JP2002060640A - Stabilized halogen-containing resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new stabilized halogen-containing resin composition, nontoxic and generating no bubble, having no problem in initial and intermediate coloring property, excellent in heat stability and also in cost-to-performance ratio. SOLUTION: This stabilized halogen-containing resin composition contains as effective components, 0.1-10 pts.wt. highly dispersible calcium hydroxide minute particle (a) of this invention, whose surface is treated with a 0.1-10 wt.% anion surfactant and which has an average secondary particle diameter at 50% accumulation of not larger than 2 μm, and a BET specific surface area of 7-20 m2/g, 0.001-1 pts.wt. perchlorate (b), 0.01-2 pts.wt. zinc compound (c), and 0-2 pts.wt. partial ester of a polyhydric alcohol or a polyhydric alcohol (d), based on 100 pts.wt. halogen-containing resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a stabilized halogen-containing resin composition containing calcium hydroxide. More specifically, the present invention relates to a halogen-containing resin composition excellent in heat stability, initial coloring property, middle coloring property, non-foaming property, non-toxicity, and economic efficiency. Further, the present invention relates to a method for producing fine particles, high dispersibility, and high purity calcium hydroxide.

[0002]

2. Description of the Related Art Halogen-containing resins are unstable to heat and light. Therefore, various heat stabilizers have been used. Examples of the heat stabilizer include lead compounds, organotin compounds, and Ba.
/ Zn-based, Cd / Ba-based and Ca / Zn-based composite organic acid salts, zeolites, hydrotalcites and the like are used.

[0003]

In recent years, there has been an increasing demand for non-toxic heat stabilizers, and the use of Cd-based, Pb-based, and organotin-based materials has been banned worldwide. The Ba system is also toxic and its use is being suppressed. For this reason, non-toxic Ca / Zn-based, zeolite and hydrotalcite-based alternatives to Pb-based and organotin-based are being studied.

[0004] However, the Ca / Zn system has a problem that the heat stabilizing effect is too low. Although zeolite and hydrotalcite have better thermal stability than Ca / Zn system, there is a problem of foaming of a molded product unless the blending amount is kept low because of crystallization water. Accordingly, an object of the present invention is to provide a new stabilized halogen-containing resin composition which is non-toxic, does not generate foaming, has excellent thermal stability, and has excellent price competitiveness.

[0005]

According to the present invention, 0.1 to 10 parts by weight of (a) 0.1 to 10 parts by weight, preferably 0.5 to 2 parts by weight, is added to 100 parts by weight of a halogen-containing resin. Calcium hydroxide surface-treated with an anionic surfactant, preferably an average secondary particle diameter of 50% of the cumulative calcium hydroxide is 2 μm or less and a BET specific surface area is 7 to 2
0 square meters / g. More preferably, the average secondary particle diameter of the 50% cumulative calcium hydroxide is 1.5 μm.
(B) 0.001 to 1 part by weight of perchlorates, preferably perchloric acid-containing hydrotalcites and / or sodium perchlorate, having a BET specific surface area of 10 to 20 m 2 / g (C) 0.01 to 2 parts by weight of a zinc compound, preferably an organic acid salt of zinc, (d)
Provided is a stabilized halogen-containing resin composition containing, as an active ingredient, 0 to 2 parts by weight of a partial ester of a polyhydric alcohol or a polyhydric alcohol. Furthermore, the present invention relates to high-purity quicklime (Si) fired at 800 to 1000 ° C.
O ₂ = 0.2% or less, Al ₂ O ₃ = 0.1% or less, Fe ₂ O
₍₃ = 0.05% or less) is provided at 50 ° C. or higher, followed by surface treatment and water sieving.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Conventional calcium hydroxide is nontoxic and inexpensive, but as a heat stabilizer for halogen-containing resins, it is poorly dispersed in the resin and has a problem of strong initial and intermediate coloring, and is easily carbonated. However, there is a problem in that the storage stability is liable to be changed to inactive calcium carbonate, and it is hardly used as a heat stabilizer. However, the dispersibility and carbonation are significantly improved by the surface treatment of calcium hydroxide, and the use of perchlorates and a zinc compound, preferably an organic acid salt of zinc, can prevent the initial and intermediate coloring. It has become possible to use calcium hydroxide as a heat stabilizer.

