JP2002053713A - Polypropylene resin composition for sanitary wake and molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polypropylene resin composition for sanitary implements which can give a molded product free from coloring caused by urine and is excellent in working stability; a molded product for sanitary implements made with the resin composition; and a method for molding to give the molded product. SOLUTION: The polypropylene resin composition for sanitary implements is prepared by mixing 100 parts by weight of a polypropylene resin (A), 0.03-1.0 parts by weight of a phenol compound (B) represented by general formula (I) (wherein either of Y and Z shows a hydroxyl group, and another does hydrogen or a C1-8 alkyl group) and 0.01-1.0 parts by weight of a hindered amine light stabilizer (C). The molded product for sanitary implements can be made with the resin composition by a method for molding to give the product.

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, heat stability, light stability,
Scratch resistance, rigidity is maintained without lowering, there is no discoloration of the molded article due to urine, and a polypropylene resin composition for sanitary appliances excellent in processing stability, a molded article for sanitary appliances containing the resin composition, and a molded article for sanitary appliances containing the resin composition The present invention relates to a method for molding a molded article.

[0002]

2. Description of the Related Art In recent years, as a material for molded articles for sanitary appliances,
Highly crystalline polypropylene resin is used. For example, Japanese Patent Application Laid-Open No. 7-184806 describes a toilet seat and a toilet lid made of a highly crystalline polypropylene composition comprising a highly crystalline polypropylene and a nucleating agent.

[0003] As a polypropylene resin composition for sanitary appliances, a polypropylene resin is subjected to thermal oxidative deterioration during molding, aging due to heat, oxygen and light during use, and the like.
To prevent discoloration and the like due to urine, stabilize the quality for a long time, in order to maintain, is used by adding various stabilizers, for example, phenolic compounds, phosphorus compounds,
Sulfur compounds, hindered amine light stabilizers, ultraviolet absorbers and the like are used. Furthermore, antibacterial agents and pigments are added to improve the appearance of the product, and the quality is stabilized. In particular, regarding discoloration due to urine, if human urine is attached to a polypropylene resin toilet seat or the like, and time elapses,
Even if the urine is wiped off, the area to which the urine adheres turns red or gray, etc., and does not fade even when wiped with a cleaning chemical, etc., causing user disgust and reducing the commercial value of polypropylene resin toilet seats etc. It has become one of. Therefore, in order to prevent discoloration due to urine, a polypropylene-based resin composition that does not contain a phenolic compound or has a small content is used.

For example, Japanese Patent Application Laid-Open No. 10-287778 discloses a polypropylene resin for toilet bowl parts containing a highly crystalline polypropylene resin, a hindered amine stabilizer and an aromatic phosphorus antioxidant, and not containing a phenol compound. A composition is described.

Japanese Patent Application Laid-Open No. 2000-1580 discloses a urine-resistant discoloration containing a polypropylene resin, a white pigment, a hindered amine compound and a phenolic antioxidant content of 0.02 parts by weight or less. A hydrophilic resin composition is described.

However, a resin composition containing no phenolic compound or containing a small amount of phenolic compound is desired to have improved processing stability in which thermal oxidation deterioration or the like during molding is prevented. It can be obtained by using a polypropylene resin composition for sanitary ware and its resin composition that satisfies physical properties such as processing stability and urine discoloration resistance, heat stability, light stability, scratch resistance, and rigidity. A molded article for sanitary appliances has been desired.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to maintain heat stability, light stability, scratch resistance, and rigidity without lowering, to prevent the molded product from being discolored by urine, and to have excellent processing stability. An object of the present invention is to provide a polypropylene resin composition for sanitary appliances, a molded article for sanitary appliances obtained by using the resin composition, and a method for molding the molded article.

[0008]

Means for Solving the Problems The inventors of the present invention have made intensive studies in view of the above situation, and as a result, have found that a polypropylene resin for a sanitary appliance comprising a specific phenolic compound and a specific hindered amine light stabilizer mixed with a polypropylene resin. The present inventors have found that a resin composition, a molded article for sanitary ware obtained by using the composition, and a multilayer molding method of the molded article can solve the above-mentioned problems, and have completed the present invention.

That is, according to the present invention, the following general formula (I) is added to 100 parts by weight of the polypropylene resin (A). (Wherein R ¹ , R ² , R ⁴ and R ⁵ each independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms,
Represents an alkylcycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group, and R ³ represents a hydrogen atom or 1 carbon atom.
To 8 alkyl groups. X is a mere bond, a sulfur atom or a —CHR ⁶ — group (R ⁶ is a hydrogen atom,
8 represents an alkyl group or a cycloalkyl group having 5 to 8 carbon atoms. ). A represents an alkylene group having 2 to 8 carbon atoms or a * -COR ⁷ -group (R ⁷ represents a mere bond or an alkylene group having 1 to 8 carbon atoms, and * indicates that it is bonded to the oxygen side. ). One of Y and Z represents a hydroxyl group, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Hindered amine light stabilizer (C) having 0.03 to 1.0 part by weight of phenolic compound (B) represented by formula (1) and a molecular weight of 2,000 or more.
The present invention relates to a polypropylene-based resin composition for sanitary appliances, which comprises from 0.01 to 1.0 part by weight. 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.

[0010]

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, such as 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 propylene-1-butene random copolymer, propylene-1-hexene random copolymer, propylene-1-octene random copolymer and the like. .

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

A copolymer mainly composed of propylene in a propylene homopolymer component or a copolymer component mainly composed of propylene and 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. In the copolymer component of propylene and ethylene and / or α-olefin, ethylene and / or C 4 to C 1 may be used.
The content of α-olefin No. 2 is not particularly limited, but is usually 0.01 to 20% by weight.

Examples of the 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 an α-olefin having 4 to 12 carbon atoms. More preferably, a propylene homopolymer component or a copolymer component mainly composed of propylene and a polypropylene copolymer composed of a copolymer component of propylene and ethylene and / or an α-olefin having 4 to 12 carbon atoms. is there.

