000 nm and a polyorganosiloxane content of 20 to 70% by mass, and the composite rubber-based graft copolymer. A thermoplastic resin composition containing a polymer has been proposed. Patent Document 5 describes a thermoplastic resin composition excellent in slidability containing a polyorganosiloxane-containing graft copolymer having a polyorganosiloxane content of 60 to 90% by mass. Patent Document 6 proposes a composite rubber-based graft copolymer having a high polyorganosiloxane content.

JP 2000-17136 A JP 2011-63706 A JP 2011-179016 A JP 2004-359889 A WO06 / 11384 JP 2011-26476 A

  However, the molded product obtained in Patent Document 1 is not satisfactory in flame retardancy, impact resistance and color development. The molded body obtained in Patent Document 2 is not satisfactory in flame retardancy, impact resistance and slidability. Moreover, the molded object obtained by patent document 3 cannot satisfy a flame retardance and sliding property.

  Patent Document 4 describes improvements in impact resistance and pigment colorability, but does not describe sliding properties. The rubber-based graft copolymers of Patent Document 5 and Patent Document 6 have insufficient color developability due to the small volume average particle diameter.

  The objective of this invention is providing the thermoplastic resin composition which has high impact resistance, without impairing the coloring property and flame retardance of a thermoplastic resin large. Another object of the present invention is to provide a graft copolymer capable of imparting such properties to a thermoplastic resin (hereinafter referred to as “first problem”).

  Another object of the present invention is to provide a thermoplastic resin composition having an excellent balance of slidability, color developability and impact strength, and a slidability improver capable of imparting such properties to the thermoplastic resin. (Hereinafter, these are referred to as “second problems”).

  The “first problem” is solved by the following first invention groups [1] to [25].

[1] A rubber-containing graft copolymer obtained by graft-polymerizing one or more vinyl monomers to a rubber containing a polyorganosiloxane (B1), and containing a vinyl polymerizable group in the polyorganosiloxane (B1) The content of the component derived from the silane compound is 1 to 10% by mass, the volume average particle size of the rubber-containing graft copolymer is 300 to 2000 nm, and the polyorganosiloxane in the rubber-containing graft copolymer A rubber-containing graft copolymer (G _F1 ) having a content of (B1) of 70 to 98% by mass and a graft ratio determined by the following formula (1) of 10% by mass or less.

wa: mass (g) of acetone insoluble matter of the sample,
wo: total amount of sample (g),
R: The fraction (% by mass) of rubber containing polyorganosiloxane (B1) in the raw material charged when the graft copolymer was produced.

[2] A rubber-containing graft copolymer obtained by graft-polymerizing one or more vinyl monomers to a composite rubber containing a polyorganosiloxane (B1) and a polyalkyl (meth) acrylate (B2), the polyorganosiloxane The content of the component derived from the vinyl-based polymerizable group-containing silane compound in (B1) is 1 to 10% by mass, the volume average particle size of the rubber-containing graft copolymer is 300 to 2000 nm, and the rubber The rubber-containing graft wherein the content of the polyorganosiloxane (B1) in the containing graft copolymer is 70 to 98% by mass and the acetone soluble content is 5.0% by mass or more and 30.0% by mass or less. Copolymer (G _F2 ).

[3] A rubber-containing graft copolymer obtained by graft-polymerizing one or more vinyl monomers to rubber containing polyorganosiloxane (B1), which contains a vinyl polymerizable group in the polyorganosiloxane (B1) The content of the component derived from the silane compound is 1 to 10% by mass, the volume average particle size of the rubber-containing graft copolymer is 300 to 2000 nm, and the polyorganosiloxane in the rubber-containing graft copolymer A rubber-containing graft copolymer (G1) in which the content of (B1) is 70 to 98% by mass and the content of the component derived from the polyfunctional vinyl monomer is more than 0% and less than 5% by mass. _F3 ).

  [4] The rubber-containing graft copolymer according to any one of [1] to [3], wherein the volume average particle diameter is 400 to 1000 nm.

  [5] The rubber according to [2], wherein the ratio “B1 / B2” of the polyorganosiloxane (B1) and the polyalkyl (meth) acrylate (B2) is “74/26 to 99/1” mass%. Containing graft copolymer.

  [6] 0.1 to 12 parts by mass of the rubber-containing graft copolymer according to any one selected from the above [1] to [5] with respect to 100 parts by mass of the thermoplastic resin (A), a fluororesin ( A thermoplastic resin composition containing 0.01 to 5 parts by mass of C) and 0.01 to 10 parts by mass of a flame retardant (D).

  [7] The thermoplastic resin composition according to [6], wherein the thermoplastic resin (A) is a thermoplastic resin having at least one bond selected from a carbonate bond, an ester bond, and an amide bond.

  [8] The thermoplastic resin composition according to [6], wherein the thermoplastic resin (A) is a polycarbonate resin.

  [9] The thermoplastic resin composition according to any one of [6] to [8], wherein the flame retardant (D) includes at least one flame retardant selected from a phosphorus flame retardant and an organic metal salt flame retardant. object.

  [10] A molded product obtained by molding the thermoplastic resin composition according to any one of [6] to [9].

  [11] The content of rubber containing the polyorganosiloxane (B1) in 100% by mass of the graft copolymer is 85 to 99% by mass, and any one selected from [1] to [5]. Rubber-containing graft copolymer.

  [12] In 100% by mass of the monomer raw material for the polyorganosiloxane (B1), the amount of the siloxane-based crosslinking agent used is 0 to 30% by mass, and the monomer for the graft copolymer In 100% by mass of the raw material, the amount of the vinyl polymerizable group-containing silane compound used is 0.7 to 9.8% by mass, and the amount of the polyfunctional vinyl monomer used is more than 0% by mass and 5% by mass. The rubber-containing graft copolymer according to [11], which is less than%.

  [13] In 100% by mass of the monomer raw material for the polyorganosiloxane (B1), the amount of the siloxane-based crosslinking agent used is 0.1 to 10% by mass, and the single amount for the graft copolymer In 100% by mass of the body raw material, the amount of the vinyl polymerizable group-containing silane compound used is 0.7 to 9.8% by mass, and the amount of the polyfunctional vinyl monomer used is 0.1% by mass or more. The rubber-containing graft copolymer according to [11], which is 3% by mass or less.

  [14] The rubber composition containing polyorganosiloxane (B1) in 100% by mass of the graft copolymer is 71% by mass or more and less than 85% by mass, and any one of [1] to [5] The rubber-containing graft copolymer described.

  [15] The grafting vinyl monomer contains a polyfunctional vinyl monomer, and the amount of the polyfunctional vinyl monomer used is 100% by mass in the monomer raw material for the graft copolymer. The rubber-containing graft copolymer according to [14], which is more than 0% by mass and 4% by mass or less.

  [16] The graft vinyl monomer contains a polyfunctional vinyl monomer, and the amount of the polyfunctional vinyl monomer used in 100% by mass of the monomer raw material for the graft copolymer The rubber-containing graft copolymer according to [14], in which is 0.1 to 1% by mass.

  [17] The graft vinyl monomer does not contain a polyfunctional vinyl monomer, and the rubber containing the polyorganosiloxane (B1) is a polyorganosiloxane (B1) and a polyalkyl (meth) acrylate (B2). And a polyfunctional vinyl monomer contained in the (meth) acrylate component for composite rubber and the vinyl monomer for grafting in 100% by mass of the monomer raw material for the graft copolymer. The rubber-containing graft copolymer according to the above [14], wherein the total amount of the monomer used exceeds 0% by mass and is 4% by mass or less.

  [18] The graft vinyl monomer does not contain a polyfunctional vinyl monomer, and the rubber containing the polyorganosiloxane (B1) contains the polyorganosiloxane (B1) and the polyalkyl (meth) acrylate (B2). And a polyfunctional vinyl monomer contained in the composite rubber (meth) acrylate component and the graft vinyl monomer in 100% by mass of the monomer raw material for the graft copolymer. The rubber-containing graft copolymer according to the above [14], wherein the total amount used of the body is 0.1 to 1% by mass.

  [19] The graft vinyl monomer does not contain a polyfunctional vinyl monomer, the rubber containing the polyorganosiloxane (B1) does not contain a polyalkyl (meth) acrylate (B2), and In 100% by mass of the monomer raw material for the polyorganosiloxane (B1), the amount of the siloxane-based crosslinking agent used is 0 to 1.8% by mass, and the monomer raw material for the graft copolymer is 100% by mass. % Of the rubber-containing graft copolymer according to [14], wherein the amount of the vinyl polymerizable group-containing silane compound used is 0.7 to 5% by mass.

  [20] The graft vinyl monomer does not contain a polyfunctional vinyl monomer, the rubber containing the polyorganosiloxane (B1) does not contain a polyalkyl (meth) acrylate (B2), and In 100% by mass of the monomer raw material for the polyorganosiloxane (B1), the amount of the siloxane-based crosslinking agent used is 0.1 to 1.6% by mass, and the monomer raw material 100 for the graft copolymer is 100% by mass. The rubber-containing graft copolymer according to [14], wherein the amount of the vinyl polymerizable group-containing silane compound used is 0.7 to 1.5% by mass in mass%.

  [21] 0.1 to 12 parts by mass of the rubber-containing graft copolymer according to any one selected from [11] to [20], 100% by mass of the thermoplastic resin (A), a fluororesin ( A thermoplastic resin composition containing 0.01 to 5 parts by mass of C) and 0.01 to 10 parts by mass of a flame retardant (D).

  [22] The thermoplastic resin composition according to [21], wherein the thermoplastic resin (A) is a thermoplastic resin having at least one bond selected from a carbonate bond, an ester bond, and an amide bond.

  [23] The thermoplastic resin composition according to [21], wherein the thermoplastic resin (A) is a polycarbonate resin.

  [24] The thermoplastic resin composition according to any one of [21] to [23], wherein the flame retardant (D) includes at least one flame retardant selected from a phosphorus flame retardant and an organometallic salt flame retardant. object.

  [25] A molded product obtained by molding the thermoplastic resin composition according to any one of [21] to [24].

  The “second problem” is solved by the following second invention group [26] to [36].

[26] A sliding property improving agent comprising polyorganosiloxanes one or more vinyl monomers on rubbers containing from powder of a graft-polymerized rubber-containing graft copolymer (G _S), the rubber-containing graft The content of the polyorganosiloxane in the copolymer (G _S ) is 40 to 95% by mass, and the latex of the rubber-containing graft copolymer (G _S ) has a mass average particle diameter Dw of 300 to 2000 nm. Mobility improver.

[27] The latex particle diameter distribution (mass average particle diameter Dw / number average particle diameter Dn) of the rubber-containing graft copolymer (G _S ) is 1.0 to 2.0. Sliding property improver.

[28] The content of the polyorganosiloxane of the rubber-containing graft copolymer (G _S) is replaced by a sliding property improving agent according to the a 41 to 74 wt% [26] or [27].

[29] The weight average particle diameter Dw of the latex of the rubber-containing graft copolymer (G _S) is, sliding property improving agent according to any one of the a 400~1000nm [26] - [28].

  [30] The slidability improving agent according to any one of [26] to [29], wherein the rubber containing the polyorganosiloxane is a composite rubber containing polyorganosiloxane and polyalkyl acrylate.

  [31] A thermoplastic resin composition for a sliding member, comprising the slidability improver according to any one of [26] to [30] and a thermoplastic resin.

  [32] The thermoplastic resin for a sliding member according to [31], wherein the content of the slidability improver is 4 to 16% by mass and the content of the thermoplastic resin is 96 to 84% by mass. Composition.

  [33] The sliding member according to [31], wherein the content of the sliding property improving agent is 5.1 to 16% by mass, and the content of the thermoplastic resin is 94.9 to 84% by mass. Thermoplastic resin composition.

  [34] The thermoplastic resin for a sliding member according to [31], wherein the content of the slidability improver is 7 to 15% by mass and the content of the thermoplastic resin is 93 to 85% by mass. Composition.

  [35] The thermoplastic resin composition for sliding members according to any one of [31] to [34], wherein the thermoplastic resin is a polycarbonate resin.

  [36] A sliding member formed by molding the thermoplastic resin composition for a sliding member according to any one of [31] to [35].

  By blending the graft copolymer of the first invention group with a thermoplastic resin, it is possible to obtain a resin composition having high impact resistance without significantly impairing the color developability and flame retardancy of the thermoplastic resin. it can.

  The slidability improver of the second invention group can provide a resin composition that is excellent in the balance between color developability and impact strength, while imparting slidability when blended with a thermoplastic resin.

It is a figure which shows the measurement points A (gate vicinity) and B (center part) of arithmetic mean roughness Ra of an injection molding test piece. Reference numeral 1 denotes a gate.

  In the present invention, “(meth) acrylate” means at least one of “acrylate” and “methacrylate”. The “(co) polymer” means at least one of “polymer” and “copolymer”.

  Hereinafter, although the present invention will be described in detail, all the descriptions regarding materials, manufacturing conditions, and the like are descriptions common to the first invention group and the second invention group unless otherwise specified.

<Rubber-containing graft copolymer>
The rubber-containing graft copolymer of the present invention (hereinafter sometimes abbreviated as “graft copolymer”) is a copolymer obtained by graft-polymerizing one or more vinyl monomers to rubber containing polyorganosiloxane (B1). It is a polymer.

[Rubber containing polyorganosiloxane]
The rubber containing polyorganosiloxane is preferably a polyorganosiloxane rubber or a composite rubber containing polyorganosiloxane and polyalkyl (meth) acrylate.

[Polyorganosiloxane]
A polyorganosiloxane is a polymer containing an organosiloxane unit as a constituent unit. The polyorganosiloxane rubber can be obtained by polymerizing “organosiloxane” and “vinyl-based polymerizable group-containing silane compound”, or an organosiloxane mixture containing components used as necessary. Examples of the components used as necessary include siloxane-based crosslinking agents and siloxane oligomers having terminal blocking groups.

