Resin composition with excellent transparency and design quality and molded product including the same

Abstract

To provide a molded product that contains biomass materials, reduces environmental burden during disposal, yet retains the intrinsic characteristics of polycarbonate resin as much as possible. exhibiting excellent transparency and design quality with enhanced biomass presence, and also to provide a resin composition that enables production of the molded product.SOLUTION: The present invention provides a resin composition with excellent transparency and design quality that contains 100 pts.mass of a resin component comprising 50-99 mass% of a polycarbonate resin (A) and 1-50 mass% of a transparent polyester resin (B), combined with 0.05-18 pts.mass of coffee extraction residue (C).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a resin composition having excellent transparent design properties and a molded article containing the same. [Background technology]

[0002] In recent years, canned coffee, coffee vending machines, instant coffee, etc. have been consumed in large quantities, and a large amount of coffee extraction residue is generated at the manufacturing plants of these products, major chain cafes, etc. Until now, the residue has often been disposed of by landfilling, incineration, etc., but with the increase in the amount generated and the growing interest in environmental issues, it is becoming difficult to dispose of it in such a way. Effective utilization of coffee extraction residue is an important issue for the future from the viewpoint of environmental issues as well.

[0003] On the other hand, there are new attempts to develop new and useful bio-derived materials, that is, environmentally friendly materials with a high biomass ratio (plant-based ratio), excellent environmental performance such as reduced carbon dioxide emissions and reduced fossil raw materials, and low environmental impact when disposed of. For example, Patent Document 1 discloses a food tray made of an olefin resin containing natural organic matter extraction residue as an effective utilization method for coffee extraction residue as a biomass material. Patent Documents 2 and 3 disclose thermoplastic resin compositions using coffee extraction residue as a filler. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2000-281917 [Patent Document 2] Patent Publication No. 5-277460 [Patent Document 3] Patent Publication No. 2010-138238 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the resin compositions described in Patent Documents 1 to 3 use base resins such as polypropylene resins that have low heat resistance and light transmittance, and therefore do not provide sufficient heat resistance and light transmittance, and their applications are limited to packaging materials and molded articles for miscellaneous goods.

[0006] The present invention aims to provide a molded article that contains a biomass material, has a low environmental impact when disposed of, and yet has excellent transparent design properties that accentuate the presence of the biomass without reducing the inherent properties of polycarbonate resin as much as possible, and a resin composition from which the molded article can be produced. [Means for solving the problem]

[0007] As a result of intensive research into solving the above problems, the inventors have found that the above problems can be solved by blending a specific amount of coffee extraction residue (C) with a polycarbonate resin (A) and a transparent polyester resin (B), and have thus completed the present invention.

[0008] That is, the present invention (1) is a resin composition having excellent transparent designability, characterized in that it contains 0.05 to 18 parts by mass of coffee extraction residue (C) per 100 parts by mass of a resin component consisting of 50 to 99% by mass of polycarbonate resin (A) and 1 to 50% by mass of transparent polyester-based resin (B).

[0009] The present invention (2) is the resin composition having excellent transparent design property according to the present invention (1), in which the transparent polyester-based resin (B) is at least one selected from the group consisting of polycyclohexylene dimethylene terephthalate resin, polybutylene adipate terephthalate resin, and polycaprolactone resin.

[0010] The present invention (3) relates to the resin composition having excellent transparent design property according to the present invention (2), in which the transparent polyester resin (B) is a polycyclohexylene dimethylene terephthalate resin.

[0011] The present invention (4) is the resin composition having excellent transparent design property according to the present invention (3), in which the polycyclohexylene dimethylene terephthalate resin is a glycol-modified polycyclohexylene dimethylene terephthalate or a poly(cyclohexylene dimethylene terephthalate) copolyester resin.

[0012] The present invention (5) is the resin composition having excellent transparent designability according to any one of the present inventions (1) to (4), further comprising 1 mass % or less of an antioxidant (D).

[0013] The present invention (6) is the resin composition having excellent transparent design property according to any one of the present inventions (1) to (5), further comprising one or more selected from the group consisting of a colorant, a release agent, a softener, an antistatic agent and an impact modifier.

