JPS6241980B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for stabilizing a resin composition containing an acrylonitrile butadiene styrene resin (hereinafter referred to as ABS) and a vinyl chloride resin (hereinafter referred to as PVC). ABS is suitable for injection molding products due to various conditions such as cost, moldability, and physical properties, and is often used as a material for electrical components. Recently, regulations on the flame retardant ratio of materials used have become more stringent in order to prevent fire accidents in household electrical appliances. Unlike halogen-containing resins, ABS has the disadvantage of being easily flammable. In order to make ABS flame retardant, it is necessary to add flame retardants such as antimony trioxide, halogen-containing compounds, and phosphorous compounds to ABS, or add DVC or chlorine to ABS. Methods such as blending chlorine-containing resins such as DVC, chlorinated polyethylene, and polyvinylidene chloride must be taken.
When adding flame retardants to ABS, there are problems with the toxicity of the flame retardant and the generation of toxic gases when burned, so methods of blending ABS with less toxic chlorine-containing resins have been widely researched. ing. When blending PVC with ABS to make it flame retardant, the higher the proportion of PVC in the blend, the higher the flame retardant effect, but the lower the moldability, thermal stability and physical properties; Flame retardant effect decreases. In order to maintain a good balance of moldability, thermal stability, physical properties, and flame retardant effect.
Preferably, the ratio of ABS to PVC is approximately 1:1 by weight. In order to injection mold a resin composition with a ratio of approximately 1:1 of ABS and PVC, it is necessary to raise the molding temperature to a high temperature of 200°C or higher, and this resin composition is extremely susceptible to thermal deterioration, which has been a major drawback. In this sense, the development of an excellent stabilizer that prevents thermal deterioration has been awaited. The inventors found that the weight ratio of ABS and PVC was approximately 4:6.
As a result of intensive research on a method for thermally stabilizing a resin composition with a ratio of ~6:4, it was found that 0.5 to 5 parts by weight of an organotin maleate compound and 0.3 to 5 parts by weight of an organotin sulfur-containing compound per 100 parts by weight of the resin composition. parts, but a total of 1.5 to 8 parts by weight of both, and 0.05 parts of magnesium hydroxide
The present invention was completed by discovering that excellent thermal stability can be provided by adding ~1.5 parts by weight. The organotin maleate compounds used in carrying out the present invention have general formulas (1) and (2). [In formulas (1) and (2), R ¹ is an alkyl group, an alkenyl group, an aralkyl group, or an alkoxyalkyl group,
R ² is an alkyl group having 1 to 12 carbon atoms, A is oxygen or a group represented by -OCOCH=CHCOO-, k is 0 or 1, and l is an integer of 1 to 10. ] It is indicated by. Organotin sulfur-containing compounds have general formulas (3) and (4) [In formulas (3) and (4), R ³ is an alkyl group, alkenyl group, aralkyl group, alkoxyalkyl group, R ⁴
is an alkyl group having 1 to 12 carbon atoms, B is oxygen, B' is sulfur or a group represented by -S(CH ₂ ) _p COO-,
p is an integer of 1 or 2, X is R ⁴ or -S
(CH ₂ ) _p A group represented by COOR ³ , m is 0 or 1,
n represents an integer of 1 to 10. ] It is indicated by. Needless to say, there is a difference between PVC and conventional PVC.
