JP2011144318A - Polylactic acid resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin material preventing a liberation of an isocyanate group-containing compound, having an advantageous working environment and an excellent hydrolysis resistance, and applying a small amount of burden on the environment. <P>SOLUTION: The composition comprises: 100 pts.wt. of polylactic acid (component A); 0.001 to 10 pts.wt. of a compound (component B) containing a cyclic structure in which a primary nitrogen atom and secondary nitrogen atom of one carbodiimide group are bonded to each other through a bonding group and the number of atoms forming the cyclic structure is 8 to 50; and 0.001 to 2 pts.wt. of at least one type of antioxidant (component C) selected from the group consisting of a phosphite-based compound, a phosphonite-based compound, a hindered phenol-based compound, and a thioether-based compound. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a polylactic acid resin composition having improved working environment as well as hydrolysis resistance by blending a cyclic carbodiimide compound and a stabilizer.

  In recent years, due to concerns about the depletion of petroleum resources and the problem of increased carbon dioxide in the air that causes global warming, biomass resources that do not depend on petroleum as a raw material and that do not increase carbon dioxide even when burned are formed. In the polymer field, biomass plastics produced from biomass resources are actively developed. In particular, polylactic acid resin has relatively high heat resistance and mechanical properties among biomass plastics, so its application is expanding to tableware, packaging materials, general merchandise, etc. It has become like this.

  However, due to its low hydrolysis resistance, polylactic acid has not been developed to industrial materials such as electric / electronic parts, automobile parts, etc. in which PC, PBT, PET and the like typified by engineering plastics are used.

  In Patent Document 1, an end-blocking agent is added to polylactic acid, and at least a part of the carboxyl group ends of polylactic acid is blocked to suppress a decrease in strength due to hot water treatment. , Its level of hydrolysis resistance is insufficient.

  Patent Document 2 discloses a technique for improving hydrolysis resistance by blending a stabilizer such as a carbodiimide compound and an antioxidant with respect to a polylactic acid resin, which is shown here. Carbodiimide is not a cyclic carbodiimide. For this reason, with the reaction in which the carbodiimide compound is bonded to the terminal of the polyester, the compound having an isocyanate group is liberated, a unique odor of the isocyanate compound is generated, and the working environment is deteriorated.

JP 2002-30208 A JP 2005-53870 A

  By adding a cyclic carbodiimide compound having a carbodiimide group in the cyclic structure and an antioxidant to a polylactic acid resin with a low environmental load, the release of the compound having an isocyanate group is prevented, the working environment is good, and the water resistance is high. The present inventors have found that a resin material excellent in decomposability can be obtained and completed the present invention.

  That is, for 100 parts by weight of (A) polylactic acid (component A), (B) including a cyclic structure in which one carbodiimide group is bonded to the first nitrogen and the second nitrogen by a bonding group, It consists of 0.001 to 10 parts by weight of a compound having 8 to 50 atoms forming a cyclic structure (component B) and (C) a phosphite compound, a phosphonite compound, a hindered phenol compound and a thioether compound. A composition containing 0.001 to 2 parts by weight of at least one antioxidant (C component) selected from the group is provided. Furthermore, with respect to 100 parts by weight of polylactic acid (component A), (D) at least one end-blocking agent (component D) selected from the group consisting of an epoxy compound, an oxazoline compound and an oxazine compound (0.001 to 10 parts by weight) It is preferable that 0.01 to 0.3 part by weight of (E) hydrotalcite (E component) is included with respect to 100 parts by weight of polylactic acid (A component).

  The present invention prevents the liberation of a compound having an isocyanate group by adding a cyclic carbodiimide compound having a carbodiimide group in the cyclic structure and an antioxidant to a polylactic acid resin having a small environmental load, and the working environment is good. Therefore, a resin material having excellent hydrolysis resistance and low environmental impact is provided.

  Hereinafter, each component in the resin composition of the present invention, a blending ratio thereof, a preparation method, and the like will be specifically described sequentially.

<About component A>
As the polylactic acid resin used as the component A of the present invention, any of poly-L lactic acid mainly composed of L-lactic acid units, poly-D lactic acid mainly composed of D-lactic acid units, or a mixture thereof may be used.

The poly-L lactic acid resin (component A-1) and the poly-D lactic acid resin (component A-2) of the present invention substantially consist of an L-lactic acid unit or a D-lactic acid unit represented by the formula (1). .

  The optical purity of the poly-L lactic acid resin or poly-D lactic acid resin used in the present invention is preferably 90 to 100 mol%. If the optical purity is lower than this, the crystallinity and melting point of polylactic acid are lowered, and it is difficult to obtain high heat resistance. For this reason, the melting point of the poly-L lactic acid resin or the poly-D lactic acid resin is preferably 160 ° C. or higher, more preferably 170 ° C. or higher, and most preferably 175 ° C. or higher. In this respect, the optical purity of lactic acid and lactide of the polymer raw material is preferably 96 to 100 mol%, more preferably 97.5 to 100 mol%, still more preferably 98.5 to 100 mol%, and particularly preferably 99 to 100 mol%. A range of 100 mol% is selected.

  Examples of the copolymer unit include a D-lactic acid unit in the case of a poly-L lactic acid resin, an L-lactic acid unit in the case of a poly-D lactic acid resin, and units other than the lactic acid unit. The copolymerization ratio of copolymer units other than lactic acid units is preferably 10 mol% or less, more preferably 5 mol% or less, still more preferably 2 mol% or less, and most preferably 1 mol% or less.

  As copolymerized units, units derived from dicarboxylic acids, polyhydric alcohols, hydroxycarboxylic acids, lactones and the like having functional groups capable of forming two or more ester bonds, various polyesters composed of these various constituents, various polyethers, Examples are derived from various polycarbonates and the like.

  Examples of the dicarboxylic acid include succinic acid, adipic acid, azelaic acid, sebacic acid, terephthalic acid, and isophthalic acid. Polyhydric alcohols include ethylene glycol, 1,3-propanediol, propylene glycol, butanediol, pentanediol, hexanediol, octanediol, glycerin, sorbitan, neopentyl glycol, diethylene glycol, triethylene glycol, polyethylene glycol, polytrimethylene Examples thereof include aliphatic polyhydric alcohols such as glycol and polypropylene glycol, and aromatic polyhydric alcohols obtained by adding ethylene oxide to bisphenol. Examples of the hydroxycarboxylic acid include glycolic acid and hydroxybutyric acid. Examples of the lactone include glycolide, ε-caprolactone, β-propiolactone, δ-butyrolactone, β- or γ-butyrolactone, pivalolactone, and δ-valerolactone.

  The weight average molecular weight of the poly L-lactic acid resin and the poly D-lactic acid resin is preferably 80,000 to 300,000, more preferably 100,000 to 250,000, in order to make the mechanical properties and moldability of the composition of the present invention compatible. Preferably, a range of 120,000 to 230,000 is selected.

Poly L-lactic acid resin and poly D-lactic acid resin can be produced by a conventionally known method, for example, melt ring-opening polymerization method of L-lactide or D-lactide, solid-phase polymerization method of low molecular weight polylactic acid Furthermore, a direct polymerization method in which lactic acid is dehydrated and condensed can be exemplified. The polymerization reaction can be carried out in a conventionally known reaction apparatus. For example, a vertical reactor or a horizontal reactor equipped with a high-viscosity stirring blade such as a helical ribbon blade can be used alone or in parallel. Moreover, any of a batch type, a continuous type, a semibatch type may be sufficient, and these may be combined. In the solid-state polymerization method, it is preferable to crystallize the prepolymer in advance from the viewpoint of preventing fusion of pellets and production efficiency, and the container itself rotates like a fixed vertical or horizontal reaction vessel, or a tumbler or kiln. In a reaction vessel (such as a rotary kiln), the polymerization is carried out at a constant temperature in the temperature range from the glass transition temperature of the prepolymer to less than the melting point, or gradually with the progress of the polymerization. For the purpose of efficiently removing generated water, a method of reducing the pressure inside the reaction vessels or circulating a heated inert gas stream is also preferably used. For melt ring-opening polymerization of lactide, it is preferable to apply a metal-containing catalyst from the viewpoint of production efficiency and polymer quality. From the viewpoint of catalytic activity and side reaction, a catalyst containing tin, preferably a II-valent catalyst, is preferable. Tin compounds, specifically diethoxytin, dinonyloxytin, tin myristate, tin octylate, tin stearate and the like, among others, tin octylate is exemplified as a particularly preferable agent whose safety has been confirmed by FDA. The amount of the catalyst used is preferably 0.1 × 10 ⁻⁴ to 50 × 10 ⁻⁴ mol per kg of lactide, and further considering the reactivity, color tone and stability of the resulting polylactide, 1 × 10 ⁻⁴ to 30 × 10 ⁻⁴ mol is more preferable, and 2 × 10 ⁻⁴ to 15 × 10 ⁻⁴ mol is particularly preferable. Alcohol may be used as a polymerization initiator. Such alcohol is preferably non-volatile without inhibiting the polymerization of polylactic acid. For example, decanol, dodecanol, tetradecanol, hexadecanol, octadecanol and the like can be suitably used. The metal-containing catalyst used at the time of polymerization is preferably deactivated with a conventionally known deactivator prior to use. The deactivator is not particularly limited as long as it is a deactivator generally used as a deactivator for a polymerization catalyst of a polyester resin, but a phosphono fatty acid ester represented by the following general formula (2) is preferable.

In the formula, R _{11 to} R ₁₃ are each independently an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 12 carbon atoms. Examples of the alkenyl group include an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group. Examples of the aryl group include a phenyl group and a naphthalenyl group. R _{11 to} R ₁₃ may be the same or different from each other. N ³¹ is an integer of 1 to 3. As the compound represented by the formula (2), ethyl diethylphosphonoacetate, ethyl di-n-propylphosphonoacetate, ethyl di-n-butylphosphonoacetate, ethyl di-n-hexylphosphonoacetate, di-n-octyl Ethyl phosphonoacetate, ethyl di-n-decylphosphonoacetate, ethyl di-n-dodecylphosphonoacetate, ethyl di-n-octadecylphosphonoacetate, ethyl diphenylphosphonoacetate, decyl diethylphosphonoacetate, dodecyl diethylphosphonoacetate , Octadecyl diethylphosphonoacetate, ethyl diethylphosphonopropionate, ethyl di-n-propylphosphonopropionate, ethyl di-n-butylphosphonopropionate, ethyl di-n-hexylphosphonopropionate, di-n -Ethyl octylphosphonopropionate, di-n-decylphosphono Ethyl lopionate, ethyl di-n-dodecylphosphonopropionate, ethyl di-n-octadecylphosphonopropionate, ethyl diphenylphosphonopropionate, decyl diethylphosphonopropionate, dodecyl diethylphosphonopropionate, diethylphosphono Octadecyl propionate, ethyl diethylphosphonobutyrate, ethyl di-n-propylphosphonobutyrate, ethyl di-n-butylphosphonobutyrate, ethyl di-n-hexylphosphonobutyrate, ethyl di-n-octylphosphonobutyrate, di- Ethyl n-decylphosphonobutyrate, ethyl di-n-dodecylphosphonobutyrate, ethyl di-n-octadecylphosphonobutyrate, ethyl diphenylphosphonobutyrate, decyl diethylphosphonobutyrate, dodecyl diethylphosphonobutyrate, octadecyl diethylphosphonobutyrate And the like. In view of efficacy and ease of handling, ethyl diethylphosphonoacetate, ethyl di-n-propylphosphonoacetate, ethyl di-n-butylphosphonoacetate, ethyl di-n-hexylphosphonoacetate, decyl diethylphosphonoacetate, Diethylphosphonoacetic acid octadecyl is preferred. In the formula (2), when the carbon number of R _{11 to} R ₁₃ is 20 or less, the melting point thereof is lower than the production temperature of polylactic acid or the composition, so that the mixture is sufficiently melt-mixed, and the metal polymerization catalyst is efficiently used. Can be supplemented. The phosphono fatty acid ester has an aliphatic hydrocarbon group between the phosphonic acid diester moiety and the carboxylic acid ester moiety. If n ³¹ is an integer of 1 to 3, it is possible to effectively supplement the metal polymerization catalyst of polylactic acid.

  The content of the phosphono fatty acid ester is preferably 0.001 to 0.5 parts by weight, more preferably 0.02 to 0.2 parts by weight with respect to 100 parts by weight of polylactic acid. If the content of the phosphono fatty acid ester is too small, the deactivation efficiency of the remaining metal polymerization catalyst is extremely poor, and a sufficient effect cannot be obtained. On the other hand, when the amount is too large, contamination of the mold used at the time of molding processing becomes significant. The polymerization deactivator is preferably added at the end of the polymerization, but can be optionally added in each process of extrusion and molding as necessary.

  When a mixture of poly L-lactic acid resin (component A-1) and poly D-lactic acid resin (component A-2) is used, the weight ratio (component A-1 / component A-2) is 10:90 to 90: It is preferable to contain in 10 range. Furthermore, a phosphate ester metal salt represented by the formula (3) and / or (4) is added to a mixture of the poly L-lactic acid resin (A-1 component) and the poly D-lactic acid resin (A-2 component). By including in the range of preferably 0.01 to 2.0 parts by weight per 100 parts by weight in total of the poly L-lactic acid resin (component A-1) and the poly D-lactic acid resin (component A-2), This is preferable because a polylactic acid resin in which stereocomplex crystals are formed can be obtained. If the phosphate metal salt is less than 0.01 parts by weight, there may be no effect on the formation of stereocomplex crystals and improvement in crystallinity. Decomposition of lactic acid component and generation of foreign matter may be caused. From this viewpoint, the application amount of the phosphate ester metal salt is more preferably selected in the range of 0.02 to 1.0 part by weight, and more preferably 0.03 to 1.0 part by weight.

（式中Ｒ_１４は水素原子、または炭素原子数１〜４のアルキル基を、Ｒ_１５、Ｒ_１６、Ｒ_１７はそれぞれ独立に水素原子、または炭素原子数１〜１２のアルキル基を、Ｍ_１はアルカリ金属原子、アルカリ土類金属原子、亜鉛原子またはアルミニウム原子を表し、ｐ³²は１または２を、ｑ³²はＭ_１がアルカリ金属原子、アルカリ土類金属原子または亜鉛原子のときは０を、アルミニウム原子のときは１または２を表す。）

(Wherein _{R 14} is a hydrogen atom or an alkyl group having 1 to 4 carbon _atoms, the R _15, R _{16, R 17} each independently represent a hydrogen atom or an alkyl group having 1 to 12 carbon atoms,,, _{M 1} Represents an alkali metal atom, alkaline earth metal atom, zinc atom or aluminum atom, p ³² is 1 or 2, q ³² is 0 when M ₁ is an alkali metal atom, alkaline earth metal atom or zinc atom. In the case of an aluminum atom, 1 or 2 is represented.)

（式中Ｒ_１８、Ｒ_１９はそれぞれ独立に水素原子、または炭素原子数１〜１２のアルキル基を、Ｍ_２はアルカリ金属原子、アルカリ土類金属原子、亜鉛原子またはアルミニウム原子を表し、ｐ^３３は１または２を、ｑ^３３はＭ_２がアルカリ金属原子、アルカリ土類金属原子または亜鉛原子のときは０を、アルミニウム原子のときは１または２を表す。）

(Wherein _{R 18, R 19} each independently represent a hydrogen atom or an alkyl group having 1 to 12 carbon atoms,, _{M 2} represents an alkali metal atom, an alkaline earth metal atom, zinc atom or aluminum ^{atom, p 33} Represents 1 or 2, and q ³³ represents 0 when M ₂ is an alkali metal atom, alkaline earth metal atom or zinc atom, and 1 or 2 when M ₂ is an aluminum atom.