[0014] The present invention (7) is a molded article comprising the resin composition having excellent transparent design property according to any one of the present inventions (1) to (6). Effect of the Invention

[0015] The transparent design resin composition of the present invention is an environmentally friendly material that contains coffee extraction residue, which is a biomass material, and has a low environmental impact when disposed of. It is a material that has a good appearance when molded and can also impart the transparent design properties unique to biomass materials. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The embodiments will be described in detail below. However, more detailed explanations than necessary may be omitted. For example, detailed explanations of already well-known matters or duplicate explanations of substantially the same configurations may be omitted. This is to avoid the following explanation becoming unnecessarily redundant and to facilitate understanding by those skilled in the art. Note that the inventors provide the following explanations to enable those skilled in the art to fully understand the present invention, and do not intend to limit the subject matter described in the claims.

[0017] The resin composition of the present invention, which has excellent transparent design properties, is characterized by containing 0.05 to 18 parts by mass of coffee extraction residue (C) per 100 parts by mass of a resin component consisting of 50 to 99% by mass of polycarbonate resin (A) and 1 to 50% by mass of transparent polyester resin (B).

[0018] The polycarbonate resin (A) used in the present invention is a polymer obtained by the phosgene process in which various dihydroxydiaryl compounds are reacted with phosgene, or the ester exchange process in which a dihydroxydiaryl compound is reacted with a carbonate ester such as diphenyl carbonate, and a representative example is an aromatic polycarbonate resin produced from 2,2-bis(4-hydroxyphenyl)propane (bisphenol A).

[0019] Examples of the dihydroxydiaryl compound include, in addition to bisphenol A, bis(hydroxyaryl)alkanes such as bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)octane, bis(4-hydroxyphenyl)phenylmethane, 2,2-bis(4-hydroxyphenyl-3-methylphenyl)propane, 1,1-bis(4-hydroxy-3-tert-butylphenyl)propane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, and 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane; bis(hydroxyaryl)cycloalkanes such as 1,1-bis(4-hydroxyphenyl)cyclopentane and 1,1-bis(4-hydroxyphenyl)cyclohexane; dihydroxydiaryl ethers such as 4,4'-dihydroxydiphenyl ether and 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether; dihydroxydiaryl sulfides such as 4,4'-dihydroxydiphenyl sulfide; dihydroxydiaryl sulfoxides such as 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; and dihydroxydiaryl sulfones such as 4,4'-dihydroxydiphenyl sulfone and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfone.

[0020] These can be used alone or in combination of two or more, but those that are not substituted with halogens are preferred from the viewpoint of preventing the emission of gases containing the halogens into the environment during combustion. In addition to these, piperazine, dipiperidylhydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, etc. may also be used in combination.

[0021] Furthermore, the above dihydroxyaryl compounds may be used in combination with the following trivalent or higher phenolic compounds: Trivalent or higher phenolic compounds include phloroglucin, 4,6-dimethyl-2,4,6-tri-(4-hydroxyphenyl)-heptene, 2,4,6-dimethyl-2,4,6-tri-(4-hydroxyphenyl)-heptane, 1,3,5-tri-(4-hydroxyphenyl)-benzene, 1,1,1-tri-(4-hydroxyphenyl)-ethane, and 2,2-bis-[4,4-(4,4′-dihydroxydiphenyl)-cyclohexyl]-propane.

[0022] The viscosity average molecular weight of the polycarbonate resin (A) is not particularly limited, but is usually 10,000 to 100,000, more preferably 15,000 to 30,000, and even more preferably 16,000 to 26,000, from the viewpoints of moldability and strength. In addition, when producing such a polycarbonate resin, a molecular weight regulator, a catalyst, etc. can be used as necessary. The viscosity average molecular weight is measured by preparing a 0.5 mass% solution of the polycarbonate resin in methylene chloride as a solvent, measuring the specific viscosity (ηsp) at a temperature of 20°C using a Cannon-Fenske type viscometer, determining the limiting viscosity [η] by concentration conversion, and calculating the viscosity average molecular weight from the following Schnell formula. [η] = 1.23 × 10 -4 M 0.83

[0023] The polycarbonate resin (A) may contain recycled polycarbonate resin.

