JPH10287778A - Polypropylene resin composition for component of toilet stool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polypropylene resin composition for toilet stool components sufficiently inhibited from being discolored by urine, feces, detergents, etc., having good touch to the hand and skin, good rigidity and thermal aging resistance and good detergent resistance. SOLUTION: This composition comprises 100 pts.wt. highly crystalline polypropylene resin, 0.01-1 pt.wt. hindered amine stabilizer and 0.01-1 pt.wt. aromatic phosphorus antioxidant. It is desirable that the isotactic pentad friction of the highly polypropylene resin is 96% or above.

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 toilet bowl parts, and more particularly, when used for toilet bowl parts, discoloration due to urine and stool, detergent, etc. is suppressed, and it has an excellent touch and feel, rigidity, The present invention relates to a polypropylene resin composition for toilet parts that has good heat aging resistance and good detergent resistance, and in particular, maintains excellent physical properties even under severe conditions exposed to acidic detergents and the like.

[0002] Here, in the present specification, "parts for toilet bowl"
The parts generally used around the toilet, such as a toilet seat, a toilet lid, a washing nozzle for discharging hot water to wash a local area, a main body case of a hot water washing device, and a water tank.

[0003]

2. Description of the Related Art Conventionally, resins used for toilet bowl parts include:
Generally, acrylonitrile-butadiene-styrene resin (hereinafter, abbreviated as ABS resin) has been used. This A
The BS resin has excellent physical properties such as high rigidity, impact resistance and gloss, but has a problem that it is inferior in chemical resistance such as acid resistance and alkali resistance, particularly in acid resistance.

That is, the cause of dirt around the toilet bowl, for example,
Bacteria due to adhesion of urine and feces, stains due to propagation of mold, urea, phosphate, crude protein in scale components, excretion of sick person taking medicine, excretion of excess vitamins due to heavy drinking of soft drinks, urine In recent years, detergents with improved detergency have been developed and used in order to remove organic matter in the stool, as well as water scale, blood, toilet bowl cleaners, flush toilet cleaners, etc. Parts, especially toilet bowls that are cleaned daily,
In the toilet seat, there have been inconveniences such as deterioration of mechanical properties, discoloration and, in severe cases, cracks.

On the other hand, in order to solve such a problem, it is known to use a polypropylene resin having excellent chemical resistance. However, general polypropylene-based resins are not sufficiently satisfactory in physical properties such as rigidity and gloss such as ABS resin, touch feeling, and discoloration resistance for suppressing discoloration caused by urine and stool or detergent. It was strongly desired.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made from the above viewpoint, and discoloration due to urine and stool, detergents, etc. is sufficiently suppressed, and it has an excellent touch feeling, good rigidity, good heat aging resistance, and An object of the present invention is to provide a polypropylene-based resin composition for toilet parts having good detergent resistance.

[0007]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have made the polypropylene resin a highly crystalline polypropylene resin, and further added an additive used for the resin. By using a specific compound, urinary stool, discoloration due to detergents, etc. are suppressed, the feel is excellent to the touch, the rigidity, the heat aging resistance is good, and the detergents have strong detergency, especially strong detergents such as acidic detergents. The present invention has been completed based on the finding that a polypropylene-based resin composition for toilet parts having excellent detergent resistance can be obtained.

That is, the present invention is a polypropylene resin composition for toilet parts, comprising the following components (A) to (C) in the following weight ratios. Component (A): Highly crystalline polypropylene resin (100 parts by weight) Component (B): Hindered amine stabilizer (0.01 to 1)
(Parts by weight) Component (C): aromatic phosphorus antioxidant (0.01 to 1 part by weight) As the highly crystalline polypropylene-based resin used in the polypropylene-based resin composition for toilet parts of the present invention, specifically, And a highly crystalline polypropylene resin having an isotactic pentad fraction of 96% or more.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
First, a highly crystalline polypropylene-based resin (component (A)), a hindered amine-based stabilizer (component (B)) contained in the polypropylene-based resin composition for toilet bowl components of the present invention,
The aromatic phosphorus antioxidant (component (C)) will be described in order, and then the polypropylene resin composition for toilet parts of the present invention will be described.