Further, the inventors have invented a 50% cumulative average secondary particle diameter of 2 μm or less, preferably 1.5 μm or less, and a BET specific surface area of 7 to 20 m 2 / m 2.
g, preferably 10 to 20 square meters / g, by using a novel calcium hydroxide, the heat stability, storage stability and processability, the appearance of the molded product and the like were greatly improved. As a result, it has become possible to substitute lead-based materials, which are extremely difficult in terms of both thermal stability and cost, which were difficult with conventional heat stabilizers.

As the calcium hydroxide surface-treated with 0.1 to 10% by weight of an anionic surfactant used in the present invention, conventional calcium hydroxide can be used after being surface-treated, but preferably, it is used in a cumulative form. The 50% average secondary particle diameter is 2.0 μm or less, preferably 1.5 μm or less, particularly preferably 1.0 μm or less, and the BET specific surface area is 7 μm or less.
~ 20 square meters / g, preferably 10-20 square meters / g, particularly preferably 10-15 square meters / g
g of calcium hydroxide is used. Further, it is preferable that the average secondary particle diameter of 90% of the accumulation is 8 μm or less, especially 5 μm.
Use calcium hydroxide having a size of not more than μm. The secondary particle size here is determined from the particle size distribution measured by a laser diffraction method after ultrasonic dispersion treatment in an isopropyl alcohol solvent for 5 minutes.

The production of calcium hydroxide used in the present invention can be carried out by the following two methods. The first production method, sodium hydroxide, under stirring to an aqueous solution of an alkali metal hydroxide such as potassium hydroxide, calcium chloride, a water-soluble calcium salt aqueous solution such as calcium nitrate to calcium,
After the addition reaction at an alkali ratio of at least equivalent, preferably 1.1 to 1.3 times equivalent, preferably at about 40 to 120 ° C,
Particularly preferably, after heating and aging at about 40 to 80 ° C. for about 0.1 to 2 hours, it can be produced by a method of adding an anionic surfactant and treating the surface. The reaction is preferably carried out at a temperature of about 30 to 90 ° C.

[0010] The second production method is a method of calcining high-purity natural limestone at 800 to 1000 ° C to obtain quicklime (SiO 2).
₂ = 0.2% or less, preferably 0.1% or less, Al ₂ O ₃
= 0.1% or less, preferably 0.05% or less, Fe ₂ O ₃
= 0.05% or less, preferably 0.01% or less) with water at 50 to 100 ° C, preferably about 60 to 90 ° C to form slaked lime, followed by surface treatment with an anionic surfactant. Then, preferably before or after the surface treatment,
100 mesh or more, preferably about 200 mesh to 5
Water sieve through a 00 mesh sieve. Thereafter, conventional processes such as filtration, drying, pulverization, classification, and the like can be appropriately selected and used to manufacture. Surface treatment can also be performed after water sieving. Further, slaked lime may be further pulverized by a ball mill and used.

The surface treatment of calcium hydroxide used in the present invention prevents carbonation and improves dispersion in the resin. Examples of the surface treatment agent include higher fatty acids, alkali metal salts of higher fatty acids, phosphate esters, silanes, titanium and aluminum coupling agents, esters of polyhydric alcohols and fatty acids, and the like. Particularly preferred are alkali metal salts of higher fatty acids such as sodium laurate and sodium stearate.

