Resin composition having excellent transparency and molded product thereof

Abstract

To provide a resin composition which reduces the use ratio of raw materials derived from petroleum resources while maintaining characteristics such as transparency, heat resistance, mechanical properties and moldability inherent in the resin.SOLUTION: There is provided a resin composition having excellent transparency. The resin composition comprises a base resin including at least one kind of a styrene-based resin, a polycarbonate resin and an acrylic resin and a sugar derivative in which a fatty acid is ester-bonded to a hydroxyl group of a monosaccharide. And, the content of the base resin in the resin composition is more than 80 mass% and 97 mass% or less and the sugar derivative has a molecular weight of 300 g / mol or more and 2300 g / mol or less.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a resin composition having excellent transparency and a molded article formed from the resin composition.

Background Art

[0002] Regarding the biomass-derived technology of conventional transparent resins, the supply by the mass balance method via biomass naphtha has started. Although this technology has merits such as being able to be produced with existing equipment and having the same quality as that derived from fossil resources, it is difficult to expand the biomass mixing ratio due to concerns on the supply side. Therefore, it has also been proposed as a method for reducing the environmental load to provide a biomass-derived resin composition by mixing a biomass-derived resin as an additive with a petroleum-derived resin while maintaining mechanical properties and moldability.

[0003] As an example, Patent Document 1 discloses a styrene resin blended with polylactic acid having low environmental load and excellent impact resistance. Further, Patent Document 2 discloses a resin composition blended with a polysaccharide derivative having excellent heat resistance, hardness, etc., and Patent Document 3 discloses a styrene resin blended with a cellulose-based polysaccharide having excellent light transmittance, heat resistance, and appearance. Also, Patent Document 4 discloses a styrene resin blended with a biopolyester having excellent transparency and heat resistance, and Patent Document 5 discloses a styrene resin blended with a biomass-derived plasticizer such as vegetable oil, which is excellent in reducing environmental load and mold fouling.

[0004] Further, Patent Document 6 discloses a biopolycarbonate obtained by kneading polylactic acid, which is a biomass-derived resin, with a general-purpose polycarbonate, and Patent Document 7 discloses a biopolycarbonate in which conventional bisphenol A is replaced with a sugar-derived isosorbide-modified compound. Also, Patent Document 8 discloses a technique for producing methacrylic acid and / or its ester using microorganisms.

[0005] However, Patent Document 1 and Patent Document 2 contain resins that are incompatible with styrene-based resins, making it difficult to maintain high transparency. Patent Document 3 contains a large amount of powdered cellulose, so high transparency cannot be obtained. In Patent Document 4, the decomposition of polyester cannot be avoided, and high transparency cannot be obtained either. Patent Document 5 contains rubber-like particles, and it is not possible to obtain a styrene-based resin with high transparency. Also, since Patent Document 6 contains an incompatible resin, and Patent Document 7 introduces a biomass component into a polycarbonate resin and also introduces wood powder, high transparency cannot be obtained in each case. Patent Document 8 requires obtaining a highly pure acrylic resin raw material component derived from microorganisms, which is difficult and costly.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Patent Document 8

Summary of the Invention

Problems to be Solved by the Invention

[0007] To solve these problems, the inventors focused on sugars as biomass components and conducted intensive research. They found that modifying sugars with fatty acids and controlling the molecular size of the derivatives can improve transparency and other properties. Accordingly, the present invention provides a resin composition that solves the problem of reducing the usage ratio of petroleum resource-derived raw materials while maintaining the inherent transparency, heat resistance, mechanical properties, and moldability characteristics of the resin.

Means for Solving the Problems

[0008] This embodiment is a resin composition with excellent transparency. This resin composition contains (a) a base resin including at least one of a styrene resin, a polycarbonate resin, and an acrylic resin, and (b) a sugar derivative in which a fatty acid is ester-bonded to the hydroxyl group of a sugar. The content of the base resin in the resin composition is more than 80% by mass and 97% by mass or less, and the molecular weight of the sugar derivative is 300 g / mol or more and 2300 g / mol or less.

[0009] It is preferable that the sugar and / or fatty acid of the sugar derivative is derived from biomass. It is preferable that the sugar of the sugar derivative is xylose. Preferably, the molecular weight of the sugar derivative is 600 g / mol or more and 1200 g / mol or less. Moreover, in this embodiment, a molded article containing the above-described resin composition with excellent transparency is provided.

Effects of the Invention

[0010] The resin composition of the present invention can maintain the characteristics of transparency, heat resistance, mechanical properties, and moldability while reducing the usage ratio of petroleum resource-derived raw materials.

Modes for Carrying Out the Invention

[0011] <<Configuration of the Resin Composition>> The resin composition of the embodiment has: (a) a base resin containing at least one of a styrene resin, a polycarbonate resin, or an acrylic resin; and (b) a sugar derivative in which a fatty acid is ester-bonded to the hydroxyl group of a sugar. The content of (a) the base resin in the resin composition is more than 80% by mass and 97% by mass or less. If it is 80% by mass or less, high transparency cannot be obtained, and if it exceeds 97% by mass, a high biomass component ratio cannot be obtained. Further, the content of (a) the base resin in the resin composition is preferably more than 80% by mass and 95% by mass or less. Further, (a) the base resin is preferably 87% by mass or more and 93% by mass or less.

[0012] Regarding the tensile strength and tensile modulus of elasticity, which are the tensile properties of the resin composition, if appropriate conditions and composition are selected, the base resin can be made to exceed 80% by mass. When the base resin exceeds 80% by mass, when processed into a film or the like, sufficient strength can be obtained and processes such as stretching can be carried out.

[0013] Regarding the flexural strength and flexural modulus of elasticity, which are the bending properties of the resin composition, if appropriate conditions and composition are selected, the base resin can be made to exceed 80% by mass. When the base resin exceeds 80% by mass, when made into a molded product, the molded product retains sufficient rigidity and can be used for various applications. Therefore, the bending properties of the resin composition are preferably more than 80% of the base resin.

[0014] The MFR (melt flow rate) of the resin composition of the present embodiment can be 40 g / 10 min or less. When the MFR is 40 g / 10 min or less, it has sufficient fluidity for molding and retains sufficient hardness during kneading.

