JP6630998B2 - Resin composition and resin molding - Google Patents

Description

  The present invention relates to a resin composition and a resin molded product.

  Conventionally, various resin compositions containing a cellulose ester resin have been provided and used for producing various resin molded articles. For example, Patent Document 1 proposes a thermoplastic resin composition containing a cyclic phosphorus compound and a cellulosic resin.

JP 2012-52006 A

  An object of the present invention is to provide a resin composition capable of obtaining a resin molded article having excellent surface gloss as compared with a case where a polyether ester compound is solely compounded as a plasticizer with a cellulose ester resin.

  The above problem is solved by the following means.

The invention according to < 1 > ,
A resin composition comprising a cellulose ester resin, a polyetherester compound, and a polyhydroxyalkanoate resin.

The invention according to < 2 > ,
The resin composition according to < 1 > , wherein the cellulose ester resin is a cellulose ester resin represented by the following general formula (1).

(In the general formula (1), R ¹ , R ² , and R ³ each independently represent a hydrogen atom or an acyl group having 1 to 3 carbon atoms. N represents an integer of 1 or more.)

The invention according to < 3 > ,
The cellulose ester resin represented by the general formula (1) has an acetyl group as an acyl group represented by each of R ¹ , R ² , and R ³ independently, and has a degree of substitution of 2.1 or more. The resin composition according to < 2 > , which is 6 or less.

The invention according to < 4 > ,
The resin composition according to any one of < 1 > to < 3 > , wherein the polyetherester compound is a polyetherester compound represented by the following general formula (2).

(In the general formula (2), R ⁴ and R ⁵ each independently represent an alkylene group having 2 to 10 carbon atoms. A ¹ and A ² each independently represent an alkylene group having 1 to 6 carbon atoms. Represents an alkyl group, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 10 carbon atoms. M represents an integer of 1 or more.)

The invention according to < 5 > ,
The polyether ester compound represented by the general formula (2) is a resin composition according to a compound that represents a n- butylene group as the R ⁵ <4>.

The invention according to < 6 > ,
Polyether ester compound represented by the general formula (2) comprises a compound representing at least one aryl group or an aralkyl group of A ¹ and the A ² <4> or resin composition according to <5> .

The invention according to < 7 > ,
The resin composition according to any one of < 1 > to < 6 > , wherein the polyetherester compound has a weight average molecular weight (Mw) of 450 or more and 650 or less.

The invention according to < 8 > ,
The resin composition according to any one of < 1 > to < 7 > , wherein the viscosity at 25 ° C of the polyetherester compound is 35 mPa · s or more and 50 mPa · s or less.

The invention according to < 9 > ,
The resin composition according to any one of < 1 > to < 8 > , wherein a solubility parameter (SP value) of the polyetherester compound is 9.5 or more and 9.9 or less.

The invention according to < 10 > ,
The resin composition according to any one of < 1 > to < 9 > , wherein the polyhydroxyalkanoate resin is a polyhydroxyalkanoate resin represented by the following general formula (3).

(In the general formula (3), R ⁶ represents an alkylene group having 1 to 10 carbon atoms. P represents an integer of 1 or more.)

The invention according to < 11 > ,
The resin composition according to any one of < 1 > to < 9 > , wherein the polyhydroxyalkanoate resin is a copolymer resin of 3-hydroxybutyrate and 3-hydroxyhexanoate.

The invention according to < 12 > ,
The mass ratio of the cellulose ester resin to the polyether ester compound (cellulose ester resin / polyether ester compound) is 100/25 or more and 100/5 or less, any one of < 1 > to < 11 >. Resin composition.

The invention according to < 13 > ,
The mass ratio of the cellulose ester resin to the polyhydroxyalkanoate resin (cellulose ester resin / polyhydroxyalkanoate resin) is 100/8 or more and 100/2 or less, any one of < 1 > to < 12 >. 3. The resin composition according to item 1.

The invention according to < 14 > ,
A resin molded article containing the resin composition according to any one of < 1 > to < 13 > .

According to the invention according to < 1 >, there is provided a resin composition capable of obtaining a resin molded article having excellent surface gloss as compared with a case where a polyetherester compound is solely compounded as a plasticizer with a cellulose ester resin. .