  As the organosiloxane, either a chain organosiloxane or a cyclic organosiloxane can be used. Cyclic organosiloxane is preferred because it has high polymerization stability and a high polymerization rate. The cyclic organosiloxane is preferably a 3- to 7-membered ring, and examples thereof include the following. Hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, trimethyltriphenylcyclotrisiloxane, tetramethyltetraphenylcyclotetrasiloxane, octaphenylcyclotetrasiloxane and the like. These may be used alone or in combination of two or more. Among these, since it is easy to control the particle size distribution of rubber containing polyorganosiloxane, it is preferable that 60% by mass or more is octamethylcyclotetrasiloxane.

[Vinyl polymerizable group-containing silane compound]
A silane compound containing a vinyl polymerizable group is used as a siloxane graft crossing agent. The vinyl-based polymerizable group-containing silane compound has a siloxy group and a functional group copolymerizable with a vinyl monomer. By using a vinyl polymerizable group-containing silane compound, a polyorganosiloxane having a functional group copolymerizable with a vinyl monomer can be obtained. By using such a graft crossing agent, an alkyl (meth) acrylate component for composite rubber described later or a vinyl monomer can be grafted to the polyorganosiloxane by radical polymerization.

  Examples of the vinyl polymerizable group-containing silane compound include siloxane represented by the formula (1).

In formula (1), R ¹ represents a methyl group, an ethyl group, a propyl group, or a phenyl group. R ² represents an organic group in the alkoxyl group, and examples thereof include a methyl group, an ethyl group, a propyl group, and a phenyl group. n represents 0, 1 or 2. R represents any group represented by formulas (2) to (5).

In these formulas, R ³ and R ⁴ each represent hydrogen or a methyl group, and p represents an integer of 1 to 6.

  A methacryloyloxyalkyl group can be mentioned as a functional group represented by Formula (2). Examples of the siloxane having this group include the following. β-methacryloyloxyethyldimethoxymethylsilane, γ-methacryloyloxypropylmethoxydimethylsilane, γ-methacryloyloxypropyldimethoxymethylsilane, γ-methacryloyloxypropyltrimethoxysilane, γ-methacryloyloxypropylethoxydiethylsilane, γ-methacryloyloxypropyl Diethoxymethylsilane, δ-methacryloyloxybutyldiethoxymethylsilane and the like.

  As a functional group represented by Formula (3), a vinylphenyl group etc. can be mentioned, for example. Examples of the siloxane having this group include vinylphenylethyldimethoxysilane.

  Examples of the siloxane having a functional group represented by the formula (4) include vinyltrimethoxysilane and vinyltriethoxysilane.

  Examples of the functional group represented by the formula (5) include a mercaptoalkyl group. Examples of the siloxane having this group include the following. γ-mercaptopropyldimethoxymethylsilane, γ-mercaptopropylmethoxydimethylsilane, γ-mercaptopropyldiethoxymethylsilane, γ-mercaptopropylethoxydimethylsilane, γ-mercaptopropyltrimethoxysilane and the like.

  Among these, a vinyl polymerizable group-containing silane compound having a functional group represented by Formula (2), Formula (4), and Formula (5) is preferably used from the viewpoint of economy, and among these, Formula (2) A vinyl-based polymerizable group-containing silane compound having a functional group represented by

  These vinyl polymerizable group-containing silane compounds may be used alone or in combination of two or more. Content of a vinyl polymerizable group containing silane compound is 1-10 mass% in 100 mass% of organosiloxane mixtures, and it is preferable that it is 1-5 mass%. When the amount of the vinyl polymerizable group-containing silane compound is less than 1% by mass, the resulting molded article is deteriorated in appearance, impact resistance and flame retardancy. Even if the amount of the vinyl-based polymerizable group-containing silane compound exceeds 10% by mass, the resulting molded article has low impact resistance and flame retardancy.

  As the siloxane-based crosslinking agent, those having a siloxy group are preferable. By using a siloxane-based crosslinking agent, a polyorganosiloxane having a crosslinked structure can be obtained. Examples of the siloxane crosslinking agent include trifunctional or tetrafunctional crosslinking agents such as trimethoxymethylsilane, triethoxyphenylsilane, tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, and tetrabutoxysilane. Can be mentioned. Among these, a tetrafunctional crosslinking agent is preferable, and tetraethoxysilane is more preferable. The content of the siloxane-based crosslinking agent is preferably 0 to 30% by mass in 100% by mass of the organosiloxane mixture, more preferably 0.1 to 30% by mass, and 0.1 to 10% by mass. Is more preferable, 0.1 to 1.8% by mass is particularly preferable, and 0.1 to 1.6% by mass is most preferable.

  The siloxane oligomer having a terminal blocking group means a siloxane oligomer having an alkyl group or the like at the terminal of the organosiloxane oligomer and stopping the polymerization of the polyorganosiloxane. Examples of the siloxane oligomer having a terminal blocking group include hexamethyldisiloxane, 1,3-bis (3-glycidoxypropyl) tetramethyldisiloxane, and 1,3-bis (3-aminopropyl) tetramethyldisiloxane. And methoxytrimethylsilane.

[Production method of polyorganosiloxane rubber]
There is no restriction | limiting in particular as a manufacturing method of polyorganosiloxane rubber, For example, the following manufacturing methods are employable.

  First, an emulsion is prepared by emulsifying an organosiloxane mixture containing an organosiloxane and a vinyl-based polymerizable group-containing silane compound, or a component further used as necessary, with an emulsifier and water, and then using an acid catalyst. And polymerize at high temperature. The acid is then neutralized with an alkaline substance to obtain a polyorganosiloxane rubber latex.

  In this production method, emulsion preparation methods include a method using a homomixer that makes fine particles by shearing force by high-speed rotation, a method that mixes by high-speed agitation using a homogenizer that makes fine particles by jet output from a high-pressure generator, etc. Is mentioned. Among these, a method using a homogenizer is a preferable method because the particle size distribution of the polyorganosiloxane rubber latex becomes narrow.

  As a method for mixing the acid catalyst during the polymerization, (1) a method in which an acid catalyst is added together with an organosiloxane mixture, an emulsifier and water and mixed, and (2) an acid catalyst aqueous solution is added to an emulsion of the organosiloxane mixture. Examples include a method of adding continuously or all at once, and a method of (3) dropping an emulsion of an organosiloxane mixture into a hot acid catalyst aqueous solution at a constant rate and mixing. Since it is easy to control the particle diameter of the polyorganosiloxane, a method in which an emulsion of an organosiloxane mixture is maintained at 70 to 85 ° C., and then an aqueous acid catalyst solution is added continuously or collectively is preferable.

  In the case of the first invention group, the polymerization temperature is preferably 50 ° C. or higher, and more preferably 70 ° C. or higher. The polymerization time is usually 2 hours or more, preferably 5 hours or more when the acid catalyst aqueous solution is added all at once to the emulsion for polymerization.

  In the case of the second invention group, the polymerization temperature is preferably 50 ° C to 95 ° C, more preferably 70 ° C to 95 ° C. In addition, the polymerization time is preferably 2 to 15 hours, more preferably 5 to 10 hours when the acid catalyst is mixed with the organosiloxane mixture, the emulsifier and water, and the polymerization is carried out after atomization.

  Furthermore, since the cross-linking reaction between silanols proceeds at a temperature of 30 ° C. or lower, in order to increase the cross-linking density of the polyorganosiloxane, after polymerization at a high temperature of 50 ° C. or higher, 5 at a temperature of 30 ° C. or lower. It can also be held for about 100 hours from time.

  The polymerization reaction of the organosiloxane mixture can be terminated by neutralizing the latex to pH 6-8 with an alkaline substance such as sodium hydroxide, potassium hydroxide, or aqueous ammonia solution.

  The emulsifier used in the production method is not particularly limited as long as the organosiloxane mixture can be emulsified, but an anionic emulsifier or a nonionic emulsifier is preferable. Examples of the anionic emulsifier include the following. Sodium alkylbenzene sulfonate, sodium alkyl diphenyl ether disulfonate, sodium alkyl sulfate, sodium polyoxyethylene alkyl sulfate, sodium polyoxyethylene nonyl phenyl ether sulfate, and the like.

  Examples of nonionic emulsifiers include the following. Polyoxyethylene alkyl ether, polyoxyethylene alkylene alkyl ether, polyoxyethylene distyrenated phenyl ether, polyoxyethylene tribenzyl phenyl ether, polyoxyethylene polyoxypropylene glycol and the like.

  These emulsifiers may be used individually by 1 type, and may use 2 or more types together.

  The amount of the emulsifier used is preferably 0.05 to 10 parts by mass and more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the organosiloxane mixture. It is possible to adjust to a desired particle size depending on the amount of emulsifier used. When the amount of the emulsifier used is 0.05 parts by mass or more, the emulsion stability of the emulsion of the organosiloxane mixture becomes sufficient, and when the amount of the emulsifier used is 10 parts by mass or less, the graft copolymer caused by the emulsifier Coloring of the coalescence and a decrease in the heat decomposability of the resin composition can be suppressed.

  Examples of the acid catalyst used for polymerization of the organosiloxane mixture include sulfonic acids such as aliphatic sulfonic acid, aliphatic substituted benzenesulfonic acid, and aliphatic substituted naphthalenesulfonic acid, and mineral acids such as sulfuric acid, hydrochloric acid, and nitric acid. These acid catalysts may be used individually by 1 type, and may use 2 or more types together. Among these, the use of mineral acids such as sulfuric acid, hydrochloric acid, and nitric acid can narrow the particle size distribution of the polyorganosiloxane rubber latex, and further, molding caused by the emulsifier component in the polyorganosiloxane rubber latex. The appearance defect of the body can be reduced. The amount of the acid catalyst used can be adjusted to a desired particle size. For example, 0.1 to 0.5 parts by mass of 95% sulfuric acid is used with respect to 100 parts by mass of the organosiloxane mixture. It is preferable.

  The mass average particle diameter Dw of the polyorganosiloxane rubber latex is preferably 250 nm to 1000 nm. By adjusting the mass average particle diameter of the latex of the polyorganosiloxane rubber to 250 nm to 1000 nm, the volume average particle diameter of the graft copolymer or the mass average particle diameter of the latex of the graft copolymer is adjusted to 300 to 2000 nm. Is possible.

  The particle size distribution (mass average particle size Dw / number average particle size Dn) of the latex of the rubber containing polyorganosiloxane is preferably 1.0 to 1.7. By setting Dw / Dn to 1.0 to 1.7, a graft copolymer having high color development can be obtained.

  In addition, the mass average particle diameter Dw and the number average particle diameter Dn of the latex of the rubber containing the polyorganosiloxane, and the mass average particle diameter Dw, the number average particle diameter Dn of the latex of the graft copolymer and the volume of the graft copolymer. A method for measuring the average particle size will be described later.

  An emulsifier may be added to the rubber latex containing the polyorganosiloxane obtained by the above method, if necessary, for the purpose of improving mechanical stability. As the emulsifier, the same anionic emulsifier and nonionic emulsifier as those exemplified above are preferable.

[Composite rubber]
In the present invention, as a rubber containing polyorganosiloxane, a composite rubber containing polyorganosiloxane (B1) and polyalkyl (meth) acrylate (B2) (hereinafter sometimes abbreviated as “composite rubber”) is used. Can do. The composite rubber is a rubber containing the polyorganosiloxane and a polyalkyl (meth) acrylate having a glass transition temperature (Tg) represented by the following FOX formula of 0 ° C. or less.

  1 / (273 + Tg) = Σ (wi / (273 + Tgi)).

  In the above formula, Tg is the glass transition temperature (° C.) of the copolymer, wi is the mass fraction of monomer i, and Tgi is the glass transition temperature of the homopolymer obtained by polymerizing monomer i. (° C). The value of Tg of the homopolymer is a value described in POLYMER HANDBOOK Volume 1 (WILEY-INTERSCIENCE).

  The composite rubber is preferably a rubber obtained by polymerizing an alkyl (meth) acrylate in the presence of a polyorganosiloxane rubber.

  The polyalkyl (meth) acrylate (B2) constituting the composite rubber can be obtained by polymerizing an alkyl (meth) acrylate component (hereinafter sometimes abbreviated as “(meth) acrylate component for composite rubber”). . The (meth) acrylate component for composite rubber preferably contains “alkyl (meth) acrylate having a homopolymer Tg of 0 ° C. or lower” and “crosslinkable monomer”.

  Examples of the alkyl (meth) acrylate having a homopolymer Tg of 0 ° C. or lower include ethyl acrylate, n-propyl acrylate, n-butyl acrylate, i-butyl acrylate, 2-ethylhexyl acrylate, and the like. These may be used alone or in combination of two or more. Among these, n-butyl acrylate is particularly preferable in consideration of the impact resistance of the thermoplastic resin composition and the gloss of the molded product.

  Examples of the “crosslinkable monomer” include the following “polyfunctional vinyl monomers”. Allyl (meth) acrylate, triallyl cyanurate, triallyl isocyanurate, divinylbenzene, diallyl phthalate, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, 1,4-butylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, triallyl trimellitate and the like. These may be used alone or in combination of two or more.

[Production method of composite rubber]
There is no restriction | limiting in particular as a manufacturing method of composite rubber, For example, although it can manufacture by an emulsion polymerization method, suspension polymerization method, and fine suspension polymerization method, it is preferable to use an emulsion polymerization method. In particular, the (meth) acrylate component for composite rubber is added to the latex of the polyorganosiloxane rubber, and the (meth) acrylate component for composite rubber is impregnated into the rubber particles, and then the (meth) acrylate component for composite rubber is emulsified. A method of polymerizing to obtain a composite rubber latex is particularly preferred.

  As a method of preparing a mixture of a polyorganosiloxane rubber latex and a composite rubber (meth) acrylate component, the alkyl (meth) acrylate and the polyfunctional vinyl monomer are added to the polyorganosiloxane rubber latex. A method is mentioned. Thus, the (meth) acrylate component for the composite rubber is impregnated in the particles of the polyorganosiloxane rubber, and then the temperature is raised and polymerization is performed by using a known radical polymerization initiator. In this production method, as a method of adding the (meth) acrylate component for the composite rubber to the latex of the polyorganosiloxane rubber, there are a method of adding the whole amount in a lump, and a method of adding dropwise at a constant rate. Can be mentioned.