(A) Highly crystalline polypropylene resin (component (A)) The highly crystalline polypropylene resin used in the present invention includes a highly crystalline polypropylene resin, that is, a single weight of propylene having high crystallinity. There is no particular limitation on the resin as long as the combined portion occupies all or most of the resin.

More specifically, a highly crystalline propylene homopolymer and a resin in which the homopolymer portion of the highly crystalline propylene occupies most of the resin.
Examples thereof include block or random copolymers with α-olefins such as butene, 1-pentene, 1-hexene, and 4-methylpentene-1. Among these highly crystalline polypropylene resins, a highly crystalline propylene homopolymer is preferable for use in the polypropylene resin composition for toilet parts of the present invention.

Among these highly crystalline polypropylene resins, those having an isotactic pentad fraction of 96% or more in the boiling heptane-insoluble portion, which is used as an index of crystallinity in the polypropylene resin, are the present invention. It is suitably used for the polypropylene resin composition for toilet parts of the present invention, and more preferably, a highly crystalline polypropylene resin having an isotactic pentad fraction of 97% or more is used for the resin composition of the present invention.

Here, the above isotactic pentad fraction is a value measured using ¹³ C-NMR (nuclear magnetic resonance method), and the measuring method is generally established.

(B) Hindered amine stabilizer (component (B)) As the hindered amine stabilizer used in the polypropylene resin for toilet bowl parts of the present invention, a hindered amine stabilizer generally used as a stabilizer for a resin composition is used. ,
There is no particular limitation.

Specifically, the following [1] to [11]
The hindered amine-based stabilizer used in the present invention is not limited to these compounds.

[1] Polycondensate of dimethyl succinate and 1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine [2] Poly [[6- (1, 1,3,3-tetramethylbutyl) imino-1,3,5-triazine-2,4-diyl] [2,2,6,6-tetramethyl-4-piperidylimino]] [3] N, N '-Bis (3-aminopropyl) ethylenediamine-2,4-bis [N-butyl-N- (1,2,2
2,6,6-pentamethyl-4-piperidyl) amino]
-6-chloro-1,3,5-triazine condensate

[4] tetrakis (2,2,6,6-tetramethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate [5] bis (2,2,6,6-tetramethyl -4-piperazyl) sebacate [6] N, N'-bis (2,2,6,6-tetramethyl-4-piperidyl) hexamethylenediamine and 1,2-
Polycondensate with dibromoethane [7] Poly [2-N, N'-bis (2,2,6,6-tetramethyl-4-piperidyl) hexamethylenediamine-4- (N-morpholino) simtriazine] [8] 1,1 ′-(1,2-ethanediyl) -bis (3,3,5,5-tetramethylpiperazinone)

[9] Tris (2,2,6,6-tetramethyl-4-piperidyl) -dodecyl-1,2,3,4-
Butanetetracarboxylate [10] tris (1,2,2,6,6-pentamethyl-
4-piperidyl) -dodecyl-1,2,3,4-butanetetracarboxylate [11] bis (1,2,2,6,6-pentamethyl-4
-Piperidyl) sebacate

Among the hindered amine-based stabilizers of the above [1] to [11], those having a molecular weight of 500 or more are particularly suitable for the polypropylene resin composition for toilet parts of the present invention in view of compatibility and long-lasting effect. Is preferable. Also,
Among these compounds, the compounds most suitable for the polypropylene resin composition for toilet parts of the present invention are the compounds of the above [1], [2], [3], [4], and [7] It is. Further, the polypropylene resin composition for toilet bowl parts of the present invention contains one of the above hindered amine stabilizers.
Species can be used alone or in combination of two or more.

(C) Aromatic phosphorus antioxidant (component (C)) The aromatic phosphorus antioxidant used in the polypropylene resin for toilet bowl components of the present invention is generally used as an oxidation stabilizer for a resin composition. The aromatic phosphorus antioxidant used can be mentioned without particular limitation.

Specifically, the following [12] to [2]
0], but the aromatic phosphorus antioxidant used in the present invention is not limited thereto.

