JPH10298383A - Vinyl chloride-based resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition, having molding stability for a long period and capable of providing a molded product excellent in surface smoothness by compounding a vinyl chloride-based resin with a specific lead compound, basic zinc sulfite phosphite and a metallic soap. SOLUTION: This composition is obtained by compounding a vinyl chloride- based resin with (A) one or more lead compounds selected from the group consisting of white lead, basic zinc sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, dibasic lead stearate and lead stearate, (B) basic zinc sulfite phosphite and (C) a metallic soap (preferably a barium-based metallic soap). A fly ash and an acrylic processing aid can be added to the composition. The ratio (wt.%) of the added components A to B is preferably (0.2:99.8) to (99.8:0.2). The compounding ratio of the total amount of the components A and B to the component C is preferably (99:1) to (70:30).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin composition having long-term molding stability and capable of obtaining a molded article having excellent surface smoothness.

[0002]

2. Description of the Related Art Vinyl chloride resins are inexpensive and have excellent physical properties such as impact resistance and heat resistance, and excellent chemical properties such as solvent resistance and acid resistance. Has been formed into various shapes and used for building materials, pipe materials, and other wide-ranging applications. Due to the fact that the decomposition temperature and the molding temperature of the vinyl chloride resin are close to each other, it is not possible to obtain long-term molding stability even by extrusion molding of the vinyl chloride resin alone. Can not get.
For this reason, when extruding vinyl chloride resin, etc.,
An additive for stabilizing various moldings such as a stabilizer and a solvent is blended with the vinyl chloride resin and used.

However, such a composition in which an additive is blended with a vinyl chloride resin may cause a phenomenon in which a solid adheres to the tip of a mold of a molding machine. This solid material causes scratches, streaks, and the like on the molded body, and adheres to the molded body itself. Therefore, in order to obtain good molded products,
It is necessary to frequently remove this solid from the mold tip,
In each case, the molding machine must be stopped and the end of the contaminated mold must be polished and cleaned, which significantly reduces productivity.

[0004] As a method of reducing the adhesion of solid matter to the tip of the mold of the molding machine, for example, Japanese Patent Laid-Open No.
Japanese Patent Application Publication No. 178449 discloses the use of a needle-shaped material such as wollastonite and potassium titanate as an additive to a vinyl chloride resin. However, in the vinyl chloride resin composition in which the needle-shaped material is simply added together with a conventionally used lead-based stabilizer, the amount of solids adhering to the tip of the mold can be reduced and obtained. It cannot be said that the effect of improving the surface smoothness of the molded article is sufficient.

[0005] Also, JP-A-63-20343 discloses that
A basic lead salt such as tribasic lead sulfate, dibasic lead phosphite and basic lead phosphite is treated with a titanium-based, silane-based or aluminum-based coupling agent for a chlorine-containing resin stabilizer. It has been disclosed. However, even with a vinyl chloride-based resin composition using a chlorine-containing resin stabilizer surface-treated with the coupling agent, the effect of reducing solids adhering to the tip of the mold is sufficiently exhibited. It cannot be said that it has been done. Moreover, the surface treatment with the coupling agent increases the cost of the chlorine-containing resin stabilizer and the vinyl chloride-based resin composition using the same, and reduces the economics of the vinyl chloride-based resin product.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above facts, and has no long-term molding stability with no solid matter adhering to the tip of a mold, and It is an object of the present invention to provide a vinyl chloride resin composition from which a molded article having excellent surface smoothness can be obtained.

[0007]

According to the first aspect of the present invention,
(A) Lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, dibasic lead stearate A vinyl chloride resin composition characterized by comprising at least one lead compound selected from the group consisting of: and lead stearate, (b) basic lead sulfite and (c) metal soap. It is assumed that.

[0008] The invention according to claim 2 is to provide a vinyl chloride resin composition comprising a vinyl chloride resin, fly ash and an acrylic processing aid, wherein (a) lead white, basic lead sulfite, and tribasic lead sulfate. One or more lead compounds selected from the group consisting of dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, dibasic lead stearate and lead stearate; (b) basic sulfurous acid The gist of the present invention is a vinyl chloride resin composition characterized by comprising lead phosphite and (c) a metal soap.