It has been known that organotin maleate compounds and organotin sulfur-containing compounds also provide excellent thermal stabilization effects to resin compositions containing ABS. However
Under severe processing conditions during the injection molding process of PVC-ABS-containing resin compositions, molded products tend to become discolored due to lack of thermal stability or frictional heat due to lack of fluidity. Increasing the amount of the stabilizer used to compensate for thermal stability not only increases costs but also causes damage by deteriorating the physical properties of the molded product. For this reason, there is a demand for stabilizers with even better thermal stabilization effects. According to the research of the present inventors, the above general formulas (1) and (2)
At least one kind selected from the organotin maleate compounds represented by
Thermal stability was improved by using the seeds together with alkaline earth metal hydroxides such as calcium, barium, magnesium, and strontium. Among metal hydroxides, magnesium hydroxide was found to have a significant thermal stabilizing effect. In particular, the present invention provides extremely excellent thermal stability for long-term heating in an air-blocked atmosphere such as in injection molding, and the combination of both the organotin maleate compound and the organotin sulfur-containing compound alone is not sufficient. It has a synergistic effect that is impossible to achieve. Note that even if an alkaline earth metal oxide is used in combination with both the organotin maleate compound and the organotin sulfur-containing compound, a slight thermal stabilizing effect can be expected. Further, when an alkaline earth metal soap is used in combination with both the organotin maleate compound and the organotin sulfur-containing compound, almost no thermal stabilizing effect is observed. Furthermore, in the present invention, 0.5 to 5 parts by weight of the organotin maleate compound, preferably 1 to 4 parts by weight, and the organotin sulfur-containing compound are added to 100 parts by weight of the resin composition.
0.3 to 5 parts by weight, preferably 0.3 to 3 parts by weight, 0.05 to 1.5 parts by weight of magnesium hydroxide, preferably 0.1
When used together in a proportion of ~1 part by weight, a synergistic effect provides an excellent thermal stabilizing effect. Even if they are used in combination at a ratio outside the range of the present invention, the effect will be diminished. When implementing the stabilization method according to the present invention, the organotin maleate compound and the organotin sulfur-containing compound are added in a total of 1.5 to 1.5 parts by weight per 100 parts by weight of the resin composition.
Add 8 parts by weight and 0.05 to 1.5 parts by weight of magnesium hydroxide. If the total amount of the organotin maleate compound and the organotin sulfur-containing compound is less than 1.5 parts by weight, the thermal stabilizing effect will be small, and if it exceeds 8 parts by weight, it is economically disadvantageous. The amount is preferably 2 to 5 parts by weight from the thermal stabilizing effect and economical standpoint. Examples of the organotin maleate compound represented by the general formula (1) used in the present invention include the following. Dimethyltin bis(ethyl maleate), dimethyltin bis(isopropyl maleate), dimethyltin bis(butyl maleate), dimethyltin bis(hexyl maleate), dimethyltin bis(octyl maleate), dimethyltin bis(isopropyl maleate) octyl maleate), dimethyltin bis(2-ethylhexyl maleate), dimethyltin bis(decyl maleate), dimethyltin