JP6524630B2 - Resin composition and resin molded body - Google Patents

Description

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

  Conventionally, various resin compositions containing a cellulose ester resin are provided and used in the manufacture of various resin moldings. For example, Patent Document 1 proposes a thermoplastic resin composition containing a cyclic phosphorus compound and a cellulose-based resin.

JP, 2012-52006, A

  The object of the present invention is to obtain a resin molded article excellent in steel ball drop strength as compared with the case where a polyether ester compound is compounded alone as a plasticizer to a cellulose ester resin, and is generated from a screw of a molding machine at the time of molding. It is providing the resin composition which suppresses a noise.

  The above-mentioned subject is solved by the following means.

The invention pertaining to < 1 > is
A resin composition comprising a cellulose ester resin, a polyether ester compound, and a polyolefin resin.

The invention pertaining to < 2 > is
The resin composition as described in < 1 > whose said cellulose ester resin is a cellulose ester resin represented by following General formula (1).

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

The invention pertaining to < 4 > is
The resin composition of any one of < 1 > - < 3 > whose said polyetherester compound is a polyetherester compound represented by following General formula (2).

(In 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 have 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 18 carbon atoms, m represents an integer of 1 or more)

The invention pertaining to < 5 > is
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 pertaining to < 6 > is
The resin composition according to < 4 > or < 5 > , wherein the polyether ester compound represented by the general formula (2) is a compound that represents an aryl group or an aralkyl group as at least one of the A ¹ and the A ² .

The invention concerning < 7 > is
The resin composition of any one of < 1 > - < 6 > whose weight average molecular weight (Mw) of the said polyetherester compound is 450-650.

The invention pertaining to < 8 > is
The resin composition of any one of < 1 > - < 7 > whose viscosity at 25 degrees C of the said polyether ester compound is 35 mPa * s or more and 50 mPa * s or less.

The invention according to < 9 > is
The resin composition of any one of < 1 > - < 8 > whose solubility parameter (SP value) of the said polyether ester compound is 9.5-9.9.

The invention relating to < 10 > is
The resin composition of any one of < 1 > - < 9 > whose weight average molecular weight of the said polyolefin resin is 20000 or more and less than 50000.

The invention pertaining to < 11 > is
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 according to any one of < 1 > to < 10 >. Resin composition.

The invention pertaining to < 12 > is
The resin composition according to any one of < 1 > to < 11 > , wherein the mass ratio of the cellulose ester resin to the polyolefin resin (cellulose ester resin / polyolefin resin) is 100/8 or more and 100/2 or less. .

The invention relating to < 13 > is
The resin molding containing the resin composition of any one of < 1 > - < 12 > .

According to the invention which concerns on < 1 > , compared with the case where a polyetherester compound is separately mix | blended with a cellulose ester resin as a plasticizer, the resin molded object excellent in steel ball fall strength is obtained, and at the time of shaping | molding A resin composition is provided which suppresses noise generated from a screw.

According to the invention which concerns on < 2 > , compared with the case where a polyetherester compound is separately mix | blended with cellulose ester resin as a plasticizer, the cellulose ester resin represented by General formula (1) as a cellulose ester resin is included, and steel There is provided a resin composition excellent in ball drop strength, and a resin composition capable of suppressing squeaking generated from a screw of a molding machine at the time of molding.
According to the invention which concerns on < 3 > , compared with the case where substitution degree of cellulose-ester resin which is represented by General formula (1) and has an acetyl group as an acyl group is less than 2.1 or more than 2.6, steel ball fall A resin composition excellent in strength is obtained, and a resin composition capable of suppressing squeaking generated from a screw of a molding machine at the time of molding is provided.

