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  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/05—Alcohols; Metal alcoholates
  • C08K5/053—Polyhydroxylic alcohols
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  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/15—Heterocyclic compounds having oxygen in the ring
  • C08K5/156—Heterocyclic compounds having oxygen in the ring having two oxygen atoms in the ring
  • C08K5/1575—Six-membered rings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/04—Particle-shaped
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
  • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
  • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/92—Measuring, controlling or regulating
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
  • C04B41/4596—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with fibrous materials or whiskers
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
  • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
  • C04B41/48—Macromolecular compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
  • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/10—Esters; Ether-esters
  • C08K5/101—Esters; Ether-esters of monocarboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/54—Silicon-containing compounds
  • C08K5/541—Silicon-containing compounds containing oxygen
  • C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K7/00—Use of ingredients characterised by shape
  • C08K7/02—Fibres or whiskers
  • C08K7/04—Fibres or whiskers inorganic
• • 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
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/10—Homopolymers or copolymers of propene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
  • C08L29/02—Homopolymers or copolymers of unsaturated alcohols
  • C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G23/00—Working measures on existing buildings
  • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
  • E04G23/0296—Repairing or restoring facades
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2948/00—Indexing scheme relating to extrusion moulding
  • B29C2948/92—Measuring, controlling or regulating
  • B29C2948/92009—Measured parameter
  • B29C2948/922—Viscosity; Melt flow index [MFI]; Molecular weight
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2948/00—Indexing scheme relating to extrusion moulding
  • B29C2948/92—Measuring, controlling or regulating
  • B29C2948/92504—Controlled parameter
  • B29C2948/92695—Viscosity; Melt flow index [MFI]; Molecular weight
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2948/00—Indexing scheme relating to extrusion moulding
  • B29C2948/92—Measuring, controlling or regulating
  • B29C2948/92504—Controlled parameter
  • B29C2948/92704—Temperature
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2948/00—Indexing scheme relating to extrusion moulding
  • B29C2948/92—Measuring, controlling or regulating
  • B29C2948/92819—Location or phase of control
  • B29C2948/92857—Extrusion unit
  • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2948/00—Indexing scheme relating to extrusion moulding
  • B29C2948/92—Measuring, controlling or regulating
  • B29C2948/92819—Location or phase of control
  • B29C2948/92857—Extrusion unit
  • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
  • B29C2948/92895—Barrel or housing
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K2201/00—Specific properties of additives
  • C08K2201/002—Physical properties
  • C08K2201/003—Additives being defined by their diameter
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K2201/00—Specific properties of additives
  • C08K2201/002—Physical properties
  • C08K2201/005—Additives being defined by their particle size in general
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/13—Phenols; Phenolates
  • C08K5/134—Phenols containing ester groups

Definitions

• the present invention relates to a transparentization agent composition that can form a polypropylene resin composition that is excellent in transparency, by mixing a dibenzylidene sorbitol transparentization agent having a large particle diameter which has been conventionally considered to be not suitable for adding during processing of a polypropylene resin, with a specific phenol antioxidant in advance, prior to mixing with a resin, and adding the mixture to the resin.
• the present invention also relates to a method for the production of a polypropylene resin composition that is excellent in transparency, which has enabled incorporation of a dibenzylidene sorbitol transparentization agent having a large particle diameter which has been conventionally considered to be not suitable for adding during processing of a polypropylene resin, by selecting a specific condition for processing.
• Polypropylene resins such as propylene homopolymers and ethylene-propylene copolymers are widely used in automobiles, household appliances, construction materials, furniture, packing containers, toys, miscellaneous daily goods and the like.
• polypropylene resins are inferior to polyethylenes, polyethylene telephthalates, polycarbonates, polystyrenes and the like in transparency
• incorporation of various nucleating agents and transparentization agents such as metal salts of benzoic acid, metal salts of aromatic phosphate esters, metal salts of alicyclic compounds, dibenzylidene sorbitols, and amide compounds has been suggested since before and put into practical use.
