Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers

Definitions

• the present invention relates to a resin composition, a film formed from the resin composition, and a method for producing the film.
• it has good moldability when manufacturing films such as garbage bags and plastic shopping bags, and has weather resistance that makes it difficult for the film to undergo deterioration such as deformation, discoloration, and deterioration due to heat and light during actual use.
• the resin composition having.
• plastics can suppress the generation of carbon dioxide by implementing the so-called 3Rs (Reuse, Reuse, Recycle), but especially for disposable plastics packaging materials, Recycle (recycle). ) And Reuse (reduction of the amount of plastics used) are also important.
• Patent Document 1 discloses that the manufacturing method has been devised to solve such a problem.
• Patent Document 2 a calcium carbonate-containing dust bag in which the molecular weight distribution of the thermoplastic resin is limited in order to provide appropriate opacity while improving the kneadability at the time of molding so that the thickness of the dust bag becomes uniform.
• a resin composition for use is disclosed (Patent Document 2, paragraph 0009-0010, etc.).
• Patent Document 3 discloses a composition for an inorganic-filled polyethylene film having improved heat-sealing properties by adjusting the MFR (melt flow rate) of polyethylene and adopting heavy calcium carbonate surface-treated with a higher fatty acid. (Patent Document 3, paragraph 0003-0004, etc.).
• the molded film has further reduced weather resistance, so that it is necessary to add an antioxidant or a weather resistant agent. For this reason, when the recycled product is a part or all of the raw material, there is a problem that the product cost increases if the deterioration of the physical properties is prevented.
• the present invention has been made in view of the above circumstances, and has good moldability on a film even in a resin composition containing calcium carbonate and in a resin composition obtained by recycling the resin composition as a raw material.
• Another object of the present invention is to provide a resin composition having weather resistance such that the film is less likely to be deformed, discolored, deteriorated or otherwise deteriorated by heat or light during actual use.
• the resin composition of the present invention comprises a polyolefin, an inorganic compound having a thermal conductivity of 20 W / m ⁇ K or less, and a black pigment having a thermal conductivity of 5 W / m ⁇ K or less.
• the inorganic compound is characterized in that it is 10% by mass or more and 50% by mass or less with respect to the total amount of the resin composition.
• the black pigment is preferably 0.5% by mass or more and 3% by mass or less with respect to the total amount of the resin composition.
• the inorganic compound may contain any one or more of calcium carbonate, titanium dioxide, talc, and silicon dioxide.
• the polyolefin is preferably polyethylene-based.
• the film of the present invention is characterized by being molded by the above resin composition.
• the film may be a garbage bag, a plastic shopping bag, a shopping bag, an agricultural material, an industrial material, or a distribution material.
• the method for producing a film of the present invention comprises a component containing a polyolefin, an inorganic compound having a thermal conductivity of 20 W / m ⁇ K or less, and a black pigment having a thermal conductivity of 5 W / m ⁇ K or less.
• the step of cutting the heat-sealed tubular film or roll-shaped film, the inorganic compound is characterized in that it is 10% by mass or more and 50% by mass or less with respect to the total amount of the resin composition. do.
• the step of molding into the tubular film may be inflation molding. Further, the step of forming the roll-shaped film may be T-die extrusion molding.
• the film of the present invention formed by the resin composition has good moldability, and the film is in actual use. It has weather resistance that does not easily cause deterioration such as deformation, discoloration, and deterioration with respect to heat and light. Further, even when a recycled polyolefin is blended with the resin composition of the present invention, the film formed by the resin composition has good moldability, weather resistance and heat resistance. Therefore, it is not necessary to add additives such as antioxidants and weather resistant agents, and the product cost can be reduced. Further, according to the method for producing a film of the present invention, it is possible to produce a film having good moldability, weather resistance and heat resistance.
• the resin composition of the present invention contains a polyolefin, an inorganic compound, and a black pigment.
• the polyolefin of the present invention is a polymer obtained by polymerizing alkene, which is an unsaturated hydrocarbon having one double bond between CC, as a monomer.
• alkene which is an unsaturated hydrocarbon having one double bond between CC
• polyethylene type there are polyethylene type, polypropylene type and the like, and polyethylene type is preferable.
• Polyethylene type is classified into low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE) and the like according to the density and the degree of linear / branching.
• Low-density polyethylene is polyethylene with a density of 0.910 to 0.930, and ethylene as a monomer is randomly branched and polymerized. Due to its branched structure, it has a low melting point and is soft.
