JPH06219732A - Perchlorate ion-type hydrotalcite compound and halogen-containing resin composition - Google Patents

Abstract

PURPOSE:To obtain the subject compound exhibiting excellent heatresistance and delamination resistance as a stabilizer for a halogen-containing resin by adding a group II a metal salt of perchloric acid to an aqueous slurry of a hydrotalcite compound and drying the produced mixture. CONSTITUTION:An aqueous slurry containing 1mol of a hydrotalcite compound expressed by formula [M<2+> is Mg, Ca, Ni, Cu and/or Zn; 0<x<0.5; 0<=m<=2) is incorporated under agitation with 0.2-1.0mol of a group II a metal salt of perchloric acid. The generation of carbon dioxide gas is extremely slow because the reaction slowly proceeds. Accordingly, the reaction system may be heated at 60-80 deg.C keeping the pH to 7.0-10.0. The reaction time is >=30min. The obtained slurry is dried as it is by evaporating to dryness or by spray-drying. A halogen-containing resin (e.g. polyvinyl chloride) having remarkably improved high-temperature moldability and discoloration resistance and improved delimination resistance can be produced by adding 0.2-10 pts.wt. of the obtained perchlorate ion-type hydrotalcite compound to 100 pts.wt. of a halogen-containing resin.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a perchlorate ion type hydrotalcite compound and a halogen-containing resin composition containing the compound obtained by the method. More specifically, a perchlorate ion-type hydrotalcite compound suitable as a halogen-containing resin stabilizer that remarkably improves heat resistance and color development resistance and improves releasability from a metal surface, and a halogen-containing compound containing the compound. It relates to a resin composition.

[0002]

2. Description of the Related Art Halogen-containing resins are inherently thermally unstable. For example, the decomposition reaction mainly caused by dehydrohalogenation occurs due to heating during molding, temperature rise due to sunlight or the like during use, or ultraviolet rays. Therefore, the mechanical properties of the processed product are deteriorated and the color tone is deteriorated. Heretofore, various stabilizers have been proposed in order to prevent discoloration and deterioration due to these heat and light. For example, Cd-Ba system, Pb
Examples thereof include Ba-Zn-based compounds, Ca-Zn-based compounds, and organic tin-based compounds. Furthermore, various stabilizing aids have been proposed. Examples thereof include polyhydric alcohols, epoxy compounds, organic phosphorus compounds, phenolic antioxidants, β-diketone compounds and the like. However, these stabilizers and stabilizing aids are expensive, and many of them contain heavy metals such as Cd and Pb, which are problematic in terms of toxicity.

In recent years, use of hydrotalcite compounds as a stabilizer for halogen-containing resins has been proposed (Japanese Patent Publication No. 58-46146). The hydrotalcite compounds have excellent halogen-trapping ability, have the advantage that the captured halogen is taken into the structure and inactivated, are stable up to about 400 ° C., and are nontoxic. There is. However, when a hydrotalcite compound is blended with a halogen-containing resin, it also has a drawback that the resin is colored red. Further, in the halogen-containing resin processing industry, there is a strong demand for shortening the molding processing time in order to improve the production efficiency. Save time
Since processing at higher temperatures than usual is required, there is an increasing demand for higher performance of heat stabilizers, that is, heat stability, color resistance, oxidation resistance and the like.

In order to prevent coloring, which is a drawback of hydrotalcite compounds, Zn, Pb and C are used.
A stabilizer using a d-type organic acid salt or an organic tin compound in combination or a resin composition containing the same has been proposed,
Even in these cases, they are not sufficiently satisfactory for processing at high temperatures.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the drawbacks of hydrotalcite compounds, which are stabilizers for halogen-containing resins, and prevents deterioration of color tone during molding and use,
Moreover, molding at high temperature, for example 220 ° C, can be easily performed,
Also provided is a hydrotalcite-based compound capable of improving releasability from a metal surface. Further, the present invention provides a halogen-containing resin composition having the above-mentioned characteristics, which is obtained by blending the above-mentioned hydrotalcite compound.