According to the invention according to < 2 > , the cellulose ester resin contains a cellulose ester resin represented by the general formula (1) as a cellulose ester resin as compared with a case where a polyether ester compound is independently blended as a plasticizer, A resin composition from which a resin molded article having excellent surface gloss is obtained is provided.
According to the invention according to < 3 > , compared with the case where the degree of substitution of the cellulose ester resin represented by the general formula (1) and having an acetyl group as an acyl group is less than 2.1 or more than 2.6, the surface glossiness is higher. The present invention provides a resin composition capable of obtaining a resin molded product excellent in stiffness.

According to the invention according to < 4 > , a polyether ester compound represented by the general formula (2) is used as the polyether ester compound as compared with a case where the polyether ester compound is solely compounded as a plasticizer with the cellulose ester resin. The present invention provides a resin composition which contains a resin molded article having excellent surface gloss.
According to the invention of <5>, polyether ester compound represented by the general formula (2) is, as ^{R 5} n- ethylene group (- _{(CH 2) 2} -) or n- decylene (- (CH ₂ ) There is provided a resin composition capable of obtaining a resin molded article having excellent surface gloss as compared with the case of a compound representing _10- ).
According to the invention according to < 6 > , compared with the case where the polyetherester compound represented by the general formula (2) is a compound representing a t-butyl group as A ¹ and A ² , a resin excellent in surface glossiness. A resin composition from which a molded article is obtained is provided.

According to the invention according to < 7 >, there is provided a resin composition from which a resin molded article having excellent surface gloss can be obtained as compared with the case where the weight average molecular weight (Mw) of the polyetherester compound is less than 450 or more than 650. You.
According to the invention according to < 8 > , a resin composition from which a resin molded article having excellent surface gloss can be obtained as compared with a case where the viscosity at 25 ° C. of the polyetherester compound is less than 35 Pa · s or more than 50 mPa · s. Provided.
According to the invention according to < 9 > , as compared with the case where the solubility parameter (SP value) of the polyetherester compound is less than 9.5 or more than 9.9, a resin composition capable of obtaining a resin molded article having excellent surface glossiness is obtained. Things are provided.

According to the invention according to < 10 > , a polyhydroxyalkanoate represented by the general formula (3) is used as a polyhydroxyalkanoate resin as compared with a case where a polyetherester compound is solely compounded as a plasticizer with a cellulose ester resin. There is provided a resin composition containing a resin, from which a resin molded article having excellent surface gloss can be obtained.
According to the invention according to < 11 >, there is provided a resin composition capable of obtaining a resin molded article having excellent surface gloss as compared with a case where the polyhydroxyalkanoate resin is polylactic acid.

According to the invention according to < 12 > , the surface glossiness is lower than when the mass ratio of the cellulose ester resin to the polyether ester compound (cellulose ester resin / polyether ester compound) is less than 100/25 or more than 100/5. The present invention provides a resin composition capable of obtaining a resin molded product excellent in stiffness.
According to the invention according to < 13 > , the mass ratio of the cellulose ester resin represented by the general formula (1) to the polyhydroxyalkanoate resin (cellulose ester resin / polyhydroxyalkanoate resin) is less than 100/8 or There is provided a resin composition which can provide a resin molded article having excellent surface glossiness as compared with the case where it exceeds 100/2.

According to the invention according to < 14 > , compared to a case where the cellulose ester resin contains a resin composition in which a polyether ester compound is solely compounded as a plasticizer, a resin molded article excellent in surface gloss is provided. .

  Hereinafter, an embodiment which is an example of the present invention will be described. These descriptions and examples illustrate the present invention and do not limit the scope of the present invention.

  In the present specification, when referring to the amount of each component in the composition, when there are a plurality of substances corresponding to each component in the composition, unless otherwise specified, the plurality of substances present in the composition Means the total amount of

<Resin composition>
The resin composition according to the present embodiment includes a cellulose ester resin, a polyetherester compound, and a polyhydroxyalkanoate resin.
The resin composition according to the present embodiment contains a cellulose ester resin as a main component. The main component is a component having the largest content ratio (by mass) among the components contained in the resin composition.

  The resin composition according to the present embodiment is a resin composition in which a resin molded article having excellent surface gloss is obtained by blending a polyetherester compound and a polyhydroxyalkanoate resin with a cellulose ester resin. The reason for this is not clear, but is considered as follows.

