JP5367902B2 - Resin composite material, dental material, and method for producing resin composite material - Google Patents

Description

  The present invention relates to a resin composite material, a dental material, and a method for producing a resin composite material.

  Thermoplastic resins are used in a wide range of fields such as electrical, electronic, and office automation equipment, vehicles, building materials, agricultural materials, and miscellaneous goods because they are excellent in mechanical properties, electrical properties, light weight, and moldability. . Furthermore, as a method for improving the rigidity, strength, dimensional characteristics, etc. of the thermoplastic resin, it is generally performed to contain an inorganic filler. On the other hand, a composite property of a thermoplastic resin and an inorganic filler generally improves the intended physical properties, but conversely causes sacrificed physical properties.

  Generally, resin materials (plastics) are roughly classified into thermoplastic resins and thermosetting resins. A thermoplastic resin is a resin that softens and melts when heated and can be deformed into any shape by stress, and is applied in many fields because of its ease of workability and high productivity. On the other hand, the thermosetting resin becomes a network polymer after molding, so it is not softened by heating, and the product is highly stable, but the productivity is poor. For this reason, thermosetting resins are not applied as much as thermoplastic resins in the industry. In addition, since thermosetting resins are difficult to reprocess when a crosslinked structure is formed, precursors such as polymerizable monomers are often used as products. For example, as a precursor material of a resin composite material in which fillers such as inorganic particles are dispersed in a resin matrix, various kinds of fillers surface-treated with a silane coupling agent or the like are added to a polymerizable monomer. A composite composition has been proposed (Patent Documents 1 to 4, etc.). In these composite compositions, the compatibility between the polymerizable monomer and the filler is improved, the operability is ensured by suppressing the thixotropic property of the composite composition, or the dispersibility of the filler in the polymerizable monomer is improved. Surface treatment for the filler is performed for the purpose of improvement. These composite compositions are prepared by surface-treating a filler and then mixing with a polymerizable monomer. When used, the composite composition is polymerized and cured to obtain a resin composite material. Such surface treatment has become more important from the viewpoint of controlling the surface of nanoparticles having a large specific surface area against the background of recent developments in nanotechnology.

  As for a resin composite material using a thermoplastic resin, a method is known in which a filler is directly mixed with a heat-melted resin. For example, a resin composite material including 5 to 50 parts by mass of a filler surface-treated with an organosilicon compound with respect to 100 parts by mass of a total amount of a thermoplastic polyimide resin and a polyaryl ketone resin has been proposed (Patent Document 5). . In this resin composite material, the surface treatment agent (organosilicon compound) undergoes some chemical change under high-temperature melt-kneading conditions, and the surface condition acts to increase the affinity for the resin. It is said that the effect of not significantly changing the hue even when exposed to a heat treatment for a long time is high.

  There has also been proposed a method in which a filler and a molten elastomer or resin are stirred while applying a shearing force with a rotating screw to obtain a melt-kneaded product (Patent Document 6). In order to uniformly disperse nano-level fillers, the invention described in Patent Document 6 is (1) an approach for enhancing the affinity and interaction between a resin and a filler by a chemical method such as modifying the filler. Alternatively, (2) the approach of preventing the chemical aggregation of fillers by adding an aggregation inhibitor is insufficient, and an effective process means field that is superior to the cohesive strength of fillers is created by external factors and processed. Is based on the idea that is necessary and best.

JP-A-8-12305 (paragraph numbers 0037-00003 etc.) International Publication No. 2002/005752 (Pages 24-25 etc.) Japanese Patent Laying-Open No. 2005-170813 (paragraph numbers 0038-0039, etc.) JP-A-10-130116 (paragraph number 0022, etc.) JP 2005-330378 A (Claim 1, paragraph number 0025, etc.) JP 2008-266577 A (Claim 1, paragraph number 0011, etc.)

  In the resin composite material obtained by curing the composite composition shown in Patent Literatures 1 to 4 and the resin composite material shown in Patent Literatures 5 and 6, since the filler is dispersed in the resin matrix, various mechanical properties are obtained. The characteristics can be easily improved. However, in these resin composite materials, in terms of abrasion resistance, the filler is likely to fall off, and since the filler is included, the resin composite material tends to become brittle, and as a result, the breaking energy tends to be low.

  However, when a resin composite material is produced using a thermosetting resin, an organic group used for reaction with the thermosetting resin is introduced to the surface of the inorganic particles used as a filler with a silane coupling agent or the like. Therefore, it is easy to form a chemical bond between the resin matrix and the surface of the inorganic particles and to build a strong organic-inorganic hybrid structure. For example, a method of introducing an epoxy group or an amino group to the surface of inorganic particles used in combination with an epoxy resin is generally well known.

  On the other hand, the thermoplastic resin molecule often does not have a reactive organic functional group, and even when it has a reactive organic functional group, it exists only at the terminal portion of the polymer chain. That is, the abundance ratio of the organic functional group capable of reacting in the thermoplastic resin molecule is overwhelmingly small. For this reason, when producing a resin composite material using a thermoplastic resin, it is difficult to form a sufficient amount of chemical bonds between the resin matrix and the inorganic particles to build a strong organic-inorganic hybrid structure. is there. With such a background, in the case of producing a composite material in which a filler is added to a thermoplastic resin, the filler surface treatment design is mainly aimed at improving the familiarity of the filler with the resin as described above. Yes.

  The present invention has been made in view of the above circumstances, while taking advantage of the high productivity of thermoplastic resins, compared to conventional resin composite materials, it is excellent in wear resistance and has rigidity, dimensional stability, It is an object to provide a resin composite material having high mechanical strength and high breaking energy, a dental material using the resin composite material, and a method for producing the resin composite material.

The above-mentioned subject is achieved by the following present invention. That is,
The resin composite material of the present invention has (A) the melting point or fluidization temperature in the range of 300 ° C. to 500 ° C. and 100 parts by mass of the thermoplastic resin having the main chain having an arylene group. It is produced using 40 to 400 parts by mass of inorganic particles surface-treated with the surface treatment agent represented by the formula (I), and the average embedding rate represented by the following formula (1) is 55% or more. It is characterized by being.
· General formula ^{(I) A-R 1 -SiR} 2 mBn
[In General Formula (I), A is an aromatic group, R ¹ is an organic group having 3 to 12 atoms constituting the straight chain portion, and R ² is a hydrocarbon group having 1 to 6 carbon atoms. And B is an alkoxy group having 1 to 6 carbon atoms, a halogen group, or an isocyanate group. Here, m and n are integers, the sum of m and n is 3, and m is an integer in the range of 0-2. ]
Formula (1) Average embedding rate (%) = 100 × {EP / (EP + V)}
[In the formula (1), EP is a polishing surface formed by subjecting a test piece made of a resin composite material to microtome polishing using a diamond knife, followed by platinum deposition treatment, and then the platinum deposition treatment. Is observed with a scanning electron microscope, the number of inorganic particles per 10 μm square area exposed in the polished surface subjected to the platinum vapor deposition treatment {number / (10 μm × 10 μm)}.
Further, V means the number of pores {10 / (10 μm × 10 μm)} per 10 μm square area formed by dropping inorganic particles in the 10 μm square area where the EP value is counted.
Moreover, an average embedding rate means the average value of the embedding rate each calculated | required in four measurement points. ]

  In one embodiment of the resin composite material of the present invention, it is preferable that the inorganic particles surface-treated with the (B) surface treatment agent have an average particle diameter of 0.05 μm or more and 15 μm or less.

