JP2002030182A - Acetyl cellulose resin composition and its production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biodegradable or lowly environmental loading acetyl cellulose resin composition which can widely be applied in the field of molding materials obtained by melt molding, and a method of producing the same. SOLUTION: The acetyl cellulose resin composition comprises 100 pts.wt. acetyl cellulose resin having biodegradability and a degree of substitution of acetyl groups of 1.9-2.6 and 5-100 pts.wt. mixture of specific glycerin derivative based plasticizers, and the acetyl cellulose resin composition can be obtained by hotting up the above composition raw materials at 60 deg.C-120 deg.C to effect blending.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acetylcellulose resin composition and a method for producing the same, and more particularly, to a molding obtained by melt molding such as injection molding, extrusion molding, profile extrusion molding, blow molding, and film / sheet molding. The present invention relates to a biodegradable or low environmental load acetylcellulose resin composition which can be widely applied to the field of materials and a method for producing the same.

[0002]

2. Description of the Related Art Synthetic resins synthesized from petroleum raw materials, such as polyethylene, polypropylene, polystyrene, vinyl chloride, polyester, and polyamide, are widely used from necessities of daily life to industrial products. The convenience and economy of these synthetic resins have greatly supported our lives, and synthetic resins have become the basis of the petrochemical industry. As a result, the amount of synthetic resin produced domestically reaches about 15 million tons annually, about one-third of which.
Huge amounts of waste have been disposed of, and waste disposal by incineration and landfill has reached its limit. In recent years, movements such as resource collection and recycling have become active.
Regarding the Containers and Packaging Recycling Bill that will be enforced from 0 years,
It is expected that the addition of a new synthetic resin will require strong and efficient recovery and reuse of the synthetic resin. However, in view of the huge synthetic resin production, it remains difficult to recycle, for example, it is used for applications that are difficult to collect, and it is unlikely that it can be sufficiently collected and reused. In addition, synthetic resin products that dissipate in the natural environment are becoming more prominent year by year, and have become a major social problem, such as an increase in the need for protection of wild animals and destruction of the living environment.

[0003] Such environmental issues are becoming more and more important year by year, and the government, including the Environment Agency, and local governments need to take serious measures. In the synthetic resin market, the demand for degradability in the natural environment has become active, and biodegradable resins have been developed that will eventually be decomposed and used even if dumped outdoors. Also, on the other hand,
In order to prevent toxic gas generated during incineration of synthetic resins, materials that are closer to nature are being demanded, and demand for biodegradable resins is increasing as part of incineration measures.

[0004] Biodegradable resins are used in soil, seawater, rivers,
A resin that can be degraded by microorganisms in lakes and marshes.In addition to the demand for direct contact with the natural environment, the recycling of synthetic resin waste is inefficient and costly. . With respect to measures against dissipative dust, biodegradable resins are increasingly recognized for their value, and it is expected that their use will further expand in the future. At present, the construction of commercial compost is progressing in various places, while the sale of household compost to individual consumers has begun, and the development of biodegradable materials is expected in various places. In addition, the Ministry of International Trade and Industry has established a practical use review committee, and activities to promote biodegradable materials have been activated. Furthermore, it is predicted that a large part of the world's demand for synthetic resins with a production volume of 100 million tons will be occupied by biodegradable resins, and the 21st century will be a full-fledged biodegradable market in the 21st century. Is expected to spread. As biodegradable materials and environmentally friendly materials that are currently in practical use,
BACKGROUND ART Aliphatic polyesters, modified starch, polylactic acid, various composite materials using these resins as a matrix, polymer alloys, and the like are known.

