JP2006206801A - Colored resin composition for microbiologically degradable resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microbiologically degradable resin composition having good pigment dispersibility. <P>SOLUTION: This colored resin composition for microbiologically degradable resins, comprising a thermoplastic resin, a pigment, and a pigment-dispersing agent, is characterized by using a lactic acid-based resin (A) as the thermoplastic resin and further a fatty acid amide and a fatty acid triglyceride as the pigment-dispersing agent. The colored resin composition for microbiologically degradable resins is also characterized by using one or more resins (B) selected from the group consisting of thermoplastic polyester resins, starch and modified starch as the thermoplastic resin and further a fatty acid amide and a fatty acid triglyceride as the pigment-dispersing agent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a colored resin composition for microbial disintegrating resins, and more particularly to a microbial disintegrating resin composition having excellent dispersibility.

  Thermoplastic resins are relatively inexpensive, lightweight, and have excellent corrosion resistance and processability. Today, their applications such as mechanical parts, precision parts, electrical / electronic equipment parts, daily goods, industrial parts, and textiles are being developed. There are a wide variety.

There are pigments and dyes as colorants for thermoplastic resins, but dyes may lack resistance such as color transfer and light resistance, and pigments are mainly used for general purposes.
The pigment is a granular material having a particle size of 0.1 to several tens of μm, and is kneaded and added to a molten resin to give a desired hue, but if the pigment particles are aggregated, a good colored state cannot be obtained, and a resin molded product The appearance of is lacking in beauty and sometimes impairs mechanical strength. Therefore, various pigment dispersants have been studied in order to prevent aggregation of pigment particles and to achieve a good dispersion state.

  In recent years, in addition to the characteristics of conventional thermoplastic resins, microbial disintegrating resins that are finally decomposed into water and carbon dioxide by microorganisms have been widely deployed in the market. The microorganism-disintegrating resin has corrosion resistance before being discarded in nature, but after being discarded, it is finally decomposed into water and carbon dioxide by the microorganisms in nature. Therefore, the microbial disintegration resin is a natural circulation type material as compared with the conventional microbial resistant polymer resin, and is expected to increase in demand from the viewpoint of reducing the environmental load.

  However, microbial disintegrating resins tend to have a lower pigment dispersibility than ordinary thermoplastic resins. If the pigment dispersibility is poor, there may be a problem that transparency or a good hue cannot be obtained in the microorganism-disintegrating resin molded product.

  There is a technique using a metal salt of a higher fatty acid as a pigment dispersant (Patent Document 1). However, the pigment dispersibility is not so good, and bloom (powder) may occur on the surface of the resin molded product.

  A technique using polyethylene wax as a pigment dispersant is disclosed (Patent Document 2). However, the melt tension was lowered when the film was formed, which was not preferable.

  Moreover, although the technique which uses fatty acid amide is also disclosed (patent document 3), aggregation of the pigment particles cannot be sufficiently prevented and a good dispersion state cannot be obtained.

JP 11-021438 A JP 2000-256606 A Japanese Patent Laid-Open No. 11-302460

  An object of the present invention is to provide a colored resin composition for a microbial disintegrating resin having excellent dispersibility.

The inventors of the present invention have arrived at the present invention as a result of intensive studies to solve the above-mentioned problems. That is,
(1) In a colored resin composition for a microorganism-disintegrating resin containing a thermoplastic resin, a pigment, and a pigment dispersant, a lactic acid resin (A) is used as the thermoplastic resin, and a fatty acid amide and a fatty acid triglyceride are used as the pigment dispersant. A colored resin composition for a microorganism-disintegrating resin to be used;
(2) In the colored resin composition for a microorganism-disintegrating resin containing a thermoplastic resin, a pigment, and a pigment dispersant, at least one selected from the group consisting of a thermoplastic polyester resin, starch, and modified starch is selected as the thermoplastic resin. Resin (B) is a colored resin composition for a microorganism-disintegrating resin using a fatty acid amide and a fatty acid triglyceride as the pigment dispersant.

  The colored resin composition for a microbial disintegrating resin of the present invention is a colored resin composition for a microbial disintegrating resin containing a thermoplastic resin, a pigment, and a pigment dispersant, wherein the lactic acid resin (A) is used as the thermoplastic resin. Since the fatty acid amide and the fatty acid triglyceride are used as the pigment dispersant, the pigment dispersibility is good.