bis(dodecyl maleate), dimethyltin bis(tridecyl maleate), dimethyltin bis(octadecyl maleate) , dimethyltin bis(oleyl maleate), dimethyltin bis(benzyl maleate), dimethyltin bis(cyclohexyl maleate), dimethyltin bis(methoxybutyl maleate), dibutyltin bis(methyl maleate), dibutyltin bis (ethyl maleate), dibutyltin bis(propyl maleate), dibutyltin bis(isopropyl maleate), dibutyltin bis(butyl maleate), dibutyltin bis(amyl maleate), dibutyltin bis(hexyl maleate), dibutyl Tin bis(heptyl maleate), dibutyltin bis(octyl maleate), dibutyltin bis(isooctyl maleate), dibutyltin bis(2-ethylhexyl maleate), dibutyltin bis(nonyl maleate), dibutyltin bis(decyl maleate) ), dibutyltin bis(dodecyl maleate),
Dibutyltin bis(tridecyl maleate), dibutyltin bis(octadecyl maleate), dibutyltin bis(allyl maleate), dibutyltin bis(oleyl maleate), dibutyltin bis(benzyl maleate), dibutyltin bis( cyclohexyl maleate), dibutyltin bis(methoxybutyl maleate), dioctyltin bis(ethyl maleate), dioctyltin bis(propyl maleate), dioctyltin bis(isopropyl maleate), dioctyltin bis(butyl maleate) , dioctyltin bis(hexyl maleate), dioctyltin bis(octyl maleate), dioctyltin bis(isooctyl maleate), dioctyltin bis(2-ethylhexyl maleate), dioctyltin bis(decyl maleate), dioctyltin bis(decyl maleate) (dodecyl maleate), dioctyltin bis(tridecyl maleate), dioctyltin bis(octadecyl maleate), dioctyltin bis(oleyl maleate), dioctyltin bis(benzyl maleate), dioctyltin bis(cyclohexyl maleate) ), dioctyltin bis(methoxybutyl maleate), dilauryltin bis(ethyl maleate), dilauryltin bis(isopropyl maleate), dilauryltin bis(butyl maleate), dilauryltin bis(hexyl maleate), dilauryltin Bis(octyl maleate),
dilauryltin bis(isooctyl maleate),
Dilauryltin bis(2-ethylhexyl maleate), dilauryltin bis(decyl maleate), dilauryltin bis(dodecyl maleate), dilauryltin bis(tridecyl maleate), dilauryltin bis(octadecyl maleate), dilauryltin bis( oleyl maleate), dilauryltin bis(benzyl maleate), dilauryltin bis(cyclohexyl maleate), dilauryltin bis(methoxybutyl maleate), bis(dimethyltin ethyl maleate) maleate, bis(dimethyltin isopropyl maleate) ) maleate, bis(dimethyltin butyl maleate) maleate, bis(dimethyltin hexyl maleate) maleate, bis(dimethyltin octyl maleate) maleate, bis(dimethyltin isooctyl maleate) maleate, bis(dimethyltin 2- Ethylhexyl maleate) maleate, bis(dimethyltin decyl maleate) maleate, bis(dimethyltin dodecyl maleate) maleate, bis(dimethyltin tridecyl maleate) maleate, bis(dimethyltin octadecyl maleate) maleate, bis(dimethyltin oleyl) maleate) maleate, bis(dimethyltin benzyl maleate) maleate, bis(dimethyltin cyclohexyl maleate) maleate, bis(dimethyltin methoxybutyl maleate) maleate, bis(dibutyltin methyl maleate) maleate, bis(dibutyltin Ethyl maleate) maleate, bis(dibutyltinpropyl maleate) maleate, bis(dibutyltin isopropyl maleate)
Maleate, bis(dibutyltin butyl maleate) maleate, bis(dibutyltin amyl maleate) maleate, bis(dibutyltin hexyl maleate) maleate, bis(dibutyltin heptyl maleate) maleate, bis(dibutyltin octyl maleate) maleate, Bis(dibutyltin isooctyl maleate) maleate, bis(dibutyltin 2-ethylhexyl maleate) maleate, bis(dibutyltin nonyl maleate)
Maleate, bis(dibutyltin decyl maleate) maleate, bis(dibutyltin dodecyl maleate) maleate, bis(dibutyltin tridecyl maleate) maleate, bis(dibutyltin octadecyl maleate) maleate, bis(dibutyltin allyl maleate) maleate , bis(dibutyltin oleyl maleate) maleate, bis(dibutyltin benzyl maleate) maleate,
Bis(dibutyltin cyclohexyl maleate) maleate, bis(dibutyltin methoxybutyl maleate) maleate, bis(dioctyltin ethyl maleate) maleate, bis(dioctyltin propyl maleate) maleate, bis(dioctyltin isopropyl maleate) maleate , bis(dioctyltinbutyl maleate) maleate,
