JP2878099B2 - Toilet seat and toilet lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toilet seat and a toilet lid, and more particularly, it is excellent in rigidity, heat resistance, surface scratch resistance, gloss, heavy feeling, etc., has good acid resistance, and is exposed to an acidic cleaning agent. The present invention relates to a toilet seat and a toilet lid in which the above-mentioned excellent physical properties are favorably maintained even under severe conditions.

[0002]

2. Description of the Related Art Conventionally, acrylonitrile-butadiene-styrene resin (hereinafter abbreviated as ABS resin) is generally used as a material resin for a toilet seat and a toilet lid.
This ABS resin has appropriate rigidity. Therefore,
For example, such a resin toilet seat is less bent even when a person sits on it during use, and it is unlikely that the bent toilet seat comes into contact with the toilet body or various electrical components for toilet. In addition, there is an advantage that it has a heavy appearance and can be used without discomfort in combination with a toilet body made of pottery having such an appearance.

[0003]

However, the ABS resin is inferior in chemical resistance such as acid resistance and alkali resistance, particularly in acid resistance. As a result, the toilet seat and toilet lid made of this resin are cleaned with an acidic cleaning agent during cleaning. If the environment exposed to the heat lasts for a long period of time, inconveniences such as deterioration of the mechanical properties such as the above-mentioned rigidity, yellowing, and in the worst case, cracks may occur. In recent years, such toilet seats having a heating element installed therein and having a heating function of about 40 ° C. have become widespread, and the above-mentioned resin toilet seat provided with the heating function and a pair thereof The stool lid has a more remarkable deterioration problem due to exposure to the acidic cleaning agent due to the heat.

On the other hand, it is known that polypropylene is used as a material resin for the toilet seat and the toilet lid. However, general polypropylene, said rigidity and heavy feeling,
Furthermore, physical properties such as heat resistance, surface scratch resistance, gloss, etc. are not sufficient, and various physical properties are greatly degraded even in acid resistance. Therefore, as a material resin of the above toilet seat and toilet lid, it is practically satisfactory. Was not.

In view of the above background, the present invention is excellent in rigidity, heat resistance, surface scratch resistance, gloss, heavy feeling, etc., and also has good acid resistance, etc., and under severe conditions exposed to acidic cleaning agents. Another object of the present invention is to provide a toilet seat and a toilet lid in which the above excellent physical properties are favorably maintained.

[0006]

Means for Solving the Problems The present inventors have intensively studied to solve the above-mentioned problems. As a result, they have found that the above problems can be solved by using a highly crystalline polypropylene composition comprising a highly crystalline polypropylene and a nucleating agent as a material resin for a toilet seat and a toilet lid, and have completed the present invention.

That is, the present invention relates to a toilet seat comprising a highly crystalline polypropylene composition comprising (a) 100 parts by weight of a highly crystalline polypropylene and (b) 0.01 to 5.0 parts by weight of a nucleating agent.

[0008] The present invention also provides a toilet lid comprising the above-mentioned highly crystalline polypropylene composition.

As the highly crystalline polypropylene used in the present invention, known polypropylenes can be used without any limitation. In the present invention, as a material resin of the toilet seat and toilet lid,
In particular, by using such a highly crystalline polypropylene, it becomes possible to provide a toilet seat and a toilet lid having good rigidity, heavy feeling, and acid resistance.

In the present invention, the high crystalline polypropylene is specifically a homopolymer of propylene having high crystallinity. In addition, the high crystalline polypropylene may be a block copolymer of propylene and other monomers in which the homopolymer portion of propylene having high crystallinity occupies most of the total. These polypropylenes
Preferably, the isotactic pentad fraction of the boiling heptane-insoluble portion used as an index of the crystallinity of polypropylene is 0.96% or more, more preferably 0.965 or more. Here, the isotactic pentad fraction of the boiling heptane-insoluble portion refers to the boiling heptane-insoluble portion of polypropylene as defined by A.I. The method was announced by Zambelli et al (Macromolecules 6 9
25 1973) means the value obtained by measuring 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 a polypropylene molecule. The boiling heptane-insoluble part of the polypropylene is, for example, after completely dissolving the polymer in boiling xylene, lowering the temperature to 20 ° C. and allowing it to stand still, then separating and filtering the insoluble part, drying the insoluble part, and soxhlet. It is obtained by performing boiling heptane extraction in an extraction tube.

In the above-mentioned block copolymer having high crystallinity, the homopolymer portion of propylene is preferably contained in an amount of 70% by weight or more, more preferably 80% by weight or more.
Further, in the block copolymer, other monomers constituting the copolymer part of propylene and other monomers include ethylene, 1-butene, 1-pentene, and 4-methylpentene.
Α-olefins such as 1 are preferred. In particular, a propylene ethylene block copolymer is suitable. The propylene ethylene block copolymer preferably has an ethylene content of 0.1 to 80% by weight in the propylene ethylene copolymer part.