[0024] The transparent polyester resin (B) used in the present invention is not particularly limited as long as it can be blended with a polycarbonate resin and has transparency, and examples of the resin include polycyclohexylene dimethylene terephthalate resin (PCT), polybutylene adipate terephthalate resin (PBAT), polycaprolactone resin (PCL), etc. Among them, polycyclohexylene dimethylene terephthalate resin (PCT) is preferred from the viewpoint of heat resistance.

[0025] PCT is a transparent polyester resin obtained by polycondensation of a terephthalic acid polycondensation component, which is a dicarboxylic acid polycondensation component, and a glycol polycondensation component containing preferably 40 mol% or more of 1,4-cyclohexanedimethanol. PCT includes not only PCT homopolymers (PCT), but also PCT terminals modified with glycols (PCTG), and copolymers copolymerized with diol components such as tetramethylcyclobutanediol (TMCD). Commercially available resins include, for example, polycyclohexylene dimethylene terephthalate-glycol copolyester (SK Chemicals' SKY GREEN JN200) and poly(1,4-cyclohexylene dimethylene terephthalate) copolyester (Eastman Kecal's Tritan TX1001).

[0026] PBAT is a petroleum-derived, biodegradable aromatic polyester (hydrolysis type) made from BDO (1.4-BG), terephthalic acid, and adipic acid, and is a material that combines the excellent decomposition performance of aliphatic polyesters with the excellent mechanical properties of aromatic polyesters. Commercially available resins include, for example, PBAT A400 manufactured by WANGO.

[0027] PCL is a transparent polyester resin produced by ring-opening polymerization of ε-caprolactone in the presence of a catalyst, and a homopolymer of 2-oxepanone is preferably used. It also includes polycaprolactone modified by coexisting with 1,4-butanediol during ring-opening polymerization of ε-caprolactone, and modified polycaprolactone in which the molecular end is substituted with an ether or ester group. The viscosity average molecular weight of polycaprolactone is preferably 10,000 to 100,000, and more preferably 40,000 to 90,000. Commercially available resins include CAPA6500C (viscosity average molecular weight: 50,000) and CAPA6800 (viscosity average molecular weight: 80,000) manufactured by Solvay, and Tone Polymer P-787 (viscosity average molecular weight: 80,000) manufactured by Dow Chemical Co.

[0028] The transparent polyester resin (B) may be used alone or in combination of a plurality of resin components.

[0029] The blending amount of the transparent polyester resin (B) is 1 to 50% by mass in the resin components of the polycarbonate resin (A) and the transparent polyester resin, but is preferably 5 to 40% by mass. If it is less than 1% by mass, the fluidity during melting is poor, and when the processing temperature is increased, problems such as the decomposition of the coffee extraction residue (C) occur, whereas if it exceeds 50% by mass, the heat resistance decreases.

[0030] The coffee extraction residue (C) used in the present invention is the residue obtained after coffee beans are ground into powder using a mill or the like and extracted as coffee. The coffee extraction residue contains alkaloids such as caffeine, and therefore has high antiseptic and insecticidal properties, and also acts as a deodorant against bad odors due to the combined action of the odor peculiar to coffee and these multiple components. The coffee extraction residue can be obtained, for example, as Tully's coffee extraction residue. In addition, the coffee extraction residue contains a lot of moisture, and there is a risk of causing decomposition of the resin during granulation, so a previously dried one is used. There are no particular limitations on the drying method as long as it removes moisture from the coffee extraction residue, but a general hot air circulation type drying device is used, and the drying temperature is 110 to 140°C and the drying time is about 2 to 4 hours. More preferably, the drying temperature is 130°C and the drying time is 2 hours.

[0031] The moisture content of the coffee extraction residue (C) is preferably less than 30%, more preferably less than 10%, and even more preferably less than 5%. If it is 30% or more, the moldability may be insufficient. The moisture content can be measured by measuring the mass before and after drying.