  The dental material of the present invention is characterized by including the resin composite material of the present invention.

  The bone substitute material of the present invention includes the resin composite material of the present invention.

The method for producing a resin composite material of the present invention comprises (A) 100 parts by mass of a thermoplastic resin having a melting point or fluidization temperature in the range of 300 ° C. to 500 ° C. and a main chain having an arylene group, and (B) It includes at least a melt-kneading step of heating and melting and kneading a raw material containing 40 to 400 parts by mass of inorganic particles surface-treated with the surface treatment agent represented by the formula (III).
- formula ^{(III) A-R 1 -SiR} 2 mBn
[In General Formula (III), A is an aromatic group, R ¹ is an organic group having 3 to 12 atoms constituting the straight chain portion, and R ² is a hydrocarbon group having 1 to 6 carbon atoms. And B is an alkoxy group having 1 to 6 carbon atoms, a halogen group, or an isocyanate group. Here, m and n are integers, the sum of m and n is 3, and m is an integer in the range of 0-2. ]

  In one embodiment of the method for producing a resin composite material of the present invention, it is preferable that the inorganic particles surface-treated with (B) the surface treatment agent have an average particle diameter of 0.05 μm or more and 15 μm or less.

  According to the present invention, a resin composite material that is superior in wear resistance and has high rigidity, dimensional stability, mechanical strength, and breaking energy as compared with conventional resin composite materials while utilizing high productivity of thermoplastic resins. A dental material using the same and a method for producing the resin composite material can be provided.

The resin composite material of the present embodiment has (A) melting point or fluidization temperature in the range of 300 ° C. to 500 ° C. and 100 parts by mass of the thermoplastic resin having the main chain having an arylene group. It is produced using 40 to 400 parts by mass of inorganic particles surface-treated with the surface treatment agent represented by the general formula (I), and the average embedding rate represented by the following formula (1) is 55% or more. It is characterized by being.
· General formula ^{(I) A-R 1 -SiR} 2 mBn
Formula (1) Average embedding rate (%) = 100 × {EP / (EP + V)}

Here, in general formula (I), A is an aromatic group, R ¹ is an organic group having 3 to 12 atoms constituting the straight chain portion, and R ² is a hydrocarbon having 1 to 6 carbon atoms. And B is an alkoxy group having 1 to 6 carbon atoms, a halogen group, or an isocyanate group. Here, m and n are integers, the sum of m and n is 3, and m is an integer in the range of 0-2.

  Moreover, in Formula (1), after EP is a platinum vapor deposition treatment of the polishing surface formed by carrying out the microtome grinding | polishing of the test piece which consists of a resin composite material using a diamond knife, the said platinum vapor deposition treatment grinding | polishing When the surface is observed with a scanning electron microscope, it means the number {number / (10 μm × 10 μm)} of inorganic particles per 10 μm square area exposed in the polished surface subjected to the platinum deposition process. Further, V means the number of pores {10 / (10 μm × 10 μm)} per 10 μm square area formed by dropping inorganic particles in the 10 μm square area where the EP value is counted. Moreover, an average embedding rate means the average value of the embedding rate each calculated | required in four measurement points.

  The diamond knife to be used has a blade angle of 45 degrees and a blade width of 2 mm or more. An example of such a diamond knife is Diatom Diamond Knife Ultra 45 °. The cutting conditions were a clearance angle of 6 degrees, a cutting speed of 0.5 mm / sec, a test piece thickness to be cut (feed length) of 100 nm, a test piece area of 0.5 mm to 0.8 mm in width, and a length of 0.8 mm. ~ 1.2 mm. Cutting is performed wet, and distilled water is used as water. Under such conditions, the cut surface of the main body after being cut five times after at least the surface of the test piece starts to be cut uniformly is used for observation. The diamond knife should be new, re-polished or have a sharp edge with no blade spills.

  A sample cut with a diamond knife is fixed on a sample stage for a scanning electron microscope using a conductive adhesive such as carbon tape or carbon paste, and a platinum film having a thickness of 10 nm is formed under vacuum by a sputter coater. A film is formed by vapor deposition. The scanning electron microscope uses a field emission type (FE-SEM) with a resolution of 2 nm or more so that a clear image can be obtained. The measurement conditions are an acceleration voltage of 10 kV, a beam spot diameter of 3.0 nm, a sample tilt angle of 0 degree, a working distance of 5 mm, and a detector for backscattered electrons. Focus and astigmatism are adjusted so that the image is clearest, and the magnification is adjusted so that the total number of particles and holes per SEM photograph (one observation area) is 100-300. Then measure. Since the reflected electron image of the inorganic particles is observed brighter than that of the resin, the inorganic particles can be easily counted by appropriately adjusting the brightness and contrast. When counting the number of inorganic particles and the number of pores, care is taken not to count bubbles originally contained in the sample. The holes can be easily distinguished from each other because they are oriented in the cutting direction by the diamond knife. In addition, a plurality of holes may be combined to form a large hole. In such a case, the number of holes is counted in comparison with the size and shape of the inorganic particles.

  The average embedding rate is more preferably 60% or more, and further preferably 65% or more.

  Here, the resin composite material of this embodiment includes (A) 100 parts by mass of a thermoplastic resin and (B) 40 to 400 parts by mass of inorganic particles surface-treated with the surface treatment agent represented by the general formula (I). It is manufactured through at least a melt-kneading step of heating and melting and kneading the raw material to be contained.

  For this reason, the resin composite material of the present embodiment is superior in wear resistance, rigidity, and dimensional stability as compared with a resin composite material using a conventional thermoplastic resin, while utilizing the high productivity of the thermoplastic resin. High mechanical strength and breaking energy. Here, when the inorganic particles are simply blended with the thermoplastic resin, it becomes easy to obtain the various effects listed above, but the resin composite material itself becomes brittle and the breaking energy decreases. However, in the resin composite material of this embodiment, the breaking energy can be improved at the same time. Although the details of the reason why such an effect is obtained are unknown, the present inventor estimates as follows. That is, when inorganic particles are dispersed in the resin matrix, when the surface of the resin composite material is polished, cut, or slid, the inorganic particles are removed from the surface relatively easily. This is because the inorganic particles and the resin cannot form a strong chemical bond such as a covalent bond, and the bonding force acting between the inorganic particles and the resin matrix is based on the anchoring effect of the inorganic particles. Only weak intermolecular forces. In addition, as described above, a thermosetting resin can form a strong chemical bond (covalent bond) between a resin matrix and inorganic particles by using a reactive group of a polymerizable monomer. However, with a thermoplastic resin, it is difficult to form a strong covalent bond as described above between the thermoplastic resin and the inorganic particles.

