JP2007113017A - Needle apatite reinforced resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition that has well-balanced physical properties, namely, high strength, rigidity, resistance to heat, toughness, and further having good welding strength retention, dimensional property, surface appearance, and reworking property. <P>SOLUTION: The resin composition comprises resin and needle apatite wherein the calcium (Ca) constituting the apatite in the resultant resin composition and a metals other than calcium (X) have a molar ratio of Ca/(Ca + X) = 0.70 to 1.00, and the average diameter (d) is less than 100 nm, further has particle shape of an average aspect ratio (L/d) of 5 or more, meaning the ratio of the average diameter (d)/the average length (L) thereby giving the needle apatite-reinforced resin composition. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention has high strength, rigidity and heat resistance suitable for industrial materials such as various machine industry parts and electrical and electronic parts, and is excellent in toughness, and is excellent in weld strength retention, dimensional characteristics, surface appearance and reworkability. The present invention relates to a resin composition comprising a resin and acicular apatite having a fine and high aspect ratio.

  Conventionally, blending an inorganic filler with a resin has been widely performed for the purpose of improving or improving the properties of the resin material. For example, inorganic fibrous fillers such as glass fibers and carbon fibers, inorganic particles such as talc, kaolin, mica, calcium carbonate, and wollastonite, or various inorganic fillers such as layered compounds such as mica, montmorillonite, and swellable fluorine mica A method for blending resin with resin is proposed, and some of these materials are used in general-purpose consumer fields such as packaging and containers, automobile fields, electrical / electronic fields, machinery / industrial fields, office equipment fields, aerospace It is used for various parts in fields.

However, according to these conventional techniques, although it is effective in terms of further improving the strength and rigidity of the obtained molded body, when an inorganic fibrous filler such as glass fiber or carbon fiber is used, the specific gravity of the product is low. There has been a problem in that it increases, the surface appearance and surface smoothness of the product decrease, and the toughness of the product decreases. In addition, wear of cylinders, screws, molds, etc. of extruders and molding machines during extrusion, molding, etc., or due to damage of inorganic fibrous filler due to recycling and rework, which are required due to increasing environmental needs in recent years, There was a problem that physical properties such as strength were greatly reduced and it could not be reused. In addition, when a layered compound such as mica, montmorillonite, or swellable fluorine mica is used, there is a problem that the weld strength of the molded body is remarkably reduced, and it may be difficult to use as an industrial material.
Therefore, strength, rigidity, heat resistance, and toughness suitable as industrial materials such as various machine industry parts and electrical and electronic parts different from conventional technologies are excellent, and weld strength retention, dimensional characteristics, surface appearance and A resin composition excellent in reworkability and having a good balance of physical properties has been industrially desired.

In order to solve the above problems, the present inventors proposed a resin composition comprising a polyamide resin and fine apatite as disclosed in Patent Document 1, and improved rigidity and strength without impairing toughness. Found polyamide. However, as a result of the study by the present inventors, since the shape of the fine apatite is spherical, the strength and rigidity are not sufficient in applications to various parts such as automobile parts, electronic electrical parts, industrial machine parts, etc. all right.
On the other hand, as a composition comprising a resin and apatite, Patent Document 2 discloses that a polyester resin and an average primary particle size of 5 to 200 nm, an average secondary particle size of 0.1 to 10 μm, and a relative secondary particle size A polyester composition comprising hydroxyapatite with a standard deviation of 0.95 or less is disclosed. Further, Patent Document 3 discloses a composition comprising a polymer resin and fibrous hydroxyapatite having an average fiber diameter of 5 to 20 μm and an average fiber length of 100 μm to 5 mm. The feature of the apatite taught here is fine in the former, but there is no description about the average aspect ratio of the apatite, and the latter has a high aspect ratio, but it can be said that the average diameter is large.

With regard to such a composition, according to the study by the present inventors, the strength, rigidity and heat resistance are not sufficient to be applicable to industrial parts, and toughness, weld strength retention, surface appearance, and reworkability. It was found that there was a bias in the balance including
By the way, regarding acicular apatite having a fine and high aspect ratio, Masahiro Yoshimura et al. Added an additive such as ethylenediaminetetraacetic acid to the method disclosed in Non-Patent Document 1, that is, low crystalline apatite. The hydrothermal synthesis method is disclosed, but according to the study by the present inventors, the yield is extremely low and it is difficult to use it industrially.
Therefore, in the prior art, a resin composition comprising a resin and an apatite having a fine and high aspect ratio is not known, and its characteristics are unknown.

International Publication No. 2000/011088 Pamphlet JP 2000-119495 A JP 63-132810 A The Chemical Society of Japan, 1991, (10), p. 1402-1407

  The object of the present invention is to provide a resin and acicular apatite that have high strength, rigidity, heat resistance, excellent toughness, excellent weld strength retention, dimensional characteristics, surface appearance, and reworkability that can solve the above problems. The apatite particle shape present in the obtained resin composition has an average diameter (d) of 100 nm or less, and the average diameter (d) and the average length Another object of the present invention is to provide a resin composition characterized by existing in a particle shape having an average aspect ratio (L / d) of 5 or more, which is a ratio to the thickness (L).

As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved by a resin composition comprising a resin and apatite having a specific shape and size, and have completed the present invention. .
That is, the present invention is as described below.

1. A resin composition comprising a resin and acicular apatite, wherein the molar ratio of calcium (Ca) and metal (X) other than calcium and calcium (Ca) constituting the apatite present in the obtained resin composition Ca / (Ca + X) is 0.70 to 1.00, the average diameter is 100 nm or less, and the average aspect ratio (L / d) is the ratio of the average diameter (d) to the average length (L) ) Is present in the resin composition in a particle shape of 5 or more.
2. 2. The needle according to 1 above, wherein an average aspect ratio (L / d), which is a ratio of an average diameter (d) to an average length (L), is present in the resin composition in a particle shape of 15 or more. -Like apatite-reinforced resin composition.
3. 1 or 2 above, wherein the molar ratio Ca / (Ca + X) of calcium (Ca) and the metal (X) other than calcium and calcium (Ca) constituting the acicular apatite is 0.75 to 0.98. The acicular apatite reinforced resin composition described in 1.
4). 1 or 2 above, wherein the molar ratio Ca / (Ca + X) of calcium (Ca) and the metal (X) other than calcium and calcium (Ca) constituting the acicular apatite is 0.80 to 0.95. The acicular apatite reinforced resin composition described in 1.
5. The resin is selected from polyamide resin, polyphenylene ether resin, polyoxymethylene resin, aliphatic polyester resin, aromatic polyester resin, aromatic polycarbonate resin, polyphenylene sulfide resin, polyolefin resin, styrene resin, acrylic resin, and rubber. 5. The acicular apatite reinforced resin composition according to any one of 1 to 4 above, which is at least one thermoplastic resin.
6). 1 from above, wherein the molar ratio (Ca + X) / P of phosphorus (P) constituting acicular apatite to calcium (Ca) and metal (X) other than calcium is 1.20 to 1.80. 4. The acicular apatite reinforced resin composition according to any one of 4 above.
7). Acicular apatite contains (A) a calcium compound having a molar ratio of phosphorus to calcium (P / Ca) of 0.1 or less, and (B) an ester compound of phosphoric acid or phosphorous acid. (C) water or hydrophilic It is obtained by mixing a solvent consisting of at least one selected from organic solvents into a raw material liquid, and hydrothermally synthesizing the raw material liquid at 120 ° C. or higher and under pressure. The acicular apatite reinforced resin composition according to 1.
8). The molar ratio Ca / (Ca + X) of the resin, calcium (Ca) and metal (X) other than calcium and calcium (Ca) is 0.70 to 1.00, and the average diameter (d) is 100 nm or less, And a resin obtained by blending acicular apatite having an average aspect ratio (L / d) of 5 or more, which is a ratio of the average diameter (d) and the average length (L), and A method for producing an acicular apatite-reinforced resin composition comprising acicular apatite.
9. The molar ratio Ca / (Ca + X) of the resin raw material, calcium (Ca) and the metal (X) other than calcium and calcium (Ca) is 0.70 to 1.00, and the average diameter (d) is 100 nm or less. And acicular apatite having an average aspect ratio (L / d) of 5 or more, which is a ratio of the average diameter (d) to the average length (L), is obtained by polymerization. A method for producing a needle-like apatite-reinforced resin composition comprising a resin and needle-like apatite.
10. 8 or 9 above, wherein the molar ratio Ca / (Ca + X) of calcium (Ca) and the metal (X) other than calcium and calcium (Ca) constituting the acicular apatite is 0.75 to 0.98. The manufacturing method of the acicular apatite reinforced resin composition as described in 2.
11. 8 or 9 above, wherein the molar ratio Ca / (Ca + X) of calcium (Ca) and the metal (X) other than calcium and calcium (Ca) constituting the acicular apatite is 0.80 to 0.95. The manufacturing method of the acicular apatite reinforced resin composition as described in 2.
12 The apatite to be blended includes (A) a calcium compound having a molar ratio of phosphorus to calcium (P / Ca) of 0.1 or less and (B) an ester compound of phosphoric acid or phosphorous acid, and (C) water or hydrophilicity. It is obtained by mixing a solvent consisting of at least one selected from organic solvents into a raw material liquid, and hydrothermally synthesizing the raw material liquid at 120 ° C. or higher and under pressure. The manufacturing method of the acicular apatite reinforced resin composition as described in any one of 8 to 11.
13. A resin, (A) a calcium compound having a phosphorus to calcium molar ratio (P / Ca) of 0.1 or less, and (B) an ester compound of phosphoric acid or phosphorous acid in (C) water or a hydrophilic organic solvent. 10. The apatite-reinforced resin according to claim 8, wherein the apatite-reinforced resin is obtained by mixing a raw material liquid mixed with at least one solvent selected from the above and heat-treating the resin in a molten state. A method for producing the composition.
14 (C) Water or a hydrophilic organic solvent containing a resin raw material, (A) a calcium compound having a molar ratio of phosphorus to calcium (P / Ca) of 0.1 or less, and (B) an ester compound of phosphoric acid or phosphorous acid The above 8 or 9 is obtained by mixing a raw material liquid mixed with at least one solvent selected from among the above, and simultaneously performing polymerization of resin and hydrothermal synthesis of apatite. A method for producing a needle-like apatite-reinforced resin composition.