The surface coating of calcium hydroxide with a surface treating agent can be carried out by a method known per se. For example, the surface treatment agent may be added to a slurry of calcium hydroxide in a liquid or emulsion state, and sufficiently mechanically mixed at a temperature equal to or higher than the dissolution temperature of the surface treatment agent (wet method). Alternatively, the surface treatment agent may be added to the calcium hydroxide powder in a liquid, emulsion, or solid state by using a mixer such as a Henschel mixer under high-speed stirring, as it is, or by diluting or dissolving it in an appropriate solvent. What is necessary is just to mix well without heating (dry method). The addition amount of the surface treatment agent can be appropriately selected, but is about 0.1 to 10% by weight, preferably 0.5 to 5% by weight based on the weight of the calcium compound.
% By weight. After the surface treatment, if necessary, for example, means such as washing, dehydration, granulation, drying, pulverization, and classification can be appropriately selected and carried out to obtain a final product form. A preferred surface treatment method is a wet method. The amount of calcium hydroxide used is 0.1 to 10 parts by weight, preferably 0.2 to 5 parts by weight, and more preferably 0.5 to 2 parts by weight, based on 100 parts by weight of the halogen-containing resin.

The perchlorate (b) used in the present invention is, for example, a metal salt of perchloric acid such as Na, K, Ca, Ba, etc .;

Embedded image (Wherein, M ²⁺ represents Mg and / or Zn;
A ^n- represents an anion of n (= 1 to 4) valence such as CO ₃ ^2- ; preferably CO ₃ ^2- ; x, y, z and m are the following conditions, respectively, in the range of 0.1 <x <0.5, preferably 0.
2 ≦ x ≦ 0.4, 0.1 <y <0.5, preferably 0.
2 ≦ x ≦ 0.4, 0 ≦ z <y, y + nz = x, 0 ≦ m <
Perchloric acid-containing hydrotalcites represented by 0 or a positive number that satisfies 3.). Of the above, particularly preferred are perchloric acid-containing hydrotalcites and sodium perchlorate. The amount of perchlorate used is based on 100 parts by weight of the halogen-containing resin.
0.001 to 1 part by weight, preferably 0.01 to 0.1 part by weight, about 1 to 10% by weight based on calcium hydroxide.

The zinc compound used in the present invention includes, for example, organic acid salts, oxides, hydroxides and carbonates of zinc. Among them, preferred is an organic acid salt of zinc, and examples of the organic acid include acetic acid,
Bropionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, neodecanoic acid, 2-ethylhexyl acid, berargonic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, isostearic acid, stearin Acid, 1,2-hydroxystearic acid, behenic acid, montanic acid, benzoic acid, monochlorobenzoic acid, pt-butylbenzoic acid, dimethylhydroxybenzoic acid, 3,5-ditert-butyl-4-hydroxybenzoic acid , Toluic acid, dimethylbenzoic acid, ethylbenzoic acid, cumic acid, n-propylbenzoic acid, aminobenzoic acid, N, N-dimethylbenzoic acid, acetoxybenzoic acid, salicylic acid, pt-octylsalicylic acid, oleic acid, elaidin Acid, linoleic acid, linolenic acid, thiglycolic acid, mel Putopuropion acid, monocarboxylic acids such as octyl mercaptopropionic acid, oxalic acid,
Malonic acid, succinic acid, glutanic acid, adipic acid, bimeric acid, suberic acid, azelaic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, oxyphthalic acid, chlorophthalic acid, aminophthalic acid, maleic acid, fumaric acid, citraconic acid And mono- or mono-amide compounds of dicarboxylic acids such as metaconic acid, itaconic acid, aconitic acid and thiodipropionic acid, and di- or triester compounds of tri- or tetra-carboxylic acids such as merit acid. The amount of the organic salt of zinc is 0.01 to 100 parts by weight of the halogen-containing resin.
It is 2 parts by weight, preferably 0.05 to 1 part by weight, particularly preferably 0.1 to 0.8 part by weight.