The polylactic acid thus produced becomes a stereocomplex polylactic acid in which a stereocomplex crystal is highly formed, and the melting enthalpy derived from the polylactic acid resin (component A) crystal in the temperature rising process of the differential scanning calorimeter (DSC) measurement is used. The stereocomplex crystallinity represented by the following formula (1) is preferably 80% or more.
Stereo complex crystallinity = ΔHms / (ΔHms + ΔHmh) × 100 (1)
[In the formula (1), ΔHmh and ΔHms are the melting enthalpy (ΔHmh) of the melting point of the crystal, which appears below 190 ° C. in the temperature rising process of the differential scanning calorimeter (DSC), respectively, and 190 ° C. or more and 250 It is the melting enthalpy (ΔHms) of the crystalline melting point that appears below ° C. ]

  The ΔHmh and ΔHms were determined by measuring the resin composition using a differential scanning calorimeter (DSC) in a nitrogen atmosphere at a heating rate of 20 ° C./min.

  The higher the stereocomplex crystallinity, the higher the moldability and heat resistance, and the stereocomplex crystallinity is more preferably 85% or more, and even more preferably 90% or more. When the stereocomplex crystallinity is lower than 80%, the characteristics of the homopolylactic acid crystal derived from the poly-L lactic acid resin or the poly-D lactic acid resin appear, and the heat resistance becomes insufficient.

  The melting point of stereocomplex polylactic acid is preferably 200 ° C. or higher, more preferably 205 ° C. or higher, and still more preferably 210 ° C. or higher. If the melting point of stereocomplex polylactic acid is lower than 200 ° C., the heat resistance is insufficient due to its crystallinity and low melting point.

The melting enthalpy is preferably 20 J / g or more, more preferably 30 J / g or more. When the melting enthalpy is lower than 20 J / g, the crystallinity is low and the heat resistance is insufficient.
Specifically, it is preferable that the stereocomplex crystallinity is 80% or more, the melting point is 200 ° C. or more, and the melting enthalpy is 20 J / g or more.

<About B component>
In the present invention, the cyclic carbodiimide compound (component B) has a cyclic structure. The cyclic carbodiimide compound may have a plurality of cyclic structures.
The cyclic structure has one carbodiimide group (—N═C═N—), and the first nitrogen and the second nitrogen are bonded by a bonding group. One cyclic structure has only one carbodiimide group. The number of atoms in the cyclic structure is 8 to 50, preferably 10 to 30, more preferably 10 to 20, and most preferably 10 to 15.

  Here, the number of atoms in the ring structure means the number of atoms that directly constitute the ring structure, and is, for example, 8 for an 8-membered ring and 50 for a 50-membered ring. This is because if the number of atoms in the cyclic structure is smaller than 8, the stability of the cyclic carbodiimide compound is lowered, and it may be difficult to store and use. From the standpoint of reactivity, there is no particular limitation on the upper limit of the number of ring members, but cyclic carbodiimide compounds having more than 50 atoms are difficult to synthesize, and the cost may increase significantly. From this viewpoint, the number of atoms in the cyclic structure is preferably 10-30, more preferably 10-20, and most preferably 10-15.

式中、Ｑは、下記式（５−１）、（５−２）または（５−３）で表される２〜４価の結合基である。

式中、Ａｒ^１およびＡｒ^２は各々独立に、それぞれヘテロ原子ならびに置換基を含んでいてもよい、２〜４価の炭素数５〜１５の芳香族基である。 The cyclic structure is a structure represented by the following formula (5).

In the formula, Q is a divalent to tetravalent linking group represented by the following formula (5-1), (5-2), or (5-3).

In the formula, Ar ¹ and Ar ² are each independently a 2- to 4-valent aromatic group having 5 to 15 carbon atoms which may contain a hetero atom and a substituent.

  As an aromatic group, each of which contains a hetero atom and may have a heterocyclic structure, an arylene group having 5 to 15 carbon atoms, an arenetriyl group having 5 to 15 carbon atoms, an arenetetra having 5 to 15 carbon atoms Yl group. Examples of the arylene group (divalent) include a phenylene group and a naphthalenediyl group. Examples of the arenetriyl group (trivalent) include a benzenetriyl group and a naphthalenetriyl group. Examples of the arenetetrayl group (tetravalent) include a benzenetetrayl group and a naphthalenetetrayl group. These aromatic groups may be substituted. Examples of the substituent include an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 15 carbon atoms, a halogen atom, a nitro group, an amide group, a hydroxyl group, an ester group, an ether group, and an aldehyde group.

R ¹ and R ² each independently contain a heteroatom and a substituent, each having 2 to 4 valent aliphatic groups having 1 to 20 carbon atoms and 2 to 4 valent fatty acids having 3 to 20 carbon atoms A cyclic group, and a combination thereof, or a combination of the aliphatic group, the alicyclic group, and a divalent to tetravalent aromatic group having 5 to 15 carbon atoms.

  Examples of the aliphatic group include an alkylene group having 1 to 20 carbon atoms, an alkanetriyl group having 1 to 20 carbon atoms, and an alkanetetrayl group having 1 to 20 carbon atoms. Examples of the alkylene group include a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a heptylene group, an octylene group, a nonylene group, a decylene group, a dodecylene group, and a hexadecylene group. As the alkanetriyl group, methanetriyl group, ethanetriyl group, propanetriyl group, butanetriyl group, pentanetriyl group, hexanetriyl group, heptanetriyl group, octanetriyl group, nonanetriyl group, decantriyl group, dodecantriyl group, Examples include a hexadecantriyl group. As alkanetetrayl group, methanetetrayl group, ethanetetrayl group, propanetetrayl group, butanetetrayl group, pentanetetrayl group, hexanetetrayl group, heptanetetrayl group, octanetetrayl group, nonanetetrayl group Decanetetrayl group, dodecanetetrayl group, hexadecanetetrayl group and the like. These aliphatic groups may be substituted. Examples of the substituent include an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 15 carbon atoms, a halogen atom, a nitro group, an amide group, a hydroxyl group, an ester group, an ether group, and an aldehyde group.

  Examples of the alicyclic group include a cycloalkylene group having 3 to 20 carbon atoms, a cycloalkanetriyl group having 3 to 20 carbon atoms, and a cycloalkanetetrayl group having 3 to 20 carbon atoms. Examples of the cycloalkylene group include a cyclopropylene group, a cyclobutylene group, a cyclopentylene group, a cyclohexylene group, a cycloheptylene group, a cyclooctylene group, a cyclononylene group, a cyclodecylene group, a cyclododecylene group, and a cyclohexadecylene group. As cycloalkanetriyl group, cyclopropanetriyl group, cyclobutanetriyl group, cyclopentanetriyl group, cyclohexanetriyl group, cycloheptanetriyl group, cyclooctanetriyl group, cyclononanetriyl group, cyclodecanetriyl group Group, cyclododecane triyl group, cyclohexadecane triyl group and the like. As cycloalkanetetrayl group, cyclopropanetetrayl group, cyclobutanetetrayl group, cyclopentanetetrayl group, cyclohexanetetrayl group, cycloheptanetetrayl group, cyclooctanetetrayl group, cyclononanetetrayl group, cyclodecanetetrayl group Yl group, cyclododecanetetrayl group, cyclohexadecanetetrayl group and the like. These alicyclic groups may be substituted. Examples of the substituent include an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 15 carbon atoms, a halogen atom, a nitro group, an amide group, a hydroxyl group, an ester group, an ether group, and an aldehyde group.

  As an aromatic group, each of which contains a hetero atom and may have a heterocyclic structure, an arylene group having 5 to 15 carbon atoms, an arenetriyl group having 5 to 15 carbon atoms, an arenetetra having 5 to 15 carbon atoms Yl group. Examples of the arylene group include a phenylene group and a naphthalenediyl group. Examples of the arenetriyl group (trivalent) include a benzenetriyl group and a naphthalenetriyl group. Examples of the arenetetrayl group (tetravalent) include a benzenetetrayl group and a naphthalenetetrayl group. These aromatic groups may be substituted. Examples of the substituent include an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 15 carbon atoms, a halogen atom, a nitro group, an amide group, a hydroxyl group, an ester group, an ether group, and an aldehyde group.

X ¹ and X ² each independently contain a heteroatom and a substituent, each having a 2 to 4 valent aliphatic group having 1 to 20 carbon atoms and a 2 to 4 valent fatty acid having 3 to 20 carbon atoms It is a cyclic group, a divalent to tetravalent aromatic group having 5 to 15 carbon atoms, or a combination thereof.

  Examples of the aliphatic group include an alkylene group having 1 to 20 carbon atoms, an alkanetriyl group having 1 to 20 carbon atoms, and an alkanetetrayl group having 1 to 20 carbon atoms. Examples of the alkylene group include a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a heptylene group, an octylene group, a nonylene group, a decylene group, a dodecylene group, and a hexadecylene group. As the alkanetriyl group, methanetriyl group, ethanetriyl group, propanetriyl group, butanetriyl group, pentanetriyl group, hexanetriyl group, heptanetriyl group, octanetriyl group, nonanetriyl group, decantriyl group, dodecantriyl group, Examples include a hexadecantriyl group. As alkanetetrayl group, methanetetrayl group, ethanetetrayl group, propanetetrayl group, butanetetrayl group, pentanetetrayl group, hexanetetrayl group, heptanetetrayl group, octanetetrayl group, nonanetetrayl group Decanetetrayl group, dodecanetetrayl group, hexadecanetetrayl group and the like. These aliphatic groups may be substituted. Examples of the substituent include an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 15 carbon atoms, a halogen atom, a nitro group, an amide group, a hydroxyl group, an ester group, an ether group, and an aldehyde group.

  Examples of the alicyclic group include a cycloalkylene group having 3 to 20 carbon atoms, a cycloalkanetriyl group having 3 to 20 carbon atoms, and a cycloalkanetetrayl group having 3 to 20 carbon atoms. Examples of the cycloalkylene group include a cyclopropylene group, a cyclobutylene group, a cyclopentylene group, a cyclohexylene group, a cycloheptylene group, a cyclooctylene group, a cyclononylene group, a cyclodecylene group, a cyclododecylene group, and a cyclohexadecylene group. As the alkanetriyl group, cyclopropanetriyl group, cyclobutanetriyl group, cyclopentanetriyl group, cyclohexanetriyl group, cycloheptanetriyl group, cyclooctanetriyl group, cyclononanetriyl group, cyclodecanetriyl group , Cyclododecanetriyl group, cyclohexadecanetriyl group and the like. As the alkanetetrayl group, cyclopropanetetrayl group, cyclobutanetetrayl group, cyclopentanetetrayl group, cyclohexanetetrayl group, cycloheptanetetrayl group, cyclooctanetetrayl group, cyclononanetetrayl group, cyclodecanetetrayl group Group, cyclododecanetetrayl group, cyclohexadecanetetrayl group and the like. These alicyclic groups may be substituted. Examples of the substituent include an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 15 carbon atoms, a halogen atom, a nitro group, an amide group, a hydroxyl group, an ester group, an ether group, and an aldehyde group.

  As an aromatic group, each of which contains a hetero atom and may have a heterocyclic structure, an arylene group having 5 to 15 carbon atoms, an arenetriyl group having 5 to 15 carbon atoms, an arenetetra having 5 to 15 carbon atoms Yl group. Examples of the arylene group include a phenylene group and a naphthalenediyl group. Examples of the arenetriyl group (trivalent) include a benzenetriyl group and a naphthalenetriyl group. Examples of the arenetetrayl group (tetravalent) include a benzenetetrayl group and a naphthalenetetrayl group. These aromatic groups may be substituted. Examples of the substituent include an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 15 carbon atoms, a halogen atom, a nitro group, an amide group, a hydroxyl group, an ester group, an ether group, and an aldehyde group.

In formulas (5-1) and (5-2), s and k are integers of 0 to 10, preferably 0 to 3, more preferably 0 to 1. This is because if s and k exceed 10, the cyclic carbodiimide compound is difficult to synthesize, and the cost may increase significantly. From this viewpoint, the integer is preferably selected in the range of 0 to 3. When s or k is 2 or more, X ¹ or X ² as a repeating unit may be different from other X ¹ or X ² .

X ³ is a divalent to tetravalent C 1-20 aliphatic group, a divalent to tetravalent C 3-20 alicyclic group, each of which may contain a heteroatom and a substituent, A tetravalent aromatic group having 5 to 15 carbon atoms, or a combination thereof.

  Examples of the aliphatic group include an alkylene group having 1 to 20 carbon atoms, an alkanetriyl group having 1 to 20 carbon atoms, and an alkanetetrayl group having 1 to 20 carbon atoms. Examples of the alkylene group include a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a heptylene group, an octylene group, a nonylene group, a decylene group, a dodecylene group, and a hexadecylene group. As the alkanetriyl group, methanetriyl group, ethanetriyl group, propanetriyl group, butanetriyl group, pentanetriyl group, hexanetriyl group, heptanetriyl group, octanetriyl group, nonanetriyl group, decantriyl group, dodecantriyl group, Examples include a hexadecantriyl group. As alkanetetrayl group, methanetetrayl group, ethanetetrayl group, propanetetrayl group, butanetetrayl group, pentanetetrayl group, hexanetetrayl group, heptanetetrayl group, octanetetrayl group, nonanetetrayl group Decanetetrayl group, dodecanetetrayl group, hexadecanetetrayl group and the like. These aliphatic groups may contain a substituent, such as an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 15 carbon atoms, a halogen atom, a nitro group, an amide group, a hydroxyl group, or an ester group. , Ether group, aldehyde group and the like.

  Examples of the alicyclic group include a cycloalkylene group having 3 to 20 carbon atoms, a cycloalkanetriyl group having 3 to 20 carbon atoms, and a cycloalkanetetrayl group having 3 to 20 carbon atoms. Examples of the cycloalkylene group include a cyclopropylene group, a cyclobutylene group, a cyclopentylene group, a cyclohexylene group, a cycloheptylene group, a cyclooctylene group, a cyclononylene group, a cyclodecylene group, a cyclododecylene group, and a cyclohexadecylene group. As the alkanetriyl group, cyclopropanetriyl group, cyclobutanetriyl group, cyclopentanetriyl group, cyclohexanetriyl group, cycloheptanetriyl group, cyclooctanetriyl group, cyclononanetriyl group, cyclodecanetriyl group , Cyclododecanetriyl group, cyclohexadecanetriyl group and the like. As the alkanetetrayl group, cyclopropanetetrayl group, cyclobutanetetrayl group, cyclopentanetetrayl group, cyclohexanetetrayl group, cycloheptanetetrayl group, cyclooctanetetrayl group, cyclononanetetrayl group, cyclodecanetetrayl group Group, cyclododecanetetrayl group, cyclohexadecanetetrayl group and the like. These alicyclic groups may contain a substituent, such as an alkyl group having 1 to 20 carbon atoms, an arylene group having 6 to 15 carbon atoms, a halogen atom, a nitro group, an amide group, a hydroxyl group, and an ester. Group, ether group, aldehyde group and the like.

  As an aromatic group, each of which contains a hetero atom and may have a heterocyclic structure, an arylene group having 5 to 15 carbon atoms, an arenetriyl group having 5 to 15 carbon atoms, an arenetetra having 5 to 15 carbon atoms Yl group. Examples of the arylene group include a phenylene group and a naphthalenediyl group. Examples of the arenetriyl group (trivalent) include a benzenetriyl group and a naphthalenetriyl group. Examples of the arenetetrayl group (tetravalent) include a benzenetetrayl group and a naphthalenetetrayl group. These aromatic groups may be substituted. Examples of the substituent include an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 15 carbon atoms, a halogen atom, a nitro group, an amide group, a hydroxyl group, an ester group, an ether group, and an aldehyde group.