First, when a polyether ester compound is mixed with a cellulose ester resin, the intermolecular force of the cellulose ester resin is appropriately weakened due to the high affinity between the two and the molecular structure of the polyether ester compound. When the intermolecular force is weakened, the cellulose ester resin changes from an anisotropic dispersion state to a highly isotropic dispersion state. Thereby, the transparency of the resin composition containing the cellulose ester resin is enhanced.
Furthermore, when a polyhydroxyalkanoate resin is added to the resin composition system, the polyhydroxyalkanoate resin receives a repulsive force from the cellulose ester resin and forms a fine spherical structure. Then, the polyhydroxyalkanoate resin having a spherical structure is dispersed in a nearly uniform state, thereby exhibiting glossiness.

From the above, the resin composition according to the present embodiment can provide a resin molded article having excellent surface glossiness by the above configuration.
Further, the resin composition according to the present embodiment has thermoplasticity (fluidity) and high moldability. This is because the affinity between the cellulose ester resin and the polyetherester compound is high, the dispersion state of both is close to uniform, and high isotropy is considered to be created.

  Hereinafter, the components of the resin composition according to the present embodiment will be described in detail.

[Cellulose ester resin]
The resin composition according to the present embodiment contains a cellulose ester resin. Specific examples of the cellulose ester resin include a cellulose ester resin represented by the general formula (1).

In the general formula (1), R ¹ , R ² , and R ³ each independently represent a hydrogen atom or an acyl group having 1 to 3 carbon atoms. n represents an integer of 1 or more.

In the general formula (1), examples of the acyl group represented by R ¹ , R ² , and R ³ include an acetyl group, a propionyl group, and a butyryl group. As the acyl group, an acetyl group is desirable from the viewpoint of improving the surface gloss of the resin molded product. Further, from the viewpoint of improving the moldability of the resin composition, the acyl group is preferably an acetyl group.

In the general formula (1), the range of n is not particularly limited, but is preferably 250 or more and 750 or less, more preferably 350 or more and 600 or less.
When n is 250 or more, the strength of the resin molded body tends to increase. When n is 750 or less, a decrease in flexibility of the resin molded body is easily suppressed.

Here, in the general formula (1), R ¹ , R ² and R ³ each independently represent an acyl group means that at least a part of the hydroxyl group of the cellulose ester resin represented by the general formula (1) is an acyl group. It has been shown that
That, R ¹ and n times in the cellulose ester resin molecule may be different from each other in the same part in all the same. Similarly, n R ² and n A ³ may be all the same, partially the same, or different from each other.

The substitution degree of the cellulose ester resin is preferably 2.1 or more and 2.6 or less, more preferably 2.2 or more and 2.5 or less.
When the degree of substitution is 2.1 or more, the affinity with the polyetherester compound tends to increase. When the substitution degree is set to 2.6 or less, crystallization of the cellulose ester resin is suppressed, and the thermoplasticity is easily developed. For this reason, when the substitution degree is in the above range, the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.
The degree of substitution is an index indicating the degree of acylation of the cellulose ester resin. Specifically, the degree of substitution means the intramolecular average of the number of substitutions obtained by substituting three hydroxyl groups in the D-glucopyranose unit of the cellulose ester resin with an acyl group.

Here, from the viewpoint of improving the surface glossiness of the resin molded product, in particular, the cellulose ester resin has an acetyl group as an acyl group represented by R ¹ , R ² , and R ³ independently, and has a degree of substitution. Is desirably a resin of not less than 2.1 and not more than 2.6.

  The weight average molecular weight (Mw) of the cellulose ester resin is preferably from 100,000 to 300,000, more preferably from 150,000 to 200,000 from the viewpoint of improving the mechanical strength of the resin molded product. The weight average molecular weight is a value measured by the same method as the method for measuring the weight average molecular weight of the polyetherester compound.

  Hereinafter, specific examples of the cellulose ester resin will be described, but the present invention is not limited thereto.

[Polyetherester compound]
The resin composition according to the present embodiment contains a polyetherester compound. Specific examples of the polyetherester compound include a polyetherester compound represented by the general formula (2).