The (d) partial ester or polyhydric alcohol of the polyhydric alcohol used in the present invention includes, for example, polyhydric alcohols such as mannitol, xylitol, sorbitol, trimethylolpropane, pentaerythritol, dipentaerythritol and glycerin. Can be illustrated. Examples of mono- or polycarboxylic acids that form esters with polyhydric alcohols include acetic acid, lactic acid, 4-hydroxybutyric acid, malonic acid, succinic acid, maleic acid, adipic acid, glutaric acid, itaconic acid, malic acid, tartaric acid, Examples thereof include citric acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, and pyromellitic acid. The polyhydric alcohol partial ester can be produced by reacting at least one of these polyhydric alcohols with at least one of mono- or polycarboxylic acids. The amount of the polyhydric alcohol partial ester or polyhydric alcohol used in the present invention is 0 to 100 parts by weight of the halogen-containing resin.
It is 2 parts by weight, preferably 0.05 to 1 part by weight. Their function is mainly to improve the thermal stability.

The (e) phosphites used in the present invention include:
Specific examples are as follows. Triphenyl phosphite, tris (nonylphenyl) phosphite, tri (monononyl / dinonylphenyl) phosphite,
Tris (2,4 di-t-butylphenyl) phosphite, monooctyl diphenyl phosphite, dioctyl monophenyl phosphite, monodecyl diphenyl phosphite, didecyl monophenyl phosphite, tridecyl phosphite, trilauryl phosphite, Tristearyl phosphite, bisphenol A tetra C
Phosphite stabilizers such as _12-15 alkyl diphosphite, hydrogenated 4,4'-isopropylidene diphenol phosphite, distearyl pentaerythritol diphosphite. The amount of the (e) phosphite used in the present invention is 0.00 0.00 parts by weight based on 100 parts by weight of the halogen-containing resin.
It is 1-2 parts by weight, preferably 0.01-0.5 parts by weight. The function of the phosphites is to reduce coloring.

The β-diketone compound (e) used in the present invention has the following formula (2)

Embedded image Wherein R ₁ and R 3 may be the same or different and are straight-chain or branched alkyl or alkenyl, aryl or aryl having up to 30 carbon atoms.
An alicyclic group (the alicyclic group may optionally contain a carbon-carbon double bond, one of which may be a hydrogen atom), R ₂ is a hydrogen atom, an alkyl group, an alkenyl group; ). Representative compounds of such β-diketone compounds include dehydroacetic acid, ethyl acetoacetate, dibenzoylmethane (DBM), stearoylbenzoylmethane (SBM), benzoylacetone, acetylacetone and the like. β-
The diketone is used in an amount of 0.01 to 2 parts by weight, preferably 0.05 to 0.2 part by weight, per 100 parts by weight of the halogen-containing resin.
5 parts by weight. The function of the β-diketone is to reduce the initial coloration.

The following are examples of the halogen-containing resin used in the present invention. Polyvinyl chloride, polyvinylidene chloride, chlorinated polyethylene, chlorinated polypropylene, chlorinated rubber, vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-propylene copolymer, vinyl chloride-styrene copolymer Copolymer, vinyl chloride-isobutylene copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-styrene-maleic anhydride terpolymer, vinyl chloride-styrene-acrylonitrile copolymer, vinyl chloride-butadiene copolymer , Vinyl chloride-isoprene copolymer, vinyl chloride-chlorinated propylene copolymer, vinyl chloride-vinylidene chloride vinyl acetate terpolymer, vinyl chloride-acrylate copolymer, vinyl chloride-maleate copolymer Coal, vinyl chloride-methacrylate copolymer, vinyl chloride-
Chlorine-containing synthetic resins such as acrylonitrile copolymer and vinyl chloride-various vinyl ether copolymer. Blends, block copolymers, graft copolymers, etc. of these chlorine-containing synthetic resins with each other or with other synthetic resins containing no chlorine.