[0032] The coffee extract residue (C) may be used in combination with optional ingredients that can be mixed and treated with a polymer binder, such as wood chips or powder, calcium carbonate, talc or ceramic powder, metal powders such as aluminum and copper (static charge removers), activated carbon, zeolite particles, and other functional materials.

[0033] The amount of coffee extract residue (C) is 0.05 to 18 parts by mass relative to 100 parts by mass of the resin component consisting of polycarbonate resin (A) and transparent polyester resin (B). If it is less than 0.05 parts by mass, the presence of biomass becomes obscured, and if it exceeds 18 parts by mass, the light transmittance decreases. The amount is preferably 0.1 to 10 parts by mass, and more preferably 1 to 10 parts by mass.

[0034] The resin composition of the present invention having excellent transparent designability preferably further contains an antioxidant (D).

[0035] The antioxidant (D) may be a phosphorus-based antioxidant and / or a phenol-based antioxidant, and is preferably a phosphorus-based antioxidant. Examples of the phosphorus-based antioxidant include the following: [ka] Preferred are phosphite compounds having a phosphite structure represented by the following formulae (1), (2), (3) and (4):

[0036] General formula (1): [ka] (In the formula, R 1 represents an alkyl group having 1 to 20 carbon atoms, and a represents an integer of 0 to 3.

[0037] In the general formula (1), R 1 is an alkyl group having 1 to 20 carbon atoms, and more preferably an alkyl group having 1 to 10 carbon atoms.

[0038] Examples of the compound represented by the general formula (1) include triphenyl phosphite, tricresyl phosphite, tris(2,4-di-t-butylphenyl) phosphite, trisnonylphenyl phosphite, etc. Among these, tris(2,4-di-t-butylphenyl) phosphite is particularly suitable, and is commercially available as, for example, Irgafos 168 manufactured by BASF ("Irgafos" is a registered trademark of BASF Societas Europea).

[0039] General formula (2): [ka] (In the formula, R 2 , R 3 , R 5 and R 6 R each independently represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, or a phenyl group. 4 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; X represents a single bond, a sulfur atom, or a group represented by the formula: -CHR 7 - (where R 7 represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group having 5 to 8 carbon atoms. A represents an alkylene group having 1 to 8 carbon atoms or a group represented by the formula: *-COR 8 - (where R 8 represents a single bond or an alkylene group having 1 to 8 carbon atoms, and * represents a bond on the oxygen side. Either Y or Z represents a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms, or an aralkyloxy group having 7 to 12 carbon atoms, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.

[0040] In the general formula (2), R 2 , R 3 , R 5 and R 6each independently represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, or a phenyl group.

[0041] Here, examples of the alkyl group having 1 to 8 carbon atoms include methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, t-butyl, t-pentyl, i-octyl, t-octyl, and 2-ethylhexyl groups. Examples of the cycloalkyl group having 5 to 8 carbon atoms include cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl groups. Examples of the alkylcycloalkyl group having 6 to 12 carbon atoms include 1-methylcyclopentyl, 1-methylcyclohexyl, and 1-methyl-4-i-propylcyclohexyl groups. Examples of the aralkyl group having 7 to 12 carbon atoms include benzyl, α-methylbenzyl, and α,α-dimethylbenzyl groups.

[0042] R 2 , R 3 and R 5 are each independently preferably an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, or an alkylcycloalkyl group having 6 to 12 carbon atoms. 2 and R 5 are each independently preferably a t-alkyl group such as a t-butyl group, a t-pentyl group, or a t-octyl group, a cyclohexyl group, or a 1-methylcyclohexyl group. In particular, R3 is preferably an alkyl group having 1 to 5 carbon atoms such as a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a sec-butyl group, a t-butyl group, or a t-pentyl group, and more preferably a methyl group, a t-butyl group, or a t-pentyl group.

[0043] R 6is preferably a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group having 5 to 8 carbon atoms, and more preferably a hydrogen atom, or an alkyl group having 1 to 5 carbon atoms, such as a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a sec-butyl group, a t-butyl group, or a t-pentyl group.