Ar ¹ , Ar ² , R ¹ , R ² , X ¹ , X ² and X ³ may contain a hetero atom, and when Q is a divalent linking group, Ar ¹ , Ar ² , R ¹ , R ² , X ¹ , X ² and X ³ are all divalent groups. When Q is a trivalent linking group, one of Ar ¹ , Ar ² , R ¹ , R ² , X ¹ , X ² and X ³ is a trivalent group. When Q is a tetravalent linking group, one of Ar ¹ , Ar ² , R ¹ , R ² , X ¹ , X ² and X ³ is a tetravalent group or two are trivalent It is a group.

  Examples of the cyclic carbodiimide used in the present invention include compounds represented by the following formulas (5), (7) and (8).

式中、Ｑは、下記式（６−１）、（６−２）または（６−３）で表される２価の結合基である。

<Cyclic carbodiimide (2)>

In the formula, Q is a divalent linking group represented by the following formula (6-1), (6-2) or (6-3).

In the formula, Ar _a ¹ and Ar _a ² are each independently a divalent aromatic group having 5 to 15 carbon atoms. R _a ¹ and R _a ² are each independently a divalent aliphatic group having 1 to 20 carbon atoms, a divalent alicyclic group having 3 to 20 carbon atoms, and a combination thereof, or these aliphatic groups, It is a combination of an alicyclic group and a divalent aromatic group having 5 to 15 carbon atoms. s _a is an integer of 0. k _a is an integer of 0 to 10. X _a ¹ and X _a ² are each independently a divalent aliphatic group having 1 to 20 carbon atoms, a divalent carbon group having 3 to 20 alicyclic groups, or a divalent aromatic group having 5 to 15 carbon atoms. A group, or a combination thereof. X _a ³ is preferably a divalent aliphatic group having 1 to 20 carbon atoms, a divalent alicyclic group having 3 to 20 carbon atoms, a divalent aromatic group having 5 to 15 carbon atoms, or a combination thereof, is there. However, Ar _a ¹ , Ar _a ² , R _a ¹ , R _a ² , X _a ¹ , X _a ² and X _a ³ may contain a hetero atom. Examples of the cyclic carbodiimide compound (2) include the following compounds.

式中、Ｑ_ｂは、下記式（７−１）、（７−２）または（７−３）で表される３価の結合基であり、Ｙは環状構造を担持する担体である。

<Cyclic carbodiimide (3)>

Wherein, _{Q b} is the following formula (7-1), a trivalent bonding group represented by (7-2) or (7-3), Y is a carrier that supports a cyclic structure.

_{^{Wherein, Ar b 1, Ar b 2}} , R b 1, R b 2, X b 1, X b 2, X b 3, s b and k _b are each formula (1-1) to (1-3 ) Are the same as Ar ¹ , Ar ² , R ¹ , R ² , X ¹ , X ² , X ³ , s and k. However, one of these is a trivalent group.
Y is a single bond, a double bond, an atom, an atomic group or a polymer. Y is a bonding portion, and a plurality of cyclic structures are bonded via Y to form a structure represented by the formula (7). Examples of the cyclic carbodiimide compound (7) include the following compounds.

式中、Ｑ_ｃは、下記式（８−１）、（８−２）または（８−３）で表される４価の結合基であり、Ｚ^１およびＺ^２は環状構造を担持する担体である。Ｚ^１およびＺ^２は、互いに結合して環状構造を形成していてもよい。

Ａｒ_ｃ ^１、Ａｒ_ｃ ^２、Ｒ_ｃ ^１、Ｒ_ｃ ^２、Ｘ_ｃ ^１、Ｘ_ｃ ^２、Ｘ_ｃ ^３、ｓ_cおよびｋ_cは、各々式（１−１）〜（１−３）の、Ａｒ^１、Ａｒ^２、Ｒ^１、Ｒ^２、Ｘ^１、Ｘ^２、Ｘ^３、ｓおよびｋと同じである。但し、Ａｒ_ｃ ^１、Ａｒ_ｃ ^２、Ｒ_ｃ ^１、Ｒ_ｃ ^２、Ｘ_ｃ ^１、Ｘ_ｃ ^２およびＸ_ｃ ^３は、これらの内の一つが４価の基であるか、二つが３価の基である。 <Cyclic carbodiimide (4)>

In the formula, Q _c is a tetravalent linking group represented by the following formula (8-1), (8-2) or (8-3), and Z ¹ and Z ² are carriers carrying a cyclic structure. It is. Z ¹ and Z ² may be bonded to each other to form a cyclic structure.

Ar _c ¹ , Ar _c ² , R _c ¹ , R _c ² , X _c ¹ , X _c ² , X _c ³ , s _c and k _c are respectively represented by the formulas (1-1) to (1-3): The same as Ar ¹ , Ar ² , R ¹ , R ² , X ¹ , X ² , X ³ , s and k. Provided that Ar _c ¹ , Ar _c ² , R _c ¹ , R _c ² , X _c ¹ , X _c ² and X _c ³ are one of which is a tetravalent group or two of which are trivalent It is a group.

Z ¹ and Z ² are each independently a single bond, a double bond, an atom, an atomic group or a polymer. Z ¹ and Z ² are bonding parts, and a plurality of cyclic structures are bonded via Z ¹ and Z ² to form a structure represented by the formula (8). Examples of the cyclic carbodiimide compound (8) include the following compounds.

  The content of the cyclic carbodiimide compound is 0.001 to 10 parts by weight, preferably 0.01 to 7 parts by weight, more preferably 0.1 to 100 parts by weight of the polylactic acid resin (component A). Parts by weight to 5 parts by weight. When the content of the cyclic carbodiimide compound is less than 0.001 part by weight, the number of carbodiimide groups of the cyclic carbodiimide is too small with respect to the terminal amount of the polylactic acid resin (component A), so that sufficient hydrolysis resistance is improved. The effect is not obtained. Moreover, when there are more addition amounts of a cyclic carbodiimide compound than 10 weight part, a hydrolysis resistance will be deteriorated on the contrary.

<Method for producing cyclic carbodiimide compound>
The cyclic carbodiimide compound can be produced by a conventionally known method. For example, a method for producing an amine body via an isocyanate body, a method for producing an amine body via an isothiocyanate body, a method for producing an amine body via a triphenylphosphine body, a urea body from an amine body The method of manufacturing via a thiourea body, the method of manufacturing via a thiourea body, the method of manufacturing from a carboxylic acid body via an isocyanate body, the method of manufacturing a lactam body, etc. are mentioned.

  In addition, the cyclic carbodiimide compound of the present invention can be produced by combining and modifying the methods described in the following documents, and an appropriate method can be adopted depending on the compound to be produced.

Tetrahedron Letters, Vol. 34, no. 32, 515-5158, 1993.
Medium- and Large-Membered Rings from Bis (iminophosphoranes): An Efficient Preparation of Cyclic Carbidiimides, Pedro Molina et al.
Journal of Organic Chemistry, Vol. 61, no. 13, 4289-4299, 1996.
New Models for the Study of the Racemization Mechanism of Carbodiimides. Synthesis and Structure (X-ray Crystallography and 1H NMR) of Cyclic Carbodiimides, Pedro Molina et al.
Journal of Organic Chemistry, Vol. 43, No8, 1944-1946, 1978.
Macrocyclic Ureas As Masked Isocynates, Henri Ulrich et al.
Journal of Organic Chemistry, Vol. 48, no. 10, 1694-1700, 1983.
Synthesis and Reactions of Cyclic Carbodiimides,
R. Richter et al.
Journal of Organic Chemistry, Vol. 59, no. 24, 7306-7315, 1994.
A New and Efficient Preparation of Cyclic Carbodiamids from Bis (iminophosphoranea) and the System Boc ₂ O / DMAP, Pedro Molina et al.

Depending on the compound to be produced, an appropriate production method may be employed. For example, (1) nitrophenol represented by the following formula (a-1), nitrophenol represented by the following formula (a-2), and A step of reacting a compound represented by the following formula (b) to obtain a nitro compound represented by the following formula (c);

(2) A step of reducing the obtained nitro body to obtain an amine body represented by the following formula (d);

(3) a step of reacting the obtained amine body with triphenylphosphine dibromide to obtain a triphenylphosphine body represented by the following formula (e); and

(4) What was manufactured by the process of carrying out the direct decarboxylation after isocyanate-izing the obtained triphenylphosphine body in a reaction system can be used suitably as a cyclic carbodiimide compound used for this invention. (In the above formula, Ar ¹ and Ar ² are each independently an aromatic group optionally substituted with an alkyl group having 1 to 6 carbon atoms or a phenyl group. E ¹ and E ² are each independently a halogen atom. A group selected from the group consisting of an atom, a toluenesulfonyloxy group, a methanesulfonyloxy group, a benzenesulfonyloxy group, and a p-bromobenzenesulfonyloxy group, Ar ^a is a phenyl group, X is represented by the following formula (i -1) to (i-3).

（式中、ｎ^ｉ−１は１〜６の整数である。）

(Where n ^i-1 is an integer of ¹ to 6)

（式中、ｍ^ｉ−２およびｎ^ｉ−２は各々独立に０〜３の整数である。）

(In the formula, ^mi-2 and ^ni-2 are each independently an integer of 0-3.)

（式中、Ｒ^ｉ−３およびＲ’^ｉ−３は各々独立に、炭素数１〜６のアルキル基、フェニル基を表す。）

(In the formula, R ^i-3 and R ′ ^i-3 each independently represent an alkyl group having 1 to 6 carbon atoms or a phenyl group.)

<About component C>
The resin composition of the present invention contains at least one antioxidant selected from the group consisting of hindered phenol compounds, phosphite compounds, phosphonite compounds, and thioether compounds as an antioxidant (C component). use. By blending an antioxidant (component C), not only the hue and fluidity during molding process are stabilized, but also the hydrolysis resistance is improved.

  Examples of the hindered phenol compound include α-tocopherol, butylhydroxytoluene, sinapyl alcohol, vitamin E, n-octadecyl-β- (4′-hydroxy-3 ′, 5′-di-tert-butylfel) propionate. 2-tert-butyl-6- (3′-tert-butyl-5′-methyl-2′-hydroxybenzyl) -4-methylphenyl acrylate, 2,6-di-tert-butyl-4- (N, N-dimethylaminomethyl) phenol, 3,5-di-tert-butyl-4-hydroxybenzylphosphonate diethyl ester, 2,2′-methylenebis (4-methyl-6-tert-butylphenol), 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 4,4′-methylenebi (2,6-di-tert-butylphenol), 2,2′-methylenebis (4-methyl-6-cyclohexylphenol), 2,2′-dimethylene-bis (6-α-methyl-benzyl-p-cresol) ) 2,2′-ethylidene-bis (4,6-di-tert-butylphenol), 2,2′-butylidene-bis (4-methyl-6-tert-butylphenol), 4,4′-butylidenebis (3- Methyl-6-tert-butylphenol), triethylene glycol-N-bis-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate, 1,6-hexanediol bis [3- (3 , 5-di-tert-butyl-4-hydroxyphenyl) propionate], bis [2-tert-butyl-4-methyl 6- ( -Tert-butyl-5-methyl-2-hydroxybenzyl) phenyl] terephthalate, 3,9-bis {2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1 , 1, -dimethylethyl} -2,4,8,10-tetraoxaspiro [5,5] undecane, 4,4′-thiobis (6-tert-butyl-m-cresol), 4,4′-thiobis (3-methyl-6-tert-butylphenol), 2,2′-thiobis (4-methyl-6-tert-butylphenol), bis (3,5-di-tert-butyl-4-hydroxybenzyl) sulfide, 4 , 4′-di-thiobis (2,6-di-tert-butylphenol), 4,4′-tri-thiobis (2,6-di-tert-butylphenol) ), 2,2-thiodiethylenebis- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 2,4-bis (n-octylthio) -6- (4-hydroxy -3 ′, 5′-di-tert-butylanilino) -1,3,5-triazine, N, N′-hexamethylenebis- (3,5-di-tert-butyl-4-hydroxyhydrocinnamide), N, N′-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyl] hydrazine, 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butyl Phenyl) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, tris (3,5-di-tert-butyl) 4-hydroxyphenyl) isocyanurate, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris (4-tert-butyl-3-hydroxy-2,6- Dimethylbenzyl) isocyanurate, 1,3,5-tris 2 [3 (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl isocyanurate, and tetrakis [methylene-3- (3 ′, 5′-di-tert-butyl-4-hydroxyphenyl) propionate] methane and the like. Among the above compounds, tetrakis [methylene-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate] methane, octadecyl-3- (3,5-di-tert-butyl-) is used in the present invention. 4-hydroxyphenyl) propionate and 3,9-bis [2- {3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4 , 8,10-Tetraoxaspiro [5,5] undecane is preferably used. Particularly preferred is octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate. All of these are readily available. The said hindered phenol type compound can be used individually or in combination of 2 or more types.

  Examples of phosphite compounds include triphenyl phosphite, tris (nonylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite, dioctyl monophenyl phosphite, diisopropyl mono Phenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, tris (diethylphenyl) phosphite, tris (di-iso-propylphenyl) phosphite, tris (di-n-butylphenyl) ) Phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tris (2,6-di-tert-butylphenyl) phosphite, distearyl pentae Thritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis ( 2,6-di-tert-butyl-4-ethylphenyl) pentaerythritol diphosphite, bis {2,4-bis (1-methyl-1-phenylethyl) phenyl} pentaerythritol diphosphite, phenylbisphenol A penta Examples include erythritol diphosphite, bis (nonylphenyl) pentaerythritol diphosphite, and dicyclohexylpentaerythritol diphosphite. Furthermore, as other phosphite compounds, those that react with dihydric phenols and have a cyclic structure can be used. For example, 2,2′-methylenebis (4,6-di-tert-butylphenyl) (2,4-di-tert-butylphenyl) phosphite, 2,2′-methylenebis (4,6-di-tert- Butylphenyl) (2-tert-butyl-4-methylphenyl) phosphite, 2,2-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, and the like. Suitable phosphite compounds are distearyl pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methyl). Phenyl) pentaerythritol diphosphite, and bis {2,4-bis (1-methyl-1-phenylethyl) phenyl} pentaerythritol diphosphite. All of these are readily available. The above phosphite compounds can be used alone or in combination of two or more.

  Examples of the phosphonite compound include tetrakis (2,4-di-tert-butylphenyl) -4,4′-biphenylenediphosphonite, tetrakis (2,4-di-tert-butylphenyl) -4,3′-biphenyl. Range phosphonite, tetrakis (2,4-di-tert-butylphenyl) -3,3'-biphenylene diphosphonite, tetrakis (2,6-di-tert-butylphenyl) -4,4'-biphenylene diphospho Knight, tetrakis (2,6-di-tert-butylphenyl) -4,3′-biphenylene diphosphonite, tetrakis (2,6-di-tert-butylphenyl) -3,3′-biphenylene diphosphonite, Bis (2,4-di-tert-butylphenyl) -4-phenyl-phenylphosphonite, bis (2,4- -Tert-butylphenyl) -3-phenyl-phenylphosphonite, bis (2,6-di-n-butylphenyl) -3-phenyl-phenylphosphonite, bis (2,6-di-tert-butylphenyl) Examples include -4-phenyl-phenyl phosphonite, bis (2,6-di-tert-butylphenyl) -3-phenyl-phenyl phosphonite. Tetrakis (di-tert-butylphenyl) -biphenylenediphosphonite, bis (di-tert-butylphenyl) -phenyl-phenylphosphonite are preferred, and tetrakis (2,4-di-tert-butylphenyl) -biphenylenediphosphonite Knight and bis (2,4-di-tert-butylphenyl) -phenyl-phenylphosphonite are more preferred. Such a phosphonite compound is preferable because it can be used in combination with a phosphite compound having an aryl group in which two or more alkyl groups are substituted. The phosphonite compound is preferably tetrakis (2,4-di-tert-butylphenyl) -biphenylenediphosphonite, and stabilizers based on the phosphonite are Sandostab P-EPQ (trademark, manufactured by Clariant) and Irgafos. P-EPQ (trademark, manufactured by CIBA SPECIALTY CHEMICALS) is commercially available and any of them can be used. The said phosphonite type compound can be used individually or in combination of 2 or more types.