  In producing the latex of the composite rubber, an emulsifier can be added in order to stabilize the latex and control the mass average particle size of the latex of the composite rubber. The emulsifier is not particularly limited, and an anionic emulsifier and a nonionic emulsifier are preferable.

  Examples of the anionic emulsifier include the following. Sodium alkylbenzene sulfonate, sodium alkyl diphenyl ether disulfonate, sodium alkyl sulfate, polyoxyethylene alkyl sodium sulfate, polyoxyethylene nonyl phenyl ether sodium sulfate, sodium sarcosine, fatty acid potassium, fatty acid sodium, alkenyl succinate dipotassium, rosin acid soap, Polyoxyethylene alkyl sodium phosphate, polyoxyethylene alkyl calcium phosphate, etc.

  Examples of the nonionic emulsifier include polyoxyethylene alkyl ether, polyoxyethylene distyrenated phenyl ether, and polyoxyethylene tribenzyl phenyl ether. These emulsifiers may be used individually by 1 type, and may use 2 or more types together.

  Examples of the radical polymerization initiator used for the polymerization of the (meth) acrylate component for composite rubber include an azo initiator, a peroxide, and a redox initiator that is a combination of a peroxide and a reducing agent. These may be used alone or in combination of two or more. Among these, an azo initiator and a redox initiator are preferable from the viewpoint of suppressing outgassing of the resin composition.

  Examples of the azo initiator include the following. Oil-soluble azo initiators such as 2,2′-azobisisobutyronitrile and dimethyl 2,2′-azobis (2-methylpropionate); 4,4′-azobis (4-cyanovaleric acid) 2,2′-azobis [N- (2-carboxymethyl) -2-methylpropionamidine] hydrate, 2,2′-azobis- (N, N′-dimethyleneisobutylamidine) dihydrochloride, 2 , 2′-azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride and other water-soluble azo initiators. These may be used alone or in combination of two or more.

  Examples of peroxides include the following. Inorganic peroxides such as hydrogen peroxide, potassium persulfate, ammonium persulfate, diisopropylbenzene hydroperoxide, p-menthane hydroperoxide, cumene hydroperoxide, t-butyl hydroperoxide, succinic acid peroxide, t- Butyl peroxyneodecanoate, t-butyl peroxyneoheptanoate, t-butyl peroxypivalate, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, t-butyl Organic peroxides such as peroxy-2-ethylhexanoate. These peroxides may be used alone or in combination of two or more.

  When a peroxide is used as a redox initiator in combination with a reducing agent, the above peroxide, a reducing agent such as sodium formaldehyde sulfoxylate, L-ascorbic acid, fructose, dextrose, sorbose, inositol, and sulfuric acid It is preferable to use a combination of monoiron and ethylenediaminetetraacetic acid disodium salt.

  These reducing agents may be used individually by 1 type, and may use 2 or more types together. In addition, when using sodium formaldehyde sulfoxylate as a reducing agent, it is preferable to suppress the usage-amount as much as possible from a viewpoint of suppressing the outgas of a resin composition.

  When using an azo initiator, the amount used is preferably 0.01 to 1 part by mass with respect to 100 parts by mass of the composite rubber.

  When using a redox-type initiator, it is preferable that the usage-amount of a peroxide is 0.01-10 mass parts with respect to 100 mass parts of (meth) acrylate components for composite rubber. It is preferable that the usage-amount of a reducing agent is 0.01-1 mass part with respect to 100 mass parts of composite rubber.

  The ratio “B1 / B2” of the polyorganosiloxane (B1) and the polyalkyl (meth) acrylate (B2) in the composite rubber is preferably “74/26 to 99/1” mass%, “80 / 20 to 95/5 "% by mass is more preferable. By setting the ratio of “B1 / B2” to “74/26 to 99/1” mass%, the impact strength of the molded product obtained by molding becomes favorable, which is preferable.

[Graft copolymer]
The rubber-containing graft copolymer of the present invention can be obtained by graft polymerization of one or more vinyl monomers in the presence of a rubber containing polyorganosiloxane. Therefore, in the graft copolymer of the present invention, the graft portion is formed of a polymer of one or more vinyl monomers. Although the vinyl monomer will be described later, a “polyfunctional vinyl monomer” can be used as the vinyl monomer.

In the following description, the graft copolymers (G _F1 ), (G _F2 ) and (G _F3 ) of the “first aspect”, “second aspect” and “third aspect” of the first invention group will be described. ) May be collectively referred to as a graft copolymer (G _F ). In addition, the graft copolymer of the second invention group is referred to as a graft copolymer (G _S ).

In the first invention group, the volume average particle diameter of the graft copolymer (G _F ) is 300 to 2000 nm. The volume average particle diameter is preferably 400 to 1000 nm, more preferably 400 to 800 nm, and particularly preferably 410 to 550 nm. When the volume average particle diameter of the graft copolymer (G _F ) is 300 nm or more, the molded product obtained by blending the graft copolymer (G _F ) with a thermoplastic resin has impact resistance (particularly low temperature impact resistance). Property). Further, when the volume average particle diameter of the graft copolymer (G _F ) is 2000 nm or less, a molded product obtained by blending the graft copolymer (G _F ) with a thermoplastic resin has color development and impact resistance ( In particular, the low temperature impact resistance) is good and the surface appearance is good.

In the first invention group, the content of “polyorganosiloxane” in 100% by mass of the graft copolymer (G _F ) is 70 to 98% by mass. This content is preferably 70 to 90% by mass, and more preferably 75 to 85% by mass. When the content of polyorganosiloxane is 70% by mass or more, the flame retardancy and slidability and impact strength at low temperature of the molded product are good, and when it is 98% by mass or less, the surface appearance of the molded product is good, which is preferable. .

In the first invention group, the content of “rubber containing polyorganosiloxane” in 100% by mass of the graft copolymer (G _F ) is preferably 71 to 99% by mass, and more preferably 85 to 99% by mass. If the content of the rubber containing polyorganosiloxane is 71% by mass or more, the impact strength of the molded product at a low temperature is sufficient, and if it is 99% by mass or less, the surface appearance of the molded product is favorable.

[Graft ratio]
The graft ratio of the graft copolymer (G _F1 ) of the “first aspect” of the first invention group is 10% by mass or less. If the graft ratio is 10% by mass or less, the slidability and flame retardancy of the molded product can be improved. The graft ratio is preferably -20% by mass or more. The graft ratio is more preferably -20 to 8% by mass, further preferably -20 to 5% by mass, and particularly preferably -5 to 5% by mass. When the graft ratio is within this range, the obtained molded product exhibits high impact resistance, slidability, and flame retardancy.

wa: mass (g) of acetone insoluble matter of the sample,
wo: total amount of sample (g),
R: The fraction (% by mass) of rubber containing polyorganosiloxane (B1) in the raw material charged when the graft copolymer was produced.

  In addition, the graft ratio in this invention is a value calculated based on the acetone insoluble content wa calculated | required experimentally and the rubber | gum fraction R in a raw material as mentioned above. Theoretically, the mass wa of the acetone-insoluble component corresponds to the total of the mass wr of the rubber containing polyorganosiloxane and the mass wv of the component derived from the vinyl monomer graft-polymerized thereto, and “wo × R / 100”. Corresponds to the mass of the rubber containing the collected polyorganosiloxane.

  However, since the sample total amount wo actually includes by-products and unreacted raw materials of the polymerization reaction in addition to the graft copolymer, the value of “wo × R / 100” is “the acetone insoluble content of the sample. The mass wa ”may be exceeded, and the experimentally determined graft ratio may be a negative value.

  In order to bring the value of the graft ratio within the above range, the following methods (1) to (4) may be mentioned.

(1) When the target value of the rubber content containing the polyorganosiloxane (B1) in 100% by mass of the graft copolymer (G _F ) is 85 to 99% by mass, the polyorganosiloxane (B1) In 100% by mass of the monomer raw material, the amount of the siloxane crosslinking agent used is 0 to 30% by mass, preferably 0.1 to 10% by mass, and the monomer raw material 100 for the graft copolymer (G _F ) is used. In mass%, the amount of vinyl polymerizable group-containing silane compound used is 0.7 to 9.8 mass%, and the amount of polyfunctional vinyl monomer used is more than 0 mass% and less than 5 mass%, preferably Is a method of 0.1 mass% or more and 3 mass% or less.

(2) Graft copolymer (G _F ) The target value of the content of rubber containing polyorganosiloxane (B1) in 100% by mass is less than 85% by mass, and the vinyl monomer for grafting is polyfunctional vinyl. In the case where the monomer is included, the amount of the polyfunctional vinyl monomer used exceeds 100% by mass and is 4% by mass or less in 100% by mass of the monomer raw material for the graft copolymer (G _F ). The method is preferably 0.1 to 3% by mass, more preferably 0.1 to 2% by mass, and still more preferably 0.1 to 1% by mass.

(3) The target value of the content of the rubber containing polyorganosiloxane (B1) in 100% by mass of the graft copolymer (G _F ) is less than 85% by mass, and the grafting vinyl monomer is a polyfunctional vinyl. Graft copolymer (G _F ) when no rubber is contained and the rubber containing polyorganosiloxane (B1) is a composite rubber containing polyorganosiloxane (B1) and polyalkyl (meth) acrylate (B2) The total amount of polyfunctional vinyl monomers contained in the (meth) acrylate component for composite rubber and the vinyl monomer for grafting exceeds 100% by mass in 100% by mass of the monomer raw material for use, and exceeds 4% by mass. % Or less, preferably 0.1 to 3% by mass, more preferably 0.1 to 2% by mass, and still more preferably 0.1 to 1% by mass.

(4) The target value of the rubber content containing the polyorganosiloxane (B1) in 100% by mass of the graft copolymer (G _F ) is less than 85% by mass, and the vinyl monomer for grafting is a polyfunctional vinyl. 100% by mass of monomer raw material for polyorganosiloxane (B1) when the rubber does not contain a monomer and the rubber containing polyorganosiloxane (B1) is a rubber not containing polyalkyl (meth) acrylate (B2) The amount of the siloxane crosslinking agent used is 0 to 1.8% by mass, preferably 0.1 to 1.6% by mass, and 100% by mass of the monomer raw material for the graft copolymer (G _F ) In the method, the amount of the vinyl polymerizable group-containing silane compound used is 0.7 to 5% by mass, preferably 0.7 to 1.5% by mass.

[Acetone-soluble matter]
The graft copolymer (G _F2 ) of the “second aspect” of the first invention group has an acetone soluble content of 5.0 mass% or more and 30.0 mass% or less. The acetone-soluble content is more preferably 5.0% by mass or more and 20.0% by mass or less. A molded product obtained by blending a graft copolymer (G _F2 ) with a thermoplastic resin with an acetone soluble content of 5.0 mass% or more and 30.0 mass% or less has slidability and impact resistance. Strength and flame retardancy are improved. In order to obtain such a graft copolymer (G _F2 ), it is necessary to appropriately select the amount and type of the vinyl polymerizable group-containing silane compound and the polyfunctional vinyl monomer. Specifically, in 100% by mass of the monomer raw material for the graft copolymer (G _F ), the amount of the vinyl polymerizable group-containing silane compound used is 0.7 to 9.8% by mass, and the polyorgano In 100% by mass of the monomer raw material for siloxane (B1), the amount of the siloxane crosslinking agent used is 0 to 30% by mass, preferably 0.1 to 10% by mass, and the graft copolymer (G _F ). In 100% by mass of the monomer raw material for use, the amount of the polyfunctional vinyl monomer used exceeds 0% by mass and is less than 5% by mass, preferably 0.1% by mass to 3% by mass, A graft copolymer having an acetone-soluble content of 5.0% by mass or more and 30.0% by mass or less can be obtained. A method for measuring the acetone soluble part of the graft copolymer will be described later.

In the first invention group, the content of the component derived from the polyfunctional vinyl monomer in 100% by mass of the graft copolymer (G _F ) is not particularly limited, but is 0% by mass to 10% by mass. It is preferably more than 0% by mass and less than 5% by mass, more preferably more than 0% by mass and 3% by mass or less, more preferably 0.1% by mass to 1.5% by mass. % Or less is particularly preferable, and 0.1% by mass or more and 1.0% by mass or less is most preferable. When the content of the component derived from the polyfunctional vinyl monomer is 0% by mass or more and 10% by mass or less, the obtained molded article exhibits high impact resistance and slidability.

The content of the component derived from the polyfunctional vinyl monomer in 100% by mass of the graft copolymer (G _F3 ) of the “third aspect” of the first invention group exceeds 0% by mass and is 5% by mass. %, Preferably 0.01% by mass or more and 3% by mass or less. When the content of the component derived from the polyfunctional vinyl monomer is within this range, the obtained molded article exhibits high impact resistance, slidability, and flame retardancy.

In the first invention group, the content of the component derived from the vinyl polymerizable group-containing silane compound in 100% by mass of the graft copolymer (G _F ) is not particularly limited, but is 0.7 to 9.8. It is preferable that it is mass%, It is more preferable that it is 0.7-5 mass%, It is further more preferable that it is 0.7-1.5 mass%.

In the second invention group, the latex of the graft copolymer (G _S ) has a mass average particle diameter of 300 to 2000 nm. If the mass average particle diameter of the latex is 300 nm or more, the color developability of the molded product obtained from the thermoplastic resin composition is good, and if the mass average particle size of the latex is 2000 nm or less, the molded product at a low temperature. Good impact resistance. The mass average particle diameter of the latex is preferably 400 to 2000 nm, more preferably 400 to 1000 nm, still more preferably 410 to 650 nm, and particularly preferably 420 to 550 nm.

In the second invention group, the particle size distribution (mass average particle size Dw / number average particle size Dn) of the latex of the graft copolymer (G _S ) is preferably 1.0 to 2.0. More preferably, it is 0.0-1.5. When the particle size distribution (Dw / Dn) of the latex is 2.0 or less, the color developability (pigment colorability) of the molded product obtained from the thermoplastic resin composition is good. In addition, the measuring method of the mass average particle diameter Dw and the number average particle diameter Dn is mentioned later.

In the second invention group, the content of “polyorganosiloxane” in the graft copolymer (G _S ) is 40 to 95% by mass. When the content is 40% by mass or more, the slidability of the molded body is sufficiently exhibited, and the impact resistance at low temperature is also good. Moreover, if this content is 95 mass% or less, the color development property (pigment coloring property) of a molded object is favorable. This content is preferably 41 to 74% by mass, and more preferably 50 to 70% by mass.

In the second invention group, the content of “rubber containing polyorganosiloxane” in 100% by mass of the graft copolymer (G _S ) is preferably 65 to 99% by mass, and more preferably 80 to 95% by mass. If the content of the rubber containing polyorganosiloxane is 65% by mass or more, the impact strength of the molded product at a low temperature is sufficient, and if it is 99% by mass or less, the surface appearance of the molded product is favorable.

  In the present invention, the rubber containing polyorganosiloxane (B1) is preferably a composite rubber containing polyorganosiloxane (B1) and polyalkyl (meth) acrylate (B2). A composite rubber containing polyorganosiloxane and polyalkyl acrylate is more preferable, and a composite rubber containing polyorganosiloxane and polybutyl acrylate is more preferable. If the rubber containing the polyorganosiloxane (B1) is a composite rubber, the impact resistance of the molded article will be good. Moreover, if the rubber | gum containing polyorganosiloxane (B1) is composite rubber, the flame retardance of a molded object will become favorable.

  In the graft copolymer of the present invention, the graft portion is formed by a polymer of one or more kinds of vinyl monomers, and the glass transition temperature of the polymer expressed by the above-mentioned FOX formula exceeds 0 ° C., preferably Is 50 ° C. or higher. Although it does not specifically limit as a vinyl monomer used for graft polymerization, For example, the following are mentioned. Styrene, α-methylstyrene, p-methylstyrene, p-t-butylstyrene, p-methoxystyrene, o-methoxystyrene, 2,4-dimethylstyrene, chlorostyrene, bromostyrene, vinyltoluene, vinylnaphthalene, vinylanthracene Aromatic vinyl monomers such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, 4-t -Butylphenyl (meth) acrylate, monobromophenyl (meth) acrylate, dibromophenyl (meth) acrylate, 2,4,6-tribromophenyl (meth) acrylate, monochlorophenyl (meth) acrylate, dichlorophenyl (Meth) acrylates such as (meth) acrylate, trichlorophenyl (meth) acrylate and naphthyl (meth) acrylate; carboxyl group-containing monomers such as (meth) acrylic acid and carboxyethyl (meth) acrylate; (meth) acrylonitrile Vinyl cyanide monomers such as vinyl methyl ether and vinyl ethyl ether; vinyl ether monomers such as vinyl benzoate, vinyl acetate and vinyl butyrate; glycidyl (meth) acrylate and allyl glycidyl Vinyl monomers having a glycidyl group such as ether; olefins such as ethylene, propylene and butylene. These vinyl monomers may be used alone or in combination of two or more.

  When using 2 or more types, a vinyl monomer mixture may contain a "polyfunctional vinyl monomer" as needed. Examples of the polyfunctional vinyl monomer include the following. Allyl (meth) acrylate, triallyl cyanurate, triallyl isocyanurate, divinylbenzene, diallyl phthalate, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, 1,4-butylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, triallyl trimellitate. These may be used alone or in combination of two or more.

  Among these, when one or more kinds of vinyl monomers contain a (meth) acrylic acid ester such as methyl (meth) acrylate, the obtained graft copolymer is contained in a thermoplastic resin (A) such as a polycarbonate resin. Excellent compatibility and dispersibility. When one or more vinyl monomers contain an aromatic vinyl monomer such as styrene, a molded product obtained by molding a thermoplastic resin composition is excellent in flame retardancy. Therefore, it is preferable to use these vinyl monomers alone or in combination.

  Various chain transfer agents and graft crossing agents for adjusting the molecular weight and graft ratio of the graft polymer can be added to the raw material used in the graft polymerization.

[Method for producing graft copolymer]
Examples of the polymerization method for the graft portion include a method in which one or more vinyl monomers for graft polymerization are added to rubber latex containing polyorganosiloxane and polymerization is performed in one or more stages. When polymerizing in multiple stages, it is preferable to polymerize by adding one or more vinyl monomers for graft polymerization in succession in the latex of the polyorganosiloxane rubber-based rubber or by adding them sequentially or continuously. . Such a polymerization method has good polymerization stability and can stably obtain a latex of a graft copolymer having a desired particle size and particle size distribution.

  In the polymerization of the graft part, an emulsifier can be added to the raw material as necessary. Examples of the emulsifier include the same emulsifiers as those used in the production of the composite rubber, and anionic emulsifiers and nonionic emulsifiers are preferable. As the usage-amount of an emulsifier, 0.1-10 mass parts is preferable with respect to 100 mass parts of vinyl monomers for graft polymerization, and 0.2-5 mass parts is more preferable.

  Examples of the polymerization initiator used for the polymerization of the graft portion include the same polymerization initiators used for producing the composite rubber, and azo initiators and redox initiators are preferable.

  When the graft copolymer powder is recovered from the latex of the graft copolymer, either a spray drying method or a coagulation method can be used.

  The spray drying method is a method in which a latex of a graft copolymer is sprayed in the form of fine droplets in a drier and dried by applying a heating gas for drying to the latex. Examples of the method for generating fine droplets include a rotating disk type, a pressure nozzle type, a two-fluid nozzle type, and a pressurized two-fluid nozzle type. The capacity of the dryer may be a small capacity as used in a laboratory or a large capacity as used industrially. The temperature of the heating gas for drying is preferably 200 ° C. or less, and more preferably 120 to 180 ° C.

  Two or more types of graft copolymer latices produced separately may be spray dried together. Furthermore, in order to prevent blocking during spray drying and improve powder characteristics such as bulk specific gravity, an optional component such as silica can be added to the latex of the graft copolymer and spray dried.

  The coagulation method is a method of coagulating the latex of the graft copolymer, separating, recovering, and drying the graft copolymer. First, a graft copolymer latex is introduced into hot water in which a coagulant is dissolved, salted out, and solidified to separate the graft copolymer. Next, the separated wet graft copolymer is dehydrated to recover the graft copolymer having a reduced water content. The recovered graft copolymer is dried using a press dehydrator or a hot air dryer.

  Examples of the coagulant include inorganic salts such as aluminum chloride, aluminum sulfate, sodium sulfate, magnesium sulfate, and sodium nitrate, organic salts such as calcium acetate, and acids such as sulfuric acid, and calcium acetate is particularly preferable. These coagulants may be used alone or in combination of two or more. When a coagulant is used in combination, it is necessary to select a combination that does not form an insoluble salt in water. For example, the combined use of calcium acetate and sulfuric acid or a sodium salt thereof is not preferable because a calcium salt insoluble in water is formed.

  The above-mentioned coagulant is usually used as an aqueous solution. The concentration of the aqueous solution of the coagulant is preferably 0.1% by mass or more, particularly 1% by mass or more from the viewpoint of stably coagulating and recovering the graft copolymer. In addition, if the amount of the coagulant remaining in the recovered graft copolymer is large, the thermal decomposition resistance of the molded product is deteriorated, so the concentration of the coagulant aqueous solution is 20% by mass or less, particularly 15% by mass or less. It is preferable. Although the quantity of the coagulant aqueous solution with respect to latex is not specifically limited, It is preferable that it is 10 to 500 mass parts with respect to 100 mass parts of latex.

  The method of bringing the latex into contact with the coagulant aqueous solution is not particularly limited, but the following methods are usually mentioned. (1) A method in which a latex is continuously added to the aqueous solution of the coagulant while stirring, and is maintained for a certain period of time. (2) The aqueous solution of the coagulant and latex are continuously added in a container with a stirrer at a constant ratio. The mixture containing the coagulated polymer and water is continuously withdrawn from the container. The temperature at which the latex is brought into contact with the coagulant aqueous solution is not particularly limited, but is preferably 30 ° C. or higher and 100 ° C. or lower. The contact time is not particularly limited.

  The coagulated graft copolymer is washed with about 1 to 100 times by mass of water, and the wet graft copolymer separated by filtration is dried using a fluid dryer, a press dehydrator or the like. The drying temperature and drying time may be appropriately determined depending on the Tg of the obtained graft copolymer. In addition, without recovering the graft copolymer discharged from the press dehydrator or the extruder, the graft copolymer may be directly sent to an extruder or a molding machine for producing the resin composition, and mixed with a thermoplastic resin to obtain a molded body. Is possible.

  In the present invention, the graft copolymer is preferably recovered using a coagulation method from the viewpoint of thermal decomposition resistance of a resin composition obtained by mixing with a thermoplastic resin.

  In the graft copolymer powder recovered in this way, when the vinyl monomer is graft polymerized, there is a (co) polymer polymerized without graft bonding to the rubber containing polyorganosiloxane. May be included.

<Thermoplastic resin composition>
The graft copolymer of the first invention group can be mixed with the thermoplastic resin (A) and used as a thermoplastic resin composition. As the thermoplastic resin composition, a thermoplastic resin composition containing a thermoplastic resin (A), a graft copolymer (G _F ), a fluororesin (C) and a flame retardant (D) is preferable.

[Thermoplastic resin (A)]
Examples of the thermoplastic resin (A) include the following. Olefin resins such as polypropylene (PP) and polyethylene (PE); polystyrene (PS), high impact polystyrene (HIPS), (meth) acrylate / styrene copolymer (MS), styrene / acrylonitrile copolymer (SAN), Styrene / maleic anhydride copolymer (SMA), acrylonitrile / butadiene / styrene copolymer (ABS), acrylic ester / styrene / acrylonitrile copolymer (ASA), acrylonitrile / ethylene / propylene rubber / styrene copolymer (ASA) Styrene (St) resin such as AES); acrylic (Ac) resin such as polymethyl methacrylate (PMMA); polycarbonate resin (PC resin); polyamide (PA) resin; polyethylene terephthalate (PET), polybutylene PEs resins such as phthalate (PBT) and polylactic acid (PLA); (modified) polyphenylene ether ((m-) PPE) resin, polyoxymethylene (POM) resin, polysulfone (PSO) resin, polyarylate (PAr) resin Engineering plastics such as polyphenylene (PPS) resin and thermoplastic polyurethane (PU) resin; styrene elastomer, olefin elastomer, vinyl chloride elastomer, urethane elastomer, polyester elastomer, polyamide elastomer, fluorine elastomer, 1 , 2-polybutadiene, thermoplastic elastomer (TPE) such as trans 1,4-polyisoprene; alloy of PC resin such as PC / ABS and St resin, PVC resin such as PVC / ABS and St resin A (B) Alloys of PA resins such as PA / ABS and St resins, alloys of PA resins and TPE, alloys of PA resins such as PA / PP and polyolefin resins, PC resins such as PC / PBT and PEs resins Alloys between olefin resins such as polyolefin resins / TPE and PP / PE, alloys between PPE resins such as PPE / HIPS and PPE / PBT and PPE / PA, PVC such as PVC / PMMA, etc. Polymer alloys such as alloys of a resin and an Ac resin; PVC resins such as a hard vinyl chloride resin, a semi-rigid vinyl chloride resin, and a soft vinyl chloride resin.

  Among these, the thermoplastic resin (A) is a heat having at least one bond selected from a carbonate bond, an ester bond, and an amide bond from the viewpoint of improving the impact resistance and flame retardancy of the obtained molded product. A plastic resin is preferred. Examples of the thermoplastic resin having at least one bond selected from a carbonate bond, an ester bond, and an amide bond include a PC resin, PBT, PET, PA resin, and PLA. A resin called an alloy blend containing these resins may be used. Furthermore, a PC resin containing 50% by mass or more of an aromatic polycarbonate unit is particularly preferable.

  The PC-based resin is a thermoplastic aromatic polycarbonate polymer or copolymer that may have a branched chain, obtained by reacting an aromatic hydroxy compound or a small amount thereof with a diester of phosgene or carbonic acid. It is a coalescence. The production method of the aromatic polycarbonate resin is not particularly limited, and a known method, that is, a phosgene method (interfacial polymerization method), a melting method (transesterification method) or the like is employed. Since the amount of terminal OH groups tends to affect the thermal stability, hydrolysis stability, etc., the PC-based resin is manufactured by the melting method and adjusts the degree of pressure reduction during the reaction in the present invention. Accordingly, it is possible to use an aromatic polycarbonate resin in which the terminal OH group amount is adjusted.

  Examples of the PC resin include the following. Product names Iupilon S-1000, Iupilon S-2000, Iupilon S-3000, Iupilon H-3000 or Iupilon H-4000 manufactured by Mitsubishi Engineering Plastics Co., Ltd .; Light L1225 or Panlite K1300.

The amount of the graft copolymer (G _F ) used relative to the thermoplastic resin (A) is such that 0.1 to 12 parts by mass of the graft copolymer (G _F ) is added to 100 parts by mass of the thermoplastic resin (A). It is preferably 0.5 to 10 parts by mass, more preferably 1 to 8 parts by mass. If the usage-amount of a graft copolymer (G _F ) is 0.1-12 mass parts, the resin composition which can provide the molded object which was excellent in impact resistance and surface appearance can be obtained.

[Fluorine resin (C)]
The fluororesin (C) can be used for the purpose of preventing dripping during combustion. A well-known thing can be used as a fluorine-type resin (C), and what was synthesize | combined suitably may be used and a commercial item may be used. As a commercial item, the following are mentioned, for example. Polytetrafluoroethylene such as “Polyflon FA-500” (trade name, manufactured by Daikin Industries, Ltd.); SAN-modified polytetrafluoroethylene such as “BLENDEX B449” (trade name, manufactured by Galata Chemicals); Acrylic-modified polytetrafluoroethylene such as “3000”, “methabrene A-3750”, “methabrene A-3800” (trade name, manufactured by Mitsubishi Rayon Co., Ltd.). These fluororesins (C) may be used individually by 1 type, and may use 2 or more types together.