[0044] In the general formula (2), R 4 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Examples of the alkyl group having 1 to 8 carbon atoms include the above-mentioned R 2 , R 3 , R 5 and R 6 In particular, R 4 is preferably a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and more preferably a hydrogen atom or a methyl group.

[0045] In the general formula (2), X is a single bond, a sulfur atom or a group represented by the formula: -CHR 7 -, where the formula is -CHR 7 -R in 7 represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group having 5 to 8 carbon atoms. Examples of the alkyl group having 1 to 8 carbon atoms and the cycloalkyl group having 5 to 8 carbon atoms include the above-mentioned R 2 , R 3 , R 5 and R 6 Examples of X include the alkyl and cycloalkyl groups exemplified in the description of 1. In particular, X is preferably a single bond, a methylene group, or a methylene group substituted with a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a t-butyl group, or the like, and more preferably a single bond.

[0046] In the general formula (2), A is an alkylene group having 1 to 8 carbon atoms or a group represented by the formula: 8Examples of the alkylene group having 1 to 8 carbon atoms include a methylene group, an ethylene group, a propylene group, a butylene group, a pentamethylene group, a hexamethylene group, an octamethylene group, and a 2,2-dimethyl-1,3-propylene group, and the like, with a propylene group being preferred. 8 -R in 8 R represents a single bond or an alkylene group having 1 to 8 carbon atoms. 8 Examples of the alkylene group having 1 to 8 carbon atoms represented by the formula (I) include the alkylene groups exemplified in the description of A above. 8 is preferably a single bond or an ethylene group. 8 The * in - is a bond on the oxygen side, indicating that the carbonyl group is bonded to the oxygen atom of the phosphite group.

[0047] In the general formula (2), one of Y and Z represents a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms, or an aralkyloxy group having 7 to 12 carbon atoms, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Examples of the alkoxy group having 1 to 8 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, a t-butoxy group, and a pentyloxy group. Examples of the aralkyloxy group having 7 to 12 carbon atoms include a benzyloxy group, an α-methylbenzyloxy group, and an α,α-dimethylbenzyloxy group. Examples of the alkyl group having 1 to 8 carbon atoms include the above-mentioned R 2 , R 3 , R 5 and R 6 Examples of the alkyl group include those exemplified in the explanation of the above.

[0048] Examples of the compound represented by the general formula (2) include 2,4,8,10-tetra-t-butyl-6-[3-(3-methyl-4-hydroxy-5-t-butylphenyl)propoxy]dibenzo[d,f][1,3,2]dioxaphosphepine, 6-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propoxy]-2,4,8,10-tetra-t-butyldibenzo[d,f][1,3,2]dioxaphosphepine, Examples thereof include 6-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propoxy]-4,8-di-t-butyl-2,10-dimethyl-12H-dibenzo[d,g][1,3,2]dioxaphosphocin, and 6-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxy]-4,8-di-t-butyl-2,10-dimethyl-12H-dibenzo[d,g][1,3,2]dioxaphosphocin. Among these, when the polycarbonate resin composition is used in a field where optical properties are particularly required, 2,4,8,10-tetra-t-butyl-6-[3-(3-methyl-4-hydroxy-5-t-butylphenyl)propoxy]dibenzo[d,f][1,3,2]dioxaphosphepine is suitable, and is commercially available, for example, as Sumilizer GP manufactured by Sumitomo Chemical Co., Ltd. ("Sumilizer" is a registered trademark).

[0049] General formula (3): [ka] (In the formula, R 9 and R 10 each independently represents an alkyl group having 1 to 20 carbon atoms or an aryl group which may be substituted with an alkyl group, and b and c each independently represent an integer of 0 to 3.

[0050] Examples of the compound represented by the general formula (3) include bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, phenyl bisphenol A pentaerythritol diphosphite, etc. Bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is commercially available as Adeka STAB PEP-36 ("Adeka STAB" is a registered trademark) manufactured by ADEKA CORPORATION.