  Specific examples of thioether compounds include dilauryl thiodipropionate, ditridecyl thiodipropionate, dimyristyl thiodipropionate, distearyl thiodipropionate, pentaerythritol-tetrakis (3-lauryl thiopropionate), Pentaerythritol-tetrakis (3-dodecylthiopropionate), pentaerythritol-tetrakis (3-octadecylthiopropionate), pentaerythritol tetrakis (3-myristylthiopropionate), pentaerythritol-tetrakis (3-stearylthio) Propionate) and the like. The said thioether type compound can be used individually or in combination of 2 or more types.

  Content of antioxidant is 0.001-2 weight part with respect to 100 weight part of polylactic acid (A component), Preferably it is 0.005-1 weight part, More preferably, it is 0.01-0.5. Parts by weight. When the blending amount is less than 0.001 part by weight, the antioxidant effect is insufficient, and not only the hue and fluidity during the molding process become unstable, but also the hydrolysis resistance deteriorates. On the other hand, when the blending amount is more than 2 parts by weight, the reaction component derived from the antioxidant and the like deteriorates the hydrolysis resistance.

  Further, it is preferable to use a combination of one or more of the hindered phenol compounds and phosphite compounds, phosphonite compounds, and thioether compounds. By using a combination of one or more of hindered phenol compounds and phosphite compounds, phosphonite compounds, and thioether compounds, a synergistic effect as a stabilizer is exhibited, and hue and flow during molding are further improved. It is effective in stabilizing the properties and improving the hydrolysis resistance.

<About D component>
The end-blocking agent of component D is a component that reacts with a part or all of the carboxyl group ends of polylactic acid (component A) to block and is an addition reaction type such as an epoxy compound, an oxazoline compound, or an oxazine compound. It is a compound of this. Here, the cyclic carbodiimide of the B component is not included in the terminal blocking agent (D component). If an addition reaction type compound is used, it is not necessary to discharge extra by-products out of the reaction system as in the case of end-capping by dehydration condensation reaction of alcohol and carboxyl group. Therefore, by adding, mixing, and reacting an addition reaction type end-capping agent, it is possible to obtain a sufficient carboxyl group end-capping effect while suppressing decomposition of the resin by a by-product, and practically sufficient resistance. A resin composition having hydrolyzability and a molded product made of the resin composition can be obtained.

  Examples of epoxy compounds among the end-capping agents that can be used in the present invention include, for example, N-glycidylphthalimide, N-glycidyl-4-methylphthalimide, N-glycidyl-4,5-dimethylphthalimide, N-glycidyl- 3-methylphthalimide, N-glycidyl-3,6-dimethylphthalimide, N-glycidyl-4-ethoxyphthalimide, N-glycidyl-4-chlorophthalimide, N-glycidyl-4,5-dichlorophthalimide, N-glycidyl- 3,4,5,6-tetrabromophthalimide, N-glycidyl-4-n-butyl-5-bromophthalimide, N-glycidylsuccinimide, N-glycidylhexahydrophthalimide, N-glycidyl-1,2,3 6-tetrahydrophthalimide, N-glycidyl male N-glycidyl-α, β-dimethylsuccinimide, N-glycidyl-α-ethylsuccinimide, N-glycidyl-α-propylsuccinimide, N-glycidylbenzamide, N-glycidyl-p-methylbenzamide, N- Glycidylnaphthamide, N-glycidylsteramide, N-methyl-4,5-epoxycyclohexane-1,2-dicarboxylic imide, N-ethyl-4,5-epoxycyclohexane-1,2-dicarboxylic imide, N- Phenyl-4,5-epoxycyclohexane-1,2-dicarboxylic imide, N-naphthyl-4,5-epoxycyclohexane-1,2-dicarboxylic imide, N-tolyl-3-methyl-4,5-epoxycyclohexane -1,2-dicarboxylic acid imide, orthophenyl phenylglycol Sidyl ether, 2-methyloctyl glycidyl ether, phenyl glycidyl ether, 3- (2-xenyloxy) -1,2-epoxypropane, allyl glycidyl ether, butyl glycidyl ether, lauryl glycidyl ether, benzyl glycidyl ether, cyclohexyl glycidyl ether, α -Cresyl glycidyl ether, p-tert-butylphenyl glycidyl ether, glycidyl methacrylate, ethylene oxide, propylene oxide, styrene oxide, octylene oxide, hydroquinone diglycidyl ether, resorcin diglycidyl ether, 1,6-hexanediol di Glycidyl ether, hydrogenated bisphenol A-diglycidyl ether, terephthalic acid diglycidyl ester, Lahydrophthalic acid diglycidyl ester, hexahydrophthalic acid diglycidyl ester, phthalic acid dimethyl diglycidyl ester, phenylene diglycidyl ether, ethylene diglycidyl ether, trimethylene diglycidyl ether, tetramethylene diglycidyl ether, hexamethylene diglycidyl ether, 3 , 4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, bis (3,4-epoxycyclohexylmethyl) adipate, vinylcyclohexene diepoxide and the like. Furthermore, in the present invention, a polymer containing an epoxy group can be used, and an acrylic polymer can be preferably used because of compatibility with polylactic acid. As such a polymer, for example, a polymer of (meth) acrylic acid ester monomers containing an epoxy group, a (meth) acrylic acid ester monomer containing an epoxy group and a (meth) acrylic acid ester monomer Copolymer of acrylate monomers having an epoxy group, copolymer of acrylate monomer and acrylate monomer having an epoxy group, (meth) having an epoxy group Examples thereof include a copolymer of an acrylate monomer and an acrylate monomer, and a copolymer of an acrylate monomer having an epoxy group and a (meth) acrylate monomer. In addition, as an acrylic-styrene copolymer having an epoxy group, a copolymer of a styrene monomer and a (meth) acrylic acid ester monomer having an epoxy group, an acrylic acid having a styrene monomer and an epoxy group Examples include a copolymer of ester monomers. One or more compounds selected from these epoxy compounds may be arbitrarily selected to block the carboxyl terminal of the polylactic acid unit, but in terms of reactivity, ethylene oxide, propylene oxide, phenyl glycidyl ether, ortho Preferred are phenylphenyl glycidyl ether, p-tert-butylphenyl glycidyl ether, N-glycidyl phthalimide, hydroquinone diglycidyl ether, resorcin diglycidyl ether, 1,6-hexanediol diglycidyl ether, hydrogenated bisphenol A-diglycidyl ether, and the like. .

  Examples of oxazoline compounds among the end-capping agents that can be used in the present invention include, for example, 2-methoxy-2-oxazoline, 2-ethoxy-2-oxazoline, 2-propoxy-2-oxazoline, 2-butoxy-2 -Oxazoline, 2-pentyloxy-2-oxazoline, 2-hexyloxy-2-oxazoline, 2-heptyloxy-2-oxazoline, 2-octyloxy-2-oxazoline, 2-nonyloxy-2-oxazoline, 2-decyloxy -2-oxazoline, 2-cyclopentyloxy-2-oxazoline, 2-cyclohexyloxy-2-oxazoline, 2-allyloxy-2-oxazoline, 2-methallyloxy-2-oxazoline, 2-crotyloxy-2-oxazoline, 2 -Phenoxy-2-oxazo , 2-cresyl-2-oxazoline, 2-o-ethylphenoxy-2-oxazoline, 2-o-propylphenoxy-2-oxazoline, 2-o-phenylphenoxy-2-oxazoline, 2-m-ethylphenoxy- 2-oxazoline, 2-m-propylphenoxy-2-oxazoline, 2-p-phenylphenoxy-2-oxazoline, 2-methyl-2-oxazoline, 2-ethyl-2-oxazoline, 2-propyl-2-oxazoline, 2-butyl-2-oxazoline, 2-pentyl-2-oxazoline, 2-hexyl-2-oxazoline, 2-heptyl-2-oxazoline, 2-octyl-2-oxazoline, 2-nonyl-2-oxazoline, 2- Decyl-2-oxazoline, 2-cyclopentyl-2-oxazoline, 2-cycl Hexyl-2-oxazoline, 2-allyl-2-oxazoline, 2-methallyl-2-oxazoline, 2-crotyl-2-oxazoline, 2-phenyl-2-oxazoline, 2-o-ethylphenyl-2-oxazoline, 2 -O-propylphenyl-2-oxazoline, 2-o-phenylphenyl-2-oxazoline, 2-m-ethylphenyl-2-oxazoline, 2-m-propylphenyl-2-oxazoline, 2-p-phenylphenyl- 2-oxazoline and the like, and further, 2,2'-bis (2-oxazoline), 2,2'-bis (4-methyl-2-oxazoline), 2,2'-bis (4,4 ' -Dimethyl-2-oxazoline), 2,2'-bis (4-ethyl-2-oxazoline), 2,2'-bis (4,4'-diethyl-2) -Oxazoline), 2,2'-bis (4-propyl-2-oxazoline), 2,2'-bis (4-butyl-2-oxazoline), 2,2'-bis (4-hexyl-2-oxazoline) ), 2,2'-bis (4-phenyl-2-oxazoline), 2,2'-bis (4-cyclohexyl-2-oxazoline), 2,2'-bis (4-benzyl-2-oxazoline), 2,2'-p-phenylenebis (2-oxazoline), 2,2'-m-phenylenebis (2-oxazoline), 2,2'-o-phenylenebis (2-oxazoline), 2,2'- p-phenylenebis (4-methyl-2-oxazoline), 2,2'-p-phenylenebis (4,4'-dimethyl-2-oxazoline), 2,2'-m-phenylenebis (4-methyl- 2-oxazoline), , 2'-m-phenylenebis (4,4'-dimethyl-2-oxazoline), 2,2'-ethylenebis (2-oxazoline), 2,2'-tetramethylenebis (2-oxazoline), 2, 2'-hexamethylenebis (2-oxazoline), 2,2'-octamethylenebis (2-oxazoline), 2,2'-decamethylenebis (2-oxazoline), 2,2'-ethylenebis (4- Methyl-2-oxazoline), 2,2′-tetramethylenebis (4,4′-dimethyl-2-oxazoline), 2,2′-9,9′-diphenoxyethanebis (2-oxazoline), 2, Examples thereof include 2'-cyclohexylenebis (2-oxazoline) and 2,2'-diphenylenebis (2-oxazoline). Furthermore, a polyoxazoline compound containing the above-described compound as a monomer unit, such as a styrene-2-isopropenyl-2-oxazoline copolymer, can be mentioned. One or more compounds may be arbitrarily selected from these oxazoline compounds to block the carboxyl terminal of the polylactic acid unit.

  Examples of the oxazine compound among the end-capping agents that can be used in the present invention include, for example, 2-methoxy-5,6-dihydro-4H-1,3-oxazine, 2-ethoxy-5,6-dihydro-4H. -1,3-oxazine, 2-propoxy-5,6-dihydro-4H-1,3-oxazine, 2-butoxy-5,6-dihydro-4H-1,3-oxazine, 2-pentyloxy-5 6-dihydro-4H-1,3-oxazine, 2-hexyloxy-5,6-dihydro-4H-1,3-oxazine, 2-heptyloxy-5,6-dihydro-4H-1,3-oxazine, 2-octyloxy-5,6-dihydro-4H-1,3-oxazine, 2-nonyloxy-5,6-dihydro-4H-1,3-oxazine, 2-decyloxy-5,6-dihydro 4H-1,3-oxazine, 2-cyclopentyloxy-5,6-dihydro-4H-1,3-oxazine, 2-cyclohexyloxy-5,6-dihydro-4H-1,3-oxazine, 2-allyloxy- 5,6-dihydro-4H-1,3-oxazine, 2-methallyloxy-5,6-dihydro-4H-1,3-oxazine, 2-crotyloxy-5,6-dihydro-4H-1,3- Oxazine and the like, and 2,2'-bis (5,6-dihydro-4H-1,3-oxazine), 2,2'-methylenebis (5,6-dihydro-4H-1,3- Oxazine), 2,2'-ethylenebis (5,6-dihydro-4H-1,3-oxazine), 2,2'-propylenebis (5,6-dihydro-4H-1,3-oxazine), 2 , 2 ' Butylene bis (5,6-dihydro-4H-1,3-oxazine), 2,2′-hexamethylene bis (5,6-dihydro-4H-1,3-oxazine), 2,2′-p-phenylene bis (5,6-dihydro-4H-1,3-oxazine), 2,2'-m-phenylenebis (5,6-dihydro-4H-1,3-oxazine), 2,2'-naphthylenebis (5 6-dihydro-4H-1,3-oxazine), 2,2'-P, P'-diphenylenebis (5,6-dihydro-4H-1,3-oxazine) and the like. Furthermore, the polyoxazine compound etc. which contain an above-described compound as a monomer unit are mentioned. One or two or more compounds may be arbitrarily selected from these oxazine compounds to block the carboxyl terminal of the polylactic acid unit.

  Furthermore, one or more compounds may be arbitrarily selected from the oxazoline compounds already exemplified and the above-mentioned oxazine compounds and used together to block the carboxyl terminal of the polylactic acid resin. 2,2'-m-phenylenebis (2-oxazoline) and 2,2'-p-phenylenebis (2-oxazoline) are preferable from the viewpoint of reactivity and affinity with polylactic acid resin.

  Moreover, 2 or more types of compounds can also be used together as a terminal blocker among the epoxy compounds mentioned above as a terminal blocker which can be used for this invention, an oxazoline compound, and an oxazine compound.

As a specific degree of carboxyl group terminal blocking, the concentration of the carboxyl group terminal of the polylactic acid resin is preferably 10 equivalents / 10 ³ kg or less from the viewpoint of improving hydrolysis resistance, and 6 equivalents / 10 ³ kg or less. More preferably it is.

  As a method for blocking the carboxyl group terminal of polylactic acid (component A), an end-blocking agent may be reacted. As a method for blocking the carboxyl group terminal by addition reaction, an epoxy compound or oxazoline in the molten state of polylactic acid. It can be obtained by reacting an appropriate amount of a compound and an end-capping agent such as an oxazine compound, and the end-capping agent can be added and reacted after completion of the polymerization reaction of the polymer.

  The content of the terminal blocking agent (component D) is preferably 0.001 to 10 parts by weight, more preferably 0.01 to 5 parts by weight, more preferably 100 parts by weight of the polylactic acid component (component A). Preferably it is 0.1-3 weight part. If the content is less than 0.001 part by weight, the amount of the end-capping agent added to the carboxyl terminal is too small, and sufficient hydrolysis resistance cannot be obtained. If the content exceeds 10 parts by weight, gelation occurs and the fluidity is increased. It drops significantly.

<About E component>
In this invention, a hydrotalcite (E component) can be included. The hydrotalcite (E component) used in the present invention is preferably a synthetic hydrotalcite represented by the following general formula (9).