  According to the present invention, it is possible to provide a resin composition having a high balance of physical properties that has high strength, rigidity, heat resistance, excellent toughness, and excellent weld strength retention, dimensional characteristics, surface appearance, and reworkability. .

Hereinafter, the present invention will be described in detail.
The present invention is a resin composition comprising a resin and acicular apatite, wherein the composition of the acicular apatite is calcium (Ca) and a molar ratio Ca / (Ca + X) of metal (X) and calcium (Ca) other than calcium. 0.70 to 1.00, the average diameter (d) is 100 nm or less, and the average aspect ratio (L / d) which is the ratio of the average diameter (d) to the average length (L) ) Is present in a particle shape of 5 or more.
Resins that are preferably used in the present invention are not particularly limited, but thermoplastic resins, rubbers, and thermosetting resins can be mentioned as preferable resins.

Examples of the thermoplastic resin include polyamide resin, polyphenylene ether resin, polyoxymethylene resin, aliphatic polyester resin, aromatic polyester resin, aromatic polycarbonate resin, polyphenylene sulfide resin, polyolefin resin, styrene resin, acrylic resin, aramid, Examples include condensation resins such as polyimide, polyether resins such as polysulfone, polyethersulfone, and polyetherketone, halogen-containing vinyl compound resins such as polyvinyl chloride, polyvinylidene chloride, polyvinyl fluoride, and polyvinylidene fluoride, and rubber. it can. The aliphatic polyester resin also includes polylactic acid known as a biodegradable polymer and polyglycolic acid.
In addition to these, thermosetting resins such as phenol resin, urea resin, melamine resin, epoxy resin, and silicone resin can also be used. These resins may be used alone or in combination of two or more.
In the present invention, among these resins, polyamide resin, polyphenylene ether resin, polyoxymethylene resin, aliphatic polyester resin, aromatic polyester resin, aromatic polycarbonate resin, polyphenylene sulfide resin, polyolefin resin, styrene resin, acrylic resin and At least one thermoplastic resin selected from rubber is more preferably used.

  Apatite is a compound composed of calcium and phosphorus, also known as a component of human bones. In general, it is known that calcium and / or phosphorus atoms are present in excess of the theoretical amount, or vice versa. ing. Therefore, the shape of the apatite can take various shapes such as a spherical shape, a hexagonal column shape, a needle shape, and a plate shape. In the present invention, it is an apatite having a remarkable resin reinforcing effect, an average diameter of 100 nm or less and an average aspect ratio of 5 or more, that is, a resin composition comprising acicular apatite and a resin.

  In the present invention, the acicular apatite has a shape such as a needle shape, a cylindrical shape, or a hexagonal column shape, and has an average diameter of 100 nm or less, preferably 75 nm or less, and most preferably 50 nm or less. And an average aspect ratio of 5 or more, preferably 10 or more, more preferably 15 or more, and most preferably 20 or more, is not particularly limited. Here, in the present invention, the length of the longest axis (long side) in the apatite shape is defined as “length L”, and the length of the shortest axis corresponding thereto is defined as “diameter d”.

In the present invention, the average length, the average diameter, and the average aspect ratio are such that when the number of apatite particles having a length Li and a diameter di is Ni in a unit volume,
Average length L = ΣLi ² Ni / ΣLiNi
Average diameter d = Σdi ² Ni / ΣdiNi
Average aspect ratio L / d = (ΣLi ² Ni / ΣLiNi) / (Σdi ² Ni / ΣdiNi)
Can be defined as
Hereinafter, the needle shape used in the present invention will be described in detail. In general, apatite is represented by the following general formula (I).
(M) _10-z (HPO ₄ ) _z (PO ₄ ) _6-z (Y) _2-z · nH ₂ O (I)
In the formula, 0 ≦ z ≦ 2, 0 ≦ n ≦ 16, (M) is a metal element, and (Y) is an anion or an anion compound.

The metal element (M) is preferably calcium (Ca) from the viewpoint of crystal stability.
Calcium and metal elements (X) other than calcium, such as elements 1, 2 (excluding calcium), 3, 4, 5, 6, 7, 8, 11, 12, 13 of the periodic table of elements and tin, lead And a mixture thereof. Among them, the metal element other than calcium is particularly preferably magnesium, strontium, barium, lead, nickel, aluminum, copper, iron, or a mixture of two or more of these.
The anion or anions compound represented by (Y), hydroxyl ions (OH @ -), fluoride ion (F ^-), chloride ion (CL ^-) and the like. These anionic elements or anionic compounds may be one kind or two or more kinds. Carbonate-containing apatite in which hydrogen phosphate ion (HPO ₄ ²⁻ ), phosphate ion (PO ₄ ³⁻ ), or (Y) in the above general formula is substituted with carbonate ion (CO ₃ ²⁻ ) It may be.

The apatite used in the present invention has an average diameter (d) which is a composition represented by the above general formula of 100 nm or less, and an average aspect ratio which is a ratio of the average diameter (d) to the average length (L). It is acicular apatite with a ratio (L / d) of 5 or more, but the stoichiometric ratio of metal (M) to phosphorus (P), that is, (Ca + X) / P, where X is a metal other than calcium. It may be a metal or phosphorus defect type apatite deviating from 1.67. In order to obtain finer and higher aspect ratio acicular apatite, (Ca + X) / P is preferably 1.20 to 1.80, more preferably 1.25 to 1.75, most preferably 1. .30 to 1.70.
Furthermore, the apatite used in the present invention has a ratio of calcium in the metal element (M), that is, a molar ratio Ca / (Ca + X) between calcium (Ca) and a metal (X) other than calcium and calcium (Ca). , Preferably 0.70 to 1.00, more preferably 0.75 to 0.98, and most preferably 0.80 to 0.95. If it is out of the above range, it tends to be harder to become finer and acicular apatite.

Quantification of metal elements such as calcium and phosphorus in the apatite used in the present invention can be carried out using high frequency inductively coupled plasma (ICP) emission analysis.
More specifically, in the case of calcium as the metal element, 0.5 g of the resin composition of the present invention is weighed in a platinum dish and carbonized in a 500 ° C. electric furnace. After cooling, 5 mL of hydrochloric acid and 5 mL of pure water are added and boiled and dissolved on a heater. After cooling again, pure water is added to make 500 mL, and quantified at a wavelength of 317.933 nm by high frequency inductively coupled plasma (ICP) emission analysis. Other metal elements can be quantified by the same method by selecting the characteristic wavelength.
Phosphorus is quantitatively determined by weighing 0.5 g of the resin composition of the present invention, adding 20 mL of concentrated sulfuric acid, wet-decomposing on a heater, cooling, adding 5 mL of hydrogen peroxide, and heating on the heater. Concentrate to 3 mL. The solution is cooled again to 500 mL with pure water, and quantified at a wavelength of 213.618 (nm) by high frequency inductively coupled plasma (ICP) emission analysis. Based on the quantitative results thus obtained, the molar ratio between the metal element such as calcium and phosphorus can be calculated.

Among the apatites used in the present invention, the method for producing acicular apatite having an average diameter of 100 nm or less and an average aspect ratio of 5 or more is not particularly limited, but is obtained in a higher yield. From
(Production method-1) (A) A calcium compound having a molar ratio of phosphorus and calcium (P / Ca) of 0.1 or less and (B) an ester compound of phosphoric acid or phosphorous acid, (C) water or hydrophilic A high aspect ratio characterized in that it is mixed with a solvent comprising at least one selected from organic organic solvents to obtain a raw material liquid, and the raw material liquid is hydrothermally synthesized at 120 ° C. or higher and under pressure. Production method of acicular apatite particles,

Hereinafter, Production Method-1 will be described in detail.
Manufacturing method-1
(A) described in production method-1 is not particularly limited as long as the molar ratio of phosphorus to calcium (P / Ca) is a calcium compound of 0.1 or less. Preferred examples include calcium carbonate and water. Slightly soluble calcium compounds such as calcium oxide and calcium fluoride, water-soluble calcium compounds such as calcium chloride, calcium nitrate, calcium formate and calcium acetate, ethylenediaminetetraacetic acid calcium complex, cyclohexanediaminetetraacetic acid calcium complex, glycol ether diamine tetraacetic acid calcium Complexes, calcium complex compounds such as calcium diethylenetriaminepentaacetate, salts with carboxylic acids such as fumaric acid, tartaric acid, malic acid, and succinic acid, and mixtures thereof can be mentioned. Among these, water-soluble calcium compounds such as calcium chloride, calcium nitrate, calcium formate, and calcium acetate are preferable from the viewpoint of obtaining finer and higher aspect acicular apatite. These may be used alone or in combination of two or more.
In addition to the calcium compound having a molar ratio (P / Ca) of phosphorus and calcium of (A) of 0.1 or less, a metal compound containing a metal element other than calcium may be added.