[0051] General formula (4): [ka]

[0052] (In the formula, R 11 ~R 18 R each independently represents an alkyl group or an alkenyl group having 1 to 3 carbon atoms. 11 and R 12 , R 13 and R 14 , R 15 and R 16 , R 17 and R 18 may be bonded to each other to form a ring. 19 ~R 22 each independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms. each of d to g independently represents an integer of 0 to 5. X 1 ~X 4 Each of X independently represents a single bond or a carbon atom. 1 ~X 4 is a single bond, R 11 ~R 22 The functional group connected to the single bond is excluded from the general formula (4).

[0053] A specific example of the compound represented by the general formula (4) is bis(2,4-dicumylphenyl)pentaerythritol diphosphite, which is commercially available under the trade name "Doverphos (registered trademark) S-9228" manufactured by Dover Chemical Co., and under the trade name "ADEKA STAB PEP-45" (bis(2,4-dicumylphenyl)pentaerythritol diphosphite) manufactured by ADEKA Corporation.

[0054] Moreover, instead of or in addition to any of the compounds represented by the general formulas (1) to (4) above, a compound represented by the following general formula (5) may be used.

[0055] General formula (5): [ka] (In the formula, R 23 ~R 26 represents an alkyl group having 1 to 20 carbon atoms, or an aryl group which may be substituted with an alkyl group.

[0056] Specific examples of the compound represented by general formula (5) include, for example, [1,1'-biphenyl]-4,4-diylbis[bis(2,4-di-t-butylphenoxy)phosphine], and the like. For example, Irgafos P-EPQ (trade name) manufactured by BASF and Sandstab P-EPQ (trade name) manufactured by Clariant Japan Co., Ltd. are commercially available.

[0057] The amount of the antioxidant (D) in the resin composition is preferably 1% by mass or less, more preferably 0.02 to 0.8% by mass. If the amount of the antioxidant exceeds 1% by mass, the impact strength may decrease. If the amount of the antioxidant is less than 0.02% by mass, the effect of improving the color may be insufficient.

[0058] Moreover, the resin composition according to the present invention may contain a phenol-based antioxidant in place of or in addition to the phosphorus-based antioxidant.

[0059] An example of the phenol-based antioxidant is a compound represented by the following general formula (6).

[0060] General formula (6): [ka] (In the formula, R 23 represents an alkyl group having 1 to 20 carbon atoms, or an aryl group which may be substituted with an alkyl group.

[0061] Other phenolic antioxidants include α-tocopherol, butylated hydroxytoluene, sinapyl alcohol, vitamin E, 2-tert-butyl-6-(3'-tert-butyl-5'-methyl-2'-hydroxybenzyl)-4-methylphenylacrylate, 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'-methyl 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 4,4'-methylenebis(2,6-di-tert-butylphenol), 2,2'-methylenebis(4-methyl-6-cyclohexylphenol), 2,2'-dimethylenebis(6-α-methyl-benzyl-p-cresol) 2,2'-ethylidenebis(4,6-di-tert-butylphenol), 2,2'-butylidenebis(4-methyl-6-tert-butylphenol), 4,4'-butylidenebis(3-methyl-6-tert-butylphenol), triethyl 1,6-Hexanediol bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], bis[2-tert-butyl-4-methyl 6-(3-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-butylphenyl)butane, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl- Examples include 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. All of these are easily available. The above phenol-based antioxidants can be used alone or in combination of two or more.

[0062] Among these, n-octadecyl-3-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate, which is a compound represented by the above general formula (6), is suitable, and is commercially available, for example, under the trade name "ADEKA STAB AO-50" manufactured by ADEKA Corporation.

[0063] The amount of the phenol-based antioxidant is preferably 0.5 parts by mass or less based on 100 parts by mass of the resin component consisting of the aromatic polycarbonate resin and the styrene-based resin.

[0064] The transparent design resin composition of the present invention may contain additives such as other resins, heat stabilizers, colorants, release agents, softeners, antistatic agents, impact modifiers, ultraviolet absorbers, pigments, fillers, and flow improvers, as long as the effects are not impaired.