The invention according to claim 3 is characterized in that (a) lead white,
Basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite,
Compounding ratio (weight) of one or more lead compounds selected from the group consisting of dibasic lead phthalate, tribasic lead maleate, dibasic lead stearate and lead stearate and (b) basic lead sulfite %) Is 1:99 to 90:10,
The total amount of one or more lead compounds selected from the above group (a), (b) basic lead sulfite and phosphite, and (c) the mixing ratio (% by weight) of metal soap is 98: 2 to 70:30. 2. The vinyl chloride-based composition according to claim 1, wherein the total weight of (a), (b) and (c) is 0.05 to 20 parts by weight based on 100 parts by weight of the vinyl chloride-based resin. The gist is a resin composition.

The invention according to claim 4 is characterized in that (a) lead white,
Basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite,
Compounding ratio (weight) of one or more lead compounds selected from the group consisting of dibasic lead phthalate, tribasic lead maleate, dibasic lead stearate and lead stearate and (b) basic lead sulfite %) Is 1:99 to 90:10,
The total amount of one or more lead compounds selected from the above group (a), (b) basic lead sulfite and phosphite, and (c) the mixing ratio (% by weight) of metal soap is 98: 2 to 70:30. The total weight of (a), (b) and (c) is 0.05 to 20 parts by weight based on 100 parts by weight of vinyl chloride resin and 0.1 to 50 parts by weight of fly ash. The gist is the vinyl chloride resin composition according to claim 1.

The vinyl chloride resin used in the present invention is not particularly limited. For example, a vinyl chloride homopolymer; a polymerizable polymer having a vinyl chloride monomer and an unsaturated bond copolymerizable with the vinyl chloride monomer; Copolymers with monomers; examples include graft copolymers obtained by graft copolymerizing a vinyl chloride monomer with the polymer. These may be used alone or in combination of two or more.

The polymerizable monomer having an unsaturated bond is not particularly limited as long as it has a radical-reactive double bond and can be copolymerized with a vinyl chloride monomer by a radical polymerization initiator. Α-olefins such as ethylene, propylene and butylene; vinyl esters such as vinyl acetate and vinyl propionate; vinyl ethers such as butyl vinyl ether and cetyl vinyl ether;
(Meth) acrylic acid esters such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl acrylate, and phenyl methacrylate; aromatic vinyls such as styrene and α-methylstyrene; halogenation such as vinylidene chloride and vinylidene fluoride Vinyls; N-substituted maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide; These may be used alone or in combination of two or more.

The polymer for graft copolymerizing the vinyl chloride monomer is not particularly limited as long as it can graft copolymerize the vinyl chloride monomer. For example, ethylene-vinyl acetate copolymer, ethylene-acetic acid Vinyl-carbon monoxide copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate-carbon monoxide copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, acrylonitrile-butadiene copolymer , Polyurethane, chlorinated polyethylene; chlorinated polypropylene and the like.
These may be used alone or in combination of two or more.

The vinyl chloride resin has an average degree of polymerization of 50.
The thing of 0-2000 is preferred. If it is less than 500,
If the mechanical properties of the obtained molded product are reduced, and if it exceeds 2,000, the melt viscosity at the time of molding becomes high, and molding becomes difficult. More preferably, it is 600-1400.

The vinyl chloride resin composition of the present invention can be constituted by adding fly ash and an acrylic processing aid.

(A) Lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, dibasic lead stearate and stearin One or more lead compounds selected from the group consisting of lead oxides and (b) basic lead sulphite phosphite may be those which have been previously surface-treated with a titanium-based, silane-based or aluminum-based coupling agent.

(A) Lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, dibasic lead stearate and stearin Addition ratio (% by weight) of one or more lead compounds selected from the group consisting of lead oxalate and (b) basic lead sulphite phosphite
Is preferably from 0.2: 99.8 to 99.8: 0.2,
The ratio is more preferably 1:99 to 90:10, and still more preferably 10:90 to 50:50.