（式中のＭ^２＋はマグネシウムイオン、亜鉛イオン等の２価の金属イオン、Ｎ^３＋はアルミニウムイオン、クロムイオン等の３価の金属イオン、Ａ^ｎ−はｎ価の層間陰イオンを表し、xは０＜x≦０．３３、ｍは０≦ｍ＜２であり、ｎは１≦ｎ≦５の整数である。）

(Expressed M ²⁺ is magnesium ions in the formula, the divalent metal ions such as zinc ion, N ³⁺ is aluminum ions, trivalent metal ions such as chromium ions, A ^n-is an n-valent interlayer anion, x Is 0 <x ≦ 0.33, m is 0 ≦ m <2, and n is an integer of 1 ≦ n ≦ 5.)

[M ²⁺ _1-X N ³⁺ _x (OH) ₂ ] in the formula (9) is a hydroxide sheet, which is formed by the fact that octahedrons formed by surrounding six OHs with metal ions share each other. . The hydroxide sheets overlap to form a layered structure. [A ⁿ⁻ _{x / n} · mH ₂ O] in the formula (9) represents an n-valent anion and water of crystallization entering between the hydroxide sheets.

M ²⁺ is not particularly limited as long as it is a divalent metal ion, but generally magnesium ion is preferably used. Further, N ³⁺ is not particularly limited as long as it is a trivalent metal ion, typically aluminum ions are preferably used are in, A ^n-is are preferably used carbonate ions.

  The mechanism by which hydrotalcite improves the hydrolysis resistance of polylactic acid is not clear, but it is thought to be because it adsorbs acids that catalyze the hydrolysis reaction of polylactic acid, such as lactic acid generated by thermal decomposition and hydrolysis. .

The hydrotalcite used in the present invention is preferably dehydrated by firing. The temperature for the baking treatment can be arbitrarily selected according to the chemical structure of the hydrotalcite. For ^{example, M 2+} is magnesium ^{ion, N 3+} is aluminum ^{ion, A n-carbonate} ions, magnesium ions: aluminum ion = 2: 1 (x = 0.33 ) if it was, dehydration temperature of crystal water is Since it is 210 ° C., it can be dehydrated by baking at or above this temperature. As x becomes smaller than 0.33, the dehydration temperature of crystal water becomes lower. By using hydrotalcite that has been subjected to dehydration treatment, it is possible to prevent the resin from being decomposed in a process such as extrusion or molding, and thus a resin composition having more excellent hydrolysis resistance can be obtained. Therefore, the range of m in Formula (9) is preferably 0 ≦ m <0.5, and most preferably 0 ≦ m <0.1.

  Moreover, it is preferable that the hydrotalcite used by this invention is surface-treated. Examples of the surface treatment agent include silane coupling agents, titanate coupling agents, silicone compounds, fatty acids, fatty acid salts, synthetic resins, and particularly, fatty acids and fatty acid salts that are familiar with polylactic acid are preferably used. Surface treatment of hydrotalcite not only prevents the degradation of polylactic acid in processes such as extrusion and molding, but also increases the dispersion of hydrotalcite in polylactic acid, effectively adsorbing acid Thus, a resin composition having more excellent hydrolysis resistance can be obtained.

  The fatty acid used for the surface treatment is not particularly limited as long as it is a fatty acid, but a higher fatty acid having a relatively high boiling point and having 12 or more carbon atoms is preferable. Specific examples include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, and the like. The fatty acid salt used for the surface treatment is not particularly limited as long as it is a fatty acid salt, but a higher fatty acid salt having a relatively high boiling point and having 12 or more carbon atoms is preferable. Specific examples include laurate, myristate, palmitate, stearate, oleate, linoleate, and linolenate. As the salt used in the higher fatty acid salt, inorganic compounds such as sodium, potassium and zinc are preferable.

  The present invention may use any of hydrotalcite that has been either dehydrated or untreated, hydrotalcite that has been subjected to dehydration or surface treatment, or hydrotalcite that has been subjected to both dehydration or surface treatment. Preferably, hydrotalcite subjected to either dehydration treatment or surface treatment, more preferably hydrotalcite subjected to both dehydration treatment or surface treatment, can be used.

  DHT-6 (manufactured by Kyowa Chemical Industry Co., Ltd.) is a hydrotalcite that has not been subjected to dehydration or surface treatment, and DHT-4C (Kyowa Chemical Industry Co., Ltd.) is a hydrotalcite that has only been dehydrated. ), As hydrotalcite that is only surface-treated, DHT-4A (manufactured by Kyowa Chemical Industry Co., Ltd.), as hydrotalcite that is both dehydrated and surface-treated, DHT-4A-2 (Manufactured by Kyowa Chemical Industry Co., Ltd.) can be obtained as commercial products.

  The amount of hydrotalcite (component E) added is preferably 0.01 to 0.3 parts by weight, more preferably 0.03 to 0.2 parts by weight, based on 100 parts by weight of the polylactic acid resin (component A). 0.05 to 0.2 parts by weight is most preferred. When the amount of hydrotalcite added is 0.01 parts by weight or less, the effect of improving the hydrolysis resistance cannot be obtained, and when the amount of hydrotalcite added is 0.3 parts by weight or more, the thermal decomposition of the polylactic acid resin is caused. This causes the hydrolysis resistance to deteriorate.

<About F component>
The composition of the present invention may contain an inorganic filler (F component). By containing an inorganic filler, a composition having excellent mechanical properties, heat resistance, and moldability can be obtained. As the inorganic filler used in the present invention, a fibrous, plate-like, or powder-like material used for reinforcing ordinary thermoplastic resins can be used.

  Specifically, for example, carbon nanotube, glass fiber, asbestos fiber, carbon fiber, graphite fiber, metal fiber, potassium titanate whisker, aluminum borate whisker, magnesium whisker, silicon whisker, wollastonite, imogolite, sepiolite, Asbestos, slag fiber, zonolite, gypsum fiber, silica fiber, silica. Fibrous inorganic fillers such as alumina fiber, zirconia fiber, boron nitride fiber, silicon nitride fiber and boron fiber, layered silicate, layered silicate exchanged with organic onium ions, glass flake, non-swellable mica, graphite, metal Foil, ceramic beads, talc, clay, mica, sericite, zeolite, bentonite, dolomite, kaolin, powdered silicic acid, feldspar powder, potassium titanate, shirasu balloon, calcium carbonate, magnesium carbonate, barium sulfate, calcium oxide, aluminum oxide, Examples thereof include plate-like and particulate inorganic fillers such as carbon nanoparticles such as titanium oxide, aluminum silicate, silicon oxide, gypsum, novaculite, dawsonite, and white clay fullerene.

  Specific examples of layered silicates include smectite clay minerals such as montmorillonite, beidellite, nontronite, saponite, hectorite, and soconite, various clay minerals such as vermiculite, halosite, kanemite, and kenyanite, Li-type fluorine teniolite, Na And swellable mica such as Li-type fluorine teniolite, Li-type tetrasilicon fluorine mica and Na-type tetrasilicon fluorine mica. These may be natural or synthetic. Among these, smectite clay minerals such as montmorillonite and hectorite, and swellable synthetic mica such as Li type fluorine teniolite and Na type tetrasilicon fluorine mica are preferable.

  Among these inorganic fillers, fibrous or plate-like inorganic fillers are preferable, and glass fiber, wollastonite, aluminum borate whisker, potassium titanate whisker, mica, and kaolin, a cation-exchanged layered silicate. Is preferred. The aspect ratio of the fibrous filler is preferably 5 or more, more preferably 10 or more, and further preferably 20 or more.

  Such a filler may be coated or converged with a thermoplastic resin such as an ethylene / vinyl acetate copolymer or a thermosetting resin such as an epoxy resin, or may be treated with a coupling agent such as aminosilane or epoxysilane. May be.

  The content of the inorganic filler (component F) is preferably 0.05 to 150 parts by weight, more preferably 0.5 to 100 parts by weight, still more preferably 1 to 100 parts by weight of polylactic acid (component A). 70 parts by weight, particularly preferably 1 to 50 parts by weight, most preferably 1 to 30 parts by weight. When the blending amount is less than 0.05 parts by weight, the reinforcing effect is not sufficient, and when it exceeds 150 parts by weight, the appearance of the molded product is deteriorated or the strands are broken during extrusion.

<About other ingredients>
<Light stabilizer>
The composition of the present invention may contain a light stabilizer. Specific examples of the light stabilizer include benzophenone compounds, benzotriazole compounds, aromatic benzoate compounds, oxalic acid anilide compounds, cyanoacrylate compounds, hindered amine compounds, and the like.

  Examples of the benzophenone compounds include benzophenone, 2,4-dihydroxybenzophenone, 2,2′-dihydroxybenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,2 ′. -Dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxy-5-sulfobenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, 5-chloro-2-hydroxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-methoxy -2 - carboxy benzophenone, 2-hydroxy-4- (2-hydroxy-3-methyl - acryloxy-isopropoxyphenyl) benzophenone.

  Examples of the benzotriazole compound include 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- (3,5-di-tert-butyl-2-hydroxyphenyl) benzotriazole, 2- (3,5- Di-tert-amyl-2-hydroxyphenyl) benzotriazole, 2- (3 ′, 5′-di-tert-butyl-4′-methyl-2′-hydroxyphenyl) benzotriazole, 2- (3,5- Di-tert-amyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (5-tert-butyl-2-hydroxyphenyl) benzotriazole, 2- [2′-hydroxy-3 ′, 5′-bis (Α, α-Dimethylbenzyl) phenyl] benzotriazole, 2- [2′-hydroxy-3 ′, 5′-bis (α, α Dimethylbenzyl) phenyl] -2H- benzotriazole, 2- (4'-octoxy-2'-hydroxyphenyl) benzotriazole.

  Examples of the aromatic benzoate compounds include alkylphenyl salicylates such as p-tert-butylphenyl salicylate and p-octylphenyl salicylate.

  Examples of oxalic acid anilide compounds include 2-ethoxy-2′-ethyloxalic acid bisanilide, 2-ethoxy-5-tert-butyl-2′-ethyloxalic acid bisanilide, and 2-ethoxy-3′-. Examples include dodecyl oxalic acid bisanilide.

  Examples of the cyanoacrylate compound include ethyl-2-cyano-3,3'-diphenyl acrylate, 2-ethylhexyl-cyano-3,3'-diphenyl acrylate, and the like.

  Examples of hindered amine compounds include 4-acetoxy-2,2,6,6-tetramethylpiperidine, 4-stearoyloxy-2,2,6,6-tetramethylpiperidine, 4-acryloyloxy-2,2,6, 6-tetramethylpiperidine, 4- (phenylacetoxy) -2,2,6,6-tetramethylpiperidine, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 4-methoxy-2,2, 6,6-tetramethylpiperidine, 4-octadecyloxy-2,2,6,6-tetramethylpiperidine, 4-cyclohexyloxy-2,2,6,6-tetramethylpiperidine, 4-benzyloxy-2,2 , 6,6-tetramethylpiperidine, 4-phenoxy-2,2,6,6-tetramethylpiperidine, 4- (ethylcarba Yloxy) -2,2,6,6-tetramethylpiperidine, 4- (cyclohexylcarbamoyloxy) -2,2,6,6-tetramethylpiperidine, 4- (phenylcarbamoyloxy) -2,2,6,6 -Tetramethylpiperidine, bis (2,2,6,6-tetramethyl-4-piperidyl) carbonate, bis (2,2,6,6-tetramethyl-4-piperidyl) oxalate, bis (2,2,6 , 6-tetramethyl-4-piperidyl) malonate, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (2,2,6,6-tetramethylpi-4-peridyl) adipate, bis (2,2,6,6-tetramethylpi-4-peridyl) terephthalate, 1,2-bis (2,2,6,6-tetramethylpi-4-peridylo) Cis) -ethane, α, α′-bis (2,2,6,6-tetramethyl-4-piperidyloxy) -p-xylene, bis (2,2,6,6-tetramethyl-4-piperidyl) -Tolylene-2,4-dicarbamate, bis (2,2,6,6-tetramethyl-4-piperidyl) -hexamethylene-1,6-dicarbamate, tris (2,2,6,6-tetramethyl -4-piperidyl) -benzene-1,3,5-tricarboxylate, tris (2,2,6,6-tetramethyl-4-piperidyl) -benzene-1,3,4-tricarboxylate, 1- “2- {3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy} -2,2,6,6-tetramethylpiperidine, 1,2,3,4-butanetetracarboxylic acid And 1,2,2, , 6-Pentamethyl-4-piperidinol and β, β, β ′, β′-tetramethyl-3,9- [2,4,8,10-tetraoxaspiro (5,5) undecane] dimethanol And the like.

  The content of the light stabilizer is preferably 0.01 to 3 parts by weight, more preferably 0.03 to 2 parts by weight per 100 parts by weight of polylactic acid (component A).

<Crystal Accelerator>
The composition of the present invention may contain a crystallization accelerator. By containing the crystallization accelerator, a molded product having excellent mechanical properties, heat resistance, and moldability can be obtained.
That is, by applying a crystallization accelerator, the moldability and crystallinity of polylactic acid (component A) are improved, and a molded product that is sufficiently crystallized even in normal injection molding and has excellent heat resistance and moist heat resistance is obtained. Can do. In addition, the manufacturing time for manufacturing the molded product can be greatly shortened, and the economic effect is great.
As the crystallization accelerator, either an inorganic crystallization nucleating agent or an organic crystallization nucleating agent can be used.

  As inorganic crystallization nucleating agents, talc, kaolin, silica, synthetic mica, clay, zeolite, graphite, carbon black, zinc oxide, magnesium oxide, titanium oxide, calcium carbonate, calcium sulfate, barium sulfate, calcium sulfide, boron nitride , Montmorillonite, neodymium oxide, aluminum oxide, phenylphosphonate metal salt and the like. These inorganic crystallization nucleating agents are treated with various dispersing aids in order to enhance the dispersibility in the composition and the effect thereof, and are in a highly dispersed state with a primary particle size of about 0.01 to 0.5 μm. Are preferred.

  Organic crystallization nucleating agents include calcium benzoate, sodium benzoate, lithium benzoate, potassium benzoate, magnesium benzoate, barium benzoate, calcium oxalate, disodium terephthalate, dilithium terephthalate, dipotassium terephthalate, Sodium laurate, potassium laurate, sodium myristate, potassium myristate, calcium myristate, barium myristate, sodium octacolate, calcium octacolate, sodium stearate, potassium stearate, lithium stearate, calcium stearate, magnesium stearate , Barium stearate, sodium montanate, calcium montanate, sodium toluate, sodium salicylate, potassium salicylate, salicy Organic carboxylic acid metal salts such as zinc acid, aluminum dibenzoate, β-naphthoic acid sodium, β-naphthoic acid potassium, sodium cyclohexanecarboxylic acid and the like, and organic sulfonic acid metal salts such as sodium p-toluenesulfonate and sodium sulfoisophthalate. Can be mentioned.

  Also, organic carboxylic acid amides such as stearic acid amide, ethylenebislauric acid amide, palmitic acid amide, hydroxystearic acid amide, erucic acid amide, trimesic acid tris (tert-butylamide), low density polyethylene, high density polyethylene, polyiso Propylene, polybutene, poly-4-methylpentene, poly-3-methylbutene-1, polyvinylcycloalkane, polyvinyltrialkylsilane, high melting point polylactic acid, sodium salt of ethylene-acrylic acid copolymer, sodium of styrene-maleic anhydride copolymer Examples thereof include salts (so-called ionomers), benzylidene sorbitol and derivatives thereof such as dibenzylidene sorbitol.

Among these, at least one selected from talc and organic carboxylic acid metal salts is preferably used. Only one type of crystallization nucleating agent may be used in the present invention, or two or more types may be used in combination.
The content of the crystallization accelerator is preferably 0.01 to 30 parts by weight, more preferably 0.05 to 20 parts by weight per 100 parts by weight of polylactic acid (component A).