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. The method published by Zambelli et al. (Macromolecules 6, 925, 1).
973), the fraction of propylene monomer units at the center of a chain in which five propylene monomer units are consecutively meso-bonded in pentad units in the polypropylene molecule (referred to as pendat fraction and expressed in [mmmm]). Those having 0.95 or more are preferable.

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. Examples of the polymerization catalyst include 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 cyclic system having a cyclopentadienyl ring. Examples thereof include a catalyst system comprising a transition metal compound of Table IV and a compound which reacts therewith to form an ionic complex, and an organoaluminum compound.

As the polymerization method, for example, 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, or a liquid phase-gas method where 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, a method for producing 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 having 4 to 12 carbon atoms. Preferably, a step of producing a propylene homopolymer 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 having 4 to 12 carbon atoms. At least two or more stages.

Further, in the production of the polypropylene resin (A) used in the present invention, in order 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 phenolic compound (B) used in the present invention is represented by the following general formula (I) (Wherein R ¹ , R ² , R ⁴ and R ⁵ each independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms,
Represents an alkylcycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group, and R ³ represents a hydrogen atom or 1 carbon atom.
To 8 alkyl groups. X is a mere bond, a sulfur atom or a —CHR ⁶ — group (R ⁶ is a hydrogen atom,
8 represents an alkyl group or a cycloalkyl group having 5 to 8 carbon atoms. ). A represents an alkylene group having 2 to 8 carbon atoms or a * -COR ⁷ -group (R ⁷ represents a mere bond or an alkylene group having 1 to 8 carbon atoms, and * indicates that it is bonded to the oxygen side. ). One of Y and Z represents a hydroxyl group, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. ).

In the phenolic compound (B) represented by the general formula (I), the substituents R ¹ , R ² , R ⁴ and R ⁵ each independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms,
Cycloalkyl group having 5 to 8 carbon atoms, 6 to 6 carbon atoms
12 alkylcycloalkyl groups, having 7 to 12 carbon atoms
Represents an aralkyl group or a phenyl group.

Here, representative examples of the alkyl group having 1 to 8 carbon atoms include, for example, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec- A butyl group, a t-butyl group, a t-pentyl group, an i-octyl group, a t-octyl group, a 2-ethylhexyl group and the like are exemplified. As a typical example of a cycloalkyl group having 5 to 8 carbon atoms, for example, cyclopentyl Group, cyclohexyl group, cycloheptyl group, cyclooctyl group and the like. Representative examples of the alkylcycloalkyl group having 6 to 12 carbon atoms include 1-methylcyclopentyl group, 1-methylcyclohexyl group, 1-methyl -4
-I-propylcyclohexyl group and the like. Representative examples of the aralkyl group having 7 to 12 carbon atoms include a benzyl group, an α-methylbenzyl group and an α, α-dimethylbenzyl group.

R ¹ , R ² and R ⁴ are preferably an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, and an alkylcycloalkyl group having 6 to 12 carbon atoms. Among them, R ¹ and R ⁴ are more preferably a t-alkyl group such as a t-butyl group, a t-pentyl group, a t-octyl group, a cyclohexyl group, and a 1-methylcyclohexyl group.

R ² is more preferably methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, t-butyl,
An alkyl group having 1 to 5 carbon atoms such as a t-pentyl group, and more preferably a methyl group, a t-butyl group, and a t-pentyl group.

R ⁵ is preferably a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms, more preferably a hydrogen atom, a methyl group,
Alkyl groups having 1 to 5 carbon atoms such as ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group and t-pentyl group. .

The substituent R ³ is a hydrogen atom or a group having 1 carbon atom.
Represents an alkyl group having 1 to 8 carbon atoms, and examples of the alkyl group having 1 to 8 carbon atoms include the same alkyl groups as described above. It is preferably a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and more preferably a hydrogen atom or a methyl group.

The substituent X may be a mere bond, a sulfur atom or an alkyl group having 1 to 8 carbon atoms or 5 carbon atoms.
Represents a methylene group which may be substituted with a cycloalkyl group of ~ 8. Here, examples of the alkyl group having 1 to 8 carbon atoms and the cycloalkyl group having 5 to 8 carbon atoms which are substituted on the methylene group include the same alkyl groups and cycloalkyl groups as described above. As the substituent X,
Preferably, it is a methylene group substituted by a mere bond, a methylene group or a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a t-butyl group or the like.

The substituent A is an alkylene group having 2 to 8 carbon atoms or a * -COR ⁷ -group (R ⁷ is a mere bond or an alkylene group having 1 to 8 carbon atoms, and * is a bond on the oxygen side. Is shown.)

Here, representative examples of the alkylene group having 2 to 8 carbon atoms include, for example, ethylene group, propylene group,
Examples thereof include a butylene group, a pentamethylene group, a hexamethylene group, an octamethylene group, a 2,2-dimethyl-1,3-propylene group, and a propylene group is preferable. * In the * -COR ⁷ -group indicates that the carbonyl group is bonded to the oxygen atom of the phosphite group. R ⁷
Examples of the alkylene group having 1 to 8 carbon atoms include a methylene group, an ethylene group, a propylene group, a butylene group, a pentamethylene group, a hexamethylene group, an octamethylene group, a 2,2-dimethyl-1, 3-propylene group and the like. R ⁷ is preferably a mere bond or an ethylene group.

One of the substituents Y and Z represents a hydroxyl group, and the other represents a hydrogen atom or a group having 1 to carbon atoms.
8 represents an alkyl group. Here, examples of the alkyl group having 1 to 8 carbon atoms include the same alkyl groups as described above.