  For this reason, the bonding force acting between the inorganic particles and the resin matrix made of the thermoplastic resin is only an intermolecular force. And this point is the same also in the resin composite material illustrated by patent document 6 which disperse | distributes an inorganic particle to a resin matrix only by a high shear force. That is, in the resin composite materials using these conventional thermoplastic resins, it is considered that the bonding force at the interface between the resin matrix and the inorganic particles is extremely weak.

  Therefore, when the surface of these resin composite materials is polished or the like, if a force is applied to the inorganic particles, the inorganic particles easily fall off from the resin matrix. In addition to this, when stress is applied to the resin composite material, stress concentration occurs at the interface between the resin matrix having the weakest bonding force and the inorganic particles, and breakage easily occurs at the interface.

  On the other hand, in the resin composite material of the present embodiment, inorganic particles surface-treated with the surface treatment agent represented by the general formula (I) are used in the production. In the following description, when the surface treated with the surface treatment agent represented by the general formula (I) is referred to, it is referred to as “surface-treated inorganic particles”, and when referring to the inorganic particle main body itself, it is simply “inorganic. Referred to as “particles”.

Here, since the number of atoms constituting the linear portion of the organic group R ¹ of the surface treatment agent represented by the general formula (I) is 3 or more, the molecular chain length of the surface treatment agent is a thermoplastic resin molecule (high It is long enough to form an entanglement with the molecular chain. Therefore, individual polymer chains constituting the resin matrix are easily entangled with the surface treatment agent molecules constituting the surface layer. In addition, the entanglement between the surface treatment agent molecules and the polymer chains is promoted by the shearing force applied during melt-kneading.

Furthermore, the aromatic group A of the surface treatment agent represented by the general formula (I) is a group that is bulky and can form a stacking structure by π-π interaction between surface treatment agent molecules arranged on the surface. is there. Further, as described above, since the number of atoms constituting the linear portion of the organic group R ¹ is 3 or more, the molecular chain length of the surface treatment agent penetrates between the polymer chains and forms entanglements with them. It is long enough to do. Furthermore, since the bulk of the aromatic group A becomes larger than the bulk of the organic group R ¹ , if the aromatic group A penetrates between the polymer chains by the shearing force applied during melt kneading, It is presumed that the three-dimensional anchor effect is easily exhibited. On the other hand, when the chain length of the organic group R ¹ is too long, it becomes difficult to hold the elongated polymer chain so as to be sandwiched between the bulky aromatic group A and the surface of the inorganic particles. The dynamic anchor effect is expected to be significantly reduced. However, it is considered that the reduction of the steric anchor effect as described above can be suppressed by setting the number of atoms constituting the linear portion of the organic group R ¹ to 12 or less.

  In addition to this, it is presumed that the aromatic group A composed of aromatic groups can further strengthen the interaction with the individual polymer chains constituting the resin matrix by the π-π interaction. That is, when the thermoplastic polymer constituting the resin matrix contains π electrons due to an aromatic ring in the molecule, in addition to the bonding force based on the normal intermolecular force, the π electrons on the polymer side, The bonding force based on the interaction of the aromatic group constituting the aromatic group A with the π electron also acts.

  Therefore, in the resin composite material of the present embodiment, when the surface of the resin composite material is polished or the like, the surface-treated inorganic particles are easily removed from the resin matrix even if force is applied to the surface-treated inorganic particles. Can be suppressed. In addition to this, when stress is applied to the resin composite material, even if the stress is concentrated on the interface between the resin matrix and the surface-treated inorganic particles, destruction at the interface is suppressed.

  Next, the detail of each component which comprises the resin composite material of this embodiment is demonstrated below.

(A) Thermoplastic resin As a thermoplastic resin, a well-known thermoplastic resin can be utilized. Here, the melting point when the thermoplastic resin used is a crystalline resin and the fluidization temperature when it is an amorphous resin are in the range of 300 ° C to 500 ° C. Here, the upper limit of the melting point or flow temperature is 500 ° C. or less from the viewpoint practical, such as material selection, availability, it is good Mashiku is 430 ° C. or less, it is 400 ° C. or less More preferred. Also, the heating temperature for melt-mixing a thermoplastic resin and inorganic particles (melting temperature), in order to improve the heat resistance of the tree fat composite material is preferably the melting temperature and 200 ° C. or higher. Melting or fluidization temperatures of the order thermoplastic resin in view of the above Symbol heat resistance, is 3 00 ° C. or higher. In addition, since the thermoplastic resin has high heat resistance and durability, the glass transition temperature is preferably 100 ° C. or higher, and more preferably 200 ° C. or higher. On the other hand, when the melting point, fluidization temperature, and glass transition temperature are lower, the abrasion resistance, rigidity, dimensional stability, and mechanical strength of the thermoplastic resin itself are further lowered. However, in such a case, when surface-treated inorganic particles are added, it is easy to obtain a more remarkable improvement effect with respect to these mechanical properties than when these physical property values are higher. Furthermore, the thermoplastic resin has a melt viscosity measured by a capillary viscometer in the range of the melting point or fluidization temperature to 500 ° C., that is, the shear viscosity at a shear rate of 1000 (1 / s) is 10 Pa · What has the area | region which shows the range of s-10000Pa * s is preferable, and what has the area | region which shows the range of 250Pa * s-1000Pa * s is more preferable. Such a melt viscosity is excellent in kneading of a thermoplastic resin and inorganic particles and molding of the resulting resin composite material, and the melting temperature is preferably selected from this range.

  Also, when the aromatic group A contains a polymerizable carbon-carbon double bond such as monovalent styrene, the melting temperature is preferably 200 ° C. or higher. This is because a temperature of at least 200 ° C. is required in order to polymerize the polymerizable carbon-carbon double bonds when melt kneading using the thermoplastic resin and the surface-treated inorganic particles. . In this case, the surface layer made of the surface treatment agent formed on the surface of the inorganic particles has a network structure because the polymerizable carbon-carbon double bonds react with each other during melt kneading. Therefore, an entangled structure between the network structure and the thermoplastic resin molecules is formed during melt kneading. Therefore, the surface-treated inorganic particles can be further suppressed from easily falling off from the resin matrix. In addition, when stress is applied to the resin composite material, even if the stress is concentrated on the interface between the resin matrix and the surface-treated inorganic particles, the breakage at the interface can be further suppressed.

The thermoplastic resin has preferably a thermoplastic resin linear. Further , since the heat resistance and mechanical strength are high, a thermoplastic resin having a structure in which the main chain has an arylene group is used . Further, since it is considered that the aromatic group A penetrates between the polymer chains and exhibits a steric anchor effect due to the shearing force applied during melt-kneading, the arylene group preferably has no substituent.