The metal element is not particularly limited as long as it is a metal element other than calcium. Specifically, 1, 2 (excluding calcium), 3, 4, 5, 6, 7, 8, Mention may be made of group elements 11, 12, 13 and metal elements other than calcium, such as tin and lead.
The metal compound containing the metal element is not particularly limited as long as it is a metal compound excluding calcium, but preferred examples include metal hydroxides (magnesium hydroxide, strontium hydroxide, barium hydroxide, hydroxide). Lithium, sodium hydroxide, potassium hydroxide, aluminum hydroxide, iron hydroxide, manganese hydroxide, etc.), metal chloride (magnesium chloride, strontium chloride, barium chloride, lithium chloride, sodium chloride, potassium chloride, aluminum chloride, chloride) Iron, manganese chloride), metal fluoride (magnesium fluoride, barium fluoride, strontium fluoride, lithium fluoride, sodium fluoride, potassium fluoride, aluminum fluoride, etc.), metal bromide (potassium bromide, etc.), Metal iodide (potassium iodide, iodine Copper), metal oxides (magnesium oxide, aluminum oxide, etc.), metal carbonates (magnesium carbonate, strontium carbonate, barium carbonate, lithium carbonate, sodium carbonate, potassium carbonate, aluminum carbonate, etc.), metal sulfates (potassium sulfate, etc.) ), Inorganic metal compounds such as metal nitrates (such as potassium nitrate) and metal silicates (such as sodium hexafluorosilicate), compounds of metal elements and monocarboxylic acids (such as copper acetate and aluminum stearate), metal elements And a compound of a dicarboxylic acid (such as potassium adipate), a compound of a metal element and a tricarboxylic acid (such as potassium citrate), or a mixture thereof. Among these, it is preferable to use magnesium, strontium, barium, lead, nickel, aluminum, copper, iron, or a mixture of two or more thereof.
When mixing the calcium compound and a metal compound comprising a metal other than calcium, that is, the molar ratio Ca / (Ca + X) of calcium (Ca) and the metal (X) other than calcium and calcium (Ca) is: Preferably it is 0.70 to 1.00, More preferably, it is 0.75 to 0.98, Most preferably, it is 0.80 to 0.95. If it is out of the above range, it tends to be difficult to obtain fine and high aspect ratio acicular apatite.

In (B) described in Production Method-1, the ester compound of phosphoric acid or phosphorous acid is not particularly limited, but a preferable phosphoric acid ester compound is represented by the following general formula (II).
(RO) _n PO (OH) _3-n (II)
Here, n represents 1, 2 or 3, and R is preferably an alkyl group, a phenyl group, or a substituted alkyl group in which a part of these groups is substituted with a hydrocarbon group or the like. The (RO) groups in the general formula (II) may be the same or different. Examples of R include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, t-butyl group, n-pentyl, n-hexyl, n-octyl group, 2-ethylhexyl group, decyl group, lauryl group, tridecyl group, stearyl group, oleyl group and other aliphatic groups, phenyl group, biphenyl group and other aromatic groups, hydroxy group, methyl group, ethyl group, propyl group, t -The aromatic group etc. which have substituents, such as a butyl group, a nonyl group, a methoxy group, an ethoxy group, etc. can be mentioned.

  Among these, more preferred are specifically trimethyl phosphate, triethyl phosphate, tripropyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, tris phosphate (2-ethylhexyl), Triphenyl phosphate, diphenyl cresyl phosphate, tricresyl phosphate, biphenyl phosphate, tris phosphate (2,4-di-t-butylphenyl), tris phosphate (1,5-di-t-butylphenyl) , Tris (dimethylphenyl) phosphate, tris (isopropylphenyl) phosphate, octyldiphenyl phosphate, or a mixture thereof. Most preferred are trimethyl phosphate, triethyl phosphate, tripropyl phosphate, tributyl phosphate or mixtures thereof.

Moreover, a preferable phosphite compound is represented by the following general formula (III).
(RO) _n P (OH) _3-n (III)
Here, n and R are synonymous with n and R in the general formula (II), respectively. The (RO) groups in the general formula (III) may be the same or different.
Among these, more preferred are specifically ethyl phosphite, diethyl phosphite, dipropyl phosphite, dibutyl phosphite, diphenyl phosphite, trimethyl phosphite, triethyl phosphite, Tripropyl phosphate, tributyl phosphite, trioctyl phosphite, tributoxyethyl phosphite, tris phosphite (2-ethylhexyl), triphenyl phosphite, diphenyl cresyl phosphite, tricresyl phosphite, Biphenyl phosphite, tris phosphite (2,4-di-t-butylphenyl), tris phosphite (1,5-di-t-butylphenyl), tris phosphite (dimethylphenyl), phosphorous Examples thereof include tris (isopropylphenyl) acid, octyldiphenyl phosphite, and the like, or a mixture thereof.
In the present invention, the phosphate ester or the phosphite ester may be used alone or in combination of two or more, for example, a mixture of triethyl phosphate and triphenyl phosphite. It doesn't matter.

  The blending ratio of the calcium compound (P / Ca) in the production method-1 (P / Ca) of 0.1 or less and (B) phosphoric acid or phosphorous acid ester compound is particularly limited. However, from the viewpoint of efficiently obtaining the target apatite, the molar ratio of calcium to phosphorus (Ca / P) is preferably in the range of 1.0 to 2.0, and 1.20. The range of ˜1.90 is more preferable, and the range of 1.33 to 1.70 is most preferable. When Ca / P is out of the above range, fine and high aspect ratio acicular apatite tends to be difficult to obtain.

  (C) described in production method-1 is not particularly limited as long as the hydrophilic organic solvent in the solvent composed of at least one selected from water or a hydrophilic organic solvent is a solvent compatible with water. However, preferred examples include alcohol solvents such as methanol, ethanol and ethylene glycol, amide solvents such as N, N-dimethylformamide and acetylacetamide, acetone, ether, dimethyl sulfoxide and the like, or mixtures thereof. Can be mentioned. Further, water and the above-mentioned hydrophilic organic solvent may be mixed and used. The blending ratio in the case of mixing is not particularly limited, but it is preferable that both are not phase-separated.

  In the production method-1, an organic compound having at least one carboxyl group in the molecular structure may be added for the purpose of obtaining finer high aspect ratio acicular apatite having a higher aspect ratio. Examples thereof include carboxylic acids and ester compounds thereof, carboxylic acids having amino groups and salts thereof or ester compounds thereof, lactams, acid anhydrides, and acyl halides.

  Although it does not specifically limit as said carboxylic acid, Monocarboxylic acids, dicarboxylic acids, polyhydric carboxylic acids, etc. can be mentioned. Examples of monocarboxylic acids include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, capric acid, undecylic acid, lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, heptadecylic acid, stearic acid, Nonadecanoic acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, heptacosanoic acid, aliphatic monocarboxylic acid such as montanic acid, mellicic acid, lacteric acid, isobutyric acid, alicyclic monocarboxylic acid such as cyclohexanecarboxylic acid, benzoic acid Examples thereof include aromatic monocarboxylic acids such as acid, toluic acid, α-naphthalenecarboxylic acid, β-naphthalenecarboxylic acid, methylnaphthalenecarboxylic acid, and phenylacetic acid.

Examples of dicarboxylic acids include oxalic acid, malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, 2-methyladipic acid, trimethyladipic acid, pimelic acid, 2,2-dimethylglutaric acid, 3,3 -Diethylsuccinic acid, azelaic acid, sebacic acid, suberic acid, dodecanedioic acid, eicodioic acid, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid, 5 -Sodium sulfoisophthalic acid, hexahydroterephthalic acid, hexahydroterephthalic acid, diglycolic acid, cyclohexanedicarboxylic acid and the like.
Examples of polyvalent carboxylic acids include ethylenediaminetetraacetic acid, cyclohexanediaminetetraacetic acid, glycol etherdiaminetetraacetic acid, diethylenetriaminepentaacetic acid, and the like.
Examples of the carboxylic acid ester compounds include methyl esters and ethyl esters of the carboxylic acids.

Carboxylic acids having an amino group are not particularly limited, and examples thereof include 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, and paraaminomethylbenzoic acid. Examples of the carboxylic acid salts having an amino group include hydrochlorides, sulfates, and phosphates of the carboxylic acids having an amino group.
Examples of the ester compounds of carboxylic acid having an amino group include methyl ester compounds and ethyl ester compounds of the carboxylic acids having an amino group.
Although it does not specifically limit as lactams, For example, a butyl lactam, a pivalolactam, a caprolactam, a capril lactam, an enantolactam, an undecanolactam, a dodecanolactam etc. can be mentioned.
The acid anhydrides are not particularly limited, and examples include acetic anhydride, benzoic anhydride, and phthalic anhydride.
Examples of the acyl halides include, but are not limited to, acetyl chloride, propyl chloride, terephthalic acid chloride, and isophthalic acid chloride.

  These organic compounds having at least one carboxyl group in the molecular structure may be used singly or in combination of two or more. Among them, carboxylic acids and acid anhydrides are preferably used for the purpose of obtaining fine high aspect ratio acicular apatite having a high aspect ratio, and monocarboxylic acids and dicarboxylic acid compounds are most preferable. Furthermore, (A) It is preferable that the mass ratio of the said organic compound with respect to a calcium compound is 0.01-20, More preferably, it is 0.1-10, Most preferably, it is 0.3-5.

The mixed raw material concentration in the raw material liquid, that is, the total mass ratio of (A) and (B) to the total mass of (C) is not particularly limited, but the mixed raw material concentration at which the raw material liquid is uniformly dissolved or suspended. Can be arbitrarily selected and used. Preferably, the total mass of (A) and (B) is 1 to 200 parts by mass, and more preferably 5 to 100 parts by mass, with respect to 100 mass parts of the total mass of (C).
The order and method for blending (A), (B), and (C) constituting the raw material liquid are not particularly limited. Further, they may be mixed while being stirred by a stirrer, ultrasonic waves, or a homogenizer.
The temperature at which (A) and (B) are blended with the solvent (C) is preferably less than 100 ° C., more preferably less than 70 ° C., and even more preferably less than 40 ° C. from the viewpoint of ease of handling. is there.