In the general formula (2), R ⁴ and R ⁵ each independently represent an alkylene group having 2 to 10 carbon atoms. A ¹ and A ² each independently represent an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 10 carbon atoms. m represents an integer of 1 or more.

In Formula (2), the alkylene group represented by R ⁴ is preferably an alkylene group having 3 to 10 carbon atoms, and more preferably an alkylene group having 3 to 6 carbon atoms. The alkylene group represented by R ⁴ may be linear, branched or cyclic, but is preferably linear.
When the number of carbon atoms of the alkylene group represented by R ⁴ is 3 or more, a decrease in fluidity of the resin composition is suppressed, and thermoplasticity is easily developed. When the number of carbon atoms of the alkylene group represented by R ⁴ is 10 or less, or when the alkylene group represented by R ⁴ is linear, affinity with the cellulose ester resin is easily increased. Therefore, when the alkylene group represented by R ⁴ is linear and the number of carbon atoms is in the above range, the degree of substitution is in the above range, whereby the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.
From these viewpoints, the alkylene group represented by R ⁴ is particularly preferably an n-hexylene group (— (CH ₂ ) ₆ —). That is, the polyetherester compound is desirably a compound that represents an n-hexylene group (— (CH ₂ ) ₆ —) as R ⁴ .

In Formula (2), the alkylene group represented by R ⁵ is preferably an alkylene group having 3 to 10 carbon atoms, and more preferably an alkylene group having 3 to 6 carbon atoms. The alkylene group represented by R ⁵ may be linear, branched or cyclic, but is preferably linear.
When the number of carbon atoms of the alkylene group represented by R ⁵ is 3 or more, a decrease in the fluidity of the resin composition is suppressed, and thermoplasticity is easily developed. When the number of carbon atoms of the alkylene group represented by R ⁵ is 10 or less, or when the alkylene group represented by R ⁵ is linear, affinity with the cellulose ester resin is easily increased. Therefore, when the alkylene group represented by R ⁵ is linear and the number of carbon atoms is in the above range, the degree of substitution is in the above range, whereby the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.
From these viewpoints, the alkylene group represented by R ⁵ is particularly preferably an n-butylene group (— (CH ₂ ) ₄ —). That is, the polyetherester compound is desirably a compound that represents an n-butylene group (— (CH ₂ ) ₄ —) as R ⁵ .

In formula (2), the alkyl group represented by A ¹ and A ² is preferably an alkyl group having 1 to 10 carbon atoms, and more preferably an alkyl group having 1 to 6 carbon atoms. The alkyl group represented by A ¹ and A ² may be linear, branched, or cyclic, but is preferably branched.
Examples of the aryl group represented by A ¹ and A ² include an unsubstituted aryl group such as a phenyl group and a naphthyl group; and a substituted phenyl group such as a methylphenyl group and a t-butylphenyl group.
A ^1, and the aralkyl ^{group A 2} represents ^a group represented by -R A -Ph. ^RA represents a linear or branched alkylene group having 1 to 6 carbon atoms (preferably 1 to 6 carbon atoms). Ph represents an unsubstituted phenyl group: a linear or branched substituted phenyl group substituted with an alkyl group having 1 to 6 carbon atoms (preferably 2 to 4 carbon atoms). Specific examples of the aralkyl group include, for example, unsubstituted aralkyl groups such as benzyl group, phenylmethyl group (phenethyl group), phenylpropyl group and phenylbutyl group; and substituted aralkyl groups such as methylbenzyl group, dimethylbenzyl group and methylphenethyl group. Groups.

At least one of A ¹ and A ² preferably represents an aryl group or an aralkyl group. In other words, a polyether ester compound, A ^1, and it is desirable for (preferably phenyl group) an aryl group as at least one A ² is a compound representing or aralkyl group, an aryl group both as A ^1, and A ² ( Desirably, the compound represents a phenyl group) or an aralkyl group [particularly, an aryl group (preferably, a phenyl group)]. A polyetherester compound which represents an aryl group (preferably a phenyl group) or an aralkyl group as at least one of A ¹ and A ² easily forms an appropriate space between the molecules of the cellulose ester resin, and further promotes the crystallization of cellulose. Suppress. For this reason, the surface glossiness of the resin molded body is further improved. Further, the moldability of the resin composition is further improved.