According to the invention which concerns on < 4 > , compared with the case where a polyetherester compound is separately mix | blended with cellulose ester resin as a plasticizer, the polyetherester compound represented by General formula (2) as a polyetherester compound is included. Thus, a resin molded product excellent in steel ball drop strength is obtained, and a resin composition is provided which suppresses the noise generated from the screw of the molding machine at the time of molding.
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 ) A resin composition excellent in steel ball drop strength is obtained as compared with the compound representing _10- ), and a resin composition is provided which suppresses the squeal generated from the screw of the molding machine at the time of molding.
According to the invention of <6>, polyether ester compound represented by the general formula (2) is compared with the case where the compound represents a t- butyl group as A ¹ and A ^2, excellent steel ball drop strength A resin molded product is obtained, and a resin composition is provided which suppresses noise generated from the screw of a molding machine at the time of molding.

According to the invention which concerns on < 7 > , compared with the case where the weight average molecular weight (Mw) of a polyetherester compound is less than 450 or more than 650, the resin molded object excellent in steel ball fall strength is obtained, and it shape | molds at the time of shaping | molding. A resin composition is provided that suppresses noise generated from the screw of the machine.
According to the invention which concerns on < 8 > , compared with the case where the viscosity in 25 degreeC of a polyetherester compound is less than 35 Pa.s or 50 mPa * s, the resin molded object excellent in steel ball falling strength is obtained, and it shape | molds SUMMARY OF THE INVENTION A resin composition is provided which suppresses the noise generated from the screw of a molding machine.
According to the invention which concerns on < 9 > , compared with the case where the solubility parameter (SP value) of a polyether ester compound is less than 9.5 or 9.9, the resin molding excellent in steel ball falling strength is obtained, And, a resin composition is provided which suppresses the noise generated from the screw of the molding machine at the time of molding.

According to the invention concerning < 10 > , compared with the case where the weight average molecular weight of polyolefin resin is less than 20,000 or 50,000, the resin molded object excellent in steel ball falling strength is obtained, and it generates from the screw of a molding machine at the time of molding. There is provided a resin composition that suppresses noise.

According to the invention which concerns on < 11 > , compared with the case where mass ratio (cellulose ester resin / polyether ester compound) of cellulose ester resin and polyether ester compound is less than 100/25 or more than 100/5, steel ball fall A resin composition excellent in strength is obtained, and a resin composition capable of suppressing squeaking generated from a screw of a molding machine at the time of molding is provided.
According to the invention which concerns on < 12 >, when mass ratio (cellulose-ester resin / polyolefin resin) of cellulose-ester resin and polyolefin resin represented by General formula (1) is less than 100/8 or more than 100/2 Provided is a resin composition excellent in steel ball drop strength as compared with the above, and a resin composition is provided which suppresses noise generated from the screw of the molding machine at the time of molding.

According to the invention which concerns on < 13 > , compared with the case where the resin composition which mix | blended the polyether ester compound independently as a plasticizer with cellulose ester resin is provided, the resin molding excellent in steel ball fall strength 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, the plurality of types present in the composition unless otherwise specified. Mean the total amount of substance.

<Resin composition>
The resin composition according to the present embodiment contains a cellulose ester resin, a polyether ester compound, and a polyolefin resin.
In addition, the resin composition which concerns on this embodiment contains cellulose-ester resin as a main component. The main component means a component having the largest content ratio (mass standard) among the components contained in the resin composition.

Here, in general, the cellulose ester resin is poor in thermoplasticity because the melt viscosity does not decrease even if it is heated. For this reason, the resin composition of cellulose ester resin alone has low flowability and poor moldability.
When a plasticizer having a high affinity and a low melt viscosity is mixed with the cellulose ester resin, thermoplasticity is imparted. In the cellulose ester resin, as the amount of the plasticizer is increased, the melt viscosity is decreased while the thermoplasticity is improved, that is, the flowability is enhanced. However, due to the influence of temperature, humidity and time, a phenomenon (bleed) in which a plasticizer precipitates may occur on the surface of the pellet of the resin composition or the resin molded product. Moreover, the fall of the elasticity modulus of the pellet of a resin composition or a resin molding may arise.
Thus, the content of the plasticizer is currently limited. And, with the content of this limited plasticizer, the thermoplasticity (flowability) of the resin composition containing a cellulose ester resin is not sufficient, and a squeak may occur from the screw of the molding machine at the time of molding. Squeal during molding is a phenomenon that occurs when the rotational torque (plasticizing torque) of the screw of the molding machine increases when the thermoplasticity (flowability) of the resin composition is low, and the screw rubs against the resin composition. .
Furthermore, with the content of this limited plasticizer, the toughness of the resin molded product obtained from the resin composition containing a cellulose ester resin may be insufficient, and the steel ball drop strength may be insufficient.