Hydrothermal synthesis in Production Method-1 is hydrothermal synthesis performed under a temperature condition of 120 ° C. or higher and under a pressurized condition.
The hydrothermal synthesis temperature is in the range of 120 ° C. or higher, but is preferably 150 ° C. to 400 ° C., more preferably 200 ° C. from the viewpoint of efficiently obtaining fine and high aspect ratio acicular apatite. ~ 375 ° C.
Moreover, the pressure of hydrothermal synthesis is not particularly limited as long as it is under pressure, but from the viewpoint of efficiently obtaining fine and high aspect ratio acicular apatite, it is preferably 0.5 MPa or more, more Preferably it is 1.0 MPa or more, further 1.5 MPa or more, and most preferably 2.0 MPa or more.
The method of hydrothermal synthesis is not particularly limited. For example, after the raw material liquid is sealed in a reaction vessel such as an autoclave and replaced with an inert gas such as nitrogen, the saturated water vapor pressure is sealed under the above temperature condition. It is possible to use a method performed under moderate pressure conditions, a method of extracting water or a hydrophilic solvent from the reaction vessel during hydrothermal synthesis, a method performed at a pressure lower than the saturated water vapor pressure, or a method combining these. .

The apparatus for hydrothermal synthesis used in the present invention can use a pressure-resistant reaction vessel such as an autoclave, and is not particularly limited. Among these, from the viewpoint of obtaining acicular apatite particles having a high aspect ratio, an autoclave type reaction vessel equipped with a stirring device is most preferable.
The hydrothermal synthesis time can be arbitrarily determined in order to complete the reaction, but it is preferably 2 hours or longer, more preferably 4 hours or longer.
In the present invention, the high-aspect ratio acicular apatite-containing slurry obtained by synthesizing the apatite obtained by the production method-1 may be used after being separated by centrifugation, filtration, or the like. There is no problem.

In the present invention, the average diameter (d) produced by the production method-1 or the like is 100 nm or less, and the average aspect ratio (ratio) between the average diameter (d) and the average length (L) ( An apatite slurry having an L / d) of 5 or more can be used by adding a dispersant or a coupling agent, if necessary, for the purpose of stabilizing for a long time or improving the dispersibility with the resin.
The dispersant is not particularly limited, and a known dispersant can be used. For example, anionic surfactants and cationic surfactants as described on pages 232 to 237 of “Elucidation of dispersion / aggregation and applied technology, 1992” (supervised by Fumio Kitahara, published by Techno System Co., Ltd.) Amphoteric surfactants, nonionic surfactants and the like can be used.
Of these, anionic surfactants and nonionic surfactants are preferably used. Particularly, from the viewpoint of price and physical properties, sodium citrate, sodium polyacrylate, ammonium polyacrylate, sucrose stearate, etc. It is more preferable to use the sucrose esters.

The coupling agent is not particularly limited, and a known coupling agent can be used. Among these, silane coupling agents and titanium coupling agents can be mentioned as preferable ones.
Silane coupling agents include triethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (1,1-epoxycyclohexyl) Ethyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyl-tris (2-methoxy-ethoxy) silane, N-methyl-γ-aminopropyltrimethoxysilane, N-vinylbenzyl-γ- Aminopropyl Riethoxysilane, triaminopropyltrimethoxysilane, 3-ureidopropyltrimethoxysilane, 3-4,5 dihydroimidazolepropyltriethoxysilane, hexamethyldisiloxane, N, O- (bistrimethylsilyl) amide, N, N- Examples thereof include bis (trimethylsilyl) urea and mixtures thereof.
Among these, γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (1,1-epoxycyclohexyl) ethyltrimethoxy Amino silanes such as silanes and epoxy silanes are preferably used because they are economical and easy to handle.

Titanium-based coupling agents include isopropyl triisostearoyl titanate, isopropyl tridodecyl benzene sulfonyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, tetraisopropyl bis (dioctyl phosphite) titanate, tetraoctyl bis (ditridecyl phosphite) titanate, Tetra (1,1-diallyloxymethyl-1-butyl) bis (ditridecyl) phosphite titanate, bis (dioctylpyrophosphate) oxyacetate titanate, bis (dioctylpyrophosphate) ethylene titanate, isopropyltrioctanoyl titanate, isopropyldimethacrylic Isostearoyl titanate, isopropyl isostearoyl diacryl titanate, isoprene Pirutori (dioctyl phosphate) titanate, isopropyl tricumylphenyl titanate, isopropyl tri (N- amidoethyl, aminoethyl) titanate, dicumyl phenyloxy acetate titanate, etc. diisostearoyl ethylene titanate, or can be mixtures thereof.
These dispersants are preferably added in the range of 0.001 to 100 parts by mass, more preferably in the range of 0.01 to 20 parts by mass, and 0.05 to 10 parts by mass with respect to 100 parts by mass of the apatite. A range is most preferred.

  In the present invention, an average aspect ratio (L / L), which is manufactured by the above-described manufacturing method or the like, has an average diameter (d) of 100 nm or less, and is a ratio between the average diameter (d) and the average length (L). When the apatite having d) of 5 or more is used in the form of powder, the powdery apatite obtained by the above method is surface-treated for the purpose of improving the dispersibility in the resin and improving the interfacial adhesion with the resin. Surface treatment with an agent may be performed.

The surface treatment can be performed using a surface treatment agent such as a silane coupling agent, a titanium coupling agent, or a film forming agent.
Film forming agents include urethane polymers, acrylic polymers, maleic anhydride and ethylene, styrene, α-methylstyrene, butadiene, isoprene, chloroprene, 2,3 dichlorobutadiene, 1,3-pentadiene, cyclooctadiene, etc. And polymers such as copolymers with unsaturated monomers, epoxy polymers, polyester polymers, vinyl acetate polymers, and polyether polymers. Of these, urethane polymers, acrylic acid polymers, butadiene maleic anhydride copolymers, ethylene maleic anhydride copolymers, styrene maleic anhydride copolymers, and mixtures thereof are particularly preferably used from the viewpoint of excellent economy and performance.

  The surface treatment of apatite with such a coupling agent and a film forming agent can be performed by a known method. That is, the organic solvent solution or suspension of the coupling agent and the film forming agent is applied as a sizing agent on the surface of the apatite, and is applied using a Henschel mixer, a super mixer, a ready mixer, a V-type blender, or the like. Examples thereof include dry mixing, spraying method applied by spraying, integral blending method and dry concentrate method. Moreover, the method of combining these methods, for example, the method of spraying the remaining film forming agent after apply | coating a coupling agent and a part of film forming agent by a sizing process etc. can also be mentioned. Among these, from the viewpoint of being excellent in economic efficiency, a sizing treatment, a dry mixing method, a spray method, and a method combining these are preferably used.

Although the manufacturing method of the resin composition of the present invention is not particularly limited, for example,
(Manufacturing method-a) Resin and the average aspect ratio (L / d) which are ratios of the average diameter (d) and average length (L) whose average diameter (d) manufactured beforehand is 100 nm or less ) Is a method of obtaining the resin composition by blending acicular apatite having 5 or more,
(Manufacturing method-b) A resin raw material and an average aspect ratio (L / L) which is a ratio of the average diameter (d) and the average length (L), and the average diameter (d) manufactured in advance is 100 nm or less. d) A method of blending and polymerizing acicular apatite having 5 or more to obtain the resin composition,
Etc.
Hereinafter, production methods -a to b will be described.

Manufacturing method-a
In this production method-a, the average aspect ratio (L / L) of the resin and the average diameter (d) produced in advance is 100 nm or less and the ratio between the average diameter (d) and the average length (L). This is a method obtained by blending apatite having d) of 5 or more. As the apatite, the slurry or powder produced by the production method-1 can be used.
Examples of the method of blending include a method of producing by melt-kneading with a resin, a method of mixing in a resin and a solution, and the like. Moreover, after making into a masterbatch which contains this apatite of high concentration in resin using said method, the method of mixing a masterbatch and resin may be sufficient. Furthermore, these methods may be combined as necessary.
The blending ratio of the resin and the apatite at that time is not particularly limited, but is preferably 0.01 to 1000 parts by mass, more preferably 0.05 to 500 parts by mass with respect to 100 parts by mass of the resin. Most preferably, it is 0.1 to 300 parts by mass.

Among the above production methods, in the case of producing by melt-kneading, generally used kneaders can be applied as an apparatus for performing melt-kneading. For example, a single-screw or multi-screw kneading extruder, a roll, a Banbury mixer, etc. may be used. Among these, a twin-screw extruder equipped with a decompression device and side feeder equipment is most preferable. As for the melt-kneading method, all the components may be kneaded at the same time, a method of kneading using a pre-kneaded blend, or each component may be fed sequentially from the middle of the extruder and kneaded. Moreover, when adding this apatite in the state of a slurry, it is preferable to feed from the middle of an extruder using a liquid addition pump.
The conditions for melt kneading are not particularly limited, but the degree of reduced pressure is preferably 0 to 0.07 Mpa. The kneading temperature is preferably 1 to 100 ° C. higher than the melting point or softening point obtained by differential scanning calorimetry (DSC) measurement according to JISK7121. The shear rate in the kneader is preferably 100 (SEC ⁻¹ ) or more, and the average residence time during kneading is preferably 1 to 15 minutes. The solvent in the resin composition is preferably 1% by mass or less. If it is within the above-mentioned range, the productivity, the processability, the appearance of the obtained molded product is not sufficient, and the effect of improving the physical properties is not likely to occur. .