Bis(dioctyltin hexyl maleate) maleate, bis(dioctyltin octyl maleate)
maleate, bis(dioctyltin isooctyl maleate) maleate, bis(dioctyltin 2-
Ethylhexyl maleate) maleate, bis(dioctyltindecyl maleate) maleate,
Bis(dioctyltin dodecyl maleate) maleate, bis(dioctyltin tridecyl maleate) maleate, bis(dioctyltin octadecyl maleate) maleate, bis(dioctyltin oleyl maleate) maleate, bis(dioctyltin benzyl maleate) maleate , bis(dioctyltin cyclohexyl maleate) maleate, bis(dioctyltin methoxybutyl maleate) maleate, bis(dilauryltin ethyl maleate) maleate, bis(dilauryltin isopropyl maleate) maleate, bis(dilauryltin butyl maleate) Maleate, bis(dilauryltin hexyl maleate) maleate, bis(dilauryltin octyl maleate) maleate, bis(dilauryltin isooctyl maleate) maleate, bis(dilauryltin 2-ethylhexyl maleate) maleate, bis(dilauryltin decyl maleate) ) maleate, bis(dilauryltin dodecyl maleate) maleate, bis(dilauryltin tridecyl maleate)
Maleate, bis(dilauryltin octadecyl maleate) maleate, bis(dilauryltin oleyl maleate) maleate, bis(dilauryltin benzyl maleate) maleate, bis(dilauryltin cyclohexyl maleate) maleate, bis(dilauryltin methoxybutyl maleate) ) maleate, bis(dimethyltin butyl maleate) oxide, bis(dimethyltin isooctyl maleate) oxide, bis(dimethyltin benzyl maleate) oxide, bis(dibutyltin butyl maleate) oxide, bis(dibutyltin isooctyl) maleate) oxide, bis(dibutyltinbenzyl maleate) oxide,
Bis(dioctyltin butyl maleate) oxide, bis(dioctyltin isooctyl maleate) oxide, bis(dioctyltin benzyl maleate) oxide, bis(dilauryltin butyl maleate) oxide, bis(dilauryltin isooctyl maleate) oxide, bis(dilauryltin benzyl maleate) oxide, etc., and preferred examples include dibutyltin bis(butyl maleate), dibutyltin bis(isooctyl maleate), dibutyltin bis(2-ethylhexyl maleate), and dibutyltin bis(2-ethylhexyl maleate). Tin bis(tridecyl maleate), dibutyltin bis(octadecyl maleate), dibutyltin bis(oleyl maleate), dibutyltin bis(benzyl maleate), dibutyltin bis(cyclohexyl maleate), dioctyltin bis(butyl) dioctyltin bis(isooctyl maleate), dioctyltin bis(2-ethylhexyl maleate), dioctyltin bis(tridecyl maleate), dioctyltin bis(octadecyl maleate), dioctyltin bis(oleyl maleate) ate), dioctyltin bis(benzyl maleate), dioctyltin bis(cyclohexyl maleate), bis(dibutyltin butyl maleate) maleate, bis(dibutyltin isooctyl maleate) maleate,
Bis(dibutyltin 2-ethylhexyl maleate) maleate, bis(dibutyltin tridecyl maleate) maleate, bis(dibutyltin octadecyl maleate) maleate, bis(dibutyltin oleyl maleate) maleate, bis(dibutyltin benzyl maleate) ) maleate, bis(dibutyltin cyclohexyl maleate) maleate, bis(dioctyltin butyl maleate) maleate, bis(dioctyltin isooctyl maleate) maleate, bis(dioctyltin 2-ethylhexyl maleate) maleate, bis(dioctyltin tridecyl maleate) maleate,
Bis(dioctyltin octadecyl maleate) maleate, bis(dioctyltin oleyl maleate) maleate, bis(dioctyltin benzyl maleate) maleate, bis(dioctyltin cyclohexyl maleate) maleate, bis(dibutyltin butyl maleate) oxide, Bis(dibutyltin benzyl maleate) oxide, bis(dioctyltin butyl maleate) oxide,
Bis(dioctyltin benzyl maleate) oxide and the like can be mentioned. Examples of the organotin maleate compound represented by the general formula (2) include the following. These include dimethyltin maleate, dibutyltin maleate, dioctyltin maleate, dilauryltin maleate, and polymers thereof. Examples of the organotin sulfur-containing compound represented by the general formula (3) include the following. Monomethyltin tris (isooctylmercaptoacetate), monomethyltin tris (2-ethylhexylmercaptoacetate), monomethyltin tris (octadecylmercaptoacetate),