In the general formula (2), the range of m is not particularly limited, but is preferably 1 or more and 5 or less, for example, 1 or more and 3 or less.
When m is 1 or more, bleeding (precipitation) of the polyetherester compound becomes difficult. When m is 5 or less, the affinity with the cellulose ester resin tends to increase. Therefore, when m is in the above range, the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.

  Next, the characteristics of the polyetherester compound will be described.

The weight average molecular weight (Mw) of the polyetherester compound is preferably from 450 to 650, more preferably from 500 to 600,
When the weight average molecular weight (Mw) is 450 or more, bleeding (precipitation phenomenon) becomes difficult. When the weight average molecular weight (Mw) is 650 or less, the affinity with the cellulose ester resin tends to increase. Therefore, when the weight average molecular weight (Mw) is in the above range, the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.
The weight average molecular weight (Mw) is a value measured by gel permeation chromatography (GPC). Specifically, the molecular weight measurement by GPC is carried out using a Tosoh column, TSKgel GMHHR-M + TSKgel GMHHR-M (7.8 mm ID.30 cm) with a chloroform solvent, using Tosoh HPLC1100 as a measuring device. . The weight average molecular weight is calculated from the measurement result using a molecular weight calibration curve prepared from a monodisperse polystyrene standard sample.

The viscosity at 25 ° C. of the polyetherester compound is preferably from 35 mPa · s to 50 mPa · s, and more preferably from 40 mPa · s to 45 mPa · s.
When the viscosity is 35 mPa · s or more, the dispersibility in the cellulose ester resin is easily improved. When the viscosity is 50 mPa · s or less, the anisotropy of dispersion of the polyetherester compound hardly appears. Therefore, when the viscosity is in the above range, the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.
The viscosity is a value measured by an E-type viscometer.

The solubility parameter (SP value) of the polyetherester compound is preferably from 9.5 to 9.9, more preferably from 9.6 to 9.8.
When the solubility parameter (SP value) is 9.5 or more and 9.9 or less, the dispersibility in the cellulose ester resin is easily improved. Therefore, when the solubility parameter (SP value) is in the above range, the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.
The solubility parameter (SP value) is a value calculated by the method of Fedor. Specifically, the solubility parameter (SP value) is, for example, the value of Polym. Eng. Sci. , Vol. 14, p. 147 (1974), the SP value is calculated by the following equation.
Formula: SP value = √ (Ev / v) = √ (ΣΔei / ΣΔvi)
(Where, Ev: evaporation energy (cal / mol), v: molar volume (cm ³ / mol), Δei: evaporation energy of each atom or atomic group, Δvi: molar volume of each atom or atomic group)
The solubility parameter (SP value) employs (cal / cm ³ ) ^1/2 as a unit, but the unit is omitted according to custom and is expressed in a dimensionless manner.

Here, in particular, from the viewpoint of improving the surface glossiness of the resin molded product, the polyetherester compound represents an n-butylene group as R ⁵ , and an aryl group or an aralkyl group as at least one of A ¹ and A ^2. A compound having a weight average molecular weight (Mw) of 450 or more and 650 or less is desirable.
From the same viewpoint, the polyetherester compound is preferably a compound having a viscosity at 25 ° C of 35 mPa · s to 50 mPa · s and a solubility parameter (SP value) of 9.5 to 9.9.

  Hereinafter, specific examples of the polyetherester compound will be described, but the present invention is not limited thereto.

[Polyhydroxyalkanoate resin]
The resin composition according to the present embodiment contains a polyhydroxyalkanoate resin. Specific examples of the polyhydroxyalkanoate resin include a polyhydroxyalkanoate resin represented by the general formula (3).

(In the general formula (3), R ⁶ represents an alkylene group having 1 to 10 carbon atoms. P represents an integer of 1 or more.)

In Formula (3), the alkylene group represented by R ⁶ is preferably an alkylene group having 3 to 6 carbon atoms. The alkylene group represented by R ⁶ may be linear or branched, but is preferably branched from the viewpoint of improving the surface gloss of the resin molded product. Also, from the viewpoint of improving the moldability of the resin composition, the alkylene group represented by R ⁶ is preferably branched.