The amount of the phenolic compound (B) used in the present invention is 100 parts by weight of the polypropylene resin (A).
0.03 to 1.0 part by weight with respect to parts by weight. Preferably 0.03-0.5 parts by weight, more preferably,
It is 0.05 to 0.3 parts by weight. If the phenolic compound (B) is less than 0.03 parts by weight, the processing stability may be insufficient. If it exceeds 1.0 part by weight, the appearance of the molded product such as hue and gloss may be poor. May be enough.

The hindered amine light stabilizer (C) used in the present invention is a hindered amine light stabilizer having a molecular weight of 2,000 or more. If the molecular weight is 2000 or more, a known hindered amine-based light stabilizer can be used. Preferably, it is a hindered amine light stabilizer having a 2,2,6,6-tetramethylpiperidine skeleton represented by the following general formula (II) in the molecule. It is a compound that has the role of capturing the radicals generated by the above and preventing the organic and polymer materials from deteriorating due to the decomposition of the hydroperoxide. (In the formula, R ⁸ represents a hydrogen atom, an oxyl group, an alkyl group, or an acyl group.)

The hindered amine light stabilizer (C) used in the present invention includes, 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 to 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-
Polycondensate of piperidyl) butylamine (molecular weight: 260
0-3400), N, N ′, N ″, N ′ ″-tetrakis- (4,6bis- (butyl- (N-methyl-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, etc. and mixtures thereof, and two or more of these compounds may be used.

Preferred hindered amine light stabilizers (C) include dimethyl succinate and 4-hydroxy-
Polycondensate of 2,2,6,6-tetramethyl-1-piperidineethanol (molecular weight: 3100 to 4000), 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
３3100).

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 0.01 to 1.0 part by weight based on 100 parts by weight. Preferably it is 0.03-0.5 weight part, More preferably, it is 0.05-0.3 weight part. When the amount of the hindered amine light stabilizer (C) is less than 0.01 part by weight, the light stability and heat stability may be insufficient. Hue of the body and discoloration resistance to urine may be insufficient.

The polypropylene resin composition for sanitary appliances of the present invention is preferably a polypropylene resin for sanitary appliances comprising at least one selected from the group consisting of an ultraviolet absorber, an antistatic agent and a nucleating agent. A composition.

The ultraviolet absorber used in the present invention is not particularly limited, and a known one can be used. For example, acrylate UV absorbers, oxamide UV absorbers, salicylate UV absorbers, 2-hydroxybenzophenone UV absorbers, 2- (2'-
(Hydroxyphenyl) benzotriazole-based UV absorbers and the like, and two or more of these UV absorbers may be used.

Examples of the acrylate UV absorber include ethyl α-cyano-β, β-diphenyl acrylate, isooctyl α-cyano-β, β-diphenyl acrylate, methyl α-carbomethoxycinnamate, and methyl α-cyano- β-methyl-p-methoxycinnamate, butyl α-cyano-β-methyl-p-
Methoxycinnamate, methyl α-carbomethoxy-
p-methoxycinnamate and N- (β-carbomethoxy-β-cyanovinyl) -2-methylindoline and mixtures thereof and the like.

As the oxamide-based ultraviolet absorber, for example, 4,4′-dioctyloxyoxanilide, 2,2
2'-diethoxyoxanilide, 2,2'-dioctyloxy-5,5'-di-t-butylanilide, 2,2 '
-Didodecyloxy-5,5'-di-t-butylanilide, 2-ethoxy-2'-ethyloxanilide, N,
N'-bis (3-dimethylaminopropyl) oxamide, 2-ethoxy-5-t-butyl-2'-ethoxyanilide, 2-ethoxy-5,4'-di-t-butyl-
2'-ethyl oxanilide and mixtures thereof, and the like.

Examples of the salicylate-based ultraviolet absorber include phenyl salicylate, 4-t-butylphenyl salicylate, 4-t-octylphenyl salicylate, and 2,4-di-t-butylphenyl 3 ′, 5′-di-
t-butyl-4'-hydroxybenzoate, bis (4
-T-butylbenzoyl) resorcinol, benzoylresorcinol, hesisadecyl 3 ', 5'-di-t-butyl-4'-hydroxybenzoate, octadecyl 3', 5'-di-t-butyl-4'-hydroxybenzoate, 2 -Methyl-4,6-di-t-butylphenyl 3 ', 5'-di-t-butyl-4'-hydroxybenzoate and mixtures thereof.

Examples of the 2-hydroxybenzophenone type ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone,
2,2'-dihydroxy-4-methoxybenzophenone, bis (5-benzoyl-4-hydroxy-2-methoxyphenyl) methane, 2,2 ', 4,4'-tetrahydroxybenzophenone, and mixtures thereof, and the like. .

Examples of the 2- (2'-hydroxyphenyl) benzotriazole-based ultraviolet absorber include, for example, 2-
(2-hydroxy-5-methylphenyl) benzotriazole, 2- (3 ′, 5′-di-t-butyl-2′-hydroxyphenyl) benzotriazole, 2- (5′-
t-butyl-2'-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, 2- (3-t-butyl-2-hydroxy-5-methylphenyl) -5-chlorobenzotriazole, 2- (3'-s-butyl-2'-
(Hydroxy-5′-t-butylphenyl) benzotriazole, 2- (2′-hydroxy-4′-octyloxyphenyl) benzotriazole,

2- (3 ', 5'-di-t-amyl-2'
-Hydroxyphenyl) benzotriazole, 2-
[2′-hydroxy-3 ′, 5′-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2-[(3′-t-butyl-2′-hydroxyphenyl) -5′- (2-octyloxycarbonylethyl) phenyl] -5-chlorobenzotriazole, 2-
[3'-t-butyl-5 '-[2- (2-ethylhexyloxy) carbonylethyl] -2'-hydroxyphenyl] -5-chlorobenzotriazole, 2- [3'-
t-butyl-2'-hydroxy-5 '-(2-methoxycarbonylethyl) phenyl] -5-chlorobenzotriazole, 2- [3'-t-butyl-2'-hydroxy-5'-(2-methoxy Carbonylethyl) phenyl]
Benzotriazole, 2- [3'-t-butyl-2'-
Hydroxy-5- (2-octyloxycarbonylethyl) phenyl] benzotriazole,