Monomethyltin tris (oleyl mercaptoacetate), monomethyltin tris (methoxybutyl mercaptoacetate), monobutyltin tris (butyl mercaptoacetate), monobutyltin tris (octyl mercaptoacetate), monobutyltin tris (isooctyl mercaptoacetate), monobutyltin tris (2-ethylhexylmercaptoacetate), monobutyltin tris (octadecylmercaptoacetate), monobutyltin tris (oleylmercaptoacetate),
Monobutyltin tris (benzylmercaptoacetate), monobutyltin tris (methoxybutylmercaptoacetate), monooctyltin tris (butylmercaptoacetate), monooctyltin tris (octylmercaptoacetate), monooctyltin tris (isooctylmercaptoacetate), Monooctyltin tris(2-ethylhexylmercaptoacetate), monooctyltin tris(methoxybutylmercaptoacetate), dimethyltin bis(isooctylmercaptoacetate), dimethyltin bis(2-ethylhexylmercaptoacetate), dimethyltin bis(octadecylmercaptoacetate) dimethyltin bis(oleyl mercaptoacetate), dimethyltin bis(methoxybutyl mercaptoacetate), dibutyltin bis(butyl mercaptoacetate), dibutyltin bis(octyl mercaptoacetate), dibutyltin bis(isooctyl mercaptoacetate), Dibutyltin bis (2-ethylhexylmercaptoacetate), dibutyltin bis (octadecyl mercaptoacetate), dibutyltin bis (oleyl mercaptoacetate), dibutyltin bis (benzyl mercaptoacetate), dibutyltin bis (cyclohexyl mercaptoacetate), dibutyltin bis (methoxybutylmercaptoacetate), dioctyltin bis(butylmercaptoacetate), dioctyltin bis(octylmercaptoacetate), dioctyltin bis(isooctylmercaptoacetate), dioctyltin bis(2-ethylhexylmercaptoacetate), dioctyltin bismethoxy butyl mercaptoacetate), bis(dimethyltin isooctylmercaptoacetate) oxide, bis(dimethyltin 2-ethylhexylmercaptoacetate) oxide, bis(dibutyltin isooctylmercaptoacetate) oxide, bis(dibutyltin 2-ethylhexylmercaptoacetate) oxide , bis(dioctyltin isooctylmercaptoacetate) oxide, bis(dioctyltin 2-ethylhexylmercaptoacetate) oxide, monomethyltin tris(isooctyl 3-mercaptopropionate), monomethyltin tris(2-ethylhexyl 3-mercaptopropionate) ), monomethyltin tris (octadecyl 3-mercaptopropionate), monomethyltin tris (oleyl 3-mercaptopropionate), monomethyltin tris (methoxybutyl 3-mercaptopropionate), monobutyltin tris (butyl 3-mercaptopropionate) monobutyltin tris (octyl 3-mercaptopropionate), monobutyltin tris (isooctyl 3-mercaptopropionate), monobutyltin tris (2-ethylhexyl 3-mercaptopropionate), monobutyltin tris (2-ethylhexyl 3-mercaptopropionate), octadecyl 3-mercaptopropionate), monobutyltin tris (oleyl 3
-mercaptopropionate), monobutyltin tris (benzyl 3-mercaptopropionate), monobutyltin tris (methoxybutyl 3-
mercaptopropionate), monooctyltin tris (butyl 3-mercaptopropionate),
Monooctyltin tris (octyl 3-mercaptopropionate), monooctyltin tris (isooctyl 3-mercaptopropionate), monooctyltin tris (2-ethylhexyl 3-mercaptopropionate), monooctyltin tris (methoxy) butyl 3-mercaptopropionate), monolauryltin tris(2-ethylhexyl 3-mercaptopropionate), dimethyltin bis(isooctyl 3-mercaptopropionate), dimethyltin bis(2-ethylhexyl 3-mercaptopropionate),
mercaptopropionate), dimethyltin bis(octadecyl 3-mercaptopropionate),
Dimethyltin bis(oleyl 3-mercaptopropionate), dimethyltin bis(methoxybutyl 3-mercaptopropionate)
-mercaptopropionate), dibutyltin bis(butyl 3-mercaptopropionate), dibutyltin bis(octyl 3-mercaptopropionate), dibutyltin bis(isooctyl 3-mercaptopropionate), dibutyltin bis( 2-ethylhexyl 3-mercaptopropionate),
Dibutyltin bis(octadecyl 3-mercaptopropionate), dibutyltin bis(oleyl 3-mercaptopropionate)
mercaptopropionate), dibutyltin bis(benzyl 3-mercaptopropionate), dibutyltin bis(cyclohexyl 3-mercaptopropionate), dibutyltin bis(methoxybutyl 3-mercaptopropionate), dioctyltin bis( butyl 3-mercaptopropionate),
Dioctyltin bis(octyl 3-mercaptopropionate), dioctyltin bis(isooctyl 3-mercaptopropionate), dioctyltin bis(2-ethylhexyl 3-mercaptopropionate), dioctyltin bis(methoxybutyl 3-mercapto) propionate), dilauryltin bis(2-ethylhexyl 3-mercaptopropionate), bis(dimethyltinisooctyl 3-