[0006]

[Means for Solving the Problems]

The present invention provides: (a) Formula (1) M 2 ⁺ _1-x Al (OH) ₂ · (CO ₃ ) _{x / 2} · mH ₂ O (1) [wherein M ²⁺ is Mg, Ca, Represents at least one or more divalent metal ions selected from the group consisting of Ni, Cu and Zn, and x and m each satisfy the following numbers:
0 <x <0.5, 0 ≦ m ≦ 2] of an aqueous slurry containing 1 mol of a hydrotalcite-based compound
A perchlorate ion-type hydrotalcite obtained from the step of adding a metal salt of Group IIa in a ratio of 0.2 to 1.0 mol, and (b) the step of drying the mixed product obtained in the previous step. Provide a similar compound. Further, the present invention provides a halogen-containing resin 10
There is provided a halogen-containing resin composition comprising 0 part by weight and 0.2 to 10 parts by weight of the perchlorate ion type hydrotalcite compound.

The inventors of the present invention added perchloric acid group IIa metal salt or its aqueous solution to an aqueous slurry of hydrotalcite compounds, and evaporated to dryness to give perchlorate ion type hydrotalcites. It was found that the compound was obtained. When the obtained perchlorate ion-type compound is used as a stabilizer for a halogen-containing resin, the deterioration of the color tone during molding and during the period of use of the processed product is remarkably improved, especially at high temperatures, for example 220 ° C. It has been found that it is easy to process, i.e. it retains excellent thermal stability and has improved releasability.

The perchlorate ion type hydrotalcite compound of the present invention is obtained as follows. Stirring of an aqueous slurry of hydrotalcite compounds II of perchloric acid
A metal salt of group a is added to proceed the ion exchange reaction. The pH at this time is 7.0 to 10.0. Since the ion exchange reaction proceeds gradually, it is preferable to heat the aqueous slurry to 60 to 80 ° C. to accelerate the reaction. Since the reaction rate of generation of carbon dioxide gas at this time was slow, it was barely visible as fine foaming. Alternatively, an aqueous solution of a metal salt of Group IIa of perchloric acid may be prepared, and a powder or aqueous slurry of a hydrotalcite compound may be added thereto. Examples of the Group IIa metal include Mg, Ca, Sr, Ba and the like.

In advancing the above ion exchange reaction, a hydrotalcite compound is used as a higher fatty acid alkali metal salt such as stearic acid or oleic acid alkali metal salt, or higher alkyl allyl sulfone such as lauryl benzene sulfonic acid alkali metal salt. It is also possible to use a product surface-treated with a surfactant such as an acid alkali metal salt.

In the above reaction, since the reaction pH is 7.0 to 10.0, the ion exchange reaction can proceed without destroying the brucite structure which is the basis of the hydrotalcite structure. On the other hand, when the ion exchange reaction is carried out using perchloric acid, the reaction pH is as low as 1.5 to 2.5, so that the brucite structure is partially destroyed. The amount of the metal salt of Group IIa of perchloric acid added is 0.2 to 1.0 mol per 1 mol of the hydrotalcite compound, and when less than 0.2 mol, when applied to the halogen-containing resin, It has no effect on the color tone during molding and use, and when it is more than 1.0 mol, it tends to deteriorate the halogen-containing resin. In addition, the risk of explosion due to the oxidizing action of perchloric acid increases, which is not preferable.

The method for producing the perchlorate ion type hydrotalcite compound of the present invention will be described in more detail. (1) Hydrotalcite compounds are disclosed in Japanese Patent Publication No. 46-
2280, Japanese Patent Publication No. 47-32198, Japanese Patent Publication No. 50-30039, Japanese Patent Publication No. 48-29477, Japanese Patent Publication No. 51-29129, Japanese Patent Publication No. 58-4.
It is a dried product or an aqueous slurry of a CO ₃ ionic hydrotalcite compound obtained by the method disclosed in Japanese Patent No. 6146 or the like. (2) A CO ₃ ionic hydrotalcite compound is made into an aqueous slurry, and a predetermined amount of a Group IIa metal salt of perchloric acid is added with stirring. The perchlorate may be added as an aqueous solution. (3) Since the ion exchange reaction gradually progresses after the addition, the generation rate of carbon dioxide is extremely slow. You may heat at 60-80 degreeC in order to accelerate | stimulate reaction. The ion exchange reaction is carried out on the weak alkaline side at pH 7 to 10, and the reaction time is 30
Minutes or more, preferably 60 minutes or more. (4) The obtained slurry is directly evaporated to dryness or spray-dried.