The resin composition of the present invention may contain other conventional additives. The following can be exemplified as such other additives. Epoxy stabilizers such as epoxidized vegetable oils, epoxidized oleic esters, epoxidized and erucic esters. Sulfur-containing compound-based stabilizers such as thiodipropionic acid and diethylthiodipropionate. Phenolic stabilizers such as phenols such as alkyl gallates and alkylated phenols, and styrenated phenols. Α-amino acids such as glycine, alanine, leucine, isoleucine, glycinamide, histidine ethyl ester, tryptophan benzyl ester, and functional derivatives thereof; Styrenated paracresol, 2,6-di-tert-butyl-4-methylphenol, butylated anisole, 4,4'-methylenebis (6-tert-butyl-3-methylphenol), 2,
2'-methylenebis (6-tert-butyl-4-methylphenol), 1,3,5-trimethyl-2,4,6-tris (3,5-ditert-butyl-4-hydroxybenzyl) benzene , Tetrakis [3- (4-hydroxy-
3,5-di-tert-butylphenyl) propionyloxymethylene] methane and the like. The function of the antioxidant is to improve the thermal stability.

The amounts of these additives can be selected as appropriate. For example, about 0.01 to about 5 parts by weight of a stabilizing aid, about 0.01 to about 2 parts by weight, per 100 parts by weight of the halogen-containing resin. Examples are parts by weight of antioxidants. The present invention, other than the above additives, other conventional additives, such as plasticizers, lubricants,
A processing aid, a weather resistance improver, an antistatic agent, an antifogging agent, a reinforcing agent, a filler, a pigment, and the like may be blended. In the present invention, the mixing and kneading of the halogen-containing resin, the additive of the present invention, and other additives may be performed by a conventional method capable of uniformly mixing the two. For example, any mixing and kneading means such as a single-screw or twin-screw extruder, a roll, and a Banbury mixer can be adopted. There is no particular limitation on the molding method, and any molding means such as injection molding, extrusion molding, blow molding, press molding, rotational molding, calendar molding, sheet forming molding, transfer molding, lamination molding, vacuum molding, etc. is employed. it can.

Hereinafter, the present invention will be described in more detail with reference to Examples. In each of the following examples,% means% by weight unless otherwise specified.

[0022]

Example 1 High-purity limestone crushed to a size of about 4 to 6 cm in diameter was placed in an electric furnace and fired at 900 ° C. for 10 hours. 100 g of the obtained quick lime (CaO) was added to about 2 liters of warm water at about 70 ° C. with stirring, and stirring was continued for about 30 minutes to digest. Thereafter, an aqueous solution (about 70 ° C.) in which 4.4 g of sodium stearate (purity: 90%) was dissolved was added in about 20 minutes.
0 ml was added under stirring with slaked lime slurry (about 75 ° C. or more), and stirring was continued for about 20 minutes to perform surface treatment. The slurry was filtered through a 200-mesh sieve to remove coarse particles, filtered, washed with water, and dried at about 120 ° C. for 8 hours.
The dried product was pulverized with an atomizer made by Fuji Paudal. The obtained powder was placed in an isopropyl alcohol solvent, and after a dispersion treatment for 5 minutes using ultrasonic waves, the secondary particle diameter was measured by a laser diffraction particle size distribution analyzer manufactured by Seishin. As a result, the average secondary particle diameters of the cumulative 50% and 90% were 1.29 μm and 6.51 μm, respectively. The BET specific surface area measured by the liquid nitrogen adsorption method was 13 square meters / g. After dissolving the powder in dilute hydrochloric acid, ethyl ether was added, and stearic acid was extracted from the ether layer, separated, dried and measured. 2.6% stearic acid content
Met. Analysis of impurities by X-ray fluorescence showed that Si
O ₂ = 0.04%, Al ₂ O ₃ = 0.08%, Fe ₂ O ₃ =
0.015% and MgO = 0.20%. Using this calcium hydroxide, the following formulation polyvinyl chloride (Molecular weight 700, manufactured by Shin-Etsu Chemical Co., Ltd.) 100 parts by weight Calcium hydroxide 1 part by weight perchlorate (Kyowa Chemical Co., Ltd., perchloric acid type hydrochloride) Talcite: Alkamizer 5) 0.02 parts by weight Zinc stearate 0.5 parts by weight Dipentaerythritol 0.5 parts by weight After mixing, 165 ° C. using an open roll.
For 3 minutes to prepare a sheet having a thickness of about 1 mm. Using this sheet, an oven test and a press thermal stability test were performed. The oven test was performed by placing the sample in a gear oven set at 185 ° C. and measuring the initial and intermediate colorability (visual) and the thermal stability (time until blackening). Press heat resistance test is about 100kg / square meter pressure, temperature 1
Heating and pressurization was performed at 90 ° C., and the time until thermal blackening (thermal stability) was measured in an oxygen-free atmosphere close to the actual molding conditions. Table 1 shows the results.

