JPS61130364A - Vinyl chloride resin composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. having excellent thermal stability, extrudability and resistance to weather and impact, consisting of a vinyl chloride resin, a chlorinated vinyl chloride resin and an organotin stabilizer. CONSTITUTION:0.5-10.0pts.wt. organotin stabilizer (e.g. butyltin laurate) is blended with 100pts.wt. mixture of 45-95wt% vinyl chloride resin (A) obtd. by graft-copolymerizing 99-70pts.wt. vinyl chloride onto 1-30pts.wt. acrylic copolymer composed of an alkyl (meth)acrylate whose homopolymer has a second-order transition temp. of -10 deg.C and a monomer whose homopolymerhas a second-order transition temp. of 0 deg.C or above and 55-5wt% chlorinated vinyl chloride resin (B) having a chlorine content of 57.0-75.0wt%.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a vinyl chloride resin composition, and more specifically, a vinyl chloride resin composition for profile extrusion molding, which is suitable for coloring and has a tin stabilizer pigment added thereto. relating to things.

(Prior Art) Vinyl chloride resin has excellent physical and mechanical properties and has many uses such as hard, semi-hard, and soft. However, when a vinyl chloride homopolymer is used for hard materials, it has the disadvantage of poor impact resistance and weather resistance.

In order to improve these drawbacks, it has been developed to blend vinyl chloride homopolymers with various elastomers and to use resins in which vinyl chloride is graft copolymerized with various elastomers.

However, although polymer blends with various elastomers can improve impact resistance, they have the drawbacks of reduced weather resistance and flexural modulus. In addition, the impact resistance of various elastic bodies simply grafted with vinyl chloride is improved compared to the above-mentioned polymer blend of a homopolymer and an elastic body, but depending on the processing conditions, the impact resistance and flexural modulus It had the defect that it was affected.

Therefore, in order to overcome the above-mentioned drawbacks, the present inventors have developed an alkyl acrylate and/or a furkyl methacrylate whose homopolymer has a secondary transition temperature of -10°C or lower, and a homopolymer with a secondary transition temperature of -10°C or less. Using a vinyl chloride resin made by graft copolymerizing vinyl chloride to a copolymer with a monomer that has a temperature of 0°C or higher, it is blended with lead-based stabilizers and titanium white, resulting in less deterioration of physical properties and good weather resistance and impact resistance. The present invention provides a vinyl chloride resin composition which has excellent properties and processability (Japanese Patent Application No. 59-211027).

(Problems to be Solved by the Invention) However, the above vinyl chloride resin composition proposed by the present inventors has excellent weather resistance and impact resistance, so it can be used for building materials such as window frames and decking materials using profile extrusion molding. However, because it is essential to use a lead-based stabilizer, which has a large thermal stability effect, and titanium white as a pigment, only white products can be obtained.

Nowadays, products made of vinyl chloride resin colored with colored pigments are required depending on the intended use. As a stabilizer for obtaining such colored products, a nucleated tin-based stabilizer is used because it is required to have a large thermal stability effect, excellent weather resistance, and extrusion processability6. Although it is certainly possible to extrude colored products using these stabilizers, the melt viscosity of the resin is significantly different from extrusion molding using lead-based stabilizers.
It was difficult to produce multiple products using the same mold. Therefore, it is necessary to prepare one set of molds for each stabilizer system, which is very economically disadvantageous.

(Means for Solving the Problems) As a result of extensive studies in order to improve the above-mentioned drawbacks, the present inventors have discovered that an alkyl acrylate whose homopolymer has a secondary transition temperature of 110°C or less and/or A vinyl chloride resin made by graft copolymerizing vinyl chloride to a copolymer of an alkyl methacrylate and a monomer whose homopolymer has a secondary transition temperature of 01 or more is mainly blended with a vinyl chloride resin and an organotin stabilizer. If a polyvinyl chloride resin composition colored with a pigment is used for profile extrusion molding, a polyvinyl chloride resin composition containing the above vinyl chloride resin, a lead stabilizer, and titanium white as a main component will be used for profile extrusion molding. The inventors have discovered that molding can be performed using the same mold as above, leading to the present invention.