Further, the molecular structure of the thermoplastic resin is preferably a linear structure with little steric hindrance, preferably has a low molecular weight, and preferably has high fluidity. All of these characteristics are considered that the aromatic group A constituting the surface treatment agent molecule that covers the surface of the inorganic particles during melt-kneading easily penetrates between the thermoplastic resin molecules and exhibits a three-dimensional anchor effect. When specific examples of the thermoplastic resin, Po Riarireto (PA R), a port Risarufon (PSF), aromatic polyether ketone resins such as polyether ether ketone (PEEK), Kaoru aromatic polyimide (P I) Can be used.

  Among these resins, the benzene ring has a bonding group (ether group and ketone group) because it has particularly high mechanical strength (compression stress, tensile stress, fatigue, wear, etc.), chemical resistance, water resistance, and color resistance. It is preferable to use an aromatic polyether ketone resin having a structure bonded in a straight chain via Here, as the aromatic polyetherketone resin, a basic straight chain in which ether groups and ketone groups are alternately arranged as a linking group that bonds to a benzene ring and a benzene ring adjacent to each other constituting the linear main chain. Polyetherketone (PEEK) having a chain structure, polyetheretherketone (polyetherketone, PEEK) in which bonding groups are arranged in the order of ether group, ether group, and ketone group, and bonding group in the order of ether group, ketone group, and ketone group Polyetherketoneketone (Polyetherketoneketone, PEKK), Polyetheretherketoneketone (Polyetherketoneketone) with a bonding group in the order of ether group, ether group, ketone group, and ketone group , PEEKK), polyether ketone ether ketone ketone (PEKEKK), and the like. Of these polyetherketone resins, polyetheretherketone is preferably used. These resins are all linear and have no substituent on the benzene ring, and the polymer chain does not have a large bulky structure. For this reason, it is considered that the aromatic group A constituting the surface treatment agent molecule that covers the surface of the inorganic particles during melt kneading easily penetrates between the thermoplastic resin molecules and exhibits a three-dimensional anchor effect. Further, as the resin, two or more kinds of resins can be appropriately mixed and used.

  The molecular weight of the thermoplastic resin can be selected as appropriate, but is preferably selected in consideration of the points described below. Usually, the mechanical properties tend to improve as the molecular weight of the thermoplastic resin increases, but the fluidity of the plasticized thermoplastic resin tends to decrease, making it difficult to blend many inorganic particles. There is a case. In addition, as the fluidity of the plasticized thermoplastic resin is lower, the melt-kneading process performed when the resin composite material of the present embodiment is manufactured, the extrusion process or the injection molding process performed as necessary, etc. Since the load on the manufacturing apparatus in various processes increases, stable manufacturing may be difficult. However, the lower the fluidity of the thermoplastic resin, the higher the efficiency of kneading the thermoplastic resin and inorganic particles, and the higher the average embedding rate. Therefore, it is preferable to select the molecular weight of the thermoplastic resin in consideration of these balances.

(B) Surface-treated inorganic particles The inorganic particles constituting the surface-treated inorganic particles are not particularly limited as long as they are known inorganic particles. Here, the material of the inorganic particles specifically includes, for example, amorphous silica, borosilicate glass, soda glass, aluminosilicate glass, and fluoroaluminosilicate glass, glass containing heavy metals (for example, barium, strontium, zirconium). ; Glass ceramics such as crystallized glass in which crystals are precipitated on these glasses, crystallized glass in which crystals such as diopside and leucite are precipitated; composite inorganic such as silica-zirconia, silica-titania, silica-alumina, etc. An oxide; or an oxide obtained by adding a group I metal oxide to a composite oxide thereof; a metal inorganic oxide such as silica, alumina, titania, zirconia; and the like can be used. The glass transition point, transformation temperature and melting point of the inorganic particles are preferably higher by 100 ° C. or more than the molding temperature of the thermoplastic resin.

Among the inorganic particle materials listed above, functional groups can be easily introduced by surface treatment using a silane coupling reaction, and a strong covalent bond can be formed between the surface treatment agent and the inorganic particles. Silica or a metal composite oxide mainly composed of silica is particularly preferable. Here, the main component means that 50% by mass or more of the silica component is contained, and it is preferable that 80% by mass or more of silica is contained in the metal composite oxide. In order to strengthen the interaction at the thermoplastic resin / inorganic particle interface, the interfacial area, that is, the specific surface area of the inorganic particles is preferably 2.0 m ² / g or more and less than 20 m ² / g. more preferably 0m ² /g~10.0m ² / g. Also, there is no particular limitation on the particle shape, and shapes such as a true sphere shape, a substantially spherical shape, a bead shape, a dimple shape, a confetti shape, a cloud shape, a cocoon shape, and a fiber shape can be used. Amorphous inorganic particles are preferably used.

  It is preferable that the presence of active groups (for example, metal hydroxide groups such as silanol groups) capable of reacting with the surface treatment agent on the surface of the inorganic particles is higher. This is considered to be because a stronger cross-linked structure can be constructed when the distance between the functional groups introduced by the surface treatment is close. In order to produce such inorganic particles, those produced by firing at a relatively low temperature of 750 to 950 ° C. so that silanol groups on the surface remain as much as possible are preferable. For example, as a method for producing such inorganic particles, it can be preferably obtained by using a sol-gel method exemplified in JP-A Nos. 58-110414 and 58-156524. . Further, it is more preferable to use inorganic particles whose surface is covered with silica so that many silanol groups exist as reactive active groups because of the high reaction activity of the surface treatment agent. In this case, it is easy to use silica as a raw material, but it is possible to introduce a silanol group by subjecting the surface of other inorganic particles to silica coating treatment. At this time, the thickness of the silica coat layer is preferably 3 nm or more as measured by transmission microscope observation. As such a silica coating method, for example, a method disclosed in JP-A-2008-7381 can be used.

  In addition, when using the resin composite material of the present embodiment as a dental material, it is easy to impart transparency close to the tooth, and it is less harmful to the living body. Silica, zirconia and titanium dioxide are preferred. When zirconia is selected as the inorganic particles, the elastic modulus and hardness of the resin composite material of this embodiment can be made higher than when other inorganic particles are selected, and the properties of the molded body are closer to those of metal materials. This is preferable. Further, the shape of the inorganic particles is not particularly limited, and may be appropriately selected from spherical, substantially spherical, indefinite shape, needle shape, aggregated shape, cluster shape, and the like. It is preferable to use a powder agglomerated by.