2- [3'-tert-butyl-2'-hydroxy-5 '-[2- (2-ethylhexyloxy) carbonylethyl] phenyl] benzotriazole, 2- [2
-Hydroxy-3- (3,4,5,6-tetrahydrophthalimidomethyl) -5-methylphenyl] benzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chlorobenzo Triazole, 2-
(3'-dodecyl-2'-hydroxy-5'-methylphenyl) benzotriazole and 2- [3'-t-butyl-2'-hydroxy-5 '-(2-isooctyloxycarbonylethyl) phenyl] benzo A mixture of triazoles,

2,2'-methylenebis [6- (2H-benzotriazol-2-yl) -4- (1,1,3,3
-Tetramethylbutyl) phenol, 2,2'-methylenebis [4-t-butyl-6- (2H-benzotriazol-2-yl) phenol], poly (3-11) (ethylene glycol) and 2- [3 '-T-butyl-2'-
Hydroxy-5 '-(2-methoxycarbonylethyl)
Phenyl] benzotriazole, poly (3-
11) (Ethylene glycol) and methyl 3- [3-
(2H-benzotriazol-2-yl) -5-t-butyl-4-hydroxyphenyl] propionate,

2-ethylhexyl 3- [3-t-butyl-5- (5-chloro-2H-benzotriazole-2
-Yl) -4-hydroxyphenyl] propionate,
Octyl 3- [3-t-butyl-5- (5-chloro-
2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionate, methyl 3- [3-t-
Butyl-5- (5-chloro-2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionate, 3- [3-t-butyl-5- (5-chloro-2H-
Benzotriazol-2-yl) -4-hydroxyphenyl] propionic acid and mixtures thereof.

As the ultraviolet absorber, preferably, phenyl salicylate, 4-t-butylphenyl salicylate, 2,4-di-t-butylphenyl 3 ′, 5′-
Di-tert-butyl-4'-hydroxybenzoate, 4-
t-octylphenyl salicylate, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone,

2,2'-dihydroxy-4-methoxybenzophenone, bis (5-benzoyl-4-hydroxy-2-methoxyphenyl) methane, 2,2 ', 4,4'
-Tetrahydroxybenzophenone, 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2-
(3 ′, 5′-di-t-butyl-2′-hydroxyphenyl) benzotriazole, 2- (5′-t-butyl-
2′-hydroxyphenyl) benzotriazole, 2-
(2′-hydroxy-5′-t-octylphenyl) benzotriazole,

2- (3-tert-butyl-2-hydroxy-
5-methylphenyl) -5-chlorobenzotriazole, 2- (3'-s-butyl-2'-hydroxy-5 '
-T-butylphenyl) benzotriazole, 2-
(2′-hydroxy-4′-octyloxyphenyl)
Benzotriazole, 2- (3 ′, 5′-di-t-amyl-2′-hydroxyphenyl) benzotriazole,
2- [2′-hydroxy-3 ′, 5′-bis (α, α-
Dimethylbenzyl) phenyl] -2H-benzotriazole.

The amount of the ultraviolet absorber used in the present invention is not particularly limited, but is preferably 0.01 to 1.0 with respect to 100 parts by weight of the polypropylene resin.
Parts by weight, more preferably 0.03 to 0.5 parts by weight, even more preferably 0.05 to 0.3 parts by weight.

The antistatic agent used in the present invention includes
There is no particular limitation, and known ones can be used.
Preferably a surfactant, specifically a nonionic surfactant, an anionic surfactant, a cationic surfactant and an amphoteric surfactant, more preferably a nonionic surfactant. . For example, nonionic surfactants include glycerin fatty acid esters, diglycerin fatty acid esters, sorbitan fatty acid esters,
Propylene glycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene fatty acid alcohol ethers, glycols, N, N'-bis (2-hydroxyethyl) aliphatic amines, N'-
Bis (2-hydroxyisopropyl) aliphatic amines,
N, N'-bis (2-hydroxyethyl) aliphatic amides, N, N'-bis (2-hydroxyethyl) aliphatic amines, and N, N'-bis (2-hydroxyethyl) ) Fatty acid esters of aliphatic amides such as lauric acid, mystinic acid and stearic acid. Further, two or more of these antistatic agents may be used in combination.

Examples of the glycerin fatty acid esters include glycerin monolaurate, glycerin monomyristylate, and glycerin monostearate. Examples of the diglycerin fatty acid esters include:
Diglycerin monolaurate, diglycerin monomyristylate, diglycerin monostearate and the like.Examples of sorbitan fatty acid esters include, for example, polyoxysorbitan lauryl ester, polyoxysorbitan myristyl ester, polyoxysorbitan stearyl ester and the like. Is mentioned.

Examples of the propylene glycol fatty acid esters include propylene glycol lauryl ester, propylene glycol myristyl ester, propylene glycol stearyl ester, and the like. Examples of the polyoxyethylene glycerin fatty acid esters include:
For example, polyoxyethylene glycerin lauryl ester, polyoxyethylene glycerin myristyl ester, polyoxyethylene glycerin stearyl ester and the like, and as the polyethylene glycol fatty acid esters, for example, polyethylene glycol lauryl ester, polyethylene glycol myristyl ester, polyethylene glycol stearyl Esters and the like.

Examples of the polyoxyethylene fatty acid alcohol ethers include polyoxyethylene lauryl alcohol ether, polyoxyethylene myristyl alcohol ether, and polyoxyethylene stearyl alcohol ether.
For example, polyethylene glycol, polypropylene glycol and the like can be mentioned.

N, N'-bis (2-hydroxyethyl)
As the aliphatic amines, for example, N, N′-bis (2
-Hydroxyethyl) laurylamine, N, N'-bis (2-hydroxyethyl) myristylamine, N, N '
-Bis (2-hydroxyethyl) parthymylamine,
N, N'-bis (2-hydroxyethyl) stearylamine, N, N'-bis (2-hydroxyethyl) oleinamine and the like can be mentioned.

The N, N'-bis (2-hydroxyisopropyl) aliphatic amines include, for example, N, N'-bis (2-hydroxyisopropyl) laurylamine,
N, N'-bis (2-hydroxyisopropyl) myristylamine, N, N'-bis (2-hydroxyisopropyl) parthymylamine, N, N'-bis (2-hydroxyisopropyl) stearylamine, N, N ' -Bis (2-hydroxyisopropyl) oleinamine and the like.

N, N'-bis (2-hydroxyethyl)
As the aliphatic amides, for example, N, N′-bis (2
-Hydroxyethyl) laurylamide, N, N'-bis (2-hydroxyethyl) myristylamide, N, N '
-Bis (2-hydroxyethyl) parthymylamide,
N, N'-bis (2-hydroxyethyl) stearylamide, N, N'-bis (2-hydroxyethyl) oleinamine and the like can be mentioned.

As the antistatic agent, glycerin monostearate, stearyl diethanolamine and stearyl diethanolamide are preferred.

The amount of the antistatic agent used in the present invention is not particularly limited, but is preferably 0.01 to 5.0 parts by weight based on 100 parts by weight of the polypropylene resin.
0 parts by weight, more preferably 0.05 to 1.0 part by weight, and even more preferably 0.05 to 0.5 part by weight.

The nucleating agent used in the present invention is not particularly limited, and a known nucleating agent can be used. Examples include metal phosphates, metal benzoates, sorbitol-based nucleating agents and mixtures thereof, rosin-based alkali metal or alkaline earth metal salts, and polymer-type nucleating agents.

The metal phosphates include, for example, sodium bis (4-t-butylphenyl) phosphate, sodium 2,2′-methylenebis (4,6-di-t-butylphenyl) phosphate and [phosphoric acid -2,2'-methylenebis (4,6-di-t-butylphenyl)] dihydroxyaluminum, bis [2,2'-methylenebis (4,6-di-t-butylphenyl) phosphate] hydroxy Aluminum, tris [2,2′-methylenebis (4,6-di-t-butylphenyl) phosphate] aluminum,
Sodium bis (4-t-butylphenyl) phosphate and the like. Examples of the metal salts of benzoic acid include sodium benzoate, lithium benzoate, p-t-
Aluminum butyl benzoate and the like.

As the sorbitol nucleating agent, for example,
1,3: 2,4-bis (o-benzylidene) sorbitol, 1,3: 2,4-bis (o-methylbenzylidene)
Sorbitol, 1,3: 2,4-bis (o-ethylbenzylidene) sorbitol, 1,3-o-3,4-dimethylbenzylidene-2,4-o-benzylidene sorbitol, 1,3-o-benzylidene-2 , 4-o-3,4-
Dimethylbenzylidene sorbitol, 1,3: 2,4-
Bis (o-3,4-dimethylbenzylidene) sorbitol, 1,3-op-chlorobenzylidene-2,4-o
-3,4-dimethylbenzylidene sorbitol, 1,3
-O-3,4-dimethylbenzylidene-2,4-op
-Chlorobenzylidene sorbitol, 1,3: 2,4-
Bis (op-chlorobenzylidene) sorbitol, etc.
And mixtures thereof.

Examples of the rosin-based alkali metal salts include lithium, sodium, and potassium salts of rosin. Examples of the rosin-based alkaline earth metal salts include:
For example, calcium salts and magnesium salts of rosin can be mentioned, and aluminum salts of rosin can also be mentioned.
Examples of the polymer nucleating agent include polyvinyl cyclohexane, polycyclopentene, and the like.

The amount of the nucleating agent used in the present invention is not particularly limited.
The amount is preferably 0.001 to 5.0 parts by weight, more preferably 0.01 to 1.0 part by weight, and still more preferably 0.03 to 0.5 part by weight with respect to 00 parts by weight. is there.

If necessary, other additives may be added to the polypropylene-based resin composition for sanitary ware of the present invention as long as the objects and effects of the present invention are not impaired. Examples of the additive include a neutralizing agent, a sulfur-based stabilizer, a lubricant, a metal deactivator, a flame retardant, a foaming agent, an auxiliary stabilizer, a filler, a pigment, and the like. For example, examples of the neutralizing agent include hydrotalcite, metal salts of higher fatty acids, and alkaline earth metal compounds, and examples of the lubricant include fatty acid amide-based compounds and polyolefin wax-based compounds.

Examples of co-stabilizers include organic peroxides, hydroxylamine and US Pat. No. 4,325,853.
JP, 4,338,244, 5,175,31
No. 2, 5,216,053, 5, 252, 6
No. 43, 4,316,611, DE-A-
4,316,622, 4,316,876, EP-A-589,839, 591,102.
And the like. As fillers, calcium carbonate, silica,
Examples include glass fiber, talc, kaolin, mica, barium sulfate, carbon black, carbon fiber, zeolite, and mixtures thereof.

Further, various antibacterial agents may be added to the polypropylene resin composition for sanitary ware of the present invention as needed, 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. Examples of the organic antibacterial agent include phenyl ether derivatives such as 10,10′-oxybisphenoxaarsine, N-haloalkylthio compounds such as cyclofluanide, and imidazole derivatives such as 2- (4-thiazonyl) benzimidazole. , 2,3,5,6-Detracolor-4
Sulfone derivatives such as-(methylsulfonyl) pyridine,
And quaternary ammonium salts such as cesyldimethylethylammonium bromide. Examples of the inorganic antibacterial agents include, for example, silver compounds such as silver nitrate, silver sulfate, and silver chloride;
Antibacterial agents that support substances that generate metal ions such as copper, silver, zinc and tin on carriers such as ceramics, zeolites, and silica, and antibacterial agents that generate metal ions in which some of the carriers are replaced with metals. Is mentioned.