[0005] In recent years, it has been discovered that acetylcellulose resin has a biodegradable function. However, acetylcellulose resin can be handled at a lower cost than other biodegradable resins and does not depend on petroleum resources. Therefore, the demand is expected to increase rapidly. Acetyl cellulose resin used as such a biodegradable material is disclosed in JP-A-4-142344 and JP-A-6-492.
No. 75, JP-A-9-241425, and the like. However, acetylcellulose resin is melt-processed by various molding methods like general-purpose synthetic resin,
There are several problems in obtaining molded articles. For example, the melting point of acetylcellulose resin is around 280 ° C., which is higher than the decomposition point, and a large amount of a plasticizer must be mixed in order to lower the melting point to a temperature suitable for melt processing. However, the acetylcellulose resin not only changes the melting behavior but also slightly changes the compatibility with the plasticizer as the acetyl group substitution degree changes. Accordingly, there is no acetylcellulose resin plasticizer that is optimal for all acetyl group substitution degree ranges. In addition, if a large amount of a plasticizer is added, the moldability is reduced. Furthermore, unlike ordinary synthetic resins, there are many problems in melt processing, such as being easily susceptible to thermal degradation by pelletizing to obtain the composition, and easily generating irritating acetic acid gas during melting. .

[0006] Plasticizers having good compatibility with acetylcellulose resin include dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DB).
Phthalate plasticizers such as P) are generally known. However, although the phthalate plasticizer has excellent compatibility with the acetylcellulose resin, it has a strong irritating odor due to the gas generated by volatilization and decomposition of the plasticizer during melting, and the resin after kneading in the compound manufacturing operation. There is a problem in the working environment such as the plasticizer separated from the composition floating on the surface of the cooling water tank into which the composition is charged. As other plasticizers, polyethylene glycol, polypropylene glycol, and the like are common examples of glycol-based plasticizers. These glycol-based plasticizers have poor plasticizing ability of acetylcellulose resin, cannot be mixed in large amounts, and have problems such as separation of acetylcellulose and plasticizer during compound manufacturing and melt molding. is there. Further, there is a problem that melt stability is low in obtaining a uniform and smooth molded product, the melt cannot be uniformly melted, and melt fracture (unevenness on the molded product surface) occurs on the surface of the molded product. In addition, the plasticizer bleeds out on the surface of the molded product due to the influence of environmental humidity and temperature.

Further, triphenyl phosphate (TP)
Phosphate-based plasticizers represented by P) are also used. However, a considerably large amount of mixing is required for plasticization and stabilization. There's a problem. Furthermore, as an aliphatic plasticizer, for example, adipic acid ester is used because it has a biodegradable function, but it is generally poorly compatible with acetylcellulose resin and is used only for an adipic acid ester having a considerably low molecular weight. Can not do it. Moreover, even when used for a low molecular weight adipic ester, it cannot be mixed in a large amount, lacks melt stability of the composition, cannot be uniformly melted, and it is difficult to obtain a stable molded product.
Furthermore, triacetylglycerides in which three hydroxyl groups are acetylated, so-called triacetin, are also known as plasticizers. However, when using triacetin alone as a plasticizer, a considerably large amount of mixing is required in order to obtain processing stability, and there is a problem that the physical properties of the composition are reduced. Further, the compatibility of the acetylcellulose resin with the plasticizer varies depending on the degree of acetyl group substitution. Therefore, when the above-mentioned known plasticizer is used alone for an acetylcellulose resin having a wide degree of acetyl substitution, the improvement in melt processability is limited, and acetylcellulose having a wide degree of acetyl substitution is limited. It is difficult to obtain a melt-formed product made of a resin.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides a molding material obtained by melt molding by injection molding, extrusion molding, profile extrusion molding, blow molding, film / sheet molding, or the like. An object of the present invention is to provide a biodegradable or low environmental load type acetylcellulose resin composition which can be widely applied to the field, and a method for producing the same.