That is, the present invention provides (&) acrylic copolymers 1 to 30
Based on 100 parts by weight of a mixture containing 45-95% by weight of a vinyl chloride resin obtained by graft copolymerizing 38-70 parts by weight of vinyl chloride and 55-5% by weight of a chlorinated vinyl chloride resin. , (b) organotin stabilizer 0.5
The object of the present invention is to provide a vinyl chloride-based resin composition with excellent processability, characterized in that it contains 10.0 parts by weight of polyvinyl chloride.

The acrylic copolymer used in the present invention is a copolymer mainly composed of alkyl acrylate and/or alkyl methacrylate with other monomers.

Regarding alkyl acrylate and/or alkyl methacrylate, those having a secondary transition temperature of 110°C or less when made into a homopolymer are advantageous because of their excellent impact resistance.For example, ethyl acrylate, n-propyl acrylate, Iso-butyl acrylate, n-butyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, n-decyl acrylate, n-octyl methacrylate, n-decyl methacrylate, n-dodecyl methacrylate, lauryl methacrylate etc. can be mentioned.

Alkyl 7 acrylate and/or alkyl methacrylate acts as a soft segment in both the acrylic copolymer and the graft copolymer, and the amount used is preferably 35 to 60% by weight in the acrylic copolymer.
If it exceeds 70% by weight, no improvement in the flexural modulus can be expected, and if it is less than 70% by weight, the impact resistance decreases, which is not preferable.

In addition, other monomers include alkyl acrylate and/or
Or, by copolymerizing with alkyl methacrylate, it acts as a hard segment in an acrylic copolymer or a graft copolymer, and a homocopolymer having a secondary transition temperature of 01 or higher is advantageous, such as a monofunctional copolymer. ethylene, propylene, hexene, aromatic vinyls such as styrene, α-methylstyrene, vinyltoluene, unsaturated nitriles such as acrylonitrile, methacrylates, vinyl acetate, vinyl propionate, etc. Vinyl esters such as butyl vinyl ether, octyl vinyl ether, and lauryl vinyl ether; fulkyl acrylates such as methyl acrylate; fulkyl methacrylates such as methyl methacrylate, ethyl methacrylate, and propyl methacrylate; For example, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, 1.3-propylene glycol dimethacrylate, 1.3-butylene glycol dimethacrylate, Examples include (poly)alkylene glycol acrylates or methacrylates such as 1.4-butylene gelicol dimethacrylate, polyallyl compounds such as diallyl phthalate, diallyl maleate, diallyl fumarate, and diallyl succinate, divinylbenzene, butadiene, etc. .

The amount of this monomer to be used is preferably 1 to 4% by weight in the acrylic copolymer; if it is less than 1% by weight, no improvement in the flexural modulus can be expected, and if it exceeds 40% by weight, the impact resistance will deteriorate. Among these monofunctional monomers, it is preferable to use methyl methacrylate, methyl acrylate, acrylonitrile, and styrene; Preferably, they are used alone or in combination.

The copolymer of alkyl acrylate and/or alkyl methacrylate and a monomer used in the present invention is produced by polymerization methods such as emulsion polymerization, suspension polymerization, solution polymerization, and bulk polymerization using generally known emulsifiers, dispersants, catalysts, etc. In order to advantageously carry out the present invention, it is desirable to employ emulsion polymerization.

To obtain a copolymer by a general emulsion polymerization method, for example, pure water, an anionic emulsifier, and a water-soluble polymerization catalyst are placed in a jacketed polymerization reactor, the air inside the can is excluded, and then the alkyl acrylate and Alternatively, alkyl methacrylate and 7-mer are charged, and after emulsification, the inside of the can is heated with a jacket to start a copolymerization reaction. This copolymerization reaction is an exothermic reaction, and the internal temperature is controlled by a jacket if necessary.After one reaction is completed, unreacted heptamers are removed from the can to obtain an acrylic copolymer.

The method of charging into the polymerization reactor is not limited. Further, if necessary, a particle size adjusting agent for the acrylic copolymer, a catalyst decomposition accelerator, etc. may be added to control the copolymerization reaction.

Next, in the present invention, the amount of the acrylic chloride copolymer of vinyl chloride used as the base polymer is 1 to 30 parts by weight.

If the amount of the acrylic copolymer used is less than 1 part by weight, the impact resistance will not be sufficient, and if it exceeds 30 parts by weight, the impact resistance will improve, but the flexural modulus will decrease, which is not preferable.