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 method of melt-kneading the polypropylene resin composition for sanitary ware of the present invention is not particularly limited, and a known melt-kneading method can be used. For example, blending a polypropylene resin (A) and a phenol compound (B),
Examples include a method of pelletizing using a melt extruder, a Banbury mixer, or the like. In addition, the melt kneading may be performed in the presence or absence of an inert gas such as nitrogen, if necessary, in order to adjust the melt index of the polypropylene resin composition for sanitary ware of the present invention, Melt kneading may be performed in the presence of an organic peroxide.

The additives such as the hindered amine light stabilizer (C), the ultraviolet absorber, the antistatic agent, and the nucleating agent may be mixed directly with the polypropylene resin (A) in a predetermined amount. Prepare a masterbatch in which high-concentration additives are blended in advance with the polypropylene resin (A),
This may be blended at the time of melt-kneading or molding to adjust the blending amount of the additive.

The polypropylene resin composition for sanitary ware of the present invention is maintained without deterioration in heat stability, light stability, scratch resistance and rigidity, does not discolor the molded product due to urine, and has good processing stability. Since it is excellent, it can be used for molded articles for sanitary appliances. Specifically, toilet bowl, toilet seat, toilet lid,
It can be used for molded articles such as toilet body cases, warm water flush toilet seat materials, and toilet paper cases.

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 contain the polypropylene resin composition for sanitary ware of the present invention. It is a multilayer molded article having an outermost layer. The layers other than the outermost layer in the multilayer molded body are not particularly limited as long as they can be melt-bonded to the material constituting the outermost layer, for example, an olefin-based thermoplastic resin, or a thermoplastic resin composition. No. Preferably polypropylene-based resin, polyethylene-based resin,
Filler reinforced composite polypropylene resins are preferred.

The method for producing the molded article for sanitary ware of the present invention is not particularly limited, and generally includes an injection molding method, a press molding method, a vacuum molding method, a foam molding method and the like which are industrially used. No. Using these molding methods, integral molding and multilayer molding can be performed. The method for molding the molded article having the outermost layer containing the polypropylene resin composition for sanitary ware of the present invention is not particularly limited, and includes, for example, a polypropylene resin composition for sanitary ware of the present invention and another Examples thereof include a multilayer molding method composed of a resin, a multicolor injection molding method, and a sandwich molding method.

[0076]

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: g / 10 min) Measured at 230 ° C according to JIS K7210. (2) Stereoregularity ([mmmm]) Measured by ¹³ C-nuclear magnetic resonance spectroscopy. For details, see A. The method published by Zambelli et al. (Macromolecules 6, 925, 197).
The isotactic pentad fraction ([m
mmm]).

(3) Content of ethylene-propylene random copolymer component and ethylene content (% by weight) Measured by ¹³ C-nuclear magnetic resonance spectroscopy. (4) Melting point (° C.) Differential scanning calorimeter (DSC-VII manufactured by PerkinElmer)
(Type). The measurement conditions were as follows:
After melting 0 mg at 220 ° C. for 5 minutes under a nitrogen atmosphere,
The temperature was lowered to 50 ° C. at a rate of 5 ° C./min to crystallize. Thereafter, the temperature was raised at a rate of 5 ° C./min, and the temperature of the maximum peak of the obtained melting endothermic curve was defined as the melting point.

(5) Discoloration test of urine Human urine was dropped on the surface of a sheet having a thickness of 3 mm formed by an injection molding machine 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 discoloration:
×, no discoloration: ○

(6) Processing stability test 6 g of pellets were placed in a cylinder of a melt indexer set at 280 ° C., a load was applied by an extrusion rod, and the mixture was heated and melted for 15 minutes. Thereafter, the molten resin was extruded to once solidify the retained matter, and then the melt index (230 ° C.) of the retained matter was measured. The change in MI before and after the retention was determined as the MI ratio (before / after the retention). The MI value after granulation (before retention) is small,
The smaller the ratio, the better the processing stability.

(7) Thermal Stability Test Evaluation was carried out in accordance with JIS K 7212 [General rules for the test method for thermal aging of thermoplastics (oven method)]. Using Toyo Seiki Seisakusho's gear oven,
It was measured at 150 ° C. The time until the test piece (press-formed sheet having a thickness of 1 mm: the preparation method is described in (12)) becomes completely embrittled, in other words, the time until the tensile strength becomes 0 (GO)
Life) was measured.

(8) Light Stability Test An accelerated light resistance test was performed using a Sunshine Super Long Life Weather Meter (WEL-6XS-HCH type) manufactured by Suga Test Instruments. Then, the time during which an abnormal appearance such as a crack (crack) occurred on the surface of the test piece was measured, and the presence or absence of a crack after irradiation for 100 hours or 200 hours was observed. The test conditions are shown below. Specimen dimensions Pressed sheet of 40 mm x 30 mm x 1 mm (thickness) (The preparation method of the specimen is described in (12).) Black panel temperature 83 ° C Operation cycle Continuous irradiation, no water spray Temperature in test layer Dry bulb temperature: 60 ° C Observation of appearance abnormality Crack (crack) observation: Observation by microscope (× 50)

(9) Scratch resistance test A special large-sized UF scratch tester (manufactured by Ueshima Seisakusho) was used. The test was performed by rubbing a work glove on the surface of the test piece. The test piece used was prepared by injection molding. The test conditions were a scratch test condition and a test piece thickness: 3 mm.
t, load: 5 kg, load contact area: 12 cm ² , test speed: 400 mm / min, number of rubbing: 60 reciprocations, work glove (Kameko Co., Ltd.). Gloss measurement conditions are JIS
Z8741. Using a gloss meter GM-3D (manufactured by Murakami Color Research Laboratory) at a measurement angle of 60 °, the scratched surface and the non-scratched surface were measured, and the ratio was defined as the gloss retention.