[12] Tris (mixed, mono and dinonylphenyl) phosphite [13] Tris (2,4-di-t-butylphenyl) phosphite [14] 4,4-butylidenebis (3-methyl-) 6-t
-Butylphenyl-di-tridecyl) phosphate [15] 1,1,3-tris (2-methyl-4-di-tridecylphosphite-5-t-butylphenyl) butane

[16] bis (2,4-di-butylphenyl) pentaerythritol-diphosphite [17] tetrakis (2,4-di-t-butylphenyl) -4-4'-biphenylenephosphonite [18] bis (2,6-di-butyl-4-methylphenyl) pentaerythritol-diphosphite

[19] 2,2′-ethylidenebis (4,
6-di-t-butylphenyl) fluorophosphite [20] methylenebis (4,6-di-t-butylphenyl) -2-ethylhexyl-phosphite

Among the aromatic phosphorus antioxidants of the above [12] to [20], more preferable compounds for the polypropylene resin composition for toilet parts of the present invention are [13] and [17]. , [18], [19] and [2]
0]. Further, in the polypropylene resin composition for toilet parts of the present invention, one of the above aromatic phosphorus-based antioxidants can be used alone or in combination of two or more.

(D) Polypropylene resin composition for toilet parts of the present invention The polypropylene resin composition for toilet parts of the present invention comprises the above-mentioned highly crystalline polypropylene resin (component (A)), a hindered amine stabilizer (component) (B)) and an aromatic phosphorus antioxidant (component (C)).

The content ratio of the above three components in the polypropylene resin composition for toilet parts of the present invention is such that the hindered amine stabilizer is 0.01 to 1 part by weight based on 100 parts by weight of the highly crystalline polypropylene resin. And the amount of the aromatic phosphorus antioxidant is 0.01 to 1 part by weight. Furthermore, the more preferable content of the hindered amine stabilizer in the polypropylene resin composition for toilet parts of the present invention is 0.02 to 0.5 per 100 parts by weight of the polypropylene resin.
Parts by weight. The more preferable content of the aromatic phosphorus antioxidant in the polypropylene resin composition for toilet parts of the present invention is 0.02 to 0.5 part by weight per 100 parts by weight of the polypropylene resin.

If the content of the hindered amine stabilizer is less than 0.01 part by weight based on 100 parts by weight of the highly crystalline polypropylene resin, the heat aging resistance may not be sufficient. On the other hand, even if the hindered amine-based stabilizer is contained in an amount exceeding 1 part by weight based on 100 parts by weight of the highly crystalline polypropylene-based resin, it is not only uneconomical but also may cause discoloration and bleeding. .

If the content of the aromatic phosphorus antioxidant is less than 0.01 part by weight based on 100 parts by weight of the highly crystalline polypropylene resin, the stability of molding processability becomes insufficient, and It can also have a subtle effect on mechanical properties. On the other hand, if the amount of the aromatic phosphorus antioxidant exceeds 1 part by weight with respect to 100 parts by weight of the highly crystalline polypropylene resin, not only uneconomical but also discoloration problems may occur.

The polypropylene resin composition for toilet bowl parts of the present invention contains the above three components in the above-mentioned content ratio. In the polypropylene resin composition for toilet bowl parts of the present invention, in addition to the above essential components, the present invention Other additional components (arbitrary components) can be contained within a range that does not significantly impair the effects of the invention.

Examples of the additional component (optional component) include a nucleating agent, a lubricant, an antistatic agent, a molecular weight regulator, a foaming agent, a pigment, a dispersant, an ultraviolet absorber, and the aromatic phosphorus antioxidant. Antioxidants, neutralizing agents, antacids, flame retardants, metal deactivators, surfactants, antibacterial agents, inorganic fillers, rubbery components, and the like other than (Component (C)) can be exemplified.

As the nucleating agent, specifically, an aromatic aluminum salt nucleating agent, an aromatic sodium salt nucleating agent,
Examples include a metal nucleating agent based on an aromatic phosphate, a nucleating agent based on sorbitol, and talc.

Specific examples of the above-mentioned lubricant include fatty acid amide and silicone oil. The addition of such a lubricant is suitable for improving the feeling of sitting and preventing dirt.
Examples of the antistatic agent include glycerin esters of fatty acids and amine-based or amide-based antistatic agents. In addition, peroxides and the like can be used as the molecular weight regulator. Further, specific examples of the flame retardant include various phosphorus-based, nitrogen-based, silicon-based, and halogen-based flame retardants.