[0015] Regarding the heat distortion temperature of the resin composition of the present embodiment, if appropriate conditions and composition are selected, the base resin can be made to exceed 80% by mass. When the base resin exceeds 80% by mass, it retains sufficient heat resistance and can be applied to the same applications as the base resin.

[0016] If appropriate molding conditions and composition are selected, the resin composition of this embodiment can be a resin composition having a total light transmittance of 80% or more and 93% or less. The preferred range of the total light transmittance is 80% or more, and the more preferred range is 88% or more. If the total light transmittance is less than 80%, the target transparency of this embodiment cannot be achieved, and a total light transmittance exceeding 93% is a difficult value to achieve because reflected light is inevitable due to the measurement principle.

[0017] If appropriate molding conditions and composition are selected, the resin composition of this embodiment can be a resin composition having a haze of 0.1% or more and 10% or less. The preferred range of the haze is 5% or less, the more preferred range is 3% or less, and the even more preferred range is 1% or less. If the haze exceeds 10%, the target transparency of this embodiment cannot be achieved, and less than 0.1% is a difficult value to achieve due to the measurement principle.

[0018] <<Base resin>> <Styrene resin> The applicant first explains the styrene resin as the base resin of the resin composition. The styrene resin is obtained by polymerizing an aromatic vinyl compound-based monomer, and may copolymerize a vinyl-based monomer as needed, or may be rubber-modified by adding a conjugated diene-based rubber-like polymer. As the polymerization method, it can be produced by known methods, for example, bulk polymerization method, bulk / suspension two-stage polymerization method, solution polymerization method, etc.

[0019] As the aromatic vinyl compound monomer, known ones such as styrene, α-methylstyrene, α-methyl-p-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, vinyltoluene, ethylstyrene, isobutylstyrene, t-butylstyrene, bromostyrene, and indene can be used. Among these, styrene is preferably the main component. In addition, the above aromatic vinyl compound monomers other than styrene, acrylonitrile, (meth)acrylic acid, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, or cyclohexyl (meth)acrylate and other (meth)acrylic acid esters can be copolymerized within a range that does not impair the performance of the styrene-based resin of the present embodiment. Furthermore, in the present embodiment, a small amount of a crosslinking agent such as divinylbenzene may be added to the styrene-based resin and polymerized.

[0020] The conjugated diene rubber-like polymer used for the rubber modification of the styrene-based resin is polybutadiene, a random or block copolymer of styrene-butadiene, polyisoprene, polychloroprene, a random, block, or graft copolymer of styrene-isoprene, ethylene-propylene rubber, ethylene-propylene-diene rubber, etc. In particular, polybutadiene, a random, block, or graft copolymer of styrene-butadiene is preferred. Also, these may be partially hydrogenated.

[0021] The content of the conjugated diene rubber-like polymer contained in the styrene-based resin is preferably 10% by mass or less with respect to 100% by mass of the total amount of the styrene-based resin. By setting the content of the rubber-like polymer to 10% by mass or less, high fluidity of the styrene-based resin can be obtained. For having high transparency, it is more preferably 2% by mass or less. The average particle diameter of the conjugated diene rubber-like polymer contained in the styrene-based resin of the present embodiment is preferably 0.8 μm or more and 3.5 μm or less from the viewpoint of impact resistance.

[0022] Specific examples of such styrene resins include polystyrene (GPPS), high-impact polystyrene (HIPS), ABS resin (acrylonitrile-butadiene-styrene copolymer), AS resin (acrylonitrile-styrene copolymer), MS resin (methyl methacrylate-styrene copolymer), ASA resin (acrylonitrile-styrene-acrylic ester copolymer), AES resin (acrylonitrile-ethylene-propylene-styrene copolymer), MBS resin (methyl methacrylate-butadiene-styrene copolymer), and the like.

[0023] The weight-average molecular weight of the styrene polymer is preferably 100,000 or more and 300,000 or less, more preferably 120,000 or more and 250,000 or less, and even more preferably 140,000 or more and 200,000 or less. When the weight-average molecular weight is 100,000 or more and 300,000 or less, a resin with an excellent balance between mechanical properties and fluidity can be obtained, and the incorporation of gel-like substances is also less. The weight-average molecular weight is a value obtained by gel permeation chromatography in terms of standard polystyrene.

[0024] <Polycarbonate resin> The main component of the polycarbonate resin is an aromatic polycarbonate resin. A typical polycarbonate resin is obtained by reacting a dihydric phenol with a carbonate precursor. Methods for this reaction include the interfacial polycondensation method, the melt transesterification method, the solid-phase transesterification method of a carbonate prepolymer, and the ring-opening polymerization method of a cyclic carbonate compound, and the like.

[0025] Examples of the dihydric phenols include hydroquinone, resorcinol, 4,4'-biphenol, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)propane (common name: bisphenol A), 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 2,2-bis(4-hydroxyphenyl)pentane, 4,4'-(p-phenylenediisopropylidene)diphenol, 4,4'-(m-phenylenediisopropylidene)diphenol, 1,1-bis(4-hydroxyphenyl)-4-isopropylcyclohexane, bis(4-hydroxyphenyl)oxide, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)ketone, bis(4-hydroxyphenyl)ester, 2,2-bis(3,5-dibromo-4-hydroxyphenyl)propane, bis(3,5-dibromo-4-hydroxyphenyl)sulfone, bis(4-hydroxy-3-methylphenyl)sulfide, 9,9-bis(4-hydroxyphenyl)fluorene, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, and isosorbide, isomannide, isoidide, etc. Examples of the cyclic dihydroxy compounds include 3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro(5.5)undecane (common name: spiroglycol), 3,9-bis(1,1-diethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro(5.5)undecane, 3,9-bis(1,1-dipropyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro(5.5)undecane, etc. Among these, bis(4-hydroxyphenyl)alkane, particularly bisphenol A, is preferred.In addition, cyclic anhydrosugar alcohols that can be produced from sugars as biomass-derived raw materials, particularly isosorbide, can be produced inexpensively by subjecting D-glucose obtained from starch to a hydrogenation reaction or a dehydration reaction.