[0065] Other resins include SBC (styrene-butadiene block copolymer resin): a copolymer having a styrene block in which only styrene monomers are polymerized and a butadiene block in which only butadiene is polymerized / also called a styrene-based thermoplastic elastomer). Examples of SBC include Clearen MB910 and 880L (manufactured by Denka Co., Ltd.), etc., examples of GPPS include Toyo Styrol G210C (manufactured by Toyo Styrene Co., Ltd.), etc., and examples of HIPS include Toyo Styrol E640N (manufactured by Toyo Styrene Co., Ltd.). PBT (polybutylene terephthalate) can also be used. Examples of PBT include Duranex 600FP manufactured by Polyplastics Co., Ltd.

[0066] The transparent design resin composition of the present invention can be produced by, for example, mixing polycarbonate resin (A), transparent polyester resin (B) and coffee extraction residue (C), and, if necessary, mixing antioxidant (D) and the various additives. As long as the transparent design resin composition of the present invention can be obtained, the production method is not particularly limited, and the type and amount of each component can be appropriately adjusted. The method of mixing the components is also not particularly limited, and examples include a method of mixing with a known mixer such as a tumbler or ribbon blender, and a method of melt kneading with an extruder. Pellets of the transparent design resin composition can be easily obtained by these methods.

[0067] The molded article of the present invention is characterized by containing the transparent design resin composition of the present invention described above. The manufacturing method of the molded article of the present invention is not particularly limited as long as the desired molded article can be obtained, but for example, a method of molding the transparent design resin composition by a known injection molding method, compression molding method, 3D printer, etc. can be mentioned.

[0068] The uses of the transparent design resin composition of the present invention are not particularly limited, but can be applied to various production processes such as injection molding, extrusion molding, and 3D printers, as well as interior and exterior vehicle parts, electrical and electronic product housings and related parts, lighting-related parts, and building materials.

[0069] As described above, the embodiments of the present invention have been described as examples of the present invention. However, the technology of the present invention is not limited to the above, and can be applied to embodiments in which appropriate changes, substitutions, additions, omissions, etc. are made.

[0070] The polycarbonate resin composition of the present invention is a material that does not reduce the inherent properties of polycarbonate resin, such as heat resistance (90°C or higher) and light transmittance, as much as possible. It is suitable for industrial applications requiring high heat resistance, such as vehicle interior and exterior parts, electrical and electronic product housings and related parts, lighting related parts, and building materials. By maintaining light transmittance, it is possible to give the molded product a clear and glossy appearance, and a molded product with a highly designed appearance that emphasizes the biomass content can be obtained. In addition, by taking advantage of the light transmittance, it is expected to be used in light design materials that project light from a light source from the back. In addition, it can be applied to various production methods such as injection molding, extrusion molding, and 3D printers, and can be used suitably for a wide range of applications, so its industrial value is extremely high. EXAMPLES

[0071] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, "parts" and "%" are based on mass.

[0072] The raw materials used in the examples are shown below. 1.(A) Polycarbonate resin: Polycarbonate resin synthesized from bisphenol A and phosgene (SD Polycarbonate 200-13 manufactured by Sumika Polycarbonate Co., Ltd.) 2.(B) Transparent polyester resin: Polycyclohexylenedimethylene terephthalate-glycol copolyester (abbreviated as "PCTG") is a transparent polyester resin obtained by polycondensing a terephthalic acid-based polycondensation component with a glycol-based polycondensation component containing 40 mol% or more of 1,4-cyclohexanedimethanol. (SK Chemicals SKY GREEN JN200) 3. (C) Coffee extraction residue Tully's coffee extraction residue 4. (D) Antioxidants: 4-1.[1,1´-biphenyl]-4,4-diylbis[bis(2,4-di-t-butylphenoxy)phosphine] (abbreviated as "AO1") (Sandstub P-EPQ manufactured by Clariant Japan Co., Ltd.) 4-2. Tris(2,4-di-t-butylphenyl)phosphite (abbreviated as "AO2") (BASF Irgafos 168) 5. Others (resins used as comparative examples) Polypropylene resin (abbreviated as "PP") (BC03C manufactured by Japan Polypropylene Corporation)

[0073] Examples 1 to 4 and Comparative Examples 1 and 2 The various ingredients were mixed in a tumbler with the ingredients and ratios shown in Table 1, and melt-kneaded at a cylinder temperature of 230°C using a single-screw extruder (VS40 mm extruder, manufactured by Tanabe Plastics Machinery Co., Ltd.) to obtain various pellets. The pellets were evaluated by the methods shown below, and the evaluation results are shown in Table 1.