As the pigment, any of known organic pigments and inorganic pigments can be used. Specifically, organic pigments such as azo, anthraquinone, phthalocyanine, quinacridone, isoindolinone, diosazine, perinone, quinophthalone, and perylene pigments, ultramarine, titanium oxide, titanium yellow, iron oxide (Pigment), chromium oxide, zinc white, and inorganic pigments such as carbon black. As described above, various pigments can be added as optional components to the polypropylene resin composition for toilet parts of the present invention. In the resin composition of the present invention, among these, titanium oxide is the main component. It is possible to exhibit more excellent effects in the light-colored pigment system described above.

As the antibacterial agent, any of an organic antibacterial agent and an inorganic antibacterial agent may be used. Examples of the organic antibacterial agent include chlorine-based, phenol-based, imidazole-based or thiazole-based compounds, and quaternary ammonium compounds. Examples of inorganic antibacterial agents include zeolites, apatites, silica-aluminas, ceramics, zirconium phosphates, silica gels, hydroxyapatites, calcium silicates and the like containing and containing metals such as silver and zinc. Antimicrobial agents.

Further, specific examples of the inorganic filler include talc, barium sulfate, clay, silica, calcium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, glass fibers, whiskers, and the like. As the rubbery component, specifically, ethylene / propylene rubber, ethylene / butene-1 rubber,
Examples include ethylene / hexene rubber, ethylene / octene rubber, and styrene / butadiene rubber. The inorganic filler and the rubber component are added alone or in combination, for example, 1 to 250 parts by weight of the inorganic filler with respect to 100 parts by weight of the highly crystalline polypropylene resin,
By adding the rubber-like component in the range of preferably 5 to 200 parts by weight and the rubbery component in the range of 1 to 20 parts by weight, preferably 3 to 15 parts by weight, the rigidity of the resulting polypropylene resin composition for toilet parts can be improved. Heavy feeling and impact resistance can be imparted.

The polypropylene resin composition for toilet bowl parts of the present invention comprises the above-mentioned highly crystalline polypropylene resin (component (A)), hindered amine stabilizer (component (B)), and aromatic phosphorus-based antioxidant as raw material components. Except for using the agent (component (C)) at the above-mentioned weight ratio and using the above-mentioned additional component in an amount not impairing the effects of the present invention, the same method as that for producing the ordinary polypropylene-based resin composition is used. can do. For example, to the above component (A), the components (B) and (C) are added in the above weight ratio, and if necessary, an appropriate amount of other additional components are added, followed by stirring with a Henschel mixer. After mixing, melt extruding with an extruder and extruding into pellets can be mentioned. The dosage form of the resin composition of the present invention is not particularly limited, but pellets are preferable in consideration of the molding step using the resin composition of the present invention.

The method for producing a toilet part using the resin composition of the present invention can be the same as the method for producing a toilet part using a normal polypropylene resin composition. For example, a method of molding the above-mentioned pellet-shaped resin composition of the present invention by injection molding, injection compression molding, blow molding, sheet molding or the like to form a desired toilet part. In addition, the injection molding includes a gas assist injection molding method,
Two-layer (two-color) injection molding, sandwich injection molding, and the like are also included.

The toilet parts obtained by molding the polypropylene resin composition of the present invention are superior in gloss to conventional products,
It has good rigidity, less dirt and discoloration due to urine and stool, detergents, etc., and also has an excellent texture. In addition, since there is little deterioration due to the detergent and the like, it is excellent in detergent resistance, and also excellent in heat aging resistance, so that more excellent effects can be obtained when used for general-purpose toilet parts and heating-type toilet parts.

[0040]

EXAMPLES The present invention will now be described in more detail with reference to Examples, but it should not be construed that the present invention is limited to these Examples.

