Resin composition molding

Abstract

To provide a resin composition molding which is excellent in adhesion of a resin film applied to the surface of the molding while having high rigidity.SOLUTION: The resin composition molding contains 50 mass% or more of an olefinic polymer A and satisfies the following requirements (i)-(ii): (i) the amount of oxygen atoms on the surface of the resin composition molding determined by X-ray photoelectron spectroscopy is 0.01 atom% or more and 8.5 atom% or less; and (ii) the wet tension of the surface of the resin composition molding is 25 mN / m or more and 45 mN / m or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a molded article of a resin composition. [Background technology]

[0002] Aliphatic polyester films have been known as biodegradable resin molded articles. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3206747 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional aliphatic polyester films, there is still room for improvement in the adhesion of the resin film applied to the film surface.

[0005] The present invention has been made in consideration of the above problems, and has an object to provide a resin composition molded article that has high rigidity and excellent adhesion of a resin film applied to the surface of the molded article. [Means for solving the problem]

[0006] [1] A molded article of a resin composition containing 50% by mass or more of an olefin polymer A and satisfying the following requirements (i) and (ii): (i): The amount of oxygen atoms on the surface of the resin composition molded product as determined by X-ray photoelectron spectroscopy is 0.01 atom % or more and 8.5 atom % or less. (ii) The surface of the resin composition molded article has a wetting tension of 25 mN / m or more and 45 mN / m or less.

[0007] [2] A molded article of the resin composition according to claim [1], further satisfying the following requirement (iii): (iii): In an infrared absorption spectrum of the surface of the resin composition molded product measured with an infrared spectrophotometer, the ratio RCO / RCH of the peak intensity RCO of the stretching vibration of a C=O bond to the peak intensity RCH of the stretching vibration of a C-H bond is 0.05 or more. [3] The molded article of the resin composition according to [1] or [2], further comprising an aliphatic polyester polymer B. [4] The molded article of the resin composition according to [3], wherein the aliphatic polyester polymer B is a polyhydroxyalkanoate polymer. [5] The molded article of the resin composition according to [3], wherein the aliphatic polyester polymer B is a poly(3-hydroxyalkanoate) polymer B. [6] The resin composition molded body according to any one of [3] to [5], wherein the content of the olefin polymer A is 51 to 99.9 parts by mass and the content of the aliphatic polyester polymer B is 0.1 to 49 parts by mass, relative to 100 parts by mass in total of the olefin polymer A and the aliphatic polyester polymer B. [7] The resin composition molded body according to any one of [3] to [5], wherein the content of the olefin polymer A is 60.1 to 99.9 parts by mass and the content of the aliphatic polyester polymer B is 0.1 to 39.9 parts by mass, relative to 100 parts by mass in total of the olefin polymer A and the aliphatic polyester polymer B. [8] The molded article of the resin composition according to any one of [1] to [7], wherein the olefin polymer A is a propylene polymer. Effect of the Invention

[0008] According to the present invention, there is provided a resin composition molded article which has high rigidity and excellent adhesion of a resin film applied to the surface of the molded article. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic cross-sectional view of a resin film-applied resin composition molded article according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, several embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

[0011] (Resin composition molded body) The resin composition molded article according to the present invention is a molded article of a resin composition containing 50 mass % of an olefin polymer A, and the resin composition may further contain an aliphatic polyester polymer B.

[0012] <Olefin Polymer A> The olefin polymer A is a polymer containing 50% by mass or more of structural units derived from an olefin having from 2 to 10 carbon atoms (wherein the total amount of the olefin polymer is taken as 100% by mass). Examples of the olefin having from 2 to 10 carbon atoms include ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, and 1-decene.

[0013] The olefin polymer A may contain a structural unit derived from a monomer other than an olefin having from 2 to 10 carbon atoms. Examples of the monomer other than an olefin having from 2 to 10 carbon atoms include aromatic vinyl monomers such as styrene, unsaturated carboxylic acids such as acrylic acid and methacrylic acid, unsaturated carboxylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, and ethyl methacrylate, vinyl ester compounds such as vinyl acetate, conjugated dienes such as 1,3-butadiene and 2-methyl-1,3-butadiene (isoprene), and non-conjugated dienes such as dicyclopentadiene and 5-ethylidene-2-norbornene.

[0014] The olefin polymer A can be at least one selected from the group consisting of ethylene polymers, propylene polymers, and butene polymers, and may be any combination of two or more of these.

[0015] An ethylene-based polymer is a polymer containing 50% by mass or more of structural units derived from ethylene, and examples thereof include ethylene homopolymer, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer, and ethylene-1-butene-1-hexene copolymer. The ethylene-based polymer may be a combination of two or more ethylene-based polymers.

[0016] The propylene-based polymer is a polymer containing 50% by mass or more of structural units derived from propylene, and examples thereof include propylene homopolymer, propylene-ethylene copolymer, propylene-1-butene copolymer, propylene-1-hexene copolymer, propylene-1-octene copolymer, propylene-ethylene-1-butene copolymer, propylene-ethylene-1-hexene copolymer, and propylene-ethylene-1-octene copolymer. The propylene-based polymer may be a combination of two or more kinds of propylene-based polymers. It is preferable that the olefin-based polymer A is a propylene-based polymer.

[0017] The butene polymer is a polymer containing 50% by mass or more of structural units derived from 1-butene, and examples thereof include 1-butene homopolymer, 1-butene-ethylene copolymer, 1-butene-propylene copolymer, 1-butene-1-hexene copolymer, 1-butene-1-octene copolymer, 1-butene-ethylene-propylene copolymer, 1-butene-ethylene-1-hexene copolymer, 1-butene-ethylene-1-octene copolymer, 1-butene-propylene-1-hexene copolymer, and 1-butene-propylene-1-octene copolymer. The butene polymer may be a combination of two or more butene polymers.

[0018] The above olefin polymer A can be produced by a known polymerization method using a known polymerization catalyst.

[0019] The melt mass flow rate (MFR) of the olefin polymer A measured according to JIS K7210-2014 at a temperature of 230° C. or 190° C. and a load of 2.16 kgf is preferably 0.1 g / 10 min or more and 200 g / 10 min or less.

[0020] <Aliphatic polyester polymer B> The aliphatic polyester polymer has a structure of a polycondensation product of an aliphatic polycarboxylic acid component and an aliphatic polyhydric alcohol component, or a polycondensation product of an aliphatic hydroxycarboxylic acid, and the main chain of the repeating unit does not contain an aromatic hydrocarbon structure.