• Linear low density polyethylene is polyethylene having a density of 0.910 to 0.925, and the monomer ethylene is more linear than low density polyethylene (LDPE) and more than high density polyethylene (HDPE). Is branched and polymerized.
• the linear low density polyethylene (LLDPE) has about 10 to 30 short chain branches (SCBs) with respect to the ethylene monomer 1000.
• SCBs short chain branches
• the flexibility and heat resistance of linear low density polyethylene (LLDPE) lies between low density polyethylene (LDPE) and high density polyethylene (HDPE), but the chemical resistance and resistance to stress cracking are low density. Higher than polyethylene (LDPE) and high density polyethylene (HDPE).
• High-density polyethylene is polyethylene having a density of 0.942 or more, and is obtained by linearly polymerizing ethylene as a monomer with almost no branching.
• High-density polyethylene has about 1 to 5 short chain branches (SCBs) with respect to ethylene monomer 1000.
• High-density polyethylene (HDPE) has high crystallinity, rigidity, impact resistance, and cold resistance, and is opaque even when film-molded.
• monomers such as C4, C6 and C8 (butene, hexene, octene and alkenes having a branched structure thereof).
• Polyethylene classified into three types as described above can be blended in a resin composition by mixing two or more types depending on the purpose.
• a recycled product (recycled LL) of linear low-density polyethylene (LLDPE) or a recycled product (recycled HD) of high-density polyethylene (HDPE) can be used as a part or all of the polyolefin raw material.
• Recycled LL is a re-pelletized linear low-density polyethylene film
• recycled HD is a re-pelletized molded high-density polyethylene.
• the inorganic compound of the present invention is blended for the purpose of reducing the amount of plastics used. Further, when the film formed by the resin composition is incinerated in an incinerator, the inorganic compound is blended so that the incinerator does not become too hot and a high maintenance cost is not incurred. It is desirable that the inorganic compound has a small thermal conductivity, more preferably 30 W / m ⁇ K or less, and further preferably 20 W / m ⁇ K or less, and 10 W / m ⁇ K or less.
• the inorganic compound is preferably about 10% by mass or more and 50% by mass or less with respect to the total amount of the resin composition, although it depends on the thermal conductivity of the inorganic compound, 10% by mass or more and 40% by mass or less, and 10% by mass or more and 35. It is more preferably mass% or less.
• the amount of the inorganic compound is less than 10% by mass with respect to the total amount of the resin composition, the effect of reducing the use of plastics is reduced, although it contributes to the improvement of heat resistance.
• the amount of the inorganic compound exceeds 50% by mass with respect to the total amount of the resin composition, heat is easily conducted to the polyolefin, and the film is liable to undergo deterioration such as deformation, discoloration, and deterioration due to the heat and light of the sun during actual use. As a result, weather resistance and heat resistance are reduced.
• the inorganic compound is not particularly limited as long as it is a compound within the above thermal conductivity range, and examples thereof include calcium carbonate, titanium dioxide, talc (Mg 3 Si 4 O 10 (OH) 2 ), silicon dioxide, and zirconium dioxide.
• Inorganic compounds can also be blended in a masterbatch. In this case, the amount of the inorganic compound itself contained in the masterbatch is defined by the above mass%. In addition, the resin contained in the masterbatch is calculated as the blending amount of each type of resin.
• the black pigment of the present invention is a black pigment and is used to color a film formed of a resin composition into black.
• the black pigment one having a thermal conductivity of 5 W / m ⁇ K or less, preferably 3 W / m ⁇ K or less is selected.
• the thermal conductivity of the black pigment exceeds 5 W / m ⁇ K, heat is easily conducted to the polyolefin, and the film is liable to undergo deterioration such as deformation, discoloration, and deterioration due to the heat and light of the sun during actual use.
• the weather resistance is low.
• the black pigment is preferably about 0.5% by mass or more and 3% by mass or less, and 0.8% by mass or more and 2.4% by mass or less, based on the thermal conductivity of the black pigment. Is more preferable.
• the black pigment is less than 0.5% by mass with respect to the total amount of the resin composition, the black pigment is deteriorated, although it contributes to the improvement of heat resistance.
• the black pigment exceeds 3% by mass based on the total amount of the resin composition, heat is easily conducted to the polyolefin, and the film is easily deformed, discolored, deteriorated or deteriorated by the heat and light of the sun during actual use. As a result, weather resistance and heat resistance are reduced.
• the black pigment can also be blended in a masterbatch.