  The colored resin composition for a microbial disintegrating resin according to the present invention is a colored resin composition for a microbial disintegrating resin containing a thermoplastic resin, a pigment, and a pigment dispersant. The thermoplastic resin is a thermoplastic polyester resin, starch, or modified starch. Since the fatty acid amide and the fatty acid triglyceride are used as the pigment dispersant for the resin (B) selected from at least one selected from the group consisting of the above, the pigment dispersibility is good.

<Lactic acid resin (A)>
The lactic acid resin (A) used in the present invention includes a polylactic acid copolymer in addition to a polylactic acid homopolymer. Further, it may be a blend polymer mainly composed of a polylactic acid homopolymer and / or a polylactic acid copolymer.

  The weight average molecular weight (Mw) of the lactic acid-based resin (A) is preferably 50,000 to 500,000, more preferably 100,000 to 250,000 in terms of polystyrene by GPC analysis. When the weight average molecular weight is less than 50,000, physical properties necessary for practical use may not be obtained. On the other hand, when the weight average molecular weight exceeds 500,000, moldability may be easily deteriorated.

  In addition, the constituent molar ratio L / D of the L-lactic acid unit and the D-lactic acid unit in the lactic acid-based resin (A) may be 100/0 to 0/100, but in order to obtain a high melting point, L -It is preferable to contain at least 75 mol% of units of lactic acid or D-lactic acid, and 90 mol% or more of either unit of L-lactic acid or D-lactic acid in order to obtain a higher melting point.

  The polylactic acid copolymer is obtained by copolymerizing a lactic acid monomer or other component copolymerizable with lactide. Other components include dicarboxylic acids having two or more ester bond-forming functional groups, polyhydric alcohols, hydroxycarboxylic acids, lactones, etc., and various polyesters, polyethers, polycarbonates, and the like comprising these components. Can be mentioned.

  Examples of dicarboxylic acids include succinic acid, adipic acid, azelaic acid, sebacic acid, terephthalic acid, isophthalic acid and the like.

  Examples of polyhydric alcohols include aromatic polyhydric alcohols such as those obtained by addition reaction of bisphenol with ethylene oxide, ethylene glycol, propylene glycol, butanediol, hexanediol, octanediol, glycerin, sorbitan, limethylolpropane, neopentyl glycol And aliphatic glycols such as diethylene glycol, triethylene glycol, polyethylene glycol, and polypropylene glycol.

  Examples of the hydroxycarboxylic acid include glycolic acid, hydroxybutylcarboxylic acid, and others described in JP-A-6-184417.

  Examples of the lactone include glycolide, ε-caprolactone glycolide, ε-caprolactone, β-propiolactone, δ-butyrolactone, β- or γ-butyrolactone, pivalolactone, and δ-valerolactone.

  The lactic acid resin (A) used in the present invention is synthesized by a conventionally known method. That is, direct dehydration condensation from a lactic acid monomer as described in JP-A-7-33861, JP-A-59-96123, Polymer Proceedings Proceedings Vol. 44, pages 3198-3199, or lactic acid cyclic dimer Can be synthesized by ring-opening polymerization of lactide.

  When performing direct dehydration condensation, any lactic acid of L-lactic acid, D-lactic acid, DL-lactic acid, or a mixture thereof may be used. Moreover, when performing ring-opening polymerization, you may use the lactide of any of L-lactide, D-lactide, DL-lactide, meso-lactide, or these mixtures.

  Lactide synthesis, purification and polymerization procedures are described, for example, in U.S. Pat. No. 4,057,537, published European Patent Application No. 261572, Polymer Bulletin, 14, 491-495 (1985) and Makromol Chem., 187, 1611-1628. (1986).

  The catalyst used for this polymerization reaction is not particularly limited, and a known catalyst for lactic acid polymerization can be used. For example, tin compounds such as tin lactate, tin tartrate, dicaprylate, dilaurate, dipalmitate, tin distearate, dioleate, α-naphthoate, β-naphthoate, tin octylate, etc., powder Tin powder, zinc oxide, zinc oxide, organic zinc compounds; titanium compounds such as tetrapropyl titanate; zirconium compounds such as zirconium isopropoxide; antimony compounds such as antimony trioxide; bismuth oxide Examples thereof include bismuth compounds such as (III); aluminum compounds such as aluminum oxide and aluminum isopropoxide.