[0021] Examples of the aliphatic polyester polymer include a polymer of a hydroxycarboxylic acid or lactone, a polycondensate of a diol and a dicarboxylic acid, and a copolymer thereof. When the aliphatic polyester polymer B is a copolymer, the arrangement of the copolymer may be any of a random copolymer, an alternating copolymer, a block copolymer, a graft copolymer, and the like.

[0022] At least a part of these may be crosslinked with a crosslinking agent such as a polyisocyanate such as xylylene diisocyanate, 2,4-tolylene diisocyanate, etc., or a polysaccharide such as cellulose, acetyl cellulose, ethyl cellulose, etc. Furthermore, at least a part of these may have any structure such as a linear, cyclic, branched, star-shaped, or three-dimensional network structure, without any limitation, and may be a copolymer with a polyolefin resin or a graft polymer with a polyolefin resin.

[0023] Moreover, the aliphatic polyester polymer B can be used alone or in combination.

[0024] Examples of the hydroxycarboxylic acid include hydroxycarboxylic acids having 2 to 18 carbon atoms, preferably 6 or less carbon atoms, and most preferably 4 carbon atoms. Specific examples include glycolic acid, L-lactic acid, D-lactic acid, D,L-lactic acid, 3-hydroxybutyrate, 3-hydroxyvalerate, 3-hydroxypropionate, 4-hydroxybutyrate, 4-hydroxyvalerate, 5-hydroxyvalerate, 3-hydroxypentenoate, 3-hydroxyhexanoate, 3-hydroxyheptanoate, 3-hydroxyoctanoate, 3-hydroxynonanoate, and 3-hydroxydecanoate.

[0025] Examples of lactones include propiolactone, butyrolactone, valerolactone, caprolactone, and laurolactone.

[0026] The diol is preferably a diol having 2 to 10 carbon atoms. Among them, an aliphatic diol having 2 to 4 carbon atoms or an alicyclic diol having 5 or 6 carbon atoms is more preferable. Specific examples thereof include ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,2-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 1,10-decanediol, 1,12-dodecanediol, 1,14-tetradecanediol, 1,16-hexadecanediol, 1,18-octadecanediol, 1,2-cyclohexanediol, 1,4-cyclohexanediol, 1,2-cyclohexanedimethylol, and 1,4-cyclohexanedimethylol.

[0027] The dicarboxylic acid is preferably an aliphatic dicarboxylic acid having 2 to 12 carbon atoms. Among them, an aliphatic dicarboxylic acid having 2 to 6 carbon atoms or an alicyclic dicarboxylic acid having 5 to 6 carbon atoms is more preferable. Specific examples include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecadicarboxylic acid, dodecadicarboxylic acid, 1,14-tetradecanedicarboxylic acid, 1,16-hexadecanedicarboxylic acid, 1,18-octadecanedicarboxylic acid, dimer acid and its hydrogenated products, hexahydrophthalic acid, hexahydroisophthalic acid, and hexahydroterephthalic acid. These dicarboxylic acids may also be derivatives such as alkyl esters and acid anhydrides having 1 to 4 carbon atoms.

[0028] Of the above aliphatic polyester polymers, it is preferable to use polylactic acid, polybutylene succinate, poly(butylene succinate-co-butylene adipate), polycaprolactone, poly(3-hydroxybutyrate), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), and polyglycolic acid.

[0029] When polylactic acid is used as the aliphatic polyester polymer B, the polylactic acid preferably has an L-form ratio of 94 mol % or more in the lactic acid components constituting the polylactic acid. By setting the L-form ratio in this range, it is possible to prevent a decrease in the melting point.

[0030] <Polyhydroxyalkanoate polymer> The aliphatic polyester polymer B may be a polyhydroxyalkanoate polymer. A polyhydroxyalkanoate polymer is a polyester of a hydroxyalkanoic acid. Examples of the hydroxyalkanoic acid include 2-hydroxyalkanoic acid, 3-hydroxyalkanoic acid, and 4-hydroxyalkanoic acid.

[0031] Examples of 2-hydroxyalkanoic acids are glycolic acid, lactic acid, and 2-hydroxybutyric acid. Examples of polyesters of 2-hydroxyalkanoic acids, i.e., poly(2-hydroxyalkanoate)-based polymers, are polyglycolic acid and polylactic acid.

[0032] Examples of 3-hydroxyalkanoic acid are 3-hydroxybutyric acid, 3-hydroxypropionic acid, 3-hydroxypentanoic acid, and 3-hydroxyhexanoic acid. Polyesters of 3-hydroxyalkanoic acid, i.e., poly(3-hydroxyalkanoate)-based polymers, will be described in detail later.

[0033] Examples of 4-hydroxyalkanoic acids are 4-hydroxybutyric acid, 4-hydroxypentanoic acid, and 4-hydroxyhexanoic acid.

[0034] The polyhydroxyalkanoate polymer may be a homopolymer of a hydroxyalkanoic acid, or a polymer of two or more kinds of hydroxyalkanoic acids.

[0035] (Poly(3-hydroxyalkanoate) polymer) The aliphatic polyester polymer B can be a poly(3-hydroxyalkanoate) polymer.

[0036] The poly(3-hydroxyalkanoate) polymer is a polyhydroxyalkanoate, i.e., a polycondensate (polyester) of hydroxyalkanoic acid, and necessarily contains a repeating unit of 3-hydroxyalkanoate represented by formula (1). In formula (1), R is a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyano group, an amino group having 1 to 11 carbon atoms, an alkoxy group (alkyloxy group) having 1 to 11 carbon atoms, an amide group having 2 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a monovalent heterocyclic group having 1 to 9 carbon atoms. These groups may have a substituent. In particular, from the viewpoint of compatibility with components other than the aliphatic polyester polymer B contained in the composition (for example, the olefin polymer A), R is preferably an alkyl group having 1 to 8 carbon atoms, an amide group having 1 to 20 carbon atoms, or an aryl group having 6 to 8 carbon atoms.

[0037] [-O-CHR-CH 2 -CO-]…(1)

[0038] Examples of halogen atoms are F, Cl, Br, and I.

[0039] The alkyl group having 1 to 15 carbon atoms may be linear or branched. The number of carbon atoms in the alkyl group is preferably 1 to 8, and more preferably 1 to 4. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an isopentyl group, a 2-methylbutyl group, a 1-methylbutyl group, a hexyl group, an isohexyl group, a 3-methylpentyl group, a 2-methylpentyl group, a 1-methylpentyl group, a heptyl group, an octyl group, an isooctyl group, a 2-ethylhexyl group, a 3,7-dimethyloctyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tetradecyl group, and a pentadecyl group.

[0040] Examples of the amino group having 1 to 18 carbon atoms include an amino group, an alkylamino group, a dialkylamino group, an arylamino group, an alkylarylamino group, a benzylamino group, and a dibenzylamino group.