  On the other hand, when a polyether ester compound and a polyolefin resin are blended in a cellulose ester resin, a resin molded article excellent in steel ball drop strength is obtained, and squeaking generated from a screw of a molding machine at the time of molding is suppressed. It becomes a resin composition. The reason is not clear, but I think as follows.

First, when a polyetherester compound is mixed with a cellulose ester resin, the intermolecular force of the cellulose ester resin is moderately weakened from the height of the affinity of both and the molecular structure of the polyetherester compound, and the intermolecularity of the resin is appropriate. Create a space.
When a polyolefin resin having a low affinity to the cellulose ester resin is blended in a system of a resin composition that produces such a state, it enters the space between the molecules of the cellulose ester resin and causes slip at the interface with the resin. The slippage at this interface contributes to the thermoplasticity (flowability) of the resin composition, so that the plasticizing torque of the screw of the molding machine is reduced.
In addition to this, the polyolefin resin intrudes into the interstices of the molecules of the cellulose ester resin, thereby enhancing the toughness of the resin molded product.

As mentioned above, the resin composition which concerns on this embodiment is a resin molded object excellent in steel ball fall strength by the said structure, and suppresses the noise which generate | occur | produces from the screw of a molding machine at the time of shaping | molding.
Further, the resin composition according to the present embodiment has thermoplasticity (flowability) and also has high moldability. This is because it is considered that the affinity between the cellulose ester resin and the polyether ester compound is high, the dispersed state of both is close to uniform, and high isotropy is 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. Specifically as a cellulose ester resin, the cellulose ester resin represented by General formula (1) is mentioned, for example.

In 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), the acyl group represented by R 1, ^{R 2,} and ^{R 3,} acetyl group, propionyl group, and butyryl groups. As an acyl group, an acetyl group is desirable from the viewpoint of suppression of the squeal at the time of shaping | molding of a resin composition, and the improvement of the steel ball falling strength of a resin molding. Also, from the viewpoint of improving the moldability of the resin composition, an acetyl group is desirable as the acyl group.

The range of n in the general formula (1) is not particularly limited, but is preferably 250 or more and 750 or less, and more preferably 350 or more and 600 or less.
When n is 250 or more, the strength of the resin molded product tends to be increased. When n is equal to or less than 750, the decrease in the flexibility of the resin molded product is easily suppressed.

Here, in the general formula (1), that R ¹ , R ² and R ³ independently represent an acyl group means that at least a part of the hydroxyl groups of the cellulose ester resin represented by the general formula (1) is an acyl It shows that it is
That is, n R ^{1 s} in the cellulose ester resin molecule may be all identical, partially identical or different from each other. Similarly, n pieces of R ² and n pieces of A ³ may be all identical, partially identical or different from each other.

The degree of substitution of the cellulose ester resin is desirably 2.1 or more and 2.6 or less, and more desirably 2.2 or more and 2.5 or less.
When the degree of substitution is 2.1 or more, the affinity to the polyether ester compound is likely to be enhanced. When the degree of substitution is 2.6 or less, crystallization of the cellulose ester resin is suppressed and thermoplasticity is easily developed. For this reason, when the degree of substitution is in the above range, the squeal at the time of molding of the resin composition is further suppressed, and the steel ball drop strength of the resin molded product is further improved. In addition, the moldability of the resin composition is further improved.
The degree of substitution is an index showing the degree of acylation of the cellulose ester resin. Specifically, the degree of substitution means the intramolecular average of the number of substituted groups in which three hydroxyl groups in the D-glucopyranose unit of the cellulose ester resin are substituted with an acyl group.