• dibenzylidene sorbitols are excellent in an effect of improving transparency, but they have defects that they have strong odor, they have a high melting point and thus are difficult to be dispersed homogeneously in resins at a processing temperature, and the like.
• homogeneous dispersion is possible by adjusting the processing temperature to the melting point or more, processing at the melting point or more is not preferable for a compound represented by the general formula (I) which is used in the present invention since it has a high melting point of 260° C. or more and thus processing at the melting point or more causes significant deterioration of polypropylene.
• various treatments such as decreasing of the particle diameter by pulverization and decreasing of the melting point by melt-mixing with other component in advance have been suggested.
• Patent Literature 1 suggests expressing performances by forming a dibenzylidene sorbitol into a powder having d 97 of 30 ⁇ m or less.
• this dibenzylidene sorbitol is excellent in an effect of improving transparency, it has problems that the flowability is decreased by forming into a micropowder, thereby handling properties such as measuring and charging are decreased, and that expected dispersibility cannot be obtained due to blocking, and the like.
• Patent Literature 2 suggests improving performances by using a mixture of dibenzylidene sorbitol compounds having different structures. Since melting point depression occurs by forming a mixture of substances having analogous structures, dispersibility in resins is improved. However, since a transparentization agent having other structure is daringly added to a compound that is specifically excellent in effects among dibenzylidene sorbitols, it is not a sufficient countermeasure due to that the transparentization effect is decreased, and the like.
• Patent Literature 1 JP 06-145431 A
• Patent Literature 2 JP 02-206627 A
• the object of the present invention is to provide a dibenzylidene sorbitol-based transparentization agent that can form a polypropylene resin composition that is excellent in transparency, by incorporating a dibenzylidene sorbitol compound in a polypropylene resin without micropowderization.
• the object of the present invention is to provide a method for the production of a polypropylene resin composition having excellent transparency and physical property despite that the dibenzylidene sorbitol compound has been incorporated in a polypropylene resin without micropowderization.
• a transparentization agent composition which is a mixture containing 100 parts by mass of a dibenzylidene sorbitol compound represented by the following general formula (I) having a particle diameter such that d 97 is from 30 ⁇ m to 200 ⁇ m and 5 to 200 parts by mass of tetrakis[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane, wherein the total for the two components is 50% by mass or more of the mixture.
• a dibenzylidene sorbitol compound represented by the following general formula (I) having a particle diameter such that d 97 is from 30 ⁇ m to 200 ⁇ m and 5 to 200 parts by mass of tetrakis[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane, wherein the total for the two components is 50% by mass or more of the mixture.
• the present invention has achieved the above-mentioned objects by providing a method for producing a polypropylene resin composition, including obtaining a polypropylene resin composition in which a dibenzylidene sorbitol compound represented by the following general formula (I) having a particle diameter such that d 97 is from 30 ⁇ m to 200 ⁇ m is incorporated in a polypropylene resin, by kneading a mixture containing 100 parts by mass of the polypropylene resin and 0.05 to 2 parts by mass of the dibenzylidene sorbitol compound by using a biaxial extruder at an extrusion temperature of from 220 to 250° C.
• a method for producing a polypropylene resin composition including obtaining a polypropylene resin composition in which a dibenzylidene sorbitol compound represented by the following general formula (I) having a particle diameter such that d 97 is from 30 ⁇ m to 200 ⁇ m is incorporated in a polypropylene resin,
• the dibenzylidene sorbitol compound represented by the general formula (I) which is used for the transparentization agent composition of the present invention is not specifically limited by the production method thereof, and any known method may be used.
• the dibenzylidene sorbitol compound represented by the general formula (I) used for the transparentization agent composition of the present invention has a particle diameter such that d 97 is from 30 ⁇ m to 200 ⁇ m, preferably d 97 is from 40 ⁇ m to 150 ⁇ m, specifically preferably d 97 is from 40 ⁇ m to 100 ⁇ m. It is not preferable to pulverize so that d 97 becomes lower than 30 ⁇ m since the cost for pulverization is increased, blocking is generated to decrease handling properties, and dispersibility in a resin is also decreased.