<Organic filler>
The composition of the present invention can contain an organic filler. By containing the organic filler, a composition excellent in mechanical properties, heat resistance and moldability can be obtained.
Organic fillers such as rice husks, wood chips, okara, waste paper ground materials, clothing ground materials, cotton fibers, hemp fibers, bamboo fibers, wood fibers, kenaf fibers, jute fibers, banana fibers, coconut fibers Plant fibers such as pulp or cellulose fibers processed from these plant fibers and fibrous fibers such as animal fibers such as silk, wool, angora, cashmere and camel, synthetic fibers such as polyester fibers, nylon fibers and acrylic fibers , Paper powder, wood powder, cellulose powder, rice husk powder, fruit husk powder, chitin powder, chitosan powder, protein, starch and the like. From the viewpoint of moldability, powdery materials such as paper powder, wood powder, bamboo powder, cellulose powder, kenaf powder, rice husk powder, fruit husk powder, chitin powder, chitosan powder, protein powder, and starch are preferred. Powder, bamboo powder, cellulose powder and kenaf powder are preferred. Paper powder and wood powder are more preferable. Paper dust is particularly preferable.

These organic fillers may be those directly collected from natural products, but may also be those obtained by recycling waste materials such as waste paper, waste wood and old clothes. The wood is preferably a softwood material such as pine, cedar, oak or fir, or a hardwood material such as beech, shii or eucalyptus.
Paper powder is an adhesive from the viewpoint of moldability, especially emulsion-based adhesives such as vinyl acetate resin-based emulsions and acrylic resin-based emulsions when processing paper, polyvinyl alcohol-based adhesives, polyamide-based adhesives, etc. Preferred examples include those containing a hot melt adhesive.

  In the present invention, the content of the organic filler is preferably 1 to 300 parts by weight, more preferably 5 to 200 parts by weight, and still more preferably 100 parts by weight of polylactic acid (component A) from the viewpoint of moldability and heat resistance. Is 10 to 150 parts by weight, particularly preferably 15 to 100 parts by weight.

<Release agent>
The composition of the present invention may contain a release agent. Specific examples of release agents include fatty acids, fatty acid metal salts, oxy fatty acids, paraffins, low molecular weight polyolefins, fatty acid amides, alkylene bis fatty acid amides, aliphatic ketones, fatty acid partial saponified esters, fatty acid lower alcohol esters, fatty acid polyvalents. Examples include alcohol esters, fatty acid polyglycol esters, and modified silicones. By blending these, a polylactic acid molded product excellent in mechanical properties, moldability, and heat resistance can be obtained.

  Fatty acids having 6 to 40 carbon atoms are preferred. Specifically, oleic acid, stearic acid, lauric acid, hydroxystearic acid, behenic acid, arachidonic acid, linoleic acid, linolenic acid, ricinoleic acid, palmitic acid, montan Examples thereof include acids and mixtures thereof. The fatty acid metal salt is preferably an alkali (earth) metal salt of a fatty acid having 6 to 40 carbon atoms, and specific examples include calcium stearate, sodium montanate, calcium montanate, and the like.

  Examples of the oxy fatty acid include 1,2-oxysteric acid. Paraffin having 18 or more carbon atoms is preferable, and examples thereof include liquid paraffin, natural paraffin, microcrystalline wax, petrolactam and the like.

  As the low molecular weight polyolefin, for example, those having a molecular weight of 5000 or less are preferable, and specific examples include polyethylene wax, maleic acid-modified polyethylene wax, oxidized type polyethylene wax, chlorinated polyethylene wax, and polypropylene wax. Fatty acid amides having 6 or more carbon atoms are preferred, and specific examples include oleic acid amide, erucic acid amide, and behenic acid amide.

  The alkylene bis fatty acid amide is preferably one having 6 or more carbon atoms, and specifically includes methylene bis stearic acid amide, ethylene bis stearic acid amide, N, N-bis (2-hydroxyethyl) stearic acid amide and the like. As the aliphatic ketone, those having 6 or more carbon atoms are preferable, and examples thereof include higher aliphatic ketones.

  Examples of the fatty acid partial saponified ester include a montanic acid partial saponified ester. Examples of the fatty acid lower alcohol ester include stearic acid ester, oleic acid ester, linoleic acid ester, linolenic acid ester, adipic acid ester, behenic acid ester, arachidonic acid ester, montanic acid ester, isostearic acid ester and the like.

  Examples of fatty acid polyhydric alcohol esters include glycerol tristearate, glycerol distearate, glycerol monostearate, pentaerythritol tetrastearate, pentaerythritol tristearate, pentaerythritol dimyristate, pentaerythritol Examples include tall monostearate, pentaerythritol adipate stearate, sorbitan monobehenate and the like. Examples of fatty acid polyglycol esters include polyethylene glycol fatty acid esters, polytrimethylene glycol fatty acid esters, and polypropylene glycol fatty acid esters.

  Examples of the modified silicone include polyether-modified silicone, higher fatty acid alkoxy-modified silicone, higher fatty acid-containing silicone, higher fatty acid ester-modified silicone, methacryl-modified silicone, and fluorine-modified silicone.

  Of these, fatty acid, fatty acid metal salt, oxy fatty acid, fatty acid ester, fatty acid partial saponified ester, paraffin, low molecular weight polyolefin, fatty acid amide, and alkylene bis fatty acid amide are preferred, and fatty acid partial saponified ester and alkylene bis fatty acid amide are more preferred. Of these, montanic acid ester, montanic acid partially saponified ester, polyethylene wax, acid value polyethylene wax, sorbitan fatty acid ester, erucic acid amide, and ethylene bisstearic acid amide are preferable, and particularly, montanic acid partially saponified ester and ethylene bisstearic acid amide are preferable. .

  A mold release agent may be used by 1 type and may be used in combination of 2 or more type. The content of the release agent is preferably 0.01 to 3 parts by weight, more preferably 0.03 to 2 parts by weight with respect to 100 parts by weight of polylactic acid.

<Antistatic agent>
The composition of the present invention may contain an antistatic agent. Examples of the antistatic agent include quaternary ammonium salt compounds such as (β-lauramidopropionyl) trimethylammonium sulfate and sodium dodecylbenzenesulfonate, sulfonate compounds, and alkyl phosphate compounds.

  One type of antistatic agent may be used, or two or more types may be used in combination. The content of the antistatic agent is preferably 0.05 to 5 parts by weight, more preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of polylactic acid (component A).

<Plasticizer>
The composition of the present invention may contain a plasticizer. Examples of the plasticizer include polyester plasticizers, glycerin plasticizers, polycarboxylic acid ester plasticizers, phosphate ester plasticizers, polyalkylene glycol plasticizers, and epoxy plasticizers.

  As a polyester plasticizer, acid components such as adipic acid, sebacic acid, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid and ethylene glycol, 1,3-propanediol, propylene glycol, 1,3-butanediol, Examples thereof include polyesters composed of diol components such as 1,4-butanediol, 1,6-hexanediol and diethylene glycol, and polyesters composed of hydroxycarboxylic acid such as polycaprolactone. These polyesters may be end-capped with a monofunctional carboxylic acid or a monofunctional alcohol.

  Examples of the glycerol plasticizer include glycerol monostearate, glycerol distearate, glycerol monoacetomonolaurate, glycerol monoacetomonostearate, glycerol diacetomonooleate, and glycerol monoacetomonomontanate.

  Polyvalent carboxylic acid plasticizers include dimethyl phthalate, diethyl phthalate, dibutyl phthalate, diheptyl phthalate, dibenzyl phthalate, butyl benzyl phthalate, trimellitic acid tributyl, trimellitic acid trioctyl, Trimellitic acid esters such as trihexyl meritate, isodecyl adipate, adipic acid esters such as adipate-n-decyl-n-octyl, citrate esters such as tributyl acetylcitrate, and bis (2-ethylhexyl) azelate Examples include sebacic acid esters such as azelaic acid ester, dibutyl sebacate, and bis (2-ethylhexyl) sebacate.

  Examples of the phosphate ester plasticizer include tributyl phosphate, tris phosphate (2-ethylhexyl), trioctyl phosphate, triphenyl phosphate, tricresyl phosphate, diphenyl-2-ethylhexyl phosphate, and the like.

  Polyalkylene glycol plasticizers such as polyethylene glycol, polytrimethylene glycol, polypropylene glycol, polytetramethylene glycol, poly (ethylene oxide / propylene oxide) block and / or random copolymer, ethylene oxide addition polymer of bisphenols, bisphenols Examples thereof include polyalkylene glycols such as tetrahydrofuran addition polymers, or end-capping compounds such as terminal epoxy-modified compounds, terminal ester-modified compounds, and terminal ether-modified compounds.

  Examples of the epoxy plasticizer include an epoxy triglyceride composed of alkyl epoxy stearate and soybean oil, and an epoxy resin using bisphenol A and epichlorohydrin as raw materials.

  Specific examples of other plasticizers include benzoic acid esters of aliphatic polyols such as neopentyl glycol dibenzoate, diethylene glycol dibenzoate, triethylene glycol-bis (2-ethylbutyrate), and fatty acids such as stearamide. Examples thereof include fatty acid esters such as amide and butyl oleate, oxyacid esters such as methyl acetylricinoleate and butyl acetylricinoleate, pentaerythritol, various sorbitols, polyacrylic acid esters, silicone oils, and paraffins.

  As the plasticizer, at least one selected from polyester-type plasticizers and polyalkylene-type plasticizers can be preferably used, and only one type may be used, or two or more types may be used in combination.

  The content of the plasticizer is preferably 0.01 to 30 parts by weight, more preferably 0.05 to 20 parts by weight, still more preferably 0.1 to 10 parts by weight per 100 parts by weight of polylactic acid (component A). is there. In the present invention, each of the crystallization nucleating agent and the plasticizer may be used alone, or more preferably used in combination.

<Others>
In the present invention, a phenolic resin, a melamine resin, a thermosetting polyester resin, a silicone resin, an epoxy resin or other thermosetting resin, a polyarylate resin, a liquid crystalline polyester resin, or a polyamide may be used without departing from the spirit of the present invention. Resin, polyimide resin, polyetherimide resin, polyphenylene ether resin, polyphenylene sulfide resin, polysulfone resin, polystyrene resin, acrylonitrile / styrene copolymer (AS resin), polystyrene resin, high impact polystyrene resin, syndiotactic polystyrene resin, etc. A thermoplastic resin may be included. Colorants containing organic and inorganic dyes and pigments, for example, oxides such as titanium dioxide, hydroxides such as alumina white, sulfides such as zinc sulfide, ferrocyanides such as bitumen, and chromium such as zinc chromate Contains acid salts, sulfates such as barium sulfate, carbonates such as calcium carbonate, silicates such as ultramarine, phosphates such as manganese violet, carbon such as carbon black, metal colorants such as bronze powder and aluminum powder, etc. You may let them. Also, nitroso type such as naphthol green B, nitro type such as naphthol yellow S, azo type such as naphthol red, chromophthal yellow, phthalocyanine type such as phthalocyanine blue and fast sky blue, and condensed polycyclic colorants such as indanthrone blue In addition, additives such as slidability improvers such as graphite and fluorine resin may be added. These additives can be used alone or in combination of two or more.

<About the manufacturing method of a resin composition>
i) Preparation of Coexisting Composition In the present invention, when a mixture of poly-L lactic acid resin (A-1 component) and poly-D lactic acid resin (A-2 component) is used as the polylactic acid resin (A component), other Before melt-mixing with the additive component of the phosphoric acid ester metal salt represented by formula (3) and / or formula (4), poly-L lactic acid resin (component A-1) and poly-D lactic acid resin (A -2 component) is preferably allowed to coexist in advance. As a method of coexistence, a method of mixing the poly-L lactic acid resin (A-1 component) and the poly-D lactic acid resin (A-2 component) as uniformly as possible, This is preferable because it can be generated efficiently. The coexisting composition can be prepared by any method as long as they are uniformly mixed when heat-treated. The method is carried out in the presence of a solvent, or the method is carried out in the absence of a solvent. Etc. are exemplified.

  Methods for preparing the coexisting composition in the presence of a solvent include a method of obtaining the coexisting composition by reprecipitation from a state dissolved in a solution, and a method of obtaining the coexisting composition by removing the solvent by heating. Preferably mentioned.

  In the case of obtaining such a coexisting composition by reprecipitation in the presence of a solvent, first, coexistence of a poly-L lactic acid resin (A-1 component) and a poly-D lactic acid resin (A-2 component) The composition is prepared by reprecipitation. Here, the A-1 component and the A-2 component are preferably carried out by adjusting and mixing separately dissolved solutions in a solvent, or by dissolving and mixing both in a solvent together. Here, the weight ratio (A-1 component / A-2 component) between the poly-L lactic acid resin (A-1 component) and the poly-D lactic acid resin (A-2 component) is 10/90 to 90 / It is preferable to prepare so that it may become the range of 10 in order to produce | generate the stereocomplex crystal | crystallization of polylactic acid (A-1 component, A-2 component) efficiently in the resin composition of this invention. The weight ratio of the A-1 component to the A-2 component is more preferably 25/75 to 75/25, particularly preferably 40/60 to 60/40. The solvent is not particularly limited as long as polylactic acid (A-1 component, A-2 component) can be dissolved. For example, chloroform, methylene chloride, dichloroethane, tetrachloroethane, phenol, tetrahydrofuran, N- Preferred are methylpyrrolidone, N, N-dimethylformamide, butyrolactone, trioxane, hexafluoroisopropanol, etc., alone or in combination.

  The phosphate ester metal salt represented by the formula (3) or the formula (4) is insoluble in the above solvent or may remain in the solvent after reprecipitation even when dissolved in the solvent. The polylactic acid (A-1 component, A-2 component) mixture obtained by the above and the phosphate ester metal salt represented by the formula (3) or formula (4) must be mixed separately to prepare a coexisting composition There is. The method of obtaining the coexisting composition of polylactic acid (A-1 component, A-2 component) mixture and the phosphoric acid ester metal salt represented by Formula (3) or Formula (4) is as long as they are uniformly mixed. It is not particularly limited, and any method such as powder mixing or melt mixing can be used.

  Next, by the method of removing the solvent from the presence of the solvent, polylactic acid (A-1 component, A-2 component) and the coexisting composition of the phosphate ester metal salt represented by formula (3) or formula (4) When the product is prepared at once, the A-1 component and the A-2 component, and the phosphoric acid ester metal salt represented by the formula (3) or the formula (4) are separately dissolved or dispersed in a solvent. This can be done by preparing and mixing the dispersion or by preparing and mixing a dispersion in which all components are dissolved or dispersed together in a solvent and then evaporating the solvent by heating. The solvent is not particularly limited as long as it dissolves polylactic acid (A-1 component, A-2 component) and the phosphate ester metal salt represented by formula (3) or formula (4). However, for example, chloroform, methylene chloride, dichloroethane, tetrachloroethane, phenol, tetrahydrofuran, N-methylpyrrolidone, N, N-dimethylformamide, butyrolactone, trioxane, hexafluoroisopropanol, or a mixture of two or more of them is preferable. The rate of temperature increase after evaporation of the solvent (heat treatment) is preferably, but not limited to, a short time since there is a possibility of decomposition when heat treatment is performed for a long time.