(10) Bending test The bending test was measured by the method specified in JIS K7203. The test piece used was prepared by injection molding.
The flexural modulus and flexural strength were evaluated under the conditions of a test piece thickness: 6.4 mm, a span length: 100 mm, and a load speed: 2.0 mm / min. The measurement temperature was 23 ° C.

(11) Tensile test The tensile test was performed according to the method specified in ASTM D638.
The test piece used was prepared by injection molding. The test piece thickness was 3.2 mm, the tensile speed was 50 mm / min, and the measurement temperature was 23 ° C.

(12) Preparation of Test Specimen (Molded Body) Hot press molding: A sample (pellet) was pressed at 230 ° C. under a pressure of 50 kg / cm ² using a hot press molding machine.
After heating and melting for 1 minute, the mixture was cooled and solidified at 30 ° C. for 5 minutes to produce a sheet having a thickness of 1 mm. Injection molding: Using an injection molding machine, cylinder temperature: 2
Various test pieces were prepared at 00 ° C. and a mold temperature of 50 ° C.

The following polypropylene resins and additives were used in Examples and Comparative Examples. 1) Polypropylene resin (A) (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]): 0.1.
953, MI: 30 g / 10 min) (PP-2): crystalline homopolypropylene (melting point: 16)
2.2 ° C., stereoregularity ([mmmm]): 0.956,
(MI: 25 g / 10 minutes)

2) Stabilizer Calcium stearate: Calcium stearate S: manufactured by NOF Corporation Phenolic compound (B):

Embedded image Phenol, 2- (1,1-dimethylethyl) -6-methyl-4- [3-[[2,4,8,10-
Tetrakis (1,1-dimethylethyl) dibenzo [d,
f] [1,3,2] dioxaphosphepin-6-yl] oxy] propyl]-(CAS No. 2032
55-81-6) (Sumilyzer GP: manufactured by Sumitomo Chemical Co., Ltd.)

Embedded image

(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 GA80: Sumitomo Chemical Co., Ltd.)
(AO-2): pentaerythritol tetrakis [3
-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (IRGANOX101
0: Ciba Specialty Chemicals (manufactured by) (AO-3): Tris (2,4-di-tert-butylphenyl) phosphite (IRGAFOS168:
Ciba Specialty Chemicals (made)

3) Light stabilizer (HA-1): dimethyl succinate and 4-hydroxy-
Polycondensate of 2,2,6,6-tetramethyl-1-piperidineethanol, molecular weight: 3100 to 4000 (TI
NVIN622LD: Ciba Specialty Chemicals (HA) (HA-2): 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, Inc. (HA-3): Bis (2,2,6,6-tetramethyl-)
4-piperidyl) sebacate, molecular weight; 481 (Sanol LS770: manufactured by Sankyo Co., Ltd.)

4) UV absorber (UV-1): 2,4-di-t-butylphenyl-3,
5-di-t-butyl-4-hydroxybenzoate
(Sumisorb 400: manufactured by Sumitomo Chemical Co., Ltd.)

5) Antistatic agent (AS-1): glycerin monostearate (electrostripper TS-5: manufactured by Kao Corporation)

6) Nucleating agent (NA-1): 2,2'-methylenebis (4,6
-Di-t-butylphenyl) sodium (ADEKA STAB NA-11: manufactured by Asahi Denka Kogyo Co., Ltd.)

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

Example 1 With respect to 80 parts by weight of the polypropylene powder (PP-1) and 20 parts by weight of the polypropylene powder (PP-2), 0.05 part by weight of calcium stearate and 0.05 part by weight of the phenolic compound (B) were added. Parts by weight, (HA-1) 0.05 parts by weight, (UV-1) 0.05 parts by weight, (A
0.05 parts by weight of S-1), 0.2 parts by weight of (NA-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.

This mixture was heated and melt-kneaded in a 40 mm diameter single screw extruder (manufactured by Tanabe Seisakusho Co., Ltd.) at a set temperature of 200 ° C. at a screw rotation speed of 100 rpm to form pellets. This pellet was measured for MI and evaluated for processing stability. In addition, various test pieces were molded, and the performances shown in Tables 4 and 5 were evaluated. The results are shown in Tables 1, 4 and 5.

Example 2 0.05 parts by weight of calcium stearate was further added to 100 parts by weight of polypropylene powder (PP-2).
0.05 parts by weight of the phenolic compound (B), (HA-
2) 0.05 parts by weight, 0.05 parts by weight of (UV-1), 0.05 parts by weight of (AS-1), and 2.6 parts by weight of an ivory pigment are added in advance using a Henschel mixer. Mixed. The blended components are shown in Table 1.

The mixture was melted and kneaded with a 40 mm diameter single screw extruder (manufactured by Tanabe Seisakusho Co., Ltd.) at a set temperature of 200 ° C. and a screw rotation speed of 100 rpm to form pellets. This pellet was measured for MI and evaluated for processing stability. In addition, various test pieces were molded, and the performances shown in Tables 4 and 5 were evaluated. The results are shown in Tables 1, 4 and 5.

Comparative Examples 1 to 5 In Example 1, as in Example 1, 80 parts by weight of the polypropylene powder (PP-1) and 20 parts by weight of the polypropylene powder (PP-2) were used. The procedure was performed in the same manner as in Example 1 except that the procedure was carried out with the formulation shown in Example 3. Specifically, the types and amounts of the stabilizer and the light stabilizer were changed. The results are shown in Tables 2, 3, 4 and 5.
It was shown to.