In the present invention, the flowability of the highly crystalline polypropylene is not particularly limited, but the melt flow rate (hereinafter, also referred to as MFR) is 0 in consideration of moldability, rigidity and impact resistance. It is preferably from 0.1 to 80 g / 10 min. Here, this melt flow rate is determined in accordance with JIS K7210, with a cylinder temperature of 23.
The value at 0 ° C.

In the present invention, such a highly crystalline polypropylene may be obtained by any method. In general, a Ziegler-Natta type stereospecific catalyst, a titanium-containing catalyst supported on magnesium chloride or a titanium trichloride-modified stereospecific catalyst, and a cocatalyst such as triethylaluminum or diethylaluminum are mixed with propylene or other α-olefins. Those obtained by polymerization in addition to a mixture of the above are preferred.

The polymerization may be carried out in a gas phase or in a liquid phase. The polymerization may be carried out in an inert liquid or an inert solvent with respect to the catalyst.The polymerization may be carried out by introducing hydrogen during polymerization, or the obtained polymer may be prepared by a molecular weight regulator such as an organic peroxide. Degraded ones may be used.

In the present invention, the above-mentioned highly crystalline polypropylene may be used as a mixture with another resin as long as the effects of the present invention are not impaired. Such other resins include, in addition to ordinary polypropylene, homopolymers of α-olefins such as ethylene, 1-butene, 1-pentene and 4-methylpentene-1, or block copolymers of these α-olefins and propylene. Polymers or random copolymers are preferred. In this case, such other resin is not more than 40 parts by weight based on 100 parts by weight of the highly crystalline polypropylene,
Preferably, it is added in an amount of 25 parts by weight or less.

In the present invention, known nucleating agents can be used without any limitation. Specifically, metal carboxylate such as aluminum benzoate, potassium benzoate, sodium benzoate, lithium benzoate, Al-p-butylbenzoate, sodium β-naphthoate, sodium cyclohexanecarboxylate, sodium cyclopentanecarboxylate, etc. -Based compound: sodium bis (4-t-butylphenyl) phosphate, lithium bis (4-t-butylphenyl) phosphate, aluminum bis (4-t-butylphenyl) phosphate, bis (4-t -Butylphenyl) phosphate, magnesium bis (4-t-butylphenyl) phosphate, sodium 2,2′-methylene-bis (4,6-di-t-butylphenyl) phosphate, 2,2 ′ -Methylene-bis (4,6-di-t
-Butylphenyl) phosphate, aluminum 2,2′-methylene-bis (4,6-di-t-butylphenyl) phosphate, 2,2′-methylidene-bis (4,6
-Di-t-butylphenyl) phosphate calcium salt, 2,
Magnesium 2'-methylidene-bis (4,6-di-t-butylphenyl) phosphate, 2,2'-ethylidene-
Bis (4,6-di-t-butylphenyl) phosphate sodium salt, 2,2′-ethylidene-bis (4,6-di-t
-Butylphenyl) phosphate, aluminum 2,2'-ethylidene-bis (4,6-di-t-butylphenyl) phosphate, bis- (4-t-butylphenyl)
Aromatic metal phosphate compounds such as calcium phosphate and magnesium bis- (4-t-butylphenyl) phosphate; dibenzylidenesorbitol, 1.3, 2.4-
Di (methylbenzylidene) sorbitol, 1.3, 2.
4-di (ethylbenzylidene) sorbitol, 1.3
2.4-di (butylbenzylidene) sorbitol, 1.
3,2.4-di (methoxybenzylidene) sorbitol, 1.3,2.4-di (ethoxybenzylidene) sorbitol, 1.3-chlorobenzylidene, 2.4-methylbenzylidenesorbitol, mono (methyl) dibenzylidenesorbitol And the like; and inorganic compounds such as silica, titanium dioxide, carbon black, talc, mica, alum, and pigments. Of these, Al-p-butyl benzoate,
It is most preferable to use 2,2'-methylene-bis (4,6-di-t-butylphenyl) phosphate metal salt, 1.3,2.4-di (methylbenzylidene) sorbitol and the like.

In the present invention, the compounding amount of the nucleating agent is
For 100 parts by weight of the highly crystalline polypropylene, 0.0
It is 1 to 5.0 parts by weight. Of these, 0.05 to 1.0
Parts by weight are preferred. That is, when the nucleating agent is less than 0.01 part by weight, the rigidity is insufficiently developed, and when the amount exceeds 5.0 parts by weight, the effect is flattened out and it is not economical.
The above nucleating agents may be used alone or in combination of two or more.