  Among these, a catalyst made of tin or a tin compound is particularly preferable from the viewpoint of activity. For example, when ring-opening polymerization is performed, the amount of these catalysts used is preferably about 0.001 to 5% by weight with respect to lactide.

  Although the polymerization reaction varies depending on the type of catalyst in the presence of the catalyst, it can usually be carried out at a temperature of 100 to 220 ° C. It is also preferable to carry out two-stage polymerization as described in JP-A-7-247345.

  Specific examples of the lactic acid resin (A) include commercially available microbial disintegrating resins such as polylactic acid manufactured by Mitsui Chemicals, Cargill and Shimadzu.

<Resin (B)>
The resin (B) used in the present invention is one or more selected from the group consisting of thermoplastic polyester resin, starch, and modified starch.
Examples of the thermoplastic polyester resin include aliphatic polyester resins, aromatic polyesters, polyester resins synthesized from microorganisms or plants, and the like.

  As starch and modified starch, starch obtained from corn, rice, rice bran, potato, wheat, or the like, or starch obtained by copolymerizing natural fats and oils, or starch as a main component, sugars such as lactose, glucose, molasses, Ingested by microorganisms such as casein and modified with a suitable organic substance.

  Specific examples of the resin (B) include commercially available microbial decay resins. For example, polybutylene succinate, polyethylene succinate, polybutylene succinate adipate manufactured by Showa Polymer Co., Ltd. or Nippon Shokubai Co., Ltd., polycaprolactone manufactured by Daicel Chemical Industries, poly (3-hydroxybutyric acid-CO-3- Hydroxyvaleric acid (P (3HB-3HV)) and poly (3-hydroxybutyric acid-CO-4-hydroxybutyric acid) (P (3HB-4HB)) and poly (3-hydroxybutyric acid-CO-3-hydroxypropio) Nate) (P (3HB-3HP)), Upec (polyester polycarbonate) manufactured by Mitsubishi Gas Chemical Company, modified starch resin manufactured by Nippon Corn Pole, and the like.

<Pigment>
In the present invention, the pigment is used without limitation on the type. Specifically, diketopyrrolopyrrole pigments, azo pigments such as azo, disazo, polyazo, phthalocyanine pigments such as copper phthalocyanine, halogenated copper phthalocyanine, and metal-free phthalocyanine, aminoanthraquinone, diaminodianthraquinone, anthrapyrimidine, flavan Anthraquinone pigments such as Throne, Antanthrone, Indanthrone, Pyrantron, and Biolantron, quinacridone pigments, dioxazine pigments, perinone pigments, perylene pigments, thioindigo pigments, isoindoline pigments, isoindolinone pigments, quinophthalone pigments Organic pigments such as pigments, selenium pigments, metal complex pigments, or titanium oxide, zinc white, zinc sulfide, white lead, calcium carbonate, precipitated barium sulfate, white carbon, alumina white, kaolinー, Talc, Bentonite, Black iron oxide, Cadmium red, Bengal, Molybdenum red, Molybdate orange, Chromium vermillion, Yellow lead, Cadmium yellow, Yellow iron oxide, Titanium yellow, Chromium oxide, Viridian, Titanium cobalt green, Cobalt green , Cobalt chrome green, Victoria green, ultramarine, bitumen, cobalt blue, cerulean blue, cobalt silica blue, cobalt zinc silica blue, manganese violet, cobalt violet and other inorganic pigments, or acetylene black, channel black, furnace black and other carbon black Is mentioned.

<Pigment dispersant>
In the present invention, both a fatty acid amide and a fatty acid triglyceride are used as the pigment dispersant.
<Fatty acid amide>
Examples of the fatty acid amide include ethylene bisstearyl amide, ethylene bisbehenic acid amide, ethylene bisoxystearyl amide, stearyl amide, oxystearyl amide, and behenic acid amide. These may be one kind or a mixture of two or more kinds. In particular, ethylene bisstearylamide is preferred.

