JP6297829B2 - Thermoplastic resin composition for supercritical foam molding with excellent impact resistance - Google Patents

Description

  In the molding process of a foamed resin composition by physical foaming using a supercritical fluid, the present invention improves impact resistance by containing a core-shell graft copolymer having a specific particle diameter in a specific ratio. The present invention also relates to a thermoplastic resin composition for supercritical foam molding.

  In recent years, for plastic materials used in office machines such as laser beam printers, copiers, and projectors, electrical and electronic equipment such as personal computers, information communication equipment and cameras, automobile parts such as automobiles and railway vehicles, etc. Various properties such as mechanical strength, fluidity, flame retardancy, and dimensional accuracy are required depending on the application. In addition, regardless of the field or application, an environmentally conscious design has been made that focuses on reducing the amount of petroleum resources used by reducing the amount of resin used, or improving fuel efficiency by reducing the weight of vehicle parts, As part of this, manufacturing methods that reduce the weight and reduce the amount of resin used, such as thin wall design, hollow molding, and foam molding, have been adopted. Among these, foam injection molding using supercritical fluid has advantages such as elimination of sink marks and warpage of molded products, improvement of dimensional accuracy, and reduction of molding cycle time compared to normal injection molding. The use is expanding. However, the foam molded product has a problem in that it has inferior mechanical properties such as impact resistance as compared with a normal molded product because it has voids in the molded product.

  As a means for imparting impact resistance, there is a method of adding an impact modifier to the resin composition. In a blend of polycarbonate resin or polycarbonate resin and styrene resin, a core-shell type graft copolymer in which a vinyl polymer composed of one or more vinyl monomer units is graft-polymerized is added to the rubber component. Are common, and various types have been proposed. For example, aromatic polycarbonate resin, phosphate ester flame retardant, polytetrafluoroethylene, scaly inorganic filler, polyorganosiloxane rubber component and polyalkyl (meth) acrylate rubber component are intertwined so that they cannot be separated A composite rubber graft copolymer obtained by graft-polymerizing one or two or more vinyl monomers to a composite rubber having a different structure, or the composite rubber graft copolymer and a vinyl polymer A resin composition (Patent Document 1) comprising a mixture of the above, a resin containing a polycarbonate resin and an ABS resin, and a polyfunctional monomer having two or more unsaturated bonds in the molecule at 20% by mass or less. 20% by mass or more of a first acrylic rubber component polymerized from one composition and a polyfunctional monomer having two or more unsaturated bonds in the molecule And a second acrylic rubber component having a glass transition temperature different from that of the first acrylic rubber component, and 70% by mass or more in the number distribution is 0.3 μm or more and 0.3. A polycarbonate resin composition containing a graft copolymer obtained by graft polymerization of 0.1% by mass or more and 20% by mass or less of a vinyl monomer to 80% by mass or more and 99.9% by mass or less of a composite rubber having a particle diameter of 7 μm or less. (Patent Document 2) has been proposed. However, Patent Documents 1 and 2 do not describe foam molding and relate to a normal resin composition for injection molding.

  On the other hand, studies have also been made on foam molding, particularly foam molding using a supercritical fluid. For example, a method of obtaining a good foam at the time of supercritical foam molding by adding a powdery or fibrous porous filler and a melt tension adjusting agent to a thermoplastic resin (Patent Document 3), or a polycarbonate resin composition with silicone A method of obtaining a good foam at the time of supercritical foam molding by adding a compound (Patent Document 4), supercritical foam molding of a resin containing a polycarbonate-polydiorganosiloxane copolymer, A method for obtaining a molded article having excellent flammability (Patent Document 5) has been proposed. However, Patent Documents 3 to 5 are all related to a method for obtaining a foam having a uniform and fine foam structure in foam molding using a supercritical fluid. By controlling the foam structure, the mechanical properties are excellent. Although there is a description that a foam can be obtained, there is still room for improvement as a method of obtaining a molded product having mechanical properties comparable to that of normal molding during foam molding.

JP-A-7-228764 JP 2011-144247 A JP 2004-269583 A JP 2008-127466 A JP 2003-49018 A

  An object of the present invention is to provide a thermoplastic resin composition for supercritical foam molding which is excellent in impact resistance in fine foam molding using a supercritical fluid.

  As a result of intensive studies, the present inventor has found that the above-mentioned problems can be solved by containing a specific amount of a core-shell type graft copolymer having a specific number average particle diameter in an aromatic polycarbonate resin. Furthermore, in a Charpy impact test based on ISO 179 in some compositions, it was found that the Charpy impact strength of a foam molded product using a supercritical fluid is higher than that of a normal molded product not using a supercritical fluid. It was. The present invention has been completed by further study.

According to the present invention, the above-mentioned problem is composed of (B) acrylic rubber and one or more vinyl monomer units with respect to (1) (A) 100 parts by weight of the aromatic polycarbonate resin (component A). A graft copolymer obtained by graft polymerization of a vinyl polymer and / or a graft copolymer obtained by graft polymerization of a vinyl polymer composed of at least one vinyl monomer unit on an acrylic-silicone composite rubber. And a thermoplastic resin composition for supercritical foam molding containing 1.5 to 10 parts by weight of a graft copolymer (component B) having a number average particle diameter of 500 nm or less.
One of the preferred embodiments of the present invention is that the composition (1) contains 5 to 100 parts by weight of a styrene resin (component C) other than the component (C) with respect to 100 parts by weight of the component (2). It is a thermoplastic resin composition for supercritical foam molding.
One of the preferred embodiments of the present invention is the above-mentioned constitution (1) or (2), wherein (D) phosphorus flame retardant (D component) is contained in an amount of 5 to 35 parts by weight per 100 parts by weight of (3) A component This is a thermoplastic resin composition for supercritical foam molding.
One preferred embodiment of the present invention is the above (4) containing 0.05 to 5 parts by weight of a fluorine-containing anti-dripping agent (E component) having fibril-forming ability with respect to 100 parts by weight of the A component. It is a thermoplastic resin composition for supercritical foam molding in any one of constitutions (1) to (3).
One of the preferred embodiments of the present invention is the above-mentioned constitutions (1) to (5) containing 0.1 to 5 parts by weight of (F) silicate mineral (F component) with respect to 100 parts by weight of (5) A component. 4) The thermoplastic resin composition for supercritical foam molding according to any one of 4).
One of the suitable aspects of the present invention is (6) the supercritical foam molding thermoplastic resin composition of the above constitution (5), wherein the F component is talc.
One of the preferred embodiments of the present invention is (7) a thermoplastic resin for supercritical foam molding according to any one of the above-mentioned constitutions (1) to (6), wherein the supercritical fluid used for supercritical foam molding is nitrogen. It is a composition.
One of the preferred embodiments of the present invention is a foam-molded article comprising (8) the supercritical foam-molding thermoplastic resin composition of any one of the above constitutions (1) to (7).
One of the preferred embodiments of the present invention is (9) of the above-described configuration (8), which is a part used in an office machine, a household appliance, an electric / electronic device, or a vehicle having a weight reduction rate of 3% or more. It is a foam molded product.

Details of the present invention will be described below.
(A component: polycarbonate resin)
The polycarbonate resin used in the present invention is obtained by reacting a dihydric phenol and a carbonate precursor. Examples of the reaction method include an interfacial polymerization method, a melt transesterification method, a solid phase transesterification method of a carbonate prepolymer, and a ring-opening polymerization method of a cyclic carbonate compound.

  Representative examples of the dihydric phenol used here include hydroquinone, resorcinol, 4,4′-biphenol, 1,1-bis (4-hydroxyphenyl) ethane, and 2,2-bis (4-hydroxyphenyl). ) Propane (commonly called bisphenol A), 2,2-bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxyphenyl) butane, 1,1-bis (4-hydroxyphenyl)- 1-phenylethane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 2,2-bis (4-hydroxyphenyl) Pentane, 4,4 ′-(p-phenylenediisopropylidene) diphenol, 4,4 ′-(m-phenylenediisopropyl Pyridene) diphenol, 1,1-bis (4-hydroxyphenyl) -4-isopropylcyclohexane, bis (4-hydroxyphenyl) oxide, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfoxide, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) ketone, bis (4-hydroxyphenyl) ester, bis (4-hydroxy-3-methylphenyl) sulfide, 9,9-bis (4-hydroxyphenyl) Examples include fluorene and 9,9-bis (4-hydroxy-3-methylphenyl) fluorene. A preferred dihydric phenol is bis (4-hydroxyphenyl) alkane, and bisphenol A is particularly preferred from the viewpoint of impact resistance, and is widely used.

  In the present invention, in addition to bisphenol A-based polycarbonate, which is a general-purpose polycarbonate, it is possible to use a special polycarbonate produced using other dihydric phenols as the A component. Moreover, it is also possible to use a polycarbonate-polyorganosiloxane copolymer obtained by copolymerizing polyorganosiloxane units.

  For example, as part or all of the dihydric phenol component, 4,4 ′-(m-phenylenediisopropylidene) diphenol (hereinafter sometimes abbreviated as “BPM”), 1,1-bis (4-hydroxy) Phenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane (hereinafter sometimes abbreviated as “Bis-TMC”), 9,9-bis (4-hydroxyphenyl) Polycarbonate (homopolymer or copolymer) using fluorene and 9,9-bis (4-hydroxy-3-methylphenyl) fluorene (hereinafter sometimes abbreviated as “BCF”) has dimensions due to water absorption. It is suitable for applications where the demands for change and shape stability are particularly severe. These dihydric phenols other than BPA are preferably used in an amount of 5 mol% or more, particularly 10 mol% or more of the entire dihydric phenol component constituting the polycarbonate.

In particular, when high rigidity and better hydrolysis resistance are required, it is particularly preferable that the component A constituting the resin composition is a copolymerized polycarbonate of the following (1) to (3). is there.
(1) BPM is 20 to 80 mol% (more preferably 40 to 75 mol%, more preferably 45 to 65 mol%) in 100 mol% of the dihydric phenol component constituting the polycarbonate, and BCF Of 20 to 80 mol% (more preferably 25 to 60 mol%, more preferably 35 to 55 mol%).
(2) BPA is 10 to 95 mol% (more preferably 50 to 90 mol%, more preferably 60 to 85 mol%) in 100 mol% of the dihydric phenol component constituting the polycarbonate, and BCF Is 5 to 90 mol% (more preferably 10 to 50 mol%, more preferably 15 to 40 mol%).
(3) BPM is 20 to 80 mol% (more preferably 40 to 75 mol%, more preferably 45 to 65 mol%) in 100 mol% of the dihydric phenol component constituting the polycarbonate, and Bis -Copolymer polycarbonate in which TMC is 20 to 80 mol% (more preferably 25 to 60 mol%, still more preferably 35 to 55 mol%).

These special polycarbonates may be used alone or in combination of two or more. Moreover, these can also be mixed and used for the bisphenol A type polycarbonate generally used.
The production method and characteristics of these special polycarbonates are described in detail in, for example, JP-A-6-172508, JP-A-8-27370, JP-A-2001-55435, and JP-A-2002-117580. ing.

Of the various polycarbonates described above, those having a water absorption and Tg (glass transition temperature) adjusted within the following ranges by adjusting the copolymer composition, etc. have good hydrolysis resistance of the polymer itself, and Since it is remarkably excellent in low warpage after molding, it is particularly suitable in a field where form stability is required.
(I) polycarbonate having a water absorption of 0.05 to 0.15%, preferably 0.06 to 0.13% and Tg of 120 to 180 ° C, or (ii) Tg of 160 to 250 ° C, Polycarbonate which is preferably 170 to 230 ° C. and has a water absorption of 0.10 to 0.30%, preferably 0.13 to 0.30%, more preferably 0.14 to 0.27%.