In the general formula (3), the range of p is not particularly limited, but is preferably 10 or more and 2000 or less, and more preferably 50 or more and 1000 or less.
When p is 10 or more and 2000 or less, the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.

Here, in the general formula (3), R ⁶ represents an alkylene group, 1) that R ⁶ has an [OR ⁶ -C (＝ O)-] structure representing the same alkylene group, 2) has been shown to have the structure - alkylene group R ⁶ is different ^{[O-R 6 -C (=} O)] representing the ^{(R 6} is an alkylene group having different carbon numbers or branched).
That is, the polyhydroxyalkanoate resin may be a homopolymer of one kind of hydroxyalkanoate (hydroxyalkanoic acid) or a copolymer of two or more kinds of hydroxyalkanoate (hydroxyalkanoic acid). Is also good.

  Examples of the hydroxyalkanoic acid forming the polyhydroxyalkanoate resin include lactic acid, 2-hydroxybutyric acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 2-hydroxy-3-methylbutyric acid, 2-hydroxy-3,3-dimethylbutyric acid 3-hydroxyvaleric acid, 4-hydroxyvaleric acid, 5-hydroxyvaleric acid, 3-hydroxyhexanoic acid, 2-hydroxycaproic acid, 2-hydroxyisocaproic acid, 6-hydroxycaproic acid, 3-hydroxypropionic acid, 3-hydroxy-2,2-dimethylpropionic acid, 3-hydroxyhexanoic acid, 2-hydroxy-n-octanoic acid and the like.

  Among these, the polyhydroxyalkanoate resin is a copolymer resin of a branched hydroxyalkanoic acid having 2 to 4 carbon atoms and a branched hydroxyalkanoic acid having 5 to 7 carbon atoms (provided that the number of carbon atoms is And a copolymer resin of 3-hydroxybutyric acid and 3-hydroxycaproic acid (a copolymer resin of 3-hydroxybutyrate and 3-hydroxyhexanoate). Is more desirable. When this copolymer resin is used, the polyhydroxyalkanoate resin easily forms a fine spherical structure, and the surface gloss of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.

The weight average molecular weight (Mw) of the polyhydroxyalkanoate resin is preferably from 10,000 to 500,000, more preferably from 30,000 to 200,000.
When the weight average molecular weight (Mw) is 10,000 or more and 500,000 or less, the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved. The weight average molecular weight (Mw) is a value measured by the same method as the method for measuring the weight average molecular weight of the polyetherester compound.

  Hereinafter, specific examples of the polyhydroxyalkanoate resin will be described, but the present invention is not limited thereto.

[Contents of Cellulose Ester Resin, Polyether Ester Compound, and Polyhydroxyalkanoate Resin]
The mass ratio of the cellulose ester resin to the polyether ester compound (cellulose ester resin / polyether ester compound) is preferably from 100/25 to 100/5, more preferably from 100/20 to 100/9.
When the mass ratio is 100/25 or more, the polyether ester compound does not easily bleed (precipitate). When the mass ratio is 100/5 or less, the anisotropy of the dispersed state of the cellulose ester resin is eliminated, the isotropy is increased, and the intermolecular force between the cellulose ester resins is reduced. Further, a decrease in the fluidity of the resin composition is suppressed, and the thermoplasticity is easily developed. For this reason, when the mass ratio is in the above range, the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.

The mass ratio of cellulose ester resin to polyhydroxyalkanoate resin (cellulose ester resin / polyhydroxyalkanoate resin) is preferably from 100/8 to 100/2, more preferably from 100/5 to 100/2.
When the mass ratio is 100/8 or more and 100/2 or less, the surface glossiness of the resin molded product is further improved. Further, the moldability of the resin composition is further improved.

  In addition, the mass ratio of the cellulose ester resin to the entire resin composition is preferably from 50% by mass to 95% by mass, and more preferably from 60% by mass to 90% by mass.

[Other ingredients]
The resin composition according to the present embodiment may further include other components other than those described above as necessary. Other components include, for example, a flame retardant, a compatibilizer, a plasticizer, an antioxidant, a release agent, a light-proofing agent, a weathering agent, a coloring agent, a pigment, a modifying agent, an anti-drip agent, an antistatic agent, and an antistatic agent. Hydrolytic inhibitors, fillers, reinforcing agents (glass fiber, carbon fiber, talc, clay, mica, glass flake, milled glass, glass beads, crystalline silica, alumina, silicon nitride, alumina nitride, boron nitride, etc.) Is mentioned. The content of each of these components is desirably 0% by mass or more and 5% by mass or less based on the entire resin composition. Here, “0% by mass” means that other components are not contained.