[0041]

Example 1 Isotactic pentad fraction was 97
%, MFR (melt flow rate) is 10 g / 10 min (JIS K 721 under the condition of 230 ° C. and 2.16 kg)
100 parts by weight of a highly crystalline polypropylene homopolymer (component (A)) and N, N'-bis (3
-Aminopropyl) ethylenediamine-2,4-bis [N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidyl) amino] -6-chloro-1,3,3
5-triazine condensate (component (B)) (molecular weight: about 20
00) 0.1 part by weight, 0.1 part by weight of tris (2,4-di-t-butylphenyl) phosphite (component (C)), and 0.1 part by weight of calcium stearate as an additional component.
Ivory pigment containing 0.05 parts by weight and 90% titanium oxide (composition: 90% titanium oxide, 0.6% red iron oxide, 9.0% titanium yellow, 0.1% carbon black, 0.3% calcium stearate) Five parts by weight were mixed and sufficiently stirred and mixed by a Henschel mixer. Thereafter, the mixture was melt-kneaded with an extruder at a temperature of 240 ° C. and extruded into pellets to obtain a highly crystalline polypropylene resin composition for toilet bowl parts.

[0042]

Example 2 In Example 1, the component (B) was replaced with a polycondensate of dimethyl succinate and 1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine ( (Molecular weight: 3100-4000) A highly crystalline polypropylene-based resin composition for toilet parts was obtained in exactly the same manner as in Example 1, except that 0.1 part by weight was used.

[0043]

Example 3 Example 2 was repeated except that 0.2 part by weight of erucamide was added as an additional component.
A highly crystalline polypropylene resin composition for toilet parts was obtained in exactly the same manner as in Example 2 above.

[0044]

Example 4 In Example 3, the additional component erucamide was replaced with dimethyl silicon (viscosity 100 cst).
A highly crystalline polypropylene-based resin composition for toilet parts was obtained in exactly the same manner as in Example 3 except that the above was changed.

[0045]

COMPARATIVE EXAMPLE 1 In Example 2, the component (A) was prepared by isotactic pentad fraction of 92% and MFR of 10 g /
A polypropylene resin composition for toilet parts of a comparative example was obtained in the same manner as in Example 1 except that the homopolymer was changed to a general polypropylene homopolymer for 10 minutes.

[0046]

Comparative Example 2 In Comparative Example 1, the component (B) was not used, and instead, the phenolic antioxidant pentaerythyl-tetrakis [3- (3,5-di-tert-butyl-4-) was used. [Hydroxyphenyl) propionate] was used in the same manner as in Comparative Example 1 to obtain a polypropylene resin composition for toilet parts of Comparative Example.

[0047]

Comparative Example 3 In Example 1, the component (B) was not used, and instead, the phenolic antioxidant pentaerythyl-tetrakis [3- (3,5-di-tert-butyl-4-) was used. [Hydroxyphenyl) propionate] was used in the same manner as in Example 1 to obtain a highly crystalline polypropylene resin composition for toilet parts of a comparative example.

[0048]

Comparative Example 4 A highly crystalline polypropylene resin composition for a toilet part was obtained in the same manner as in Example 1 except that the component (B) was removed from the raw material components.

<Evaluation of Highly Crystalline Polypropylene Resin Composition of the Present Invention> The properties of the polypropylene resin compositions obtained in the above Examples and Comparative Examples as toilet parts were evaluated by the following methods.

(A) Molding First, the polypropylene resin compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 were subjected to sheet test (120 × 80 × 2 mmt) and bending elasticity using an injection molding machine. Rate test piece (80 × 10.0 × 4.0 mmt), resin temperature 2
Molding was performed under the conditions of 40 ° C. and a mold cooling temperature of 40 ° C.

(B) Measurement of Physical Properties Using Resin Composition and Molded Specimen The isotactic pentad fraction was measured for the polypropylene resin compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4. Each of the test pieces obtained by molding the resin compositions of the above Examples and Comparative Examples as described above was subjected to a flexural modulus measurement, a stain / discoloration test, an adhesion test, and a heat aging test.

(1) Isotactic Pentad Fraction The polypropylene resin compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 were completely dissolved in boiling xylene, and then cooled to 23 ° C. It was left for 16 hours and allowed to settle. Thereafter, the insoluble portion was separated and filtered, and the obtained insoluble portion was dried. Further, the dried insoluble portion was subjected to boiling heptane extraction for 12 hours using a Soxhlet extraction tube, and the obtained insoluble portion was used as a sample for isotactic pentad fraction measurement. Using this sample, the isotactic pentad fraction in the polypropylene-based resin composition was measured by ¹³ C-NMR (nuclear magnetic resonance method). In addition, ¹³ C
For the measurement of -NMR, 27% of FT-NMR manufactured by JEOL Ltd.
A 0 MHz device was used.