  Among these fluororesins (C), SAN-modified polytetrafluoroethylene, acrylic-modified polytetratetrafluoroethylene, acrylic-modified polytetrafluoroethylene (C) are excellent in dispersibility in the resulting molded product, and the molded product is excellent in mechanical properties, heat resistance, and flame retardancy. Fluoroethylene is preferred, and acrylic-modified polytetrafluoroethylene is more preferred.

  The content of polytetrafluoroethylene in the SAN-modified polytetrafluoroethylene or the acrylic-modified polytetrafluoroethylene is preferably 10 to 80% by mass in 100% by mass of the fluororesin (C), 20 More preferably, it is -70 mass%. When the content is 10% by mass or more, the obtained molded article is excellent in flame retardancy. Further, when the content is 80% by mass or less, the resulting molded article is excellent in appearance.

  The blending amount of the fluororesin (C) is preferably 0.01 to 5 parts by mass and more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the thermoplastic resin (A). More preferably, it is 0.3-2 mass parts. When the blending amount is 0.01 parts by mass or more, the obtained molded body is excellent in flame retardancy. Moreover, the original property of a thermoplastic resin (A) is not impaired as this compounding quantity is 5 mass parts or less.

[Flame Retardant (D)]
As a flame retardant (D), a well-known flame retardant can be used, for example, the following are mentioned. Halogen flame retardants comprising a combination of halogenated compounds such as halogenated bisphenol A, halogenated polycarbonate oligomers, brominated epoxy compounds, and flame retardant aids such as antimony oxide; organic salt flame retardants; phosphate ester flame retardants, Phosphorus flame retardants such as halogenated phosphoric acid ester flame retardants; sulfonic acid flame retardants such as metal salts of aromatic sulfonic acids and metal salts of perfluoroalkane sulfonic acids; branched phenyl silicone compounds and phenyl silicone resins Silicone flame retardants such as organopolysiloxanes.

  Among these flame retardants (D), since they are non-halogen-based and the obtained molded article is excellent in flame retardancy, phosphorus flame retardants such as phosphate ester flame retardants; metal salts of aromatic sulfonic acids, An organometallic salt flame retardant such as a metal salt of perfluoroalkanesulfonic acid is preferred, and an organometallic salt flame retardant is more preferred in terms of non-phosphorus.

  As a compounding quantity of a flame retardant (D), it is preferable that it is 0.01-10 mass parts with respect to 100 mass parts of thermoplastic resins (A), and it is more preferable that it is 0.1-10 mass parts. . When the blending amount is 0.01 parts by mass or more, the obtained molded body is excellent in flame retardancy. Moreover, the original property of a thermoplastic resin (A) is not impaired as this compounding quantity is 10 mass parts or less. When this compounding quantity is too small, the flame-retardant effect of the molded object obtained will fall. Moreover, when there are too many this compounding quantities, the mechanical strength of a resin molding will fall.

  Phosphorus flame retardants include red phosphorus, coated red phosphorus, polyphosphate compounds, phosphate ester compounds, phosphonate ester compounds, phosphite ester compounds, phosphinate ester compounds, phosphazene compounds Etc. Among these, phosphate ester compounds are preferable. Examples of phosphate ester compounds include the following. Trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, octyl diphenyl phosphate, isopropylphenyl diphosphate, tris (butoxyethyl) phosphate, trisisobutyl Phosphate, bis- (isopropylphenyl) diphenyl phosphate, tris- (isopropylphenyl) phosphate, 1,3 phenylene bis (diphenyl phosphate), 1,3 phenylene bis (di2,6 xylenyl phosphate), bisphenol A bis (Diphenyl phosphate), resorcinol bisdiphenyl phosphate, octyl diphe Ruphosphate, diethylene ethyl ester phosphate, dihydroxypropylene butyl ester phosphate, ethylene disodium ester phosphate, t-butylphenyl diphenyl phosphate, bis- (t-butylphenyl) phenyl phosphate, tris- (t-butylphenyl) Phosphate, tris (chloroethyl) phosphate, tris (dichloropropyl) phosphate, tris (chloropropyl) phosphate, bis (2,3-dibromopropyl) -2,3-dichloropropyl phosphate and the like. These may be used alone or in combination of two or more.

  As a compounding quantity of a phosphorus flame retardant, it is preferable that it is 1-10 mass parts with respect to 100 mass parts of thermoplastic resins (A), More preferably, it is 2-8 mass parts, More preferably, it is 3-6 masses. Within the range of the part.

  Since the organometallic salt flame retardant exhibits a flame retardant effect when added in a very small amount, it is advantageous in that it is difficult to lower the heat resistance of the molded body and at the same time imparts an antistatic property to the molded body. The organometallic salt flame retardant most advantageously used in the present invention is a fluorine-containing organometallic salt compound. The fluorine-containing organometallic salt compound refers to a metal salt compound composed of an anion component composed of an organic acid having a fluorine-substituted hydrocarbon group and a cation component composed of a metal ion. Of these, metal salts of fluorine-substituted organic sulfonic acids, metal salts of fluorine-substituted organic sulfates, and metal salts of fluorine-substituted organic phosphates are preferred. A fluorine-containing organometallic salt compound may be used individually by 1 type, and may use 2 or more types together. Among these, a metal salt of a fluorine-substituted organic sulfonic acid is preferable, and a metal salt of a sulfonic acid having a perfluoroalkyl group is particularly preferable.

  In addition, as an organic metal salt flame retardant other than the above-mentioned fluorine-containing organic metal salt compound, a metal salt of an organic sulfonic acid not containing a fluorine atom is suitable. Examples of the metal salt include aliphatic sulfonic acid metal salts and aromatic sulfonic acid metal salts. Of these, metal salts of aromatic sulfonic acids are preferred.

  Examples of the metal species constituting the metal ions of the organic metal salt flame retardant include alkali metals such as sodium and potassium, and alkaline earth metals such as calcium. Specific examples of the organic metal salt flame retardant include the following. 4-methyl-N- (4-methylphenyl) sulfonyl-benzenesulfonamide potassium salt, potassium diphenylsulfone-3-sulfonate, potassium diphenylsulfone-3,3′-disulfonate, sodium paratoluenesulfonate, perfluoro Sodium butanesulfonate, potassium perfluorobutanesulfonate, sodium perfluoromethylbutanesulfonate, potassium perfluoromethylbutanesulfonate, sodium perfluorooctanesulfonate, potassium perfluorooctanesulfonate, tetraethyl perfluorobutanesulfonate Ammonium salts and the like. Among these, potassium perfluorobutane sulfonate is preferable. These may be used alone or in combination of two or more.

  As a compounding quantity of an organometallic salt type flame retardant, it is preferable that it is 0.01-2 mass parts with respect to 100 mass parts of thermoplastic resins (A), More preferably, it is 0.03-1 mass parts, Furthermore, Preferably it exists in the range of 0.05-0.5 mass part.

[Antioxidant (E)]
The thermoplastic resin composition of the first invention group can contain an antioxidant (E) as necessary. The antioxidant (E) is a component not only for the purpose of suppressing the oxidative decomposition of the resin during the production of the molded body, but also for improving the flame retardancy of the molded body. Antioxidant (E) will not be specifically limited if it is used at the time of normal shaping | molding. Specific examples include the following. Tris [N- (3,5-di-t-butyl-4-hydroxybenzyl)] isocyanurate (manufactured by ADEKA, ADK STAB AO-20, etc.), tetrakis [3- (3,5-di-t- (Butyl-4-hydroxyphenyl) propionyloxymethyl] methane (BASF, Irganox 1010, etc.), bis (3-tert-butyl-4-hydroxy-5-methylbenzenepropanoic acid) ethylenebis (oxyethylene) (BASF , Irganox 245), octadecyl 3,5-di-tert-butyl-4-hydroxybenzenepropionate (BASF, Irganox 1076, etc.), butylidene-1,1-bis- (2-methyl-) 4-hydroxy-5-t-butyl-phenyl (manufactured by ADEKA, Adeka Stub AO-) 0, etc.), 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane (Yoshino Fine Chemical Co., Ltd., Yoshinox 930, etc.); 2,6, di-t-butyl-4-methylphenyl) pentaerythritol phosphite (manufactured by ADEKA, ADK STAB PEP-36, etc.), tris (2,4-di-t-butylphenyl) phosphite (( Phosphoric antioxidants such as ADEKA Corporation, Adeka Stub 2112), 2,2-methylenebis (4,6-di-t-butylphenyl) octyl phosphite (Adeka Corporation, Adeka Stub HP-10, etc.) Dilauryl 3,3'-thio-dipropionate (Yoshino Fine Chemical Co., Ltd., Yoshinox DLTP), dimyris Le 3,3'-thio - dipropionate (Yoshitomi Fine Chemical Co., Ltd., Yoshinox DMTP) sulfur-based antioxidants such like.

  As a compounding quantity of antioxidant (E), it is preferable that it is 0-2 mass parts with respect to 100 mass parts of thermoplastic resins (A), It is more preferable that it is 0.01-1 mass part, 0 More preferably, it is 0.05-0.8 mass part. The fall of the impact resistance of a molded object can be suppressed by making a compounding quantity into 2 mass parts or less.

[Other additives]
In the thermoplastic resin composition of the first invention group, the following components can be further blended as necessary. Plasticizers, lubricants; mold release agents (eg, pentaerythritol tetrastearate); nucleating agents, antistatic agents, stabilizers, fillers; reinforcing materials (eg, glass fibers, carbon fibers, mica, kaolin, talc, CaCO ₃ and glass flakes); dyes and pigments. These may be used alone or in combination of two or more.

[Method for preparing resin composition]
The method for preparing the thermoplastic resin composition of the first invention group is not particularly limited. For example, a thermoplastic resin (A), a graft copolymer (G _F ) and, if necessary, a fluorine-based resin (C), a flame retardant (D), an antioxidant (E), various additives, V It can be prepared by mixing and dispersing with a mold blender or Henschel mixer, and melt-kneading the mixture using a kneader such as an extruder, a Banbury mixer, a pressure kneader, or a roll. These components can be mixed batchwise or continuously, and the mixing order of the components is not particularly limited. The melt-kneaded product can be made into pellets and used for various moldings.

<Molded body>
As a molding method of the thermoplastic resin composition of the first invention group, a molding method used for molding a normal thermoplastic resin composition, for example, an injection molding method, an extrusion molding method, a blow molding method, a calendar molding method, etc. Is mentioned.

  Since the molded products of the first invention group have excellent impact resistance, flame retardancy, and color developability, they are widely used industrially as various materials in the fields of automobiles, OA equipment, home appliances, electrical / electronics, etc. Can be used. More specifically, it can be used as an electronic device part, an automobile structural member, an automobile interior part, and a light reflector. More specifically, it can be used as an interior / exterior member of a personal computer casing, a mobile phone casing, a portable information terminal casing, a portable game machine casing, a printer, a copying machine, and the like.

<Slidability improver>
The “slidability improving agent (H)” of the second invention group is composed of a powder of the graft copolymer (G _S ). This graft copolymer (G _S ) has a polyorganosiloxane content limited to a specific range, and the graft copolymer (G _S ) latex has a mass-average particle diameter limited to a specific range. Therefore, it is optimized as a sliding property improving agent. Therefore, the effect of improving slidability is great, and the color balance (pigment colorability), molded appearance, and impact strength are excellent. The rubber containing polyorganosiloxane used for the production of the graft copolymer (G _S ) is preferably a composite rubber containing polyorganosiloxane and polyalkyl acrylate.

<Thermoplastic resin composition for sliding member>
The slidability improving agent (H) of the second invention group can be mixed with the thermoplastic resin (K) and used as a thermoplastic resin composition for sliding members.

[Thermoplastic resin (K)]
Examples of the thermoplastic resin (K) include the same as the thermoplastic resin (A).

  Among these, the following resins or alloys are preferable. St resin, PC resin, PA resin, PET resin, PBT resin, (m-) PPE resin, POM resin, PU resin; Alloy of PC resin such as PC / ABS and St resin, PA / ABS, etc. Alloy of PA resin and St resin, Alloy of PA resin and TPE, Alloy of PA resin such as PA / PP and polyolefin resin, Alloy of PC resin such as PC / PBT and PEs resin, PPE / Alloys between PPE resins such as PBT and PPE / PA. Among these, it is more preferable that the thermoplastic resin (K) is a PC-based resin because the effects of the present invention are particularly exhibited. These resins may be used alone or in combination of two or more.

  Examples of the PC resin include a polymer obtained by reacting an aromatic dihydroxy compound or a small amount thereof with phosgene or a carbonic acid diester. The PC resin may be linear or branched. The polycarbonate resin may be either a homopolymer or a copolymer.

  Examples of the aromatic dihydroxy compound include 2,2-bis (4-hydroxyphenyl) propane (that is, bisphenol A), tetramethylbisphenol A, bis (4-hydroxyphenyl) -p-diisopropylbenzene, hydroquinone, resorcinol, and the like. 4,4-dihydroxydiphenyl is mentioned. These may be used alone or in combination of two or more. A compound in which one or more tetraalkylphosphonium sulfonates are bonded can also be used as the aromatic dihydroxy compound.

  In order to obtain a branched PC resin as the PC resin, a part of the aromatic dihydroxy compound described above may be substituted with a branching agent. Examples of the branching agent include the following. Phloroglucin, 4,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) heptene-2, 4,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) heptane, 2,6- Such as dimethyl-2,4,6-tri (4-hydroxyphenyl) heptene-3, 1,3,5-tri (4-hydroxyphenyl) benzene, 1,1,1-tri (4-hydroxyphenyl) ethane, etc. Polyhydroxy compounds; 3,3-bis (4-hydroxyaryl) oxindole (ie isatin bisphenol), 5-chloroisatin, 5,7-dichloroisatin and 5-bromoisatin. The usage-amount of a branching agent is 0.01-10 mol% normally with respect to an aromatic dihydroxy compound, Preferably it is 0.1-2 mol%.

