JP2002226644A - Polypropylene-based resin composition for sanitary ware and molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polypropylene-based resin composition for sanitary ware of which the molded article does not discolor by urine nor scorch during molding and a molded article for sanitary ware using the resin composition and a method of molding the article. SOLUTION: This polypropylene-based resin composition for sanitary ware comprizes (A) 100 pts.wt. of a polypropylene-based resin blended with (B) 0.01-1 pt.wt. of a hydroxylamine compound represented by general formula (1) (wherein, R1 and R2 are each a 12-30C alkyl) and (C) 0.05-1 pt.wt. of a light stabilizer of a hindered amine type. A molded article for sanitary ware using the resin composition and a method of molding the article are also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polypropylene resin composition for sanitary ware, a molded article for sanitary ware obtained by using the resin composition, and a method of molding the molded article. More specifically, there is no discoloration of the molded article due to urine, the polypropylene resin composition for sanitary appliances which is less likely to burn during processing, a molded article for sanitary appliances obtained using the resin composition, and a method for molding the molded article It is about.

[0002]

2. Description of the Related Art Polypropylene resins have excellent mechanical properties and chemical resistance.
It is used for sanitary appliances such as toilet lids. Sanitary fittings include:
Usually, to prevent aging due to thermal oxidation deterioration during molding, heat during use, oxygen and light, various stabilizers, for example, phenolic compounds, phosphorus compounds, sulfur compounds,
A polypropylene-based resin composition containing a hindered amine-based light stabilizer, an ultraviolet absorber, an antibacterial agent, and a pigment for improving the appearance of the product is used.

However, if time passes while human urine adheres to a sanitary appliance (for example, a toilet seat) obtained using a polypropylene resin composition, even if the urine is wiped off, the portion to which the urine adheres becomes red or gray. It does not fade even if it is wiped off with a cleaning chemical. Since discoloration due to urine is one of the causes of discomfort to the user and lowering the commercial value, it has been studied to prevent discoloration due to urine, and polypropylene is excellent in preventing discoloration due to urine. Based resin compositions have been found.

[0004] For example, Japanese Patent Application Laid-Open No. 10-287778 discloses a urinary stool containing a highly crystalline polypropylene resin, a hindered amine stabilizer and an aromatic phosphorus antioxidant.
Disclosed is a polypropylene resin composition for toilet bowl parts, which sufficiently suppresses discoloration due to detergents and the like, is excellent in texture and feel, has good rigidity, good heat aging resistance, and has good detergent resistance.

[0005] Japanese Patent Application Laid-Open No. 2000-1580 discloses a polypropylene resin containing a polypropylene resin, a white pigment, a hindered amine compound, and a polypropylene resin.
The content of the phenolic antioxidant is 0.1 part by weight.
A urine discoloration-resistant resin composition which is not more than 02 parts by weight and is excellent in urine discoloration resistance, heat resistance and weather resistance and suitable for materials such as toilet seat sheets and toilet lids is described.

[0006] However, a polypropylene resin composition for toilet parts containing an aromatic phosphorus antioxidant described in JP-A-10-287778 or JP-A-2000-287778 is disclosed.
The urine discoloration-resistant resin composition described in Patent No. 1580, in which the content of the phenolic compound is as small as possible, causes the resin to be blackened by burning during molding, causing black spots on the molded body and impairing the appearance of the product. Further, discoloration due to urine may be further improved.

Further, US Pat. No. 4,590,231 (corresponding Japanese Patent Publication No. JP-A-60-101132) discloses a saturated polyolefin, a phenolic antioxidant, and a sterically hindered amine light stabilizer. A stabilizer selected from the group consisting of UV absorbers, UV absorbers, organophosphorus compounds, metal salts of fatty acids and thiosynergists and hydroxylamine derivatives, stabilized against degradation, exposed to heat or natural gas combustion products. Alternatively, polyolefin compositions which are stabilized against discoloration due to prolonged storage at ambient temperature are described.

However, when the polyolefin composition described in US Pat. No. 4,590,231 (corresponding Japanese Patent Publication No. JP-A-60-101132) is used for sanitary ware, burning during molding is performed. Further improvement has been desired in order to prevent discoloration due to urine.