Manufacturing method-b
In this production method-b, an average aspect ratio (L) which is a ratio of the resin raw material and the previously produced average diameter (d) of 100 nm or less and the average diameter (d) and the average length (L). This is a method obtained by blending and polymerizing apatite having a / d) of 5 or more. The apatite can be used in the form of a slurry or powder produced by the above-mentioned apatite production method-1.
Examples of the method of blending into the resin raw material include a method of adding the apatite directly to the resin raw material powder and its solution, and a method of dispersing the apatite in a solvent and adding it to the resin raw material as a slurry. Furthermore, after the apatite powder or slurry is added during the polymerization process of the resin raw material, the polymerization may be continued. At that time, the blending ratio of the resin raw material and the apatite is not particularly limited, but is preferably 0.01 to 1000 parts by mass, more preferably 0.05 to 500 parts by mass with respect to 100 parts by mass of the resin. Parts, most preferably from 0.1 to 300 parts by weight.

There is no restriction | limiting in particular regarding the polymerization method of resin, A well-known method can be used. For example, when polyamide is used as the resin, it is preferable to first mix the polyamide raw material and the apatite and then polymerize the polyamide.
The blending method of the polyamide raw material and the apatite may be any of a method of directly mixing the solid polyamide raw material and the apatite, a method of blending an aqueous solution of the polyamide raw material and the apatite slurry, or the like.

In the present invention, the polyamide polymerization method is not particularly limited, and a known method can be used. For example, a method in which a component hardly soluble in water such as 11-aminoundecanoic acid is used as a raw material and heated at 200 to 290 ° C. for polycondensation, an aqueous ε-caprolactam solution is used as a raw material, and end-capping such as a monocarboxylic acid is used as necessary A ring-opening polycondensation method of lactams that is polycondensed by heating to 200-290 ° C. while adding an inert gas or a reaction accelerator such as ε-aminocaproic acid, and an aqueous hexamethylene adipamide solution The aqueous salt solution of the diamine component and dicarboxylic acid component is heated and concentrated to 200 to 290 ° C., and the generated water vapor pressure is maintained at an appropriate pressure of 10 to 20 atmospheres. Finally, the pressure is released, A hot melt polycondensation method in which polycondensation is performed under normal pressure or reduced pressure can be used.
Furthermore, a solid phase polymerization method performed at a temperature below the melting point of a solid salt or polycondensate composed of a diamine component and a dicarboxylic acid component, a solution method in which a dicarboxylic acid halide component and a diamine component are polycondensed in a solution, and the like are used. Can do. These methods may be combined as necessary. The polymerization form may be batch or continuous. The polymerization apparatus is not particularly limited, and a known apparatus such as an autoclave type reactor, a tumbler type reactor, an extruder type reactor such as a kneader, or the like can be used.

  Confirmation of the apatite in the resin composition of the present invention is, for example, a method of directly confirming by wide-angle X-ray diffraction or the like using a pellet or molded product of the resin composition, or the resin is soluble in the pellet or molded product. The resin may be removed by immersion in a solvent, and the remaining components may be confirmed by wide-angle X-ray diffraction, infrared absorption spectrum, or the like. In the case of wide-angle X-ray diffraction, when the metal element is apatite, which is calcium, observed at about 25.9, 31.7, and 32.6 (degrees) at 2θ (002), (211), and ( The presence of apatite can be confirmed by the presence of a peak due to the (300) plane.

The resin composition of the present invention may be dispersed in a state where the apatite in the resin is aggregated in the micrometer size, but from the viewpoint of the effect of improving the physical properties, the resin composition is uniformly dispersed in the nanometer size. Is preferred.
In the resin composition of the present invention, the apatite in the resin has an average diameter (d) of 100 nm or less, and an average aspect ratio (L / L) which is a ratio of the average diameter (d) to the average length (L). d) exists in a particle shape of 5 or more.

The confirmation of the dispersion state of the apatite in the resin and the measurement of the average diameter (d) and the average length (L) were conducted with a transmission electron microscope (TEM) using pellets and molded articles of the resin composition. It can be performed by a method of observing and measuring.
More specifically, ultra-thin sections of 20 to 80 nm are prepared from resin composition pellets and molded articles, and bright field images are taken at a magnification of 1 to 100,000 using a transmission electron microscope (TEM). It can be determined by observing the dispersion state of at least 100 apatites.
When Ni apatites having a length Li and a diameter di are present in a unit volume from the bright field image obtained by the above method, the average diameter and the average aspect ratio can be obtained by the following equations.
Average length L = ΣLi ² Ni / ΣLiNi
Average diameter d = Σdi ² Ni / ΣdiNi
Average aspect ratio L / d = (ΣLi ² Ni / ΣLiNi) / (Σdi ² Ni / ΣdiNi)

  The content of the apatite in the resin composition of the present invention is preferably 0.01 to 1000 parts by mass, more preferably 0.05 to 500 parts by mass, and most preferably 0.1 to 300 parts by mass with respect to 100 parts by mass of the resin. Part by mass. The content of the apatite can be determined from, for example, the loss of ignition (Ig. Loss) of a resin composition pellet or molded product according to JIS R3420 and the mass reduction amount. Specifically, after sufficiently drying the resin composition, about 1 g is weighed in a platinum dish, ashed in an electric furnace at 650 ± 20 ° C., cooled, weighed, and quantified for apatite content. In order to exert the effect of improving the properties of the resin, it is preferable that at least 0.01 part by mass of apatite is contained with respect to 100 parts by mass of the resin, and 1000 parts by mass or less is better considering moldability.

If necessary, a moldability improving agent may be added to the resin composition according to the present invention as long as the object of the present invention is not impaired. The moldability improver is higher fatty acid, higher fatty acid ester, higher fatty acid amide compound, polyalkylene glycol or its terminal modified product, low molecular weight polyethylene or oxidized low molecular weight polyethylene, substituted benzylidene sorbitol, polysiloxane, caprolactone, inorganic crystal nucleus. It is at least one compound selected from compounds consisting of agents.
A degradation inhibitor may be added to the resin composition of the present invention for the purpose of further thermal degradation, prevention of discoloration during heating, heat aging resistance, and weather resistance. The deterioration inhibitor is at least one compound selected from phenolic stabilizers such as hindered phenol compounds, phosphite stabilizers, hindered amine stabilizers, triazine stabilizers, and sulfur stabilizers.

A colorant may be added to the resin composition of the present invention. The colorant includes a dye such as nigrosine, a pigment such as titanium oxide or carbon black, or metal particles such as aluminum, colored aluminum, nickel, tin, copper, gold, silver, platinum, iron oxide, stainless steel, and titanium, manufactured by Mica It is at least one colorant selected from metallic pigments such as pearl pigments, color graphite, color glass fibers, and color glass flakes.
A conductive carbon black may be added to the resin composition of the present invention. The conductive carbon black is at least one carbon black selected from acetylene black, ketjen black, carbon nanotubes, and the like, and among them, those having a good chain structure and a high aggregation density are preferable.

A flame retardant may be added to the resin composition of the present invention. The flame retardant is preferably a non-halogen flame retardant or a bromine flame retardant.
The non-halogen flame retardant is a phosphorus flame retardant such as red phosphorus, ammonium phosphate, or ammonium polyphosphate, aluminum hydroxide, magnesium hydroxide, dolomite, hydrotalcite, calcium hydroxide, barium hydroxide, basic Hydrate of metal hydroxides or inorganic metal compounds such as magnesium carbonate, zirconium hydroxide, tin oxide, zinc stannate and zinc hydroxystannate, and borate compounds such as zinc borate, zinc metaborate and barium metaborate Inorganic compound flame retardants such as melamine, melam, melem, melon (product of 3 to 3 molecules of melem deammonia above 300 ° C), melamine cyanurate, melamine phosphate, melamine polyphosphate, succinoguanamine, Adipoguanamine, methylglutalogamine, melami Triazine-based flame retardant such as a resin, at least one flame retardant selected from silicone-based flame retardants such as silicone resin, silicone oil, silica.
The brominated flame retardant is at least one flame retardant selected from compounds consisting of brominated polystyrene, brominated polyphenylene ether, brominated bisphenol type epoxy polymer, and brominated crosslinked aromatic polymer.

An inorganic filler may be added to the resin composition of the present invention. The inorganic filler is selected from glass fiber, carbon fiber, wollastonite, talc, mica, kaolin, barium sulfate, calcium carbonate, apatite, sodium phosphate, fluorite, silicon nitride, potassium titanate, molybdenum disulfide, etc. At least one inorganic filler.
Since the resin composition of the present invention is excellent in various molding processability, a known molding method such as press molding, injection molding, gas assist injection molding, welding molding, extrusion molding, blow molding, film molding, hollow molding, multilayer molding. Even a generally known plastic molding method such as foam molding or melt spinning can be used for satisfactory molding.
The resin composition of the present invention has high strength, rigidity, heat resistance, excellent toughness, and excellent weld strength retention, dimensional characteristics, surface appearance, and reworkability. Applications to various parts in the automotive field, electrical / electronic field, machine / industrial field, office equipment field, aerospace field, etc. are expected.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not restrict | limited to a following example. The evaluations described in the following examples and comparative examples were carried out by the following methods.
(1) Number average molecular weight (Mn)
It was determined by gel permeation chromatography (GPC). The instrument is HLC-8020 manufactured by Tosoh Corporation, the detector is a differential refractometer (RI), the solvent is hexafluoroisopropanol (HFIP), the column is two TSKgel-GMHHR-H manufactured by Tosoh Corporation and one G1000HHR. Using. The solvent flow rate was 0.6 ml / min, and the sample concentration was 1 to 3 (mg sample) / 1 (ml solvent), which was filtered through a filter to remove insoluble matter, and used as a measurement sample. Based on the obtained elution curve, the number average molecular weight (Mn) was calculated in terms of polymethyl methacrylate (PMMA).
(2) Apatite content (parts by mass / 100 parts by mass thermoplastic resin)
The resin composition is dried at 100 ± 20 ° C. for 8 hours and cooled. 1 g of the dried resin composition was taken in a platinum dish and ashed in an electric furnace at 650 ± 20 ° C., cooled, weighed, and quantified apatite content.