  Further, the surface of the inorganic particles is surface-treated with a surface treatment agent represented by the general formula (I). As the aromatic group A constituting the surface treating agent, a monocyclic hydrocarbon group having one aromatic ring such as a phenyl group, a phenoxy group, a phenylamino group, a benzophenone group, and a hydroxybenzophenone group, an aromatic group such as a biphenyl group Examples thereof include a non-condensed polycyclic hydrocarbon group having 2 rings and a condensed polycyclic hydrocarbon group having 2 aromatic rings such as a naphthyl group. The non-condensed polycyclic hydrocarbon group means a group in which a carbon atom constituting one aromatic ring and a carbon atom constituting the other aromatic ring form a direct bond. Further, these aromatic groups may have a substituent having a polymerizable carbon-carbon double bond. Such substituents include unsaturated aliphatic groups including vinyl groups, (meth) acrylic groups, (meth) acrylamide groups, and the like.

R ¹ is an organic group having 3 to 12 atoms constituting the straight chain portion, and is not a branched type having a side chain portion because it easily forms an entangled structure with a thermoplastic resin molecule, but is a straight chain type. It is particularly preferred. For the same reason, the number of atoms constituting the straight chain portion is preferably 3 to 6, and most preferably 4 to 6. If the chain length of R ¹ is too short, it will be difficult to entangle with the thermoplastic resin molecules, and it will be difficult to obtain a three-dimensional anchor effect, and if the chain length is too long, it will be difficult to obtain a sufficient reinforcing effect. Incidentally, the atoms constituting the straight chain moiety of the organic group R ¹ is typically consists of only carbon atoms and may contain heteroatoms such as oxygen atom forming an ether bond. Here, as an example of the organic group ^{R 1} in the case the number of atoms constituting the straight chain moiety is 3, for _{example, -CH 2 -CH 2 -CH 2 -} , - CH 2 -CH 2 -O-, etc. Can be mentioned. R ¹ typically includes a linear alkylene group (including a case where at least one carbon atom constituting the main chain is substituted with a hetero atom such as an oxygen atom).

  m can take an integer of 0, 1, or 2, but when m is small (ie, when n is large), the three-dimensional structure of the surface is complicated by the condensation reaction between silanol groups, and the three-dimensional anchor effect is exhibited. Therefore, it is preferable that m = 1 (n = 2).

  Examples of such surface treatment agents include phenoxypropyltrichlorosilane, phenoxypropylmethyldichlorosilane, phenoxypropyldimethylchlorosilane, benzoylpropyltrimethoxysilane, phenylaminopropyltrimethoxysilane, 3-phenylpropylmethyldicololosilane, 4 -Phenylbutyltrichlorosilane, 4-phenylbutylmethyldichlorosilane, 11-phenoxyundecyltrichlorosilane, 2-hydroxy-4- (3-triethoxysilylpropoxy) diphenyl ketone, 6-phenylhexyldimethylchlorosilane, N-1- Phenylethyl-N′-triethoxysilylpropylurea, 3- (4-methacryloyloxyphenyl) propyltrimethoxysilane, 3- (4-methacryloyloxypheny ) Propyltrichlorosilane, 3- (4-methacryloyloxyphenyl) propyltriisocyanatosilane, styrylpropyltrimethoxysilane, 3- (N-styrylmethyl-2-aminoethylamino) -propyltrimethoxysilane, (methacryloyl) Roxymethyl) phenylbutyltrimethoxysilane and the like.

  In order for the surface treatment agent to form a regular structure on the surface of the inorganic particles, the surface treatment agent is preferably coated with a single layer. Although it is difficult to completely coat the surface of the inorganic particles on the surface of the inorganic particles, it is possible to predict the approximate optimum amount from the relationship between the minimum surface area of the surface treatment agent and the specific surface area of the inorganic particles. is there. That is, the optimum surface treatment agent amount (theoretical amount) can be calculated by dividing the product of the weight of the inorganic particles and the specific surface area of the inorganic particles by the minimum surface area of the surface treatment agent. And it is preferable that it exists in the range of 0.7-1.2 with respect to this theoretical amount.

  A surface treating agent may be used independently and can also be used in mixture of 2 or more types. Moreover, when surface-treating the surface of an inorganic particle with a surface treating agent, it is preferable to use a surface treating agent in the ratio of 1 mass part-10 mass parts with respect to 100 mass parts of inorganic particles. As the surface treatment method, a known method can be used without particular limitation. For example, a method of spraying the surface treatment agent while stirring the inorganic particles vigorously with a stirring blade, a method of dispersing the inorganic particles in an appropriate solvent, dissolving the surface treatment agent, and removing the solvent, or in an aqueous solution In this method, the alkoxy group of the surface treatment agent is hydrolyzed with an acid catalyst to be converted into a silanol group, adhered to the surface of the inorganic particles in the aqueous solution, and then water is removed by a method such as spray drying, an appropriate dispersion medium. Examples thereof include a method in which inorganic particles are dispersed therein, a surface treatment agent is dissolved, and after refluxing, the inorganic particles are separated by filtration and classified and recovered. In any method, the reaction between the surface of the inorganic particles and the surface treatment agent is promoted by heating preferably in the range of preferably 50 to 200 ° C, more preferably in the range of 100 to 150 ° C. A highly functional surface treatment can be performed.

  The average particle diameter of the surface-treated inorganic particles (or inorganic particles) is not particularly limited, but is preferably in the range of 0.05 μm to 15 μm, and more preferably in the range of 0.2 μm to 5 μm. Preferably, it is in the range of 0.3 μm or more and 0.6 μm or less. When the average particle diameter is 0.05 μm or more, the surface-treated inorganic particles are prevented from agglomerating and the surface-treated inorganic particles can be easily dispersed and contained in the resin matrix. Moreover, the uniformity of a material can be maintained as the whole resin composite material by making an average particle diameter into 15 micrometers or less. When two or more kinds of surface-treated inorganic particles are used, the average particle diameter of each surface inorganic particle may be the same or different, but any average particle diameter is 0.05 μm or more and 15 μm. It is preferable to be within the following range. In addition, the average particle diameter here refers to D50 value in the volume fraction by particle size distribution meter measurement.

  Moreover, the compounding quantity of the surface treatment inorganic particle with respect to 100 mass parts of resin exists in the range of 40 mass parts-400 mass parts, and it is preferable in the range of 60 mass parts-300 mass parts, and 80 mass parts-150. More preferably within the range of parts by mass. By setting the blending amount to 40 parts by mass or more, the mechanical strength can be improved and excellent dimensional stability can be obtained as in the case of the conventional resin composite material, and as the blending amount of the surface-treated inorganic particles increases. Thus, the efficiency of kneading can be improved and the interfacial reaction can be promoted to increase the average embedding rate. Moreover, it becomes easy to prevent aggregation of surface treatment inorganic particles or to suppress a dispersion | distribution defect by making a compounding quantity into 400 mass parts or less.

(C) Other components In addition, other components can be appropriately added to the resin composite material depending on the purpose of use of the resin composite material. For example, an antistatic agent, an ultraviolet absorber, a pigment, a colorant, etc. Can be added.