The obtained perchlorate ion-type hydrotalcite compound does not erode the brucite layer, which is the basic structure of the crystal, unlike the case where perchloric acid which is a strong acid is used. The reaction mechanism is not clear, but it is presumed to be as follows. For example, when a predetermined amount of Ba (ClO ₄ ) aqueous solution is added to CO ₃ ion type hydrotalcites, Ba
The solubility of CO ₃ is very small compared to its perchlorate, absorption Thus the CO ₃ ion type hydrotalcite CO ₃ ion is withdrawn gradually, in place of with perchlorate ion hydrotalcite It is thought to be done.
When the obtained product was examined by an X-ray diffractometer, both CO ₃ ion type hydrotalcites and ClO ₄ ion type hydrotalcites were present. Further, when the amount of Ba (ClO ₄ ) was increased, the amount of ClO ₄ ionic hydrotalcites increased. In addition, other metal salts as perchlorate, a raw material for the production of perchlorate ion-type hydrotalcite compounds,
For example, perchlorates such as Al, Fe, Cu and Zn can be applied.

The halogen-containing resin containing the perchlorate ion type hydrotalcite compound of the present invention in a predetermined amount has remarkably improved high temperature moldability and color development resistance, and also has improved releasability. Examples of the halogen-containing resin used in the present invention include the following. Polyvinyl chloride, polyvinyl bromide, polyvinyl fluoride, polyvinylidene chloride, chlorinated polyethylene, chlorinated polypropylene, brominated polyethylene, chlorinated rubber, vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, chlorinated Vinyl-propylene copolymer, vinyl chloride-styrene copolymer, vinyl chloride-
Isobutylene copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-styrene-acrylonitrile copolymer, vinyl chloride-butadiene copolymer, vinyl chloride-
Chlorinated propylene copolymer, vinyl chloride-vinylidene chloride-vinyl acetate terpolymer, vinyl chloride-maleic acid ester copolymer, vinyl chloride-methacrylic acid copolymer, vinyl chloride-methacrylic acid ester copolymer, Halogen-containing resins such as vinyl chloride-acrylonitrile copolymer, internally plasticized polyvinyl chloride and the above halogen-containing resins and α-olefin copolymers such as polyethylene and polypropylene, polyolefins such as ethylene-propylene copolymer and copolymers thereof. Polymer, polystyrene, acrylic resin, copolymer of styrene and other monomer, polystyrene, acrylic resin, copolymer of styrene and other monomer, acrylonitrile-butadiene-styrene copolymer, acrylic acid Ester-butadiene-styrene copolymer, methacrylic acid ester - butadiene - blend of styrene copolymer.

The perchlorate ion type hydrotalcite compound of the present invention may be used as a stabilizer in combination with various conventionally known additives. As various additives, for example, nitrogen-containing non-metal stabilizers, organotin stabilizers, organic acid metal salts, metal oxides, metal hydroxides, basic inorganic acid salts of metals, β-diketones, Epoxy stabilizer, plasticizer, antioxidant, light stabilizer, ultraviolet absorber, nucleating agent, filler,
Examples include organic phosphite, antistatic agents, antifogging agents, antiplateout agents, lubricants, fluorescent agents, fungicides, bactericides, flame retardants, photodegradants, processing aids, release agents, pigments, etc. To be done. The present invention will be described in more detail based on the following examples. In each example, parts and% mean parts by weight and% by weight, respectively, unless otherwise specified.

Example 1 CO ₃ ion type hydrotalcite compound (Japanese Examined Patent Publication 5)
No. 8-46146) was prepared into a 10% aqueous slurry, and 500 g thereof was placed in a beaker having a volume of 1 liter, heated to 80 ° C., and forced stirring was carried out.
To this, a powder or an aqueous solution of magnesium salt, calcium salt or barium salt of perchloric acid was added in a predetermined amount in about 1 minute so that the compounding ratio in Table 1 was obtained. Then, stirring was continued for 60 minutes. The pH from the time of addition to the end is 7.5 to 9.5.
The generation of carbon dioxide gas was hardly observed. The obtained slurry was evaporated to dryness, pulverized, and then filtered through a 200-mesh wire net to give a test sample.