(3) The molar ratio of the raw material, apatite raw material liquid or apatite between calcium or calcium and a metal other than calcium and phosphorus (Ca / P), (Ca + X) / P
The raw material, apatite raw material liquid or apatite calcium, metals other than calcium and phosphorus were quantified, and the molar ratio was calculated. As an example, a method for quantifying calcium and phosphorus is shown. In the case of metals other than calcium, it was quantified by the characteristic wavelength of the metal used.
(3-1) Quantification of calcium:
A raw material, apatite raw material liquid or 0.5 g of apatite is weighed in a platinum dish and carbonized in a 500 ° C. electric furnace. After cooling, 5 ml of hydrochloric acid and 5 ml of pure water are added and dissolved by boiling on a heater. The mixture was cooled again and pure water was added to make 500 ml. The apparatus was quantified at a wavelength of 317.933 nm by high frequency inductively coupled plasma (ICP) emission analysis using IRIS / IP manufactured by Thermo Jarrel Ash.
(3-2) Determination of phosphorus:
The raw material, apatite raw material liquid or 0.5 g of apatite was weighed, 20 ml of concentrated sulfuric acid was added, and wet decomposition was performed on the heater. After cooling, 5 ml of hydrogen peroxide was added, heated on a heater, and concentrated until the total amount became 2-3 ml. The mixture was cooled again to 500 ml with pure water. The apparatus was quantified at a wavelength of 213.618 (nm) by high frequency inductively coupled plasma (ICP) emission analysis using IRIS / IP manufactured by Thermo Jarrel Ash.

(4) Wide-angle X-ray diffraction Measurement conditions are as follows.
X-ray: Copper Kα
Wave number: 0.1542nm
Tube voltage: 40KV
Tube current: 200 mA
Scanning speed: 4 deg. / Min
Divergent slit: 1 deg.
Scattering slit: 1 deg.
Receiving slit: 0.15mm
(5) Transmission Electron Microscope (TEM) Observation Using the molded product, an ultrathin section having a thickness of about 50 nm was prepared using a Reichert-Nissei cryomicrotome. The transmission electron microscope (TEM) observation was performed by taking a 50,000-times bright field image using HF-2000 manufactured by Hitachi, Ltd., selecting 100 particles arbitrarily, and calculating the average diameter of the apatite. And the average aspect ratio was determined.

(6) Physical properties of resin composition A molded product for evaluating physical properties was prepared using an injection molding machine (Nissei Resin Co., Ltd. PS40E).
(6-1) Flexural modulus (Gpa) and flexural strength (Mpa)
This was performed according to ASTM D790.
(6-2) Tensile strength (Mpa) and tensile elongation (%)
This was performed according to ASTM D638.
(6-3) Izod impact strength with notch (J / m)
This was performed according to ASTM D256.
(6-4) Deflection temperature under load (° C)
This was performed according to ASTM D648.
(6-5) Surface appearance 60 ° gloss was measured according to JIS K7150 using a handy gloss meter IG320 manufactured by Horiba.
(6-6) Linear expansion coefficient Using TMA-7 manufactured by Perkin-Elmer, the linear expansion coefficient was measured at a temperature increase rate of 5.00 ° C./min, and was measured in a temperature range of −23 to 80 ° C.
(6-7) Reworkability The molded product (initial molded product) was pulverized with a pulverizer and molded using the obtained pulverized product. Repeat this operation four more times, measure the tensile strength of the molded product (rework product) finally obtained,
(Tensile strength of reworked product) / (Tensile strength of initial molded product)
The tensile strength retention rate was compared.

Production Example 1 of High Aspect Ratio Acicular Apatite
(Production Example a-1)
300.0 g (1.70 mol) of calcium acetate monohydrate and 186.0 g (1.02 mol) of triethyl phosphate were blended in 1000 ml of distilled water at a temperature of 40 ° C. to obtain a raw material solution. This raw material liquid was a homogeneous solution in which the raw material was dissolved in a solvent. Thereafter, the raw material liquid was put in a 5 L autoclave having a stirrer, and sufficiently substituted with nitrogen while being stirred at 250 rpm, and then heated to 220 ° C. The pressure at this time was 2.5 Mpa. This state was maintained for 4 hours to perform hydrothermal synthesis. Thereafter, the heating was stopped, the system was cooled to room temperature, the stirring device was stopped, and the white suspension was extracted. The obtained white suspension was repeatedly filtered and washed with water a sufficient number of times, and then dried at 80 ° C. to obtain a white powder. The evaluation results are shown in Table 1.
(Production Example a-2)
105.2 g (1.05 mol) of light calcium carbonate having an average particle size of 100 nm was added as 200 ml of distilled water and a dispersant, and 2.5 g of ammonium polyacrylate was added to form a stable suspension. The calcium carbonate suspension and 114.8 g (0.63 mol) of triethyl phosphate were blended in 1800 ml of distilled water under the condition of 40 ° C. to obtain a raw material solution. This raw material liquid was white. The subsequent operations were carried out in the same manner as in Production Example a-1. The evaluation results are shown in Table 1.
(Production Example a-3)
Formulated with 49.8 g (0.498 mol) of calcium carbonate, 54.4 g (0.299 mol) of triethyl phosphate, and 145.6 g (0.996 mol) of adipic acid in 2000 ml of distilled water at a temperature of 40 ° C. or lower. The raw material liquid was used. This raw material liquid was a white suspension. The subsequent operations were carried out in the same manner as in Production Example a-1. The evaluation results are shown in Table 1.

[Example 1]
To 100 parts by mass of polyamide 66 (manufactured by Asahi Kasei Co., Ltd .: Leona (registered trademark) 1300), the acicular apatite (a-1) of Production Example a-1 is mixed so as to be 10 parts by mass. Using an extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.), melt kneading was performed to obtain a resin composition. The evaluation results of the obtained resin composition are shown in Table 2.

[Example 2]
To 100 parts by mass of polyamide 66 (manufactured by Asahi Kasei Co., Ltd .: Leona (registered trademark) 1300), the acicular apatite (a-3) of Production Example a-3 is mixed so as to be 10 parts by mass. Using an extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.), melt kneading was performed to obtain a resin composition. The evaluation results of the obtained resin composition are shown in Table 2.

[Example 3]
To 100 parts by mass of polyamide 66 (manufactured by Asahi Kasei Co., Ltd .: Leona (registered trademark) 1300), acicular apatite (a-1) of Production Example a-1 is mixed to 50 parts by mass, and biaxial Using an extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.), melt kneading was performed to obtain a resin composition. The evaluation results of the obtained resin composition are shown in Table 2.

[Example 4]
To 100 parts by mass of polyamide 66 (manufactured by Asahi Kasei Co., Ltd .: Leona (registered trademark) 1300), the acicular apatite (a-1) of Production Example a-1 is mixed so as to be 100 parts by mass. Using an extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.), melt kneading was performed to obtain a resin composition. The evaluation results of the obtained resin composition are shown in Table 2.

[Comparative Example 1]
Polyamide 66 (manufactured by Asahi Kasei Corporation: Leona (registered trademark) 1300) used in Examples 1 to 4 was evaluated. The evaluation results are shown in Table 2.
[Comparative Example 2]
Polyamide 66 (Asahi Kasei Co., Ltd .: Leona (registered trademark) 1300) 100 parts by mass, Taihei Chemical Industrial Co., Ltd. hydroxyapatite HAP-200 (average diameter 0.4 microns, average length 2 microns hexagonal prism shape) Crystal) was mixed so as to be 10 parts by mass, and melt-kneaded using a twin screw extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.) to obtain a resin composition. The evaluation results of the obtained resin composition are shown in Table 2.

[Example 5]
To 100 parts by mass of polyamide 6 (manufactured by Ube Industries, Ltd .: SF1013A), the needle-shaped apatite (a-1) of Production Example a-1 is mixed to 10 parts by mass, and a twin-screw extruder (Toshiba) Using a TEM 35) manufactured by Kikai Co., Ltd., melt kneading was performed to obtain a resin composition. Table 3 shows the evaluation results of the obtained resin composition.

[Example 6]
Production of Polyamide 612 20 Kg and 20 Kg of pure water from an equimolar solid salt of hexamethylenediamine and dodecanoic acid were charged into a 70 L autoclave and stirred well. After sufficiently replacing with nitrogen, the temperature was raised from room temperature to 220 ° C. At this time, the pressure in the autoclave was 18 kg / cm ² in terms of gauge pressure, but heating was continued for 1 hour while removing water from the system so that the pressure did not exceed 18 kg / cm ² . After that, when the internal temperature reaches 270 ° C, the pressure is reduced to atmospheric pressure over 1 hour while removing water out of the system, then the heating is stopped, the polymer is discharged in a strand form from the lower nozzle, water cooling and cutting To obtain polyamide 612. The ηr as determined by the sulfuric acid dissolution relative viscosity method was 2.15.
To the polyamide 612, 100 parts by mass, the needle-shaped apatite (a-1) of Production Example a-1 is mixed so as to be 10 parts by mass, and a twin-screw extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.) is used. And kneaded to obtain a resin composition. Table 3 shows the evaluation results of the obtained resin composition.