• the amount of the black pigment itself contained in the masterbatch is defined by the above mass%.
• the resin contained in the masterbatch is calculated as the blending amount of each type of resin.
• a masterbatch of a black pigment and a masterbatch of an inorganic compound can be prepared separately and blended with the polyolefin, or one masterbatch containing both the black pigment and the inorganic compound can be prepared and blended with the polyolefin. You can also do it.
• the black pigment is not particularly limited as long as it is a compound that can be colored black within the range of the above thermal conductivity, and examples thereof include carbon black, lamp black, vegetable black, bone black, and graphite.
• the film of the present invention is molded and manufactured from the above resin composition.
• a resin composition is obtained by blending a polyolefin, an inorganic compound having a thermal conductivity of 20 W / m ⁇ K or less, and a black pigment having a thermal conductivity of 5 W / m ⁇ K or less.
• the resin composition is formed into a tube-shaped or roll-shaped film, and the formed film is heat-sealed and cut.
• Inorganic compounds and black pigments can also be blended in a masterbatch.
• An inflation molding method is exemplified as a method for molding into a tubular film.
• the inflation molding method is a method in which a mold having an annular lip is installed at the tip of the extruder, the resin composition is extruded into a tube shape, and compressed air is blown from the center of the mold through an air hole to continuously mold the resin composition.
• a T-die extrusion molding method is exemplified.
• the T-die extrusion molding method is a method in which a T-die (a mold having a linear lip) is installed at the tip of an extruder and a flat resin composition is extruded and molded.
• the use of the film having the constitution of the present invention is not particularly limited, but includes garbage bags, plastic shopping bags, shopping bags, agricultural materials, industrial materials, distribution materials, etc., which are required to have moldability, weather resistance, heat resistance, etc. Illustrated.
• the resin composition of the present invention may or may not contain additives used in ordinary film resins.
• additives used in ordinary film resins include antioxidants and weather resistant agents.
• Example 1- 78% by mass of linear low density polyethylene (LLDPE) (Suitomo Chemical Asia, model number FS153S), 20% by mass of calcium carbonate masterbatch (containing 80% CaCO 3 ) (GCR, model number GRANIC422), black A 2% by mass blend of a pigment masterbatch (containing 40% carbon black and 10% calcium carbonate) (manufactured by DIC Co., Ltd., model number F31470), an inner diameter of 55 mm, and a screw (L / D28) extruder (manufactured by Placo). ) was added, and a tubular film was formed using a die diameter of 100 m ⁇ and a lip of 3 mm at an extrusion temperature of 170 ° C.
• LLDPE linear low density polyethylene
• the tubular film was heat-sealed to a length of 600 mm with a bag making machine (manufactured by Nozaki Kogyo) and cut into a bag shape.
• the temperature of the heat seal was in the range of 160 ° C to 180 ° C.
• the thermal conductivity of calcium carbonate which is an inorganic compound in the film, is 1.0 W / m ⁇ K, the concentration is 16% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K, concentration. Was 0.8% by mass.
• the calcium carbonate masterbatch GRANIC422 contains 80% CaCO 3 and 20% LLDPE using C8 (octene) as a monomer.
• the black pigment masterbatch F31470 contains 40% carbon black, 50% LDPE and 10% calcium carbonate.
• the obtained film was evaluated for (1) film formability, (2) color, (3) film strength, and (4) thermal deterioration.
• the film molded from the resin composition of Example 1 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• Example 2- 78% by mass of high density polyethylene (HDPE) (Saudi Basic Industries Corporation, model number FJ009052), 20% by mass of calcium carbonate masterbatch (80% of Ca 2 CO 3 ) (GCR, model number GRANIC422), A masterbatch of black pigment (containing 40% carbon black and 10% calcium carbonate) (manufactured by DIC Co., Ltd., model number F31470) is blended in an amount of 2% by mass, a tubular film is formed in the same manner as in Example 1, and heat is formed. It was sealed and cut into a bag shape. The obtained film was evaluated in the same manner as in Example 1.
• HDPE high density polyethylene
• FJ009052 20% by mass of calcium carbonate masterbatch
• GCR model number GRANIC422
• a masterbatch of black pigment containing 40% carbon black and 10% calcium carbonate
• the thermal conductivity of calcium carbonate which is an inorganic compound in the film, is 1.0 W / m ⁇ K, the concentration is 16% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K, concentration. Was 0.8% by mass.