[0009]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that the above problems can be solved by adding a specific glycerin derivative-based plasticizer to an acetylcellulose resin in combination. And completed the present invention. The present invention provides (A) a plasticizer represented by the following general formula (1), based on 100 parts by weight of an acetylcellulose resin having a biodegradable acetyl group substitution degree of 1.9 to 2.6; And (C) a plasticizer represented by the following general formula (2) in a proportion of (B) :( C) of 1 to 99% by weight: 99 to 1% by weight [however, (B) + (C) = 10
0% by weight], and 5 to 100 parts by weight of a plasticizer mixture obtained by mixing to obtain an acetylcellulose resin composition. (In the above formula, R ^{1 to} R ³ are the same or different and each have 2 carbon atoms.
And / or an acyl group having 8 to 14 carbon atoms, at least one of which is an acyl group having 8 to 14 carbon atoms. ) (In the above formula, R ^{4 to} R ⁶ are the same or different and are a hydrogen atom and / or an acyl group having 2 carbon atoms, and at least one is an acyl group having 2 carbon atoms.) The components (A) to (C) are mixed at 60 ° C to 1
The present invention relates to a method for producing the acetylcellulose resin composition, which is heated to 20 ° C. and blended.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Acetyl cellulose resin can be said to be a low environmental load type polymer material because it has lower combustion calories and does not generate toxic decomposition gas than ordinary synthetic resins. Acetyl cellulose resin in the present invention,
Normal acetyl cellulose resin can be used,
For example, refined cotton linter or high-purity wood pulp is used as a raw material. As an industrial production method of acetylcellulose resin, a mixed acid method, a methylene chloride method, a benzene method and the like are known, but a mixed acid method is generally used, and a cellulose raw material is subjected to a pretreatment, an acetylation reaction (an acetylation reaction). ), Subjected to a saponification ripening reaction, followed by a washing / purification / dehydration / drying step. The degree of the acetylation is adjusted by controlling the hydrolysis conditions in the deacetylation reaction performed in the aging reaction step, and an acetylcellulose resin having a desired degree of acetyl group substitution is obtained.

The acetylcellulose resin used in the present invention has an acetyl group substitution degree of 1.9 to 2.6, preferably 1.
9 to 2.5, more preferably 1.9 to less than 2.3. If it is less than 1.9, the production productivity is remarkably reduced, and the yield is reduced. On the other hand, if it exceeds 2.6, the biodegradability becomes slow. When the acetyl group substitution degree is within the scope of the present invention,
It has a high biodegradation rate and is preferable as a biodegradable resin.

The plasticizer mixture used in the present invention is a mixture of glycerin derivatives, and (B) at least one plasticizer selected from the group of compounds represented by the general formula (1); C) It is obtained by mixing at least one plasticizer selected from the group of compounds represented by the general formula (2) so as to have a compounding ratio within a specific range. The component (B) is a glycerin derivative having at least one acyl group having 8 to 14 carbon atoms, and the component (C) is a glycerin derivative having at least one acyl group having 2 carbon atoms. Examples of the component (B) include monocapryl diacetyl glyceride, monolauryl diacetyl glyceride, dilauryl monoacetyl glyceride, and the like. The component (B) may be used alone or in combination.
More than one species can be used in combination. Examples of the component (C) include acetyl monoglyceride and triacetyl glyceride. As the component (C), one type can be used alone, or two or more types can be used in combination. The above (B)
Component: The compounding ratio of component (C) is (B) + (C) = 10
As 0% by weight, it is 1-99% by weight: 99-1% by weight, preferably 5-95% by weight: 95-5% by weight, more preferably 10-90% by weight: 90-10% by weight.
If the compounding ratio of the component (B) and the component (C) is outside the above range, there are problems such as difficulty in processing stability of the compound and molding stability of the molded product, and wide processing of the acetylcellulose resin composition. It is difficult to respond to the situation.