[0041] Examples of the alkylamino group include a methylamino group, an ethylamino group, a propylamino group, a butylamino group, a pentylamino group, a hexylamino group, a heptylamino group, an octylamino group, a nonylamino group, a decylamino group, a dodecylamino group, an isopropylamino group, an isobutylamino group, an isopentylamino group, a sec-butylamino group, a tert-butylamino group, a sec-pentylamino group, a tert-pentylamino group, a tert-octylamino group, a neopentylamino group, a cyclopropylamino group, a cyclobutylamino group, a cyclopentylamino group, a cyclohexylamino group, a cycloheptylamino group, a cyclooctylamino group, a 1-adamantamino group, and a 2-adamantamino group.

[0042] Examples of dialkylamino groups include a dimethylamino group, a diethylamino group, a dipropylamino group, a dibutylamino group, a dipentylamino group, a diisopropylamino group, a diisobutylamino group, a diisopentylamino group, a methylethylamino group, a methylpropylamino group, a methylbutylamino group, a methylisobutylamino group, a dicyclopropylamino group, a pyrrolidino group, a piperidino group, and a piperazino group.

[0043] Examples of the arylamino group include an anilino group, a 1-naphthylamino group, a 2-naphthylamino group, an o-toluidino group, a m-toluidino group, a p-toluidino group, a 1-fluoreneamino group, a 2-fluoreneamino group, a 2-thiazoleamino group, and a p-terphenylamino group.

[0044] The alkylarylamino group includes an N-methylanilino group, an N-ethylanilino group, an N-propylanilino group, an N-butylanilino group, an N-isopropylanilino group, and an N-pentylanilino group.

[0045] Examples of the alkoxy group having 1 to 11 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, an isobutoxy group, a sec-butoxy group, a tert-butoxy group, a cyclopropoxy group, a cyclobutoxy group, and a cyclopentoxy group.

[0046] The term "amide group" refers to a group in which one hydrogen atom bonded to a nitrogen atom has been removed from a carboxylic acid amide. Examples of the amide group having 1 to 20 carbon atoms include -NH-C(=O)-R groups such as formamide, acetamide, propionamide, butylamide, benzamide, trifluoroacetamide, and pentafluorobenzamide. A (wherein R A is a hydrogen atom or a monovalent organic group), and -N(-C(=O)-R such as a diformamide group, a diacetamide group, a dipropionamide group, a dibutyroamide group, a dibenzamide group, a ditrifluoroacetamide group, and a dipentafluorobenzamide group. A )(-C(=O)-R B ) (wherein R A 、 R B are each independently a hydrogen atom or a monovalent organic group. The organic group may be an alkyl group, an alkoxy group, or an aryl group, which may be substituted with a halogen atom. Among these, the amide group is preferably a formamide group, an acetamide group, a propionamide group, a butyroamide group, or a benzamide group.

[0047] Examples of the aryl group having 6 to 12 carbon atoms are a phenyl group, a tolyl group, a xylyl group, a naphthyl group, and a biphenyl group, and among these, a phenyl group, a tolyl group, and a xylyl group are more preferred.

[0048] Examples of heteroatoms in the monovalent heterocyclic group having 1 to 9 carbon atoms are N, O, and S, and the group may be saturated or unsaturated, may have a single or multiple heteroatoms, or may have different types of heteroatoms. Examples of such heterocyclic groups include a thienyl group, a pyrrolyl group, a furyl group, a pyridyl group, a piperidinyl group, a quinolinyl group, an isoquinolinyl group, a pyrimidinyl group, a triazinyl group, and a thiazolyl group.

[0049] The repeating units of the aliphatic polyester polymer B may consist solely of one or more types of 3-hydroxyalkanoates represented by formula (1), or may have one or more types of 3-hydroxyalkanoates represented by formula (1) and one or more types of other hydroxyalkanoates.

[0050] Aliphatic polyester polymer B preferably contains 3-hydroxyalkanoate repeating units represented by formula (1) in an amount of 50 mol % or more, more preferably 70 mol % or more, based on the total repeating units of hydroxyalkanoate (100 mol %).

[0051] Examples of 3-hydroxyalkanoates represented by formula (1) are those in which R is a hydrogen atom or C n H 2n+1 where n is an integer of 1 to 15, examples of the alkyl group include 3-hydroxybutyrate (hereinafter, may be referred to as 3HB) where n=1, 3-hydroxyvalerate (hereinafter, may be referred to as 3HV) where n=2, 3-hydroxyhexanoate (hereinafter, may be referred to as 3HH) where n=3, 3-hydroxyoctanate where n=5, 3-hydroxyoctadecanate where n=15, and 3-hydroxypropionate where R is a hydrogen atom.

[0052] An example of the polymer B having only one type of repeating unit represented by formula (1) is poly(3-hydroxybutyrate) (hereinafter, sometimes referred to as P3HB).

[0053] Examples of polymer B having only multiple types of repeating units represented by formula (1) are poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (hereinafter, sometimes referred to as P3HB3HH), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (hereinafter, sometimes referred to as P3HB3HV), and poly(3-hydroxybutyrate-co-3-hydroxypropionate) (hereinafter, sometimes referred to as P3HB3HP).

[0054] Examples of hydroxyalkanoates other than the 3-hydroxyalkanoate represented by formula (1) include the repeating unit represented by formula (2) (wherein R 1 is a hydrogen atom or C n H 2n+1 where n is an integer of 1 or more and 15 or less, and m is an integer of 2 to 10.

[0055] [-O-CHR 1 -C m H 2m+1 -CO-]…(2)

[0056] An example of polymer B containing repeating units of formulae (1) and (2) is poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (for example, formula (P3HB4HB) below).

[0057] From the viewpoint of increasing the melting point, it is preferable that the repeating unit of the aliphatic polyester polymer B contains at least 3-hydroxybutyrate among the 3-hydroxyalkanoates represented by the formula (1).

[0058] The aliphatic polyester polymer B preferably contains 3-hydroxybutyrate repeating units in an amount of 50 mol % or more, more preferably 70 mol % or more, based on the total repeating units of hydroxyalkanoate (100 mol %).

[0059] The aliphatic polyester polymer B may have two or more types of ester repeating units, and may be, for example, a di-polymer having two types of repeating units, a tri-copolymer having three types of repeating units, or a tetra-copolymer having four types of repeating units, as described above.

[0060] For example, an example of a tri-copolymer is poly(3-hydroxybutyrate-co-3-hydroxyvalerate-co-3-hydroxyhexanoate) (hereinafter, sometimes referred to as (P3HB3HV3HH)).

[0061] As described above, the aliphatic polyester polymer B preferably contains 3-hydroxybutyrate among the repeating units of 3-hydroxyalkanoate represented by formula (1). The proportion XX of the repeating units of 3-hydroxybutyrate relative to 100 moles of all the repeating units of hydroxyalkanoate ester is preferably 90 mol% or more, more preferably 95 mol% or more, and even more preferably 98.0 mol% or more.

[0062] The proportion XX is usually 100 mol % or less, preferably 99.9 mol % or less, and more preferably 99.8 mol % or less.

[0063] The arrangement of the copolymer may be any of a random copolymer, an alternating copolymer, a block copolymer, a graft copolymer, and the like.

[0064] The aliphatic polyester polymer B may have other ester repeating units than those of the formulae (1) and (2), but the main chain of the other ester repeating units does not contain an aromatic hydrocarbon structure. That is, the aliphatic polyester polymer B is an aliphatic polyester. However, it is possible that a group having an aromatic hydrocarbon group is bonded to a carbon of the main chain of the other ester repeating units.

[0065] The constituent ratio of the repeating units in the aliphatic polyester polymer B can be calculated from the results of NMR measurements such as 1H-NMR and 13C-NMR, as described in L. Tripathi., MCFactories, 11, 44 (2012).

[0066] Furthermore, the aliphatic polyester polymer B may be a mixture of two or more kinds of poly(3-hydroxyalkanoate) polymers.

[0067] The weight average molecular weight (Mw) of the aliphatic polyester polymer B can be 10,000 to 1,000,000, preferably 20,000 to 800,000, and more preferably 30,000 to 600,000. By making the weight average molecular weight (Mw) 10,000 or more, it is possible to obtain a molded product excellent in impact strength and tensile elongation. In addition, by making the weight average molecular weight 500,000 or less, the dispersibility in the olefin polymer A becomes good. The weight average molecular weight may be 400,000 or less, 300,000 or less, 200,000 or less, or 100,000 or less. In this specification, the weight average molecular weight (Mw) is measured by GPC using standard polystyrene as a molecular weight standard substance.

[0068] The aliphatic polyester polymer B is a thermoplastic resin and may be crystalline.

[0069] The melt mass flow rate (MFR(B)) of the aliphatic polyester polymer B measured according to JIS K7210-2014 at a temperature of 190°C or 170°C and a load of 2.16 kgf is preferably 0.1 g / 10 min or more and 200 g / 10 min or less. MFR(B) may be 1 g / 10 min or more, 3 g / 10 min or more, 5 g / 10 min or more, 7 g / 10 min or more, 8 g / 10 min or more, 10 g / 10 min or more, or 20 g / 10 min or more. MFR(B) may be 150 g / 10 min or less, or 100 g / 10 min or less.

[0070] The melting point (Tm) of the aliphatic polyester polymer B is preferably 150° C. or higher, and may be 155° C. or higher, 160° C. or higher, 165° C. or higher, 170° C. or higher, or 175° C. or higher. The melting point (Tm) of the polymer B may be 220° C. or lower, may be 200° C. or lower, or may be 190° C. or lower.

[0071] The melting point (Tm) of the aliphatic polyester polymer B is measured from the position of the main peak due to the melting of crystals as determined by differential scanning calorimetry (DSC) in accordance with JIS K7121.

[0072] Poly(3-hydroxyalkanoate) polymers may be produced by microorganisms or may be derived from compounds (eg, cyclic lactones) derived from petroleum or plant sources.

[0073] The poly(3-hydroxyalkanoate) polymer may be one in which each repeating unit of hydroxyalkanoate is composed only of the D-form (R-form), such as in one produced from a microorganism, or may be one in which the repeating unit of hydroxyalkanoate contains both the D-form (R-form) and the L-form (S-form), such as in one derived from a mixture of the D-form (R-form) and the L-form (S-form).

[0074] In the poly(3-hydroxyalkanoate) polymer produced from a microorganism, the repeating unit of formula (1) can be expressed as follows: (BI-1) In formula (BI-1), n ​​represents the degree of polymerization.

[0075] [ka]

[0076] For example, poly-(3-hydroxybutyrate) produced from a microorganism has the following structure: (BI-2) where n represents the degree of polymerization.

[0077] [ka]

[0078] Also, poly-(3-hydroxybutyrate-co-3-hydroxyhexanoate) produced from a microorganism has the following structure: (BI-3) where m and n represent the degree of polymerization.

[0079] [ka]

[0080] Furthermore, poly-(3-hydroxybutyrate-co-4-hydroxybutyrate) produced from microorganisms has the following structure: (BI-4) where m and n represent the degree of polymerization.

[0081] [ka]

[0082] The aliphatic polyester polymer B can be biodegradable.

[0083] For example, poly(3-hydroxyalkanoate) polymers can be produced by microorganisms such as Alcaligeneseutrophus AC32 strain, which is an Alcaligeneseutrophus strain into which a PHA synthase gene derived from Aeromonas caviae has been introduced (international deposit under the Budapest Treaty, international depository authority: National Institute of Advanced Industrial Science and Technology Patent Organism Depositary Center (6-1-1 Central, Higashi 1-chome, Tsukuba City, Ibaraki Prefecture, Japan), original deposit date: August 12, 1996, transferred on August 7, 1997, accession number FERMBP-6038 (transferred from original deposit FERMP-15786)) (J. Bacteriol., 179, 4821 (1997)).

[0084] <Composition of Resin Composition> The resin composition in the resin composition molded product contains 50% by mass or more of the olefin polymer A. The resin composition does not need to contain the aliphatic polyester polymer B, but it is preferable that the resin composition contains the aliphatic polyester polymer B. The resin composition may consist of only the olefin polymer A.

[0085] When the resin composition contains an aliphatic polyester polymer B, the content of the olefin polymer A may be 51 to 99.9 parts by mass, and the content of the aliphatic polyester polymer B may be 0.1 to 49 parts by mass, relative to 100 parts by mass in total of the olefin polymer A and the aliphatic polyester polymer B.

[0086] When the resin composition contains an aliphatic polyester polymer B, the content of the olefin polymer A may be 60.1 to 99.9 parts by mass and the content of the aliphatic polyester polymer B may be 0.1 to 39.9 parts by mass, the content of the olefin polymer A may be 70 to 99.9 parts by mass and the content of the aliphatic polyester polymer B may be 0.1 to 30 parts by mass, or the content of the olefin polymer A may be 75 to 99.9 parts by mass and the content of the aliphatic polyester polymer B may be 0.1 to 25 parts by mass, relative to 100 parts by mass in total of the olefin polymer A and the aliphatic polyester polymer B.