[0074] <Transparent design> A 23,000 lux light source was shone on a 3 mm molded product from a position 3 cm away from the molded product, and it was visually observed whether the light passed through to the molded surface opposite the light source, and evaluated according to the following criteria. 〇: Light can be seen on the molded surface, and the transparent design is excellent △: Light can be seen on the molded surface, but the transparent design is insufficient ×: No light can be seen on the molded surface, and the transparent design is poor.

[0075] <dtul> Using the pellets obtained, 1 / 4-inch-thick test pieces for deflection under load were made using a Toshiba Machine 100-ton injection molding machine, and the deflection temperature under load (DTUL) was measured in accordance with ASTM D648. The test pieces were not annealed. A deflection temperature under load of 90°C or higher was considered to pass.

[0076] <Productivity> During the process from melt kneading in a twin-screw extruder to pelletization, the state of the strand emerging from the tip of the extruder was visually observed and evaluated according to the following criteria. 〇: The strands are stable and pelletization is possible. △: Strands are sometimes distorted or broken, but pellets can be made. ×: Strands are frequently distorted or broken, making it difficult to produce pellets (difficult to granulate)

[0077] [Table 1]

[0078] From the evaluation results shown in Table 1, it was confirmed that the transparent design resin compositions of Examples 1 to 4 were excellent in transparent design, heat resistance, and productivity. On the other hand, the resin composition of Comparative Example 1 was poor in productivity and could not be granulated. In addition, the resin composition of Comparative Example 2 had no problems with productivity, but did not express a transparent design. [Industrial Applicability]

[0079] The transparent design resin composition of the present invention is an environmentally friendly material that contains coffee extract residue, which is a biomass material, and has a low environmental impact when disposed of. It is a material that has a good appearance when molded and can impart a design characteristic of biomass materials. Moreover, it is a material that does not reduce the various properties such as heat resistance temperature (90°C or higher) and light transmittance that polycarbonate resin originally has. It is suitable for industrial applications requiring high heat resistance, interior and exterior parts of vehicles, housings and related parts for electric and electronic products, lighting related parts, building materials, etc. By maintaining light transmittance, it is possible to give the molded body a clear and glossy feel, and a molded body with a highly designed appearance (transparent design) that emphasizes the biomass content can be obtained. In addition, by taking advantage of the light transmittance, it is expected to be used as a light design material that projects light from a light source from the back. In addition, it can be applied to various production such as injection molding, extrusion molding, and 3D printers, and can be used suitably for a wide range of applications, so it has extremely high industrial utility value.< / dtul>

Claims

1. A resin composition having excellent transparent designability, characterized in that it contains 0.05 to 18 parts by mass of coffee extraction residue (C) per 100 parts by mass of a resin component consisting of 50 to 99% by mass of polycarbonate resin (A) and 1 to 50% by mass of transparent polyester-based resin (B).

2. 2. The resin composition according to claim 1, wherein the transparent polyester resin (B) is at least one selected from the group consisting of polycyclohexylene dimethylene terephthalate resin, polybutylene adipate terephthalate resin, and polycaprolactone resin.

3. 3. The resin composition according to claim 2, wherein the transparent polyester resin (B) is a polycyclohexylene dimethylene terephthalate resin.

4. 4. The resin composition having excellent transparent designability according to claim 3, wherein the polycyclohexylene dimethylene terephthalate resin is a glycol-modified polycyclohexylene dimethylene terephthalate or a poly(cyclohexylene dimethylene terephthalate) copolyester resin.

5. The resin composition according to claim 1 or 2, further comprising an antioxidant (D) in an amount of 1 mass % or less.

6. 3. The resin composition having excellent transparent designability according to claim 1, further comprising at least one selected from the group consisting of a colorant, a release agent, a softener, an antistatic agent and an impact modifier.

7. A molded article comprising the resin composition according to claim 1 or 2, which has excellent transparent designability.

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