[0026] In addition, as part or all of the dihydric phenol component, a polycarbonate polymerized from at least one of 4,4'-(m-phenylenediisopropylidene)diphenol, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 9,9-bis(4-hydroxyphenyl)fluorene, and 9,9-bis(4-hydroxy-3-methylphenyl)fluorene is suitable for applications where particularly strict requirements are placed on dimensional changes due to water absorption and morphological stability. In this case, these dihydric phenols other than bisphenol A are preferably used in an amount of 5 mol% or more, particularly 10 mol% or more, based on the total amount of the dihydric phenol component constituting the polycarbonate.

[0027] Also, as a small amount of polyhydric phenol component, 1,1,1-tris(4-hydroxyphenyl)ethane, 1,1,1-tris(3,5-dimethyl-4-hydroxyphenyl)ethane, etc. can be used.

[0028] Among polycarbonate resins, those having a water absorption rate of 0.05 mass% or more and 0.15 mass% or less and a glass transition temperature of 120°C or more and 250°C or less, obtained by adjusting the copolymer composition, etc., have good hydrolysis resistance of the polymer itself and excellent low warpage properties after molding, and are therefore particularly suitable in fields where morphological stability is required.

[0029] As the carbonate precursor, carbonyl halide, carbonate ester, dihaloformate, etc. are used. Specifically, phosgene, diphenyl carbonate, ditolyl carbonate, bis(chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis(biphenyl) carbonate, diethyl carbonate, dimethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate, etc. are included. Particularly, diphenyl carbonate is preferable.

[0030] The polycarbonate resin may be used together with the above-mentioned dihydric phenol and carbonate precursor, and a catalyst, a terminal stopper, an antioxidant for preventing oxidation of the dihydric phenol, etc. as necessary. The polycarbonate resin is produced by a known production method such as an interfacial polymerization method, a melt transesterification polymerization method, a solid-phase transesterification method of a carbonate prepolymer, and a ring-opening polymerization method of a cyclic carbonate compound.

[0031] The polycarbonate resin may be a polyester carbonate copolymerized with an aromatic or aliphatic (including alicyclic) difunctional carboxylic acid, a copolymerized polycarbonate copolymerized with a difunctional alcohol (including alicyclic), and a polyester carbonate copolymerized with both such a difunctional carboxylic acid and a difunctional alcohol. Also, a mixture of two or more of the obtained polycarbonates may be used. The polycarbonate resin can also be one that uses unnecessary parts during production or product processing, or one that has been reused after product use.

[0032] As the aliphatic difunctional carboxylic acid, α,ω-dicarboxylic acid is preferable. The aliphatic difunctional carboxylic acid is preferably, for example, a linear saturated aliphatic dicarboxylic acid such as sebacic acid (decanedioic acid), dodecanedioic acid, tetradecanedioic acid, octadecanedioic acid, eicosanedioic acid, and an alicyclic dicarboxylic acid such as cyclohexanedicarboxylic acid. The difunctional alcohol is more preferably an alicyclic diol and includes, for example, cyclohexanedimethanol, cyclohexanediol, tricyclodecanedimethanol, etc.

[0033] Furthermore, as the polycarbonate resin, it is also possible to use a polycarbonate-polyorganosiloxane copolymer obtained by copolymerizing polyorganosiloxane units.

[0034] The viscosity average molecular weight of the polycarbonate resin is not limited, but preferably ranges from 11,000 or more to 35,000 or less. By setting it to 11,000 or more, sufficient strength can be obtained, and by setting it to 35,000 or less, the molding processability becomes good. In that sense, the range of 15,000 or more to 25,000 or less for the viscosity average molecular weight is more preferable.

[0035] <Acrylic resin> The main component of the acrylic resin as the base resin of the present embodiment is a repeating unit derived from methyl methacrylate, and it is preferably 85% by mass or more and 99% by mass or less in 100% by mass of the acrylic resin. When the repeating unit derived from methyl methacrylate is 85% by mass or more, the acrylic resin is excellent in mechanical properties and heat resistance, and when it is 99% by mass or less, the acrylic resin is excellent in thermal stability.

[0036] The acrylic resin preferably contains 1% by mass or more and 10% by mass or less of a repeating unit derived from an alkyl acrylate in 100% by mass of the acrylic resin. When the repeating unit derived from the alkyl acrylate is 1% by mass or more, the acrylic resin is excellent in thermal stability, and when it is 10% by mass or less, the acrylic resin is excellent in mechanical properties and heat resistance.

[0037] Alkyl acrylates include, for example, methyl acrylate, ethyl acrylate, n-propyl acrylate, iso-propyl acrylate, n-butyl acrylate, iso-butyl acrylate, sec-butyl acrylate, tert-butyl acrylate, n-hexyl acrylate, cyclohexyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, and the like. These alkyl acrylates may be used alone or in combination of two or more. Among these alkyl acrylates, methyl acrylate and ethyl acrylate are preferred, and methyl acrylate is more preferred because the production cost of the acrylic resin can be suppressed.

[0038] In addition, the acrylic resin may be copolymerized with repeating units other than methyl methacrylate and alkyl acrylate as long as the original performance of the acrylic resin is not impaired. Copolymerizable monomers include (meth)acrylate compounds, (meth)acrylamide compounds, aromatic vinyl compounds, vinyl ether compounds, vinyl carboxylate compounds, olefin compounds, and the like. These monomers may be used alone or in combination of two or more.