<Fatty acid triglyceride>
Fatty acid triglycerides are triesters of higher fatty acids and glycerin.
Specific examples of the higher fatty acid include 8 to 31 carbon atoms such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, hydroxystearic acid, 12-hydroxystearic acid, behenic acid, and montanic acid. Saturated fatty acids, undecylenic acid, oleic acid, erucic acid, linoleic acid and other unsaturated fatty acids having 8 to 31 carbon atoms. These may be one kind or a mixture of two or more kinds.

The constituent fatty acid of the fatty acid triglyceride is preferably a saturated fatty acid having 8 to 31 carbon atoms. Fatty acid triglycerides having less than 8 carbon atoms are volatile and may have a poor surface appearance when formed into a resin molded product. In addition, fatty acid triglycerides having more than 31 carbon atoms tend to reduce moldability (fluidity).
Although triglycerides of unsaturated fatty acids can be used, the weather resistance may be impaired, and its use is limited.

<Colored resin composition for microorganism-disintegrating resin>
The colored resin composition for a microorganism-disintegrating resin of the present invention is used as the base resin in the lactic acid resin (A), the resin (B), or a combination of the lactic acid resin (A) and the resin (B). Furthermore, resins other than these resins can be added as necessary.

  From the viewpoint of the productivity of the resin composition, the blending amount of each component in the colored resin composition for a microbial disintegrating resin of the present invention is 50% by weight or more of the base resin, less than 50% by weight of the pigment, and fatty acid amide as the pigment dispersant. Less than 20% by weight and less than 20% by weight fatty acid triglycerides are preferred. Particularly preferred is 0.01 to 10% by weight.

The colored resin composition for a microorganism-disintegrating resin of the present invention is obtained by blending the above base resin, a pigment, and a pigment dispersant and using a kneader such as an extruder, kneader, roll mill, or Banbury mixer.
The fatty acid amide and the fatty acid triglyceride used as a pigment dispersant may be added in advance before the above resin composition is produced, or may be added respectively during the production of the above resin composition. .

  The colored resin composition for a microorganism-disintegrating resin of the present invention may be a so-called master batch that is molded by mixing with a molding resin (diluted resin) during the production of a molded product, or molded with the composition as it is. It may be a compound.

  The shape of the colored resin composition for microbial disintegrating resin is not particularly defined, but when used as a masterbatch, it is preferable from the viewpoint of preventing separation during processing if it is the same as the shape of the diluted resin mixed later.

<Molded product>
When the colored resin composition for microbial disintegration resin of the present invention is a masterbatch, a molded product is obtained by mixing, melt-kneading and molding with a dilute resin when manufacturing a molded product. As the dilution resin, a lactic acid resin (A), a resin (B), a combination of the lactic acid resin (A) and the resin (B), or a combination of one or more of these resins with another resin is used. In the case of a compound, the resin composition is molded as it is.

  The molded product can be molded by a known method such as injection molding, extrusion molding, hollow molding, rotational molding, powder molding, vacuum molding, compression molding and the like similar to general plastics.

  Specific examples of the molded product include mechanical parts, precision parts, electrical / electronic equipment parts, daily goods, industrial parts, fibers, containers, caps, films, tapes, and the like. These may have a laminated structure.

  In the lactic acid resin composition, and a molded product obtained using the same, conventionally known plasticizers, antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, colorants, various fillers, Various additives such as antistatic agents, mold release agents, fragrances, lubricants, flame retardants, foaming agents, fillers, antibacterial / antifungal agents, and other nucleating agents may be blended.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. In the examples, “parts” means “parts by weight” and “%” means “% by weight”.
The composition of the base color is shown in Table 1, and the composition and evaluation results of the colored resin composition for microbial disintegrating resin are shown in Table 2.

<Manufacture of base colors>
[Base color 1]
1% fatty acid amide (Kao Wax EB-P ethylene bis-stearic acid amide), 49% fatty acid triglyceride (K3 wax 500, manufactured by Kawaken Fine Chemicals), copper phthalocyanine green (Lionol Green POG-T, manufactured by Toyo Ink) A base color 1 was obtained by pre-dispersing 50% with a roll mill.

[Base color 2]
Fatty acid amide (Kao's Cao wax EB-P ethylene bis stearic acid amide) 49%, Fatty acid triglyceride (Kawaken Fine Chemical K3 wax 500) 1%, Copper phthalocyanine green (Toyo Ink Manufacturing Lionol Green POG-T) A base color 2 was obtained by pre-dispersing 50% with a roll mill.