[0087] When the resin composition contains an aliphatic polyester polymer B, the content of the olefin polymer A may be 80 to 99.9 parts by mass and the content of the aliphatic polyester polymer B may be 0.1 to 20 parts by mass, the content of the olefin polymer A may be 85 to 99.9 parts by mass and the content of the aliphatic polyester polymer B may be 0.1 to 15 parts by mass, or the content of the olefin polymer A may be 90 to 99.9 parts by mass and the content of the aliphatic polyester polymer B may be 0.1 to 10 parts by mass, relative to 100 parts by mass in total of the olefin polymer A and the aliphatic polyester polymer B.

[0088] The total proportion of the olefin polymer A and the aliphatic polyester polymer B in the entire resin composition can be more than 50 mass%, preferably 60 mass% or more, and more preferably 70 mass% or more.

[0089] In the resin composition, the aliphatic polyester polymer B may or may not form a dispersed phase. The aliphatic polyester polymer B forming a dispersed phase means that the resin composition has a sea-island structure in which the olefin polymer A is a continuous phase (sea portion) and the aliphatic polyester polymer B is a dispersed phase (island portion). The average equivalent circle diameter of the dispersed phase (island portion) can be 10 nm to 400 μm.

[0090] (Additives) The resin composition may contain additives as necessary, which may be at least one selected from the group consisting of stabilizers, antibacterial agents, antifungal agents, dispersants, plasticizers, flame retardants, tackifiers, colorants, metal powders, organic powders, inorganic fibers, organic fibers, organic and inorganic composite fibers, inorganic whiskers, and fillers.

[0091] Examples of the stabilizer include at least one selected from the group consisting of lubricants, antioxidants, heat stabilizers, light resistance agents, weather resistance agents, metal deactivators, ultraviolet absorbers, light stabilizers, and copper damage inhibitors. Examples of the light resistance agent include hindered amine-based light resistance agents.

[0092] An example of the colorant is at least one selected from the group consisting of titanium oxide, carbon black, and organic pigments. An example of the metal powder is ferrite.

[0093] An example of an organic powder is a protein. Examples of inorganic fibers are glass fibers and metal fibers. Examples of organic fibers are carbon fibers and aramid fibers. An example of an inorganic whisker is potassium titanate whisker.

[0094] Examples of the filler include at least one selected from the group consisting of glass beads, glass balloons, glass flakes, asbestos, mica, calcium carbonate, talc, silica, calcium silicate, hydrotalcite, kaolin, diatomaceous earth, graphite, pumice, ebonized powder, cotton flock, cork powder, barium sulfate, fluororesin, cellulose powder, and wood flour.

[0095] The resin composition may contain only one type of the above additives, or may contain a combination of two or more types.

[0096] In the resin composition, the additive may be contained in either the olefin polymer A or the aliphatic polyester polymer B. The additive may form a dispersed phase in the continuous phase of the olefin polymer A, separate from the aliphatic polyester polymer B.

[0097] (Shape of resin composition molded body) The shape of the resin composition molded article is not particularly limited, and examples thereof include plates, films, fibers, cloth, nonwoven fabrics, containers, tubes, etc. Furthermore, molded articles of any complex shape can be produced by injection molding or the like.

[0098] (Surface condition of resin composition molded body) The surface of the resin composition molded article satisfies the following requirements (i) and (ii).

[0099] (i): The amount of oxygen atoms on the surface of the resin composition molded product determined by X-ray photoelectron spectroscopy is 0.01 atom% or more and 8.5 atom% or less. The amount of oxygen atoms may be 0.05 atom% or more, 0.10 atom% or more, or 0.20 atom% or more. The amount of oxygen atoms may be 8.0 atom% or less, 5.0 atom% or less, 3 atom% or less, 2.0 atom% or less, or 1.0 atom% or less.

[0100] (ii): The surface of the resin composition molded article has a wet tension of 25 mN / m or more and 45 mN / m or less. In this specification, the wet tension is the wet tension defined in JIS K6768 1999. This wet tension may be 27 mN / m or more, 29 mN / m or more, or 30 mN / m or more. The wet tension may be 40 mN / m or less, or 37 mN / m or less.

[0101] The resin composition molded article according to this embodiment, which satisfies requirements (i) and (ii), has an excellent balance between the oxygen atomic weight on the surface and the wetting tension on the surface, and thus has high rigidity while enabling the adhesion of a resin film applied to the surface of the resin composition molded article to be increased.

[0102] The reason for this is not clear, but the following reasons are considered. If the amount of oxygen atoms on the surface is too small, the thickness of the primer layer decreases, and the adhesion to the resin film decreases, whereas if the amount of oxygen atoms on the surface is too large, the strength of the surface of the resin composition molded article is likely to decrease.

[0103] If the surface wet tension is too high, the thickness of the primer layer decreases, and the adhesion to the resin film decreases. If the surface wet tension is too low, the uniformity of the thickness of the primer layer tends to decrease, and the uniformity of the adhesion to the resin film tends to decrease.

[0104] It is preferable that the surface of the resin composition molded article further satisfies the following requirement (iii). (iii): In the infrared absorption spectrum of the surface of the molded product of the resin composition measured by an infrared spectrophotometer, the ratio RCO / RCH of the peak intensity RCO of the stretching vibration of the C=O bond to the peak intensity RCH of the stretching vibration of the CH bond is 0.05 or more. This ratio RCO / RCH may be 0.07 or more, 0.10 or more, or 0.12 or more. There is no particular upper limit to this ratio RCO / RCH, but it may be 1.0 or less, 0.8 or less, or 0.5 or less.

[0105] Peak intensity RCO is 2700-3000cm -1 In the IR absorption spectrum of the surface of the resin composition molded product, which is base-corrected in the range of 2700 to 3000 cm -1 This is the maximum absorbance of the peak observed at 100 nm, which corresponds to the carbonyl C=O stretching vibration intensity.

[0106] The peak intensity RCH is 1600-1800 cm -1 In the IR absorption spectrum of the surface of the resin composition molded product, which is base-corrected in the range of 1600 to 1800 cm -1 This is the maximum absorbance of the peak observed at 100 nm, and corresponds to the CH stretching vibration peak intensity of alkanes.

[0107] The IR spectrum of the surface of the resin composition molded article can be obtained by the attenuated total reflection (ATR) method using an FTIR device.

[0108] An RCO / RCH ratio of 0.05 or more means that a certain amount of C=O bonds are present on the surface of the resin composition molded article. It is believed that C=O bonds contribute more to adhesion to the resin film than OH bonds, and that satisfying formula (iii) improves the adhesion of the resin film.

[0109] (Method of manufacturing resin composition molded article) The above-mentioned resin composition molded article can be obtained by molding the resin composition having the above-mentioned composition by a known method.