  The PC resin is preferably a PC resin obtained from an aromatic dihydroxy compound containing bisphenol A in terms of heat resistance and flexibility. Further, as the PC resin, a copolymer mainly composed of a PC resin such as a copolymer of a polycarbonate and a polymer having a siloxane structure or an oligomer can be used. PC type resin may be used individually by 1 type, and may use 2 or more types together.

  The viscosity average molecular weight of the PC resin is preferably 16,000 to 30,000, more preferably 18,000 to 28,000. The viscosity average molecular weight of the PC resin is a value converted from the solution viscosity measured at a temperature of 25 ° C. using methylene chloride as a solvent. When the viscosity average molecular weight is 30,000 or less, the melt fluidity of the resin composition containing the slidability improving agent tends to be good, and when the viscosity average molecular weight is 16,000 or more, The impact resistance tends to be good.

  In order to adjust the molecular weight of the PC resin, for example, a part of the above-mentioned aromatic dihydroxy compound is mixed with m-methylphenol, p-methylphenol, m-propylphenol, p-propylphenol, p-tert-butylphenol, p -A monovalent aromatic hydroxy compound such as a long-chain alkyl-substituted phenol may be substituted.

  It does not specifically limit as a manufacturing method of PC type resin, It can manufacture by the well-known phosgene method (interfacial polymerization method) and a melting method (transesterification method). Moreover, it is also possible to use an aromatic polycarbonate resin produced by a melting method and having a terminal OH group amount adjusted by adjusting the degree of pressure reduction during the reaction.

[Thermoplastic resin composition]
The thermoplastic resin composition containing the slidability improving agent of the second invention group contains the above-described slidability improving agent (H) and thermoplastic resin (K). In this thermoplastic resin composition, the content of the slidability improver (H) is preferably 4 to 16% by mass, and the content of the thermoplastic resin (K) is preferably 96 to 84% by mass. If the content of the slidability improver (H) is 4% by mass or more, the effect of improving the slidability of the sliding member is sufficient, and if the content is 16% by mass or less, the coloring property of the sliding member (pigment) Colorability) and molded appearance are good.

  In this thermoplastic resin composition, the content of the slidability improver (H) is 5.1 to 16% by mass, and the content of the thermoplastic resin (K) is 94.9 to 84% by mass. Is more preferable. In this thermoplastic resin composition, the content of the slidability improver (H) is preferably 7 to 15% by mass, and the content of the thermoplastic resin (K) is particularly preferably 93 to 85% by mass.

  The resin composition may contain, for example, the following components within a range not impairing the original purpose. Reinforcing agents and fillers such as glass fiber, metal fiber, metal flake and carbon fiber; 2,6-di-butyl-4-methylphenol, 4,4'-butylidene-bis (3-methyl-6-t-butylphenol Phenolic antioxidants such as tris (mixed, mono and dinylphenyl) phosphite, diphenyl isodecyl phosphite, etc .; dilauryl thiodipropionate, dimyristyl thiodipropionate di Sulfur-based antioxidants such as asterial thiodipropionate; benzotriazole-based UV absorbers such as 2-hydroxy-4-octoxybenzophenone and 2- (2-hydroxy-5-methylphenyl) benzotriazole; bis (2, 2,6,6) -tetramethyl-4-piperidinyl) and other light stabilizers; Antistatic agents such as roxylalkylamine and sulfonate; lubricants such as ethylenebisstearylamide and metal soap; and tetrabromophenol A, decabromophenol oxide, TBA epoxy oligomer, TBA polycarbonate oligomer, antimony trioxide, TPP, Flame retardants such as phosphate esters; modified tetrafluoroethylene (hereinafter sometimes abbreviated as “PTFE”), a modified fluororesin obtained by mixing a fluoropolymer with a hard polymer obtained by polymerizing a vinyl monomer Anti-drip agents such as (for example, PTFE modified with a vinyl polymer or the like).

[Method for preparing resin composition]
The method for producing the thermoplastic resin composition of the second invention group is not particularly limited, but a melt mixing method is preferably used. Moreover, you may use a small amount of solvent as needed.

  Specifically, a predetermined amount of the slidability improving agent (H) and the thermoplastic resin (K), which are essential components, and optional components are blended as desired, and first mixed with, for example, a Henschel mixer or a tumbler. Subsequently, it can prepare by knead | mixing the obtained mixture with normal kneading machines, such as a roll, a Banbury mixer, a single screw extruder, and a twin screw extruder. These can be operated batchwise or continuously, and the mixing order of each component is not particularly limited.

  The thermoplastic resin composition of the present invention is preferably in the form of pellets.

<Molded body>
As a molding method of the thermoplastic resin composition of the second invention group, a molding method used for molding a normal thermoplastic resin composition, for example, an injection molding method, an extrusion molding method, a blow molding method, a calendar molding method, etc. Is mentioned.

Since the thermoplastic resin composition of the second invention group contains the graft copolymer (G _S ), the balance of slidability, color developability (pigment colorability), impact resistance, and molded appearance is excellent. . There is no restriction | limiting in particular as a use of this thermoplastic resin composition, For example, it can utilize for various materials, such as miscellaneous goods, such as a motor vehicle field, OA equipment field, a household appliance, an electric / electronic field, building materials, a toy, and a stationery. In particular, since it has an excellent balance of slidability, color development, and impact strength, it can be used as a sliding member for the following products, for example. Parts for automobiles, OA equipment, electrical / electronic equipment products, especially bearings for office machines and power equipment, gears, switch parts, camera module parts, sliding screws, gears, cams, pulleys, reels, bushes, spacers, rollers, bearings , Bearing retainers, tape guides for audio tape recorders, end faces of mechanical seals, valve seats, V-rings, rod packings, piston rings, rotary shafts and sleeves of compressors, pistons, impellers, vanes, rotors, guide rails, etc. .

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. Examples 1 to 14 and Comparative Examples 1 to 17 relate to the first invention group. Examples 21-29 and Comparative Examples 21-27 relate to the second invention group.

  Prior to Examples, various evaluation methods, Production Examples 1 to 3, 5, and 6 of polyorganosiloxane rubber latex and Production Example 4 of polytetrafluoroethylene-containing powder will be described. In the following description, “parts” and “%” mean “parts by mass” and “% by mass” unless otherwise specified.

  The test pieces for each evaluation relating to the first invention group were obtained by using a resin composition (or its pellets) with a 100t injection molding machine (SE-100DU manufactured by Sumitomo Heavy Industries, Ltd.), a cylinder temperature of 310 ° C., and a mold temperature of 90 ° C. Molding was performed under the condition of ° C.

  The test pieces for each evaluation relating to the second invention group were obtained by using a resin composition (or its pellets) with a 100t injection molding machine (SE-100DU manufactured by Sumitomo Heavy Industries, Ltd.), a cylinder temperature of 280 ° C., and a mold temperature of 80 Molding was performed under the condition of ° C.

<1. Evaluation method>
(1) Graft rate Graft rate [%] was calculated by the above formula (1) based on the experimentally determined acetone insoluble content wa and the rubber fraction R in the charged raw material.

(2) Solid content A latex of polyorganosiloxane rubber having a mass of w ₁ is dried with a hot air dryer at 180 ° C. for 30 minutes, the mass w ₂ of the residue after drying is measured, and the solid content [%] is calculated by the following formula. did.

Solid content [%] = w ₂ / w ₁ × 100 (2).

(3) Mass average particle size and particle size distribution (Dw / Dn)
Using a “polyorganosiloxane rubber latex” or “graft copolymer latex” diluted with deionized water to a concentration of about 3%, a latex mass average using a CHDF2000 type particle size distribution meter manufactured by MATEC USA Particle diameter Dw and particle diameter distribution (Dw / Dn) were measured.

The measurement was performed under the following standard conditions recommended by MATEC.
Cartridge: Capillary type cartridge for particle separation (trade name; C-202),
Carrier liquid: dedicated carrier liquid (trade name: 2XGR500),
Carrier liquid: almost neutral,
Carrier liquid flow rate: 1.4 ml / min,
Carrier liquid pressure: about 4,000 psi (2,600 kPa),
Measurement temperature: 35 ° C
Sample usage: 0.1 ml.

  As the standard particle size substance, 12 types of particles having a particle size of 40 to 800 nm in a monodisperse polystyrene having a known particle size manufactured by DUKE, USA were used.

(4) Acetone soluble matter 1 g of the graft copolymer powder was dissolved in 50 g of acetone, and the dispersion obtained by refluxing and extracting at 70 ° C. for 6 hours was separated into a centrifugal separator (Hitachi, Ltd.). CRG SERIES (trade name)) was used and centrifuged at 14,000 rpm for 30 minutes at 4 ° C. The separated acetone-soluble component was removed by decantation to obtain an acetone-insoluble component.

The obtained acetone-insoluble matter was dried at 50 ° C. for 24 hours in a vacuum dryer, and the mass w ₃ of acetone-insoluble matter was measured. The acetone-soluble matter [%] in the graft copolymer powder was determined as follows. Calculated by the formula.

Acetone-soluble content [%] = (1-w ₃ ) × 100 (3).

(5) Volume average particle diameter The volume average particle diameter of the graft copolymer was measured by the following method.
The latex of the graft copolymer was diluted with deionized water, and the median diameter in volume average was determined using a laser diffraction scattering particle size distribution analyzer (SALD-7100, manufactured by Shimadzu Corporation). The latex sample concentration was appropriately adjusted so as to be within an appropriate range in the scattered light intensity monitor attached to the apparatus. As the standard particle size substance, 12 types of particles having monodisperse polystyrene with a known particle size and having a particle size in the range of 20 to 800 nm were used.

(6) Charpy impact strength Charpy impact strength of test piece (length 80.0 mm, width 10.0 mm, thickness 4 mm, with V notch) at temperatures of 23 ° C. and −30 ° C. in accordance with JIS K 7111 Was measured.

(7) Total light transmittance Based on JIS K 7375, using Nippon Denshoku Industries Co., Ltd. HAZE Meter NDH4000, about a test piece (length 100mm, width 50mm, thickness 2mm), all the light rays in D65 light source The transmittance was measured.

(8) Color development (pigment coloring)
L * of a test piece (length 100 mm, width 50 mm, thickness 2 mm) was measured according to JIS Z 8729 (L * a * b * object color display method by color system). Tristimulus values (XYZ) were measured using a spectroscopic color difference meter SE-2000 manufactured by Nippon Denshoku Industries Co., Ltd. under the following measurement conditions in accordance with JISZ8722. The L * value was then calculated using the CIE color difference formula.
Apparatus: spectroscopic color difference meter SE-2000 (manufactured by Nippon Denshoku Industries Co., Ltd., 0-45 ° spectroscopic system),
Measurement range: 380 to 780 nm,
Measurement light source: C light (2 ° field of view).

(9) Flame retardancy A UL-94V test was conducted on a 1/16 inch test piece (127 mm long, 12.7 mm wide, 1.6 mm thick).

(10) Appearance (visual evaluation)
A flat plate of a test piece (length 100.0 mm, width 50.0 mm, thickness 2 mm) is molded, and visual evaluation of flow marks near the gate (patterns seen in the vicinity of the gate of the molded body) and surface roughness are visually observed. Observed and evaluated according to the following criteria.
++: No flow mark or rough surface is seen.
+: Flow marks and surface roughness are somewhat visible but not noticeable.
−: Flow marks and surface roughness are slightly noticeable.
-: Flow marks and surface roughness are conspicuous.

(11) Appearance (arithmetic mean roughness Ra of the surface of the molded body)
A test piece (length: 100.0 mm, width: 50.0 mm, thickness: 2 mm) is molded, and as shown in FIG. 1, at the point A (near the gate) and point B (center), contact type surface Using a roughness meter (Surfcom 1400D, manufactured by Tokyo Seimitsu Kogyo Co., Ltd.), the surface roughness of the flat plate was measured at a driving speed of 0.3 mm / sec using a 1 μm R, 55 ° conical diamond needle (010-2528). did. The measurement length was 4 mm, the cutoff wavelength was 0.8 mm, and the cutoff type was Gaussian. After correcting the slope of the average line of the extracted curve by the least square line, the arithmetic average roughness (Ra) was measured by a method based on JIS B0601-2001, and used as an index of the smoothness of the surface of the molded body. .

(12) Sliding property A flat plate of a test piece (length 100 mm, width 50 mm, thickness 2 mm) is formed, and using a pin plate type friction tester (manufactured by Toyo Seiki Seisakusho Co., Ltd.), mounting load W [N] The frictional force F [N] was measured at 30 N, the moving distance: 20 mm, the moving speed: 2 mm / s, the measurement temperature: 23 ° C., and the “dynamic friction coefficient” was measured by the following equation.

  Coefficient of dynamic friction [−] = F [N] / W [N] (4).

(13) Chemical resistance A test piece (127 mm in length, 12.7 mm in width, 1.5 mm in thickness) is molded, and an evaluation chemical is applied to the test piece at 23 ° C. by the 1/4 ellipse method, and the test piece is allowed to stand for 48 hours. Then, the “critical strain (%)” was obtained from the following equation from the positions of cracks and cracks on the test piece. As a chemical for evaluation, Kao Corporation Mypet, which is a weak alkaline detergent, was used.

  “Critical strain (%)” is the lowest strain that is affected by a chemical when the molded product comes into contact with the chemical under a certain strain. The higher the “critical strain (%)” figure, the better the chemical resistance.

A: Long axis (12 cm) of jig,
B: The short axis of the jig (4 cm),
t: thickness of the test piece (0.15 cm),
X: Distance in the long axis direction from the end point of the crack to the center of the ellipse [cm].

(14) Blackness A test piece (length 100 mm, width 50 mm, thickness 2 mm) was visually observed and judged according to the following criteria.
○: Black,
X: Gray.