The amount of the plasticizer mixture comprising the components (B) and (C) is 5 to 100 parts by weight, preferably 10 to 80 parts by weight, more preferably 20 to 60 parts by weight, per 100 parts by weight of the acetylcellulose resin. Parts by weight. If the compounding amount is less than 5 parts by weight, mixing, kneading, and molding cannot be performed unless the processing temperature is increased,
Thermal degradation of the resin accelerates, coloring becomes strong, and acetic acid gas is easily generated. On the other hand, if it exceeds 100 parts by weight,
When compounding the plasticizer mixture to the acetylcellulose resin,
Since it takes a long time to mix with the resin, the compound productivity is reduced, and it becomes difficult to adjust the appearance and dimensional properties of the molded product depending on the processing conditions.

An organic or inorganic filler containing another polymer material may be arbitrarily added to the composition of the present invention comprising the acetylcellulose resin and the plasticizer mixture, as long as the effects of the present invention are not impaired. Absent. The composition of the present invention comprises:
Especially for the purpose of biodegradability, environmental load, organic additives such as optionally added polymer materials,
Those that have biodegradable properties or are harmless to nature are preferred. For example, examples of the polymer material include aliphatic polyester, microbial polyester, polycaprolactone, polylactic acid, modified starch, and polyesteramide. In addition, lubricants of organic substances, stabilizers of metal salts such as calcium and magnesium, glycol-based, fatty acid-based wax, petroleum-based wax and the like can be added. Examples of the coloring agent include red iron oxide, carbon black, and titanium oxide. As inorganic fillers, calcium carbonate, talc, mica, calcium silicate derived from natural ore,
In addition to silica, special fillers such as barium sulfate and metal powder can also be used. Most inorganic fillers are generally harmless, and can be added as appropriate according to the purpose. In addition to the above fillers, it is also possible to blend purified pulp, starch, wood flour, rice hulls, etc. according to the purpose as a natural filler, and these organic, inorganic and natural fillers only enhance the biodegradability function. However, it is also effective in reducing the cost of expensive biodegradable resin.

The composition of the present invention can be directly melt-molded after melt-kneading. However, the method is preferably a method of molding from a pelletized compound, which is a normal secondary processing raw material form, and when various fillers other than the acetylcellulose resin and the plasticizer mixture are mixed, the various components are uniformly predispersed. As a result, the stability of the resin composition can be obtained.

As a mixer used in the processing of the pellet compound, a blender for the purpose of preliminary dispersion, distribution and diffusion mixing is used as the preliminary mixer.
Typical examples of the blender include a ribbon blender, a Henschel mixer (super mixer), a tumbler mixer, a tumble mixer, and an air blender. These pre-mixers are selected according to the form and diffusion level of the plasticizer and auxiliary materials to be filled, but a ribbon blender and a Henschel mixer are desirable for mixing the acetylcellulose resin and the plasticizer mixture, and A blender that can heat the composition with steam, electricity, or the like is preferred.

When producing the composition of the present invention, the plasticizer mixture is added to the acetylcellulose resin using a premixer, and the resulting composition is preferably heated to 60 ° C to 12 ° C.
Blending by hot-up to 0 ° C, more preferably 70 to 90 ° C, facilitates uniform mixing of the plasticizer composition and the resin, thereby improving productivity and stability of the resin composition against melt processing. Is improved. If the hot-up temperature is less than 60 ° C., the plasticizer composition is not sufficiently homogeneously mixed, so that stickiness occurs, which hinders supply to the kneader, impairs productivity, and causes melting of the resin composition. It becomes uneven. On the other hand, the hot-up temperature is 120 ° C
When it exceeds, the resin melts in the premixer and becomes a lump, which also makes it impossible to supply the kneader.

The melt kneading machine is generally a single-screw or twin-screw extruder, a Banbury type, a roll type, or the like. These can also be selected according to the form, purpose, and productivity of the composition, and melt-kneaded to produce the composition of the present invention. After the melt-kneading, the molten resin composition is extruded onto a string, put into a cooling water tank, cooled, and then pelletized by a pelletizer.