[0110] The resin composition can be obtained by melt-kneading the olefin polymer A, the aliphatic polyester polymer B which is blended as necessary, and additives which are added as necessary. The kneading temperature (the set temperature of the kneader) is preferably 150 to 300° C., more preferably 170 to 280° C. Alternatively, a pre-kneaded mixture can be obtained by melt-kneading each of a portion of the olefin polymer A and the aliphatic polyester polymer B, and then the remaining portions of the olefin polymer A and the aliphatic polyester polymer B are added to the pre-kneaded mixture and further melt-kneaded to obtain the composition.

[0111] Subsequently, the obtained resin composition can be subjected to a known resin molding method such as injection molding, extrusion molding, vacuum molding, pressure molding, press molding, foam molding, blow molding, or rotational molding to obtain a molded article of the above composition having a required shape.

[0112] From the viewpoint of adhesion of the resin film applied to the surface of the molded article, i.e., paintability and printability, the molding method is preferably injection molding, extrusion molding, blow molding, or rotational molding, and more preferably injection molding or extrusion molding. By extrusion molding, films, plates, fibers, etc. can be formed.

[0113] From the viewpoint of the adhesion of the resin film applied to the surface of the molded article, i.e., paintability and printability, the maximum shear rate during the heat molding process to obtain a molded article of the composition of the present invention is 1 to 10,000 sec -1is preferable, and more preferably 10 to 5000 sec -1 , and even more preferably 15 to 3000 sec -1 It is.

[0114] Moreover, the above composition can be laminated with other materials such as other resins, metals, paper, leather, etc. to obtain a multi-layer structure.

[0115] The surface of the article molded from the composition of the present invention may be subjected to a surface treatment such as embossing, corona discharge treatment, flame treatment, plasma treatment, ozone treatment, etc.

[0116] Applications of the molded article of the resin composition of the present invention include textile materials, exterior construction members, furniture and interior decoration members, house members, toy members, gardening members, automobile members, and packaging materials. Examples of the textile materials include fabric materials for clothing, fabric materials for interior use, and textile materials for industrial use. Examples of the exterior materials include carport materials, fence materials, gate materials, gatepost materials, post materials, cycle port materials, deck materials, sunroom materials, roof materials, terrace materials, handrail materials, shade materials, and awning materials. Examples of the furniture and interior decoration materials include sofa materials, table materials, chair materials, bed materials, chest materials, cab net materials, and dresser materials. Examples of the home appliance materials include clock materials, mobile phone materials, and white goods home appliance materials. Examples of the toy materials include plastic model materials, diorama materials, and video game main body materials. Examples of the gardening materials include planter materials, flower vase materials, and flower pot materials. Examples of the automobile materials include bumper materials, instrument panel materials, and airbag cover materials. Examples of the packaging materials include food packaging materials, fiber packaging materials, and miscellaneous goods packaging materials. Further, other applications include, for example, monitor parts, office automation (OA) equipment parts, medical parts, drainage pans, toiletry parts, bottles, containers, snow removal equipment parts, and various construction parts.

[0117] (Resin film-applied resin composition molded body) As shown in FIG. 1, the resin film-applied resin composition molded body 100 has the above-mentioned resin composition molded body 10 and a resin film 20 provided on at least a part of the surface of the resin composition molded body 10 .

[0118] The resin film 20 includes a film containing a resin. The resin film 20 preferably has a primer layer 22 in contact with the surface of the resin composition molded body 10 .

[0119] The material of the primer layer 22 is not particularly limited, but may include, for example, chlorinated polyolefin resins such as chlorinated polyethylene and chlorinated polypropylene, and maleated polyolefin resins obtained by modifying polyethylene resins and chlorinated polyolefin resins with maleic acid. The resin film 20 preferably has an overcoat layer 23 on the primer layer 22. The overcoat layer 23 may be a single layer or may have multiple layers. For example, the overcoat layer 23 may include, in order from the primer layer 22 side, a base layer 24 and a clear layer 26 as shown in Fig. 1, and such a configuration of the overcoat layer may be called a coating film.

[0120] The material of the base layer 24 is not particularly limited, but may include, for example, resins such as ethyl methacrylate-based resins, methyl methacrylate-based resins, urethane-based resins, epoxy-based resins, ester-based resins, olefin-based resins, fluorine-based resins, silicone-based resins, styrene-based resins, and melamine-based resins; pigments such as metal particles such as aluminum and mineral particles such as mica; and various additives.

[0121] The material of the clear layer 26 is not particularly limited, but may include, for example, resins such as ethyl methacrylate-based resins, methyl methacrylate-based resins, urethane-based resins, epoxy-based resins, ester-based resins, olefin-based resins, fluorine-based resins, silicone-based resins, styrene-based resins, and melamine-based resins; and various additives.

[0122] To obtain such a resin film-applied resin composition molded body, a primer layer forming liquid (a liquid in which a primer resin is dissolved / dispersed in a solvent (toluene, isopropyl alcohol, etc.)) is applied to the surface of the above-mentioned resin composition molded body and dried, then a base layer forming paint is applied onto the primer layer and dried, and then a clear layer forming paint is applied onto the base layer and dried.

[0123] When the topcoat layer 23 has a base layer 24 and a clear layer 26, there may be a plurality of base layers 24, or a plurality of clear layers 26. In addition, the topcoat layer 23 may have only one of the base layer 24 and the clear layer 26.

[0124] The base layer 24 of the overcoat layer 23 may include a resin and a colorant selected from the group consisting of dyes and pigments, and such a base layer may be called an ink film. The overcoat layer 23 may include a single base layer 24 including a resin and a colorant, or may include multiple base layers 24 including a resin and a colorant, and may or may not include a clear layer 26.

[0125] Examples of the resin of the base layer containing the resin and colorant include ethyl methacrylate-based resin, methyl methacrylate-based resin, urethane-based resin, epoxy-based resin, ester-based resin, olefin-based resin, fluorine-based resin, silicone-based resin, styrene-based resin, and melamine-based resin.

[0126] Examples of dyes and pigments are carbon black, zinc oxide, white lead, lithopone, titanium dioxide, precipitated barium sulfate and baryte powder, red lead, iron oxide red, yellow lead, zinc yellow type 1, zinc yellow type 2, ultramarine blue, potassium ferric ferrocyanide, YInMn blue, organic pigments, polycyclic pigments, azo pigments, lake pigments, and fluorescent pigments.