Here, the water absorption of the polycarbonate is a value obtained by measuring the moisture content after being immersed in water at 23 ° C. for 24 hours in accordance with ISO 62-1980 using a disc-shaped test piece having a diameter of 45 mm and a thickness of 3.0 mm. is there. Moreover, Tg (glass transition temperature) is a value calculated | required by the differential scanning calorimeter (DSC) measurement based on JISK7121.
As the carbonate precursor, carbonyl halide, carbonic acid diester, haloformate or the like is used, and specific examples include phosgene, diphenyl carbonate, dihaloformate of dihydric phenol, and the like.

  In producing the aromatic polycarbonate resin by the interfacial polymerization method using the dihydric phenol and the carbonate precursor, a catalyst, a terminal terminator, and an antioxidant for preventing the dihydric phenol from being oxidized as necessary. Etc. may be used. The aromatic polycarbonate resin of the present invention is a branched polycarbonate resin copolymerized with a trifunctional or higher polyfunctional aromatic compound, a polyester copolymerized with an aromatic or aliphatic (including alicyclic) difunctional carboxylic acid. Carbonate resin, copolymer polycarbonate resin copolymerized with bifunctional alcohol (including alicyclic), and polyester carbonate resin copolymerized with such bifunctional carboxylic acid and bifunctional alcohol are included. Moreover, the mixture which mixed 2 or more types of the obtained aromatic polycarbonate resin may be sufficient.

  The branched polycarbonate resin can impart anti-drip performance or the like to the resin composition of the present invention. Examples of the trifunctional or higher polyfunctional aromatic compound used in the branched polycarbonate resin include phloroglucin, phloroglucid, or 4,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-2, 2 , 4,6-trimethyl-2,4,6-tris (4-hydroxyphenyl) heptane, 1,3,5-tris (4-hydroxyphenyl) benzene, 1,1,1-tris (4-hydroxyphenyl) Ethane, 1,1,1-tris (3,5-dimethyl-4-hydroxyphenyl) ethane, 2,6-bis (2-hydroxy-5-methylbenzyl) -4-methylphenol, 4- {4- [ Trisphenol such as 1,1-bis (4-hydroxyphenyl) ethyl] benzene} -α, α-dimethylbenzylphenol, tetra (4-hydride) Loxyphenyl) methane, bis (2,4-dihydroxyphenyl) ketone, 1,4-bis (4,4-dihydroxytriphenylmethyl) benzene, or trimellitic acid, pyromellitic acid, benzophenonetetracarboxylic acid and their acids Among them, 1,1,1-tris (4-hydroxyphenyl) ethane and 1,1,1-tris (3,5-dimethyl-4-hydroxyphenyl) ethane are preferable. 1-Tris (4-hydroxyphenyl) ethane is preferred.

  The structural unit derived from the polyfunctional aromatic compound in the branched polycarbonate is preferably a total of 100 mol% of the structural unit derived from the dihydric phenol and the structural unit derived from the polyfunctional aromatic compound. It is 0.01-1 mol%, More preferably, it is 0.05-0.9 mol%, More preferably, it is 0.05-0.8 mol%.

In particular, in the case of the melt transesterification method, a branched structural unit may be generated as a side reaction, and the amount of the branched structural unit is preferably 100% by mole in total with the structural unit derived from dihydric phenol. The content is preferably 0.001 to 1 mol%, more preferably 0.005 to 0.9 mol%, and still more preferably 0.01 to 0.8 mol%. The ratio of the branched structure can be calculated by ¹ H-NMR measurement.

  The aliphatic bifunctional carboxylic acid is preferably α, ω-dicarboxylic acid. Examples of the aliphatic difunctional carboxylic acid include sebacic acid (decanedioic acid), dodecanedioic acid, tetradecanedioic acid, octadecanedioic acid, icosanedioic acid and other straight-chain saturated aliphatic dicarboxylic acids, and cyclohexanedicarboxylic acid. Preferred are alicyclic dicarboxylic acids such as As the bifunctional alcohol, an alicyclic diol is more preferable, and examples thereof include cyclohexanedimethanol, cyclohexanediol, and tricyclodecane dimethanol.

  Reaction formats such as interfacial polymerization, melt transesterification, carbonate prepolymer solid phase transesterification, and ring-opening polymerization of cyclic carbonate compounds, which are methods for producing the polycarbonate-based resin of the present invention, are various documents and patent publications. This is a well-known method.

In producing the resin composition of the present invention, the viscosity average molecular weight (M) of the polycarbonate-based resin is not particularly limited, but is preferably 1 × 10 ^{4 to} 5 × 10 ⁴ , more preferably 1.4 × 10. ^{4 to} 3 × 10 ⁴ , more preferably 1.4 × 10 ^{4 to} 2.4 × 10 ⁴ .

With a polycarbonate resin having a viscosity average molecular weight of less than 1 × 10 ⁴ , good mechanical properties may not be obtained. On the other hand, a resin composition obtained from an aromatic polycarbonate resin having a viscosity average molecular weight exceeding 5 × 10 ⁴ may be inferior in versatility in that it has poor fluidity during injection molding.

In addition, the said polycarbonate-type resin may be obtained by mixing that whose viscosity average molecular weight is outside the said range. In particular, a polycarbonate resin having a viscosity average molecular weight exceeding the above range (5 × 10 ⁴ ) improves the entropy elasticity of the resin. As a result, good moldability is exhibited in gas assist molding and foam molding which may be used when molding a resin material into a structural member. Such improvement in moldability is even better than that of the branched polycarbonate. As a more preferable aspect, the A component has a viscosity average molecular weight of 7 × 10 ^{4 to} 3 × 10 ⁵ polycarbonate resin A-1-1-1 component), and the viscosity average molecular weight of 1 × 10 ^{4 to} 3 × 10 ⁴ . Polycarbonate resin (A-1-1 component) consisting of an aromatic polycarbonate resin (A-1-1-2 component) and having a viscosity average molecular weight of 1.6 × 10 ^{4 to} 3.5 × 10 ⁴ , Sometimes referred to as “high molecular weight component-containing polycarbonate resin”).

In such a high molecular weight component-containing polycarbonate resin (A-1-1 component), the molecular weight of the A-1-1-1 component is preferably 7 × 10 ⁴ to 2 × 10 ⁵ , more preferably 8 × 10 ⁴ to 2. × 10 ⁵ , more preferably 1 × 10 ⁵ to 2 × 10 ⁵ , and particularly preferably 1 × 10 ^{5 to} 1.6 × 10 ⁵ . The molecular weight of the A-1-1-2 component is preferably 1 × 10 ^{4 to} 2.5 × 10 ⁴ , more preferably 1.1 × 10 ^{4 to} 2.4 × 10 ⁴ , and still more preferably 1.2 ×. 10 ^{4 to} 2.4 × 10 ⁴ , particularly preferably 1.2 × 10 ^{4 to} 2.3 × 10 ⁴ .

  The high molecular weight component-containing polycarbonate resin (A-1-1 component) is a mixture of the A-1-1-1 component and the A-1-1-2 component in various proportions so as to satisfy a predetermined molecular weight range. It can be obtained by adjusting. Preferably, in 100% by weight of the A-1-1 component, the A-1-1-1 component is 2 to 40% by weight, and more preferably, the A-1-1-1 component is 3 to 30% by weight. More preferably, the A-1-1-1 component is 4 to 20% by weight, and particularly preferably the A-1-1-1 component is 5 to 20% by weight.

  Moreover, as a preparation method of A-1-1 component, (1) The method of superposing | polymerizing each A-1-1-1 component and A-1-1-2 component independently, and mixing these, (2 ) A method for producing an aromatic polycarbonate resin showing a plurality of polymer peaks in a molecular weight distribution chart by GPC method represented by the method disclosed in Japanese Patent Application Laid-Open No. 5-306336 in the same system. And (3) an aromatic polycarbonate resin obtained by the production method (production method (2)) and A separately produced A. Examples thereof include a method of mixing the 1-1-1 component and / or the A-1-1-2 component.

The viscosity average molecular weight referred to in the present invention is first determined by using an Ostwald viscometer from a solution in which 0.7 g of polycarbonate is dissolved in 100 ml of methylene chloride at 20 ° C. with a specific viscosity (η _SP ) calculated by the following formula:
Specific viscosity (η _SP ) = (t−t ₀ ) / t ₀
[T ₀ is methylene chloride falling seconds, t is sample solution falling seconds]
The viscosity average molecular weight M is calculated from the determined specific viscosity (η _SP ) by the following formula.
η _SP /c=[η]+0.45×[η] ² c (where [η] is the intrinsic viscosity)
[Η] = 1.23 × 10 ⁻⁴ M ^0.83
c = 0.7

  The viscosity average molecular weight of the polycarbonate resin in the resin composition of the present invention is calculated as follows. That is, the composition is mixed with 20 to 30 times its weight of methylene chloride to dissolve the soluble component in the composition. Such soluble matter is collected by Celite filtration. Thereafter, the solvent in the obtained solution is removed. The solid after removal of the solvent is sufficiently dried to obtain a solid component that dissolves in methylene chloride. A specific viscosity at 20 ° C. is determined from a solution obtained by dissolving 0.7 g of the solid in 100 ml of methylene chloride in the same manner as described above, and the viscosity average molecular weight M is calculated from the specific viscosity in the same manner as described above.

(B component: Graft copolymer)
The graft copolymer used in the present invention is a core-shell type in which a vinyl polymer composed of one or more vinyl monomer units is polymerized on a polymer core made of acrylic rubber or acrylic silicone composite rubber. The graft copolymer. Specific examples include MA (methyl methacrylate-acrylic rubber) copolymer, MAS (methyl methacrylate-acrylic rubber-styrene) copolymer, methyl methacrylate- (acrylic / silicone IPN rubber) copolymer, and the like. . Moreover, the graft copolymer used for this invention may mix and use the said graft copolymer 2 or more types.
The weight ratio of the grafted component of the graft copolymer to the rubber substrate (graft ratio (% by weight)) is preferably 10 to 100%, more preferably 15 to 70%, and still more preferably 15 to 40%.

  The number average particle diameter of the graft copolymer is 500 nm or less, preferably 400 nm or less, and more preferably 300 nm or less. As the distribution of the rubber particle diameter, either a single distribution or a rubber particle having two or more peaks can be used, and the rubber particles form a single phase in the morphology. Alternatively, it may have a salami structure by containing an occluded phase around the rubber particles. When the number average particle diameter is larger than 500 nm, the impact resistance of the molded product in the supercritical fluid fine foam molding becomes insufficient. The lower limit of the number average particle system is not particularly limited, but is preferably 50 nm or more, and more preferably 100 nm or more.

  The number average particle size of the graft copolymer in the present invention is the primary particle size of the composite rubber-based graft copolymer dispersed in the aromatic polycarbonate resin of the matrix by observation with a transmission electron microscope (TEM). It is a value obtained by measurement. Specifically, for example, it can be obtained in the following manner.

The ultrathin slice having a thickness of 100 nm cut out from the resin composition pellet of the present invention is exposed to osmium tetroxide vapor for 60 minutes and further to ruthenium tetroxide vapor for 60 minutes, and then stained, and then subjected to TEM observation. Next, using the image obtained by TEM observation, the average diameter of 30 graft copolymers dispersed in the matrix is measured, and the number average is defined as the number average particle diameter in the present invention.
Content of B component is 1.5-10 weight part with respect to 100 weight part of A component, 2-7 weight part is preferable, and 3-6 weight part is more preferable. When the content is less than 1.5 parts by weight and more than 10 parts by weight, the impact resistance at the time of supercritical foam molding is greatly inferior to that at the time of normal molding without using a supercritical fluid. End up.

(C component: styrene resin other than B component)
The resin composition of the present invention contains a styrene resin other than the B component as the C component. Since this styrenic resin has good moldability, moderate heat resistance and flame retardancy, it is a preferred thermoplastic resin in order to maintain a balance between these properties.
Such a styrenic resin is a copolymer or copolymer of an aromatic vinyl compound, and, if necessary, at least one selected from other vinyl monomers and rubbery polymers copolymerizable therewith. It is a polymer obtained by polymerization.