The highly crystalline polypropylene composition used in the present invention contains, in addition to the above components, inorganic fillers such as wollastonite, barium sulfate, calcium carbonate, and glass, preferably barium sulfate. May be. Here, two or more fillers may be used in combination. The amount of the inorganic filler is preferably 0.1 to 15 parts by weight based on 100 parts by weight of the polypropylene. Further, various additives can be appropriately added to the highly crystalline polypropylene composition to such an extent that the effects of the invention are not impaired. Specifically, phenol-based, organic phosphite-based, organic phosphorus-based antioxidants such as phosphite, thioether-based antioxidants; hindered amine-based light stabilizers; benzophenone-based, benzotriazole-based, benzoate-based ultraviolet absorbers, etc. Nonionic, cationic,
Antistatic agents such as anions; dispersants such as bisamides, waxes, and organic metal salts; chlorine scavengers such as carboxylate salts of alkaline earth metal salts; amides, waxes,
Lubricants such as organometallic salts and esters; decomposers such as oxides and hydrotalcites; metal deactivators such as hydrazines and amineacids; organic compounds containing bromine, phosphoric acid, antimony trioxide, and hydroxides Flame retardants such as magnesium and red phosphorus; organic pigments; inorganic pigments; foaming agents; organic fillers; and inorganic and organic antibacterial agents such as metal ions.

In the present invention, the above-mentioned components can be blended by any ordinary method which is performed by mixing resins without any limitation. For example, after adding the component (b) and the component (c), and if necessary, other additive components to the powder or pellet-shaped component (a) and mixing them with a tumbler or Henschel mixer, the mixture is extruded. A method in which the mixture is melt-kneaded in a machine to form pellets or the like is preferable. The order of addition of each component is not particularly limited, and each component may be mixed in a different order from the above method. Furthermore, a masterbatch in which each component is concentrated and blended at a high concentration can be prepared and mixed and used.

The thus obtained high crystalline polypropylene composition can be molded into a toilet seat or a toilet lid by any method such as injection molding, press molding, extrusion molding, and stamp bubble molding. Usually, it is generally formed by injection molding. This injection molding includes single-axis injection, multi-axis injection, high-pressure injection, low-pressure injection, gas assist injection, melt core molding, insert molding, core back molding, two-color molding,
It may be carried out by any method such as foam molding. Also,
The shape of the toilet seat or toilet lid to be formed is not particularly limited, and may be any known shape. In particular, the toilet seat or toilet lid of the present invention has good rigidity and acid resistance, and its physical properties are well maintained even under warm heat.
It is suitable to be used for a toilet seat in which a heating element is installed and a thermal heating function is provided, and a toilet lid that is paired with the toilet seat. In the present invention, the high-crystalline polypropylene composition used as a material resin for a toilet seat and a toilet lid includes not only the toilet seat and the toilet lid but also various electric components used by being attached to a toilet, such as a deodorizer and a heating / heating unit. Even when used as a material for a body of equipment or the like, the same excellent effects as those of the above-mentioned toilet seat and the like can be obtained.

[0021]

As described above, the toilet seat and toilet lid of the present invention satisfactorily satisfy all the desired physical properties such as rigidity, surface scratch resistance, luster, and heavy feel. And it is also excellent in acid resistance and heat resistance, and has the effect of maintaining the above-mentioned various properties well even if it is subjected to cleaning with an acidic cleaning agent, in particular, the cleaning under heat and heating for a long period of time. .

[0022]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(1) Isotactic pentad fraction of boiling heptane-insoluble portion After completely dissolved in boiling xylene, the temperature was lowered to 20 ° C.
After allowing to stand still for a period of time, the insoluble portion was separated and filtered, the insoluble portion was dried, and boiling heptane was extracted with a Soxhlet extraction tube for 8 hours. Zambelli
(Macromolecule).
es 6 925 1973), the fraction of propylene monomer units at the center of a chain of five meso-bonded propylene monomer units in pentad units in the polypropylene molecule was determined.

(2) MFR Measurement was performed according to JIS K7210.

(3) Gloss The high-crystalline polypropylene composition was mixed with an injection molding machine at 80
× 50 × 3mm into a flat plate.
According to IS K7105, incident angle 60 °, light receiving angle 60 °
Was measured.

(4) Pencil hardness According to JIS K5401, a depth of 3 μm
The pencil hardness when the above scratches occurred was measured.

(5) Deflection amount of the toilet seat The gap between the lower end of the toilet seat at the D portion of the toilet seat shown in FIG.
mm, the toilet seat was incorporated into the toilet. Then
A 25 kg weight was applied to each of the toilet seats A to D shown in FIG. 2 at a temperature of 23 ° C. or 40 ° C. using a cylindrical weight jig having a diameter of 30 mm. The gap between the lower end of the toilet seat and the toilet at the portion D of the toilet seat where the deflection was caused by this load was measured, and the amount of deflection deformation was compared.

(6) Hue difference before and after acid immersion The hue before and after acid immersion of the toilet seat was measured according to JIS K7105, and the difference was determined.

(7) Heavy feeling The heavy feeling of the ceramic toilet was visually inspected. ○ is excellent in heavy feeling, its texture matches well with the heavy feeling of the toilet, △ has some heavy feeling, but the texture is not enough in combination with the toilet, it is quite uncomfortable, × is heavy It was hardly felt and was shown as having a strong discomfort to the toilet.

Examples 1 to 3 When the isotactic pentad fraction was 0.970% and M
100 parts by weight of a highly crystalline polypropylene homopolymer having an FR of 12 g / 10 min, Al-p-butylbenzoate in the amount shown in Table 1, 0.04 parts by weight of a hindered phenol-based antioxidant, and a phosphide-based antioxidant 0.04
Parts by weight, and 1.3 parts by weight of an ivory pigment, and sufficiently mixed by stirring with a Henschel mixer.
Thereafter, the mixture is melt-kneaded by an extruder at a temperature of 230 ° C.
Pellets of a highly crystalline polypropylene composition were obtained by strand cutting. The MFR and gloss of this highly crystalline polypropylene composition were measured, and the results are shown in Table 1.

Next, the above-mentioned highly crystalline polypropylene composition was subjected to injection molding to prepare a standard type toilet seat and a toilet lid paired therewith as shown in FIG. This toilet seat has a length of 370 cm, a width of 380 cm, a hollow portion of 270 cm, a hollow portion of 200 cm in width, a plate thickness of 5 mm, and four supporting portions for the toilet. It was assumed. The pencil hardness of the obtained toilet seat,
The amount of flexural deformation, hue, and heavy feel were measured. Subsequently, after this toilet seat was immersed in 3N hydrochloric acid for 200 days at a temperature of 40 ° C., the amount of flexural deformation, hue, and heavy feel were measured. Table 2 shows the above physical properties.

Comparative Example 1 A test was conducted in the same manner as in Example 2 except that an ABS resin was used instead of the highly crystalline polypropylene homopolymer. The results are shown in Tables 1 and 2.

Comparative Example 2 In Example 2, the isotactic pentad fraction was changed to 0.95% in place of the highly crystalline polypropylene homopolymer.
The same test as in Example 2 was performed except that polypropylene was used. The results are shown in Tables 1 and 2.

Comparative Example 3 A test was conducted in the same manner as in Example 2 except that Al-p-butylbenzoate was not used. The results are shown in Tables 1 and 2.

Example 4 A test was conducted in the same manner as in Example 2 except that 10 parts by weight of barium sulfate was further added to the highly crystalline polypropylene composition. The results are shown in Tables 1 and 2.

Example 5 The procedure of Example 2 was repeated, except that the content of the propylene ethylene copolymer part was changed to 11 in place of the highly crystalline polypropylene homopolymer.
% By weight, the ethylene content in the propylene-ethylene copolymer part was 67% by weight, and the MFR was 13 g / 1.
At 0 min, the isotactic pentad fraction is 0.9
The same test as in Example 2 was performed except that a highly crystalline propylene ethylene block copolymer of 75% by weight was used. The results are shown in Tables 1 and 2.

Examples 6 and 7 In Example 2, sodium 2,2'-methylene-bis (4,6-di-t-butylphenyl) phosphate or 1.3 was used in place of Al-p-butylbenzoate. , 2.4
The same test as in Example 2 was performed, except that -di (p-methylbenzylidene) sorbitol was added. Table 1 shows the results
And Table 2.

[0038]

[Table 1]

[0039]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a view showing a typical shape of a toilet seat of the present invention.

FIG. 2 is a diagram illustrating a method for measuring the amount of bending deformation of a toilet seat according to an embodiment of the present invention.

[Description of Signs] 1 Toilet seat 2 Joint with toilet 3 Support for toilet 4 Weighting jig

Claims (2)

(57) [Claims] 1. A toilet seat comprising a highly crystalline polypropylene composition comprising (a) 100 parts by weight of a highly crystalline polypropylene and (b) 0.01 to 5.0 parts by weight of a nucleating agent. 2. A toilet lid comprising the highly crystalline polypropylene composition according to claim 1.