• d 97 in the present invention is a particle diameter at which the percentage of the amount of particles that are smaller than a certain particle diameter with respect to the total amount of the particles is 97.
• the tetrakis[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane used in the transparentization agent composition of the present invention, including the intermediates thereof, can be used without limitation of the production method, crystal form, melting point, infrared ray absorption spectrum, X-ray diffraction peak and the like.
• the transparentization agent composition of the present invention is obtained by mixing 5 to 200 parts by mass, preferably 10 to 150 parts by mass of tetrakis[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane with 100 parts by mass of the dibenzylidene sorbitol compound represented by the general formula (I),
• the mixing conditions such as a mixing apparatus and a temperature are not specifically limited and various mixing apparatuses such as a Henschel mixer can be used. Since it is not specifically necessary to melt, it is preferable to mix at a room temperature without conducting treatments that lead to increase in costs such as heating and cooling. Furthermore, mixing at a room temperature is preferable since coloring during mixing is not concerned.
• the mixing treatment may be conducted under a nitrogen atmosphere so as to suppress coloring due to oxidation during heating and kneading with the resin.
• the total amount of the both components: the dibenzylidene sorbitol compound represented by the general formula (I) and tetrakis[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane is 50% by mass or more, preferably 80% by mass or more, specifically preferably 100% by mass of the mixture.
• Examples of the component other than the above-mentioned both components which may be incorporated in the transparentization agent composition of the present invention may include antioxidants, hindered amine compounds, other nucleating agents and the like.
• the transparentization agent composition of the present invention is effective for improving the transparency of the polypropylene resin
• examples of the polypropylene resin may include a propylene homopolymer, an ethylene-propylene random copolymer, an ethylene-propylene block copolymer, copolymers of propylene and a small amount (1 to 10% by mass) of other ⁇ -olefin (for example, 1-butene, 1-hexene, 4-methyl-1-pentene and the like), a copolymer of propylene and ethylenepropylene (TPO), and the like.
• ⁇ -olefin for example, 1-butene, 1-hexene, 4-methyl-1-pentene and the like
• TPO ethylenepropylene
• polypropylene resins can be used irrespective of the kinds and presence or absence of a polymerization catalyst and a co-catalyst, stereoregularity, average molecular weight, molecular weight distribution, the presence or absence and ratio of a component having a specific molecular weight, specific gravity, viscosity, solubility in various solvents, stretch rate, impact strength, crystallinity, X-ray diffraction, unsaturated carboxylic acids (maleic acid, itaconic acid, fumaric acid and the like) and derivatives thereof (maleic anhydride, maleic acid monoesters, maleic acid diesters and the like) and organic peroxides, irradiation of energy ray, and the presence or absence of modification or a crosslinking treatment by a combination of these treatments, and the like.
• unsaturated carboxylic acids maleic acid, itaconic acid, fumaric acid and the like
• derivatives thereof maleic anhydride, maleic acid monoesters, maleic acid die
• the transparentization agent composition of the present invention is incorporated by preferably 0.01 to 10 parts by mass, more preferably by 0.05 to 5 parts by mass, with respect to 100 parts by mass of the polypropylene resin.
• phenol antioxidants such as phenol antioxidants, phosphorus antioxidants, sulfur antioxidants, ultraviolet absorbers, hindered amine compounds, flame retarders, flame retardant aids, other nucleating agents, antistatic agents, heavy metal inactivators, plasticizers, softeners, lubricants, hydrotalcite compounds, aliphatic acid metal salts, pigments, infrared ray absorbers, antifogging agents, antimist agents, fillers, antibacterial agents and antifungal agents to the polypropylene resin composition containing the transparentization agent composition of the present invention, according to the condition for use and required property.