Here, R ¹ , R ² , and R ³ independently represent, in particular, cellulose ester resin, from the viewpoint of suppression of squeal at the time of molding of the resin composition and improvement of the steel ball falling strength of the resin molded body. It is preferable that the resin has an acetyl group as an acyl group and the degree of substitution is 2.1 or more and 2.6 or less.

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

  Hereinafter, although the specific example of cellulose ester resin is shown, it is not necessarily restricted to this.

[Polyether ester compound]
The resin composition according to the present embodiment contains a polyether ester compound. Specifically as a polyether ester compound, the polyether ester compound represented by General formula (2) is mentioned, for example.

In General Formula (2), R ⁴ and R ⁵ each independently represent an alkylene group having 2 to 10 carbon atoms. Each of A ¹ and A ² independently represents 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 18 carbon atoms. m represents an integer of 1 or more.

In the general 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, and is preferably linear.
When the carbon number of the alkylene group represented by R ⁴ is 3 or more, the decrease in fluidity of the resin composition is suppressed, and thermoplasticity is easily exhibited. When the number of carbon atoms of the alkylene group represented by R ⁴ is 10 or less or the alkylene group represented by R ⁴ is linear, the affinity to the cellulose ester resin is likely to be enhanced. For this reason, when the alkylene group represented by R ⁴ is linear and the carbon number is in the above range, when the substitution degree is in the above range, the squeal at the time of molding of the resin composition is further suppressed, and the steel of the resin molded body The ball drop strength is further improved. In addition, the moldability of the resin composition is further improved.
From these viewpoints, in particular, the alkylene group represented by R ⁴ is preferably n-hexylene group (— (CH ₂ ) ₆ —). That is, it is desirable that the polyether ester compound is a compound that represents n-hexylene group (-(CH ₂ ) _6- ) as R ⁴ .

In the general 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, and is preferably linear.
When the carbon number of the alkylene group represented by R ⁵ is 3 or more, the decrease in fluidity of the resin composition is suppressed, and thermoplasticity is easily exhibited. When the number of carbon atoms of the alkylene group represented by R ⁵ is 10 or less or the alkylene group represented by R ⁵ is linear, the affinity to the cellulose ester resin is likely to be enhanced. For this reason, when the alkylene group represented by R ⁵ is linear and the carbon number is in the above range, when the substitution degree is in the above range, the squeal at the time of molding of the resin composition is further suppressed and the steel of the resin molded body The ball drop strength is further improved. In addition, the moldability of the resin composition is further improved.
From these viewpoints, in particular, the alkylene group represented by R ⁵ is preferably an n-butylene group (— (CH ₂ ) ₄ —). In other words, a polyether ester compound, as ^{R 5} n-butylene _{(- (CH 2) 4 -} ) is preferably a compound which represents the.

The alkyl group represented by A ¹ and A ^{2 in the} general formula (2) is preferably an alkyl group having 1 to 10 carbon atoms, and more preferably an alkyl group having 2 to 8 carbon atoms. The alkyl group represented by A ¹ and A ² may be linear, branched or cyclic, and is preferably branched.
Examples of the aryl group represented by A ¹ and A ² include unsubstituted aryl groups such as a phenyl group and a naphthyl group; and substituted phenyl groups 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. R ^A represents a linear or branched alkylene group having 1 to 6 carbon atoms (preferably 2 to 4 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 6 carbon atoms). Specific examples of the aralkyl group include unsubstituted aralkyl groups such as benzyl group, phenylmethyl group (phenethyl group), phenylpropyl group and phenylbutyl group; substituted aralkyl groups such as methylbenzyl group, dimethylbenzyl group and methylphenethyl group Groups are mentioned.