[Example 7]
Preparation of polyamide 66 / polyamide 6I 10.5 kg of equimolar salt of hexamethylene diamine and adipic acid, 4.5 kg of equimolar salt of hexamethylene diamine and isophthalic acid, and 20 kg of pure water were placed in a 70 L autoclave and stirred well. Subsequent operations were performed in the same manner as in the method for producing polyamide described in Example 13, and polyamide 66 / polyamide 6I was obtained. The number average molecular weight by GPC was 10,500.
With respect to 100 parts by mass of the above polyamide 66 / polyamide 6I, the needle-shaped apatite (a-1) of Production Example a-1 is mixed so as to be 10 parts by mass, and a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd.). The resin composition was obtained by melt-kneading using TEM35). Table 3 shows the evaluation results of the obtained resin composition.

[Example 8]
Preparation of polyamide 66 / polyamide 6 An equimolar salt of hexamethylenediamine and adipic acid 12 kg, 1.2 kg of ε-caprolactam and 20 kg of pure water were charged into a 70 L autoclave and stirred well. Subsequent operations were carried out in the same manner as in the polyamide production method described in Example 13 to obtain polyamide 66 / polyamide 6. The number average molecular weight by GPC was 13000.
The needle-shaped apatite (a-1) of Production Example a-1 is mixed to 10 parts by mass with respect to 100 parts by mass of the polyamide 66 / polyamide 6, and a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd.). The resin composition was obtained by melt-kneading using TEM35). Table 3 shows the evaluation results of the obtained resin composition.

[Example 9]
Preparation of polyamide 66 / polyamide 6 / polyamide 6I 12 kg of equimolar salt of hexamethylene diamine and adipic acid and 0.75 kg of ε-caprolactam, 2.25 kg of equimolar salt of hexamethylene diamine and isophthalic acid and 70 kg of pure water 20 kg The mixture was charged into an autoclave and stirred well. Subsequent operations were carried out in the same manner as in the method for producing polyamide described in Example 13 to obtain polyamide 66 / polyamide 6 / polyamide 6I. The number average molecular weight by GPC was 12,500.
To the above-mentioned polyamide 66 / polyamide 6 / polyamide 6I, 100 parts by mass, the acicular apatite (a-1) of Production Example a-1 is mixed so as to be 10 parts by mass, and a twin-screw extruder (Toshiba Machine ( Using TEM35), a resin composition was obtained. Table 3 shows the evaluation results of the obtained resin composition.

[Comparative Example 3]
Polyamide 6 (Ube Industries, Ltd. product: SF1013A) used in Example 5 was evaluated. The evaluation results are shown in Table 3.
[Comparative Example 4]
The polyamide 612 synthesized in Example 6 was evaluated. The evaluation results are shown in Table 3.
[Comparative Example 5]
The polyamide 66 / polyamide 6I synthesized in Example 7 was evaluated. The evaluation results are shown in Table 3.
[Comparative Example 6]
The polyamide 66 / polyamide 6 synthesized in Example 8 was evaluated. The evaluation results are shown in Table 3.
[Comparative Example 7]
The polyamide 66 / polyamide 6 / polyamide 6I synthesized in Example 9 was evaluated. The evaluation results are shown in Table 3.

[Example 10]
To 100 parts by mass of polyphenylene ether (manufactured by Asahi Kasei Co., Ltd .: Zylon (registered trademark) 500H), acicular apatite (a-1) of Production Example a-1 is mixed so as to be 10 parts by mass. Using an extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.), melt kneading was performed to obtain a resin composition. Table 4 shows the evaluation results of the obtained resin composition.

[Example 11]
To 100 parts by mass of polyoxymethylene (manufactured by Asahi Kasei Co., Ltd .: Tenac (registered trademark) C4520), acicular apatite (a-1) of Production Example a-1 is mixed so as to be 10 parts by mass. Using a shaft extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.), melt kneading was performed to obtain a resin composition. The evaluation results are shown in Table 4.

[Example 12]
To 100 parts by mass of polybutylene terephthalate (Toray Industries, Inc .: Torecon (registered trademark) 1401-X34), the acicular apatite (a-1) of Production Example a-1 is mixed so as to be 10 parts by mass. The resin composition was obtained by melt-kneading using a twin-screw extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.). Table 4 shows the evaluation results of the obtained resin composition.

[Example 13]
To 100 parts by mass of an aromatic polycarbonate (Mitsubishi Chemical Corporation: Iupilon (registered trademark) S2000), the acicular apatite (a-1) of Production Example a-1 is mixed to 10 parts by mass, Using a twin screw extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.), melt kneading was performed to obtain a resin composition. Table 4 shows the evaluation results of the obtained resin composition.
[Example 14]
To 100 parts by mass of polyphenylene sulfide (manufactured by Toray Industries, Inc .: Ryton (registered trademark) M2588), acicular apatite (a-1) of Production Example a-1 is mixed so as to be 10 parts by mass, and biaxial Using an extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.), melt kneading was performed to obtain a resin composition. Table 4 shows the evaluation results of the obtained resin composition.
[Example 15]
The needle-shaped apatite (a-1) of Production Example a-1 is mixed at 10 parts by mass with 100 parts by mass of polypropylene (Montel SDK Sunrise Co., Ltd .: PM671A), and biaxial extrusion is performed. A resin composition was obtained by melting and kneading using a machine (TEM35 manufactured by Toshiba Machine Co., Ltd.). Table 4 shows the evaluation results of the obtained resin composition.

[Example 16]
The acicular apatite (a-1) of Production Example a-1 is mixed to 100 parts by mass with respect to 100 parts by mass of polystyrene (HIPS: Stylon (registered trademark) 470A manufactured by M & A Styrene Co., Ltd.). Using a shaft extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.), melt kneading was performed to obtain a resin composition. Table 4 shows the evaluation results of the obtained resin composition.

[Example 17]
To 100 parts by mass of methacrylic resin (manufactured by Asahi Kasei Co., Ltd .: Delpet (registered trademark) SR6500), acicular apatite (a-1) of Production Example a-1 is mixed so as to be 10 parts by mass. Using a shaft extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.), melt kneading was performed to obtain a resin composition. Table 4 shows the evaluation results of the obtained resin composition.

[Comparative Example 8]
The polyphenylene ether used in Example 10 was evaluated. The evaluation results of this resin are shown in Table 5.
[Comparative Example 9]
The polyoxymethylene used in Example 11 was evaluated. The evaluation results of this resin are shown in Table 5.
[Comparative Example 10]
The polybutylene terephthalate used in Example 12 was evaluated. The evaluation results of this resin are shown in Table 5.
[Comparative Example 11]
The aromatic polycarbonate used in Example 13 was evaluated. The evaluation results of this resin are shown in Table 5.
[Comparative Example 12]
The polyphenylene sulfide used in Example 14 was evaluated. The evaluation results of this resin are shown in Table 5.
[Comparative Example 13]
The polypropylene used in Example 15 was evaluated. The evaluation results of this resin are shown in Table 5.
[Comparative Example 14]
The polystyrene used in Example 16 was evaluated. The evaluation results of this resin are shown in Table 5.
[Comparative Example 15]
The methacrylic resin used in Example 17 was evaluated. The evaluation results of this resin are shown in Table 5.

[Example 18]
65.0 g of acicular apatite obtained in Production Example a-1 suspended in 1.5 kg of equimolar solid salt of adipic acid and hexamethylenediamine, 1.5 kg of pure water and 200 g of pure water was placed in a 5 L autoclave. Stir well. After sufficiently replacing with nitrogen, the temperature was raised from room temperature to 220 ° C. At this time, the pressure in the autoclave was 18 kg / cm ² in terms of gauge pressure, but heating was continued for 1 hour while removing water from the system so that the pressure did not exceed 18 kg / cm ² . Thereafter, when the internal temperature reached 270 ° C., the pressure was reduced to atmospheric pressure over 1 hour while removing water out of the system, then the heating was stopped, the system was sealed, and then cooled to room temperature. The autoclave was opened, about 1.5 kg of polymer was taken out, and pulverized by a pulverizer. The polyamide resin composition thus obtained was evaluated as a pulverized product and an injection molded product. The evaluation results are shown in Table 6.

[Example 19]
65.0 g of acicular apatite obtained in Production Example a-3 suspended in 1.5 kg of equimolar solid salt of adipic acid and hexamethylenediamine, 1.5 kg of pure water and 200 g of pure water was placed in a 5 L autoclave. Stir well. Subsequent operations were performed in the same manner as in Example 29. The evaluation results are shown in Table 6.