If the addition ratio of the lead compound selected from the group (a) is less than 0.2% by weight, no interaction with the preferred (b) basic lead phosphite is recognized, and the amount of the lead compound increases. However, it is not possible to sufficiently suppress the plate-out of the solid matter with respect to the tip of the mold or the like, and therefore, the obtained molded product has insufficient surface smoothness, making it difficult to perform continuous molding for a long time. or,
The same applies to the case where the content exceeds 99.2% by weight.

The metal soap (c) is not particularly restricted but includes, for example, barium stearate, calcium stearate, barium oleate, calcium oleate, barium laurate, calcium laurate and the like. In particular, the barium-based metal soap is preferably used in that the lead compound composed of the above-mentioned (a) and (b) exhibits a favorable interaction in the thermal stabilizing effect on the vinyl chloride-based resin.

Fly ash is used to make it difficult for solid matter to adhere to the tip of a mold or the like. The fly ash preferably has an average particle size of 0.1 to 30 μm. If it is less than 0.1 μm, it will be liable to be scattered at the time of charging and mixing the raw materials. Further, fly ash that has been previously surface-treated with a titanium-based, silane-based or aluminum-based coupling agent may be used.

In the present invention, the amount of fly ash is preferably 0.1 to 50 parts by weight based on 100 parts by weight of the vinyl chloride resin. The above addition amount is 0.1
If the amount is less than parts by weight, the effect of suppressing adhesion of solids is reduced,
If the amount exceeds 50 parts by weight, molding becomes difficult, and the appearance of the obtained molded product is impaired. Preferably, it is 1 to 20 parts by weight.

The acrylic processing aid used in the present invention is not particularly restricted but includes, for example, homopolymers or copolymers of alkyl methacrylates such as methyl methacrylate, ethyl methacrylate and butyl methacrylate; , A copolymer with an alkyl acrylate such as ethyl acrylate or butyl acrylate; a copolymer of the above alkyl methacrylate with an aromatic vinyl compound such as styrene, α-methylstyrene or vinyl toluene, and a vinyl cyanide compound such as acrylonitrile or methacrylonitrile. And copolymers. These may be used alone or in combination of two or more.

In the present invention, the amount of the acrylic processing aid is preferably 0.1 to 10 parts by weight based on 100 parts by weight of the vinyl chloride resin. If the addition amount is less than 0.1 part by weight, the appearance of the obtained molded article is impaired, and if it exceeds 10 parts by weight, the load at the time of molding becomes high and molding becomes difficult, so it is limited to the above range. You. Preferably, it is 0.3 to 6 parts by weight.

According to a fifth aspect of the present invention, there is provided a vinyl chloride resin composition according to the first or second aspect, wherein the metal soap (c) is barium stearate. In the present invention, (c) the barium stearate is used as the metal soap, so that (a) lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate are used. Thermal stability by interaction with one or more lead compounds selected from the group consisting of tribasic lead maleate, dibasic lead stearate and lead stearate and (b) a lead compound composed of basic lead sulfite and phosphite There is a pronounced manifestation of the effect.

The total amount of one or more lead compounds selected from the above group (a), (b) basic lead sulfite and phosphite, and (c) the mixing ratio (% by weight) of the metal soap are preferably 99: 1 to 1: 1. 7
0:30, more preferably 95: 5 to 80:20. When the compounding ratio of the metal soap (c) is less than 1% by weight, a favorable interaction with a complex of one or more lead compounds selected from the group (a) and (b) basic lead phosphite is recognized. However, even if the amount is increased, the plate-out of the solid matter with respect to the tip of the mold or the like cannot be sufficiently suppressed. Therefore, the surface smoothness of the obtained molded product is not sufficient, and it is difficult to perform continuous molding for a long time. Also, when it exceeds 30% by weight,
This is the same as the above, and there is a possibility that molding stability such as extrusion fluctuation may be impaired.