  The preparation of the coexisting composition of the polylactic acid resin (A-1 component, A-2 component) and the phosphoric acid ester metal salt represented by formula (3) or formula (4) can be performed even in the absence of a solvent. it can. That is, the A-1 component and the A-2 component, which have been powdered or chipped in advance, and the phosphoric acid ester metal salt represented by the formula (3) or the formula (4) are mixed in a predetermined amount and then melted and mixed. Or a method in which any one of the A-1 component and the A-2 component is melted and then the remaining components are added and mixed. Here, the size of the powder or chip is not particularly limited as long as the powder or chip of each polylactic acid unit (A-1 component, A-2 component) is uniformly mixed. The following is preferable, and the size is preferably 1 to 0.25 mm. When melting and mixing, a stereocomplex crystal is formed regardless of the size. However, when the powder or chip is simply melted after being uniformly mixed, if the diameter of the powder or chip becomes 3 mm or more, mixing is performed. Is not preferable, and homopolylactic acid crystals are likely to precipitate. In addition, as a mixing device used to uniformly mix the above powder or chips, in the case of mixing by melting, in addition to a reactor with a batch type stirring blade, a continuous reactor, a biaxial or uniaxial In the case of mixing with an extruder or powder, a tumbler type powder mixer, a continuous powder mixer, various milling devices, or the like can be suitably used.

Furthermore, when preparing such a coexisting composition, cyclic carbodiimide (B component), antioxidant (C component), terminal blocker (D component), hydrotalcite (E component), inorganic filler (F component) And other additives such as inorganic filler breakage inhibitors, lubricants, UV absorbers, light stabilizers, mold release agents, flow modifiers, colorants, light diffusing agents, fluorescent whitening agents, phosphorescent pigments, fluorescent Various additives such as dyes, antistatic agents, antibacterial agents, crystal nucleating agents, and plasticizers may be allowed to coexist.
In particular, the addition of cyclic carbodiimide (component B) and end-capping agent (component D) at the stage of preparation of the coexisting composition makes mixing of the end-capping agent and polylactic acid (component A) more uniform. In order to improve the hydrolysis resistance of the final resin composition obtained, the acidic end of polylactic acid is more effectively blocked. In addition, an antioxidant such as a hindered phenol compound, a phosphite compound, a phosphonite compound, or a thioether compound may be added at the stage of preparing the coexisting composition, or in the subsequent heat treatment stage of the coexisting composition. It is particularly preferable for improving the thermal stability.

ii) Heat treatment of coexisting composition In the present invention, when a mixture of poly-L lactic acid resin (A-1 component) and poly-D lactic acid resin (A-2 component) is used as polylactic acid resin (A component), other Before heat-mixing with the additive component, the coexisting composition of polylactic acid (A-1 component, A-2 component) and the phosphoric acid ester metal salt represented by formula (3) or formula (4) is heat-treated. Is preferred. Such heat treatment refers to holding the composition in a temperature range of 240 to 300 ° C. for a certain period of time. The temperature of the heat treatment is preferably 250 to 300 ° C, more preferably 260 to 290 ° C. If it exceeds 300 ° C., it is difficult to suppress the decomposition reaction, which is not preferable, and if it is less than 240 ° C., uniform mixing by heat treatment does not proceed, and stereocomplex crystals are not easily generated efficiently. The heat treatment time is not particularly limited, but is 0.2 to 60 minutes, preferably 1 to 20 minutes. As an atmosphere during the heat treatment, either an inert atmosphere at normal pressure or a reduced pressure can be applied. As the apparatus and method used for the heat treatment, any apparatus and method that can be heated while adjusting the atmosphere can be used. For example, a batch type reactor, a continuous type reactor, a biaxial or uniaxial type can be used. It is also possible to adopt a method of processing while forming using an extruder or the like, or a press machine or a flow tube type extruder. Here, the preparation of the coexisting composition of polylactic acid (A-1 component, A-2 component) and the phosphoric acid ester metal salt represented by formula (3) or formula (4) was conducted in the absence of a solvent. In the case of carrying out by the melt mixing method, heat treatment of the coexisting composition can be achieved simultaneously with the preparation of the coexisting composition.

iii) Preparation of Resin Composition The resin composition of the present invention comprises a polylactic acid resin (component A) (including the heat-treated coexisting composition), cyclic carbodiimide (component B), antioxidant (component C), terminal It is produced by mixing a blocking agent (D component), a hydrotalcite (E component), an inorganic filler (F component), and other additive components. (However, the components contained in the coexisting composition are excluded.)
Other additive components include inorganic filler breakage inhibitors, lubricants, UV absorbers, light stabilizers, mold release agents, flow modifiers, colorants, light diffusing agents, fluorescent whitening agents, phosphorescent pigments, fluorescent dyes And optional additive components such as antistatic agents, antibacterial agents, crystal nucleating agents, and plasticizers.

  In order to produce the resin composition of the present invention, any method is adopted. For example, a method of premixing polylactic acid resin (component A) and other components, then melt-kneading and pelletizing can be mentioned. Examples of the premixing means include a Nauter mixer, a V-type blender, a Henschel mixer, a mechanochemical apparatus, and an extrusion mixer. In the preliminary mixing, granulation can be performed by an extrusion granulator or a briquetting machine depending on the case. After the preliminary mixing, the mixture is melt-kneaded by a melt-kneader represented by a vent type twin-screw extruder and pelletized by a device such as a pelletizer. Other examples of the melt kneader include a Banbury mixer, a kneading roll, and a constant temperature stirring vessel, but a vent type twin screw extruder is preferred. In addition, each component can be independently supplied to a melt-kneader represented by a twin-screw extruder without being premixed.

<Manufacture of molded products>
The resin composition of the present invention is usually obtained as pellets produced by the above-described method, and products by various molding methods such as injection molding and extrusion molding can be produced using this as a raw material.
In the injection molding, not only a normal cold runner molding method but also a hot runner molding method is possible. In such injection molding, not only a normal molding method but also an injection compression molding, an injection press molding, a gas assist injection molding, a foam molding (including those by injection of a supercritical fluid), an insert molding, depending on the purpose as appropriate. A molded product can be obtained using an injection molding method such as in-mold coating molding, heat insulating mold molding, rapid heating / cooling mold molding, two-color molding, sandwich molding, and ultrahigh-speed injection molding. The advantages of these various molding methods are already widely known.

In extrusion molding, products such as various profile extrusion molded articles, sheets, and films can be obtained. For forming sheets and films, an inflation method, a calendar method, a casting method, or the like can also be used. It is also possible to form a heat-shrinkable tube by applying a specific stretching operation.
A hollow molded article can be obtained by subjecting the resin composition of the present invention to rotational molding or blow molding.

  The molded product formed by molding the resin composition of the present invention is suitable for, for example, an exterior material of electric / electronic parts, OA equipment, and home appliances. For example, a personal computer, a notebook computer, a game machine (home game machine, business use) Game machines, pachinko machines, slot machines, etc.), display devices (CRT, liquid crystal, plasma, projector, organic EL, etc.), mice, and exteriors such as printers, copiers, scanners, and fax machines (including these multifunction devices) Examples include switch molded products such as materials, electrical / electronic components, keyboard keys, and various switches. Furthermore, the molded article of the present invention is useful for a wide variety of other applications, such as portable information terminals (so-called PDAs), cellular phones, portable books (dictionaries, etc.), portable televisions, recording media (CD, MD, DVD, etc.) Generation high-density disk, hard disk, etc.) drive, recording media (IC card, smart media, memory stick, etc.) reader, optical camera, digital camera, parabolic antenna, electric tool, VTR, iron, hair dryer, rice cooker, electronics Electric and electronic equipment such as a range, sound equipment, lighting equipment, refrigerator, air conditioner, air cleaner, negative ion generator, and typewriter can be listed. The molded product of the present invention can be applied to various parts such as exterior materials. Can be applied. It is also suitable for various miscellaneous goods such as various containers, covers, writing instrument bodies, and ornaments. Further examples include vehicle parts such as lamp sockets, lamp reflectors, lamp housings, instrument panels, center console panels, deflector parts, car navigation parts, car audio visual parts, and auto mobile computer parts.

  Furthermore, the molded product formed by molding the resin composition of the present invention can be imparted with other functions by surface modification. Surface modification here means a new layer on the surface of resin molded products such as vapor deposition (physical vapor deposition, chemical vapor deposition, etc.), plating (electroplating, electroless plating, hot dipping, etc.), painting, coating, printing, etc. The method used for normal resin molded products can be applied.

  Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to these.

1. Manufacture of polylactic acid resin Polylactic acid resin was manufactured by the method shown in the following manufacture example. Moreover, each value in a manufacture example was calculated | required with the following method.
(1) Weight average molecular weight (Mw) and number average molecular weight (Mn) of the polymer
It was measured by gel permeation chromatography (GPC) and converted to standard polystyrene. The GPC measurement instrument used a differential refractometer Shimadzu RID-6A as a detector and Toso-TSKgel G3000HXL as a column. The measurement was performed by injecting 10 μl of a sample having a concentration of 1 mg / ml (chloroform containing 1% hexafluoroisopropanol) at a temperature of 40 ° C. and a flow rate of 1.0 ml / min using chloroform as an eluent.
(2) The carboxyl group concentration sample was dissolved in purified o-cresol in a nitrogen stream, and titrated with 0.05 N potassium hydroxide in ethanol using bromocresol blue as an indicator.
(3) Stereocomplex crystallinity DSC (TA-2920 manufactured by TA Instrument Co., Ltd.) Using the melting enthalpy derived from the polylactic acid resin (component A) crystal in the temperature rising process of measurement, stereocomplex from the following formula (1) The crystallinity parameter was evaluated.
Stereo complex crystallinity = ΔHms / (ΔHms + ΔHmh) × 100 (1)
[In the formula (1), ΔHmh and ΔHms are the melting enthalpy (ΔHmh) of the melting point of the crystal, which appears below 190 ° C. in the temperature rising process of the differential scanning calorimeter (DSC), respectively, and 190 ° C. or more and 250 It is the melting enthalpy (ΔHms) of the crystalline melting point that appears below ° C. ]
The ΔHmh and ΔHms were determined by measuring the resin composition using a differential scanning calorimeter (DSC) in a nitrogen atmosphere at a heating rate of 20 ° C./min.

In the examples and comparative examples of the present invention, the following materials were used.
[A-1 component: poly L-lactic acid resin (PLLA)]
[Production Example 1-1]
To 100 parts by weight of L-lactide (manufactured by Musashino Chemical Laboratory, Inc., optical purity 100%), 0.005 part by weight of tin octylate was added, and the reactor was stirred at 180 ° C. in a nitrogen atmosphere with a stirring blade. Then, 1.2 times equivalent of phosphoric acid was added to tin octylate, and then the remaining lactide was removed at 13.3 Pa to obtain chips, thereby obtaining a poly L-lactic acid resin.
The resulting poly L-lactic acid resin has a weight average molecular weight of 152,000, a melting enthalpy (ΔHmh) of 49 J / g, a melting point (Tmh) of 175 ° C., a glass transition point (Tg) of 55 ° C., and a carboxyl group content of 14 eq / ton.

[Component A-2: Production of poly-D-lactic acid resin (PDLA)]
[Production Example 1-2]
Poly D-lactic acid was prepared in the same manner as in Production Example 1-1 except that D-lactide (manufactured by Musashino Chemical Laboratory, Inc., optical purity 100%) was used instead of L-lactide in Production Example 1-1. A resin was obtained. The resulting poly-D-lactic acid resin has a weight average molecular weight of 151,000, a melting enthalpy (ΔHmh) of 48 J / g, a melting point (Tmh) of 175 ° C., a glass transition point (Tg) of 55 ° C., and a carboxyl group content of 15 eq / ton.

[Component A-3: Production of stereocomplex polylactic acid resin (scPLA)]
[Production Example 1-3]
100 parts by weight of polylactic acid resin composed of 50 parts by weight of PLLA and PDLA obtained in Production Examples 1-1 and 1-2 and phosphoric acid-2,2′-methylenebis (4,6-di-tert-butylphenyl) ) Sodium (ADK STAB NA-11: manufactured by ADEKA Co., Ltd.) 0.1 parts by weight was mixed with a blender, dried at 110 ° C. for 5 hours, and vented twin screw extruder with a diameter of 30 mmφ [manufactured by Nippon Steel Works, Ltd. TEX30XSST] was melt-extruded and pelletized at a cylinder temperature of 250 ° C., a screw rotation speed of 250 rpm, a discharge rate of 9 kg / h, and a vent vacuum of 3 kPa to obtain a polylactic acid resin 1. The resulting stereocomplex polylactic acid resin had a weight average molecular weight of 130,000, a melting enthalpy (ΔHms) of 56 J / g, a melting point (Tms) of 220 ° C., a glass transition point (Tg) of 58 ° C., and a carboxyl group content of 17 eq / The stereocomplex crystallinity calculated using ton and formula (1) was 100%.

  The results are summarized in Table 1. In Table 1, ΔHms is the melting enthalpy of the crystalline melting point appearing at 190 ° C. or higher and lower than 250 ° C., and ΔHmh is the melting enthalpy of the crystalline melting point appearing below 190 ° C. Tms is a crystalline melting point appearing at 190 ° C. or higher and lower than 250 ° C., and Tmh is a crystalline melting point appearing below 190 ° C.

2. Production of cyclic carbodiimide Cyclic carbodiimide was produced by the method shown in the following production examples. Moreover, each value in a manufacture example was calculated | required with the following method.
(1) Identification of cyclic carbodiimide structure by NMR Identification of the synthesized cyclic carbodiimide compound by NMR was confirmed by ¹ H-NMR and ¹³ C-NMR using JNR-EX270 manufactured by JEOL Ltd. In addition, deuterated chloroform was used as a solvent.
(2) Identification of carbodiimide skeleton of the cyclic carbodiimide compound identified synthesis by IR carbodiimide skeleton of the cyclic carbodiimide uses Nicolet Co. Magna-750, characteristic 2100～2200Cm ^-1 in FT-IR Accordingly carbodiimide This was done by confirming the absorption peak of.

In the examples of the present invention, the following materials were used.
[Component B-1: Production of cyclic carbodiimide (CC1)]
[Production Example 2-1]
Reaction in which 200 ml of o-nitrophenol (0.11 mol), 1,2-dibromoethane (0.05 mol), potassium carbonate (0.33 mol), and N, N-dimethylformamide (DMF) were installed with a stirrer and a heating device The apparatus was charged in an N ₂ atmosphere and reacted at 130 ° C. for 12 hours. After that, DMF was removed under reduced pressure, and the resulting solid was dissolved in 200 ml of dichloromethane and separated three times with 100 ml of water. The organic layer was dehydrated with 5 g of sodium sulfate, and dichloromethane was removed under reduced pressure to obtain an intermediate product A (nitro form).
Next, intermediate product A (0.1 mol), 5% palladium carbon (Pd / C) (1 g), and 200 ml of ethanol / dichloromethane (70/30) were charged into a reactor equipped with a stirrer, and 5 hydrogen substitution was performed. The reaction is performed in a state where hydrogen is constantly supplied at 25 ° C., and the reaction is terminated when there is no decrease in hydrogen. When Pd / C was recovered and the mixed solvent was removed, an intermediate product B (amine body) was obtained.

Next, in a reactor equipped with a stirrer, a heating device, and a dropping funnel, triphenylphosphine dibromide (0.11 mol) and 150 ml of 1,2-dichloroethane are charged and stirred in an N ₂ atmosphere. A solution prepared by dissolving intermediate product B (0.05 mol) and triethylamine (0.25 mol) in 50 ml of 1,2-dichloroethane is gradually added dropwise thereto at 25 ° C. After completion of dropping, the reaction is carried out at 70 ° C. for 5 hours. Thereafter, the reaction solution was filtered, and the filtrate was separated 5 times with 100 ml of water. The organic layer was dehydrated with 5 g of sodium sulfate, and 1,2-dichloroethane was removed under reduced pressure to obtain an intermediate product C (triphenylphosphine compound).
Next, in a reactor equipped with a stirrer and a dropping funnel, di-tert-butyl dicarbonate (0.11 mol), N, N-dimethyl-4-aminopyridine (0.055 mol), dichloromethane under N ₂ atmosphere. 150 ml was charged and stirred. Thereto, 100 ml of dichloromethane in which the intermediate product C (0.05 mol) was dissolved was slowly added dropwise at 25 ° C. After dropping, react for 12 hours. Then, CC1 was obtained by refine | purifying the solid substance obtained by removing dichloromethane. As a result of confirming the structure of CC1 by NMR and IR, it was a structure represented by the following formula.