  As the aromatic vinyl compound, styrene is particularly preferable. Preferable examples of the other vinyl monomer copolymerizable with the aromatic vinyl compound include a vinyl cyanide compound and a (meth) acrylic acid ester compound. A particularly preferred vinyl cyanide compound is acrylonitrile, and a particularly preferred (meth) acrylic acid ester compound is methyl methacrylate.

  Other vinyl monomers copolymerizable with aromatic vinyl compounds other than vinyl cyanide compounds and (meth) acrylic acid ester compounds include epoxy group-containing methacrylic acid esters such as glycidyl methacrylate, maleimide, N-methylmaleimide, Examples thereof include maleimide monomers such as N-phenylmaleimide, α, β-unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, phthalic acid and itaconic acid, and anhydrides thereof.

  Examples of the rubbery polymer copolymerizable with the aromatic vinyl compound include polybutadiene, polyisoprene, and diene copolymers (eg, styrene / butadiene random copolymers and block copolymers, acrylonitrile / butadiene copolymers). , And (meth) acrylic acid alkyl ester and butadiene copolymers), ethylene and α-olefin copolymers (eg, ethylene / propylene random copolymers and block copolymers, ethylene / butene random copolymers). Polymers and block copolymers), copolymers of ethylene and unsaturated carboxylic acid esters (for example, ethylene / methacrylate copolymers and ethylene / butyl acrylate copolymers), copolymers of ethylene and aliphatic vinyl. Polymer (for example, ethylene / vinyl acetate copolymer) ), Ethylene-propylene and non-conjugated diene terpolymers (eg, ethylene / propylene / hexadiene copolymers), and silicone rubbers (eg, polyorganosiloxane rubbers, And an IPN type rubber composed of an organosiloxane rubber component and a polyisobutylene rubber component; that is, a rubber having a structure in which two rubber components are entangled with each other so that they cannot be separated.

  Specific examples of the styrene resin include styrene resins such as polystyrene resin, HIPS resin, ABS resin, AS resin, AES resin, ASA resin, MBS resin, MABS resin, and SMA resin, and (hydrogenated). Examples thereof include styrene-butadiene-styrene copolymer resins and (hydrogenated) styrene-isoprene-styrene copolymer resins. In addition, the notation of (hydrogenated) means that both non-hydrogenated resin and hydrogenated resin are included. Here, the MS resin is a copolymer resin mainly composed of methyl methacrylate and styrene, the AES resin is a copolymer resin mainly composed of acrylonitrile, ethylene-propylene rubber, and styrene, and the ASA resin is mainly composed of acrylonitrile, styrene, and acrylic rubber. The copolymer resin, MABS resin is a copolymer resin mainly composed of methyl methacrylate, acrylonitrile, butadiene and styrene, and the SMA resin is a copolymer resin mainly composed of styrene and maleic anhydride (MA).

Such a styrenic resin may have a high stereoregularity such as syndiotactic polystyrene by using a catalyst such as a metallocene catalyst during the production thereof. Further, in some cases, polymers and copolymers having a narrow molecular weight distribution, block copolymers, and polymers and copolymers having high stereoregularity obtained by methods such as anion living polymerization and radical living polymerization are used. It is also possible.
Among these, acrylonitrile / styrene copolymer resin (AS resin) and acrylonitrile / butadiene / styrene copolymer resin (ABS resin) are preferable. It is also possible to use a mixture of two or more styrenic polymers.

  The AS resin used in the present invention is a thermoplastic copolymer obtained by copolymerizing a vinyl cyanide compound and an aromatic vinyl compound. As such a vinyl cyanide compound, acrylonitrile can be particularly preferably used. As the aromatic vinyl compound, styrene and α-methylstyrene can be preferably used. The proportion of each component in the AS resin is preferably 5 to 50% by weight of vinyl cyanide compound, more preferably 15 to 35% by weight, and preferably 95% of aromatic vinyl compound when the total is 100% by weight. -50% by weight, more preferably 85-65% by weight. Further, these vinyl compounds may be used in combination with other copolymerizable vinyl compounds described above, and the content ratio thereof is preferably 15% by weight or less in the AS resin component. Moreover, conventionally well-known various things can be used for the initiator, chain transfer agent, etc. which are used by reaction as needed.

Such an AS resin may be produced by any of bulk polymerization, suspension polymerization, and emulsion polymerization, but is preferably bulk polymerization. The copolymerization method may be either one-stage copolymerization or multistage copolymerization. The reduced viscosity of the AS resin is preferably 0.2 to 1.0 dl / g, more preferably 0.3 to 0.5 dl / g. The reduced viscosity is a value obtained by precisely weighing 0.25 g of AS resin and measuring a solution obtained by dissolving in 50 ml of dimethylformamide over 2 hours in an environment of 30 ° C. using an Ubbelohde viscometer. A viscometer having a solvent flow time of 20 to 100 seconds is used. The reduced viscosity is determined from the following formula from the solvent flow down seconds (t ₀ ) and the solution flow down seconds (t).
Reduced viscosity (η _sp / C) = {(t / t ₀ ) −1} /0.5
When the reduced viscosity is less than 0.2 dl / g, the impact is lowered, and when it exceeds 1.0 dl / g, the fluidity is deteriorated.

  The ABS resin used in the present invention is a mixture of a thermoplastic graft copolymer obtained by graft polymerization of a vinyl cyanide compound and an aromatic vinyl compound to a diene rubber component, and a copolymer of a vinyl cyanide compound and an aromatic vinyl compound. It is. As the diene rubber component forming this ABS resin, for example, rubber having a glass transition temperature of −30 ° C. or lower such as polybutadiene, polyisoprene and styrene-butadiene copolymer is used, and the proportion thereof is 100% by weight of the ABS resin component. The content is preferably 5 to 80% by weight, more preferably 8 to 50% by weight, and particularly preferably 10 to 30% by weight. As the vinyl cyanide compound grafted on the diene rubber component, acrylonitrile is particularly preferably used. As the aromatic vinyl compound grafted on the diene rubber component, styrene and α-methylstyrene are particularly preferably used. The ratio of the component grafted to the diene rubber component is preferably 95 to 20% by weight, particularly preferably 50 to 90% by weight, based on 100% by weight of the ABS resin component. Furthermore, it is preferable that the vinyl cyanide compound is 5 to 50% by weight and the aromatic vinyl compound is 95 to 50% by weight with respect to 100% by weight of the total amount of the vinyl cyanide compound and the aromatic vinyl compound. Further, methyl (meth) acrylate, ethyl acrylate, maleic anhydride, N-substituted maleimide and the like can be mixed and used for a part of the components grafted to the diene rubber component, and the content ratio thereof is in the ABS resin component. What is 15 weight% or less is preferable. Furthermore, conventionally known various initiators, chain transfer agents, emulsifiers and the like can be used as necessary.

  The rubber particle diameter of the ABS resin of the present invention is preferably 0.1 to 5.0 μm, more preferably 0.15 to 1.5 μm, and particularly preferably 0.2 to 0.8 μm. As the distribution of the rubber particle diameter, either a single distribution or a rubber particle having two or more peaks can be used, and the rubber particles form a single phase in the morphology. Alternatively, it may have a salami structure by containing an occluded phase around the rubber particles.

In addition, it is well known that the ABS resin contains a vinyl cyanide compound and an aromatic vinyl compound that are not grafted to the diene rubber component, and the ABS resin of the present invention is free of the occurrence of such polymerization. The polymer component may be contained. The reduced viscosity of the copolymer comprising such a free vinyl cyanide compound and aromatic vinyl compound is preferably a reduced viscosity (30 ° C.) determined by the above-described method of 0.2 to 1.0 dl / g. Preferably it is 0.3-0.7 dl / g.
The ratio of the grafted vinyl cyanide compound and aromatic vinyl compound is preferably 20 to 200%, more preferably 20 to 70% in terms of graft ratio (% by weight) with respect to the diene rubber component. is there.

  Such an ABS resin may be produced by any of bulk polymerization, suspension polymerization, and emulsion polymerization, but is preferably bulk polymerization. Further, as such bulk polymerization method, typically, continuous bulk polymerization method (so-called Toray method) described in Chemical Engineering Vol. 48, No. 6, page 415 (1984), and Chemical Engineering Vol. 53, No. 6, page 423 ( 1989), a continuous bulk polymerization method (so-called Mitsui Toatsu method) is exemplified. Any ABS resin is preferably used as the ABS resin of the present invention. Further, the copolymerization may be carried out in one step or in multiple steps. Moreover, what blended the vinyl compound polymer obtained by copolymerizing an aromatic vinyl compound and a vinyl cyanide component separately to the ABS resin obtained by this manufacturing method can also be used preferably. An ABS resin that does not contain a lubricant (such as ethylene bis-stearic acid amide (EBS)) exhibits more excellent flame retardancy.

  As the AS resin and the ABS resin, those having a reduced amount of alkali (earth) metal are more preferable from the viewpoint of good thermal stability and hydrolysis resistance. The amount of alkali (earth) metal in the styrenic resin is preferably less than 100 ppm, more preferably less than 80 ppm, still more preferably less than 50 ppm, and particularly preferably less than 10 ppm. Also from this point, AS resin and ABS resin by a bulk polymerization method are preferably used. Furthermore, in relation to such good thermal stability and hydrolysis resistance, when an emulsifier is used in the AS resin and ABS resin, the emulsifier is preferably a sulfonate salt, more preferably an alkyl sulfonic acid. It is salt. When a coagulant is used, the coagulant is preferably sulfuric acid or an alkaline earth metal salt of sulfuric acid.

  The content of component C is preferably 5 to 100 parts by weight, more preferably 10 to 80 parts by weight, and still more preferably 15 to 50 parts by weight with respect to 100 parts by weight of component A. When the content is less than 5 parts by weight, sufficient fluidity may not be obtained. When the content exceeds 100 parts by weight, the impact resistance at the time of supercritical foam molding is at the time of normal molding without using a supercritical fluid. In some cases, it is greatly inferior to the impact resistance.

(D component: phosphorus flame retardant)
As the phosphorus-based flame retardant of the present invention, a phosphate compound, particularly an aryl phosphate compound is suitable. Such a phosphate compound is effective in improving flame retardancy, and since the phosphate compound has a plasticizing effect, there is a decrease in heat resistance, but it is advantageous in that the molding processability of the resin composition of the present invention can be improved. It is. As the phosphate compound, various phosphate compounds known as conventional flame retardants can be used, and more preferably, one or more phosphate compounds represented by the following general formula (1) can be mentioned.

(X in the formula is hydroquinone, resorcinol, bis (4-hydroxydiphenyl) methane, bisphenol A, dihydroxydiphenyl, dihydroxynaphthalene, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) ketone, and bis ( 4-hydroxyphenyl) dihydric phenol residue derived from a dihydroxy compound selected from the group consisting of sulfides, and n is an integer of 0 to 5, or in the case of a mixture of n different phosphate esters, their average R ¹¹ , R ¹² , R ¹³ , and R ¹⁴ are each independently derived from an aryl group selected from the group consisting of phenol, cresol, xylenol, isopropylphenol, butylphenol, and p-cumylphenol. Feno Residue.)

The phosphate compound of formula (1) may be a mixture of compounds having different n numbers, and in the case of such a mixture, the average n number is preferably 0.5 to 1.5, more preferably 0.8. To 1.2, more preferably 0.95 to 1.15, and particularly preferably 1 to 1.14.
Preferable specific examples of the dihydric phenol for deriving X in the formula (1) include resorcinol, bisphenol A, and dihydroxydiphenyl, and among them, resorcinol and bisphenol A are preferable.
Preferable specific examples of the monohydric phenol for deriving R ¹¹ , R ¹² , R ¹³ , and R ¹⁴ of the above formula (1) include phenol, cresol, xylenol, and 2,6-dimethylphenol. And 2,6-dimethylphenol.