It is desirable that at least one of A ¹ and A ² 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, it is a compound that represents a phenyl group) or an aralkyl group [particularly, an aryl group (desirably a phenyl group)]. The polyether ester compound which represents an aryl group (desirably a phenyl group) or an aralkyl group as at least one of A ¹ and A ² tends to generate an appropriate space between the molecules of the cellulose ester resin, and further causes crystallization of cellulose. Suppress. For this reason, the squeal at the time of shaping | molding of a resin composition is further suppressed, and the steel ball drop strength of a resin molding is further improved. In addition, the moldability of the resin composition is further improved.

In General Formula (2), the range of m is not particularly limited, but is preferably 1 or more and 5 or less, and for example, 1 or more and 3 or less.
When m is 1 or more, it is difficult to bleed (deposit) the polyether ester compound. When m is 5 or less, affinity with the cellulose ester resin is likely to be enhanced. For this reason, when m is in the above range, the squeal at the time of molding of the resin composition is further suppressed, and the steel ball drop strength of the resin molded product is further improved. In addition, the moldability of the resin composition is further improved.

  Next, the characteristics of the polyether ester compound will be described.

The weight average molecular weight (Mw) of the polyether ester compound is preferably 450 or more and 650 or less, and more preferably 500 or more and 600 or less.
When the weight average molecular weight (Mw) is 450 or more, bleeding (the phenomenon of precipitation) is difficult. When the weight average molecular weight (Mw) is 650 or less, affinity with the cellulose ester resin is likely to be enhanced. For this reason, when the weight average molecular weight (Mw) is in the above range, the squeal at the time of molding of the resin composition is further suppressed, and the steel ball drop strength of the resin molded product is further improved. In addition, the moldability of the resin composition is further improved.
In addition, a weight average molecular weight (Mw) is a value measured by a gel permeation chromatograph (GPC). Specifically, the molecular weight measurement by GPC is carried out using a Tosoh column, HPLC 1100, as a measuring device, using a Tosoh column, TSKgel GMHHR-M + TSKgel GMHHR-M (7.8 mm ID 30 cm), using a chloroform solvent . And a weight average molecular weight is computed using the molecular weight calibration curve created by the monodispersed polystyrene standard sample from this measurement result.

The viscosity at 25 ° C. of the polyether ester compound is preferably 35 mPa · s or more and 50 mPa · s or less, and more preferably 40 mPa · s or more and 45 mPa · s or less.
When the viscosity is 35 mPa · s or more, the dispersibility in the cellulose ester resin is likely to be improved. When the viscosity is 50 mPa · s or less, the anisotropy of dispersion of the polyether ester compound hardly appears. For this reason, when the viscosity is in the above range, the squeal at the time of molding of the resin composition is further suppressed, and the steel ball drop strength of the resin molded product is further improved. In addition, 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 polyether ester compound is preferably 9.5 or more and 9.9 or less, and more preferably 9.6 or more and 9.8 or less.
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. For this reason, when the solubility parameter (SP value) is in the above range, the squeal at the time of molding of the resin composition is further suppressed, and the steel ball drop strength of the resin molded product is further improved. In addition, 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, Polym. Eng. Sci. , Vol. 14, p. Based on the description in 147 (1974), the SP value is calculated by the following equation.
Formula: SP value = √ (Ev / v) = √ (ΣΔei / ΣΔvi)
(Wherein 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) adopts (cal / cm ³ ) ^1/2 as a unit, but the unit is omitted in accordance with the practice, and is written without dimension.

Here, the polyether ester compound represents an n-butylene group as R ⁵ , in particular, from the viewpoint of suppression of squeal at the time of molding of the resin composition and improvement of the steel ball falling strength of the resin molded product, A ¹ and wherein an aryl group or an aralkyl group as at least one of a ^2, and the weight average molecular weight (Mw), is preferable compound is 450 or more 650 or less.
From the same point of view, the polyether ester compound is preferably a compound having a viscosity of 35 mPa · s to 50 mPa · s at 25 ° C. and a solubility parameter (SP value) of 9.5 to 9.9.