The above (a), (b) and (c) are added in an amount of 0.05 to 100 parts by weight of the vinyl chloride resin.
20 parts by weight, preferably 0.1 to 10 parts by weight. If the amount is less than 0.05 part by weight, the vinyl chloride resin is thermally degraded, and the resulting molded article is colored. If the amount is remarkable, the physical properties of the obtained molded article are reduced.

The vinyl chloride resin composition of the present invention may optionally contain a lubricant, a modifier, a filler, an antioxidant, an ultraviolet absorber, an antistatic agent, a coloring agent, and the like. . Further, a plasticizer may be added to such an extent that the effect of the present invention is not impaired.

Examples of the above-mentioned lubricant include waxes such as polyethylene and paraffin; various ester waxes; organic acids such as stearic acid and ricinoleic acid; organic alcohols such as stearyl alcohol; and amides such as dimethylbisamide. And the like.

Examples of the modifier include acrylonitrile-butadiene-styrene copolymer, methyl methacrylate-butadiene-styrene copolymer, chlorinated polyethylene, and acrylic rubber. Examples of the filler include calcium carbonate, talc, clay, mica, barium sulfate and the like.

Examples of the antioxidant include butylated hydroxyanisole, 1,3,5-trimethyl-
Antioxidants such as 2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene are exemplified. Examples of the ultraviolet absorber include a salicylic acid-based, benzophenone-based, benzotriazole-based, cyanoacrylate-based ultraviolet absorber, an ultraviolet stabilizer, and a hindered amine-based light stabilizer (HALS).

Examples of the antistatic agent include polyoxyethylene alkyl ether and sorbitan fatty acid ester. Examples of the coloring agent include titanium oxide, carbon black, zinc white, and the like.

Examples of the plasticizer include dibutyl phthalate (DBP) and diheptyl phthalate (DH).
P), di-2-ethylhexyl phthalate (DOP),
Diisononyl phthalate (DINP), diundecyl phthalate (DUP), dibutylbenzyl phthalate (B
Phthalic acid esters such as BP); di-2-ethylhexyl adipate (DOA), diisononyl adipate (DI
NA) and adipates such as diisodecyl adipate (DIDA).

The vinyl chloride resin composition of the present invention may be in the form of powder or granulated pellets during molding. The method for obtaining a molded article from the vinyl chloride resin composition of the present invention is not particularly limited, and various conventionally known molding methods can be employed. For example, when forming into a pipe, a deformed product, or the like, it can be formed by extrusion molding, and when forming into a joint or the like, it can be formed by injection molding. The extruder used for the extrusion molding is not particularly limited, and an appropriate one can be used. Examples thereof include a single screw extruder, a conical twin screw extruder, and a parallel twin screw extruder. In general, in the case of hot runner injection molding, since the runner portion is heated and the resin is retained, it is easy for solid matter to adhere,
The vinyl chloride resin composition of the present invention can also be suitably molded by hot runner injection molding.

The vinyl chloride resin composition of the present invention comprises:
(A) Lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, dibasic lead stearate, lead stearate It contains one or more lead compounds selected from the group, a stabilizer consisting of a three-component system of (b) basic lead sulphite and (c) metal soap. Stable molding can be performed continuously for a long time with less adhesion of the object, and the surface of the obtained molded article has excellent smoothness.

The details of the mechanism by which the contamination of the tip of the mold or the like during molding is specifically suppressed by the incorporation of the above three-component stabilizer are not clear, but are selected from the above group (a). Due to the formation of a complex salt or the like by one or more lead compounds and (b) basic lead sulfite and interaction with metal soaps, especially barium-based metal soaps, plate-out itself is suppressed and self-cleaning action is provided. It is estimated that also works.

The vinyl chloride resin composition according to the second aspect of the present invention contains, in particular, fly ash and an acrylic processing aid, and the above three-component stabilizer. At the time of molding, the adhesion of solid matter to the tip of the mold and the like is further reduced, stable molding can be performed continuously for a long time, and the surface of the obtained molded body has excellent smoothness.