(Production method of resin composite material)
As described above, the resin composite material of this embodiment is manufactured through at least a melt-kneading step of heating and melting and kneading a raw material containing a thermoplastic resin and surface-treated inorganic particles. The heating temperature in melt-kneading step (melting temperature), higher than the melting point or flow temperature of the thermoplastic resin to be used may be appropriately selected in a temperature range below the thermal decomposition temperature, but the heat resistance of the tree fat composites From the viewpoint of improvement, the temperature is preferably 200 ° C. or higher. The apparatus used in the melt-kneading step is not particularly limited as long as it is a known melt-kneader, and for example, a mixer with a heating device, a single-axis melt-kneader, a biaxial melt-kneader or the like can be used. As a device used in the melt-kneading step, a twin screw extruder is preferably used. The specifications of the twin screw extruder, screw shape and operating conditions may be arbitrarily selected according to the purpose, but the average embedding of the surface-treated inorganic particles increases as the screw rotation speed increases and the pressure applied to the kneaded product increases. The rate can be increased. This is thought to be because the interfacial reaction between the thermoplastic resin and the surface-treated inorganic particles proceeds, and the entanglement of the molecular chains proceeds more effectively between the thermoplastic resin molecules and the surface layer of the surface-treated inorganic particles. .

  Further, after the melt-kneading process, various post-processes may be performed as necessary. For example, a high-temperature melt-kneaded product immediately after the melt-kneading step can be directly molded into a predetermined shape by injection molding or extrusion molding. Moreover, after the melt-kneaded material in a high-temperature state immediately after the melt-kneading step is once formed into a secondary processing member such as a pellet, powder, or block, the secondary processing member is further used. Various processes such as injection molding, extrusion molding, laser forming, cutting, cutting, and polishing may be performed.

  In the production of the resin composite material of the present embodiment, after undergoing a melt-kneading step, a molded body having a predetermined shape is usually obtained by various molding methods such as injection molding, extrusion molding, and compression molding. At this time, the productivity of the molded body can be increased by rapidly cooling the mold. In such a case, residual stress may be generated inside the compact due to rapid cooling. In addition, when a crystalline resin is used as the thermoplastic resin, the crystalline structure of the crystalline resin may not be ideally formed. In order to solve these problems, in the method for producing a resin composite material of the present embodiment, heat treatment may be performed on a molded body obtained as necessary. By performing the heat treatment, the residual stress inside the molded body can be released. Further, when a crystalline resin is used as the thermoplastic resin, recrystallization of the resin that has been vitrified by rapid cooling can be promoted by heat treatment, and as a result, the mechanical strength of the molded body can be increased.

  The heat treatment method (heat treatment step) is not particularly limited, but the temperature is preferably selected from a temperature range that is not lower than the glass transition point and does not exceed the melt viscosity, and is preferably selected from the range of 150 to 300 ° C. The heat treatment time is preferably selected from 30 minutes to 6 hours. In the cooling step after the heat treatment, it is preferable that the heat source is turned off in a heating apparatus such as an oven that has been subjected to the heat treatment, and the temperature is returned to room temperature over 1 hour or more. For the same reason, in the method for producing a resin composite material of the present embodiment, when a molded body having a predetermined shape is obtained by a molding method such as injection molding, extrusion molding, or compression molding, after molding into a predetermined shape. By carrying out the cooling step described above, a final molded product having high strength can be obtained without going through a heat treatment step.

(Use of resin composite materials)
The application of the resin composite material of the present embodiment is not particularly limited and can be used for various applications. For example, it is preferably used as a dental material. Since the resin composite material of this embodiment contains a large amount of inorganic particles and has excellent mechanical strength, it is excellent when used as a dental material that is routinely exposed to a large pressing force during mastication in the oral cavity. Can exhibit mechanical durability.

  In addition to this, even if the surface is exposed to sliding or friction due to contact with a toothbrush or a tooth disposed opposite to a tooth using the resin composite material of the present embodiment, the inorganic particles are not easily dropped, The surface is hard to wear. Therefore, at the treatment site using the resin composite material of the present embodiment, the glossiness and lubricity at the time of treatment can be maintained for a long time. Therefore, the aesthetics are hardly deteriorated over a long period of time, the roughness of the touch can be suppressed, and the surface unevenness due to the falling off of the inorganic particles is small, so that the adhesion of the plaque and the coloring caused thereby can be suppressed.

  The resin composite material of the present embodiment can also be used as a bone substitute material that often requires mechanical strength.

  Hereinafter, the present invention will be described more specifically with reference to examples and the like, but the present invention is not limited to these examples and the like.

  The thermoplastic resins used and their abbreviations, used inorganic particles and their abbreviations, used surface treatment agents and their abbreviations, sample preparation methods and evaluation methods are shown below.

(Thermoplastic resin)
P1: Polybutylene terephthalate (DURANEX 2000, Polyplastics, melting point 228 ° C, melt viscosity 150 ° C at 250 ° C)
P2: Polyamide (Novamid 1010C2, Mitsubishi Engineering Plastics, melting point 215 ° C., melt viscosity 150 ° C. at 240 ° C.)
P3: polyetheretherketone resin (PEEK1000G, Daicel Evonik Co., Ltd., melting point 334 ° C., melt viscosity 200 ° C. at 370 ° C.)
P4: Polyetheretherketone resin (PEEK381G, Victrex, melting point 334 ° C., melt viscosity 400 Pa · s at 370 ° C.)
P5: polyetheretherketone resin (PEEK90G, Victrex, melting point 334 ° C., melt viscosity 100 Pa · s at 370 ° C.)

(Inorganic particles)
F1: Average particle diameter of 0.40 microns, spherical sol-gel silica (Tokuyama Corporation), specific surface area: 7.0 m ² / g
F2: Average particle diameter of 2.5 microns, crushed silica zirconia (Tokuyama Co., Ltd.), specific surface area: 2.9 m ² / g
F3: average particle size 2.8 microns, spherical silica (Tokuyama Corporation), specific surface area: 12 m ² / g
F4: average particle size 0.15 microns, spherical silica zirconia (Tokuyama Co., Ltd.), specific surface area: 22 m ² / g
F6: average particle size of 8.6 microns, zirconia (Daiichi Rare Element Chemical Co., Ltd.), aggregate with a primary particle size of 1.0 microns, specific surface area of 3.3 m ² / g
F7: Average particle diameter of 4.0 microns, silica (Tokuyama Co., Ltd.), specific surface area of 1.3 m ² / g

(Surface treatment agent)
S1: Benzoylpropyltrimethoxysilane (BPTMS)
S2: Phenoxypropyltrichlorosilane (PPTCS)
S3: 6-phenylhexyldimethylchlorosilane (PHMCS)
S4: 2-hydroxy-4- (3-triethoxysilylpropoxy) diphenyl ketone (HDPKPTES)
S5: 3-styrylpropyltrimethoxysilane (SPTMS)
S6: 3- (N-styrylmethyl-2-aminoethylamino) -propyltrimethoxysilane (SMAPTMS)
S11: Hexamethyldisilazane (HMDS)
S12: Octadecyltrimethoxysilane (ODTMS)
S13: Phenyltrimethoxysilane (PTMS)
S14: Vinyltrimethoxysilane (VTMS)
S15: 1-phenyl-1-trichlorosilylbutane (PTCSB)

(Measurement method of bending strength and elastic modulus)
Using a rotary diamond cutter, a compression molded body having a thickness of 2 mm was cut at an interval of 2 mm under water injection, and five sample rods each having a length of 25 mm, a width of 2 mm, and a thickness of 2 mm were obtained. For these samples, remove the burrs using # 800 water-resistant abrasive paper, measure the width and thickness of the center of the test piece with a micrometer, and use the universal testing machine AG-50kI (Shimadzu Corporation) in the room temperature atmosphere. A three-point bending test was performed under the conditions of a distance between fulcrums of 20 mm and a crosshead speed of 1 min / mm to obtain a stress (bending strength) -strain curve. Under the present circumstances, bending strength was calculated | required based on the following Formula (2).