When subjected to powder X-ray diffraction, the sample was a mixture of a perchlorate ion type hydrotalcite compound and a carbonate ion type hydrotalcite compound.
The amount of ion exchange was determined by the X-ray diffraction line intensity of the perchlorate ion type hydrotalcite compound (position 2θ = 19.5).
(Around °) is defined as a, and the diffraction line intensity of the carbonate ion-type hydrotalcite compound (position 2θ = around 11.6 °) is defined as b.
And displayed as a / b. The results are shown in Table 1.

Comparative Example 1 A carbonate ion type hydrotalcite compound itself was used as a sample R-1. Samples obtained in the same manner as in Example 1 except that perchloric acid was used instead of the group IIa metal salt of perchloric acid were designated as samples R-2 and R-3. Further, a mixture of a carbonate ion type hydrotalcite compound and a Group IIa metal salt of perchloric acid in powder form was used as Samples R-4 and R-5.
The X-ray diffraction line intensity of each sample was displayed in the same manner as in Example 1. The results are shown in Table 1.

Table 1 Hydrotalcite Perchloric acid Perchloric acid Diffraction intensity Compounds Compound Salt Salt addition amount a / b Example 1 S-1 Mg ₃ ZnAl ₂ (OH) ₁₂ CO ₃ Mg (ClO ₄ ) ₂ 0.6 Mol 1.0 .4H ₂ O .6H ₂ O S-2 Mg ₄ ZnA _l2 (OH) ₁₂ CO ₃ Ba (ClO ₄ ) ₂ 1.0 mol 3.8 .4H ₂ O .3H ₂ O S-3 Mg _{5.8 Ni 0.2 Al 2 (OH)} 16 Ca (ClO 4) 2 0.3 mol _{0.3 CO 3 · 5H 2 O S} -4 Mg 5.9 Ca 0.1 Al 2 (OH) 16 Mg (ClO 4) 2 0.6 Molar 1.2 CO ₃ .5H ₂ O Comparative Example 1 R-1 Mg ₄ Al ₂ (OH) ₁₂ CO ₃ − − 0 ・ 4H ₂ O R-2 Mg ₃ ZnAl ₂ (OH) ₁₂ CO ₃ HClO ₄ 2. 0 mol 7.5 ・ 4H ₂ O R-3 Mg ₃ ZnAl ₂ (OH) ₁₂ CO ₃ HClO ₄ 1.2 mol 1.5 ・ 4H ₂ O R-4 Mg ₆ Al ₂ (OH) ₁₆ CO Ba (ClO ₄ ) ₂ 0.6 mol 0 .5H ₂ O R-5 Mg ₄ Al ₂ (OH) ₁₂ CO ₃ Mg (ClO ₄ ) ₂ 0.6 mol 0 .4H ₂ O .6H ₂ O

Example 2 The samples obtained in Example 1 and Comparative Example 1 were blended with a polyvinyl chloride resin at the following blending ratios to obtain thermal stability, color fastness and
The peelability and heat resistance during use were evaluated. Polyvinyl chloride (polymerization degree 1300) 100 parts DOP 50 parts Barium stearate 0.5 parts Zinc stearate 0.3 parts Sample (prototype of Example 1 or Comparative Example 1) 2.0 parts

The above composition was placed on an 8-inch roll at 170 ° C.
The mixture was kneaded for 5 minutes to prepare a test roll sheet having a thickness of 1.0 mm. The obtained roll sheet was used as a test piece having a length and width of 4 cm, placed on a stainless plate, and a heat resistance test was carried out in a 220 ° C. gear oven to examine the color developability and the releasability before blackening. The test results are shown in Table 2.

Test method: The releasability of all the samples becomes very poor as the heat resistance test progresses to blackening. Therefore, the stainless steel plate on which the sample immediately before blackening was placed was taken out, cooled, and then peeled off with a bamboo stick to evaluate its peelability. The heat resistance was evaluated by the time (minutes) until blackening or the generation of black spots. The color developability was evaluated by visually observing the degree of coloring 10 minutes after heating. The heat resistance during use is such that the roll sheet test piece is hung in a gear oven at 120 ° C, and heat resistance (the number of days until blackening or black spots) and color development (color tone on the second day in a 120 ° C gear oven)
Was evaluated.