In the vinyl chloride resin composition according to the third and fourth aspects of the present invention, in particular, the mixing ratio of the stabilizer composed of the above three components in the vinyl chloride resin composition according to the first and second aspects of the invention is specified. By doing so, the interaction of these three-component stabilizers can be maximized, and during molding, solid matter adheres very little to the tip of the mold, and stable molding can be performed continuously for a long time. In addition, the surface of the obtained molded article has excellent smoothness.

The vinyl chloride resin composition of the invention according to claim 5 is characterized in that (a) lead white and basic lead sulfite are obtained by using barium stearate as the metal soap (c) of the above three components. One or more lead compounds selected from the group consisting of tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, dibasic lead stearate, lead stearate; (B) Interaction with a lead compound consisting of basic lead sulfite can be increased, and during molding, adhesion of solid matter to the tip of a mold and the like is extremely small, and stable molding can be continuously performed for a long time. Is possible,
In addition, the surface of the obtained molded article has excellent smoothness.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

(Examples 1-4, Comparative Examples 1-3) Vinyl chloride resin (manufactured by Tokuyama Sekisui Co., polymerization degree 1
000), tribasic lead sulfate (trade name “T
S-102 (G) "), basic lead sulphite phosphite (Shinagawa Kako Co., Ltd., trade name" SX "), barium stearate (Shinagawa Kako Co., trade name" BS "), stearic acid (Kawasaki Fine Chemical Co., Ltd.) , Trade name "F-3") and titanium oxide (trade name "R-650", manufactured by Sakai Chemical Co., Ltd.) using a super mixer (Kawata, 100 liters) by stirring and mixing according to a conventional method. A resin composition was obtained.

The obtained vinyl chloride resin composition was mixed with a single screw extruder (trade name “GT-3” manufactured by Plastic Engineering Laboratory Co., Ltd.).
2)), under the following extrusion conditions, thickness 5 mm, width 30 mm
Was extruded. (Barrel temperature) C1: 160 ° C, C2: 170 ° C, C3: 180 ° C (Mold temperature) AD: 185 ° C, D1: 185 ° C, D2: 185 ° C (Rotation speed) 40 rpm

The moldability of the extrusion molding of Examples 1 to 4 and Comparative Examples 1 to 3 and the appearance of the obtained flat plate were evaluated by the following methods. The evaluation results are shown in Table 1.

(1) Moldability The load at the time of molding was measured, and the presence or absence of solid matter on the mold and the degree thereof were evaluated. One hour after the start of extrusion, the machine was stopped, the mold was disassembled, and the disassembled surface of the mold was visually observed for the presence or absence of the solid matter attached to the mold.

(2) Appearance The obtained flat plate was visually observed for its surface smoothness, and the plate having a smooth surface without adhesion of a white solid substance and having a surface gloss was evaluated as ○, and irregularities such as adhesion of a white solid substance were observed. Those having the surface gloss and having lost the surface gloss were evaluated as x.

[0045]

[Table 1]

(Examples 5 to 7, Comparative Examples 4 to 5) Vinyl chloride resin (manufactured by Tokuyama Sekisui Co., having a degree of polymerization of 8) in the amounts shown in Table 2
00), tribasic lead sulfate (trade name “TS
-102 (G) "), basic lead sulfite (Shinagawa Kako, trade name" SX "), barium stearate (Shinagawa Kako, trade name" BS "), stearic acid (Kawasaki Fine Chemical Co., Ltd.) , Trade name "F-3") and titanium oxide (trade name "R-650", manufactured by Sakai Chemical Co., Ltd.) using a super mixer (Kawata, 100 liter) according to a conventional method with stirring and mixing. A resin composition was obtained.

The obtained vinyl chloride resin composition was subjected to a twin-screw extruder (trade name “OSC-30” manufactured by Nagata Seisakusho).
Granulation was performed under the following extrusion conditions. (Barrel temperature) C1: 120 ° C, C2: 130 ° C, C3: 140 ° C (Mold temperature) AD: 145 ° C, D1: 145 ° C, D2: 145 ° C (Rotation speed) SC: 35 rpm, feeder: 20 rpm (cut) Method) hot cut

Using the resin composition granulated as described above, injection molding was performed under the following conditions. As an injection molding machine, a 100 t injection molding machine (manufactured by Nippon Steel Works, trade name "J
100E-C5 ") to obtain a pipe joint having an inner diameter of 20 mm. (Molding temperature) B1: 170 ° C, B2: 180 ° C, B3: 185 ° C, N
H: 190 ° C (mold temperature) 50 ° C (injection speed) 80% (injection pressure) 70%

The moldability and appearance of the obtained pipe joint in the above Examples and Comparative Examples were evaluated as follows, and the results are shown in Table 2. (1) Moldability After 100 shots, the presence or absence of solid matter adhered to the tip of the molding die was visually observed. (2) Appearance After 100 shots, the resulting pipe joint was visually observed for the occurrence of burning during molding. Regarding the surface smoothness, the appearance of the obtained pipe joint was visually observed, and there was no adhesion of a white solid, etc. Those having lost gloss were evaluated as x.

[0050]

[Table 2]

(Examples 8 to 10 and Comparative Examples 6 to 8) Vinyl chloride resin (manufactured by Tokuyama Sekisui Co., polymerization degree 1000) and fly ash (manufactured by Chichibu Onoda Co., Ltd., trade name: Super Flow "), acrylic processing aid (Mitsubishi Rayon Co., Ltd., trade name" P-530A "), tribasic lead sulfate (Shinagawa Kako Co., trade name" TS-102 (G) "), basic sulfurous acid Lead phosphite (Shinagawa Kako, product name "S
X "), barium stearate (Shinagawa Kako Co., trade name" BS "), stearic acid (Kawasaki Fine Chemical Co., trade name" F-3 ") and titanium oxide (Sakai Chemical Co., Ltd.
The trade name “R-650”) was stirred and mixed in a conventional manner using a supermixer (manufactured by Kawata Corporation, 100 liters) to obtain a vinyl chloride resin composition.

The obtained vinyl chloride resin composition was mixed with a single screw extruder (trade name "GT-3" manufactured by Plastic Engineering Laboratory).
2)), a flat plate of 30 × 5 mm was extruded under the following extrusion conditions. (Barrel temperature) C1: 160 ° C, C2: 170 ° C, C3: 180 ° C (Mold temperature) AD: 185 ° C, D1: 185 ° C, D2: 185 ° C (Rotation speed) 40 rpm

With respect to the moldability and the appearance of the obtained flat plate in the above Examples and Comparative Examples, the following evaluations were made, and the results are shown in Table 3. (1) Moldability The load at the time of molding and the state of adhesion of the solid matter to the mold were evaluated. Regarding the state of the solid matter attached to the mold, the molding was finished one hour after the start of extrusion molding, the mold was disassembled, and the presence or absence of the solid matter was visually observed. (2) Appearance The surface smoothness of the obtained molded article was visually observed.

[0054]

[Table 3]

(Examples 11 to 13, Comparative Examples 9 to 11) Vinyl chloride resin (manufactured by Tokuyama Sekisui Co., polymerization degree: 600) and fly ash (made by Chichibu Onoda Co., Ltd., trade name: Super Flow)), acrylic processing aid (Mitsubishi Rayon Co., Ltd., trade name "P-530A"), tribasic lead sulfate (Shinagawa Kako Co., trade name "TS-102 (G)"),
Basic lead sulfite phosphite (Shinagawa Kako Co., Ltd., trade name "S
X "), barium stearate (Shinagawa Kako Co., trade name" BS "), stearic acid (Kawasaki Fine Chemical Co., trade name" F-3 ") and titanium oxide (Sakai Chemical Co., Ltd.
The trade name “R-650”) was stirred and mixed in a conventional manner using a supermixer (manufactured by Kawata Corporation, 100 liters) to obtain a vinyl chloride resin composition.

The obtained vinyl chloride resin composition was subjected to a twin-screw extruder (trade name “OSC-30” manufactured by Nagata Seisakusho).
Granulation was performed under the following extrusion conditions. (Barrel temperature) C1: 120 ° C, C2: 130 ° C, C3: 140 ° C (Mold temperature) AD: 145 ° C, D1: 145 ° C, D2: 145 ° C (Rotation speed) SC: 35 rpm, feeder: 20 rpm (cut) Method) hot cut

Using the resin composition granulated as described above, injection molding was performed under the following conditions. As an injection molding machine, a 100 t injection molding machine (manufactured by Nippon Steel Works, trade name "J
100E-C5 ") to obtain a pipe joint having an inner diameter of 20 mm. (Molding temperature) B1: 170 ° C, B2: 180 ° C, B3: 185 ° C, N
H: 190 ° C (mold temperature) 50 ° C (injection speed) 80% (injection pressure) 70%

In the above Examples and Comparative Examples, the following evaluations were conducted on the moldability and the appearance of the obtained pipe joints, and the results are shown in Table 4. (1) Moldability After 100 shots, the presence or absence of solid matter adhered to the tip of the molding die was visually observed. (2) Appearance After 100 shots, the resulting pipe joint was visually observed for the occurrence of burning during molding. Regarding the surface smoothness, the appearance of the obtained pipe joint was visually observed, and there was no adhesion of a white solid, etc. Those having lost gloss were evaluated as x.

[0059]

[Table 4]

[0060]

As described above, the vinyl chloride resin composition of the present invention has the above-mentioned constitution, and during molding, substantially no plate-out solid adheres to the tip of the mold and the like, and is stable for a long time. Continuous molding can be performed, and the obtained molded body has no appearance of plate-out solids, and provides an appearance quality having excellent surface gloss.

Claims (5)

[Claims] 1. A vinyl chloride resin comprising (a) lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, A vinyl chloride resin characterized by being blended with one or more lead compounds selected from the group consisting of basic lead stearate and lead stearate, (b) basic lead sulfite and (c) metal soap. Composition. 2. A vinyl chloride resin composition comprising a vinyl chloride resin, fly ash and an acrylic processing aid, comprising: (a) lead white, basic lead sulfite, tribasic lead sulfate, dibasic phosphorous acid One or more lead compounds selected from the group consisting of lead, dibasic lead phthalate, tribasic lead maleate, dibasic lead stearate and lead stearate; (b) basic lead phosphite and (c) A) a vinyl chloride-based resin composition comprising a metal soap; 3. The above (a) lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate,
Compounding ratio (wt%) of one or more lead compounds selected from the group consisting of tribasic lead maleate, dibasic lead stearate and lead stearate and (b) basic lead sulphite phosphite
Is 1:99 to 90:10, and the total amount of one or more lead compounds selected from the above group (a), (b) basic lead sulfite, and (c) the mixing ratio of metal soap (% by weight) ) Is 9
8: 2 to 70:30, and the total weighing of (a), (b) and (c) is 0.05 to 20 parts by weight based on 100 parts by weight of the vinyl chloride resin. The vinyl chloride resin composition according to claim 1 or 2, wherein 4. The above (a) lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate,
Compounding ratio (wt%) of one or more lead compounds selected from the group consisting of tribasic lead maleate, dibasic lead stearate and lead stearate and (b) basic lead sulphite phosphite
Is 1:99 to 90:10, and the total amount of one or more lead compounds selected from the above group (a), (b) basic lead sulfite, and (c) the mixing ratio of metal soap (% by weight) ) Is 9
8: 2 to 70:30, and the total weight of (a), (b) and (c) is 0.05 with respect to 100 parts by weight of the vinyl chloride resin and 0.1 to 50 parts by weight of fly ash.
The vinyl chloride resin composition according to claim 2, wherein the amount is from 20 to 20 parts by weight. 5. The vinyl chloride resin composition according to claim 1, wherein the metal soap (c) is barium lead stearate.