[0039] (Meth)acrylate compounds include ethyl methacrylate, n-propyl methacrylate, iso-propyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, sec-butyl methacrylate, tert-butyl methacrylate, n-hexyl methacrylate, cyclohexyl methacrylate, n-octyl methacrylate, 2-ethylhexyl methacrylate, phenyl (meth)acrylate, bornyl (meth)acrylate, norbornyl (meth)acrylate, isobornyl (meth)acrylate, adamantyl (meth)acrylate, glycidyl (meth)acrylate, etc. (Meth)acrylamide compounds include (meth)acrylic acid, (meth)acrylonitrile, (meth)acrylamide, N-dimethyl (meth)acrylamide, N-diethyl (meth)acrylamide, N-butyl (meth)acrylamide, dimethylaminopropyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methoxymethyl (meth)acrylamide, N-butoxymethyl (meth)acrylamide, hydroxyethyl (meth)acrylamide, methylenebis(meth)acrylamide, etc. Aromatic vinyl compounds include styrene, α-methylstyrene, etc., vinyl ether compounds include methyl vinyl ether, ethyl vinyl ether, 2-hydroxyethyl vinyl ether, etc., vinyl carboxylate compounds include vinyl acetate, vinyl butyrate, etc., and olefin compounds include ethylene, propylene, butene, isobutene, etc.

[0040] Examples of the polymerization method of the acrylic resin include bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, etc. Among these polymerization methods, bulk polymerization, solution polymerization, and suspension polymerization are preferred because no emulsifier is required and the acrylic resin has excellent optical properties. Bulk polymerization is more preferred, and continuous bulk polymerization is even more preferred because it has excellent productivity and can suppress the mixing of foreign substances.

[0041] In any polymerization, polymerization is initiated using a small amount of a polymerization initiator. Examples of the polymerization initiator include organic peroxides and azo compounds. Organic peroxides include, for example, tert-butyl peroxy-3,5,5-trimethylhexanoate, tert-butyl peroxylaurate, tert-butyl peroxyisopropyl monocarbonate, tert-hexyl peroxyisopropyl monocarbonate, tert-butyl peroxyacetate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-butylperoxy)cyclohexane, tert-butyl peroxy 2-ethylhexanoate, tert-butyl peroxyisobutyrate, tert-hexyl peroxy 2-ethylhexanoate, di-tert-butyl peroxide, di-tert-hexyl peroxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, and the like. Azo compounds include 2-(carbamoylazo)-isobutyronitrile, 1,1'-azobis(1-cyclohexanecarbonitrile), 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), dimethyl 2,2'-azobisisobutyrate, 2,2'-azobis(2,4,4-trimethylpentane), 2,2'-azobis(2-methylpropane), and the like. These polymerization initiators may be used alone or in combination of two or more. Among these polymerization initiators, organic peroxides are preferred because the production cost can be suppressed, and tert-butyl peroxy-3,5,5-trimethylhexanoate and di-tert-butyl peroxide are more preferred.

[0042] The amount of the polymerization initiator used is preferably 0.001% by mass or more and 1% by mass or less, more preferably 0.005% by mass or more and 0.1% by mass or less, based on 100% by mass of all monomers, since a desired mass average molecular weight can be obtained. When the amount of the polymerization initiator used is 0.001% by mass or more, the polymerization rate of the monomer is excellent. Also, when the amount of the polymerization initiator used is 1% by mass or less, the production cost can be suppressed.

[0043] In addition, it is desirable to use a chain transfer agent in the polymerization reaction system to control the molecular weight and molecular weight distribution. Examples of the chain transfer agent include mercaptan compounds. These chain transfer agents may be used alone or in combination of two or more. Among these chain transfer agents, mercaptan compounds are preferred because the production cost can be suppressed.

[0044] Examples of the mercaptan compound include primary, secondary, and tertiary mercaptans having an alkyl group or substituted alkyl group such as n-butyl, iso-butyl, sec-butyl, tert-butyl, n-octyl, n-dodecyl, sec-dodecyl, etc., aromatic mercaptans such as phenyl mercaptan, thiocresol, 4-tert-butyl-o-thiocresol, mercaptans having 2 to 18 carbon atoms such as thioglycolic acid and its esters, and ethylene thioglycol. These mercaptan compounds may be used alone or in combination of two or more. Among these mercaptan compounds, n-butyl mercaptan, tert-butyl mercaptan, n-octyl mercaptan, and n-dodecyl mercaptan are preferred, and n-butyl mercaptan and n-octyl mercaptan are more preferred because the production cost can be suppressed.

[0045] The amount of the chain transfer agent used is preferably 0.01% by mass or more and 2% by mass or less, more preferably 0.05% by mass or more and 1% by mass or less, based on 100% by mass of all monomers, since a desired mass average molecular weight can be obtained. When the amount of the chain transfer agent used is 0.01% by mass or more, the polymerization stability of the monomer is excellent. In addition, when the amount of the chain transfer agent used is 2% by mass or less, the production cost can be suppressed.

[0046] The weight average molecular weight of the acrylic resin is preferably 30,000 or more and 70,000 or less. When the weight average molecular weight of the acrylic resin is 30,000 or more, the mechanical properties of the acrylic resin are excellent, and when it is 70,000 or less, the moldability of the acrylic resin is excellent. The molecular weight distribution of the acrylic resin is preferably 2.0 or more and 4.0 or less, and more preferably 2.4 or more and 3.6 or less. When the molecular weight distribution of the acrylic resin is 2.0 or more, the moldability of the acrylic resin is excellent, and when it is 4.0 or less, the flow stability of the acrylic resin is excellent.

[0047] <<Sugar derivative>> The (b) sugar derivative of the present embodiment is one in which a fatty acid is ester-bonded to the hydroxyl group of the sugar.

[0048] The molecular weight of the (b) sugar derivative of the present embodiment is 300 g / mol or more and 2300 g / mol or less. When the sugar of the raw material is a monosaccharide or a disaccharide and the structure is clear, the molecular weight of the structure in which fatty acids are ester-bonded to all the hydroxyl groups of the sugar is taken as the molecular weight of the sugar derivative. For trisaccharides or higher, oligosaccharides, or sugar derivatives with low fatty acid purity or incomplete derivatization, absolute molecular weight measurement is followed. As a means of absolute molecular weight measurement, GPC-MALS-RI was used to determine the weight average molecular weight.

[0049] When the molecular weight is less than 300 g / mol, hydroxyl groups remain in the (b) sugar derivative, resulting in a decrease in plasticity and compatibility with the (a) base resin, and it becomes impossible to mold. When the molecular weight exceeds 2300 g / mol, the volume of the molecule increases and it is affected by visible light, which affects the transmittance. Considering the availability of biomass-derived raw materials and mechanical properties, the molecular weight is preferably 600 g / mol or more and 1200 g / mol or less.