• the film molded from the resin composition of Example 2 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• Recycled resins were prepared using films that did not become products in the film manufacturing process and films that were recovered after use in the market.
• the recovered film was separated into HDPE-based and LLDPE-based, the film was crushed by washing or no washing, extruded into strands by an extruder, and cut into pellets.
• an LLDPE-based recycled resin hereinafter referred to as “recycled LL” was used.
• the thermal conductivity of calcium carbonate which is an inorganic compound in the film, is 1.0 W / m ⁇ K, the concentration is 16% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K, concentration. Was 0.8% by mass.
• the film molded from the resin composition of Example 3 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• HDPE-based recycled resin (hereinafter referred to as “recycled HD”) was used in Example 4. 78% by mass of HDPE-based recycled resin (recycled HD), 20% by mass of calcium carbonate masterbatch (containing 80% of Ca 2 CO 3 ) (GCR, model number GRANIC422), black pigment masterbatch (carbon black) (Contains 40% and 10% calcium carbonate) (manufactured by DIC Co., Ltd., model number F31470) is blended in an amount of 2% by mass to form a tubular film in the same manner as in Example 1, heat-sealed, cut and bag-shaped. And said. The obtained film was evaluated in the same manner as in Example 1.
• the thermal conductivity of calcium carbonate which is an inorganic compound in the film, is 1.0 W / m ⁇ K, the concentration is 16% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K, concentration. Was 0.8% by mass.
• the film formed by the resin composition of Example 4 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• LLDPE Linear low density polyethylene
• FS153S LLDPE-based recycled resin
• Ca 2 CO 3 calcium carbonate masterbatch
• GCR model number GRANIC422
• black pigment masterbatch carbon black is 40%, calcium carbonate is contained at 10%
• DI Co., Ltd., model number F31470 is blended by 2% by mass.
• a tubular film was formed in the same manner as in Example 1, heat-sealed, and cut into a bag shape. The obtained film was evaluated in the same manner as in Example 1.
• the thermal conductivity of calcium carbonate which is an inorganic compound in the film, is 1.0 W / m ⁇ K, the concentration is 32% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K, concentration. Was 0.8% by mass.
• the film formed by the resin composition of Example 5 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• High-density polyethylene (HDPE) (manufactured by Saudi Basic Industries Corporation, model number FJ009052) is 26% by mass, HDPE-based recycled resin (recycled HD) is 50% by mass, and titanium dioxide masterbatch (70% of TiO 2 is contained) ( 20% by mass of DIC Co., Ltd., model number L-11167MPT) and 4% by mass of black pigment masterbatch (containing 40% carbon black and 10% calcium carbonate) (DIC Co., Ltd., model number F31470).
• a tubular film was formed in the same manner as in Example 1, heat-sealed, and cut into a bag shape. The obtained film was evaluated in the same manner as in Example 1.
• the titanium dioxide masterbatch L-11167MPT contains 70% titanium dioxide and 30% LLDPE.
• the thermal conductivity of titanium dioxide which is an inorganic compound in the film, is 10 W / m ⁇ K and the concentration is 14% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K and the concentration is 1. It was 0.6% by mass.
• the film formed by the resin composition of Example 6 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• Example 7- 66% by mass of linear low density polyethylene (LLDPE) (manufactured by Sumitomo Chemical Asia, model number FS153S), talc masterbatch (containing 70% of Mg 3 Si 4 O 10 (OH) 2 ) (manufactured by Takehara Chemical Industry Co., Ltd.) , Model No. 1270T) by 30% by mass, and black pigment masterbatch (containing 40% of carbon black and 10% of calcium carbonate) (manufactured by DIC Co., Ltd., model number F31470) by 4% by mass, in the same manner as in Example 1.
• a tube-shaped film was formed, heat-sealed, and cut into a bag shape. The obtained film was evaluated in the same manner as in Example 1.
• the talc masterbatch 1270T contains 70% talc and 30% LLDPE.
• the thermal conductivity of talc which is an inorganic compound in the film, is 0.3 W / m ⁇ K and the concentration is 21% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K and the concentration is It was 1.6% by mass.
• the film formed by the resin composition of Example 7 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• Example 8 50% by mass of the inorganic compound silicon dioxide (manufactured by Nittetsu Chemical & Materials Co., Ltd., model number HS-311) and 50% by mass of polyethylene powder (manufactured by Ube-Maruzen Polyethylene Co., Ltd., model number UM1805) are mixed, and 5 by super mixer. After mixing for a minute, it was extruded into strands by a twin-screw extruder and cut into pellets. This was designated as a silicon dioxide masterbatch.