[Base color 3]
1% fatty acid amide (Kao Wax EB-P ethylene bis-stearic acid amide), 39% fatty acid triglyceride (K3 Wax 500 made by Kawaken Fine Chemicals), copper phthalocyanine green (Lionol Green POG-T, manufactured by Toyo Ink) A base color 3 was obtained by predispersing 60% with a roll mill.

[Base color 4]
Fatty acid amide (Kao Wax EB-P ethylene bis stearic acid amide) 39%, fatty acid triglyceride (Kawaken Fine Chemical K3 Wax 500) 1%, copper phthalocyanine green (Toyo Ink Manufacturing Lionol Green POG-T) A base color 4 was obtained by predispersing 60% with a roll mill.

[Base color 5]
1% fatty acid amide (Kao Wax EB-P ethylenebisstearic acid amide), 49% fatty acid triglyceride (K3 Wax K3 manufactured by Kawaken Fine Chemicals), 50% copper phthalocyanine blue (Lionol Blue POBS manufactured by Toyo Ink) Were predispersed with a roll mill to obtain a base collar 5.

[Base color 6]
49% fatty acid amide (Kao Wax EB-P ethylene bis-stearic acid amide), 1% fatty acid triglyceride (K3 wax 500, manufactured by Kawaken Fine Chemicals), 50% copper phthalocyanine blue (Lionol Blue POBS, manufactured by Toyo Ink) Were pre-dispersed with a roll mill to obtain a base collar 6.

[Base color 7]
1% fatty acid amide (Kao Wax EB-P ethylenebisstearic acid amide), 49% fatty acid triglyceride (K3 wax 500, manufactured by Kawaken Fine Chemicals), and isoindolinone yellow (Irgazine Yellow 3RLTN, manufactured by Ciba Specialty Chemicals) A base color 7 was obtained by pre-dispersing 50% with a roll mill.

[Base color 8]
Fatty acid amide (Kao Wax EB-P Ethylenebisstearic acid amide) 49%, Fatty acid triglyceride (Kawaken Fine Chemical K3 Wax 500) 1%, Isoindolinone Yellow (Ciba Specialty Chemicals Irgazine Yellow 3RLTN) A base color 8 was obtained by pre-dispersing 50% with a roll mill.

[Base color 9]
A base color 9 is obtained by pre-dispersing 50% of fatty acid amide (Kao wax EB-P ethylenebisstearic acid amide) and isoindolinone yellow (Irgazine Yellow 3RLTN manufactured by Ciba Specialty Chemicals) with a roll mill. It was.

[Base color 10]
A base color 10 was obtained by pre-dispersing 50% of fatty acid triglyceride (K3 wax 500 manufactured by Kawaken Fine Chemical Co., Ltd.) and 50% of isoindolinone yellow (Irgazine Yellow 3RLTN manufactured by Ciba Specialty Chemicals Co., Ltd.) with a roll mill.

<Manufacture of colored resin composition for microorganism-disintegrating resin>
[Example 1]
A base color 11% was kneaded and granulated with an extruder to 99% of a lactic acid resin (Laysia H-100 manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for a microorganism-disintegrating resin.

<Evaluation>
(1) Pigment dispersibility in colored resin composition for microbial disintegrating resin The colored resin composition for microbial disintegrating resin containing 60 g of pigment was passed through a lab plastmill, and the differential pressure before and after passing was read to measure the resin differential pressure. .
Good: differential pressure is less than 5 MPa Bad: differential pressure is 5 MPa or more

[Example 2]
The base color 21% was kneaded and granulated with an extruder with respect to 99% of the lactic acid resin (Laysia H-100 manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for a microorganism-disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Example 3]
A base color 31% was kneaded and granulated with an extruder to 99% of a lactic acid resin (Laysia H-100 manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for a microorganism-disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Example 4]
41% of base color 41 was kneaded and granulated with an extruder against 99% of lactic acid resin (Laysia H-100 manufactured by Mitsui Chemicals) to obtain a colored resin composition for microbial disintegrating resin in the form of pellets. Evaluation was performed in the same manner as in Example 1.