[0050] The content of the (b) sugar derivative in the resin composition of the present embodiment is 3% by mass or more and 20% by mass or less. If it is less than 3% by mass, a high biomass component ratio cannot be obtained, and if it exceeds 20% by mass, high transparency cannot be obtained. In that sense, the content of the (b) sugar derivative in the resin composition is preferably 7% by mass or more and 13% by mass or less.

[0051] <Monosaccharides, oligosaccharides, polysaccharides> The sugar in this embodiment refers to monosaccharides, oligosaccharides formed by the combination of a plurality of monosaccharides, or polysaccharides. A monosaccharide refers to a saccharide that cannot be hydrolyzed further. Monosaccharides exist in two forms: a linear structure and a cyclic structure, but most often take the cyclic structure. When taking the linear structure, it is usually a polyhydric alcohol having an aldehyde group or a ketone group. A monosaccharide containing an aldehyde group is called an aldose, and a monosaccharide having a ketone group is called a ketose. Furthermore, when these carbonyl groups are reduced, they become sugar alcohols, which also have a linear structure.

[0052] Examples of monosaccharides include hexoses such as glucose, mannose, galactose, fructose, glucuronic acid, and galacturonic acid, and pentoses such as xylose, arabinose, ribose, lyxose, ribulose, xylulose, and deoxyribose. In addition, there are rare sugars represented by xylitol, erythritol, psicose, allose, sorbose, tagatose, talose, idose, and glyceraldehyde; trioses consisting only of dihydroxyacetone; tetroses consisting of erythrose, threose, erythrulose, etc.; and heptoses consisting of sedoheptulose and colioses. However, it is not limited to these.

[0053] Examples of oligosaccharides include disaccharides such as lactose (where galactose and glucose are linked), sucrose (where glucose and fructose are linked), and also maltose, cellobiose, xylobiose, arabinobiose, lactitol, gentiobiose, mannobios, trehalose, lactulose, melibiose ( planteobiose), melibiurolose, rutinose, rutinurolose, primeverose, bicinose, nigerose, laminaribiose, turanose, kojibiose, sophorose; trisaccharides such as cellotriose, xylotriose, arabinotriose, raffinose, gentianose, melezitose, planteose, maltotriose, panose; tetrasaccharides such as cellotetraose, xylotetraose, arabinotetraose, stachyose, verbascose. Furthermore, various oligosaccharides formed by the linkage of several monosaccharides are also included, such as cellooligosaccharides with β-(1→4) linked glucose, maltooligosaccharides with α-(1→4) linked glucose, isomaltooligosaccharides with a structure composed of three α-(1→6) linked glucoses and containing α-(1→4) linkages in part of the structure, xylooligosaccharides with β-(1→4) linked xylose, α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin where glucose is cyclically linked by α-(1→4) glycosidic bonds in 6 - 8 units, dextrin, nigerooligosaccharides, gentiooligosaccharides, galactooligosaccharides, fructooligosaccharides. However, it is not limited to these.

[0054] Examples of polysaccharides include amylose, in which a large number of glucose molecules, which are components of plant starch, are polymerized by α-(1→4) glycosidic bonds to form a linear structure; amylopectin, in which a large number of glucose molecules are polymerized by α-(1→4) and α-(1→6) glycosidic bonds to form a highly branched structure; glycogen, which is called animal starch and has an even more branched structure than amylopectin; cellulose, in which glucose molecules are polymerized by β-(1→4) bonds; xylan, in which xylose is β-(1→4) glycosidically bonded; carrageenan, in which glucose is β-(1→3) glycosidically bonded, and the like. In addition, there are also xyloglucan, arabinoxyloglucan, arabinogalactan, curdlan, schizophyllan, laminarin, lentinan, paramylon, pullulan, pectin, fructan, inulin, levan, galactan, mannan, galactomannan, glucomannan, guar gum, xanthan gum, alginic acid, fucoidan, porphyran, carrageenan, chitin, protuberic acid, colominic acid, agarose, agaropectin, etc. existing as polysaccharides. However, it is not limited to these. However, due to the above-mentioned molecular weight limitations, high molecular weight polysaccharides such as starch, amylose, amylopectin, cellulose, hemicellulose, glucomannan, etc. may not be included.

[0055] Xylose, glucose, etc. are preferably used because sugars as biomass can be easily obtained by extracting from biomass-derived raw materials and decomposing and purifying them by enzymatic or chemical treatment. Also, the transparency is related to the reflection of visible light, and as the molecular weight or the concentration of sugar derivatives in the system increases, the reflection of visible light occurs, so it is important to adjust the molecular weight. Therefore, xylose, which has fewer hydroxyl groups and fewer reaction sites, is more preferable.

[0056] <Fatty acid> A fatty acid refers to a monocarboxylic acid having a carboxy group at the end of a hydrocarbon chain. The hydrocarbon chain may be straight-chain or branched, and may be a saturated fatty acid having no unsaturated bonds such as double bonds or triple bonds in the hydrocarbon chain, or an unsaturated fatty acid having unsaturated bonds in the hydrocarbon chain, and the number of unsaturated bonds is also not limited. Examples include formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, caproic acid, enanthic acid, caprylic acid, 2-ethylhexanoic acid, pelargonic acid, capric acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, isopalmitic acid, palmitoleic acid, margaric acid, stearic acid, isostearic acid, oleic acid, vaccenic acid, linoleic acid, linolenic acid, eicosapentaenoic acid, docosahexaenoic acid, eleostearic acid, arachidic acid, eicosadienoic acid, mead acid, arachidonic acid, behenic acid, lignoceric acid, nervonic acid, cerotic acid, montanic acid, melissic acid. However, it is not limited to these.

[0057] (b) The fatty acid that is a raw material for the sugar derivative is preferably a biomass-derived raw material. These fatty acids may be directly isolated from biomass-derived raw materials or semi-synthesized using compounds isolated from biomass-derived raw materials as starting materials. Particularly, from the viewpoint of easy availability, the fatty acid preferably has 8 to 18 carbon atoms, more preferably 12 to 16 carbon atoms.