[0023]

Examples 2 and 3 In the formulation with the PVC of Example 1, sodium perchlorate (NaClO) was used as perchloric acid.
₄₎ 0.02 parts by weight (Example 2) and Table 1 the evaluation results in the case of using by changing the 0.05 parts by weight (Example 3)
Shown in

[0024]

Example 4 To the formulation of Example 1, 0.05 parts by weight of phosphite (bisphenol A tetra-C _12-15 alkyl diphosphite, trade name: MARK 150)
0]) is shown in Table 1.

[0025]

Example 5 Table 1 shows the test results when 0.05 part by weight of β-diketone (dibenzoylmethane) was further added to the formulation of Example 1.

[0026]

Example 6 To the formulation of Example 2, 0.1 part by weight of an antioxidant (tetrakis [methylene-3- [3,5-
Di-t-butyl-4-hydroxyphenyl] propionate] methane, [trade name: Irganox 101
0]) is shown in Table 1.

[0027]

Example 7 In a stainless steel reaction tank having a capacity of 5 liters,
5 mol / l sodium hydroxide aqueous solution (30 ° C)
1.76 liters (1.1 equivalents of alkali to Ca
2) and add 2 mol / l of salted calcium salt with stirring.
2 liters of aqueous solution (30 ° C) in about 2 minutes
I let it. The reactants are heated on a gas stove and heated to about 60 ° C.
After warming, it was maintained for about 20 minutes. After this, 3.5 g of lauri
Approximately 200 milliliters of sodium hydroxide (89% purity)
Torr (approx. 45 ° C) aqueous solution (based on the weight of calcium hydroxide)
(Equivalent to 1% by weight) with stirring.
went. Then, filter, wash, dry (about 120 ° C)
Was ground with an atomizer. The obtained powder is
Dispersion treatment for ropyl alcohol using ultrasonic for about 5 minutes
After that, use Seisin's laser diffraction particle size distribution analyzer.
And the particle size distribution of the secondary particles was measured. As a result, 50%
And 90% of the average secondary particle diameter are 0.98 μm, respectively.
m and 5.48 μm. Primary particle size is measured by SEM
The average was about 0.2 μm. The amount of lauric acid is
Dissolve the sample in hydrochloric acid, extract with ether and dry
As a result of measurement, it was 0.85%. BET specific surface area
It was 10.5 square meters / g. X-ray fluorescence analysis
Fruit, SiO_Two, Al_TwoO_Three= 0.01%, Fe_TwoO _Three= 0.
003%. Other than using this calcium hydroxide
Prepared a PVC sheet with the same formulation as in Example 1, and
Table 1 shows the results of the tests and evaluations conducted in the same manner as in Example 1.
You.

[0028]

Comparative Example 1 Table 1 shows the results of evaluation in the case where no perchlorate was used in the formulation of Example 1.

[0029]

Comparative Example 2 A commercially available high-active calcium hydroxide (BET specific surface area: 7.8 square meters / g, cumulative 50% and 90%
% Of the average secondary particle diameter is 4.04 μm and 9.2, respectively.
7 μm) was used in place of the calcium hydroxide used in Example 1, and the test was performed using the same formulation as in Example 1 except that the perchlorate was omitted. Table 1 shows the evaluation results.