The resin composition according to the present embodiment may contain a resin other than the above resin. However, it is preferable that the other resin accounts for 5% by mass or less of the total resin in terms of mass ratio.
Other resins include, for example, conventionally known thermoplastic resins. Specific examples include a polycarbonate resin; a polypropylene resin; a polyester resin; a polyolefin resin; a polyester carbonate resin; a polyphenylene ether resin; a polyphenylene sulfide resin; Polyether sulfone resin; polyarylene resin; polyetherimide resin; polyacetal resin; polyvinyl acetal resin; polyketone resin; polyetherketone resin; polyetheretherketone resin; polyarylketone resin; polyethernitrile resin; Benzimidazole resin; polyparabanic acid resin; selected from the group consisting of aromatic alkenyl compounds, methacrylates, acrylates, and vinyl cyanide compounds Vinyl polymer or copolymer resin obtained by polymerizing or copolymerizing at least one vinyl monomer; diene-aromatic alkenyl compound copolymer resin; vinyl cyanide-diene-aromatic alkenyl compound Copolymer resin; aromatic alkenyl compound-diene-vinyl cyanide-N-phenylmaleimide copolymer resin; vinyl cyanide- (ethylene-diene-propylene (EPDM))-aromatic alkenyl compound copolymer resin; polyolefin Vinyl chloride resin; chlorinated vinyl chloride resin; These resins may be used alone or in combination of two or more.

[Method for producing resin composition]
The resin composition according to the present embodiment is produced, for example, by melt-kneading a mixture of the above components. In addition, the resin composition according to the present embodiment is produced, for example, by dissolving the above components in a solvent. Known means can be used as the means for melt-kneading, and specific examples include a twin-screw extruder, a Henschel mixer, a Banbury mixer, a single-screw extruder, a multi-screw extruder, and a kneader.

<Resin molded body>
The resin molded body according to the present embodiment includes the resin composition according to the present embodiment. That is, the resin molded product according to the present embodiment has the same composition as the resin composition according to the present embodiment.
Specifically, the resin molded body according to the present embodiment is obtained by molding the resin composition according to the present embodiment. As a molding method, for example, injection molding, extrusion molding, blow molding, hot press molding, calendar molding, coating molding, cast molding, dipping molding, vacuum molding, transfer molding and the like may be applied.

  In the method of molding a resin molded body according to the present embodiment, injection molding is desirable in that the degree of freedom in shape is high. In particular, it is preferable to apply injection molding from the viewpoint of utilizing the moldability (thermoplasticity and fluidity) of the resin composition according to the present embodiment to obtain a resin molded body having excellent surface gloss. The cylinder temperature of the injection molding is, for example, 200 ° C. or more and 250 ° C. or less, and preferably 210 ° C. or more and 230 ° C. or less. The mold temperature for injection molding is, for example, 40 ° C. or more and 60 ° C. or less, and more preferably 45 ° C. or more and 55 ° C. or less. Injection molding may be performed using a commercially available device such as NEX150 manufactured by Nissei Plastic Industries, NEX70000 manufactured by Nissei Plastics Industries, or SE50D manufactured by Toshiba Machine Co., Ltd.

  The resin molded article according to the present embodiment is suitably used for applications such as electronic / electric equipment, office equipment, home electric appliances, automobile interior materials, and containers. More specifically, housings of electronic / electric devices and home electric appliances; various parts of electronic / electric devices and home electric appliances; interior parts of automobiles; storage cases such as CD-ROM and DVD; tableware; beverage bottles; Wrapping material; film; sheet;

  Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

<Examples 1 to 34, Comparative Examples 1 to 10>
[Kneading]
The materials having the compositions shown in Tables 1 and 2 are charged into a twin-screw kneading apparatus (TEX41SS manufactured by Toshiba Machine Co., Ltd.), kneaded at a cylinder temperature of 220 ° C. or more and 250 ° C. or less, and pellets of the resin composition (hereinafter referred to as “resin pellets”). "). In Tables 1 and 2, “parts” means “parts by mass”.