[Component B-2: Production of cyclic carbodiimide (CC2)]
[Production Example 2-2]
o- nitrophenol (0.11 mol) and pentaerythrityl tetra bromide (0.025 mol), potassium carbonate (0.33mol), _N, N ₂ N- dimethylformamide 200ml in reactor installed with a stirrer and a heating device After charging in an atmosphere and reacting at 130 ° C. for 12 hours, DMF was removed under reduced pressure, and the resulting solid was dissolved in 200 ml of dichloromethane and separated three times with 100 ml of water. The organic layer was dehydrated with 5 g of sodium sulfate, and dichloromethane was removed under reduced pressure to obtain an intermediate product D (nitro form).
Next, intermediate product D (0.1 mol), 5% palladium carbon (Pd / C) (2 g), and 400 ml of ethanol / dichloromethane (70/30) were charged into a reactor equipped with a stirrer, and 5 hydrogen substitution was performed. The reaction was performed in a state where hydrogen was constantly supplied at 25 ° C., and the reaction was terminated when there was no decrease in hydrogen. When Pd / C was recovered and the mixed solvent was removed, an intermediate product E (amine body) was obtained.

Next, triphenylphosphine dibromide (0.11 mol) and 150 ml of 1,2-dichloroethane were charged and stirred in a reactor equipped with a stirrer, a heating device, and a dropping funnel in an N ₂ atmosphere. A solution prepared by dissolving the intermediate product E (0.025 mol) and triethylamine (0.25 mol) in 50 ml of 1,2-dichloroethane was gradually added dropwise thereto at 25 ° C. After completion of dropping, the reaction is carried out at 70 ° C. for 5 hours. Thereafter, the reaction solution was filtered, and the filtrate was separated 5 times with 100 ml of water. The organic layer was dehydrated with 5 g of sodium sulfate, and 1,2-dichloroethane was removed under reduced pressure to obtain an intermediate product F (triphenylphosphine compound).
Next, in a reactor equipped with a stirrer and a dropping funnel, di-tert-butyl dicarbonate (0.11 mol), N, N-dimethyl-4-aminopyridine (0.055 mol), and dichloromethane 150 ml under N2 atmosphere. Charge and stir. Thereto, 100 ml of dichloromethane in which the intermediate product F (0.025 mol) was dissolved was slowly added dropwise at 25 ° C. After dropping, react for 12 hours. Then, CC2 was obtained by refine | purifying the solid substance obtained by removing dichloromethane. As a result of confirming the structure of CC2 by NMR and IR, it was a structure represented by the following formula.

3. Production and Evaluation of Polylactic Acid Resin Pellets Resin composition pellets of polylactic acid resin (component A) and additives were produced by the methods shown in the following examples and comparative examples. Moreover, each value in an Example was calculated | required with the following method.
(1) Good or bad working environment During the extrusion / molding operation, sensory evaluation of whether the operator felt an irritating odor derived from isocyanate gas, and x when the irritating odor was felt, and ○ when no irritating odor was felt. did.
(2) Qualitative / Quantitative Determination of Isocyanate Gas by GC / MS The resin composition pellets were heated at 230 ° C. for 5 minutes and qualitatively / quantified by pyrolysis GC / MS analysis. In addition, fixed_quantity | quantitative_assay was performed using the analytical curve created with isocyanate. GC / MS used was GC / MS Jms Q1000GC K9 manufactured by JEOL Ltd.
(3) Hydrolysis resistance Using a polylactic acid resin composition, an injection molding machine (manufactured by Toshiba Machine Co., Ltd .: IS-150EN) at a cylinder temperature of 230 ° C and a mold temperature of 120 ° C, a thickness of 4 mm A molded piece for ISO measurement was prepared. Next, this molded piece was subjected to a wet heat treatment at 80 ° C. × 95% RH for 200 hours. In accordance with ISO527-1 and ISO527-2, a tensile test was performed, and the retention rate [(maximum tensile stress after wet heat treatment / before wet heat treatment) was determined from the maximum tensile stress before wet heat treatment and the maximum tensile stress after wet heat treatment. Maximum tensile stress) × 100] was calculated.

As other raw materials, the following were used.
<B 'component>
B′-1: Carbodilite LA-1 manufactured by Nisshinbo Co., Ltd. [Aliphatic polycarbodiimide]
B′-2: stabaxol-P [aromatic polycarbodiimide] manufactured by Rhein Chemie Japan
<C component>
C-1: Irganox 1076 [n-octadecyl-3- (3 ′, 5′-di-tert-butyl-4′-hydroxyphenyl) propionate] manufactured by Ciba Specialty Chemicals Co., Ltd.
C-2: Pade-24G manufactured by ADEKA Corporation [Bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite]
C-3: Sandstub P-EPQ [tetrakis (2,4-di-tert-butylphenyl) [1,1-biphenyl] -4,4′-diylbisphosphonite] manufactured by Clariant Japan Co., Ltd.
C-4: Adeka Co., Ltd. Adekastab AO-412S [3-laurylthiopropionate]
<D component>
D-1: ASF-4368CS manufactured by BASF Japan Ltd. [Epoxy group-containing acrylic-styrene copolymer]
D-2: BOX-210 [2,2- (1,3-phenylene) bis-2-oxazoline] manufactured by Takemoto Oil & Fat Co., Ltd.
<E component>
E-1: DHT-4A-2 [calcined hydrotalcite] manufactured by Kyowa Chemical Industry Co., Ltd.
<F component>
F-1: 3PE-937S manufactured by Nittobo Co., Ltd. (chopped strand having an average diameter of 13 μm and a cut length of 3 mm)

<Example 1>
Using the polylactic acid resin A-1 component produced in Production Example 1-1 as the polylactic acid resin, the composition shown in Table 2 was uniformly premixed by dry blending, and then this premixed mixture was supplied from the first supply port. , Melt extruded and pelletized. Here, the first supply port is a base supply port. The melt extrusion was carried out using a vent type twin screw extruder [TEX30XSST manufactured by Nippon Steel Works, Ltd.] with a diameter of 30 mmφ equipped with a side screw. The extrusion temperature is C1 / C2-C5 / C6 / C7-C11 / D = 10 ° C./240° C./230° C./220° C./220° C., the main screw rotation speed is 150 rpm, the side screw rotation speed is 50 rpm, The discharge rate was 20 kg / h, and the vent pressure reduction was 3 kPa.
The obtained pellets were dried with a hot air circulation dryer at 100 ° C. for 5 hours, molded with an injection molding machine (Toshiba Machine Co., Ltd .: IS-150EN), and evaluated. The results are shown in Table 2.

<Example 2>
Except having used the polylactic acid resin A-2 component manufactured by manufacture example 1-2 as a polylactic acid resin, it pelletized by the method similar to Example 1, and implemented the evaluation. The results are shown in Table 2.

<Examples 3 to 15 and Comparative Examples 1 to 10>
Except having used the polylactic acid resin A-3 component manufactured by manufacture example 1-3 as a polylactic acid resin, it pelletized by the method similar to Example 1, and implemented the evaluation. In the composition using F-2, after the composition excluding F-2 is uniformly premixed by dry blending, the premixture is supplied from the first supply port, and the F-2 component is supplied second. It was supplied from the mouth. Here, the second supply port is a supply port provided in the side screw. The results are shown in Tables 2-4. In the table, “impossible to measure hydrolysis resistance” means that the molded product did not retain its original shape after the wet heat treatment, and the tensile test could not be performed.

<Examples 1-17 and Comparative Examples 1-2, 8-9>
Examples 1 to 17 containing both the cyclic carbodiimide and the antioxidant had a good working environment, no generation of isocyanate gas, and were excellent in hydrolysis resistance, whereas only one of them was included. Comparative Examples 1-2 and Comparative Examples 8-9, which are not present, are significantly inferior in hydrolysis resistance.

<Comparative Examples 3-4>
If the amount of cyclic carbodiimide added or the amount of antioxidant added is too large, the hydrolysis resistance deteriorates.

<Comparative Examples 5-6>
In Comparative Examples 5 to 6 containing carbodiimide which is not cyclic carbodiimide, the working environment was deteriorated by an irritating odor, and generation of isocyanate gas was also observed from GC / MS.

<Comparative Example 7>
Comparative Example 7 containing only the antioxidant (C component) and the end-capping agent (D component) is significantly inferior in hydrolysis resistance.

Claims (12)

(A) 100 parts by weight of polylactic acid (component A) is represented by the following formula (1) in which (B) one carbodiimide group is present and the first nitrogen and the second nitrogen are bonded by a bonding group. 0.001 to 10 parts by weight of a compound (component B) containing 8 to 50 atoms forming the cyclic structure, and (C) a hindered phenol compound, a phosphite compound, a phosphonite system A composition containing 0.001 to 2 parts by weight of at least one antioxidant (component C) selected from the group consisting of a compound and a thioether compound.

(In the formula, Q is a divalent to tetravalent linking group represented by the following formula (1-1), (1-2) or (1-3)).

(In the formula, Ar ¹ and Ar ² are each independently an aromatic group having 2 to 4 carbon atoms and 5 to 15 carbon atoms. R ¹ and R ² are each independently 1 to 2 carbon atoms having 1 to 4 carbon atoms. 20 aliphatic groups, 2 to 4 valent alicyclic groups having 3 to 20 carbon atoms, and combinations thereof, or these aliphatic groups, alicyclic groups and 2 to 4 valent fragrances having 5 to 15 carbon atoms S is an integer of 0 to 10. k is an integer of 0 to 10. X ¹ and X ² are each independently a divalent to tetravalent C 1-20 aliphatic. A group, a divalent to tetravalent alicyclic group having 3 to 20 carbon atoms, a divalent to tetravalent aromatic group having 5 to 15 carbon atoms, or a combination thereof, and X ³ is a divalent to tetravalent carbon. These are an aliphatic group having 1 to 20 carbon atoms, an alicyclic group having 2 to 4 carbon atoms and 3 to 20 carbon atoms, an aromatic group having 2 to 4 carbon atoms and 5 to 15 carbon atoms, or a combination thereof. However, Ar ¹ , Ar ² , R ¹ , R ² , X ¹ , X ² and X ³ may contain a hetero atom, and when Q is a divalent linking group, Ar ¹ , Ar ² , R ¹ , R ² , X ¹ , X ² and X ³ are all divalent groups, and when Q is a trivalent linking group, Ar ¹ , Ar ² , R ¹ , R ² , One of X ¹ , X ² and X ³ is a trivalent group, and when Q is a tetravalent linking group, Ar ¹ , Ar ² , R ¹ , R ² , X ¹ , X ² and One of X ³ is a tetravalent group, or two are trivalent groups.) The composition according to claim 1, wherein Q in the formula (1) is a divalent linking group represented by the following formula (2-1), (2-2), or (2-3).

(In the formula, Ar _a ¹ and Ar _a ² are each independently a divalent aromatic group having 5 to 15 carbon atoms. R _a ¹ and R _a ² are each independently a divalent carbon atom having 1 to 2 carbon atoms. 20 aliphatic groups, divalent alicyclic groups having 3 to 20 carbon atoms, and combinations thereof, or combinations of these aliphatic groups, alicyclic groups and divalent aromatic groups having 5 to 15 carbon atoms in it .s _a is .k _a is each independently _.X ^{a 1} and _X ^{a 2} is an integer of 0 is an integer of 0, a divalent aliphatic group having 1 to 20 carbon atoms, It is a divalent alicyclic group having 3 to 20 carbon atoms, a divalent aromatic group having 5 to 15 carbon atoms, or a combination thereof, and X _a ³ is a divalent aliphatic group having 1 to 20 carbon atoms. group, a divalent alicyclic group having 3 to 20 carbon atoms, a divalent aromatic group having 5 to 15 carbon atoms, or combinations thereof. However, _Ar ^a 1, ^{_{r a 2, R a 1,}} R a 2, X a 1, X a 2 , and _X ^{a 3} may contain heteroatoms.) The composition according to claim 1, wherein the component B which is a compound containing a cyclic structure is a compound represented by the following formula (3).

(In the formula, Q _b is a trivalent linking group represented by the following formula (3-1), (3-2) or (3-3), Y is a carrier carrying a cyclic structure, A bond, a double bond, an atom, an atomic group or a polymer.)

(In the formula, Ar _b ¹ , Ar _b ² , R _b ¹ , R _b ² , X _b ¹ , X _b ² , X _b ³ , s _b and k _b are respectively represented by the formulas (1-1) to (1- 3) Ar ¹ , Ar ² , R ¹ , R ² , X ¹ , X ² , X ³ , s _b and k _b are the same, provided that one of them is a trivalent group.) The composition according to claim 1, wherein the component B which is a compound containing a cyclic structure is represented by the following formula (4).

(Wherein Q _c is a tetravalent linking group represented by the following formula (4-1), (4-2) or (4-3), and Z ¹ and Z ² carry a cyclic structure. A carrier, each independently a single bond, double bond, atom, atomic group or polymer.)

_{^{(Wherein, Ar c 1, Ar c 2}} , R c 1, R c 2, X c 1, X c 2, X c 3, s c and k _c are each formula (1-1) to (1- 3) ^is the same as ^{Ar 1, Ar 2, R 1} , R 2, X 1, X 2, X 3, s c and k _c. However, if one of these is a tetravalent group And two are trivalent groups.)   Including 100 parts by weight of polylactic acid (component A), 0.001 to 10 parts by weight of at least one terminal blocking agent (component D) selected from the group consisting of (D) an epoxy compound, an oxazoline compound and an oxazine compound The composition of any one of Claims 1-4.   The composition of any one of Claims 1-5 containing 0.01-0.3 weight part of (E) hydrotalcite (E component) with respect to 100 weight part of polylactic acid (A component).   Polylactic acid (component A) is composed of (A-1) poly-L lactic acid (A-1 component) mainly composed of L-lactic acid units and (A-2) poly-D lactic acid mainly composed of D-lactic acid units (A- The composition according to any one of claims 1 to 6, wherein the weight ratio of the component A-1 to the component A-2 is in the range of 10:90 to 90:10.   The poly-L lactic acid (component A-1) contains 90 mol% or more of L-lactic acid units, and the poly-D lactic acid (component A-2) contains 90 mol% or more of D-lactic acid units. Composition. The polylactic acid (component A) has a stereocomplex crystallinity represented by the following formula (5) of 80% or more using a melting enthalpy in a temperature rising process of differential scanning calorimetry (DSC) measurement: 9. The composition according to 8.
Stereo complex crystallinity = ΔHms / (ΔHms + ΔHmh) × 100 (5)
[In the formula (5), ΔHmh and ΔHms are the melting enthalpy (ΔHmh) of the melting point of the crystal that appears below 190 ° C. in the temperature rising process of the differential scanning calorimeter (DSC), respectively, and 190 ° C. or more and 250 It is the melting enthalpy (ΔHms) of the crystalline melting point that appears below ° C. ]   The molded article which consists of a composition of any one of Claims 1-9.   The molded article according to claim 10, which is molded by injection molding, extrusion molding, thermoforming, blow molding or foam molding.   The molded article according to claim 10 or 11, which is an automobile part, an electrical / electronic part, an electrical equipment exterior part, or an OA exterior part.