[0058] <<Manufacturing method>> <Method for manufacturing sugar derivative> In the synthesis of sugar derivatives, in the case of esterification, acid halides, acid anhydrides, carboxylic acids, carboxylic acid esters, ketones, aldehydes, alcohols, etc. are used. The above compounds may be those directly isolated from natural products, those semi-synthesized using the isolated ones as starting materials, or synthetic products. However, from the perspective of reducing environmental impact, it is preferable that the carbon atoms constituting the compound are derived from natural products. Either an aqueous solvent system or an organic solvent system may be used as the solvent. Examples of the organic solvent system include pyridine, acetone, ethyl acetate, N,N-dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, chloroform, dichloromethane, etc. In particular, pyridine is preferable because it is basic and can trap acids. In the synthesis, an organic acid, an organic base, an inorganic acid, an inorganic base, a metal catalyst, etc. may be added to the reaction system for the purpose of starting the reaction or promoting the reaction. In the case of esterification, acid chlorides, acid anhydrides, and carboxylic acid esters are preferable as those used in the synthesis. Acid chlorides are most preferable in terms of the ease of obtaining raw materials, the synthesis of raw materials, and the ease of reaction during derivatization.

[0059] <Method for producing resin composition> The method for producing a resin composition is, for example, produced by (a) weighing a base resin, (b) a sugar derivative, and, if necessary, a third component in a predetermined ratio and melt-kneading them under heating.

[0060] As a method of melt-kneading, for example, it can be carried out by using a single-screw extruder, a twin-screw kneading extruder, a multi-screw kneading extruder, etc. The kneading temperature is usually appropriately selected in the range of 100°C or higher and 300°C or lower, preferably in the range of 150°C or higher and 250°C or lower, more preferably in the range of 180°C or higher and 230°C or lower. Before melt-kneading, (a) the base resin, (b) the sugar derivative, and, if necessary, the third component may be preliminarily mixed by a conventional method in the form of powder or pellets.

[0061] A third component can be blended into the resin composition as needed. Examples of such a third component include additives conventionally used for plastics such as plasticizers, dispersants, antioxidants, antibacterial agents, compatibilizers, lubricants, processing aids, mold release agents, stabilizers, flame retardants, transparency improvers, yellowing inhibitors, ultraviolet absorbers, antistatic agents, antifogging agents, pigments, dyes, and fluorescent dyes.

[0062] The resin composition can be in the form of a lump, plate, film, thread, string, pellet, powder, particle, or any other molded product. From the viewpoints of storage, distribution, etc., the form is preferably in the form of pellets. The shape of the pellets can be any of a cylindrical shape, an elliptical cylindrical shape, a flat plate shape, a spherical shape, an ellipsoidal shape, etc. For example, a cylindrical shape with a diameter of 0.5 mm or more and 5 mm or less and a length of 0.5 mm or more and 10 mm or less is exemplified.

[0063] (a) The base resin and (b) the sugar derivative are preferably finely dispersed in the composition to a size sufficiently smaller than the visible light wavelength so as to improve transparency. To achieve fine dispersion, methods such as pulverization of the sugar derivative or the base resin before kneading, uniform mixing before kneading using a blender, in a single-screw kneader, arranging kneading elements, in a twin-screw kneader, dynamic mixing by high-shear and high-elongation flow using a kneading block or an elongation kneading element, static mixing using a static mixer, and passing through a high-mesh filter are preferred. At this time, attention must be paid to the deterioration and quality degradation of the resin composition. Whether it is dispersed to a size sufficiently smaller than the visible light wavelength can be determined by observing the optical uniformity of the molded product with the naked eye, measuring the total light transmittance, and haze.

[0064] <Method for manufacturing a molded product> A resin composition with excellent transparency is preferably made into a molded article containing at least a part of it. Since the resin composition of this embodiment is thermoplastic, it can be processed into a molded article of a desired shape by heating it to melt, fluidize, or soften, and then putting it into a mold and compressing it, or extruding it. The melting and molding temperature is usually 200°C or higher and 230°C or lower, but it is not limited to this.

[0065] As a molding method of the molded article, for example, injection molding, extrusion molding, casting, calender molding, slush molding, blow molding, vacuum molding, powder molding, foam molding, extrusion lamination molding, T-die molding, air-cooled inflation molding, water-cooled inflation molding, microwave molding which is a kind of photoforming that heats the mold with radiation, and the like can be mentioned. Also, it can be made into a molded article by deforming (molding) using its own weight without using a mold, or applying an external force using tools.

[0066] The molded article can be molded into various shapes such as films, thin plates, thick plates, corrugated plates, threads, filaments, rods, pipes, columns, shaped objects, artworks, etc. Also, since the resin composition has excellent heat resistance, mechanical properties, and molding processability, its molded articles can be widely used for windows such as those in transparent buildings, indoor and outdoor of vehicles, and partitions between rooms, partition boards, aquariums, window glasses such as carport ceilings, lighting fixtures, flat panel displays, mobile phones, headlight covers of automobiles, signboards, showcases, coverings such as watch covers, lighting lenses, optical lenses, lenses such as glasses and sunglasses, sheets such as blisters and carrier tapes, and other daily necessities and decorations such as ceiling materials, ballpoint pens, and cups.

Examples

[0067] <Synthesis of sugar derivatives> The synthesis of sugar derivatives used in Examples 1 to 8 and Comparative Examples 1 to 2 will be described. The selected raw material sugars were obtained by reacting with fatty acid halides dissolved in pyridine or reacting with acid anhydrides. For example, palmitoylated xylose was obtained by dropping palmitoyl chloride into xylose in a pyridine solvent and reacting. For acetylated xylose, xylose was mixed with acetic anhydride, sodium acetate was added, and the mixture was heated and stirred to react. Thereafter, by liquid separation operation, the reactant dissolved in the organic layer was dropped into methanol or hexane, precipitated, filtered, and the filtrate was dried with a vacuum dryer. Note that all raw material fatty acids used were derived from biomass.