The composition of the present invention is melted in each molding machine,
Molding by various molding machines such as injection molding, extrusion molding including profile extrusion, blow molding, calender molding, vacuum molding, embossing molding, and film / sheet molding is possible.
The molding machine may be of a general specification commonly used.
For example, in the case of injection molding, a general injection molding machine can be used. In general, the use of the compound in the form of pellets results in good finished products and stable physical performance. Thus, the molding method of the composition of the present invention can be selected according to the use.

In any of the molding processes, care must be taken for the moisture absorption of the raw material, and predrying and measures for absorbing moisture during molding are important. If drying is insufficient, the melt foams and the appearance and physical properties of the molded article are reduced. Also, impregnation of the plasticizer mixed with the acetylcellulose resin becomes insufficient,
Variation in the melt viscosity may impair the appearance of the molded article. Drying before molding is desirably preliminarily dried by a hot air method or a vacuum vacuum method, and it is desirable to prevent moisture absorption by a hopper dryer or the like during molding.

[0021]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In the examples, parts and%
Are by weight unless otherwise indicated.

Sample Preparation (A) Component: An acetylcellulose resin manufactured by Daicel Chemical Industries, Ltd. having an acetyl group substitution degree of 2.0
Were used as (A-1), 2.2 as (A-2) and 2.5 as (A-3). (B) Component: Monocapryl diacetyl glyceride manufactured by Riken Vitamin Co., Ltd. was used. (C) Component: A monoacetyl glyceride manufactured by Riken Vitamin Co., Ltd. was used. Triacetin (triacetylglyceride) manufactured by Daihachi Chemical Co., Ltd. was used.

Conventional plasticizers: phthalate plasticizers such as dimethyl phthalate (DM) manufactured by Daihachi Chemical Co., Ltd.
E), diethyl phthalate (DEP), and dibutyl phthalate (DBP) were used. As a glycol plasticizer,
Adeka polyether P-400 manufactured by Asahi Denka Kogyo Co., Ltd.
(Number average molecular weight = 400), ADEKA polyether P-1
000 (number average molecular weight = 1,000) was used. As a phosphate ester plasticizer, triphenyl phosphate (TPP) manufactured by Daihachi Chemical Co., Ltd. was used.

Sample Preparation Method As a premixer, a Henschel mixer was used.
(A) component and a predetermined plasticizer are blended in a predetermined ratio,
The heating and stirring operation was performed until the composition temperature reached 70 to 90 ° C. As a kneader, using a twin screw extruder with a screw diameter of 47 mm and the same direction, a cylinder set temperature of 180 to 200 ° C.
And melt kneading was performed. The molten resin composition is extruded in a string shape, cooled by water cooling, and then sent to a pelletizer,
Pellets were made.

Premixing workability The fluidity of the composition during the heating and stirring operation using a premixer,
The presence or absence of irritant gas generation was evaluated. The evaluation criteria are as follows. Good flowability : A state in which the resin powder in the composition is uniformly mixed with a plasticizer and other additives. Normal: The composition is slightly lump but can be supplied to the kneading machine. Poor: The composition is melted and lump and uneven, or it is difficult to mix the resin powder and the plasticizer mixture. The state in which supply to the kneader is impossible due to the occurrence. In the case of a defect, kneading and pellet preparation could not be performed, so that kneading workability, appearance of a molded product, and the like could not be evaluated. Gas generation: The presence or absence of generation of a gas having an irritating odor such as acetic acid odor and alcohol odor was evaluated.

Kneading workability The uniformity of melting of the composition during the melt-kneading operation using the kneading machine, the presence or absence of irritating gas, the large load of the motor for operating the kneading machine, and the ease of supply to the feeder (operation Sex) was evaluated. The evaluation criteria are as follows. Good meltability : Melt-kneading of the composition is uniform Normal: Knead composition has some melting defects, but can be processed Poor: The composition melts unevenly and cannot be processed Gas generation The presence or absence of generation of gas having an irritating odor such as acetic acid odor and alcohol odor was evaluated. Motor load; good: The motor load of the twin-screw extruder is stable at less than 120A. Large: The motor load of the twin-screw extruder is 120 A or more, and supply of the material becomes unstable.