(2) Flexural Modulus The flexural modulus of each of the flexural modulus test pieces produced using the polypropylene resin compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 was measured in accordance with JIS K7203. The measurement was carried out according to the measurement method described above.

(3) Stain / Discoloration Test Each of the sheet test pieces prepared using the polypropylene resin compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 was subjected to an average of 20 persons per day. After being attached to one of the five places in the water storage part of the common Western-style toilet and submerged in a semi-submerged state, and exposed to the back of the toilet seat for 60 days, it was removed and washed with water, and after the test, the degree of stain and discoloration was visually observed. During the test period, the state of use of the toilet was determined in Examples 1 to 3.
4 and Comparative Examples 1-4, the toilet was cleaned daily with a chlorine-based detergent as usual. As for the criterion, if there was a change in any of the above semi-submerged test piece and the test piece attached to the back of the toilet seat, the sample was judged according to the following criterion.

(Judgment Criteria) A: Dirt and discoloration are not conspicuous. ：: Stain and discoloration are slightly observed. Δ: Stain and discoloration are observed. X: Stain and discoloration are remarkably observed.

(4) Adhesiveness test The toilet seat to which each of the sheet test pieces prepared using the polypropylene resin compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 was attached was seated, and then separated. The feeling when sitting was judged according to the following criteria.

(Judgment Criteria) A: When leaving the seat, the skin and the toilet seat feel completely uncomfortable. ○: When leaving, the skin and toilet seat are felt without discomfort. Δ: When leaving the room, the skin feels slightly pulled by the toilet seat. ×: The skin feels sticky when seated, and feels like being pulled when leaving.

(5) Heat Aging Resistance Each of the above-described sheet test pieces produced using the polypropylene resin compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 is based on JIS K 7212-B. Using a gear oven, a heat aging resistance test was performed in which the time until discoloration and cracks occurred was measured in an atmosphere at 120 ° C.

Table 1 shows the above results. In Table 1, a is N, N'-bis (3-aminopropyl) ethylenediamine-2,4-bis [N-butyl-N-
(1,2,2,6,6-pentamethyl-4-piperidyl) amino] -6-chloro-1,3,5-triazine condensate, b is dimethyl succinate and 1- (2-hydroxyethyl) C represents a polycondensate with 4-hydroxy-2,2,6,6-tetramethylpiperidine, and tris (2,4
-Di-t-butylphenyl) phosphite, d is
It represents a phenolic antioxidant, pentaerythyl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate].

[0060]

[Table 1]

As is clear from the results, all of the test pieces molded using the highly crystalline polypropylene-based resin compositions of the examples have high flexural modulus and are excellent in suppressing discoloration due to urine or detergent. It has an excellent touch and good heat aging resistance.

In the stain / discoloration test described above, even after being exposed to a chlorine-based detergent every day, no cracks or the like were generated on the test piece formed using the highly crystalline polypropylene-based resin composition of the example. Therefore, it can be said that the highly crystalline polypropylene resin composition of the present invention has excellent detergent resistance.

EFFECTS OF THE INVENTION The polypropylene resin composition for toilet parts of the present invention is sufficiently suppressed from discoloration due to urine and stool, detergent, etc., has excellent touch feeling, good rigidity, good heat aging resistance, and detergent resistance. Also excellent.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masaru Uchida 1st Tohocho, Yokkaichi-shi, Mie Japan Polychem Co., Ltd. Yokkaichi Technical Center Co., Ltd.

Claims (2)

[Claims] 1. A polypropylene resin composition for toilet parts, comprising the following components (A) to (C) in the following weight ratios: Component (A): Highly crystalline polypropylene resin (100 parts by weight) Component (B): Hindered amine stabilizer (0.01 to 1)
Component (C): Aromatic phosphorus antioxidant (0.01 to 1 part by weight) 2. The polypropylene resin composition for toilet bowl parts according to claim 1, wherein the isotactic pentad fraction of the highly crystalline polypropylene resin is 96% or more.