mercaptopropionate) oxide, bis(dimethyltin 2-ethylhexyl 3-mercaptopropionate) oxide, bis(dibutyltin isooctyl 3-mercaptopropionate) oxide, bis(dibutyltin 2-ethylhexyl 3-mercaptopropionate) ) oxide, bis(dioctyltin isooctyl 3-mercaptopropionate) oxide, bis(dioctyltin 2-ethylhexyl 3-mercaptopropionate) oxide, etc., and preferred examples include dibutyltin bis(isooctylmercaptoacetate), Dibutyltin bis(2-ethylhexylmercaptoacetate), dioctyltin bis(isooctylmercaptoacetate), dioctyltin bis(2-ethylhexylmercaptoacetate), dibutyltin bis(isooctyl 3-mercaptopropionate), dibutyltin bis(2 -ethylhexyl 3-mercaptopropionate),
Dibutyltin bis(methoxybutyl 3-mercaptopropionate), dioctyltin bis(isooctyl 3-mercaptopropionate), dioctyltin bis(2-ethylhexyl 3-mercaptopropionate), bis(dibutyltinisooctyl 3-mercapto) propionate) oxide, bis(dibutyltin 2-ethylhexyl 3-mercaptopropionate) oxide, bis(dioctyltin isooctyl 3-mercaptopropionate) oxide, bis(dioctyltin 2-ethylhexyl 3-mercaptopropionate) Examples include oxides, and particularly preferred examples include dibutyltin bis(isooctyl 3-mercaptopropionate) and dibutyltin bis(2-ethylhexyl 3-mercaptopropionate). Examples of the organotin sulfur-containing compound represented by general formula (4) include the following. Dimethyltin mercaptoacetate, dibutyltin mercaptoacetate, dioctyltin mercaptoacetate, dilauryltin mercaptoacetate,
Dimethyltin 3-mercaptopropionate, dibutyltin 3-mercaptopropionate, dioctyltin 3-mercaptopropionate, dilauryltin 3-mercaptopropionate, dimethyltin sulfide, dibutyltin sulfide, dioctyltin sulfide, dilauryltin These include sulfides and polymers thereof, preferably dibutyltin 3-mercaptopropionate, dioctyltin 3-mercaptopropionate, dibutyltin sulfide, dioctyltin sulfide, and polymers thereof. The PVC used in the present invention is a vinyl chloride-containing polymer, such as polyvinyl chloride alone or a copolymer mainly composed of vinyl chloride, such as vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl ether copolymer, Vinyl chloride vinylidene chloride copolymer,
Vinyl chloride - propylene copolymer, vinyl chloride -
Examples include ethylene-vinyl acetate copolymer. In addition, the stabilizer used in the present invention can be further combined with known stabilizers such as organic tin fat preventive salts, metal soaps, etc., and lubricants, antioxidants, fillers, pigments, etc. can be added as necessary. You can also do it. The present invention will be specifically explained below using Examples. In this example, parts mean parts by weight. Example 1 50 parts of ABS (Toyorak 100 manufactured by Toray Industries) and PVC
(Geon103Ep-8 manufactured by Nippon Zeon Co., Ltd.) 50 copies with table-1
A formulation containing 4 parts of stabilizer in the proportion shown in 165
The mixture was kneaded for 4 minutes using an 8-inch test roll adjusted to 0.degree. C. to produce a sheet with a thickness of 0.5 mm. The obtained sheet was cut, placed on a glass plate, and heated in a gear type aging tester set at 210°C, and test pieces were taken out at regular intervals and the degree of coloration was visually determined. Further, eight of the obtained sheets were stacked and heat-pressed using a press heated to 185° C. under a pressure of 5 kg/cm ² , and the pressed laminate was removed at regular intervals and the degree of coloration was visually judged. These evaluations are shown in Table 2. The degree of coloring was expressed as the following numerical value. 1 pale yellow 2 yellow 3 tan 4 reddish brown 5 brown 6 black