Formula (2) σ _B = 3PS / 2WB ²

Here, in formula (2), σ _B : bending strength (Pa), P: load at the time of breaking the test piece (N), S: distance between supporting points (m), W: width of the test piece (m), B: The thickness (m) of the test piece.
Moreover, the bending elastic modulus was calculated | required based on the following Formula (3). For the calculation, a load range from 5N to 10N was used.
Formula (3) E _B = (S ³ / 4WB ³ ) × (F / Y)
Here, E _B : flexural modulus (Pa), F / Y: slope of load-deflection curve (N / m). S, W, and B are the same as those shown in Expression (2).

(Measurement method of Vickers hardness)
The Vickers hardness of the surface of the compression molded body was measured using a micro hardness meter (manufactured by Matsuzawa Seiki Co., Ltd.) under the conditions of a load of 100 gf and a load time of 30 seconds. Four-point measurement was performed and the average value was obtained.

(Calculation method of average embedding rate)
The tip of the resin composite material cut into a 2.0 × 2.0 × 10 mm test piece using a diamond cutter is 0.5 mm to 0.8 mm wide and 0.8 mm to 1.2 mm long. Adjustment was made with a laser blade. Then, using a ultramicrotome (manufactured by RMC) and a diamond knife ultra 45 ° (manufactured by Diatome), the tip portion was stored with distilled water, a clearance angle of 6 degrees, a cutting speed of 0.5 mm / sec, and a cutting specimen thickness. Cutting was performed at 100 nm. Then, at least the polished surface of the test piece after cutting five times after the surface of the test piece started to be cut uniformly was used for observation. A platinum film having a thickness of 10 nm was formed on the polished surface of the test piece thus cut by vapor deposition. Subsequently, the polished surface subjected to the platinum deposition treatment was observed with a field emission scanning electron microscope (FE-SEM, resolution at 10 kV is 1.5 nm). The observation conditions were an acceleration voltage of 10 kV, a beam spot diameter of 3.0 nm, a sample tilt angle of 0 degree, a working distance of 5 mm, and a detector for backscattered electrons. Four images with adjusted focus, astigmatism, contrast, and brightness were taken so that the inorganic particles and pores could be clearly identified, and the average embedding rate was determined from the following equation (1).
Formula (1) Average embedding rate (%) = 100 × {EP / (EP + V)}

  Here, in the formula (1), EP is the number of inorganic particles per 10 μm square area exposed in the polished surface {number / (10 μm × 10 μm)}, and V is 10 μm square counting the EP value. In the region, the number of holes per 10 μm square region formed by dropping inorganic particles {number / (10 μm × 10 μm)} is meant.

< Comparative Example 11 >
Into a three-necked flask equipped with a reflux condenser, 100 g of inorganic particles F1 and 200 ml of toluene are weighed and mixed, and then a slurry in which primary particles are dispersed with a homogenizer is added, and 2.5 g of surface treatment agent S1 is added and stirred. The mixture was heated under reflux for 2 hours. The solid content was separated by a centrifugal separator, washed twice with toluene, and then dried at 90 ° C. for 10 hours in a vacuum dryer. Thereby, surface-treated inorganic particles were obtained.

  Next, 100 parts by mass of (A) thermoplastic resin P1 and 80 parts by mass of (B) surface-treated inorganic particles were weighed and put into a kneader Labo Plast Mill (manufactured by Toyo Seiki Co., Ltd.). A sample was collected after kneading for 5 minutes at a test temperature (melting temperature) of 250 ° C. and a rotation speed of 100 rpm, and this was compression molded into a plate shape (length 50 mm × width 50 × thickness 2 mm) using a thermal compression molding machine. The resin composite material was obtained by slow cooling. Table 1 shows the raw material composition and evaluation results of the resin composite material.

< Comparative Example 12 to Comparative Example 15 >
The surface-treated inorganic particles used for the production of the resin composite material were produced in the same manner as in Comparative Example 11 except that the conditions were changed to those shown in Table 1. Subsequently, a resin composite material was obtained in the same manner as in Comparative Example 11 except that the amount of inorganic particles was changed to the conditions shown in Table 1. Table 1 shows the raw material composition and evaluation results of the resin composite material.

< Comparative Example 16 to Comparative Example 20 >
The surface-treated inorganic particles used for the production of the resin composite material were produced in the same manner as in Comparative Example 11 except that the conditions were changed to those shown in Table 1. Subsequently, with a thermoplastic resin P2 instead of the thermoplastic resin P1, the amount of the inorganic particles under conditions shown in Table 1, except that the test temperature (melting temperature) and 240 ° C. similar to Comparative Example 11 In this way, a resin composite material was obtained. Table 1 shows the raw material composition and evaluation results of the resin composite material.

<Examples 11 to 25>
The surface-treated inorganic particles used for the production of the resin composite material were produced in the same manner as in Comparative Example 11 except that the conditions were changed to those shown in Table 1. Subsequently, with a thermoplastic resin P3 instead of the thermoplastic resin P1, the amount of the inorganic particles under conditions shown in Table 1, except that the test temperature (melting temperature) and 370 ° C. similar to Comparative Example 11 In this way, a resin composite material was obtained. Table 1 shows the raw material composition and evaluation results of the resin composite material.

<Example 26>
The surface-treated inorganic particles used for the production of the resin composite material were produced in the same manner as in Comparative Example 11 except that the conditions were changed to those shown in Table 1.

  Next, (A) 100 parts by mass of the thermoplastic resin P3 and (B) 150 parts by mass of the surface-treated inorganic particles were weighed and put into a small biaxial extrusion molding machine (manufactured by Parker Corporation). Samples were collected after kneading at a test temperature (melting temperature) of 370 ° C. and a rotation speed of 500 rpm, and this was compression-molded into a plate shape (length 50 mm × width 50 × thickness 2 mm) using a thermal compression molding machine. The resin composite material was obtained by slow cooling. Table 1 shows the raw material composition and evaluation results of the resin composite material.