• general-purpose additives such as phenol antioxidants, phosphorus antioxidants, sulfur antioxidants, ultraviolet absorbers, hindered amine compounds, flame retarders, flame retardant aids, other nucleating agents, antistatic agents, heavy metal inactivators, plasticizers, softeners, lubricants, hydrotalcite compounds, aliphatic acid metal salts, pigments, infrared ray absorbers, antifogg
• phenol antioxidants may include 2,6-di-tert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, 2-methyl-4,6-bis(octylthiomethyl)phenol, distearyl(3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate, 1,6-hexamethylenebis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid amide], 4,4′-thiobis(6-tert-butyl-m-cresol), 2,2′-methylenebis(4-methyl-6-tert-butylphenol), 2,2′-methylenebis(4-ethyl-6-tert-butylphenol), 4,4′-butylidenebis(6-tert-butyl-m-cresol), 2,2′-ethylidenebis(4,6-di-tert-butylphenol), 2,2′-ethylphenol
• Examples of the phosphorus antioxidant may include trisnonyl phenyl phosphite, tris(2,4-di-tert-butylphenyl)phosphite, tris[2-tert-butyl-4-(3-tert-butyl-4-hydroxy-5-methylphenylthio)-5-methylphenyl]phosphite, tridecyl phosphite, octyl diphenyl phosphite, di(decyl)monophenyl phosphite, di(tridecyl)pentaerythritol diphosphite, di(nonylphenyl)pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythri
• sulfur antioxidants may include dilauryl thiodipropionate, dimyristyl thiodipropionate, dipalmityl thiodipropionate, distearyl thiodipropionate, tetrakis(3-laurylthiodipropionate)methane, bis(2-methyl-4-(alkyl (C 8 to C 18 , alone or mixture) thiopropionyloxy)-5-tert-butylphenyl)sulfide, 2-mercaptobenzimidazole and zinc salts thereof, and the like.
• Examples of the ultraviolet absorbers may include 2-hydroxybenzophenones such as 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone and 5,5′-methylenebis(2-hydroxy-4-methoxybenzophenone); 2-(2′-hydroxyphenyl)benzotriazoles such as 2-(2′-hydroxy-5′-methylphenyl)benzotriazole, 2-(2′-hydroxy-3′,5′-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2′-hydroxy-3′-tert-butyl-5′-methylphenyl)-5-chlorobenzotriazole, 2-(2′-hydroxy-5′-tert-octylphenyl)benzotriazole, 2-(2′-hydroxy-3′,5′-dicumylphenyl)benzotriazole, 2,2′-methylenebis(4-tert-octyl-6-benz
• hindered amine compounds may include hindered amine compounds such as 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, 2,2,6,6-tetramethyl-4-piperidyl benzoate, bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate, bis(1-undecyloxy-2,2,6,6-tetramethyl-4-piperidyl)carbonate, tetrakis(2,2,6,6-tetramethyl-4-piperidylbutanetetracarboxylate, tetrakis(1,2,2,6,6-pentamethyl-4-piperidylbutanetetracarboxylate, bis(2,2,6,6-tetramethyl-4-piperidyl)-di(tridecyl)-1,2,3,4-
• halogen flame retarders such as decabromodiphenyl ether and tetrabromobisphenol A, condensed phosphoric acid esters of a polyvalent phenol such as triphenyl phosphate, resorcinol and bisphenol A and a monovalent phenol such as 2,6-xylenol; inorganic phosphorus compounds such as red phosphorus and melamine phosphate; nitrogen-containing flame retarders such as melamine cyanurate; inorganic flame retarders such as magnesium hydroxide and aluminum hydroxide; flame retardant aids such as antimony oxide and zirconium oxide; antidrip agents such as polytetrafluoroethylene, and the like are used.
• halogen flame retarders such as decabromodiphenyl ether and tetrabromobisphenol A, condensed phosphoric acid esters of a polyvalent phenol such as triphenyl phosphate, resorcinol and bisphenol A and a monovalent phenol such
• the flame retardant aid may include fluorine resins such as polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polytetrafluoroethylene-hexafluoropropylene copolymer (FEP) and (meth)acrylic-modified PTFE, silicone resins and the like.
• fluorine resins such as polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polytetrafluoroethylene-hexafluoropropylene copolymer (FEP) and (meth)acrylic-modified PTFE, silicone resins and the like.