【table】

[Table] As is clear from the results in Table 2, the method of the present invention significantly improves thermal stability due to a synergistic effect compared to the comparative example. Example 2 Sheets were produced using the formulations shown in Table 3 under the same operating conditions as in Example 1, and tested and evaluated. The judgment evaluation is shown in Table-4. The evaluation method was the same as in Example 1.

【table】

[Table] As is clear from the results in Table 4, the method of the present invention significantly improves thermal stability due to a synergistic effect compared to the comparative example. Example 3 Sheets were prepared under the same operating conditions as in Example 1 using the formulations shown in Table 5, and tested and evaluated. The judgment evaluation is shown in Table-6. The evaluation method was the same as in Example 1.

【table】

【table】

[Table] As is clear from the results in Table 6, the method of the present invention significantly improves thermal stability due to a synergistic effect compared to the comparative example. Example 4 Sheets were prepared under the same operating conditions as in Example 1 using the formulations shown in Table 7, and tested and evaluated. The judgment evaluation is shown in Table-8. The evaluation method was the same as in Example 1.

【table】

【table】

[Table] As is clear from the results in Table 8, the method of the present invention significantly improves thermal stability due to a synergistic effect compared to the comparative example. Example 5 Sheets were prepared under the same operating conditions as in Example 1 using the formulations shown in Table 9, and tested and evaluated. The judgment evaluation is shown in Table-10. The evaluation method was the same as in Example 1.

【table】

【table】

【table】

[Table] As is clear from the results in Table 10, the method of the present invention significantly improves thermal stability due to a synergistic effect compared to the comparative example. Example 6 Sheets were produced using the formulations shown in Table 11 under the same operating conditions as in Example 1, and tested and evaluated. The judgment evaluation is shown in Table-12. The evaluation method was the same as in Example 1.

【table】

【table】

[Table] As is clear from the results in Table 12, the method of the present invention significantly improves thermal stability due to a synergistic effect compared to the comparative example. Example 7 Sheets were prepared using the formulations shown in Table 13 under the same operating conditions as in Example 1, and tested and evaluated. The judgment evaluation is shown in Table-14. The evaluation method was the same as in Example 1.

【table】

[Table] As is clear from the results in Table 14, the thermal stability improvement was only slightly observed in the comparative examples No. 83 to No. 86, and almost no thermal stability improvement was observed in the comparative examples No. 87 and No. 88. does not indicate. On the other hand, it can be seen that the method of the present invention significantly improves thermal stability due to a synergistic effect compared to the comparative example.

Claims (1)

[Claims] 1 The weight ratio of acrylonitrile/butadiene/styrene resin and vinyl chloride resin is about 4:6 to about 6:
4 to 100 parts by weight of the resin composition, 0.5 to 5 parts by weight of the organotin maleate compound, 0.3 to 5 parts by weight of the organotin sulfur-containing compound, but a total of 1.5 to 8 parts by weight of both, and 0.05 to 1.5 parts by weight of magnesium hydroxide. A method for stabilizing synthetic resins, characterized by adding parts by weight.