[0068] <Manufacture of Resin Composition> A sugar derivative was mixed with a predetermined transparent resin in a predetermined mass ratio and thoroughly mixed with a blender or the like. Then, it was kneaded at 200 to 230 °C using a twin-screw extruder (KZW25TW-45MG-NH300 manufactured by TECHNOVEL), and the filament was cut with a pelletizer (FCMini-4SN / 55SW1 / C manufactured by Hoshi Plastics) to obtain pellets of the resin composition. The pellets of Examples 1 - 8 and Comparative Examples 1 - 2 were cylindrical with a diameter of 2 - 5 mm and a length of 5 - 7 mm.

[0069] <Preparation of Test Specimens for Physical Property Evaluation> Pellets of the resin composition were used to create a flat plate of 40 mm × 40 mm × 1 mm, a strip test specimen of 80 mm × 10 mm × t2 mm, and a dumbbell of 5A size at 210 °C using a small molding machine (C Mobile-0813 manufactured by Epson Techform) for evaluation. Note that the surface of the mold for the test specimen was preferably mirror-polished using abrasive paper, fixed abrasive grains, free abrasive grains, etc. as appropriate. The injection molding machine was thoroughly cleaned.

[0070] <Measurement and Evaluation Methods> (1) Molecular Weight of Sugar Derivative When the raw material sugar is a monosaccharide or a disaccharide, and the structures of the raw material sugar and fatty acid are clear (evaluating the chemical structure by NMR etc. as necessary), the molecular weight of the sugar derivative is taken as the molecular weight of the structure in which fatty acids are ester - bonded to all the hydroxyl groups of the sugar. When the raw material sugar is an oligosaccharide of trisaccharide or higher, or the purity of the fatty acid is low, or for sugar derivatives where derivatization may not be complete, the weight - average molecular weight was determined by GPC - MALS - RI.

[0071] GPC - MALS - RI measurement System: ACQUITY Arc Empower3 (manufactured by Waters Japan) Detector: (MALS) DAWN (manufactured by Wyatt Technology) (RI) 2414 RI (manufactured by Waters Japan) Column: Two KF - 804L (8 mm I.D.×30 cm) (manufactured by Shodex) Solvent: THF (tetrahydrofuran) Measurement temperature: 40 °C Flow rate: 0.7 mL / min Sample concentration: 1 mg / mL Injection volume: 50 μL

[0072] (2) Total light transmittance The total light transmittance was measured in accordance with JIS K7375:2008. The thickness of the test piece was set at 1 mm. It was confirmed that there were no defects such as scratches, bubbles, bumps, etc., no dust or grease adhesion, no adhesive from the protective material, etc., and no visible voids or particles. In the injection molding of the test piece, the mold surface may be mirror - polished as appropriate using abrasive papers, fixed abrasives, free abrasives, etc. The measurement was carried out using a turbidimeter manufactured by Nippon Denshoku Industries Co., Ltd.

[0073] (3) Haze Haze was measured in accordance with JIS K7136:2000. The test specimens were injection molded with a thickness of 1 mm, and there should be no defects, dust, grease, adhesives from protective materials, scratches, dirt, etc., and no visible voids or foreign substances. In the injection molding of test specimens, the mold surface may be mirror-polished as appropriate using abrasive papers, fixed abrasive grains, loose abrasive grains, etc., and the injection molding machine should be thoroughly cleaned. The measurement was carried out using a turbidimeter manufactured by Nippon Denshoku Industries Co., Ltd.

[0074] (4) Tensile strength Tensile strength was measured in accordance with JIS K7161-2:2014 using the following test specimens and measuring devices to measure the tensile strength (maximum value, MPa) and tensile modulus (MPa). Test specimen: 5A shape (small test specimen) Measuring machine: Universal material testing machine model 5966 manufactured by Instron Corporation Test speed: 2.5 mm / min Distance between chucks: 50 mm (5) Flexural test The flexural test was carried out in accordance with JIS K7171:2016 using the following test specimens and measuring devices to measure the flexural strength (maximum value, MPa) and flexural modulus (MPa). Test specimen: 80 mm × 10 mm × 2 mm Measuring machine: Universal material testing machine model 5966 manufactured by Instron Corporation Test speed: 1.0 mm / min Distance between supports: 32 mm

[0075] (6) Heat distortion temperature The heat distortion temperature was measured in accordance with JIS K7191-2:2015 using the following test specimens and measuring devices. Test specimen: 80 mm × 10 mm × 2 mm Measuring machine: Heat distortion tester No. 148-HD-PC manufactured by Yasuda Seiki Seisakusho Co., Ltd. Test speed: 120 °C / h Placement method: Flatwise Flexural stress: 1.80 MPa (Method A) Distance between supports: 64 mm Heat medium: silicone oil (7) MFR (Melt Flow Rate) The MFR was measured in accordance with JIS K7210-1:2014 using the following test pieces and measuring apparatus to measure the melt flow rate (MFR). Temperature: 200 °C Load: 5.0 Kgf Charge amount: 7 g Measuring machine: Melt Indexer D4003, manufactured by Nippon Dynisco Co., Ltd. Temperature and load: 200 °C, 5 kg (PS), 230 °C, 2.16 kg (PMMA, PC)

[0076] The physical properties of the compositions corresponding to Examples 1 to 8 are shown in Table 1. Also, styrene resin (PSJ - Polystyrene GPPS (grade name: HF77) manufactured by PS Japan), polycarbonate resin (Panlite (registered trademark) (grade name AD - 5503) manufactured by Teijin Limited), and acrylic resin (Acrypet (registered trademark) (grade name TF - 9) manufactured by Mitsubishi Chemical Corporation) are denoted as PS, PC, and PMMA (the same applies to the description of the examples), and their physical properties and the physical properties corresponding to Comparative Examples 1 to 4 are shown in Table 2.

[0077] [Table 1] [Table 2]

[0078] (Example 1) (Palmityl group - modified xylose and styrene - based resin composition 95 mass%) The resin composition of Example 1 had a base resin of styrene - based resin (PS) with a proportion in the composition of 95 mass%, and the sugar derivative was reacted with palmitoyl chloride, which is a biomass with 16 carbon atoms, to the raw material xylose. The molecular weight of the synthesized palmitoylated derivative was 1103.8 g / mol. The transmittance and haze, which are the physical properties of the resin composition, showed excellent values, and other tensile properties, bending properties, heat distortion temperature, and MFR also showed excellent physical property values.