  Hereinafter, although the specific example of a polyether ester compound is shown, it is not necessarily limited to this.

[Polyolefin resin]
The resin composition according to the present embodiment contains a polyolefin resin.

The polyolefin resin may, for example, be a polymer of one kind of olefin or a copolymer of two or more kinds of olefins.
Examples of the olefin include linear or branched aliphatic olefins and alicyclic olefins. The linear or branched aliphatic olefins have 2 to 18 carbon atoms (preferably 2 to 12 carbon atoms). And aliphatic olefins. Specifically, as an aliphatic olefin, for example, ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-hexadecene, 1-octadecene and the like An alpha-olefin is mentioned.
Examples of the alicyclic olefin include alicyclic olefins having 4 to 8 carbon atoms (desirably, 4 to 6 carbon atoms). Specifically, examples of alicyclic olefins include cyclopentene, cycloheptene, norbornene, 5-methyl-2-norbornene, tetracyclododecene, vinylcyclohexane and the like.
Among these, as the polyolefin, an aliphatic olefin having a carbon number of 2 or more and 6 or less is preferable from the viewpoint of suppression of the squeal at the time of molding of the resin composition and improvement of the steel ball falling strength of the resin molded body.

The weight-average molecular weight (Mw) of the polyolefin resin is preferably 20000 or more and less than 15,000, and more preferably 30,000 or more and 50000 or less.
When the weight average molecular weight (Mw) is 20000 or more and less than 50000, the squeal at the time of molding of the resin composition is further suppressed, and the steel ball drop strength of the resin molded product is further improved.
The weight average molecular weight is a value measured by the same method as the method of measuring the weight average molecular weight of the polyether ester compound.

  Hereinafter, although the specific example of polyolefin resin is shown, it is not necessarily limited to this.

[Contents of Cellulose Ester Resin, Polyether Ester Compound, and Polyolefin Resin]
The mass ratio of the cellulose ester resin to the polyether ester compound (cellulose ester resin / polyether ester compound) is preferably 100/25 to 100/5, and more preferably 100/20 to 100/9.
When the mass ratio is 100/25 or more, it is difficult for the polyether ester compound to bleed (precipitate). When the mass ratio is 100/5 or less, the anisotropy of the dispersion state of the cellulose ester resin is eliminated, the isotropy increases, and the intermolecular force between the cellulose ester resins also weakens. Moreover, the fall of the fluidity | liquidity of a resin composition is suppressed and it becomes easy to express thermoplasticity. For this reason, when the mass ratio is in the above range, the squeal at the time of molding of the resin composition is further suppressed, and the steel ball drop strength of the resin molded product is further improved. In addition, the moldability of the resin composition is further improved.

The mass ratio of the cellulose ester resin to the polyolefin resin (cellulose ester resin / polyolefin resin) is preferably 100/8 or more and 100/2 or less, and more preferably 100/5 or more and 100/3 or less.
When the mass ratio is 100/8 or more, the steel ball drop strength is easily improved. When the mass ratio is 100/2 or less, the noise at the time of molding of the resin composition is easily suppressed. For this reason, when the mass ratio is in the above range, the squeal at the time of molding of the resin composition is further suppressed, and the steel ball drop strength of the resin molded product is further improved. In addition, the moldability of the resin composition is further improved.

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

[Other ingredients]
The resin composition according to the present embodiment may further contain other components other than those described above, as necessary. Other components include, for example, flame retardants, compatibilizers, plasticizers, antioxidants, mold release agents, light resistance agents, weathering agents, colorants, pigments, modifiers, anti-drip agents, anti-static agents, resistance Hydrolysis inhibitors, fillers, reinforcing agents (glass fiber, carbon fiber, talc, clay, mica, glass flakes, milled glass, glass beads, crystalline silica, alumina, silicon nitride, alumina nitride, boron nitride, etc.), etc. Can be mentioned. The content of each of these components is desirably 0% by mass or more and 5% by mass or less with respect to the entire resin composition. Here, "0 mass%" means that other components are not included.