[Example 20]
In the present Example, the synthesis | combination of the acicular apatite by the manufacturing method a-3, and the superposition | polymerization of polyamide were performed continuously following it.
First, two 5L autoclaves with a stirrer are placed one above the other, and the bottom of the autoclave (a) located above and the top of the autoclave (b) located below are connected by piping, and a valve is connected to the piping. Performed using the attached device.
First, in an autoclave (a), 49.8 g (0.498 mol) of calcium carbonate, 54.4 g (0.299 mol) of triethyl phosphate, and 145.6 g (0.996 mol) of adipic acid were added to 2000 ml of distilled water. It mix | blended on the temperature conditions of 23 degreeC, and was set as the apatite raw material liquid. Then, after sufficiently replacing with nitrogen while stirring at 250 rpm, the temperature was raised to 220 ° C. in a sealed state. The pressure at this time was 2.5 MPa. This state was maintained for 4 hours. Thus, the same slurry containing acicular apatite as in production method a-3 was prepared.
On the other hand, in the autoclave (b), 115.7 g (0.996 mol) of hexamethylenediamine and 869 g of hexamethylenediamine / adipic acid equimolar solid salt as a polyamide raw material are dissolved in 869 ml of distilled water at 50 ° C. The aqueous solution prepared was charged, sufficiently replaced with nitrogen, pressurized to 1.8 Mpa with pressurized nitrogen, and held in a state of being stirred at 250 rpm.
After completion of the hydrothermal synthesis of acicular apatite in the autoclave (a), the stirring of the autoclave (a) is stopped, the valve connected to the autoclave (b) is slowly opened, and the suspension in the autoclave (a) is suspended. The suspension was sent to the autoclave (b). The internal temperature of the autoclave (b) after feeding was 150 ° C. The pressure in the autoclave (b) was reduced to 1.8 MPa by using the gauge pressure, and then the temperature was raised to 270 ° C. At this time, heating was continued for 1 hour while water was removed from the system so that the pressure in the autoclave (b) did not exceed 1.8 Mpa as a gauge pressure. Thereafter, the pressure was lowered to atmospheric pressure over a period of about 1 hour, and the polymer was taken out from the bottom nozzle of the autoclave (b) in the form of strands, cooled with water and cut to obtain pellets. The obtained pellets were dried in a nitrogen stream at 80 ° C. for 24 hours and then molded to obtain a molded product. Table 6 shows the physical property measurement results of the obtained molded product.

[Comparative Example 16]
Hydropyroapatite HAP-200 (average diameter 0.4 micron, average diameter) suspended in 1.5 kg of equimolar solid salt of adipic acid and hexamethylenediamine, 1.5 kg of pure water and 200 g of pure water 65.0 g of hexagonal columnar crystals having a length of 2 microns was charged in a 5 L autoclave and stirred well. Subsequent operations were performed in the same manner as in Example 20. The evaluation results are shown in Table 6.

[Example 21]
10 parts by mass of acicular apatite obtained in Production Example a-1 and short glass fibers (Asahi Fiber Glass Co., Ltd .: JA416) with respect to 100 parts by mass of polyamide 66 (Asahi Kasei Co., Ltd .: Leona (registered trademark) 1300) 15 parts by mass was melt-kneaded at a cylinder temperature of 290 ° C., a rotation speed of 250 rpm, and a rate of 40 kg / h using a twin screw extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.) to obtain a resin composition. In addition, the acicular apatite and the short glass fiber were supplied from the side feeder. Table 7 shows the evaluation results of the obtained resin composition.

[Example 22]
10 parts by mass of acicular apatite obtained in Production Example a-1 and maleic anhydride-modified rubber component (manufactured by Asahi Kasei Corporation: 100 parts by mass of polyamide 66 (Asahi Kasei Co., Ltd .: Leona (registered trademark) 1300): 25 parts by mass of Tuftec (registered trademark) M1943) was melt-kneaded using a twin screw extruder (TEM35 manufactured by Toshiba Machine Co., Ltd.) at a cylinder temperature of 290 ° C., a rotation speed of 250 rpm, and a rate of 40 kg / h to obtain a resin composition. It was. The acicular apatite and rubber components were introduced from the side feeder. Table 7 shows the evaluation results of the obtained resin composition.

[Comparative Example 17]
Polyamide 66 (Asahi Kasei Co., Ltd .: Leona (registered trademark) 1300) 100 parts by mass of glass short fiber (Asahi Fiber Glass Co., Ltd .: JA416) 15 parts by mass of twin screw extruder (Toshiba Machine Co., Ltd.) Using a TEM 35), a resin composition was obtained by melt-kneading at a cylinder temperature of 290 ° C., a rotation speed of 250 rpm, and a rate of 40 kg / h. In addition, the short glass fiber was supplied from the side feeder. Table 7 shows the evaluation results of the obtained resin composition.

[Comparative Example 18]
25 parts by mass of maleic anhydride modified rubber component (Asahi Kasei Co., Ltd .: Tuftec (registered trademark) M1943) is added to 100 parts by mass of polyamide 66 (Asahi Kasei Co., Ltd .: Leona (registered trademark) 1300). (Toshiki Machine Co., Ltd. TEM35) was used for melt kneading at a cylinder temperature of 290 ° C., a rotational speed of 250 rpm, and a rate of 40 kg / h to obtain a resin composition. The rubber component was introduced from the side feeder. Table 7 shows the evaluation results of the obtained resin composition.
Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

  The molded product obtained from the resin composition of the present invention has high strength, rigidity, heat resistance, excellent toughness, and excellent weld strength retention, dimensional characteristics, surface appearance, and reworkability. Application to various parts, etc. in the field of industrial consumption, automobile field, electrical / electronic field, machine / industrial field, office equipment field, aviation / space field, etc. is expected.

Claims (14)

  A resin composition comprising a resin and acicular apatite, wherein the molar ratio of calcium (Ca) and metal (X) other than calcium and calcium (Ca) constituting the apatite present in the obtained resin composition Ca / (Ca + X) is 0.70 to 1.00, the average diameter is 100 nm or less, and the average aspect ratio (L / d) is the ratio of the average diameter (d) to the average length (L) ) Is present in the resin composition in a particle shape of 5 or more.   2. The resin composition according to claim 1, wherein an average aspect ratio (L / d), which is a ratio of an average diameter (d) to an average length (L), is present in the resin composition in a particle shape of 15 or more. Acicular apatite reinforced resin composition.   The molar ratio Ca / (Ca + X) of calcium (Ca) and metal (X) other than calcium and calcium (Ca) constituting the acicular apatite is 0.75 to 0.98, or 2. The acicular apatite reinforced resin composition according to 2.   The molar ratio Ca / (Ca + X) of calcium (Ca) constituting the acicular apatite and the metal (X) other than calcium to calcium (Ca) is 0.80 to 0.95, or 2. The acicular apatite reinforced resin composition according to 2.   The resin is selected from polyamide resin, polyphenylene ether resin, polyoxymethylene resin, aliphatic polyester resin, aromatic polyester resin, aromatic polycarbonate resin, polyphenylene sulfide resin, polyolefin resin, styrene resin, acrylic resin, and rubber. The acicular apatite reinforced resin composition according to any one of claims 1 to 4, wherein the composition is at least one thermoplastic resin.   2. The molar ratio (Ca + X) / P of phosphorus (P) constituting acicular apatite to calcium (Ca) and metal (X) other than calcium is 1.20 to 1.80. To 4. The acicular apatite reinforced resin composition according to any one of items 1 to 4.   Acicular apatite contains (A) a calcium compound having a molar ratio of phosphorus to calcium (P / Ca) of 0.1 or less, and (B) an ester compound of phosphoric acid or phosphorous acid. (C) water or hydrophilic It is obtained by mixing a solvent consisting of at least one selected from organic solvents into a raw material liquid, and hydrothermally synthesizing the raw material liquid at 120 ° C. or higher and under pressure. Item 2. The acicular apatite reinforced resin composition according to Item 1.   The molar ratio Ca / (Ca + X) of the resin, calcium (Ca) and metal (X) other than calcium and calcium (Ca) is 0.70 to 1.00, and the average diameter (d) is 100 nm or less, And a resin obtained by blending acicular apatite having an average aspect ratio (L / d) of 5 or more, which is a ratio of the average diameter (d) and the average length (L), and The manufacturing method of the acicular apatite reinforcement | strengthening resin composition which consists of acicular apatite.   The molar ratio Ca / (Ca + X) of the resin raw material, calcium (Ca) and the metal (X) other than calcium and calcium (Ca) is 0.70 to 1.00, and the average diameter (d) is 100 nm or less. And acicular apatite having an average aspect ratio (L / d) of 5 or more, which is a ratio of the average diameter (d) to the average length (L), is obtained by polymerization. A method for producing a needle-like apatite-reinforced resin composition comprising a resin and needle-like apatite.   The molar ratio Ca / (Ca + X) between calcium (Ca) and the metal (X) other than calcium and calcium (Ca) constituting the acicular apatite is 0.75 to 0.98, or A method for producing the acicular apatite reinforced resin composition according to claim 9.   The molar ratio Ca / (Ca + X) of calcium (Ca) and the metal (X) other than calcium and calcium (Ca) constituting the acicular apatite is 0.80 to 0.95, or A method for producing the acicular apatite reinforced resin composition according to claim 9.   The apatite to be blended includes (A) a calcium compound having a molar ratio of phosphorus to calcium (P / Ca) of 0.1 or less and (B) an ester compound of phosphoric acid or phosphorous acid, and (C) water or hydrophilicity. It is obtained by mixing a solvent consisting of at least one selected from organic solvents into a raw material liquid, and hydrothermally synthesizing the raw material liquid at 120 ° C. or higher and under pressure. Item 12. The method for producing the acicular apatite reinforced resin composition according to any one of Items 8 to 11.   A resin, (A) a calcium compound having a phosphorus to calcium molar ratio (P / Ca) of 0.1 or less, and (B) an ester compound of phosphoric acid or phosphorous acid in (C) water or a hydrophilic organic solvent. 10. The apatite-reinforced resin according to claim 8, wherein the apatite-reinforced resin is obtained by mixing a raw material liquid mixed with at least one solvent selected from the above and heat-treating the resin in a molten state. A method for producing the composition.   (C) Water or a hydrophilic organic solvent containing a resin raw material, (A) a calcium compound having a molar ratio of phosphorus to calcium (P / Ca) of 0.1 or less, and (B) an ester compound of phosphoric acid or phosphorous acid 10. The method according to claim 8, wherein the raw material liquid is mixed with a raw material liquid mixed with at least one solvent selected from the above, and the polymerization of the resin and the hydrothermal synthesis of apatite are performed simultaneously. Of producing a needle-shaped apatite-reinforced resin composition.