• the other nucleating agents may include metal salts of benzoic acids such as sodium benzoate, aluminum-p-tert-butyl benzoate and lithium-p-tert-butyl benzoate; phosphoric acid ester metal salts such as sodium 2,2-methylenebis(4,6-di-tert-butylphenyl)phosphoric acid ester; other benzylidene sorbitols such as dibenzylidene sorbitol, bis(4-methylbenzylidene)sorbitol and bis(4-ethylbenzylidene)sorbitol; metal alcoholates such as zinc glycerin; amino acid metal salts such as zinc glutamate; aliphatic dibasic acids having a bicyclo structure and metal salts thereof such as bicycloheptane dicarboxylic acid or salts thereof, aromatic sulfonic acid metal salts such as sodium benzenesulfonate and lithium p-toluenesulfon
• the dibenzylidene sorbitol compound of the general formula (I) that is specifically excellent in transparency is used without micropulverization, a similar effect to that of a micropulverized article can be obtained, and combination use of other dibenzylidene sorbitol decreases the effect of the present invention since the effect of improving transparency is decreased as compared to the addition amount.
• a metal salt compound such as a phosphoric acid ester metal salt such as sodium 2,2-methylenebis(4,6-di-tert-butylphenyl)phosphoric acid ester
• heavy metal inactivators may include 2-hydroxybenzamide-N-1H-1,2,4-triazol-3-yl and dodecanedioic acid bis[2-(2-hydroxybenzoyl)hydrazide].
• hydrotalcite compound a double salt compound containing magnesium and aluminum or double salt compound containing magnesium, zinc and aluminum represented by the following formula (II) is preferably used, or the double salt compound may be dehydrated to remove crystalline water.
• x1, x2 and yl each represents a number that satisfies the condition represented by the following formula, and m represents 0 or an optional integer:
• the above-mentioned hydrotalcite compound may be a natural substance or a synthesized product.
• known synthesis methods described in Japanese Patent Application Publication (JP-B) Nos. 46-2280, 50-30039, 51-29129, 3-36839, JP-A Nos. 61-174270, 2001-164042, 2002-53722 and the like can be exemplified.
• the above-mentioned hydrotalcite compound can be used in the present invention without limitation by its crystalline structure, crystalline particle diameter and the like, and it is preferable that the residual amount of a heavy metal component such as iron included in the raw material is small such that the cost for purification is in a practical range.
• hydrotalcite compound those coating the surface thereof with a higher aliphatic acid such as stearic acid, a higher aliphatic acid metal salt such as an alkali metal oleate, an organic sulfonic acid metal salt such as an alkali metal salt of dodecylbenzenesulfonic acid, a higher aliphatic acid amide, a higher aliphatic acid ester or a wax, or the like can also be used.
• a higher aliphatic acid such as stearic acid
• a higher aliphatic acid metal salt such as an alkali metal oleate
• an organic sulfonic acid metal salt such as an alkali metal salt of dodecylbenzenesulfonic acid
• a higher aliphatic acid amide such as a higher aliphatic acid amide
• a higher aliphatic acid ester or a wax or the like
• the method for incorporating the transparentization agent composition of the present invention in the polypropylene resin and the method for molding, use and the like of the resin composition after the incorporation are not specifically limited.
• the resin composition is molded into a film, a sheet, a molded product or the like by using a known molding and processing technique such as extrusion molding, injection molding, blow, calendar, press molding and vacuum molding, and is used for interior and exterior materials for automobiles, household appliance products, construction materials, packaging materials, agriculture materials, miscellaneous goods, medical instruments and the like.
• the resin composition can be used alone, or after adhering to other resin, metal or the like directly or through an adhesive layer.
• Examples of the polypropylene resin that is used for the method for producing the polypropylene resin composition of the present invention may include a propylene homopolymer, an ethylene-propylene random copolymer, an ethylene-propylene block copolymer, copolymers of propylene and a small amount (1 to 10% by mass) of other ⁇ -olefin (for example, 1-butene, 1-hexene, 4-methyl-1-pentene and the like), a copolymer of propylene and ethylenepropylene (TPO) and the like.
• ⁇ -olefin for example, 1-butene, 1-hexene, 4-methyl-1-pentene and the like
• TPO ethylenepropylene
• polypropylene resins can be used irrespective of the kinds and presence or absence of a polymerization catalyst and a co-catalyst, stereoregularity, average molecular weight, molecular weight distribution, the presence or absence and ratio of a component having a specific molecular weight, specific gravity, viscosity, solubility in various solvents, stretch rate, impact strength, crystallinity, X-ray diffraction, unsaturated carboxylic acids (maleic acid, itaconic acid, fumaric acid and the like) and derivatives thereof (maleic anhydride, maleic acid monoesters, maleic acid diesters and the like) and organic peroxides, irradiation of energy ray, and the presence or absence of modification or a crosslinking treatment by a combination of these treatments, and the like.
• unsaturated carboxylic acids maleic acid, itaconic acid, fumaric acid and the like
• derivatives thereof maleic anhydride, maleic acid monoesters, maleic acid die
• the dibenzylidene sorbitol compound represented by the general formula (I) which is used for the method for producing the polypropylene resin compound of the present invention is not specifically limited by the production method thereof, and any known method may be used.
• the dibenzylidene sorbitol compound represented by the general formula (I) used for the production method of the present invention has a particle diameter such that d 97 is from 30 ⁇ m to 200 ⁇ m, specifically preferably d 97 is from 40 ⁇ m to 150 ⁇ m. It is not preferable to pulverize so that d 97 becomes lower than 30 ⁇ m since the cost for pulverization is increased, blocking is generated to decrease handling properties.
• d 97 is larger than 200 ⁇ m, there are problems that the transparency is insufficient, fish eyes are increased in the case when the resin is formed into a film or the like, and the like.
• d 97 in the present invention is a particle diameter at which the percentage of the amount of particles that are smaller than a certain particle diameter with respect to the total amount of the particles is 97.
• the incorporation amount of the above-mentioned dibenzylidene sorbitol compound represented by the general formula (I) is 0.05 to 2 parts by mass, preferably 0.1 to 1 part by mass with respect to 100 parts by mass of the above-mentioned polypropylene resin.
• the incorporation amount of the dibenzylidene sorbitol compound is lower than 0.05 part by mass, the effect of addition is insufficient, and even if it is added by exceeding 2 parts by mass, no improvement of the effect is observed.
• the biaxial extruder for kneading the mixture obtained by incorporating the above-mentioned dibenzylidene sorbitol compound represented by the general formula (I) in the above-mentioned polypropylene resin a biaxial extruder having at least three temperature-controlled areas from a resin injection part to dies is preferable, and for example, a biaxial extruder PCM-30 (trade name) manufactured by Ikegai Corporation, a biaxial extruder TEX-28V (trade name) manufactured by Japan Steel Works, Ltd. or the like can be preferably used.
• the kneading of the mixture by the above-mentioned biaxial extruder is conducted at an extrusion temperature of 220 to 250° C., preferably 230 to 250° C.
• the temperature of the biaxial extruder may be set so that the temperatures of the parts other than the resin injection part and other than the dies are each set to 220 to 250° C. in the areas from the resin injection part to the dies in the biaxial extruder.
• dibenzylidene sorbitol compound represented by the general formula (I) in the above-mentioned polypropylene resin, it is preferable to incorporate the dibenzylidene sorbitol compound and tetrakis[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane in the form of a mixture, or to incorporate those compounds separately at the same time.
• tetrakis[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane is incorporated, it is preferably incorporated by 5 to 200 parts by mass, specifically by 10 to 150 parts by mass with respect to 100 parts by mass of the above-mentioned dibenzylidene sorbitol compound.
• general-purpose additives such as phenol antioxidants, phosphorus antioxidants, sulfur antioxidants, ultraviolet absorbers, hindered amine compounds, flame retarders, flame retardant aids, other nucleating agents, antistatic agents, heavy metal inactivators, plasticizers, softeners, lubricants, hydrotalcite compounds, aliphatic acid metal salts, pigments, infrared ray absorbers, antifogging agents, antimist agents, fillers, antibacterial agents and antifungal agents to the mixture in which the above-mentioned dibenzylidene sorbitol compound represented by the general formula (I) is incorporated in the above-mentioned polypropylene resin, according to the condition for use and required property.
• these resin additives those mentioned above can be used.
• the method for molding, use and the like of the polypropylene resin composition according to the present invention are not specifically limited.
• the composition is molded into a film, a sheet, a molded product or the like by using a known molding and processing technique such as extrusion molding, injection molding, blow, calendar, press molding and vacuum molding, and is used for interior and exterior materials for automobiles, household appliance products, construction materials, packaging materials, agriculture materials, miscellaneous goods, medical instruments and the like.
• the composition can be used alone, or after adhering to other resin, metal or the like directly or through an adhesive layer.
• each dibenzylidene sorbitol powder (it is abbreviated as Sorbitol in Table 1 and Table 2) having d97 described in Table 1 and Table 2.
• the d 97 of the dibenzylidene sorbitol powder was measured by laser light scattering.
• blocking property was evaluated for the obtained dibenzylidene sorbitol powders by measuring angles of repose by a powder tester. The angles of repose of the respective dibenzylidene sorbitol powders are shown in Table 1 and Table 2. A larger angle of repose represents poorer flowability.
• Each transparentization agent composition was prepared by mixing each of the dibenzylidene sorbitol powders obtained in Synthesis Example (these are abbreviated as Sorbitols in Table 1) and a powder of tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane (this is abbreviated as Phenol in Table 1: ADEKA STAB AO-60 manufactured by ADEKA Corporation was used) by the composition described in Table 1.
• the melt flow index (MFI) at 230° C. under a load of 2.16 kg of the obtained pellets was measured according to JIS K 7210 by using a melt indexer (manufactured by Toyo Seiki Seisaku-Sho, Ltd.) to evaluate the presence or absence of decrease in the physical properties of the resin. A larger MFI is not preferable since the physical properties of the resin are changed more significantly.
• the haze of the test piece was measured according to JIS K 7361-1 to evaluate the effect of improving transparency. A smaller value of haze is preferable since transparency is more excellent.
• the polypropylene resins of Examples 1 to 5 to which the transparentization agent composition of the present invention has been incorporated are excellent in transparency and the physical properties have not been decreased.
• the polypropylene resin of Comparative Example 1 to which a transparentization agent composition using a dibenzylidene sorbitol powder having a particle diameter so that d 97 is smaller is incorporated is excellent in transparency but the physical properties have been decreased.
• the polypropylene resin of Comparative Example 2 to which a transparentization agent composition composed of a dibenzylidene sorbitol powder alone has been added has poor transparency and significantly decreased physical properties.
• the melt flow index (MFI) at 230° C. under a load of 2.16 kg of the obtained pellets was measured according to JIS K 7210 by using a melt indexer (manufactured by Toyo Seiki Seisaku-Sho, Ltd.) to evaluate the presence or absence of decrease in the physical properties of the resin. A larger MFI is not preferable since the physical properties of the resin are changed more significantly.
• the haze of the test piece was measured according to JIS K 7361-1 to evaluate the effect of improving transparency. A smaller value of haze is preferable since transparency is more excellent.
• the transparentization agent composition of the present invention can provide a transparentization agent composition by which a polypropylene resin composition that is excellent in transparency can be molded without micropulverization of a dibenzylidene sorbitol compound, by preparing a mixture of a dibenzylidene sorbitol compound having a large particle diameter by which sufficient transparency could not be obtained in the past, with a specific phenol antioxidant, and adding the mixture to a polypropylene resin.
• the method for the production of the polypropylene resin composition of the present invention can give a polypropylene resin composition having excellent transparency and physical properties despite the fact that a dibenzylidene sorbitol compound has been incorporated in the polypropylene resin without micropowderization.

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