The resin composition according to the present embodiment may contain another resin other than the above resin. However, it is preferable that the other resin is contained in an amount of 5% by mass or less in the total resin.
Other resins include, for example, conventionally known thermoplastic resins, and specifically, polycarbonate resins; polypropylene resins; polyester resins; polyester carbonate resins; polyphenylene ether resins; polyphenylene sulfide resins; polysulfone resins; Sulfone resin; Polyarylene resin; Polyether imide resin; Polyacetal resin; Polyvinyl acetal resin; Polyketone resin; Polyether ketone resin; Polyether ether ketone resin; Polyaryl ketone resin; Polyether nitrile resin; Liquid crystal resin; Polybenzimidazole resin Polyparabanic acid resin; at least one vinyl selected from the group consisting of aromatic alkenyl compounds, methacrylic acid esters, acrylic acid esters, and vinyl cyanide compounds Vinyl polymer or copolymer resin obtained by polymerizing or copolymerizing a monomer; diene-aromatic alkenyl compound copolymer resin; vinyl cyanide-diene-aromatic alkenyl compound copolymer resin; aromatic Alkenyl compound-diene-vinyl cyanide-N-phenyl maleimide copolymer resin; vinyl cyanide- (ethylene-diene-propylene (EPDM))-aromatic alkenyl compound copolymer resin vinyl chloride resin; chlorinated vinyl chloride resin And the like. One of these resins may be used alone, or two or more thereof may be used in combination.

[Method of producing resin composition]
The resin composition which concerns on this embodiment is manufactured by melt-kneading the mixture of the said component, for example. In addition, the resin composition concerning this embodiment is manufactured by dissolving the above-mentioned ingredient in a solvent, for example. Examples of the means for melt-kneading include known means, and specific examples thereof include a twin-screw extruder, a Henschel mixer, a Banbury mixer, a single-screw extruder, a multi-screw extruder, and a coneda.

<Resin molding>
The resin molded product 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 is configured to have the same composition as the resin composition according to the present embodiment.
Specifically, the resin molded product 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, heat press molding, calender molding, coating molding, cast molding, dipping molding, vacuum molding, transfer molding, etc. may be applied.

  The molding method of the resin molded product according to the present embodiment is preferably injection molding in that the degree of freedom of the shape is high. In particular, it is preferable to apply injection molding from the viewpoint of obtaining a resin molded product excellent in steel ball drop strength by making use of the moldability (thermoplasticity and flowability) of the resin composition according to the present embodiment. The cylinder temperature for injection molding is, for example, 200 ° C. or more and 250 ° C. or less, and desirably 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. The injection molding may be performed using, for example, a commercially available apparatus such as NEX150 manufactured by Nissei Plastics Co., Ltd., NEX 700000 manufactured by Nisshin Plastics Co., Ltd., and SE50D manufactured by Toshiba Machinery.

  The resin molded product according to the present embodiment is suitably used for applications such as electronic and electrical equipment, office equipment, home appliances, automobile interior materials, and containers. More specifically, casings of electronic / electrical devices and home appliances; various parts of electronic / electrical devices and home appliances; interior parts of automobiles; storage cases such as CD-ROMs and DVDs; tableware; beverage bottles; food trays Wrap material; film; sheet;

  EXAMPLES The present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

<Examples 1 to 34, Comparative Examples 1 to 10>
[Kneading]
Materials having the compositions shown in Tables 1 and 2 are charged into a twin-screw kneader (TEX 41 SS manufactured by Toshiba Machine Co., Ltd.), and the cylinder temperature is kneaded in a range of 220 ° C. or more and 250 ° C. or less. (Referred to as In Tables 1 and 2, "part" means "part by mass".