[Example 5]
120% of base color 120 was kneaded and granulated with an extruder against 80% of lactic acid resin (Laisia H-100 manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for microbial disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Example 6]
20% of base color 220 was kneaded and granulated with an extruder against 80% of lactic acid resin (Laisia H-100 manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for microbial disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Example 7]
A base color of 520% was kneaded and granulated with an extruder against 80% of a lactic acid resin (Laisia H-100 manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for a microbial disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Example 8]
A base color of 620% was kneaded and granulated with an extruder against 80% of a lactic acid resin (Laysia H-100 manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for a microbial disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Example 9]
A base color 720% was kneaded and granulated with an extruder against 80% of a lactic acid resin (Laisia H-100 manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for a microorganism-disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Example 10]
A base color 820% was kneaded and granulated with an extruder against 80% of a lactic acid resin (Laisia H-100 manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for a microorganism-disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Example 11]
A base color 120% was kneaded and granulated with an extruder against 80% of an aliphatic polyester resin (Bionore 3001 manufactured by Showa Polymer Co., Ltd.) to obtain a pellet-shaped colored resin composition for a microorganism-disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Example 12]
20% of base color 220 was kneaded and granulated with an extruder against 80% of aliphatic polyester resin (Bionore 3001 manufactured by Showa Polymer Co., Ltd.) to obtain a pellet-shaped colored resin composition for microbial disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Comparative Example 1]
10% isoindolinone yellow (Irgazine Yellow 3RLTN manufactured by Ciba Specialty Chemicals) is blended and granulated in an extruder with 90% lactic acid resin (Laissia H-100 manufactured by Mitsui Chemicals) for pellet-like microbial disintegration resin A colored resin composition was obtained. Evaluation was performed in the same manner as in Example 1.

[Comparative Example 2]
Extruder of 10% isoindolinone yellow (Irgazine Yellow 3RLTN manufactured by Ciba Specialty Chemicals) and 10% zinc stearate (manufactured by Kosho) against 80% lactic acid resin (Laissia H-100 manufactured by Mitsui Chemicals) The mixture was kneaded and granulated to obtain a pellet-shaped colored resin composition for a microbial disintegrating resin. An evaluation test was conducted in the same manner as in Example 1, but the test was stopped because the melt viscosity of the resin was extremely lowered.

[Comparative Example 3]
Extruded 10% isoindolinone yellow (Irgazine Yellow 3RLTN manufactured by Ciba Specialty Chemicals) and 10% polyethylene wax (Sanwa Chemical Sun Wax 131P) against 80% lactic acid resin (Lacia H-100 manufactured by Mitsui Chemicals) The mixture was kneaded and granulated with a machine to obtain a pellet-shaped colored resin composition for microbial disintegrating resin. An evaluation test was conducted in the same manner as in Example 1, but the test was stopped due to separation that occurred due to poor affinity between the wax and the resin during the melt processing.

[Comparative Example 4]
A base color of 920% was kneaded and granulated with an extruder against 80% of a lactic acid resin (Laissia H-100 manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for a microorganism-disintegrating resin. Evaluation was performed in the same manner as in Example 1.

[Comparative Example 5]
A base color 1020% was kneaded and granulated with an extruder against 80% of a lactic acid resin (Laisia H-100, manufactured by Mitsui Chemicals) to obtain a pellet-shaped colored resin composition for a microorganism-disintegrating resin. Evaluation was performed in the same manner as in Example 1.

  Since the colored resin composition for microbial disintegrating resins of the present invention is excellent in pigment dispersibility, a resin molded product having good colorability and surface appearance is obtained. Further, since the pigment can be contained at a high concentration, secondary effects such as reduction in transportation cost of the colored resin composition for microbial disintegrating resins can be expected.

Claims (2)

In a colored resin composition for a microorganism-disintegrating resin comprising a thermoplastic resin, a pigment, and a pigment dispersant, a microorganism disintegration using a lactic acid resin (A) as the thermoplastic resin and a fatty acid amide and a fatty acid triglyceride as the pigment dispersant Colored resin composition for resin. In a colored resin composition for a microorganism-disintegrating resin containing a thermoplastic resin, a pigment, and a pigment dispersant, a resin (B selected from the group consisting of a thermoplastic polyester resin, starch, and modified starch as the thermoplastic resin (B ), A colored resin composition for a microorganism-disintegrating resin using a fatty acid amide and a fatty acid triglyceride as the pigment dispersant.