[0009]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a polypropylene resin composition for sanitary ware, which is free from discoloration of the molded article due to urine and has little burning during processing, and a sanitary product obtained by using the resin composition. An object of the present invention is to provide a molded article for a device and a method for molding the molded article.

[0010]

SUMMARY OF THE INVENTION A polypropylene resin composition for a sanitary appliance, comprising a polypropylene resin and a specific amount of a specific hydroxylamine compound and a specific amount of a hindered amine light stabilizer in a specified range. The present inventors have found that a molded article for sanitary ware obtained by using the resin composition and a method of molding the molded article can solve the above-mentioned problems, and have completed the present invention.

That is, according to the present invention, 100 parts by weight of a polypropylene resin (A) is added to the following general formula (I): (Wherein, R ¹ and R ² represent an alkyl group having 12 to 30 carbon atoms.) 0.01 to 1 part by weight of a hydroxylamine-based compound (B) represented by the formula (I) and a hindered amine-based light stabilizer (C ) The present invention relates to a polypropylene resin composition for sanitary ware, wherein 0.05 to 1 part by weight is blended. The present invention also relates to a molded article for sanitary appliances obtained by using the above-mentioned polypropylene-based resin composition for sanitary appliances, and a method for molding the molded body.
Hereinafter, the present invention will be described in detail.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION As the polypropylene resin (A) used in the present invention, crystalline propylene homopolymer, propylene-ethylene random copolymer, propylene-α-olefin random copolymer, propylene-ethylene- α-olefin copolymer, a propylene homopolymer component or a copolymer component mainly composed of propylene,
A polypropylene-based copolymer composed of a copolymer component of propylene, ethylene and / or an α-olefin is exemplified. These polypropylene resins may be used alone or as a blend of two or more.

The α-olefin is not particularly limited, but is preferably an α-olefin having 4 to 12 carbon atoms, for example, 1-butene, 1-pentene, 1-hexene, 4-methyl-1- Examples thereof include pentene, 1-octene, 1-decene, and more preferably 1-butene and 1-butene.
Hexene, 1-octene.

Examples of the propylene-α-olefin random copolymer include a propylene-1-butene random copolymer, a propylene-1-hexene random copolymer, and a propylene-1-octene random copolymer. .

As the propylene-ethylene-α-olefin copolymer, for example, propylene-ethylene-1-
Butene copolymer, propylene-ethylene-1-hexene copolymer, propylene-ethylene-1-octene copolymer and the like.

A propylene homopolymer component or a copolymer component mainly composed of propylene and a copolymer mainly composed of propylene in a polypropylene copolymer composed of a copolymer component of propylene and ethylene and / or an α-olefin. Examples of the component include a propylene-ethylene copolymer component, a propylene-1-butene copolymer component, a propylene-1-hexene copolymer component, and the like, and a copolymer of propylene with ethylene and / or an α-olefin. Examples of the coalescing component include a propylene-ethylene copolymer component, a propylene-ethylene-1-butene copolymer component, a propylene-ethylene-1-hexene copolymer component, and a propylene-ethylene-1-octene copolymer component. Propylene-1-butene copolymer component, propylene-1-hexene Copolymer component, propylene-1-
Octene copolymer components and the like.

The content of ethylene and / or α-olefin in the copolymer component of propylene and ethylene and / or α-olefin is not particularly limited, but is usually 0.01 to 20% by weight.

Examples of a propylene homopolymer component or a copolymer component mainly composed of propylene and a polypropylene copolymer composed of a copolymer component of propylene with ethylene and / or an α-olefin include, for example,
(Propylene)-(propylene-ethylene) copolymer,
(Propylene)-(propylene-ethylene-1-butene) copolymer, (propylene)-(propylene-ethylene-1-hexene) copolymer, (propylene)-(propylene-1-butene) copolymer, (Propylene)-(propylene-1-hexene) copolymer, (propylene-ethylene)-(propylene-ethylene) copolymer, (propylene-ethylene)-(propylene-ethylene-1-butene) copolymer, (propylene -Ethylene)-(propylene-ethylene-1-hexene) copolymer, (propylene-ethylene)-(propylene-1-butene) copolymer, (propylene-ethylene)-(propylene-1-hexene) copolymer , (Propylene-1-butene)-(propylene-ethylene) copolymer, (propylene-1-butene)-(propylene (Ethylene-1-butene) copolymer, (propylene-1-butene)-(propylene-ethylene-1-hexene) copolymer, (propylene-1-butene)-(propylene-1-butene) copolymer, (Propylene-1-butene)-(propylene-1-hexene)
And copolymers.