[0127] Examples of the dye include acid dyes, basic dyes, direct dyes, sulfur dyes, vat dyes, naphthol dyes, reactive dyes, disperse dyes, etc., and can be selected from dyes that are conventionally known for use in color filters. Examples of the dye include pigments described in JP-A-64-90403, JP-A-64-91102, JP-A-1-94301, JP-A-6-11614, JP-T-2592207, U.S. Pat. No. 4,808,501, U.S. Pat. No. 5,667,920, U.S. Pat. No. 5,059,500, JP-A-5-333207, JP-A-6-35183, JP-A-6-51115, JP-A-6-194828, etc. Examples of the chemical structure of the dye include pyrazole azo, anilino azo, aryl azo, pyrazolotriazole azo, pyridone azo, triphenylmethane, anthraquinone, anthrapyridone, benzylidene, oxonol, cyanine, polymethine, phenothiazine, pyrrolopyrazole azomethine, xanthene, phthalocyanine, quinophthalone, benzopyran, indigo, dioxazine, coumarin, and squarylium dyes, of which preferred are pyrazole azo, anilino azo, pyrazolotriazole azo, pyridone azo, anthraquinone, anthrapyridone, phthalocyanine, dioxazine, quinophthalone, and xanthene dyes, and more preferred are pyrazole azo, pyridone azo, phthalocyanine, quinophthalone, and xanthene dyes.

[0128] Such a resin film 20 can be obtained by applying a primer layer forming liquid (a liquid in which a primer resin is dissolved / dispersed in a solvent (toluene, isopropyl alcohol, etc.)) to the surface of a resin composition molded body, drying it, and then printing an ink raw material containing a resin, a colorant, and a solvent on the primer layer, and drying it.

[0129] There is no particular limitation on the thickness of the resin film 20, but it may be 0.01 to 100 μm. The thickness of the primer layer 22 may be 0.001 to 50 μm. EXAMPLES

[0130] The present invention will be described below with reference to examples and comparative examples. The olefin polymer A and the aliphatic polyester polymer B used in the examples and comparative examples are shown below.

[0131] (1) Olefin Polymer A (A-1) Propylene homopolymer MFR (230℃, 2.16kg load): 20g / 10min Melting point (Tm): 163℃

[0132] (2) Aliphatic polyester polymer B (B-1) Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) Structural formula: (BI-3) formula Comonomer (3HH) component content (mol%): 0.2 mol% Weight average molecular weight (Mw): 104000 MFR (190℃, 2.16kg load): 7.8g / 10min Melting point (Tm): 175℃

[0133] The physical properties of each polymer and composition were measured according to the methods shown below.

[0134] (1) Melt mass flow rate (MFR, unit: g / 10 min) Measurements were performed according to the method specified in JIS K7210-2014. The measurement temperature was 230°C or 190°C, and the load was 2.16 kg.

[0135] (2) Weight average molecular weight (Mw) The weight average molecular weight (Mw) was calculated based on the results of gel permeation chromatography (GPC). In the GPC measurement, a Waters GPC-150C was used as the measuring device, an orthodichlorobenzene solution with a polymer concentration of 0.05% by weight was used, and a mixed polystyrene gel column (Tosoh PSKgelGMH6-HT) was used as the column, and the measurement temperature was 135°C.

[0136] (3) Melting point of polymer (Tm) The measurement was performed according to the method specified in JIS K7121. The measurement temperature was −50° C. to 200° C. or −50° C. to 250° C., and the temperature rise rate was 10° C. / min.

[0137] (4) Content of comonomer component in aliphatic polyester polymer B The content of the comonomer component refers to the molar ratio of repeating units other than 3-hydroxybutyrate (3-hydroxyhexanoate (3HH) or 4-hydroxybutyrate (4HB)) to the total number of ester repeating units of hydroxyalkanoate in polymer B.

[0138] The content of the comonomer component was determined by the method using 1H-NMR spectrum described in L. Tripathi., MCFactories, 11, 44 (2012). [Measurement conditions] Model: Bruker AVANCE600 Probe: 10mm cryoprobe Measurement temperature: 135℃ Pulse repetition time: 1 second Pulse width: 45° Number of times: 700 Magnetic field strength: 600MHz

[0139] (5) Measurement of Tg of composition A temperature-storage modulus curve of the composition was obtained using a viscoelasticity device (SII Nano Technology Co., Ltd.; DMS200), and the number of peaks was counted.

[0140] (6) Oxygen Atom Quantity on the Surface of the Resin Composition Molded Product The amount of oxygen atoms on the surface of the resin composition molded product was measured using an X-ray photoelectron spectroscopy device, AXIS ULTRA DLD, manufactured by Shimadzu Corporation / KRATOS. The degree of vacuum in the device during the measurement was 10 -8 ~10 -9The X-ray source was set to a range of 1000 torr. The excitation light was monochromatic Al Kα (1486.6 eV), the output was 10 mA tube current, 15 kV tube voltage, and the photoelectron take-off angle was 0°. After charging correction based on the binding energy of the carbon 1s level (1486.6 eV), the spectrum background was removed by the Shirley method. Peak separation was performed on the oxygen atomic components of the obtained carbon 1s narrow spectrum using a Gauss-Lorentz composite function (Lorentz function ratio: 30%). [Measurement conditions] Equipment: X-ray photoelectron spectroscopy equipment (Shimadzu / KRATOS AXIS ULTRA DLD) Light source: Monochromatic Al Kα (1486.6eV) Tube current: 10mA Tube voltage: 15kV Vacuum degree inside the device: 10 -8 ~10 -9 toor Neutralization Gun: Use Spot size: 300μm×700μm Scan mode (elements): Narrow (C1s, O1s, P2p) Pass energy: 20 eV Step: 0.1 eV Dwell time:260ms(C1s), 332(O1s), 426(P2p) Accumulation count: 5 times (C1s), 10 times (O1s), 20 times (P2p) Charge correction: Carbon 1s level binding energy (284.6 eV) Background: Shirley Method

[0141] (7) Ratio RCO / RCH Using a JASCO FT / IR 6200 infrared spectrophotometer, infrared spectroscopy was performed on the surface of the resin composition molded body by the attenuated total reflection (ATR) method according to the measurement procedure described below, and the value was calculated from the obtained IR spectrum using the formula XXX. [Measurement conditions] Measurement mode: ATR method Prism: Diamond Measurement wavelength: 600~4000cm -1 Number of times accumulated: 64 RCO / RCH=2700~3000cm -1 In the base-corrected IR spectrum in the range of 2700-3000 cm -1 Maximum absorbance of the peak observed at (carbonyl C=O stretching vibration intensity) / 1600~1800cm -1 In the base-corrected IR spectrum in the range of 1600-1800 cm -1 Maximum absorbance of the peak observed in (peak intensity of CH stretching vibration of alkane) …XXX

[0142] (9) Wetting tension The wetting tension was measured by dropping wetting reagents (mixtures for wetting tension test, manufactured by Wako Pure Chemical Industries, Ltd.) having various wetting tensions on the surface of the resin composition molded body, spreading the wetting reagents with a cotton swab, and visually observing the spreading of the reagent. Specifically, first, mixture No. 65.0 for wetting tension test, which has a wetting tension of 65 mN / m, was dropped on the surface of the molded body and spread with a cotton swab. The state of the reagent was visually observed 20 seconds after spreading. If the reagent was repelled, the test was repeated in the same manner using mixtures for wetting tension test, each having a smaller wetting tension in each step, until the reagent was no longer repelled. The wetting tension of the reagent used when it was no longer repelled was taken as the value of the wetting tension.