<Production example>
[Production Example 1] Production of latex (S-1) of polyorganosiloxane rubber:
2 parts of tetraethoxysilane (TEOS), 2 parts of γ-methacryloyloxypropyldimethoxymethylsilane (DSMA), and 96 parts of octamethylcyclotetrasiloxane (product name: TSF404) manufactured by Momentive Performance Materials Japan Co., Ltd. Were mixed to obtain 100 parts of an organosiloxane mixture. An aqueous solution in which 1 part of sodium dodecylbenzenesulfonate (DBSNa) is dissolved in 150 parts of deionized water is added to the mixture, stirred at 10,000 rpm for 5 minutes with a homomixer, and then applied to a homogenizer at a pressure of 20 MPa. Passed twice to obtain a stable premixed emulsion.

  The emulsion was then placed in a separable flask having a capacity of 5 liters equipped with a cooling condenser, and then the emulsion was heated to a temperature of 80 ° C. Then, 0.20 parts of sulfuric acid and 49.8 parts of deionized water were added. The mixture was continuously charged over 3 minutes. The polymerization reaction was carried out while maintaining the temperature heated to 80 ° C. for 6 hours, and then cooled to room temperature (25 ° C.), and the resulting reaction solution was kept at room temperature for 6 hours. Thereafter, a 5% aqueous sodium hydroxide solution was added to neutralize the reaction solution to pH 7.0 to obtain a polyorganosiloxane rubber latex (S-1). The evaluation results of this latex are shown in Table 1.

[Production Example 2] Production of polyorganosiloxane rubber latex (S-2):
2 parts of TEOS, 0.5 part of DSMA, and 97.5 parts of cyclic organosiloxane mixture (manufactured by Shin-Etsu Silicone Co., Ltd., product name: DMC, mixture of 3-6 membered cyclic organosiloxane) 100 parts of an organosiloxane mixture were obtained. An aqueous solution prepared by dissolving 0.68 parts each of sodium dodecylbenzenesulfonate (DBSNa) and dodecylbenzenesulfonate (DBSH) in 200 parts of deionized water was added to the mixture, and the mixture was added at 10,000 rpm with a homomixer. After stirring for a minute, the mixture was passed twice through a homogenizer at a pressure of 20 MPa to obtain a stable premixed emulsion.

  Next, the emulsion was put in a separable flask having a capacity of 5 liters equipped with a cooling condenser, and then the emulsion was heated to a temperature of 85 ° C., and this temperature was maintained for 6 hours, followed by a polymerization reaction. 25 ° C.) and the resulting reaction was kept at room temperature for 12 hours. Thereafter, a 5% aqueous sodium hydroxide solution was added to neutralize the reaction solution to pH 7.0 to obtain a polyorganosiloxane rubber latex (S-2). The evaluation results of this latex are shown in Table 1.

[Production Example 3] Production of latex (S-3) of polyorganosiloxane rubber:
2 parts of TEOS, 0.5 part of DSMA and 97.5 parts of TSF404 were mixed to obtain 100 parts of an organosiloxane mixture. An aqueous solution in which 1 part of DBSNa is dissolved in 170 parts of deionized water is added to the above mixture, stirred for 5 minutes at 10,000 rpm with a homomixer, and then passed twice through a homogenizer at a pressure of 20 MPa to obtain a stable preparatory solution. A mixed emulsion was obtained.

  The emulsion was then placed in a 5 liter separable flask equipped with a cooling condenser, and then the emulsion was heated to a temperature of 80 ° C., and then 0.20 parts of sulfuric acid and 14.7 parts of deionized water. The mixture was continuously charged over 3 minutes. The polymerization reaction was carried out while maintaining the temperature heated to 80 ° C. for 6 hours, and then cooled to room temperature (25 ° C.), and the resulting reaction solution was kept at room temperature for 6 hours. Thereafter, a 5% aqueous sodium hydroxide solution was added to neutralize the reaction solution to pH 7.0 to obtain a polyorganosiloxane rubber latex (S-3). The evaluation results of this latex are shown in Table 1.

[Production Example 4] Production of polytetrafluoroethylene-containing powder (J-1):
6.0 parts of dipotassium alkenyl succinate as an emulsifier and 230 parts of deionized water were charged into a separable flask having a capacity of 2 liters equipped with a stirring blade, a condenser, a thermocouple, and a nitrogen inlet, at room temperature under a nitrogen stream. For 30 minutes. Note that the dipotassium alkenyl succinate was used in a state of being previously dissolved in a part of the deionized water.

  Next, the temperature of the liquid in the flask was raised to 70 ° C., and an aqueous solution in which 0.2 part of potassium persulfate was dissolved in 3 parts of deionized water was added to the flask. Further, a mixture comprising 50 parts of methyl methacrylate (MMA), 30 parts of styrene (St), 20 parts of n-butyl acrylate (n-BA) and 0.1 part of n-octyl mercaptan was dropped into the flask over 4 hours. Then, radical polymerization was performed. After completion of the dropping, the liquid in the flask was stirred for 1 hour while maintaining the temperature at 70 ° C. to obtain a latex (p2-1) containing a vinyl polymer (p2). The content of the vinyl polymer (p2) in this latex was 30%.

  “Fullon AD939E” (Asahi Glass Co., Ltd.), which is a latex containing 166.7 parts of the latex (p2-1) and the PTFE polymer (p1) in a 5 liter reactor equipped with a stirrer Made, PTFE concentration 60%, PTFE mass average molecular weight about 15 million, polyoxyalkylene alkyl ether concentration 3%) 83.3 parts were charged and stirred for 5 minutes to obtain latex (j-1). The latex contained 50 parts of PTFE, 2.5 parts of polyoxyalkylene alkyl ether, and 50 parts of the vinyl polymer (p2).

  Next, 325 parts of an aqueous calcium acetate solution containing 5.0 parts of calcium acetate as a coagulant was charged into a 10-liter flask. The aqueous solution was heated to a temperature of 80 ° C., and while stirring, the latex (j-1) was gradually dropped into the aqueous solution to coagulate the polymer to obtain a slurry. Thereafter, the temperature of the slurry was raised to 90 ° C., and stirring was continued for 5 minutes. Next, the obtained precipitate was separated from the slurry, filtered, washed with water, and dried to obtain 100 parts of polytetrafluoroethylene-containing powder (J-1).

[Production Example 5] Production of polyorganosiloxane latex (S-4):
2 parts of tetraethoxysilane (TEOS), 0.5 part of γ-methacryloyloxypropyldimethoxymethylsilane (DSMA) and octamethylcyclotetrasiloxane (made by Momentive Performance Materials Japan G.K., product name: TSF-404) ) 97.5 parts were mixed to obtain 100 parts of a siloxane-based mixture. To this was added 150 parts of deionized water in which 1.0 part of sodium dodecylbenzenesulfonate (DBSNa) was dissolved, and the mixture was stirred for 5 minutes at 10000 rpm with a homomixer, and then passed twice through the homogenizer at a pressure of 20 MPa. A premixed organosiloxane emulsion was obtained.

  The above emulsion was placed in a separable flask having a capacity of 5 liters equipped with a cooling condenser, and a mixture of 0.20 parts of sulfuric acid and 49.8 parts of deionized water was added over 3 minutes. This aqueous solution was maintained at 80 ° C. for 7 hours and cooled to room temperature (25 ° C.). Subsequently, this reaction product was kept at room temperature for 6 hours, and then neutralized to pH 7.0 using a 10% aqueous sodium hydroxide solution to obtain a polyorganosiloxane latex (S-4). The evaluation results of this latex are shown in Table 1.

[Production Example 6] Production of polyorganosiloxane latex (S-5):
2 parts of TEOS, 0.5 part of DSMA and 97.5 parts of cyclic organosiloxane mixture (manufactured by Shin-Etsu Chemical Co., Ltd., product name: DMC) were mixed to obtain 100 parts of an organosiloxane mixture. To this was added 300 parts of deionized water in which 0.68 parts of DBSNa was dissolved, and the mixture was stirred at 10,000 rpm for 2 minutes with a homomixer and then passed twice through a homogenizer at a pressure of 20 MPa to obtain a stable premixed emulsion. It was. On the other hand, 10 parts of dodecylbenzenesulfonic acid (DBSH) and 90 parts of deionized water were poured into a separable flask having a capacity of 5 liters equipped with a cooling condenser to prepare an aqueous solution.

  The premixed emulsion was dropped into this aqueous solution heated to 90 ° C. over 4 hours, and the temperature was maintained for 2 hours after completion of the dropping, and cooled to room temperature (25 ° C.). The reaction product was then maintained at room temperature for 12 hours and then neutralized to pH 7.0 using a 10% aqueous sodium hydroxide solution to obtain a polyorganosiloxane latex (S-5). The evaluation results of this latex are shown in Table 1.

[Example 1]
The polyorganosiloxane rubber latex (S-1) obtained in Production Example 1 was collected in a 79.7 part, 5 liter separable flask in terms of polymer, and 46 parts of deionized water was added and mixed. Next, a mixture of 10.0 parts of n-butyl acrylate (n-BA), 0.3 parts of allyl methacrylate (AMA) and 0.04 parts of cumene hydroperoxide (CHP) was added into the separable flask.

  The atmosphere in the flask was replaced with nitrogen by passing a nitrogen stream through the separable flask, and the liquid temperature was raised to 50 ° C. When the liquid temperature reached 50 ° C., 0.001 part of ferrous sulfate (Fe), 0.003 part of ethylenediaminetetraacetic acid disodium salt (EDTA), and 0.18 part of sodium formaldehyde sulfoxylate (SFS) were removed. An aqueous solution dissolved in 4.2 parts of ionic water was added to initiate radical polymerization. In order to complete the polymerization of the acrylate component, a liquid temperature of 70 ° C. was maintained for 1 hour to obtain a composite rubber latex of polyorganosiloxane and poly n-butyl acrylate.

  In a state where the temperature of the latex of the composite rubber is maintained at 70 ° C., 9.5 parts of MMA, 0.5 part of n-BA, and 0.03 part of tert-butyl hydroperoxide (t-BH) are mixed. The liquid was polymerized dropwise into the latex over 1.0 hour. After completion of dropping, the liquid temperature was maintained at 70 ° C. for 1 hour and then cooled to 25 ° C. to obtain a latex of polyorganosiloxane-containing graft copolymer (G-1). Table 2 shows the volume average particle diameter of the graft copolymer (G-1).

  Next, 500 parts of an aqueous solution having a calcium acetate concentration of 1% by mass is maintained at a temperature of 40 ° C., and while stirring, 300 parts of the latex of the graft copolymer (G-1) is gradually dropped into the solution and solidified. did. The obtained graft copolymer was filtered and dehydrated. Furthermore, after adding 10 times the amount of water to 100 parts of the graft copolymer, the mixture was washed for 10 minutes in a flask equipped with a stirrer, filtered and dehydrated. This operation was repeated twice, followed by drying to obtain a graft copolymer (G-1) powder. Table 2 shows the graft ratio and volume average particle diameter of the graft copolymer (G-1).

[Examples 2 and 3, Comparative Examples 1 to 3 and 5]
A polyorganosiloxane-containing graft copolymer (G-2, G-3, G) was prepared in the same manner as in Example 1 except that the types and amounts of the respective raw materials used in Example 1 were changed to the conditions shown in Table 2. '-1, G'-2, G'-3, and G'-5) were produced, and the powder was obtained. Table 2 shows the graft ratio and volume average particle diameter of the obtained graft copolymers.

[Example 4]
The polyorganosiloxane rubber latex (S-1) obtained in Production Example 1 was collected in a separable flask having a volume of 5 liters and 90 parts in terms of polymer, and 46 parts of deionized water was added and mixed. A mixture of 0.5 parts AMA and 0.07 parts CHP was then added to the separable flask. The atmosphere in the flask was replaced with nitrogen by passing a nitrogen stream through the separable flask, and the liquid temperature was raised to 50 ° C. An aqueous solution in which 0.001 part of ferrous sulfate (Fe), 0.003 part of EDTA, 0.18 part of SFS, and 4.2 part of deionized water are dissolved when the liquid temperature reaches 50 ° C. Was added to initiate radical polymerization. In order to complete the polymerization of the allyl methacrylate component, the liquid temperature of 70 ° C. was maintained for 1 hour. In this way, the first stage graft polymerization was performed. Then, 9 parts of MMA, 0.5 part of n-BA, and 0.1 part of CHP were added dropwise over 1.0 hour for polymerization. In this way, the second stage graft polymerization was performed. Subsequently, after maintaining the liquid temperature of 70 degreeC for 1 hour, it cooled to 25 degreeC and obtained latex of the polyorganosiloxane containing graft copolymer (G-4). Table 2 shows the graft ratio and volume average particle diameter of the graft copolymer (G-4). Thereafter, in the same manner as in Example 1, a powder of the graft copolymer (G-4) was obtained.

[Example 5]
A polyorganosiloxane-containing graft copolymer (G-5) was produced in the same manner as in Example 4 except that the type and amount of each raw material used in Example 4 were changed to the conditions shown in Table 2, and further The powder was obtained. Table 2 shows the graft ratio and volume average particle diameter of the obtained graft copolymer.

[Comparative Example 4]
A latex of a composite rubber of polyorganosiloxane and n-butyl acrylate was obtained in the same manner as in Example 1 except that the type and amount of each raw material used in Example 1 were changed to the conditions shown in Table 2.

  While maintaining the latex temperature of the composite rubber at 65 ° C., a mixture of 5.0 parts AMA and 0.3 parts CHP was charged for polymerization. In this way, the first stage graft polymerization was performed. After the addition, the liquid temperature was maintained at 65 ° C. for 1 hour, and then a mixed liquid of 15.0 parts of phenyl methacrylate (PhMA) and 0.2 part of CHP was dropped over 10 minutes for polymerization. In this way, the second stage graft polymerization was performed. Subsequently, after maintaining the state of liquid temperature of 65 degreeC for 1 hour, it cooled to 25 degreeC and obtained latex of the polyorganosiloxane containing graft copolymer (G'-4). Table 2 shows the graft ratio and volume average particle diameter of the graft copolymer (G′-4).

  Thereafter, a graft copolymer (G′-4) powder was obtained in the same manner as in Example 1. Table 2 shows the graft ratio and volume average particle diameter of the obtained graft copolymer.