The polypropylene resin (A) used in the present invention is preferably a crystalline propylene homopolymer, a propylene homopolymer component or a copolymer component mainly composed of propylene, propylene and ethylene and / or
Or, it is a polypropylene copolymer comprising a copolymer component of α-olefin. More preferably, it is a polypropylene copolymer comprising a propylene homopolymer component or a copolymer component mainly comprising propylene and a copolymer component of propylene and ethylene and / or an α-olefin.

The crystallinity of the polypropylene resin (A) used in the present invention is not particularly limited, but those having high crystallinity are preferred from the viewpoint of rigidity and scratch resistance. As a polypropylene resin having high crystallinity, A.I. Methods published by Zambelli et al. (Macromolecules Vol. 6, 92
5, pp. 1973), and the pentad unit in the polypropylene molecule is 5 propylene monomer units.
The fraction of propylene monomer units at the center of a chain of meso-bonds that are consecutively connected (referred to as pentad fraction, [mmm
m]. ) Is preferably 0.95 or more.

The method for producing the polypropylene resin (A) used in the present invention is not particularly limited, and it can be produced by a known polymerization method using a known polymerization catalyst. As the polymerization catalyst, for example, a Ziegler-type catalyst, a Ziegler-Natta type catalyst, a catalyst system comprising a transition metal compound of Group IV of the periodic table having a cyclopentadienyl ring and an alkylaluminoxane, or a period having a cyclopentadienyl ring Examples of the catalyst include a transition metal compound of Table IV group, a compound which reacts therewith to form an ionic complex, and an organoaluminum compound.

Examples of the polymerization method include a slurry polymerization method using an inert hydrocarbon solvent, a solvent polymerization method, a liquid phase polymerization method using no solvent, a gas phase polymerization method, and a liquid phase-gas method in which these are continuously performed. A phase polymerization method and the like are mentioned, and these polymerization methods may be a batch type or a continuous type. Further, a method of producing the polypropylene-based resin (A) in one step or a method of producing the polypropylene resin (A) in two or more steps may be employed. In particular, as a method for producing a propylene homopolymer component or a copolymer component mainly composed of propylene, and a polypropylene-based copolymer composed of a copolymer component of propylene and ethylene and / or an α-olefin, propylene homopolymer is preferable. A multi-step production method of at least two or more steps comprising a step of producing a polymer component or a copolymer component mainly composed of propylene and a step of producing a copolymer component of propylene and ethylene and / or an α-olefin. Can be

In the production of the polypropylene resin (A) used in the present invention, it is necessary to remove residual solvents contained in the polypropylene resin (A) and ultra-low molecular weight oligomers by-produced during the production. If necessary, the polypropylene resin (A) may be dried at a temperature lower than the temperature at which the resin (A) melts. As the drying method, for example, JP-A-55-75410,
For example, the method described in JP-A-5657553 can be used.

The melt index of the polypropylene resin (A) used in the present invention is not particularly limited.
From the viewpoint of moldability, usually 0.01 to 200 g / 1.
0 minutes, preferably 1 to 100 g / 10 minutes,
More preferably, it is 10 to 50 g / 10 minutes.

The hydroxylamine compound (B) used in the present invention is represented by the following general formula (I): (Wherein, R ¹ and R ² each represent an alkyl group having 12 to 30 carbon atoms).

The hydroxylamine compound represented by the general formula (I) is a compound which forms a nitroxyl radical in the course of a degradation reaction of a polymer material due to heat and oxygen, thereby suppressing thermal oxidation degradation of the polymer material. It is.

In the hydroxylamine compound (B) represented by the general formula (I), R ¹ and R ^{2 each} have 12 to 30 carbon atoms.
Wherein R ¹ and R ² may be the same or different. The alkyl group is preferably an alkyl group substituted by a linear alkyl group or a cyclic alkyl group, and preferably has 12 to 22 carbon atoms.
R ¹ and R ² are more preferably 12 to 2 carbon atoms.
2 straight-chain saturated alkyl groups.

As the linear saturated alkyl group, for example,
Straight-chain saturated alkyl groups such as tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, eicosyl group, heneicosyl group, docosyl group, tricosyl group and tetracosyl group, and preferably tetradecyl Group, hexadecyl group, octadecyl group, eicosyl group, docosyl group.

The amount of the hydroxylamine-based compound (B) used in the present invention is determined according to the amount of the polypropylene-based resin (A).
The amount is 0.01 to 1 part by weight, preferably 0.05 to 0.5 part by weight, and more preferably 0.1 to 0.3 part by weight based on 100 parts by weight. When the amount of the hydroxylamine-based compound (B) is less than 0.01 part by weight, the processing stability may be insufficient. When the amount exceeds 1 part by weight,
The appearance of the molded product, such as hue and gloss, may be insufficient.

The hindered amine light stabilizer (C) used in the present invention is a hindered amine compound or a compound having a hindered amine skeleton in a molecule.
An amine compound or skeleton (structure) having a hindered (sterically hindered) substituent near a nitrogen atom.

The hindered amine light stabilizer (C) used in the present invention is preferably a hindered amine light stabilizer having a molecular weight of 2,000 or more, from the viewpoints of urinary discoloration resistance and prevention of burning during processing, and more preferably. Is a hindered amine light stabilizer having a 2,2,6,6-tetramethylpiperidine skeleton represented by the following general formula (II) in the molecule. (Formula 2) (In the formula, R ³ represents a hydrogen atom, an oxyl group, an alkyl group, or an acyl group. The 4-position indicates that it can be bonded to any atom or group.)

As the hindered amine light stabilizer (C) used in the present invention, for example, dimethyl succinate and 4
-Hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol polycondensate (molecular weight; 3100-4
000), poly [{6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-
Diyl {(2,2,6,6-tetramethyl-4-piperidyl) imino} hexamethylene} (2,2,6,6-
Tetramethyl-4-piperidyl) imino}] (molecular weight;
2000-3100), dibutylamine-1,3,5-
Triazine N, N'-bis (2,2,6,6-tetramethyl-4-piperidyl-1,6-hexamethylenediamine and N- (2,2,6,6-tetramethyl-4-piperidyl) Butylamine polycondensate (molecular weight: 2600 to 2600)
3400), N, N ′, N ″, N ′ ″-tetrakis- (4,6bis- (butyl- (N-methyl-2,2,2
6,6-tetramethylpiperidin-4-yl) amino)
-Triazin-2-yl) -4,7-diazadecane-
1,10-diamine (molecular weight; 2286), mixed {1,2,2,6,6-pentamethyl-4-piperidyl / β, β, β ′, β′-tetramethyl-3,9- [2,
4,8,10-Tetraoxaspiro (5,5) undecane] dimethyl} -1,2,3,4 butanetetracarboxylate (molecular weight: about 2000) and the like and mixtures thereof. These compounds may be used alone or in combination of two or more.

As the hindered amine light stabilizer (C), dimethyl succinate and 4-hydroxy-
Polymer of 2,2,6,6-tetramethyl-1-piperidineethanol (molecular weight; 3100 to 4000), N,
N ', N ", N'"-tetrakis- (4,6bis-
(Butyl- (N-methyl-2,2,6,6-tetramethylpiperidin-4-yl) amino) -triazine-2-
Yl) -4,7-diazadecane-1,10-diamine (molecular weight: 2286), dibutylamine · 1,3,5-
Triazine N, N'-bis (2,2,6,6-tetramethyl-4-piperidyl-1,6-hexamethylenediamine and N- (2,2,6,6-tetramethyl-4-piperidyl) Butylamine polycondensate (molecular weight: 2600 to 2600)
3400), poly [{6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4
-Diyl {(2,2,6,6-tetramethyl-4-piperidyl) imino} hexamethylene} (2,2,6,6
-Tetramethyl-4-piperidyl) imino}] (molecular weight: 2000 to 3100).

More preferably, the hindered amine light stabilizer (C) is a polymer of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol (molecular weight: 3100 to 4000). ,
N, N ', N ", N"'-tetrakis- (4,6bis- (butyl- (N-methyl-2,2,6,6-tetramethylpiperidin-4-yl) amino) -triazine −
2-yl) -4,7-diazadecane-1,10-diamine (molecular weight: 2286).

The amount of the hindered amine light stabilizer (C) used in the present invention is determined by the amount of the polypropylene resin (A).
It is 0.05 to 1 part by weight, preferably 0.05 to 0.5 part by weight, and more preferably 0.05 to 0.3 part by weight with respect to 100 parts by weight. When the amount of the hindered amine light stabilizer (C) is less than 0.05 part by weight, the light stability and the heat stability may be insufficient.
If the amount exceeds the weight part, the hue of the molded product may be insufficient.

If necessary, other additives may be added to the polypropylene resin composition for sanitary ware of the present invention as long as the objects and effects of the present invention are not impaired. As other additives, for example, a neutralizing agent, a sulfur-based stabilizer, an ultraviolet absorber, a metal deactivator, a flame retardant, a foaming agent, an antistatic agent,
Examples thereof include a lubricant, a nucleating agent, a filler, and a pigment. These additives are not particularly limited, and known additives can be used. Among them, a neutralizing agent, an ultraviolet absorber, an antistatic agent, a lubricant, a nucleating agent, a filler, and a pigment are usually used.

Examples of the neutralizing agent include hydrotalcite, metal salts of higher fatty acids, and alkaline earth metal hydroxide compounds. As the ultraviolet absorber, for example,
Acrylic UV absorbers, oxamide UV absorbers, salicylate UV absorbers, 2-hydroxybenzophenone UV absorbers, 2- (2'-hydroxyphenyl) benzotriazole UV absorbers, benzoate UV absorbers, etc. No. These ultraviolet absorbers may be used alone or in combination of two or more.

The antistatic agent is preferably a surfactant, for example, a nonionic surfactant, an anionic surfactant, a cationic surfactant and an amphoteric surfactant, and more preferably glycerin fatty acid. Esters, N, N'-bis (2-hydroxyethyl) aliphatic amines, N, N'-bis (2-hydroxyisopropyl) aliphatic amines, N, N'-bis (2-hydroxyethyl) fatty Family amides and nonionic surfactants.

Examples of the lubricant include fatty amide compounds, polyolefin wax compounds and the like. Examples of the nucleating agent include metal phosphates, metal benzoates, sorbitol nucleating agents and mixtures thereof, rosin alkali metal salts or alkaline earth metal salts, and polymer nucleating agents. No.

As the filler, for example, calcium carbonate, silica, glass fiber, talc, kaolin, mica,
Examples include barium sulfate, carbon black, carbon fiber, zeolite, and mixtures thereof.

Examples of the pigment include titanium oxide, carbon black, iron oxide, zinc oxide, zinc sulfide, red iron oxide, and other organic pigments. These pigments are generally used in a mixture with polyethylene wax, polypropylene wax, fatty acid metal salt and the like.

Further, various antibacterial agents may be added to the polypropylene resin composition for sanitary ware of the present invention, if necessary, as long as the objects and effects of the present invention are not impaired. Examples of the antibacterial agent include an organic antibacterial agent and an inorganic antibacterial agent.

As the organic antibacterial agent, for example, 10,1
Phenyl ether derivatives such as 0'-oxybisphenoxaarsine, N-haloalkylthio compounds such as cyclofluanid, imidazole derivatives such as 2- (4-thiazonyl) benzimidazole, 2,3,5,6-detracolor- Sulfone derivatives such as 4- (methylsulfonyl) pyridine; and quaternary ammonium salts such as cetyldimethylethylammonium bromide.

Examples of the inorganic antibacterial agent include silver nitrate,
Antibacterial agents in which silver-based compounds such as silver sulfate and silver chloride, and substances that generate metal ions such as copper, silver, zinc, and tin are supported on carriers such as ceramics, zeolites, and silica. An antibacterial agent that generates a substituted metal ion is exemplified.

The polypropylene resin composition for sanitary ware of the present invention may contain, if necessary, a resin other than the polypropylene resin (A) used in the present invention as long as the object and effects of the present invention are not impaired. Can also be blended. Examples include high-density polyethylene, linear low-density polyethylene which is a copolymer of ethylene and an α-olefin, low-density polyethylene produced by a high-pressure radical polymerization method, petroleum resin, elastomer, and the like. Examples of the elastomer include a styrene-butadiene-styrene copolymer and a styrene-based copolymer rubber obtained by hydrogenating a styrene-isoprene-styrene copolymer.

The production of the polypropylene resin composition for sanitary ware of the present invention is not particularly limited, and can be carried out by a known melt-kneading method. For example, there is a method in which a polypropylene resin (A), a hydroxylamine compound (B) and a hindered amine light stabilizer (C) are blended and pelletized using a melt extruder, a Banbury mixer, or the like. In addition, melt kneading, if necessary,
It may be carried out in the presence or absence of an inert gas such as nitrogen, in order to adjust the melt index of the polypropylene resin composition for sanitary ware of the present invention, melt kneading in the presence of an organic peroxide. You may.

As for the other additives to be added as required, a predetermined amount of additives may be directly added to the polypropylene resin (A), or a high-concentration additive may be added to the polypropylene resin (A) in advance. It is also possible to prepare a masterbatch in which the additives are blended and blend them during melt-kneading or molding to adjust the blending amount of the additives.

The polypropylene resin composition for sanitary ware of the present invention can be used for a sanitary ware molded article since the molded article is not discolored by urine. Examples of the molded article for sanitary appliances include a toilet bowl, a toilet seat, a toilet lid, a toilet tank, a hot water flush toilet seat material, and a toilet paper case.

Examples of the molded article for sanitary ware of the present invention include an integral molded article and a multilayer molded article, and are preferably multilayer molded articles, and more preferably the outermost layer of the multilayer molded article is the sanitary ware of the present invention. It is a multilayer molded article which is the outermost layer obtained by using the polypropylene resin composition for a product.

The layers other than the outermost layer in the multilayer molded article are not particularly limited, but can be melt-bonded to the material constituting the outermost layer, and are the polypropylene resin composition for sanitary ware of the present invention. Or other resin. As other resins, for example, olefin-based thermoplastic resin, or a thermoplastic resin composition and the like,
Preferred are a polypropylene resin, a polyethylene resin, and a filler-reinforced composite polypropylene resin. As the layer other than the outermost layer, preferably other resin, as the multilayer molded body, the outermost layer obtained by using the polypropylene resin composition for sanitary ware of the present invention, the layer other than the outermost layer is A multilayer molded body having a multilayer structure composed of layers obtained by using other resins is preferable.

The method for producing the molded article for sanitary ware of the present invention is not particularly limited, and generally includes industrially used molding methods such as injection molding and press molding. Method, vacuum molding method, foam molding method and the like.

Examples of the method for producing an integrally molded article or a multilayer molded article include an integral molding method and a multilayer molding method using injection molding, press molding, vacuum molding, foam molding and the like. Examples of the multilayer molding method include a multilayer extrusion molding method, a multicolor injection molding method, and a sandwich molding method.

[0053]

The present invention will be described in more detail with reference to the following examples and comparative examples, but the present invention is not limited to these examples. The physical property values of each item of the examples and comparative examples were measured by the following methods. (1) Melt index (MI, unit: g / 10 min) Measured at 230 ° C according to JIS K7210. (2) Stereoregularity ([mmmm]) Using ¹³ C-nuclear magnetic resonance spectroscopy, Zamb
elli et al. (Macromol
ecules, Vol. 6, p. 925, 1973), isotactic pentad fraction ([mmm
m]). For the measurement, a 200 mg sample was dissolved in 3 ml of a mixed solvent of orthodichlorobenzene / heavy orthodichlorobenzene (orthodichlorobenzene / heavy orthodichlorobenzene = 4/1 (volume ratio)), and JNM-EX270 manufactured by JEOL Ltd. was dissolved. It was performed using.

(3) Content of Ethylene-Propylene Random Copolymer Component and Ethylene Content (Unit:% by Weight) Measured by ¹³ C-nuclear magnetic resonance spectroscopy. For the measurement, a 200 mg sample was dissolved in 3 ml of a mixed solvent of orthodichlorobenzene / heavy orthodichlorobenzene (orthodichlorobenzene / heavy orthodichlorobenzene = 4/1 (volume ratio)), and JNM-EX270 manufactured by JEOL Ltd. was dissolved. It was performed using. (4) Melting point (unit: ° C) Differential scanning calorimeter (DSC-VII manufactured by PerkinElmer)
Using a mold, 10 mg of the sample was previously melted at 220 ° C. for 5 minutes in a nitrogen atmosphere, then cooled to 50 ° C. at a rate of 5 ° C./min to crystallize, and then at a rate of 5 ° C./min. And the temperature was measured. The maximum peak temperature of the obtained melting endothermic curve was defined as the melting point.

(5) Urine Discoloration Test (5-1) Preparation of Test Piece (Molded Body) Using an injection molding machine, a sheet having a thickness of 3 mm was prepared at a cylinder temperature of 200 ° C. and a mold temperature of 50 ° C. Produced. (5-2) Discoloration test of urine Human urine was dropped on the surface of the sheet having a thickness of 3 mm produced by the method of the above (5-2), and left at room temperature for 3 weeks. Thereafter, the residual urine component adhering to the sheet surface was wiped off with a cloth, washed and removed with water, and the discolored state of the sheet surface where urine was dropped was visually observed and determined. The criterion is ×
(With discoloration) and （(without discoloration).

(6) Burn Test 30 g of the pellets were placed in a glass container and subjected to a heating test in a gear oven set at 200 ° C. The observation time of occurrence of burning was visually observed every 4, 24, 48, 72 (hours). The evaluation criteria were ○ (no burn), Δ (slight burn), and × (extreme burn).

The following polypropylene resins and additives were used in Examples and Comparative Examples. (A) Polypropylene resin (a-1): PP-1 crystalline propylene-ethylene block copolymer (content of ethylene-propylene random copolymer component: 11% by weight, in ethylene-propylene random copolymer component Ethylene content: 54.4% by weight, melting point: 161.3
° C, stereoregularity ([mmmm]): 0.953, MI:
(A-2): PP-2 crystalline homopolypropylene (melting point: 162.2 ° C., stereoregularity ([mmmm]): 0.956, MI: 25 g /
10 minutes)

(B) Stabilizer (b-1) Calcium stearate (calcium stearate S: manufactured by NOF Corporation) (b-2) Hydroxylamine compound: N, N-dioctadecylhydroxylamine (CAS)
No. 143925-92-2) (Irgastab
FS042: Ciba Specialty Chemicals Co., Ltd. (Structure) is represented by the formula (Formula 3). (3)

(B-3): AO-1 3,9-bis [2- {3- (3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxy}-
1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane (Sumilyzer GA
80: manufactured by Sumitomo Chemical Co., Ltd.) (b-4): AO-2 pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (IRGANOX1010: Ciba Specialty Chemicals) (B-5): AO-3 Tris (2,4-di-tert-butylphenyl) phosphite (IRGAFOS168: manufactured by Ciba Specialty Chemicals) (b-6): AO-4 bis (2 4-Di-t-butylphenyl) pentaerythritol diphosphite (ADEKA STAB PEP-24)
G: Asahi Denka Kogyo Co., Ltd.)

(C) Light stabilizer (c-1): HA-1 dimethyl succinate and 4-hydroxy-2,2,6,6-
A polycondensate of tetramethyl-1-piperidineethanol,
Molecular weight: 3100 to 4000 (TINVIN622L
D: Ciba Specialty Chemicals (manufactured by) (c-2): HA-2 dibutylamine 1,3,5-triazine.N, N'-
Bis (2,2,6,6-tetramethyl-4-piperidyl-1,6-hexamethylenediamine and N- (2,2,2
Polycondensate of 6,6-tetramethyl-4-piperidyl) butylamine, molecular weight: 2600 to 3400 (CHIM
ASSORB2020FDL: Ciba Specialty Chemicals (manufactured by) (c-3): HA-3 poly [@ 6- (1,1,3,3-tetramethylbutyl)
Amino-1,3,5-triazine-2,4-diyl
｛(2,2,6,6-tetramethyl-4-piperidyl)
Imino {hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl) imino}], molecular weight: 2000
~ 3100, (CHIMASSORB 944LD: Ciba Specialty Chemicals Co., Ltd.)

(D) Pigment Ivory color (titanium component, red iron oxide, carbon black,
Contains fatty acid metal salt)

Example 1 To 80 parts by weight of polypropylene powder (PP-1) and 20 parts by weight of polypropylene powder (PP-2), 0.05 part by weight of calcium stearate N, N-
0.1 parts by weight of dioctadecyl hydroxylamine,
0.05 parts by weight of (HA-1) and 2.6 parts by weight of an ivory pigment were added and mixed in advance with a Henschel mixer. The blended components are shown in Table 1. The mixture was subjected to a 40 mm diameter single screw extruder (manufactured by Tanabe Seisakusho Co., Ltd.)
The mixture was heated and melt-kneaded at a set temperature of 200 ° C. and a screw rotation speed of 100 rpm to form pellets. The pellets were subjected to a burning test. Further, a urine discoloration test was performed using a test piece obtained by injection molding of the pellet. The results are shown in Table 2.

Example 2 The procedure of Example 1 was repeated, except that the light stabilizer (HA-1) was changed to the light stabilizer (HA-2). The results are shown in Tables 1 and 2.

Example 3 In Example 1, the light stabilizer (HA-1) was replaced with (HA-
Except having changed to 3), it carried out similarly to Example 1. The results are shown in Tables 1 and 2.

Comparative Examples 1 to 5 The same procedures as in Example 1 were carried out except that N, N-dioctadecylhydroxylamine was changed to the stabilizers shown in Table 1. The results are shown in Tables 1 and 2.

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[Table 1] Common component Polypropylene resin: PP-1 (80 parts by weight) and P
P-2 (20 parts by weight) Calcium stearate (Ca (St) ₂ , 0.05 parts by weight) Ivory pigment (2.6 parts by weight)

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[Table 2]

Examples 1 to 3 satisfying the requirements of the present invention include:
It can be seen that there is no discoloration of the molded body due to urine and there is little burning during processing. On the other hand, Comparative Example 1
Comparative Examples 4 and 5 are those using a phenolic compound which is not a requirement of the present invention, so that the molded article is discolored by urine and easily burns during processing.
Indicates that an aromatic phosphorus-based compound, which is not a requirement of the present invention, is used, so that burning during processing is likely to occur.

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As described above, according to the present invention, a polypropylene-based resin composition for sanitary ware, which does not cause discoloration of the molded article due to urine and is less likely to burn during processing, can be obtained by using the resin composition. A molded article for sanitary appliances can be obtained.

Continued on the front page F term (reference) 2D037 AA13 4F071 AA20 AC12 AE05 AH03 BB06 BC07 4J002 BB121 BB151 BP021 EN106 EU077 FD010 FD047 FD050 FD100 FD170 FD180 GL00 GT00

Claims (10)

[Claims] 1. A method according to claim 1, wherein 100 parts by weight of the polypropylene resin (A) is represented by the following general formula (I): (Wherein, R ¹ and R ² represent an alkyl group having 12 to 30 carbon atoms.) 0.01 to 1 part by weight of a hydroxylamine-based compound (B) represented by the formula (I) and a hindered amine-based light stabilizer (C ) A polypropylene-based resin composition for sanitary ware, which comprises 0.05 to 1 part by weight. 2. The hydroxylamine compound (B) represented by the general formula (I) wherein R ¹ and R ^{2 each} have 12 to 22 carbon atoms.
The polypropylene resin composition for sanitary ware according to claim 1, which is a linear alkyl group represented by the formula: 3. The polypropylene resin composition for sanitary ware according to claim 1, wherein the molecular weight of the hindered amine light stabilizer (C) is 2,000 or more. 4. A hindered amine light stabilizer (C) comprising a polymer of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol, dibutylamine-1,3,5 -Triazine-N, N'-bis (2,2,6,6-tetramethyl-4-piperidyl-
1,6-hexamethylenediamine and N- (2,2,6,
Polycondensate of 6-tetramethyl-4-piperidyl) butylamine, poly [{6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl} (2,2,6,6-tetramethyl-4-piperidyl) imino {hexamethylene} (2,2,6,6-tetramethyl-4-piperidyl) imino} The polypropylene resin composition for sanitary ware according to claim 3, characterized in that: 5. A molded article for sanitary appliances obtained by using the polypropylene resin composition for sanitary appliances according to any one of claims 1 to 4. 6. The molded article for sanitary ware according to claim 5 is a multilayer molded article, the outermost layer of which is obtained by using the polypropylene resin composition for sanitary ware according to any one of claims 1 to 4. A molded article for a sanitary appliance characterized by being manufactured. 7. A multilayer molding method for a molded article for sanitary ware according to claim 6. 8. The molded article for sanitary ware according to claim 5, wherein the molded article for sanitary ware is a toilet article. 9. A toilet article according to claim 8, wherein the toilet article is a toilet seat. 10. A toilet article according to claim 8, wherein the toilet article is a toilet lid.