<Examples 27 to 36>
The surface-treated inorganic particles used for the production of the resin composite material were produced in the same manner as in Comparative Example 11 except that the conditions were changed to those shown in Table 1. Subsequently, a resin composite material was obtained in the same manner as in Comparative Example 11 except that the blending amounts of the thermoplastic resin and inorganic particles used were the conditions shown in Table 1 and the test temperature (melting temperature) was 370 ° C. . Table 1 shows the raw material composition and evaluation results of the resin composite material.

<Comparative Example 1>
The surface-treated inorganic particles used for the production of the resin composite material were produced in the same manner as in Comparative Example 11 except that the conditions were changed to those shown in Table 2.

  Next, 100 parts by mass of (A) thermoplastic resin P1 and 80 parts by mass of (B) surface-treated inorganic particles were weighed and put into a kneader Labo Plast Mill (manufactured by Toyo Seiki Co., Ltd.). A sample was collected after kneading for 5 minutes at a test temperature (melting temperature) of 250 ° C. and a rotation speed of 100 rpm, and this was compression molded into a plate shape (length 50 mm × width 50 × thickness 2 mm) using a thermal compression molding machine. The resin composite material was obtained by slow cooling. Table 2 shows the raw material composition and evaluation results of the resin composite material.

<Comparative example 2>
The surface-treated inorganic particles used for the production of the resin composite material were produced in the same manner as in Comparative Example 1 except that the conditions were changed to those shown in Table 2. Subsequently, a resin composite material was obtained in the same manner as in Comparative Example 1 except that the amount of inorganic particles was changed to the conditions shown in Table 2. Table 2 shows the raw material composition and evaluation results of the resin composite material.

<Comparative Example 3>
The surface-treated inorganic particles used for the production of the resin composite material were produced in the same manner as in Comparative Example 1 except that the conditions were changed to those shown in Table 2. Subsequently, the thermoplastic resin P2 was used in place of the thermoplastic resin P1, the inorganic particles were mixed in the conditions shown in Table 1, and the test temperature (melting temperature) was 240 ° C. In this way, a resin composite material was obtained. Table 2 shows the raw material composition and evaluation results of the resin composite material.

<Comparative example 4>
Into an autoclave equipped with a stirrer, 100 g of inorganic particles F1 were charged and heated to 200 ° C. in a fluidized state by stirring. Next, after replacing the inside of the autoclave with nitrogen gas, 1.4 g of the surface treatment agent S11 was sprayed. After stirring for 1 hour, the system was purged with nitrogen to obtain surface-treated inorganic particles.

  Subsequently, the thermoplastic resin P3 was used instead of the thermoplastic resin P1, the blending amount of the inorganic particles was set as shown in Table 1, and the test temperature (melting temperature) was set to 360 ° C. The same as in Comparative Example 1. In this way, a resin composite material was obtained. Table 2 shows the raw material composition and evaluation results of the resin composite material.

<Comparative Examples 5-8>
The surface-treated inorganic particles used for the production of the resin composite material were produced in the same manner as in Comparative Example 1 except that the conditions were changed to those shown in Table 2. Subsequently, the thermoplastic resin P3 was used in place of the thermoplastic resin P1, the blending amount of the inorganic particles was set as shown in Table 2, and the test temperature (melting temperature) was set to 360 ° C. The same as in Comparative Example 1. In this way, a resin composite material was obtained. Table 2 shows the raw material composition and evaluation results of the resin composite material.

<Comparative Example 9>
A resin composite material was obtained in the same manner as in Example 11 except that the blending amount of the inorganic particles was changed to the conditions shown in Table 2. Table 2 shows the raw material composition and evaluation results of the resin composite material.

<Comparative Example 10>
A resin composite material was prepared in the same manner as in Example 11 except that the blending amount of the inorganic particles was changed to the conditions shown in Table 2. However, since the blending amount of the inorganic particles was too large, kneading was impossible and the resin composite material was used. Could not get. Table 2 shows the raw material composition and evaluation results of the resin composite material.

Claims (6)

(A) The surface represented by the following general formula (I) with respect to 100 parts by mass of a thermoplastic resin having a melting point or fluidization temperature in the range of 300 ° C. to 500 ° C. and having a main chain having an arylene group It is produced using 40 mass parts to 400 mass parts of inorganic particles surface-treated with a treating agent, and the average embedding rate shown in the following formula (1) is 55% or more. Resin composite material.
· General formula ^{(I) A-R 1 -SiR} 2 mBn
[In General Formula (I), A is an aromatic group, R ¹ is an organic group having 3 to 12 atoms constituting the straight chain portion, and R ² is a hydrocarbon group having 1 to 6 carbon atoms. And B is an alkoxy group having 1 to 6 carbon atoms, a halogen group, or an isocyanate group. Here, m and n are integers, the sum of m and n is 3, and m is an integer in the range of 0-2. ]
Formula (1) Average embedding rate (%) = 100 × {EP / (EP + V)}
[In the formula (1), EP is a polishing process that is performed by subjecting a test piece made of the resin composite material to a microtome polishing using a diamond knife, followed by a platinum deposition treatment, and then a platinum deposition treatment. When the surface is observed with a scanning electron microscope, it means the number {number / (10 μm × 10 μm)} of inorganic particles per 10 μm square area exposed in the polished surface subjected to the platinum vapor deposition treatment.
Further, V means the number of pores {10 / (10 μm × 10 μm)} per 10 μm square area formed by dropping the inorganic particles in the 10 μm square area where the EP value is counted.
Moreover, the said average embedding rate means the average value of the embedding rate each calculated | required in four measurement points. ] The resin composite material according to claim 1,
The inorganic particle surface-treated with the (B) surface treatment agent has an average particle diameter of 0.05 μm or more and 15 μm or less.   A dental material comprising the resin composite material according to claim 1.   A bone substitute material comprising the resin composite material according to claim 1. (A) 100 parts by mass of a thermoplastic resin having a melting point or fluidization temperature in the range of 300 ° C. to 500 ° C. and a main chain having an arylene group, and (B) a surface treatment agent represented by the following general formula (III) A method for producing a resin composite material, comprising at least a melt-kneading step of heating and melting and kneading a raw material containing 40 to 400 parts by mass of surface-treated inorganic particles.
- formula ^{(III) A-R 1 -SiR} 2 mBn
[In General Formula (III), A is an aromatic group, R ¹ is an organic group having 3 to 12 atoms constituting the straight chain portion, and R ² is a hydrocarbon group having 1 to 6 carbon atoms. And B is an alkoxy group having 1 to 6 carbon atoms, a halogen group, or an isocyanate group. Here, m and n are integers, the sum of m and n is 3, and m is an integer in the range of 0-2. ] In the manufacturing method of the resin composite material of Claim 5,
(B) The inorganic particle surface-treated with the surface treatment agent has an average particle diameter of 0.05 μm or more and 15 μm or less, and a method for producing a resin composite material.