[Examples 6 to 12, Comparative Examples 6 to 15]
Graft copolymers obtained in Example 1, Example 3, Example 4, Example 5 or Comparative Examples 1-5 (G-1, G-3, G-4, G-5, G′-1 G′-5) powder, organic sulfonic acid metal salt (manufactured by DIC Corporation, trade name: Megafac F-114), polytetrafluoroethylene-containing powder J- obtained in Production Example 3 as an anti-drip agent 1 and polycarbonate resin (Mitsubishi Engineering Plastics Co., Ltd., trade name: Iupilon S-2000F, viscosity average molecular weight 22,000) and phenolic antioxidant (Ciba Japan Co., Ltd., trade name: Irganox) 245), a phosphorus-based antioxidant (manufactured by ADEKA, trade name: ADK STAB PEP36) was blended in the amounts shown in Table 3 or Table 4. The blend was melt-mixed at a cylinder temperature of 280 ° C. and a screw rotation speed of 150 rpm using a twin-screw extruder (L / D = 30) having a cylinder inner diameter of 30 mm to obtain a polycarbonate resin composition. Next, this polycarbonate resin composition was shaped into pellets.

  The obtained pellets were dried at 80 ° C. for 12 hours and then supplied to a 100 t injection molding machine (trade name: SE-100DU, manufactured by Sumitomo Heavy Industries, Ltd.), and injection molding was performed at a cylinder temperature of 280 ° C. and a mold temperature of 90 ° C. Each test piece was obtained. Next, using each test piece, measurement of Charpy impact strength, measurement of total light transmittance, and UL-94V test were performed, and the evaluation results shown in Table 3 or Table 4 were obtained.

[Examples 13 and 14, Comparative Examples 16 and 17]
Powder of graft copolymer (G-1, G-2, G′-1) obtained in Example 1, Example 2 or Comparative Example 1, aromatic phosphate ester flame retardant (Daihachi Chemical Industry ( Co., Ltd., product name: PX-200), polytetrafluoroethylene-containing powder J-2 (manufactured by Mitsubishi Rayon Co., Ltd., product name: Metabrene A-3800) as a dripping inhibitor, and polycarbonate resin (Iupilon S-) 2000F) was blended in the amounts listed in Table 5. Except for these, a polycarbonate resin composition and test pieces were obtained in the same manner as in Example 6. The evaluation results are shown in Table 5.

[Performance comparison of resin compositions of the first invention group]
The resin composition of Example 6 containing 1.0 part of the graft copolymer (G-1) is superior in flame retardancy, impact resistance and total light transmittance as compared with the resin composition of Comparative Example 6. I understood. In addition, the resin composition of Example 7 containing 3.1 parts of the graft copolymer (G-1) has flame retardancy, impact resistance, and total light transmittance as compared with the resin composition of Comparative Example 7. I found it excellent. The resin compositions of Examples 8 to 11 containing 5.3 parts of the graft copolymer (G-1), (G-3), (G-4), or (G-5) are comparative examples 8 to It was found to be excellent in flame retardancy, impact resistance, total light transmittance and appearance balance as compared with the 11 resin composition. In the resin composition of Comparative Example 8, the volume average particle diameter of the graft copolymer (G′-1) is smaller than 300 nm, and the component derived from the vinyl polymerizable group-containing silane compound in the polyorganosiloxane (B1). Since the content was less than 1% by mass, the flame retardancy, the total light transmittance, and the appearance near the gate were low.

  The resin composition of Comparative Example 9 had low flame retardancy because the content of polyorganosiloxane in the graft copolymer (G′-2) was less than 70% by mass. In the resin composition of Comparative Example 10, the graft ratio of the graft copolymer (G′-3) is more than 10% by mass, the amount of the polyfunctional vinyl monomer used is 0% by mass, Since the alkyl acrylate (B2) was not contained, the flame retardancy, the low temperature impact strength, and the appearance in the vicinity of the gate were low. In the resin composition of Comparative Example 11, the content of the component derived from the vinyl polymerizable group-containing silane compound in the polyorganosiloxane (B1) of the graft copolymer (G′-5) is less than 1% by mass. Flame retardancy, low-temperature impact strength, total light transmittance, and appearance near the gate were low. Since the resin composition of Comparative Example 12 did not contain a graft copolymer, the impact strength was low.

  The resin composition of Example 12 in which 10.0 parts of the graft copolymer (G-1) was blended, compared with the resin compositions of Comparative Examples 13 to 15, flame retardancy, impact strength, total light transmittance, It was found that the balance between slidability and chemical resistance was excellent. Since the resin composition of Comparative Example 13 contained less than 70% by mass of polyorganosiloxane in the graft copolymer (G′-2), the flame retardancy and slidability were low. In the resin composition of Comparative Example 14, the acetone-soluble content of the graft copolymer (G′-4) is less than 5% by mass, and the graft ratio is more than 10% by mass. And the chemical resistance was low. Since the resin composition of Comparative Example 15 did not contain a graft copolymer, the low-temperature impact strength, slidability, and chemical resistance were low.

  Even when a phosphorus-based flame retardant was used, it was found that the resin compositions of Examples 13 and 14 were superior in flame retardancy and low-temperature impact resistance as compared with the resin composition of Comparative Example 16. In the resin composition of Comparative Example 16, the volume average particle diameter of the graft copolymer (G′-1) is smaller than 300 nm, and the component derived from the vinyl polymerizable group-containing silane compound in the polyorganosiloxane (B1). Since the content was less than 1% by mass, the flame retardancy and the low temperature impact strength were low. Moreover, since the resin composition of Comparative Example 17 did not contain a graft copolymer, the flame retardancy and low-temperature impact strength were low.

  The following are examples of the second invention group.

[Example 21]
In a separable flask having a capacity of 5 liters equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer and a stirrer, 272.1 parts of the polyorganosiloxane latex (S-4) obtained in Production Example 5 (polyorganosiloxane) As 80 parts). Furthermore, after adding and mixing 50 parts of deionized water, a mixture of 10.0 parts of butyl acrylate (n-BA), 0.18 parts of allyl methacrylate (AMA) and 0.04 parts of cumene hydroperoxide (CHP) is added. did.

  By passing a nitrogen stream through the separable flask, the atmosphere in the flask was replaced with nitrogen, and the temperature was raised to 60 ° C. Liquid temperature was 60 ° C., ferrous sulfate (Fe) 0.001 part, disodium ethylenediaminetetraacetate (EDTA) 0.003 part, sodium formaldehyde sulfoxylate (SFS) 0.3 part, deionized water 2 Then, an aqueous solution of 5 parts was added, and then the liquid temperature was maintained at 70 ° C. for 1 hour to obtain a composite rubber latex.

  While maintaining the latex temperature of the composite rubber at 70 ° C., 9.5 parts of methyl methacrylate (MMA), 0.5 part of butyl acrylate (n-BA), 0 part of t-butyl hydroperoxide (t-BH) 0 .05 parts of the mixture was polymerized dropwise over 60 minutes.

  After completion of the dropping, the liquid temperature was maintained at 70 ° C. for 1 hour and then cooled to 25 ° C. to obtain a latex of graft copolymer (G-21). Table 6 shows the measurement results of the mass average particle diameter Dw and particle diameter distribution Dw / Dn of the graft copolymer in this latex.

  Next, 500 parts of an aqueous solution having a calcium chloride concentration of 5.0% by mass was heated to a temperature of 60 ° C. and stirred. Into this, 340 parts of the latex was gradually dropped and coagulated. The obtained graft copolymer was filtered and dehydrated. Furthermore, after adding 10 times the amount of water to 100 parts of the graft copolymer, the mixture was washed for 10 minutes in a flask equipped with a stirrer, filtered and dehydrated. This operation was repeated twice, followed by drying to obtain a graft copolymer (G-21) powder. The powder of the graft copolymer (G-21) can be used as a sliding property improving agent.

[Example 22]
3 parts of the graft copolymer (G-21) obtained in Example 21, 97 parts of PC resin (Mitsubishi Engineering Plastics, Iupilon S-2000F), carbon black (Mitsubishi Chemical Corporation, # 960B) was hand blended. The obtained resin composition was then melt-mixed at a cylinder temperature of 280 ° C. and a screw rotation speed of 150 rpm using a 30 mmφ twin-screw extruder (L / D = 30) and shaped into pellets.

  The obtained pellets were dried at 80 ° C. for 12 hours, and then supplied to a 100 t injection molding machine (manufactured by Sumitomo Heavy Industries, Ltd., product name: SE-100DU). Injection molding was performed. Using family mold according to JIS K7152, Charpy impact strength (length 80.0mm, width 10.0mm, thickness 4mm, with V notch), slidability, color development (length 100mm, width 50mm, thickness 2mm) Each test piece for evaluation was obtained. Table 7 shows various evaluation results using the pellets and the test pieces.

[Examples 23 and 24]
A thermoplastic resin composition, pellets, and test pieces were obtained in the same manner as in Example 22 except that the amount of the graft copolymer (G-21) and the PC resin used was changed. Various evaluation results are shown in Table 7.

[Example 25]
Except having changed into the composition shown in Table 6, it superposed | polymerized like Example 21 and obtained the graft copolymer (G-25). The evaluation results of this graft copolymer are shown in Table 6.

[Examples 26 to 29]
A thermoplastic resin composition, pellets and test pieces were obtained in the same manner as in Example 21, except that the amounts of the graft copolymer (G-25) and the PC resin were changed to the values shown in Table 7. Various evaluation results are shown in Table 7.

[Comparative Example 21]
Graft polymerization was carried out in the same manner as in Example 21 except that the raw material used for graft polymerization was changed to the composition shown in Table 6 to obtain a graft copolymer (G'-21). The evaluation results of this graft copolymer are shown in Table 6.

[Comparative Examples 22 and 23]
A thermoplastic resin composition, pellets and a test piece were obtained in the same manner as in Example 21 except that the amount of the graft copolymer (G′-21) and the PC resin used was set to the values shown in Table 7. Various evaluation results are shown in Table 7.

[Comparative Example 24]
Polymerization was carried out in the same manner as in Example 21 except that the raw material for carrying out the graft polymerization was changed to the composition shown in Table 6 to obtain a graft copolymer (G′-24). The evaluation results of this graft copolymer are shown in Table 6.

[Comparative Examples 25-27]
A thermoplastic resin composition, pellets and a test piece were obtained in the same manner as in Example 21 except that the amount of the graft copolymer (G′-24) and the PC resin used was set to the values shown in Table 7. Various evaluation results are shown in Table 7.

[Performance comparison of resin composition of second invention group]
As is apparent from Examples 22-24 and 26-29, the thermoplastic resin composition using the slidability improver of the present invention is excellent in slidability, and further has color developability and Charpy impact strength. Good results were also obtained for the molded appearance.

  On the other hand, the thermoplastic resin compositions of Comparative Examples 22 and 23 had low slidability and Charpy impact strength at low temperatures because the polyorganosiloxane content in the slidability improver used was small. In the thermoplastic resin compositions of Comparative Examples 25 and 26, since the mass average particle diameter of the slidability improver used is small, the color developability is low, and further, a flow mark is easily formed near the gate during molding. The appearance was bad. In the thermoplastic resin of Comparative Example 27, since no slidability improver was used, the slidability was low, and the Charpy impact strength at a low temperature was extremely poor.

A resin composition obtained by blending the graft copolymer (G _F ) of the first invention group with a thermoplastic resin (particularly a polycarbonate resin) has flame resistance, impact resistance, color development, slidability, Excellent chemical properties. This resin composition is useful as a material in the fields of automobiles, OA equipment such as printers, and electric / electronic fields such as mobile phones.

A resin composition obtained by blending a thermoplastic resin with a slidability improving agent comprising a powder of the graft copolymer (G _S ) of the second invention group has a slidability and color developability (pigment colorability). The impact strength balance is excellent, and the molded appearance is also good. The molded body obtained from this resin composition is widely useful in various fields including automobiles, building materials, toys, stationery and other miscellaneous goods, OA equipment, and home appliances, and can be used particularly as a sliding member.

Claims (11)

A slidability improving agent comprising a rubber-containing graft copolymer (G _S ) powder obtained by graft-polymerizing one or more vinyl monomers to a rubber containing polyorganosiloxane, the rubber-containing graft copolymer (G _S) the content of the polyorganosiloxane in is 40 to 95 wt%, for improving sliding property mass average particle diameter Dw of the latex of the rubber-containing graft copolymer (G _S) is 300~2000nm Agent. The rubber-containing graft copolymer particle size distribution of the latex (G _S) (mass median particle size Dw / number average particle diameter Dn) is sliding properties according to claim 1, wherein from 1.0 to 2.0 Improver. The content of the polyorganosiloxane of the rubber-containing graft copolymer (G _S) is replaced by a sliding property improving agent of claim 1 or 2 which is 41 to 74 mass%. The rubber-containing graft copolymer weight average particle diameter Dw of the latex (G _S) is, sliding property improving agent according to any one paragraph selected from claims 1 to 3 is 400 to 1000 nm.   The slidability improving agent according to any one of claims 1 to 4, wherein the rubber containing the polyorganosiloxane is a composite rubber containing a polyorganosiloxane and a polyalkyl acrylate.   The thermoplastic resin composition for sliding members containing the sliding property improving agent and thermoplastic resin as described in any one of Claims 1-5.   The thermoplastic resin composition for a sliding member according to claim 6, wherein the content of the slidability improver is 4 to 16% by mass, and the content of the thermoplastic resin is 96 to 84% by mass.   The thermoplastic resin for a sliding member according to claim 6, wherein the content of the slidability improver is 5.1 to 16% by mass, and the content of the thermoplastic resin is 94.9 to 84% by mass. Composition.   The thermoplastic resin composition for a sliding member according to claim 6, wherein the content of the slidability improver is 7 to 15% by mass, and the content of the thermoplastic resin is 93 to 85% by mass.   The thermoplastic resin composition for a sliding member according to any one of claims 6 to 9, wherein the thermoplastic resin is a polycarbonate resin. The sliding member formed by shape | molding the thermoplastic resin composition for sliding members as described in any one of Claims 6-10.

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