Table 2 220 ° C. blackening Peelability 220 ° C. 120 ° C. blackening 120 ° C. Sample No. Time (minutes) 10 minutes Color tone Time (day) 2 days Color tone S-1 40 ◎ Light yellow 24 Light yellow S-2 35 ◎ Colorless 20 Light light yellow S-3 40 ○ Light yellow green 21 Light yellow green S-4 40 ◎ Pale yellow 23 Pale yellow brown R-1 40 △ Reddish brown 12 Reddish brown R-2 15 △ Pale yellow 12 * Pale yellow R-3 25 * ○ Pale yellow 16 * Pale yellow R-4 30 ※ ○ Pale yellow 17 ※ Red yellow R -5 30 * ○ Yellowish brown 17 * Red-yellow Note: Peelability ◎: Very good, ○: Good, △: Inferior blackening * Marks are black spots.

Example 3 Ba-Z usually used in a halogen-containing resin composition
When the n-type composite stabilizer and the perchlorate ion type hydrotalcite compound of the present invention are used in combination, a synergistic effect is recognized.
The following experiment was conducted to clarify this synergistic effect.
The resin composition having the following composition was rolled by an 8-inch roll at 160 ° C. for 1
The mixture was kneaded for 0 minutes to prepare a test roll sheet having a thickness of 0.7 mm. Each property of this sheet was evaluated by the test method of Example 2. Polyvinyl chloride (Polymerization degree 700) 50 parts ABS 50 parts Ba-Zn-based composite stabilizer (manufactured by ADEKA ARGUS CORPORATION, "R"
UP-14 ″) 2 parts Sample (prototype of Example 1 or Comparative Example 1) The blending amount is shown in Table 3.

Table 3 Compounding amount 220 ° C. Blackening 220 ° C. 120 ° C. Blackening 120 ° C. Sample No. (Part) Time (minutes) 10 minutes Color tone (day) 2 days Color tone S-1 570 Light yellow 28 Colorless S-2 0.350 Colorless 19 Colorless S-3 0.5 55 Light green 20 Light green S- 4 1 60 Colorless 20 Colorless 0 40 Colorless 12 Colorless R-1 0.5 45 Brown 13 Yellow-brown R-4 0.5 45 * Yellow-brown 17 * Light yellow Note: * indicates black dots.

[0025]

INDUSTRIAL APPLICABILITY According to the present invention, as a halogen-containing resin stabilizer, a perchlorate ion type hydrotalcite compound showing excellent heat resistance, color development resistance and peeling property, and the above-mentioned compound containing the hydrotalcite compound are blended. Provided is a halogen-containing resin composition exhibiting characteristics.

[Procedure amendment]

[Submission date] July 9, 1993

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The perchlorate ion type hydrotalcite compound of the present invention is obtained as follows. While stirring an aqueous slurry of hydrotalcite-based compound, I
A metal salt of Group Ia is added in the form of powder or an aqueous solution to proceed the ion exchange reaction. The pH at this time is 7.0 to 10.0. The aqueous slurry may be heated to 60-80 ° C to accelerate the reaction. Since the reaction rate of generation of carbon dioxide gas at this time was slow, it was barely visible as fine foaming. Alternatively, an aqueous solution of a metal salt of Group IIa of perchloric acid may be prepared, and a powder or aqueous slurry of a hydrotalcite compound may be added thereto. As the Group IIa metal, M
Examples include g, Ca, Sr, Ba and the like.

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The method for producing the perchlorate ion type hydrotalcite-classified compound of the present invention will be described in more detail. (1) Hydrotalcite compounds are disclosed in Japanese Patent Publication No. 46-
2280, Japanese Patent Publication No. 47-32198, Japanese Patent Publication No. 50-30039, Japanese Patent Publication No. 48-29477, Japanese Patent Publication No. 51-29129, Japanese Patent Publication No. 58-4.
It is a dried product or an aqueous slurry of a CO ₃ ion type hydrotalcite compound obtained by the method disclosed in Japanese Patent No. 6146 or the like. (2) A CO ₃ ion type hydrotalcite compound is made into an aqueous slurry, and a predetermined amount of a Group IIa metal salt of perchloric acid is added with stirring. The perchlorate may be added as an aqueous solution. (3) Since the ion exchange reaction gradually progresses after the addition, the generation rate of carbon dioxide is extremely slow. You may heat at 60-80 degreeC in order to accelerate | stimulate reaction. Perchloric acid IIa
After the addition of the metal salt, the pH is on the weak alkaline side of pH 7-10. (4) The obtained slurry is directly evaporated to dryness or spray-dried.