[0030]

Comparative Examples 3 to 5 In the formulation of Example 1, the perchlorate was omitted, and instead of calcium hydroxide, hydrotalcites;
g ₄ Al ₂ (OH) ₁₂ CO ₃ .3H ₂ O (trade name: Alkamizer 1) (Comparative Example 3) and zeolite-A type (trade name: Toyo Builder) (comparison) Example 4) and Table 1 show test results when tribase (tribasic sulfate) was used (Comparative Example 5).

[0031]

[Table 1] Note 1, 2) Lay black paper under the sheet before the heat stability test,
Evaluate the dispersibility and colorability visually. 3) The presence or absence of strong coloring appearing about 20 minutes after the start of the oven heat stability test was visually determined. 4) Visual inspection of the sheet after the press heat resistance test.

[0032]

According to the present invention, large primary particles (low BET specific surface area) which are disadvantages of the conventional calcium hydroxide.
And secondary particles (strong agglomeration), poor dispersion in the resin, and low thermal stability. Furthermore, the prescription of the present invention eliminates metaphase coloring. According to the novel method for producing calcium hydroxide of the present invention, fine particles and highly dispersible calcium hydroxide can be obtained. When this is used for the halogen-containing resin in the formulation of the present invention, it can surpass conventional heat stabilizers. As a result, it has become possible to substitute a toxic, high-performance, low-cost lead-based stabilizer which has been difficult in the past.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/07 C08K 5/07 5/098 5/098 5/103 5/103 5/524 5/524 9 / 04 9/04

Claims (7)

[Claims] (1) 100 parts by weight of a halogen-containing resin, (a)
0.1 to 10 parts by weight of calcium hydroxide (b) surface-treated with 0.1 to 10% by weight of anionic surfactant
0.001 to 1 part by weight of perchlorates (c) 0.01 to
A stabilized halogen-containing resin composition comprising 2 parts by weight of a zinc compound (d) and 0 to 2 parts by weight of a partial ester of a polyhydric alcohol or a polyhydric alcohol. 2. An average of 2 of the cumulative 50% of calcium hydroxide.
The secondary particle diameter is 2 μm or less and the BET specific surface area is 7 to 2
The stabilized halogen-containing resin composition according to claim 1, wherein the composition is in a range of 0 square meters / g. 3. An average 2 of 50% cumulative calcium hydroxide.
Secondary particle size is 1.5 μm or less and BET specific surface area is 1
The stabilized halogen-containing resin composition according to claim 1, wherein the composition is in the range of 0 to 20 square meters / g. 4. A perchlorate represented by the following formula (1): (Wherein, M ²⁺ represents Mg and / or Zn;
A ^n- represents a n (= 1 to 4) valent anion of CO ₃ ^2-, etc., x, y, z and m are each 0.1 <x <0.
5, 0.1 <y <0.5, 0 ≦ z <y, y + nz = x,
2. The stabilized halogen-containing composition according to claim 1, which is a perchloric acid-containing hydrotalcite and / or sodium perchlorate represented by the following formula: 0 ≦ m <3). Resin composition. 5. The method according to claim 1, further comprising:
A stabilized halogen-containing resin composition containing from 1 to 2 parts by weight of a phosphite and / or a β-diketone and / or an antioxidant. 6. The stabilized halogen-containing resin composition according to claim 1, wherein the anionic surfactant in claims 2 and 4 is an alkali metal salt of a higher fatty acid. 7. SiO ₂ is 0.2 wt% or less, Al ₂ O ₃
There 0.1 wt% or less, Fe ₂ O ₃ is not more than 0.05%, and after digestion with the calcined lime at 800 to 1000 ° C. 50 ° C. or more, surface-treated with an anionic surface active agent, water sieve The method for producing calcium hydroxide according to claim 1, wherein: