JPH0733936A - Chlorine-containing resin composition - Google Patents

Abstract

PURPOSE:To improve the resistance to initial coloration, thermal stability, etc., of the title compsn. by compounding a chlorine-contg. resin with methyltin mercaptide, octyltin mercaptide, and an alkyltin sulfide. CONSTITUTION:The compsn. excellent in resistance to initial coloration, heat resistance, etc., is obtd. by compounding a chlorine-contg. resin (e.g. a vinyl chloride-vinyl acetate copolymer) with methyltin mercaptide, octyltin mercaptide, and an alkyltin sulfide in an amt. of 0.01-5 pts.wt., pref. 0.1-3 pts.wt., based on 100 pts.wt. the resin. Methyl- or octyltin mercaptide is produced by reacting methyl-or octyltin chloride or oxide with a compd. represented by HS (CH2)nCOOR (wherein R is 1-23C alkyl or alkenyl; and n is 1-2). An alkyltin sulfide is produced by reacting an alkyltin chloride with sodium sulfide.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a novel chlorine-containing resin composition.

[0002]

2. Description of the Related Art Chlorine-containing resin compositions such as polyvinyl chloride are excellent in transparency, strength, processability, colorability, etc., and are inexpensive, so that they can be used in films, sheets, pipes, joints, and more recently in vehicles. It is also used in large quantities for leather and other products.

When chlorine-containing resin is exposed to light or heat,
Decomposition and deterioration mainly caused by dehydrochlorination reaction,
It produces a conjugated double bond, a so-called polyene structure, which causes coloration. Further, if the decomposition further proceeds, molecular cutting or cross-linking occurs, resulting in a decrease in mechanical strength and the like, resulting in brittleness.

Therefore, in order to prevent the dehydrochlorination reaction from occurring due to the heat during molding, resulting in deterioration of the color tone of the product and deterioration of the physical properties of the product, a chlorine-containing resin composition is added. Is mixed with various stabilizers.

Stabilizers include lead, cadmium, zinc,
Organic acid salts such as calcium and organic tin compounds are most often used.

Further, recently, the demand for non-toxic resin products has increased, and the demand for zinc, calcium organic acid salts, methyltin compounds, and octyltin compounds as stabilizers has been increasing.

[0007]

The present invention pays particular attention to non-toxic stabilizers, and in view of the present situation, existing zinc, calcium organic acid salts, methyltin compounds and octyltin compounds have their own performance. Although it is used, it still has problems in initial colorability, durability, and product appearance.

[0008]

[Means for Solving the Problems] The present inventors have made strenuous efforts to solve the above problems, and as a result of intensive studies, the above problems were solved by a chlorine-containing resin composition containing methyltin mercaptide, octyltin mercaptide and alkyltin sulfide. The present invention has been completed by finding that it can be obtained.

The methyltin mercaptide and octyltin mercaptide may be any one of monomethyltin mercaptide and dimethyltin mercaptide alone or a mixture thereof, and any one of monooctyltin mercaptide and dioctyltin mercaptide alone or a mixture thereof.

The tin compound is methyl or octyl tin chloride or oxide and HS (CH ₂ ) _n CO 2.
An alkyl tin mercaptide is produced by reacting a compound represented by OR or HS (CH ₂ ) _n OCOR.

In the above, R is an alkyl or alkenyl group in which C is 1 to 23, and n is 1 or 2.

The compound is also an ester of HSRCOOH and ROH or an ester of HSROH and RCOOH.

[0013] It is a group of compounds that are usually produced by the following method.

It is prepared by reacting mono- and / or dialkyl tin chloride with sodium sulfide, sodium hydrosulfide or hydrogen sulfide.

In some cases, mono- or dimethyl (octyl) tin mercaptide may be synthesized and then the above-mentioned raw materials may be added thereto for reaction.

The alkyl group of the alkyltin sulfide may be any of methyl, butyl and octyl.

The amount of methyltin mercaptide, octyltin mercaptide and alkyltin sulfide contained in the chlorine-containing resin is 0.01 to 5 parts by weight, preferably 0.1 parts by weight, based on 100 parts by weight of the resin. ~ 3 parts by weight.

Further, in the present invention, other stabilizers, flame retardants, fillers, which are conventionally used for chlorine-containing resins,
It goes without saying that a heat stabilization aid, an antioxidant, an ultraviolet absorber, an epoxy compound, a lubricant, a pigment and the like may be used in combination.

The chlorine-containing resin of the present invention is a vinyl chloride homopolymer or a resin mainly composed of vinyl chloride, and examples thereof include vinyl chloride and vinyl acetate, vinylidene chloride, ethylene, propylene, methacrylic acid ester and urethane resin. And a copolymer with these resins or a blend with these resins.

[0020]

EXAMPLES The present invention will be specifically described below based on examples.

Example A sample containing each component shown in Table 1 was tested by a Brabender Plastograph under the conditions of a kneader temperature of 180 ° C., a rotor rotation number of 40 rpm, and a sample preparation amount of 70 g.

The results are shown in Table 1.

[Table 1]

Samples containing the components shown in Table 2 were compounded with a 20 l supermixer at 90 ° C. and a pipe was extruded under the following conditions.

Extrusion conditions Extruder: 50 mmφ single screw extruder Screen: L / D = 22, CR = 3, rotation speed 20 rp
m Dye: 20 mmφ, pipe die sizing: vacuum sizing Setting temperature: C ₁ 150 ° C, C ₂ 160 ° C, C ₃ 170
℃, H ₁ 180 ℃, D ₁ 200 ℃, D ₂ 200 ℃ All molding is by powder extrusion. The results are shown in Table 3.

[0025]

[Table 2]

[0026]

[Table 3]

[0027]

As can be seen from the above, the chlorine-containing resin composition according to the present invention exhibits excellent stability and initial colorability that have not been found in the past.

Claims (1)

[Claims] 1. A chlorine-containing resin composition containing methyltin mercaptide, octyltin mercaptide and alkyltin sulfide.