[injection molding]
The obtained pellets are put into an injection molding machine (Nissei Plastic Industries, PNX40), and injection molding is performed at a cylinder temperature of 220 ° C or more and 250 ° C or less and a mold temperature of 40 ° C or more and 60 ° C or less. A D2 compact (length 60 mm, width 60 mm, thickness 2 mm) was obtained.

[Evaluation]
The following evaluation was performed on the obtained D2 test piece or resin pellet. The results are shown in Tables 1 and 2.

−Moldability−
Using a melt indexer (G-01 manufactured by Toyo Seiki Co., Ltd.), the melt flow rate (MFR: g / 10 min) of the resin pellets was measured under the conditions of 220 ° C./21.2 N, and the moldability was evaluated.

−Surface gloss−
Further, the glossiness of the surface of the D2 test piece was measured with a gloss checker (IG410 manufactured by Horiba, Ltd.) to evaluate the surface glossiness.

  From the above results, it can be seen that in the present example, the evaluation results of the surface gloss and the moldability were both better than in the comparative example.

The material types in Tables 1 and 2 are as follows.
-Compounds 1 to 8: Refer to the specific examples of the cellulose ester resin described above.-Compounds 8 to 23: Refer to the specific examples of the polyether ester compounds described above.-Compounds 24 to 26: Specific examples of the polyhydroxyalkanoate resin described above. Reference compound 27: compound represented by the following structural formula (C1) compound 28: compound represented by the following structural formula (C2) compound 29: triphenyl phosphate (TPP, manufactured by Daihachi Chemical Industry Co., Ltd.)

Claims (12)

  A resin composition comprising a cellulose ester resin, a polyetherester compound, and a polyhydroxyalkanoate resin which is a copolymer resin of only 3-hydroxybutyrate and 3-hydroxyhexanoate. The resin composition according to claim 1, wherein the cellulose ester resin is a cellulose ester resin represented by the following general formula (1).


(In the general formula (1), R ¹ , R ² , and R ³ each independently represent a hydrogen atom or an acyl group having 1 to 3 carbon atoms. N represents an integer of 1 or more.) The cellulose ester resin represented by the general formula (1) has an acetyl group as an acyl group represented by each of R ¹ , R ² , and R ³ independently, and has a degree of substitution of 2.1 or more. The resin composition according to claim 2, wherein the resin composition is 6 or less. The resin composition according to any one of claims 1 to 3, wherein the polyether ester compound is a polyether ester compound represented by the following general formula (2).


(In the general formula (2), R ⁴ and R ⁵ each independently represent an alkylene group having 2 to 10 carbon atoms. A ¹ and A ² each independently represent an alkylene group having 1 to 6 carbon atoms. Represents an alkyl group, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 10 carbon atoms. M represents an integer of 1 or more.) The polyether ester compound represented by the general formula (2) is a resin composition according to claim 4 which is a compound representing an n- butylene group as the R ^5. Polyether ester compound represented by the general formula (2) is a resin composition according to claim 4 or claim 5 wherein a compound represents at least one aryl group or an aralkyl group of A ¹ and the A ² .   The resin composition according to any one of claims 1 to 6, wherein the polyetherester compound has a weight average molecular weight (Mw) of 450 or more and 650 or less.   The resin composition according to any one of claims 1 to 7, wherein the viscosity at 25 ° C of the polyetherester compound is 35 mPa · s or more and 50 mPa · s or less.   The resin composition according to any one of claims 1 to 8, wherein a solubility parameter (SP value) of the polyetherester compound is 9.5 or more and 9.9 or less. The mass ratio of the cellulose ester resin to the polyetherester compound (cellulose ester resin / polyetherester compound) is 100/25 or more and 100/5 or less, according to any one of claims 1 to 9. Resin composition. Mass ratio of said cellulose ester resin wherein the polyhydroxyalkanoate resin (cellulose ester resin / polyhydroxyalkanoate resin), any one of claims 1 to 10 is 100/8 or 100/2 or less 3. The resin composition according to item 1. Resin molding comprising the resin composition according to any one of claims 1 to 11.