  Specific examples of the phosphate compound of the above formula (1) are mainly monophosphate compounds such as triphenyl phosphate and tri (2,6-xylyl) phosphate, and resorcinol bisdi (2,6-xylyl) phosphate). Phosphate oligomers, phosphate oligomers mainly composed of 4,4-dihydroxydiphenyl bis (diphenyl phosphate), and phosphate ester oligomers mainly composed of bisphenol A bis (diphenyl phosphate) are preferred. Resorcinol bisdi (2,6- Xylyl) phosphate) -based phosphate oligomer, 4,4-dihydroxydiphenylbis (diphenylphosphate) -based phosphate oligomer, and bisphenol A bis (diphenyl) Phosphoric acid ester oligomer mainly containing Sufeto) are preferred.

  The content of component D is preferably 3 to 35 parts by weight, more preferably 4 to 32.5 parts by weight, and still more preferably 5 to 30 parts by weight with respect to 100 parts by weight of component A. When the content is less than 3 parts by weight, flame retardancy may not be exhibited. When the content exceeds 35 parts by weight, the impact resistance may be insufficient.

(E component: fluorine-containing anti-dripping agent having fibril-forming ability)
The resin composition of this invention contains the fluorine-containing dripping inhibitor which has a fibril formation ability as E component. By including this dripping inhibitor, good flame retardancy can be achieved without impairing the physical properties of the molded product.
Examples of the component E include polytetrafluoroethylene, tetrafluoroethylene-based copolymers (for example, tetrafluoroethylene / hexafluoropropylene copolymer, etc.), partially fluorinated polymers as shown in US Pat. No. 4,379,910, fluorine And polycarbonate resin produced from a modified diphenol. Among them, polytetrafluoroethylene (hereinafter sometimes referred to as PTFE) is preferable.

  PTFE having a fibril forming ability has a very high molecular weight, and tends to be bonded to each other by an external action such as shearing force to form a fiber. The molecular weight is preferably 1 million to 10 million, more preferably 2 million to 9 million in terms of the number average molecular weight determined from the standard specific gravity. Such PTFE can be used in solid form or in the form of an aqueous dispersion. In addition, PTFE having such fibril forming ability uses a polytetrafluoroethylene mixture in a mixed form with other resins in order to improve dispersibility in the resin and to obtain better flame retardancy and mechanical properties. It is also possible.

  Examples of commercially available PTFE having such fibril forming ability include Teflon (registered trademark) 6J from Mitsui DuPont Fluorochemical Co., Ltd., Polyflon MPA FA500 and F-201L from Daikin Industries, Ltd. Commercially available PTFE aqueous dispersions include Asahi IC Fluoropolymers' full-on AD-1, AD-936, Daikin Kogyo's full-on D-1 and D-2, Mitsui Dupont Fluoro A typical example is Teflon (registered trademark) 30J manufactured by Chemical Corporation.

  As a mixed form of PTFE, (1) a method in which an aqueous dispersion of PTFE and an aqueous dispersion or solution of an organic polymer are mixed and co-precipitated to obtain a co-aggregated mixture (Japanese Patent Application Laid-Open No. 60-258263; (Method described in JP-A-63-154744), (2) A method of mixing an aqueous dispersion of PTFE and dried organic polymer particles (method described in JP-A-4-272957), (3) A method in which an aqueous dispersion of PTFE and an organic polymer particle solution are uniformly mixed, and each medium is simultaneously removed from the mixture (described in JP-A-06-220210, JP-A-08-188653, etc.) And (4) a method of polymerizing monomers forming an organic polymer in an aqueous dispersion of PTFE (a method described in JP-A-9-95583), and (5) A method in which an aqueous dispersion of TFE and an organic polymer dispersion are uniformly mixed, and a vinyl monomer is further polymerized in the mixture dispersion, and then a mixture is obtained (described in JP-A-11-29679, etc.). Those obtained by (Method) can be used. Examples of commercially available PTFE in a mixed form include “Metablene A3800” (trade name) manufactured by Mitsubishi Rayon Co., Ltd. and “BLENDEX B449” (trade name) manufactured by GE Specialty Chemicals.

  As a ratio of PTFE in the mixed form, PTFE is preferably 1 to 60% by weight, more preferably 5 to 55% by weight in 100% by weight of the polytetrafluoroethylene mixture. When the ratio of PTFE is within such a range, good dispersibility of PTFE can be achieved. In addition, the ratio of the said E component shows the quantity of a net anti-dripping agent, and in the case of PTFE of a mixed form, shows the amount of net PTFE.

  The styrenic monomer used in the organic polymer used in the polytetrafluoroethylene mixture of the present invention includes an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, and a halogen. Styrene which may be substituted with one or more groups selected from the group consisting of, for example, ortho-methylstyrene, meta-methylstyrene, para-methylstyrene, dimethylstyrene, ethyl-styrene, para-tert-butylstyrene, Examples include, but are not limited to, methoxystyrene, fluorostyrene, monobromostyrene, dibromostyrene, and tribromostyrene, vinyl xylene, vinyl naphthalene. The styrenic monomer can be used alone or in combination of two or more.

  The acrylic monomer used in the organic polymer used in the polytetrafluoroethylene mixture of the present invention contains an optionally substituted (meth) acrylate derivative. Specifically, the acrylic monomer includes at least one group selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 8 carbon atoms, an aryl group, and a glycidyl group. Optionally substituted (meth) acrylate derivatives such as (meth) acrylonitrile, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, amyl (meth) acrylate, hexyl (Meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, octyl (meth) acrylate, dodecyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate and glycidyl (meth) ) Acrylate, C1-6 alkyl Group, or maleimide which may be substituted by an aryl group, for example, maleimide, N- methyl - maleimide and N- phenyl - maleimide, maleic acid, phthalic acid and itaconic acid are exemplified, but are not limited thereto. The acrylic monomers can be used alone or in admixture of two or more. Among these, (meth) acrylonitrile is preferable.

  The amount of the acrylic monomer-derived unit contained in the organic polymer used in the coating layer is preferably 8 to 11 parts by weight, more preferably 8 to 10 parts by weight with respect to 100 parts by weight of the styrene monomer-derived unit. Parts, more preferably 8 to 9 parts by weight. If the acrylic monomer-derived unit is less than 8 parts by weight, the coating strength may be reduced, and if it is more than 11 parts by weight, the surface appearance of the molded product may be deteriorated.

  The polytetrafluoroethylene mixture of the present invention preferably has a residual water content of 0.5% by weight or less, more preferably 0.2 to 0.4% by weight, and still more preferably 0.1 to 0.3%. % By weight. If the residual water content is more than 0.5% by weight, the flame retardancy may be adversely affected.

  In the production process of the polytetrafluoroethylene mixture of the present invention, a coating layer containing one or more monomers selected from the group consisting of a styrene monomer and an acrylic monomer in the presence of an initiator is provided. Forming on the exterior of the branched polytetrafluoroethylene. Furthermore, the residual water content after the step of forming the coating layer is preferably 0.5% by weight or less, more preferably 0.2 to 0.4% by weight, still more preferably 0.1 to 0.3% by weight. It is preferable to include a step of drying. The drying step can be performed using methods known in the art such as, for example, hot air drying or vacuum drying methods.

  The initiator used in the polytetrafluoroethylene mixture of the present invention can be used without limitation as long as it is used in the polymerization reaction of styrene and / or acrylic monomers. Examples of the initiator include cumyl hydroperoxide, di-tert-butyl peroxide, benzoyl peroxide, hydrogen peroxide, and potassium peroxide, but are not limited thereto. In the polytetrafluoroethylene-based mixture of the present invention, one or more initiators can be used depending on the reaction conditions. The amount of the initiator is freely selected within the range used in consideration of the amount of polytetrafluoroethylene and the type / amount of monomer, and is 0.15 to 0.00 based on the amount of the total composition. It is preferable to use 25 parts by weight.

In the present invention, a branched polytetrafluoroethylene mixture can be used as an anti-dripping agent.
The branched polytetrafluoroethylene mixture is a polytetrafluoroethylene mixture composed of branched polytetrafluoroethylene particles and an organic polymer, and an organic polymer, preferably a styrene-based monomer, outside the branched polytetrafluoroethylene. It has a coating layer made of a polymer containing a monomer-derived unit and / or an acrylic monomer-derived unit. The coating layer is formed on the surface of branched polytetrafluoroethylene. The coating layer preferably contains a copolymer of a styrene monomer and an acrylic monomer.

The polytetrafluoroethylene contained in the branched polytetrafluoroethylene mixture is branched polytetrafluoroethylene. When the polytetrafluoroethylene contained is not branched polytetrafluoroethylene, the dripping prevention effect when the amount of polytetrafluoroethylene added is small is insufficient. The branched polytetrafluoroethylene is in the form of particles, and preferably has a particle diameter of 0.1 to 0.6 μm, more preferably 0.3 to 0.5 μm, and still more preferably 0.3 to 0.4 μm. When the particle diameter is smaller than 0.1 μm, the surface appearance of the molded article is excellent, but it is difficult to obtain polytetrafluoroethylene having a particle diameter smaller than 0.1 μm commercially. On the other hand, when the particle diameter is larger than 0.6 μm, the surface appearance of the molded product is deteriorated. The number average molecular weight of the polytetrafluoroethylene used in the present invention is preferably 1 × 10 ⁴ to 1 × 10 ⁷ , more preferably 2 × 10 ^{6 to} 9 × 10 ⁶ , and generally a polytetrafluoroethylene having a high molecular weight. Fluoroethylene is more preferred in terms of stability. Either powder or dispersion form may be used.

  The content of the branched polytetrafluoroethylene in the branched polytetrafluoroethylene mixture is preferably 20 to 60 parts by weight, more preferably 40 to 55 parts per 100 parts by weight of the total weight of the branched polytetrafluoroethylene mixture. Parts by weight, more preferably 47 to 53 parts by weight, particularly preferably 48 to 52 parts by weight, and most preferably 49 to 51 parts by weight. When the proportion of the branched polytetrafluoroethylene is within such a range, good dispersibility of the branched polytetrafluoroethylene can be achieved.

  The content of component E is preferably 0.05 to 5 parts by weight, more preferably 0.15 to 2 parts by weight, and still more preferably 0.2 to 1 part by weight with respect to 100 parts by weight of component A. If the content exceeds the above range and is too small, flame retardancy may be insufficient. On the other hand, when the content exceeds the above range, the anti-dripping agent may be deposited on the surface of the molded product, resulting in poor appearance, and the cost of the resin composition is increased, which is not preferable.

(F component: silicate mineral)
The silicate mineral used as the F component of the present invention is a mineral comprising at least a metal oxide component and a SiO ₂ component, and orthosilicate, disilicate, cyclic silicate, chain silicate, and the like are suitable. The silicate mineral of the F component takes a crystalline state, and the shape of the crystal can take various shapes such as a fiber shape and a plate shape.
The F component silicate mineral may be a compound oxide, an oxyacid salt (consisting of an ionic lattice), or a solid solution, and the compound oxide may be a combination of two or more of a single oxide, and a single oxide. Any combination of two or more of a product and an oxyacid salt may be used, and also in a solid solution, any of a solid solution of two or more metal oxides and a solid solution of two or more oxyacid salts Good.

The F component silicate mineral may be a hydrate. The form of crystal water in the hydrate is one that enters as hydrogen silicate ion as Si—OH, one that enters ionically as a hydroxide ion (OH ⁻ ) with respect to the metal cation, and H ₂ O molecules in the gaps in the structure. Any form of entry may be used.
As the F component silicate mineral, an artificial synthetic material corresponding to a natural product can be used. As the artificial compound, silicate minerals obtained from various conventionally known methods, for example, various synthetic methods using solid reaction, hydrothermal reaction, ultrahigh pressure reaction, and the like can be used.

Specific examples of the silicate mineral in each metal oxide component (MO) include the following. Here, the description in parentheses is the name of a mineral or the like mainly composed of such a silicate mineral, and means that the compound in parentheses can be used as the exemplified metal salt.
As those containing K ₂ O in the _{component, K 2 O · SiO 2,} K 2 O · 4SiO 2 · H 2 O, K 2 O · Al 2 O 3 · 2SiO 2 ( _{Karushiraito), K} 2 O · Al ₂ O ₃ · 4SiO ₂ (leucite), and _{K 2 O · Al 2 O 3} · 6SiO 2 ( orthoclase), and the like.

As comprising Na ₂ O in the _component, Na ₂ O · SiO _2, and its _{hydrates, Na 2 O · 2SiO 2,} 2Na 2 O · SiO 2, Na 2 O · 4SiO 2, Na 2 O · 3SiO _{2 · 3H 2 O, Na 2} O · Al 2 O 3 · 2SiO 2, Na 2 O · Al 2 O 3 · 4SiO 2 ( _{jadeite), 2Na 2 O · 3CaO ·} 5SiO 2, 3Na 2 O · 2CaO · 5SiO _2, and _{Na 2 O · Al 2 O 3} · 6SiO 2 ( albite), and the like.

Li ₂ O and as including the components _{thereof, Li 2 O · SiO 2,} 2Li 2 O · SiO 2, Li 2 O · SiO 2 · H 2 O, 3Li 2 O · 2SiO 2, Li 2 O · Al 2 Examples include O ₃ · 4SiO ₂ (petalite), Li ₂ O · Al ₂ O ₃ · 2SiO ₂ (eucryptite), and Li ₂ O · Al ₂ O ₃ · 4SiO ₂ (spodumene).

As those containing BaO into its _components, and the like _{BaO · SiO 2, 2BaO · SiO} 2, BaO · Al 2 O 3 · 2SiO 2 ( celsian), and BaO _· TiO _{2 ·} 3SiO 2 (Bentoaito).

As including CaO its components, 3CaO · _SiO 2 (cement clinker minerals of alite), 2CaO · SiO ₂ (cement clinker minerals of _{belite), 2CaO · MgO · 2SiO 2} ( O Keruma night), 2CaO · Al ₂ O ₃ · SiO ₂ (Gerlenite), solid solution of akermanite and gehlenite (Merilite), CaO · SiO ₂ (wollastonite (including both α-type and β-type)), CaO · MgO · 2SiO _{2 (Jiopusaido), CaO · MgO · SiO 2} ( ash magnesia _{olivine), 3CaO · MgO · 2SiO 2} ( _{Meruuinaito), CaO · Al 2 O 3} · 2SiO 2 ( anorthite), 5CaO · 6SiO ₂ · 5H ₂ O (tobermorite, other 5CaO · 6SiO ₂ · 9H ₂ O, etc. Tobermorite group hydrates such as 2CaO · SiO ₂ · H ₂ O (Hillebrandite), and wollastonite group hydrates such as 6CaO · 6SiO ₂ · H ₂ O (zonotolite) Gyrolite group hydrates such as 2CaO · SiO ₂ · 2H ₂ O (gyrolite), CaO · Al ₂ O ₃ · 2SiO ₂ · H ₂ O (lawsonite), CaO · FeO · 2SiO ₂ (headenite), 3CaO · 2SiO _{2 (Chirukoanaito), 3CaO · Al 2 O 3} · 3SiO 2 ( _{Guroshura), 3CaO · Fe 2 O 3} · 3SiO 2 ( Andhra _{Daito), 6CaO · 4Al 2 O 3} · FeO · SiO 2 ( pleo black Ait ), As well as clinozoite, olivine, olivine, vesuvite, oneolite, Examples include koutite and augite.

Furthermore, Portland cement can be mentioned as a silicate mineral containing CaO as its component. The type of Portland cement is not particularly limited, and any of normal, early strength, ultra-early strength, moderate heat, sulfate resistance, white, and the like can be used. Further, various mixed cements such as blast furnace cement, silica cement, fly ash cement and the like can be used as the F component.
Moreover, blast furnace slag, ferrite, etc. can be mentioned as a silicate mineral which contains other CaO in the component.

As what contains ZnO in its component, ZnO.SiO ₂ , 2ZnO.SiO ₂ (trothite), 4ZnO.2SiO ₂ .H ₂ O (heteropolar ore) and the like can be mentioned.
As including MnO into its _components, such as _{MnO · SiO 2, 2MnO · SiO} 2, CaO · 4MnO · 5SiO 2 ( rhodonite) and Coe write the like.
As the component containing FeO, FeO · SiO ₂ (ferrosilite), 2FeO · SiO ₂ (iron olivine), 3FeO · Al ₂ O ₃ · 3SiO ₂ (almandin), and 2CaO · 5FeO · 8SiO ₂ · H ₂ O (Tetsuakuchinosene) and the like can be mentioned.
Examples of those containing CoO as a component include CoO.SiO ₂ and 2CoO.SiO ₂ .

MgO · SiO ₂ (steatite, enstatite), 2MgO · SiO ₂ (forsterite), 3MgO · Al ₂ O ₃ · 3SiO ₂ (birop), 2MgO · 2Al ₂ O ₃ · 5SiO _{2 (cordierite), 2MgO · 3SiO 2 · 5H} 2 O, 3MgO · 4SiO 2 · H 2 O ( _{talc), 5MgO · 8SiO 2 · 9H} 2 O ( _{attapulgite), 4MgO · 6SiO 2 · 7H} 2 O (Sepiolite), 3MgO · 2SiO ₂ · 2H ₂ O (Chrysolite), 5MgO · 2CaO · 8SiO ₂ · H ₂ O (Translucentite), 5MgO · Al ₂ O ₃ · 3SiO ₂ · 4H ₂ O (Chlorite) _{, K 2 O · 6MgO · Al} 2 O 3 · 6SiO 2 · 2H 2 O ( phlogopite), _Na 2 O · _{MgO · 3Al 2 O 3 · 8SiO} 2 · H 2 O ( melee stone), as well as magnesium tourmaline, linearity stone, Kamintonsen stone, vermiculite, etc. smectite and the like.
As containing Fe ₂ O ₃ on the _component, and a Fe ₂ O 3 · SiO _2.
As those containing ZrO ₂ into its _components, ZrO 2 · SiO ₂ (zircon) and AZS refractory and the like.

As containing Al ₂ O ₃ on the _{component, Al 2 O 3 · SiO 2} ( sillimanite, under-leucite, _{kyanite), 2Al 2 O 3 · SiO} 2, Al 2 O 3 · 3SiO 2, 3Al 2 O 3 2SiO ₂ (mullite), Al ₂ O ₃ · 2SiO ₂ · 2H ₂ O (kaolinite), Al ₂ O ₃ · 4SiO ₂ · H ₂ O (pyrophyllite), Al ₂ O ₃ · 4SiO ₂ · H ₂ O _{(bentonite), K 2 O · 3Na 2} O · 4Al 2 O 3 · 8SiO 2 ( _{nepheline), K 2 O · 3Al 2} O 3 · 6SiO 2 · 2H 2 O ( muscovite, sericite), _{K 2} O.6MgO.Al ₂ O ₃ .6SiO ₂ .2H ₂ O (phlogobite), various zeolites, fluorine phlogopite, biotite, and the like can be given.
Among the silicate minerals, mica, talc, and wollastonite are particularly suitable.

(talc)
In the present invention, talc is hydrous magnesium silicate in terms of chemical composition, generally represented by the chemical formula 4SiO ₂ .3MgO.2H ₂ O, and is usually scaly particles having a layered structure. thereof include a SiO ₂ 56 to 65 wt%, the MgO 28 to 35 wt%, and a _{H 2} O about 5 wt%. As other minor components, Fe ₂ O ₃ is 0.03 to 1.2% by weight, Al ₂ O ₃ is 0.05 to 1.5% by weight, CaO is 0.05 to 1.2% by weight, K ₂ O. Is 0.2 wt% or less, Na ₂ O is 0.2 wt% or less. As for the particle diameter of talc, the average particle diameter measured by the sedimentation method is 0.1 to 15 μm (more preferably 0.2 to 12 μm, still more preferably 0.3 to 10 μm, particularly preferably 0.5 to 5 μm). A range is preferable. Furthermore, it is particularly preferable to use talc having a bulk density of 0.5 (g / cm ³ ) or more as a raw material. The average particle size of talc refers to D50 (median diameter of particle size distribution) measured by an X-ray transmission method which is one of liquid phase precipitation methods. As a specific example of an apparatus for performing such a measurement, Sedigraph 5100 manufactured by Micromeritics Inc. can be cited.

In addition, there is no particular restriction on the manufacturing method when talc is crushed from raw stone, and the axial flow mill method, the annular mill method, the roll mill method, the ball mill method, the jet mill method, the container rotary compression shearing mill method, etc. are used. can do. Further, the talc after pulverization is preferably classified by various classifiers and having a uniform particle size distribution. There are no particular restrictions on the classifier, impactor type inertial force classifier (variable impactor, etc.), Coanda effect type inertial force classifier (elbow jet, etc.), centrifugal field classifier (multistage cyclone, microplex, dispersion separator) , Accucut, Turbo Classifier, Turboplex, Micron Separator, and Super Separator).
Further, talc is preferably in an agglomerated state in view of its handleability and the like, and as such a production method, there are a method by deaeration compression, a method of compression using a sizing agent, and the like. In particular, the degassing compression method is preferable in that the sizing agent resin component which is simple and unnecessary is not mixed into the resin composition of the present invention.

(Mica)
As the mica, those having an average particle diameter measured by a microtrack laser diffraction method of 10 to 100 μm can be preferably used. More preferably, the average particle size is 20 to 50 μm. If the average particle size of mica is less than 10 μm, the effect of improving the rigidity is not sufficient, and if it exceeds 100 μm, the improvement of the rigidity is not sufficient, and the mechanical strength such as impact characteristics is not significantly reduced. Mica having a thickness measured by observation with an electron microscope of 0.01 to 1 μm can be preferably used. More preferably, the thickness is 0.03 to 0.3 μm. The aspect ratio is preferably 5 to 200, more preferably 10 to 100. The mica used is preferably mascobite mica, and its Mohs hardness is about 3. Muscovite mica can achieve higher rigidity and strength than other mica such as phlogopite, and solves the problems of the present invention at a better level. The mica may be pulverized by either dry pulverization or wet pulverization. The dry pulverization method is more inexpensive and more general, but the wet pulverization method is effective for pulverizing mica more thinly and finely, and as a result, the effect of improving the rigidity of the resin composition becomes higher.

(Wollastonite)
The fiber diameter of wollastonite is preferably from 0.1 to 10 μm, more preferably from 0.1 to 5 μm, still more preferably from 0.1 to 3 μm. The aspect ratio (average fiber length / average fiber diameter) is preferably 3 or more. The upper limit of the aspect ratio is 30 or less. Here, the fiber diameter is obtained by observing the reinforcing filler with an electron microscope, obtaining individual fiber diameters, and calculating the number average fiber diameter from the measured values. The electron microscope is used because it is difficult for an optical microscope to accurately measure the size of a target level. For the fiber diameter, for the image obtained by observation with an electron microscope, the filler for which the fiber diameter is to be measured is randomly extracted, the fiber diameter is measured near the center, and the number average fiber is obtained from the obtained measured value. Calculate the diameter. The observation magnification is about 1000 times, and the number of measurement is 500 or more (600 or less is suitable for work). On the other hand, the measurement of average fiber length observes a filler with an optical microscope, calculates | requires individual length, and calculates a number average fiber length from the measured value. Observation with an optical microscope begins with the preparation of a dispersed sample so that the fillers do not overlap each other. Observation is performed under the condition of 20 times the objective lens, and the observed image is taken as image data into a CCD camera having about 250,000 pixels. The obtained image data uses an image analysis device to calculate the fiber length using a program for obtaining the maximum distance between two points of the image data. Under such conditions, the size per pixel corresponds to a length of 1.25 μm, and the number of measurement is 500 or more (600 or less is suitable for work).

The wollastonite of the present invention is a magnetic separator that reflects the iron content mixed in the raw material ore and the iron content mixed due to equipment wear when pulverizing the raw material ore in order to sufficiently reflect the inherent whiteness in the resin composition. It is preferable to remove as much as possible. It is preferable that the iron content in wollastonite is 0.5% by weight or less in terms of Fe ₂ O ₃ by such magnetic separator processing.

Silicate minerals (more preferably mica, talc, wollastonite) are preferably not surface-treated, but are surface-treated with various surface treatment agents such as silane coupling agents, higher fatty acid esters, and waxes. It may be. Furthermore, it may be granulated with a sizing agent such as various resins, higher fatty acid esters, and waxes.
The content of component F is preferably 0.1 to 5 parts by weight, more preferably 0.2 to 3.5 parts by weight, and still more preferably 0.3 to 3 parts by weight with respect to 100 parts by weight of component A. Parts by weight. When the content of the F component is less than 0.1 part by weight, the flame retardancy of the molded product may be insufficient. When the content exceeds 5 parts by weight, the impact resistance of the molded product in supercritical fine foam molding is reduced. It may be insufficient.

(Other additives)
(I) Phosphorus stabilizer Examples of the phosphorous stabilizer include phosphorous acid, phosphoric acid, phosphonous acid, phosphonic acid and esters thereof, and tertiary phosphine.
Specifically, as the phosphite compound, for example, triphenyl phosphite, tris (nonylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite, dioctyl monophenyl Phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, tris (diethylphenyl) phosphite, tris (di-iso-propylphenyl) phosphite, tris (di -N-butylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tris (2,6-di-tert-butylphenyl) phosphite, dis Allyl pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-ethylphenyl) pentaerythritol diphosphite, bis {2,4-bis (1-methyl-1-phenylethyl) phenyl} pentaerythritol diphosphite, phenylbisphenol A Examples include pentaerythritol diphosphite, bis (nonylphenyl) pentaerythritol diphosphite, and dicyclohexyl pentaerythritol diphosphite.

  Further, as other phosphite compounds, those which react with dihydric phenols and have a cyclic structure can be used. For example, 2,2′-methylenebis (4,6-di-tert-butylphenyl) (2,4-di-tert-butylphenyl) phosphite, 2,2′-methylenebis (4,6-di-tert- Examples include butylphenyl) (2-tert-butyl-4-methylphenyl) phosphite and 2,2-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite.

  Examples of the phosphate compound include tributyl phosphate, trimethyl phosphate, tricresyl phosphate, triphenyl phosphate, trichlorophenyl phosphate, triethyl phosphate, diphenyl cresyl phosphate, diphenyl monoorxenyl phosphate, tributoxyethyl phosphate, dibutyl phosphate, dioctyl phosphate, Examples thereof include diisopropyl phosphate, and triphenyl phosphate and trimethyl phosphate are preferable.

  Examples of the phosphonite compound include tetrakis (2,4-di-tert-butylphenyl) -4,4′-biphenylenediphosphonite, tetrakis (2,4-di-tert-butylphenyl) -4,3′-biphenylenedi. Phosphonite, tetrakis (2,4-di-tert-butylphenyl) -3,3′-biphenylenediphosphonite, tetrakis (2,6-di-tert-butylphenyl) -4,4′-biphenylenediphosphonite Tetrakis (2,6-di-tert-butylphenyl) -4,3′-biphenylene diphosphonite, tetrakis (2,6-di-tert-butylphenyl) -3,3′-biphenylene diphosphonite, bis (2,4-di-tert-butylphenyl) -4-phenyl-phenylphosphonite, bis (2,4-di tert-butylphenyl) -3-phenyl-phenylphosphonite, bis (2,6-di-n-butylphenyl) -3-phenyl-phenylphosphonite, bis (2,6-di-tert-butylphenyl)- 4-phenyl-phenylphosphonite, bis (2,6-di-tert-butylphenyl) -3-phenyl-phenylphosphonite, and the like, and tetrakis (di-tert-butylphenyl) -biphenylenediphosphonite, bis (Di-tert-butylphenyl) -phenyl-phenylphosphonite is preferred, tetrakis (2,4-di-tert-butylphenyl) -biphenylenediphosphonite, bis (2,4-di-tert-butylphenyl)- More preferred is phenyl-phenylphosphonite. Such a phosphonite compound is preferable because it can be used in combination with a phosphite compound having an aryl group in which two or more alkyl groups are substituted.

  Examples of the phosphonate compound include dimethyl benzenephosphonate, diethyl benzenephosphonate, and dipropyl benzenephosphonate.

  Tertiary phosphine includes triethylphosphine, tripropylphosphine, tributylphosphine, trioctylphosphine, triamylphosphine, dimethylphenylphosphine, dibutylphenylphosphine, diphenylmethylphosphine, diphenyloctylphosphine, triphenylphosphine, tri-p-tolyl. Examples include phosphine, trinaphthylphosphine, and diphenylbenzylphosphine. A particularly preferred tertiary phosphine is triphenylphosphine.

  The phosphorus stabilizers can be used alone or in combination of two or more. Among the phosphorus stabilizers, phosphonite compounds or phosphite compounds represented by the following general formula (2) are preferable.

(In formula (2), R and R ′ represent an alkyl group having 6 to 30 carbon atoms or an aryl group having 6 to 30 carbon atoms, and may be the same or different from each other.)

  As described above, tetrakis (2,4-di-tert-butylphenyl) -biphenylenediphosphonite is preferable as the phosphonite compound, and the stabilizer containing phosphonite as a main component is Sandostab P-EPQ (trademark, manufactured by Clariant). ) And Irgafos P-EPQ (trademark, manufactured by CIBA SPECIALTY CHEMICALS) and both can be used.

  Among the above formulas (2), more preferred phosphite compounds are distearyl pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di). -Tert-butyl-4-methylphenyl) pentaerythritol diphosphite, and bis {2,4-bis (1-methyl-1-phenylethyl) phenyl} pentaerythritol diphosphite.

  Distearyl pentaerythritol diphosphite is commercially available as ADK STAB PEP-8 (trademark, manufactured by Asahi Denka Kogyo Co., Ltd.) and JPP681S (trademark, manufactured by Johoku Chemical Industry Co., Ltd.), and any of them can be used. Bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite is ADK STAB PEP-24G (trademark, manufactured by Asahi Denka Kogyo Co., Ltd.), Alkanox P-24 (trademark, manufactured by Great Lakes), Ultranox. P626 (trademark, manufactured by GE Specialty Chemicals), Doverphos S-9432 (trademark, manufactured by Dover Chemical), and Irgafos126 and 126FF (trademark, manufactured by CIBA SPECIALTY CHEMICALS) are also available. Bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite is commercially available as ADK STAB PEP-36 (trademark, manufactured by Asahi Denka Kogyo Co., Ltd.) and can be easily used. Further, bis {2,4-bis (1-methyl-1-phenylethyl) phenyl} pentaerythritol diphosphite is produced by ADK STAB PEP-45 (trademark, manufactured by Asahi Denka Kogyo Co., Ltd.) and Doverphos S-9228 (trademark). , Manufactured by Dober Chemical Co.) and any of them can be used.

(Ii) Hindered phenolic antioxidant As the hindered phenolic compound, various compounds that are usually blended in a resin can be used. Examples of such hindered phenol compounds include α-tocopherol, butylhydroxytoluene, sinapyl alcohol, vitamin E, octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 2-tert -Butyl-6- (3'-tert-butyl-5'-methyl-2'-hydroxybenzyl) -4-methylphenyl acrylate, 2,6-di-tert-butyl-4- (N, N-dimethylamino) Methyl) phenol, 3,5-di-tert-butyl-4-hydroxybenzylphosphonate diethyl ester, 2,2'-methylenebis (4-methyl-6-tert-butylphenol), 2,2'-methylenebis (4-ethyl) -6-tert-butylphenol), 4,4'-methylenebis (2,6 Di-tert-butylphenol), 2,2′-methylenebis (4-methyl-6-cyclohexylphenol), 2,2′-dimethylene-bis (6-α-methyl-benzyl-p-cresol), 2,2 ′ -Ethylidene-bis (4,6-di-tert-butylphenol), 2,2'-butylidene-bis (4-methyl-6-tert-butylphenol), 4,4'-butylidenebis (3-methyl-6-tert) -Butylphenol), triethylene glycol-N-bis-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate, 1,6-hexanediol bis [3- (3,5-di- tert-butyl-4-hydroxyphenyl) propionate], bis [2-tert-butyl-4-methyl 6- (3-tert-butyl) Ru-5-methyl-2-hydroxybenzyl) phenyl] terephthalate, 3,9-bis {2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1- Dimethylethyl} -2,4,8,10-tetraoxaspiro [5,5] undecane, 4,4′-thiobis (6-tert-butyl-m-cresol), 4,4′-thiobis (3-methyl) -6-tert-butylphenol), 2,2'-thiobis (4-methyl-6-tert-butylphenol), bis (3,5-di-tert-butyl-4-hydroxybenzyl) sulfide, 4,4'- Di-thiobis (2,6-di-tert-butylphenol), 4,4′-tri-thiobis (2,6-di-tert-butylphenol), 2,2-thiodiethyl Bis- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 2,4-bis (n-octylthio) -6- (4-hydroxy-3,5-di-tert- Butylanilino) -1,3,5-triazine, N, N′-hexamethylenebis- (3,5-di-tert-butyl-4-hydroxyhydrocinnamide), N, N′-bis [3- (3 , 5-Di-tert-butyl-4-hydroxyphenyl) propionyl] hydrazine, 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1,3,5-trimethyl -2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, tris (3,5-di-tert-butyl-4-hydroxyphenyl) isocyanate Anurate, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris (4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate, 1,3,5-tris2 [3 (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl isocyanurate, tetrakis [methylene-3- (3,5-di-tert-butyl- 4-hydroxyphenyl) propionate] methane, triethylene glycol-N-bis-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate, triethylene glycol-N-bis-3- (3- tert-butyl-4-hydroxy-5-methylphenyl) acetate, 3,9-bis [2- 3- (3-tert-butyl-4-hydroxy-5-methylphenyl) acetyloxy} -1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5,5] undecane, tetrakis [ Methylene-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate] methane, 1,3,5-trimethyl-2,4,6-tris (3-tert-butyl-4-hydroxy- Examples include 5-methylbenzyl) benzene and tris (3-tert-butyl-4-hydroxy-5-methylbenzyl) isocyanurate.

  Among the above compounds, tetrakis [methylene-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate] methane, octadecyl-3- (3,5-di-tert-butyl-) is used in the present invention. 4-hydroxyphenyl) propionate, and 3,9-bis [2- {3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4 , 8,10-Tetraoxaspiro [5,5] undecane is preferably used. In particular, 3,9-bis [2- {3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4,8,10-tetraoxa Spiro [5,5] undecane is preferred. The said hindered phenolic antioxidant can be used individually or in combination of 2 or more types.

  Either of the phosphorus stabilizer and the hindered phenol antioxidant is preferably blended, and the combination of these is more preferred. The amount of phosphorus stabilizer and hindered phenol antioxidant is preferably 0.001 to 3 parts by weight, more preferably 0.005 to 2 parts by weight, and still more preferably 100 parts by weight of component A. 0.01 to 1 part by weight. In the case of combined use, 0.01 to 0.3 parts by weight of a phosphorus stabilizer and 0.01 to 0.3 parts by weight of a hindered phenol antioxidant may be blended with 100 parts by weight of component A. More preferred.

(Iii) Release agent It is preferable to add a release agent to the resin composition of the present invention for the purpose of improving productivity at the time of molding and reducing distortion of the molded product. Known release agents can be used. For example, saturated fatty acid ester, unsaturated fatty acid ester, polyolefin wax (polyethylene wax, 1-alkene polymer, etc., which may be modified with a functional group-containing compound such as acid modification), silicone compound, fluorine compound ( And fluorine oil represented by polyfluoroalkyl ether), paraffin wax, beeswax and the like. Among these, fatty acid esters are preferable as a release agent. Such fatty acid esters are esters of aliphatic alcohols and aliphatic carboxylic acids. Such an aliphatic alcohol may be a monohydric alcohol or a dihydric or higher polyhydric alcohol. Moreover, as carbon number of this alcohol, it is the range of 3-32, More preferably, it is the range of 5-30. Examples of such monohydric alcohols include dodecanol, tetradecanol, hexadecanol, octadecanol, eicosanol, tetracosanol, seryl alcohol, and triacontanol. Examples of such polyhydric alcohols include pentaerythritol, dipentaerythritol, tripentaerythritol, polyglycerol (triglycerol to hexaglycerol), ditrimethylolpropane, xylitol, sorbitol, and mannitol. In the fatty acid ester of the present invention, a polyhydric alcohol is more preferable.

  On the other hand, the aliphatic carboxylic acid preferably has 3 to 32 carbon atoms, and particularly preferably an aliphatic carboxylic acid having 10 to 22 carbon atoms. Examples of the aliphatic carboxylic acid include decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid (palmitic acid), heptadecanoic acid, octadecanoic acid (stearic acid), nonadecanoic acid, behenic acid, Mention may be made of saturated aliphatic carboxylic acids such as icosanoic acid and docosanoic acid, and unsaturated aliphatic carboxylic acids such as palmitoleic acid, oleic acid, linoleic acid, linolenic acid, eicosenoic acid, eicosapentaenoic acid, and cetreic acid . Among the above, aliphatic carboxylic acids having 14 to 20 carbon atoms are preferable. Of these, saturated aliphatic carboxylic acids are preferred. In particular, stearic acid and palmitic acid are preferred.

  The above aliphatic carboxylic acids such as stearic acid and palmitic acid are usually produced from natural fats and oils such as animal fats such as beef tallow and lard and vegetable oils such as palm oil and sunflower oil. Therefore, these aliphatic carboxylic acids are usually a mixture containing other carboxylic acid components having different numbers of carbon atoms. Accordingly, in the production of the fatty acid ester of the present invention, aliphatic carboxylic acids produced from such natural fats and oils and in the form of a mixture containing other carboxylic acid components, particularly stearic acid and palmitic acid are preferably used.

  The fatty acid ester of the present invention may be either a partial ester or a total ester (full ester). However, partial esters are more preferably full esters because they usually have a high hydroxyl value and tend to induce decomposition of the resin at high temperatures. The acid value in the fatty acid ester of the present invention is preferably 20 or less, more preferably 4 to 20 and even more preferably 4 to 12 from the viewpoint of thermal stability. The acid value can be substantially zero. The hydroxyl value of the fatty acid ester is more preferably in the range of 0.1-30. Further, the iodine value is preferably 10 or less. The iodine value can be substantially zero. These characteristics can be obtained by a method defined in JIS K 0070.

  The content of the release agent is preferably 0.005 to 2 parts by weight, more preferably 0.01 to 1 part by weight, still more preferably 0.05 to 0.5 parts by weight with respect to 100 parts by weight of component A. It is. In such a range, the resin composition has good release properties and roll release properties. In particular, such an amount of fatty acid ester provides a resin composition having good release properties and roll release properties without impairing good hue.

(Iv) Ultraviolet Absorber The resin composition of the present invention can contain an ultraviolet absorber. Since the resin composition of the present invention is excellent in transparency, it is very suitable for use in transmitting light.
In the benzophenone series, for example, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2-hydroxy-4-methoxy- 5-sulfoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfoxytrihydridolate benzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone, 2 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxy-5-sodiumsulfoxybenzophenone, bis (5-benzoyl-4-hydroxy-2-methoxyphenyl) ) Methane, 2-hydroxy Examples include -4-n-dodecyloxybenzophenone and 2-hydroxy-4-methoxy-2'-carboxybenzophenone.

  In the benzotriazole series, for example, 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, 2- (2-hydroxy-3, 5-Dicumylphenyl) phenylbenzotriazole, 2- (2-hydroxy-3-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, 2,2′-methylenebis [4- (1,1,3 , 3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol], 2- (2-hydroxy-3,5-di-tert-butylphenyl) benzotriazole, 2- (2- Hydroxy-3,5-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-3,5 Di-tert-amylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-butylphenyl) benzotriazole, 2- ( 2-hydroxy-4-octoxyphenyl) benzotriazole, 2,2'-methylenebis (4-cumyl-6-benzotriazolephenyl), 2,2'-p-phenylenebis (1,3-benzoxazine-4 -One), and 2- [2-hydroxy-3- (3,4,5,6-tetrahydrophthalimidomethyl) -5-methylphenyl] benzotriazole, and 2- (2'-hydroxy-5-methacryloxy) Copolymerization of ethylphenyl) -2H-benzotriazole with vinyl monomer copolymerizable with the monomer And 2- (2′-hydroxy-5-acryloxyethylphenyl) -2H-benzotriazole and a copolymer of vinyl monomer copolymerizable with the monomer, 2-hydroxyphenyl-2H-benzotriazole skeleton A polymer having

  In the hydroxyphenyl triazine series, for example, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-hexyloxyphenol, 2- (4,6-diphenyl-1,3,5) -Triazin-2-yl) -5-methyloxyphenol, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-ethyloxyphenol, 2- (4,6-diphenyl) -1,3,5-triazin-2-yl) -5-propyloxyphenol and 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-butyloxyphenol Illustrated. Furthermore, the phenyl group of the above exemplary compounds such as 2- (4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl) -5-hexyloxyphenol is 2,4-dimethyl. Examples of the compound are phenyl groups.

In the cyclic imino ester system, for example, 2,2′-p-phenylenebis (3,1-benzoxazin-4-one), 2,2 ′-(4,4′-diphenylene) bis (3,1-benzoxazine) -4-one), 2,2 ′-(2,6-naphthalene) bis (3,1-benzoxazin-4-one), and the like.
In the case of cyanoacrylate, for example, 1,3-bis-[(2′-cyano-3 ′, 3′-diphenylacryloyl) oxy] -2,2-bis [(2-cyano-3,3-diphenylacryloyl) oxy ] Methyl) propane, 1,3-bis-[(2-cyano-3,3-diphenylacryloyl) oxy] benzene and the like.

  Further, the ultraviolet absorber has a structure of a monomer compound capable of radical polymerization, whereby the ultraviolet-absorbing monomer and / or the light-stable monomer having a hindered amine structure, and an alkyl (meth) acrylate. A polymer type ultraviolet absorber obtained by copolymerization with a monomer such as may be used. Preferred examples of the UV-absorbing monomer include compounds containing a benzotriazole skeleton, a benzophenone skeleton, a triazine skeleton, a cyclic imino ester skeleton, and a cyanoacrylate skeleton in the ester substituent of (meth) acrylate. The

Of these, benzotriazoles and hydroxyphenyltriazines are preferred in terms of ultraviolet absorption, and cyclic iminoesters and cyanoacrylates are preferred in terms of heat resistance and hue (transparency). You may use the said ultraviolet absorber individually or in mixture of 2 or more types.
The content of the ultraviolet absorber is preferably 0.01 to 2 parts by weight, more preferably 0.02 to 2 parts by weight, still more preferably 0.03 to 1 part by weight, particularly 100 parts by weight of the component A. Preferably it is 0.05-0.5 weight part.

(V) Dye / pigment The resin composition of the present invention can further contain various dyes / pigments and can provide molded products that exhibit various design properties. Since the resin composition of the present invention is excellent in transparency, it is very suitable for use in transmitting light. Therefore, for example, by adding a fluorescent brightening agent, the resin composition of the present invention is given higher light transmittance and natural transparency, and a fluorescent brightening agent or other fluorescent dye that emits light is added. By doing so, the further better design effect which utilized the luminescent color can be provided. Also, a resin composition which is delicately colored with a very small amount of dye and pigment and has high transparency can also be provided.

  Examples of the fluorescent dye (including a fluorescent brightening agent) used in the present invention include a coumarin fluorescent dye, a benzopyran fluorescent dye, a perylene fluorescent dye, an anthraquinone fluorescent dye, a thioindigo fluorescent dye, and a xanthene fluorescent dye. And xanthone fluorescent dyes, thioxanthene fluorescent dyes, thioxanthone fluorescent dyes, thiazine fluorescent dyes, and diaminostilbene fluorescent dyes. Among these, coumarin fluorescent dyes, benzopyran fluorescent dyes, and perylene fluorescent dyes are preferable because they have good heat resistance and little deterioration during molding of the polycarbonate resin.

Examples of dyes other than the above bluing agents and fluorescent dyes include perylene dyes, coumarin dyes, thioindigo dyes, anthraquinone dyes, thioxanthone dyes, ferrocyanides such as bitumen, perinone dyes, quinoline dyes, quinacridone And dyes such as dyes, dioxazine dyes, isoindolinone dyes, and phthalocyanine dyes. Furthermore, the resin composition of this invention can mix | blend a metallic pigment, and can also obtain a better metallic color. As the metallic pigment, those having a metal film or a metal oxide film on various plate-like fillers are suitable.
The content of the dye / pigment is preferably 0.00001 to 1 part by weight and more preferably 0.00005 to 0.5 part by weight with respect to 100 parts by weight of the component A.

(Vi) Other Heat Stabilizers The resin composition of the present invention may contain other heat stabilizers other than the above phosphorus stabilizers and hindered phenol antioxidants. Such other heat stabilizers are preferably used in combination with any of these stabilizers and antioxidants, and particularly preferably used in combination with both. Examples of such other heat stabilizers include lactone stabilizers represented by a reaction product of 3-hydroxy-5,7-di-tert-butyl-furan-2-one and o-xylene (such stabilizers). Is described in detail in JP-A-7-233160). Such a compound is commercially available as Irganox HP-136 (trademark, manufactured by CIBA SPECIALTY CHEMICALS) and can be used. Furthermore, a stabilizer obtained by mixing the compound with various phosphite compounds and hindered phenol compounds is commercially available. For example, Irganox HP-2921 manufactured by the above company is preferably exemplified. In the present invention, such a premixed stabilizer can also be used. The blending amount of the lactone stabilizer is preferably 0.0005 to 0.05 parts by weight, more preferably 0.001 to 0.03 parts by weight with respect to 100 parts by weight of the component A.

  Other stabilizers include sulfur-containing stabilizers such as pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-laurylthiopropionate), and glycerol-3-stearylthiopropionate. Illustrated. Such a stabilizer is particularly effective when the resin composition is applied to rotational molding. The amount of the sulfur-containing stabilizer is preferably 0.001 to 0.1 parts by weight, more preferably 0.01 to 0.08 parts by weight, with respect to 100 parts by weight of component A.

(Manufacture of resin composition)
The resin composition of the present invention can be produced by mixing the above-mentioned components simultaneously or in any order with a mixer such as a tumbler, V-type blender, nauter mixer, Banbury mixer, kneading roll, or extruder. . Preferably, melt kneading with a twin-screw extruder is preferred, and if necessary, it is preferable to supply an optional component into the other melt-mixed component from the second supply port using a side feeder or the like.