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The obtained perchlorate ion type hydrotalcite compound is considered to have no erosion of the brucite layer which constitutes the basic structure of the crystal, unlike the case where perchloric acid which is a strong acid is used. The reaction mechanism is not clear, but it is presumed to be as follows. For example CO ₃ ion type hydrotalcite to a predetermined amount of Ba _{(ClO 4)} The addition of ₂ aqueous solution, very small, and therefore CO ₃ ion-containing hydrotalcite solubility of BaCO ₃ is compared to its perchlorate It is considered that CO ₃ ions are gradually extracted from the compounds and the perchlorate ions are absorbed by the hydrotalcites instead. When the obtained product was examined by an X-ray diffractometer, C
Both O ₃ ion type hydrotalcites and ClO ₄ ion type hydrotalcites were present. Also, Ba (C
Increasing the amount of 10 ₄ ) increased the amount of ClO ₄ ionic hydrotalcites. Then, depending on the type of perchlorate used, the hygroscopicity of the obtained perchlorate ion type hydrotalcite compound is suppressed to a low level. Especially Ca
Those reacted with (ClO ₄ ) ₂ have little hygroscopicity. Further, as a raw material for producing perchlorate ion type hydrotalcite compounds, other metal salts such as Al, Fe and C are used as perchlorates.
Perchlorates such as u and Zn can also be applied. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 15, 1993

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[0006]

Means for Solving the Problems The present invention provides (a) formula (1) M ²⁺ _1-x Al _x (OH) ₂ · (CO ₃ ) _{x / 2} · mH ₂ O (1) [wherein M ²⁺ is Mg, Ca, Ni, Cu and Zn
A hydrotalcite compound of 0 <x <0.5, 0 ≦ m ≦ 2, each of which represents at least one divalent metal ion selected from the group consisting of A step of adding a metal salt of Group IIa of perchloric acid at a ratio of 0.2 to 1.0 mol to an aqueous slurry containing 1 mol; (b) a step of drying the mixed product obtained in the previous step Provided is a perchlorate ion type hydrotalcite compound obtained from Further, the present invention provides a halogen-containing resin 10
There is provided a halogen-containing resin composition comprising 0 part by weight and 0.2 to 10 parts by weight of the perchlorate ion type hydrotalcite compound. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 20, 1993

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[0018]

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Example 2 The samples obtained in Example 1 and Comparative Example 1 were blended with a polyvinyl chloride resin at the following blending ratios to obtain thermal stability, color fastness and
The peelability and heat resistance during use were evaluated. Polyvinyl chloride (polymerization degree 1300) 100 parts DOP 50 parts Barium stearate 0.5 parts Zinc stearate 0.3 parts Epoxidized oil 3.0 parts Sample (prototype of Example 1 or Comparative Example 1) 2.0 Department

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[0022]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location C08L 27/06 KGL 9166-4J

Claims (2)

[Claims] 1. A perchlorate ion type hydrotalcite compound obtained from steps (a) and (b), (a) formula (1) M 2 ⁺ _{1 -x} Al (OH) _2. (CO ₃ ) _{X / 2} · mH ₂ O (1) [wherein, M ²⁺ represents at least one divalent metal ion selected from the group consisting of Mg, Ca, Ni, Cu and Zn, and x and m Respectively satisfy the following numbers,
0 <x <0.5, 0 ≦ m ≦ 2] of an aqueous slurry containing 1 mol of a hydrotalcite-based compound
Adding a metal salt of Group IIa in a ratio of 0.2 to 1.0 mol; (b) drying the mixed product obtained in the previous step. 2. 100 parts by weight of a halogen-containing resin and 1.
A halogen-containing resin composition comprising 0.2 to 10 parts by weight of the above-mentioned perchlorate ion type hydrotalcite compound.