Comparative Examples 6 and 7 In Example 1, as in Example 1, 80 parts by weight of the polypropylene powder (PP-1) and 20 parts by weight of the polypropylene powder (PP-2) were used. A urine discoloration test and a processing stability test were performed in the same manner as in Example 1, except that the test was carried out using the above formulation.
Specifically, the type and amount of the stabilizer were changed without adding a light stabilizer, an ultraviolet absorber, an antistatic agent, and a nucleating agent. The results are shown in Tables 3, 4 and 5.

[0100]

[Table 1] Ca (St) ₂ : calcium stearate Common additive: ivory pigment (2.6 parts by weight)

[0101]

[Table 2] Ca (St) ₂ : calcium stearate Common additive: ivory pigment (2.6 parts by weight)

[0102]

[Table 3] Ca (St) ₂ : calcium stearate Common additive: ivory pigment (2.6 parts by weight)

[0103]

[Table 4]

[0104]

[Table 5]

Examples 1 and 2 satisfying the requirements of the present invention
Was excellent in processing stability without discoloration due to urine as shown in Table 4, and was maintained without deterioration in heat stability, light stability, scratch resistance and rigidity as shown in Table 5. It turns out to be something.

On the other hand, in Comparative Example 1, the phenolic compound (B) satisfying the requirements of the present invention and a molecular weight of 200
The hindered amine light stabilizer (C) of 0 or more was replaced with a stabilizer (AO-1) which does not satisfy the requirements of the present invention and a (HA-3) having a molecular weight of 481, respectively. And thermal stability is also insufficient.

In Comparative Example 2, a phenolic compound (B) satisfying the requirements of the present invention was replaced with a stabilizer (AO-1) not satisfying the requirements of the present invention. Unsatisfactory, with discoloration due to urine.

In Comparative Example 3, a hindered amine light stabilizer (C) having a molecular weight of 2,000 or more was used without using a phenolic compound (B) satisfying the requirements of the present invention. (HA-3), with insufficient processing stability (large MI ratio) and insufficient thermal stability.

Comparative Example 4 shows a hindered amine light stabilizer (C) having a molecular weight of 2,000 or more, which satisfies the requirements of the present invention.
Is (HA-) having a molecular weight of 481 which does not satisfy the requirements of the present invention.
3), which has discoloration due to urine and has insufficient heat stability. Comparative Example 5 was a phenolic compound (B) satisfying the requirements of the present invention and having a molecular weight of 2,000.
The above hindered amine light stabilizer (C) is not used, and the processing stability is insufficient (the MI ratio is large)
And have insufficient scratch resistance, rigidity, thermal stability and light stability.

Comparative Example 6 is a hindered amine light stabilizer (C) having a molecular weight of 2,000 or more which satisfies the requirements of the present invention.
Is not used, and there is discoloration due to urine.

In Comparative Example 7, the phenolic compound (B) satisfying the requirements of the present invention was replaced with stabilizers (AO-2) and (AO-3) not satisfying the requirements of the present invention, and the requirements of the present invention were changed. It does not use a hindered amine light stabilizer (C) having a satisfactory molecular weight of 2,000 or more, has insufficient processing stability (large MI ratio), and has discoloration due to urine.

[0112]

As described above, according to the present invention, hygiene which is maintained without decreasing heat stability, light stability, scratch resistance and rigidity, has no discoloration of molded articles due to urine, and has excellent processing stability. A polypropylene resin composition for appliances and a molded article for sanitary appliances containing the resin composition can be obtained.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/13 C08K 5/13 5/17 5/17 // (C08L 23/10 (C08L 23/10 67) : 02) 67:02) F term (reference) 2D037 AA13 4F071 AA20 AC01 AC12 AC15 AE05 AE16 AE22 AH19 BC07 4F100 AH02H AH02K AH03H AH03K AK07A AK64A AK66A AL01A AT00B BA02 CA05J CABJJ11 J08 GB08J01 GB08 BB151 CF132 CH023 CH053 EE018 EH049 EH159 EJ016 EJ018 EJ066 EN007 EN008 EN109 ET008 EV178 EW066 FD033 FD036 FD042 FD047 FD058 FD109 FD200 GC00

Claims (7)

[Claims] (1) 100 parts by weight of a polypropylene resin (A) is added with the following general formula (I) (Wherein R ¹ , R ² , R ⁴ and R ⁵ each independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms,
Represents an alkylcycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group, and R ³ represents a hydrogen atom or 1 carbon atom.
To 8 alkyl groups. X is a mere bond, a sulfur atom or a —CHR ⁶ — group (R ⁶ is a hydrogen atom,
8 represents an alkyl group or a cycloalkyl group having 5 to 8 carbon atoms. ). A represents an alkylene group having 2 to 8 carbon atoms or a * -COR ⁷ -group (R ⁷ represents a mere bond or an alkylene group having 1 to 8 carbon atoms, and * indicates that it is bonded to the oxygen side. ). One of Y and Z represents a hydroxyl group, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Hindered amine light stabilizer (C) having 0.03 to 1.0 part by weight of phenolic compound (B) represented by formula (1) and a molecular weight of 2,000 or more.
A polypropylene-based resin composition for sanitary ware, characterized in that the composition comprises from 0.01 to 1.0 part by weight. 2. A polypropylene-based resin (A) comprising a crystalline propylene homopolymer, a propylene homopolymer component or a copolymer component mainly composed of propylene, and propylene and ethylene and / or a C 4-12 carbon atom. The polypropylene-based resin composition for sanitary ware according to claim 1, which is a polypropylene-based copolymer comprising a copolymer component of an α-olefin, or a mixture thereof. 3. The hindered amine light stabilizer (C) is a polymer of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol. 2. The polypropylene resin composition for sanitary appliances according to 1. 4. A polypropylene resin composition for sanitary appliances according to claim 1, wherein at least one selected from an ultraviolet absorber, an antistatic agent and a nucleating agent is blended. A polypropylene-based resin composition for sanitary appliances, comprising: 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 5.