[0079] (Example 2) (90% by mass of palmitoyl group-modified xylose and styrene resin composition) The resin composition of Example 2 uses a styrene resin (PS) as the base resin, and the proportion in the composition is 90% by mass. Similar to Example 1, the sugar derivative was reacted with palmitoyl chloride on raw material xylose. The physical property values of the resin composition of Example 2 show no change in tensile properties and bending properties compared to those of Example 1, but other physical property values are inferior.

[0080] (Example 3) (85% by mass of palmitoyl group-modified xylose and styrene resin composition) The resin composition of Example 3 uses a styrene resin (PS) as the base resin, and the proportion in the composition is 85% by mass. The sugar derivative was reacted with palmitoyl chloride on raw material xylose. The physical property values of the resin composition of Example 3 show excellent values, but it can be seen that as the proportion of the sugar derivative increases compared to Examples 1 and 2, the physical property values tend to deteriorate.

[0081] (Example 4) (90% by mass of acetyl group-modified xylose and styrene resin composition) The resin composition of Example 4 uses a styrene resin (PS) as the base resin, and the proportion in the composition is 90% by mass. The sugar derivative was reacted with acetic anhydride of biomass with 2 carbon atoms on raw material xylose. The molecular weight of the synthesized acetylated derivative was 318.3 g / mol. Since the physical property values show excellent physical property values, it was confirmed that an excellent resin composition can be prepared if the molecular weight is 300 or more.

[0082] (Example 5) (90% by mass of octanoyl group-modified xylose and styrene resin composition) The resin composition of Example 5 uses a styrene resin (PS) as the base resin, and the proportion in the composition is 90% by mass. The sugar derivative was reacted with octanoyl chloride, which is a biomass with 8 carbon atoms, from the raw material xylose. The molecular weight of the synthesized octanoylated derivative was 654.9 g / mol. Its physical property values showed that the molecular weight was about twice that of Example 4, but there was almost no change in the physical property values.

[0083] (Example 6) (Palmityl group-modified sucrose and styrene resin composition 90% by mass) The resin composition of Example 6 uses a styrene resin (PS) as the base resin, and the proportion in the composition is 90% by mass. The sugar derivative was reacted with palmityl chloride from the raw material disaccharide sucrose. The molecular weight of the synthesized palmitylated derivative was 2249.6 g / mol. It can be seen that its physical properties show an increase in the haze value when compared with Examples 2, 4, and 5 in which the base resin was added in the same mass percentage. From this, it can be understood that increasing the molecular weight affects the total light transmittance and haze.

[0084] (Example 7) (Lauriroyl group-modified xylose and acrylic resin composition 90% by mass) The resin composition of Example 7 uses an acrylic resin (PMMA) as the base resin, and the proportion in the composition is 90% by mass. The sugar derivative was reacted with lauroyl chloride from the raw material xylose, and the molecular weight of the synthesized lauroylated derivative was 879.3 g / mol. It can be seen that its physical properties are excellent, and it can be understood that it can also be added to resins other than PS.

[0085] (Example 8) (Palmityl group-modified xylose and polycarbonate resin composition 90% by mass) The resin composition of Example 10 uses a polycarbonate resin (PC) as the base resin, and the proportion in the composition is 90% by mass. The sugar derivative was obtained by reacting raw material xylose with palmitoyl chloride. Although the tensile strength of the physical property values is low, the transmittance, haze, and other physical property values show excellent values. Therefore, although it is difficult to use for films and the like, it is a molded product with excellent transparency.

[0086] (Comparative Example 1) (80% by mass of palmitoyl group-modified xylose and styrene resin composition) The resin composition of Comparative Example 1 uses a styrene resin (PS) as the base resin, and the proportion in the composition is 80% by mass. The sugar derivative was obtained by reacting raw material xylose with palmitoyl chloride. Compared with Examples 1 - 3, its physical properties show a significant decrease in total light transmittance and an increase in haze. Since the MFR is increasing, the addition amount of the sugar derivative is preferably 20% by mass or less.

[0087] (Comparative Example 2) (90% by mass of stearoyl group-modified sucrose and styrene resin composition) The resin composition of Example 9 uses a styrene resin (PS) as the base resin, and the proportion in the composition is 90% by mass. The sugar derivative was obtained by reacting raw material sucrose, a disaccharide, with stearoyl chloride. The molecular weight of the synthesized stearoylated derivative was 2474.0 g / mol. Its physical properties show a total light transmittance of 70% and a haze exceeding 10%. Therefore, it can be seen that the molecular weight of the sugar derivative is preferably 2300 g / mol or less.

[0088] (Comparative Example 3) (Comparative Example 4) (90% by mass of xylose or xylooligosaccharide and styrene resin composition) The resin compositions of Comparative Example 3 and Comparative Example 4 use a styrene resin (PS) as the base resin, and the proportion in the composition is 90% by mass. Unmodified xylose and unmodified xylooligosaccharide are directly added to the styrene resin. However, neither Comparative Example 3 nor Comparative Example 4 could be molded. Therefore, it can be seen that the sugar must be derivatized.

Claims

1. A resin composition having excellent transparency, comprising: a base resin containing at least one of a styrene resin, a polycarbonate resin, and an acrylic resin; and a sugar derivative in which a fatty acid is ester-bonded to a hydroxyl group of a sugar. The base resin has a content in the resin composition of more than 80% by mass and 97% by mass or less. The resin composition having excellent transparency, wherein the sugar derivative has a molecular weight of 300 g / mol or more and 2300 g / mol or less.

2. The resin composition having excellent transparency according to claim 1, wherein the sugar and / or the fatty acid is derived from biomass.

3. The resin composition having excellent transparency according to claim 2, wherein the sugar is xylose.

4. The resin composition having excellent transparency according to any one of claims 1 to 3, wherein the sugar derivative has a molecular weight of 600 g / mol or more and 1200 g / mol or less.

5. A molded article comprising the resin composition having excellent transparency according to any one of claims 1 to 3.

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