[injection molding]
The obtained pellet is introduced into an injection molding machine (Nixen Resin Industries, PNX40), and injection molding is performed at a cylinder temperature in the range of 220 ° C. to 250 ° C. and a mold temperature in the range of 40 ° C. to 60 ° C. A D2 molded body (length 60 mm, width 60 mm, thickness 2 mm) was obtained.

[Evaluation]
While evaluating the squeal at the time of shaping | molding, the steel ball drop strength was evaluated about the obtained D2 test piece. The results are shown in Tables 1 and 2.

-Squeal during molding-
Squeal at the time of molding was evaluated by whether or not abnormal noise generated from the screw of the injection molding machine was generated.

-Steel ball drop strength-
A steel ball weighing 500 g was dropped and collided through a vinyl chloride pipe on a D2 test piece, and the falling height when cracking occurred was recorded and evaluated as the steel ball drop strength.

  From the above results, it is understood that in the present example, the evaluation results of the noise at the time of molding and the falling strength of the iron ball are both good as compared with the comparative example.

The material types in Tables 1 and 2 are as follows.
Compounds 1 to 8: Specific examples of the cellulose ester resin described above Compounds 8 to 23: specific examples of the polyether ester compound described already Compounds 24 to 26: specific examples of the polyolefin resin described already 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 (18)

The resin composition containing cellulose ester resin, the polyether ester compound represented by following General formula (2), and polyolefin resin.

(In 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 have 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 18 carbon atoms, m represents an integer of 1 or more) 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 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 which each of R ¹ , R ² and R ³ independently represents, and the degree of substitution is 2.1 or more. The resin composition according to claim 2, which is a resin of 6 or less. The polyether ester compound represented by the general formula (2) is a resin composition according to any one of the R is a compound representing an n- butylene group as ⁵ claims 1 to 3. The polyether ester compound represented by the said General formula (2) is a compound which represents an aryl group or an aralkyl group as at least one of said A ¹ and said A ² to any one of Claims 1-4. The resin composition as described. The weight average molecular weight (Mw) of the said polyetherester compound is 450-650, The resin composition of any one of Claims 1-5 . The viscosity at 25 degrees C of the said polyether ester compound is 35 mPa * s or more and 50 mPa * s or less, The resin composition of any one of Claims 1-6 . The resin composition according to any one of claims 1 to 7 , wherein the solubility parameter (SP value) of the polyether ester compound is 9.5 or more and 9.9 or less. The resin composition according to any one of claims 1 to 8 , wherein the weight average molecular weight of the polyolefin resin is from 20,000 to less than 50,000. Mass ratio of said cellulose ester resin The polyether ester compound (cellulose ester resin / polyether ester compound), according to any one of claims 1 to 9 is 100/25 or 100/5 or less Resin composition. The resin composition according to any one of claims 1 to 10 , wherein a mass ratio of the cellulose ester resin to the polyolefin resin (cellulose ester resin / polyolefin resin) is 100/8 or more and 100/2 or less. .   The resin composition according to any one of claims 1 to 11, wherein the degree of substitution of the cellulose ester resin is 2.2 or more and 2.5 or less.   The weight average molecular weight of a cellulose ester resin is 100,000 or more and 300,000 or less, The resin composition of any one of Claims 1-12.   The weight average molecular weight of cellulose ester resin is 150,000 or more and 200,000 or less, The resin composition of any one of Claims 1-13.   The polyether ester compound represented by the general formula (2) is ⁴ As the alkylene group having 3 or more carbon atoms, the above R ⁵ The resin composition according to any one of claims 1 to 3, which is a compound representing an alkylene group having 3 or more carbon atoms as The polyether ester compound represented by the general formula (2) is ⁴ The resin composition according to any one of claims 1 to 15, which is a compound representing n-hexylene group as The polyether ester compound represented by the general formula (2) is ⁴ Or a compound representing an alkylene group having 10 or less carbon atoms as ⁴ The resin composition according to any one of claims 1 to 16, which is a compound representing a linear alkylene group as Resin molding comprising the resin composition according to any one of claims 1 to 17.