• HDPE high density polyethylene
• FJ009052 50% by mass of HDPE-based recycled resin
• silicon dioxide masterbatch 50% by weight of silicon dioxide masterbatch (containing 50% SiO 2 ).
• a tube-shaped film was formed by blending 26% by mass and 6% by mass of a black pigment masterbatch (containing 40% carbon black and 10% calcium carbonate) (manufactured by DIC Co., Ltd., model number F31470) in the same manner as in Example 1. It was molded, heat-sealed, and cut into a bag shape. The obtained film was evaluated in the same manner as in Example 1.
• the thermal conductivity of silicon dioxide, which is an inorganic compound in the film, is 1.4 W / m ⁇ K, the concentration is 13% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K, concentration. Was 2.4% by mass.
• the film formed by the resin composition of Example 8 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• Example 9 Among the recycled resins described in Example 3, HDPE-based recycled resin (recycled HD) was used in Example 9. 85% by mass of HDPE-based recycled resin (recycled HD), 13% by mass of calcium carbonate masterbatch (containing 80% of CaCO 3 ) (GCR, model number GRANIC422), black pigment masterbatch (40% of carbon black) (Contains 10% calcium carbonate) (manufactured by DIC Co., Ltd., model number F31470) was blended in an amount of 2% by mass to form a tubular film in the same manner as in Example 1, heat-sealed, and cut into a bag shape. .. The obtained film was evaluated in the same manner as in Example 1.
• the thermal conductivity of calcium carbonate, which is an inorganic compound in the film is 1.0 W / m ⁇ K, the concentration is 10% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K, concentration. Was 0.8% by mass.
• the film formed by the resin composition of Example 9 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• the thermal conductivity of aluminum which is an inorganic compound in the film, is 204 W / m ⁇ K and the concentration is 14% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K and the concentration is 0. It was 8% by mass.
• the film formed by the resin composition of Comparative Example 1 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• HDPE high density polyethylene
• FJ009052 65% by mass of calcium carbonate masterbatch (80% of CaCO 3 )
• GCR model number GRANIC422
• black pigment A masterbatch containing 40% carbon black and 10% calcium carbonate
• the thermal conductivity of calcium carbonate, which is an inorganic compound in the film, is 1.0 W / m ⁇ K, the concentration is 52% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K, concentration. Was 1.6% by mass.
• the film formed by the resin composition of Comparative Example 2 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• LLDPE resin 78% by mass of LLDPE resin (m-LLDPE) synthesized with a metallocene catalyst, 20% by mass of alumina masterbatch (containing 50% of Al 2 O 3 ), black pigment masterbatch (40% of carbon black, calcium carbonate) (Contains 10%) was blended in an amount of 2% by mass, a tubular film was formed in the same manner as in Example 1, heat-sealed, and cut into a bag shape. The obtained film was evaluated in the same manner as in Example 1.
• alumina masterbatch containing 50% of Al 2 O 3
• black pigment masterbatch 40% of carbon black, calcium carbonate
• Alumina which is an inorganic compound in the film, has a thermal conductivity of 36 W / m ⁇ K and a concentration of 10% by mass
• a black pigment carbon black
• the film formed by the resin composition of Comparative Example 3 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• LLDPE Linear low density polyethylene
• GCR model number GRANIC422
• a masterbatch of black pigment containing 40% carbon black and 10% calcium carbonate is blended in an amount of 10% by mass to form a tubular film in the same manner as in Example 1, heat-sealed, and cut into a bag shape. bottom. The obtained film was evaluated in the same manner as in Example 1.
• the thermal conductivity of calcium carbonate which is an inorganic compound in the film, is 1.0 W / m ⁇ K, the concentration is 60% by mass, and the thermal conductivity of the black pigment (carbon black) is 2.2 W / m ⁇ K, concentration. Was 4.0% by mass.
• the film formed by the resin composition of Comparative Example 4 was evaluated as (1) film formability ⁇ , (2) color ⁇ , (3) film strength ⁇ , and (4) thermal deterioration ⁇ .
• a polyolefin an inorganic compound having a thermal conductivity of 10% by mass or more and 50% by mass or less and a thermal conductivity of 20 W / m ⁇ K or less, and a thermal conductivity of 5 W / m ⁇ K or less. It was found that the film formed by the resin composition containing the black pigment has good moldability, is less likely to decrease in strength or deteriorate due to heat, and is environmentally friendly.

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