Injection molding processability (injection moldability) Injection molding is performed by using an injection molding machine with a mold clamping pressure of 80 t, setting the cylinder temperature to 180 to 200 ° C, and setting the mold temperature to 4 ° C.
Molding was performed at 0 ° C. Using a film gate type plate (width 6 × length 6 × thickness 0.3 cm), workability at the time of molding and appearance of the obtained molded product were evaluated. The evaluation criteria are shown below. Good workability : Injection pressure is less than 80% setting with respect to the maximum pressure. Poor: Injection pressure has more than 80% setting, the load on screw is high, metering is unstable, or plasticizer is contained in the composition. When separating. Good appearance of molded article : When no abnormalities are found on the surface of the molded article visually. Inferior: When the surface of the molded product is visually colored, or has flash marks, gloss unevenness, or bumps.

Extrusion processability (extrusion processability) Extrusion is performed by using a 20 mm single screw extruder, extruding at a cylinder setting temperature of 190 ° C. to 210 ° C., using a tape-shaped die at a screw rotation of 10 rpm, and workability. The appearance of the molded product was evaluated. The evaluation criteria are shown below. Good workability : Extrusion load (torque) is lower than 5 kg / cm ² . Normal: Extrusion load (torque) is 5 kg / cm ² Poor: Extrusion load (torque) exceeds 5 kg / cm ² . Good appearance of molded article : When no abnormalities are found on the surface of the molded article visually. Normal: When there is slight melt fracture on the surface of the molded product visually, but it can be used depending on the application. Poor: When there is visual unevenness in melting and melt fracture on the surface of the molded product.

Bleed-out evaluation method A film gate type plate having a width of 6 x length 6 x thickness of 0.3 cm was allowed to stand for 1 week at a temperature of 40 ° C and a relative humidity of 90% RH, and the plasticizer was applied to the plate surface. The presence or absence of bleed-out was visually observed. Evaluation method for biodegradability Basic culture water to which a buffer A solution, a magnesium sulfate solution B solution, a calcium chloride solution C solution, and an iron chloride solution D solution specified in JIS K0102 21 are added at a predetermined ratio is added to a culture bottle. 100 mg / L of a sample (composition of the present invention) powdered to 250 μm or less, and 30 mg / L of activated sludge as a suspended substance were added. Oxygen consumption was measured over time according to the aerobic biodegradability test method specified in JIS K6950, and the biochemical oxygen consumption (BOD) after 28 days was determined. Based on the BOD value, the decomposition rate (%) was determined by the following equation. Degradation rate (%) = [｛(BOD value of culture solution for target substance)-
(BOD value of culture solution for biological blank test) {/ theoretical oxygen demand] × 100 The evaluation criteria are as follows. Good; decomposition rate exceeds 60%. Normal; Decomposition rate is 60% Poor; Decomposition rate is less than 60%

Examples 1-6 Based on 100 parts of the component (A), 30 parts of the mixture of the components (B) and (C) were used to prepare the components (A)-
The composition of the component (C) was manufactured and evaluated. Examples 7 to 12 With respect to 100 parts of the component (A), 60 parts of the mixture of the components (B) and (C) were used as (A) to (B) of the types and formulations shown in Table 2.
The composition of the component (C) was manufactured and evaluated.

Comparative Examples 1 to 14 Compositions of components (A) to (C) of the types and blends shown in Tables 3 to 5 were produced as 100 parts of component (A) and 30 parts of a plasticizer mixture, and evaluated. did.

Comparative Examples 15 to 28 Compositions of components (A) to (C) of the types and formulations shown in Tables 6 to 8 were produced as plasticizer mixtures 60 parts with respect to 100 parts of component (A), and evaluated. did.