[0143] (10) Initial adhesion <Painting conditions> For the initial adhesion, a primer (Kansai Paint Plastic Primer (NE)) was sprayed (dry film thickness 6 μm) on the surface of the resin composition molded body using a low pressure spray gun (ANEST IWATA LPH101-S34) under an air pressure of 0.1 MPa, and dried at 60 ° C for 3 minutes. Then, a water-based base paint (Kansai Paint 202 Sun Metallic) was sprayed (dry film thickness 10 μm) using a spray gun (ANEST IWATA W101) under an air pressure of 0.25 MPa, and dried at 60 ° C for 3 minutes. On top of that, a clear paint (Kansai Paint HS Clear Base Base Base Agent, Kansai Paint HS Clear G Hardener, and Kansai Paint Thinner 30) was sprayed (dry film thickness 15 μm) using a spray gun (ANEST IWATA W101) under an air pressure of 0.15 MPa. Then, it was dried at 60 ° C for 60 minutes to form a multi-layer resin film.

[0144] <Evaluation conditions> A razor blade was used to carve 100 2 mm square grids (10 vertical x 10 horizontal) into the resin film of a resin composition molded product that had been formed into a multilayer resin film according to the coating conditions, and a 24 mm wide piece of Cellophane Tape (registered trademark) (manufactured by Nichiban Co., Ltd.) was then pressed onto the grid with the fingers. The end of the tape was then grasped and pulled off in one go, and the number of grids remaining was evaluated as the remaining rate (%).

[0145] <Flexural modulus> A Toyo Machinery Metal PLASTAR Si30 with a clamping force of 30 tons was used as the injection molding machine, and rectangular injection molded bodies measuring 80 mm x 10 mm x 4 mm in thickness were produced under conditions of a molding temperature of 210°C, an injection speed of 20 mm / sec, and a mold temperature of 50°C, and the bending modulus was measured according to JIS K7203. Specifically, the bending modulus was measured at a span length of 64 mm, a juice speed of 2.0 mm / min, and a measurement temperature of 23°C.

[0146] Example 1 5.0% by mass of polymer (B-1) and 95% by mass of polymer (A-1) were mixed, and melt-kneaded using a 15mm twin-screw extruder KZW15-45MG (manufactured by Technobel) under the conditions of cylinder set temperature: 210°C, screw rotation speed: 500 rpm, and extrusion rate: about 4 kg / hour to obtain a resin composition (Q-1). The resin composition (Q-1) raw material was molded into a plate shape using a 220 ton injection molding machine (IS220EN, manufactured by Toshiba Machine Co., Ltd.) under the conditions of cylinder set temperature: 210°C, injection speed: 31 mm / sec, thickness: 2 mm, length: 150 mm, and width: 70 mm to obtain a resin composition molded body.

[0147] Example 2 The same procedure as in Example 1 was carried out except that 10% by mass of the polymer (B-1) and 90% by mass of the polymer (A-2) were used.

[0148] Comparative Example 1 The same procedure as in Example 1 was repeated except that 100% by mass of the polymer (A-1) was used.

[0149] Comparative Example 2 Polymer (A-1) was melt-kneaded using a 15mm twin-screw extruder KZW15-45MG (manufactured by Technobel) under the conditions of cylinder set temperature: 210°C, screw rotation speed: 500 rpm, and extrusion rate: about 4 kg / hour to obtain resin composition (Q-1). The resin composition (Q-1) raw material was molded using a 220 ton injection molding machine (IS220EN, manufactured by Toshiba Machine Co., Ltd.) under the conditions of cylinder set temperature: 210°C, injection speed: 31 mm / sec, thickness: 2 mm, length: 150 mm, and width: 70 mm to obtain a resin composition molded body. The obtained resin composition molded body was subjected to plasma treatment using NVC-103 (manufactured by Nitto Denshi) under the conditions of oxygen gas-containing argon gas atmosphere, 100 W, and 5 minutes.

[0150] The results are shown in Table 1.

[0151] [Table 1] [Explanation of symbols]

[0152] 10...resin composition molded body, 20...resin film, 22...primer layer, 24...base layer, 26...clear layer, and 100...resin film-applied resin composition molded body.

Claims

1. A molded article of a resin composition containing 50% by mass or more of an olefin polymer A and satisfying the following requirements (i) to (ii): (i): The amount of oxygen atoms on the surface of the molded article of the resin composition, as determined by X-ray photoelectron spectroscopy, is 0.01 atom % or more and 8.5 atom % or less. (ii) The surface of the resin composition molded article has a wetting tension of 25 mN / m or more and 45 mN / m or less.

2. The molded article of the resin composition according to claim 1 , further satisfying the following requirement (iii): (iii): In an infrared absorption spectrum of the surface of the resin composition molded product measured with an infrared spectrophotometer, the ratio RCO / RCH of the peak intensity RCO of the stretching vibration of a C═O bond to the peak intensity RCH of the stretching vibration of a C—H bond is 0.05 or more.

3. The molded article of the resin composition according to claim 1 or 2, further comprising an aliphatic polyester polymer B.

4. The molded article of a resin composition according to claim 3, wherein the aliphatic polyester polymer B is a polyhydroxyalkanoate polymer.

5. 4. The molded article of the resin composition according to claim 3, wherein the aliphatic polyester polymer B is a poly(3-hydroxyalkanoate) polymer B.

6. The resin composition molded article according to claim 3, wherein the content of the olefin polymer A is 51 to 99.9 parts by mass and the content of the aliphatic polyester polymer B is 0.1 to 49 parts by mass, relative to a total of 100 parts by mass of the olefin polymer A and the aliphatic polyester polymer B.

7. The resin composition molded article according to claim 3, wherein the content of the olefin polymer A is 60.1 to 99.9 parts by mass and the content of the aliphatic polyester polymer B is 0.1 to 39.9 parts by mass, relative to a total of 100 parts by mass of the olefin polymer A and the aliphatic polyester polymer B.

8. The molded article of the resin composition according to claim 1 or 2, wherein the olefin polymer A is a propylene polymer.

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