  The resin extruded as described above is directly cut into pellets, or after forming strands, the strands are cut with a pelletizer to be pelletized. When it is necessary to reduce the influence of external dust during pelletization, it is preferable to clean the atmosphere around the extruder. Although the shape of the obtained pellet can take general shapes, such as a cylinder, a prism, and a spherical shape, it is more preferably a cylinder. The diameter of such a cylinder is preferably 1 to 5 mm, more preferably 1.5 to 4 mm, and still more preferably 2 to 3.5 mm. On the other hand, the length of the cylinder is preferably 1 to 30 mm, more preferably 2 to 5 mm, and still more preferably 2.5 to 4 mm.

(About supercritical foam molding)
The resin composition comprises a check ring (hereinafter referred to as an intermediate ring) in the middle part of the screw, a supercritical gas inlet between the three-tip set and the intermediate ring, and a supercritical gas generation and injection device as an external device. In the installed injection molding machine, pellets are introduced from the hopper port, heated and melted in the conveyance zone and compression zone of the molding machine screw, and then nitrogen or carbon dioxide from the dedicated gas injection port provided in the heating cylinder in the measurement zone. Supercritical foam molding is performed by introducing a supercritical gas of carbon. In such supercritical foam molding, by adopting injection compression molding, injection press molding, and core back molding as necessary on the mold control side, not only the injection amount of the supercritical gas but also the foaming ratio can be set. It is possible to control. As the mold runner, either the cold runner method or the hot runner method can be selected, but the latter hot runner method is preferable in terms of easy control of the expansion ratio. Further, as the nozzle of the molding machine, either an open nozzle or a shut-off valve can be used, but the latter shut-off valve is preferable when the mold does not have a shut-off function.

(About molded products)
Various types of surface treatment can be performed on the molded article of the present invention. As the surface treatment, various surface treatments such as a hard coat, a water / oil repellent coat, a hydrophilic coat, an antistatic coat, an ultraviolet absorption coat, an infrared absorption coat, and metalizing (evaporation) can be performed. Examples of the surface treatment method include liquid deposition, vapor deposition, thermal spraying, and plating. As the vapor deposition method, either a physical vapor deposition method or a chemical vapor deposition method can be used. Examples of physical vapor deposition include vacuum vapor deposition, sputtering, and ion plating. Examples of the chemical vapor deposition (CVD) method include a thermal CVD method, a plasma CVD method, and a photo CVD method.
Moreover, in order to give the external appearance of the molded product of the present invention, various insert moldings are possible, and examples include film insert molding and in-mold molding.

  The present invention provides a resin composition for supercritical foam molding excellent in impact resistance in the molding process of a foam molded article by physical foaming using a supercritical fluid, and the industrial effect exhibited by the present invention is exceptional. Is.

  The form of the present invention considered to be the best by the present inventor is a collection of the preferable ranges of the above requirements. For example, typical examples are described in the following examples. Of course, the present invention is not limited to these forms.

The present invention will be further described below with reference to examples, but the present invention is not limited thereto. The following items were evaluated.
(I) Charpy impact strength According to ISO 179, the Charpy impact strength with a notch was measured using the test piece created by the following method. The Charpy impact strength is required to be 15 kJ / m ² or more in a molded article with a weight reduction rate of 10% using supercritical foam molding, and the retention calculated by the following formula is 50% or more.
Retention rate (%) = [Charpy impact strength of supercritical foam molded product (weight reduction rate 10%) / Charpy impact strength during normal molding] × 100
(Ii) Flowability An Archimedean spiral flow length having a channel thickness of 2 mm and a channel width of 8 mm was measured with an injection molding machine [SG150U manufactured by Sumitomo Heavy Industries, Ltd.]. The measurement was performed at a cylinder temperature of 260 ° C., a mold temperature of 70 ° C., and an injection pressure of 98 MPa.
(Iii) Flame retardancy For those to which D component was added, a V combustion test was carried out at a thickness of 1.5 mm in accordance with UL94 standard using a test piece prepared by the following method. It should be noted that “not” is indicated when the determination fails to satisfy any of the criteria of V-0, V-1, and V-2.

[Examples 1 to 25, Comparative Examples 1 to 3]
The mixture which consists of a component except the B component and D component with the composition shown in Table 1 and Table 2 was supplied from the 1st supply port of the extruder. Such a mixture was obtained by mixing the following premix (i) with other components using a V-type blender. That is, (i) a mixture of an E component (anti-dripping agent) and an A component aromatic polycarbonate resin, the entire bag being shaken in a polyethylene bag so that the E component is 2.5% by weight. A uniformly mixed mixture. Component B was supplied from the second supply port using a side feeder. Furthermore, when adding D component, in the state heated at 80 degreeC, the 3rd supply port (1st supply port and vent) in the middle of a cylinder using a liquid injection apparatus (HYM-JS-08 by Fuji Techno Industry Co., Ltd.). From the position between the exhaust port and the exhaust port, each was supplied to the extruder at a predetermined ratio. The liquid injection device was set to supply a constant amount, and the supply amounts of other raw materials were precisely measured with a measuring instrument [CWF manufactured by Kubota Corporation]. Extrusion is performed by using a vent type twin screw extruder (Nippon Steel Works TEX30α-38.5BW-3V) with a diameter of 30 mmφ, melt kneading at a screw speed of 150 rpm, a discharge rate of 20 kg / h, and a vent vacuum of 3 kPa. Pellets were obtained. In addition, about extrusion temperature, it implemented at 260 degreeC from the 1st supply port to the die part.

  Part of the obtained pellets was dried in a hot air circulating drier at 100 ° C. for Examples 1 to 11 and Comparative Examples 1 to 3 and at 80 ° C. for Examples 12 to 25, and then injection molded. The test piece for evaluation (ISO179, UL94 compliant) was molded using a machine. In particular, for test pieces for measuring ISO 179 Charpy impact strength, in addition to a normal injection molding machine, a MuCell molding injection molding machine (JSW J140AD-110H) was used, and the amount of supercritical fluid nitrogen was 0.3%. A molded product having a weight reduction rate of 10% was produced by injection molding. Further, the cylinder temperature and the mold temperature were molded at the temperatures described in Tables 1 and 2.

In addition, the following were used as a raw material.
(A component)
A-1: Aromatic polycarbonate resin [manufactured by Teijin Limited: Panlite L-1225WP (trade name), aromatic polycarbonate resin powder having a viscosity average molecular weight of 22,500 made from bisphenol A and phosgene by a conventional method]
A-2: Polycarbonate-polydiorganosiloxane copolymer resin (viscosity average molecular weight 19,800, PDMS amount 8.4%, PDMS polymerization degree 37)
(B component)
B-1: Core-shell graft copolymer [Mitsubishi Rayon Co., Ltd .: Metabrene S-2001 (trade name), number average particle size 200 nm]
B-2: Core-shell graft copolymer [Mitsubishi Rayon Co., Ltd. product: Metabrene W-450 (trade name), number average particle diameter 180 nm]
B-3: Core-shell graft copolymer [Mitsubishi Rayon Co., Ltd .: Metabrene S-2101 (trade name), number average particle diameter 600 nm]
(C component)
C-1: ABS resin [manufactured by Nippon A & L Co., Ltd., Clarastic SXH-330 (trade name), butadiene rubber component of about 17.5% by weight, weight average rubber particle size of 0.40 μm, manufactured by emulsion polymerization, lubricant (Excluding EBS)]
C-2: ABS resin [manufactured by Nippon A & L Co., Ltd., Clarastic GA-704 (trade name), butadiene rubber component about 17.5 wt%, weight average rubber particle size 0.40 μm, manufactured by emulsion polymerization, lubricant (Including EBS)]
C-3: ABS resin [Santac AT-07 (trade name) manufactured by Japan A & L Co., Ltd., butadiene rubber component about 17.5% by weight, weight average rubber particle size 1.2 μm, manufactured by bulk polymerization, lubricant ( Does not include EBS)]
(D component)
D-1: Phosphate ester mainly composed of bisphenol A bis (diphenyl phosphate) [manufactured by Daihachi Chemical Industry Co., Ltd .: CR-741 (trade name)]
(E component)
E-1: Polytetrafluoroethylene having fibril-forming ability [Daikin Industries, Ltd .: Polyflon MPA FA500 (trade name)]
E-2: SN3300B7 (trade name) (manufactured by Shine Polymer, the polytetrafluoroethylene-based mixture is a mixture of branched polytetrafluoroethylene particles and styrene-acrylonitrile copolymer particles produced by suspension polymerization. (Polytetrafluoroethylene content 50% by weight))
(F component)
F-1: Talc (manufactured by Hayashi Kasei Co., Ltd .; HST0.8 (trade name), average particle size 3.5 μm)
F-2: Wollastonite (manufactured by NYCO: NYGLOS4)
F-3: Mica (Kinsei Matec Co., Ltd .: Mica powder MT-200B)
(Other ingredients)
G-1: Fatty acid ester release agent (Riken Vitamin Co., Ltd .; Riquemar SL900 (trade name))
G-2: Phenol heat stabilizer (Ciba Specialty Chemicals KK; IRGANOX 1076 (trade name))
G-3: Phosphite heat stabilizer (Ciba Specialty Chemicals KK; IRGAFOS 168 (trade name))
G-4: Olefin-based wax by copolymerization of α-olefin and maleic anhydride (Mitsubishi Chemical Corporation; Diacarna 30M (trade name))

  As apparent from the above table, (A) vinyl polymer composed of one or more vinyl monomer units in (B) acrylic rubber with respect to 100 parts by weight of aromatic polycarbonate resin (component A). Is a graft copolymer obtained by graft polymerization of a graft copolymer obtained by graft polymerization and / or a vinyl polymer composed of one or more vinyl monomer units on an acrylic-silicone composite rubber. By containing 1.5 to 10 parts by weight of the graft copolymer (component B) having a diameter of 500 nm or less, it has excellent impact resistance in foam molding, for office machines, household appliances, electrical and electronic equipment, and vehicles. A resin composition suitable for a molded article was obtained.

Claims (8)

  (A) Graft copolymer obtained by graft-polymerizing vinyl polymer composed of one or more vinyl monomer units to (B) acrylic rubber with respect to 100 parts by weight of aromatic polycarbonate resin (component A) A graft copolymer obtained by graft-polymerizing a vinyl polymer composed of one or more types of vinyl monomer units to a polymer and / or acrylic-silicone composite rubber, and having a number average particle diameter of 500 nm or less Thermoplastic resin composition for supercritical foam molding containing 1.5 to 6 parts by weight of graft copolymer (component B) and not containing a polylactic acid resin and / or a copolymer of lactic acid and other hydroxycarboxylic acid object.   The thermoplastic resin composition for supercritical foam molding according to claim 1, comprising 5 to 100 parts by weight of a styrene resin (component C) other than the component (C) B with respect to 100 parts by weight of the component A.   The thermoplastic resin composition for supercritical foam molding according to claim 1 or 2, comprising 3 to 35 parts by weight of (D) a phosphorus flame retardant (D component) with respect to 100 parts by weight of component A.   The supercritical of any one of Claims 1-3 which contains 0.05-5 weight part of (E) fluorine-containing anti-dripping agents (E component) which have fibril formation ability with respect to 100 weight part of A component. A thermoplastic resin composition for foam molding.   The thermoplastic resin for supercritical foam molding according to any one of claims 1 to 4, comprising 0.1 to 5 parts by weight of (F) silicate mineral (F component) with respect to 100 parts by weight of component A. Composition.   The thermoplastic resin composition for supercritical foam molding according to claim 5, wherein the F component is talc.   The supercritical fluid used for supercritical foam molding is nitrogen, The thermoplastic resin composition for supercritical foam molding of any one of Claims 1-6.   A foam molded article comprising the thermoplastic resin composition for supercritical foam molding according to any one of claims 1 to 7.