Examples 13 to 14 Compositions of components (A) to (C) of the kind and composition shown in Table 9 were produced and evaluated as 30 parts of a plasticizer mixture with respect to 100 parts of component (A).

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

[Table 3]

[0037]

[Table 4]

[0038]

[Table 5]

[0039]

[Table 6]

[0040]

[Table 7]

In the above Tables, in Comparative Examples 3, 10, 17, and 24, the plasticizer mixed with the resin floated in the cooling water tank after kneading. Further, Comparative Examples 4, 11, 17,
Although the fluidity of the pre-mixing workability of 25 was good, uniform mixing of the resin and the plasticizer mixture was somewhat difficult, and if good until uniform mixing, it was 20 to 30 minutes, but 30 minutes. It was necessary. The "slightly poor" fluidity of the premixing workability of Comparative Example 18 means that it is difficult to uniformly mix the resin powder and the plasticizer mixture, and it takes 30 minutes or more to uniformly mix, and it takes a considerable time. Indicates that Although the fluidity of the premixing workability of Comparative Example 20 was good, the composition was strongly sticky and the appearance of the extruded product showed some melt fracture. The "slightly poor" fluidity of the pre-mixing workability of Comparative Example 21 means that the composition was slightly dissolved to form a lump,
Indicates that the liquidity is somewhat poor. In the appearance of the extruded product of Comparative Example 27, slightly uneven melting and melt fracture were observed.

As shown in Tables 1 and 2 and Table 7, the plasticizer represented by the general formula (1) of the present invention and the plasticizer represented by the general formula (2) are prepared at a specific ratio. It is possible to cope with plasticization of the acetylcellulose resin composition at various acetyl group substitution degrees by using together, and to improve the productivity of the pellet-like compound by pre-mixing and kneading, injection molding, and molding processability such as extrusion molding. It is effective in stabilizing.

[0043]

According to the present invention, it is a biodegradable or environmentally-friendly resin that does not emit toxic gas even when incinerated and discarded, and is injection-molded, extruded, deformed, blow-molded, and film-formed. -An acetylcellulose resin composition suitable as a resin composition that can be used for sheet molding or the like can be provided.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaki Enomoto 3-11-5 Nihonbashi Honcho, Chuo-ku, Tokyo Inside RIKEN Vinyl Industrial Co., Ltd. (72) Inventor Ikuo Ogoshi 3-115 Nihonbashi Honcho, Chuo-ku, Tokyo No. RIKEN Vinyl Industrial Co., Ltd. F term (reference) 4F070 AA02 AC43 AE02 FA03 FA07 FB06 FC03 FC05 FC06 4J002 AB021 EH047 EH056 EH057 FD026 FD027 GE00

Claims (2)

[Claims] 1. A plasticizer represented by the following general formula (1): (A) 100 parts by weight of an acetylcellulose resin having a biodegradable acetyl group substitution degree of 1.9 to 2.6. And (C) a plasticizer represented by the following general formula (2), wherein the blending ratio of (B) :( C) is 1-99% by weight: 99.
１1% by weight [(B) + (C) = 100% by weight]
The plasticizer mixture obtained by mixing so that
An acetylcellulose resin composition characterized in that 0 part by weight is blended. (In the above formula, R ^{1 to} R ³ are the same or different and each have 2 carbon atoms.
And / or an acyl group having 8 to 14 carbon atoms, at least one of which is an acyl group having 8 to 14 carbon atoms. ) (In the above formula, R ^{4 to} R ⁶ are the same or different and are a hydrogen atom and / or an acyl group having 2 carbon atoms, and at least one is an acyl group having 2 carbon atoms.) 2. The components (A) to (C) are added at 60 ° C. to 1
The method for producing an acetylcellulose resin composition according to claim 1 or 2, wherein the acetylcellulose resin composition is heated to 20 ° C and blended.