Graft copolymerization methods include suspension polymerization, emulsion polymerization,
Examples include solution polymerization method, solventless polymerization method, etc., but in order to carry out the present invention advantageously, it is desirable to employ suspension polymerization method.

The amount of water used is 1 to 5 times, preferably 1 to 3 times, relative to the total amount of chlorinated acrylic copolymer and vinyl chloride hexamer in the suspension polymerization method.

To obtain a graft copolymer resin by a general suspension polymerization method, for example, pure water,
Add a suspension stabilizer such as hydroxypropyl methyl cellulose, a radical polymerization initiator, and if necessary a polymerization degree lowering agent, add an acrylic copolymer to the WAF3L,
It is then charged with other vinyl compounds in the can. Thereafter, the inside of the can is heated by a jacket, the acrylic copolymer is dissolved in vinyl chloride, and graft copolymerization is started. Graft copolymerization is an exothermic reaction, and the internal temperature is controlled by a jacket as necessary.

After the reaction is completed, unreacted vinyl chloride is removed from the can to obtain a slurry of graft copolymer resin. The slurry is dehydrated and dried according to a conventional method to obtain a graft copolymer resin. Furthermore, the charging method to the polymerization reactor is not limited, and among the charged raw materials such as pure water, suspension stabilizer, acrylic copolymer, and vinyl chloride, the acrylic copolymer is replaced with vinyl chloride. A method of melting and charging is also adopted.

In graft copolymerization, other monomers may be present in the coexistence as long as impact resistance, weather resistance, and physical properties are not deteriorated.

In addition, it is advantageous to carry out the graft copolymerization by a radical polymerization method, and the radical polymerization initiators used for this purpose include lauroyl peroxide, tert-butyl peroxybivalate, diisopropyl peroxydicarbonate, dioctyl peroxy Oil-soluble polymerization initiators for organic nitrogen oxides such as dicarbonate, azo compounds such as 2,2'-azobisisobutyronitrile, 2,2'-7zobis-2,4-dimethylhereronitrile, and water-soluble polymerization initiators such as potassium persulfate and ammonium persulfate. The amount of these polymerization initiators used is preferably 5 to 1.0 parts by weight of Q,QO per 100 parts by weight of vinyl chloride.

Dispersants include methylcellulose, ethylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, polyvinyl alcohol and partially saponified products thereof, gelatin, polyvinylpyrrolidone, starch, and other laxatives, magnesium carbonate, calcium carbonate, calcium phosphate, etc. Inorganics may be used alone or in combination. The amount used is usually 0.301 to 1.0 parts by weight per 100 parts by weight of vinyl chloride.

Furthermore, in this graph (1), the chain transfer agent used in the conventional method for polymerizing vinyl monomers is 0.001 to 1.0 parts per 100 parts by weight of vinyl chloride.
It may be added in parts by weight.

The degree of polymerization of the graft copolymer is 400-1500, preferably 700-1350.

Next, the chlorinated vinyl chloride resin used in the present invention is a vinyl chloride resin further reacted with chlorine. This chlorinated vinyl chloride resin will be explained in detail below.

The chlorine content of this chlorinated vinyl chloride resin is 57.0 to 7.
5.0% by weight, preferably 58-70% by weight,
If it is less than 8% by weight, the increase in melt viscosity is small;
Exceeding this percentage by weight is not preferable because processability and thermal stability deteriorate.

The chlorinated vinyl chloride resin used in the present invention is produced by a solution method using titanium tetrachloride or the like, or a suspension method using chloroform, water, carbon tetrachloride, or the like. In order to carry out the present invention advantageously, it is desirable to employ a suspended pA polymerization method.

Chlorinated vinyl chloride resin is prepared using a general suspension method. , 1 bow, −, h
A) Pure water, vinyl chloride resin, Cone, HCl
(approximately 35%) A swelling agent such as CHC13, a dispersing agent, and a radical polymerization initiator are charged, the air inside the can is removed, and while stirring, the inside of the can is heated by a jacket, kept at 60°C, and chlorine is added. Gas is introduced and the reaction continues until the desired chlorine content is reached.

After the reaction is complete, filter the slurry and remove the filter cake with N.
a) Wash with an alkaline solution such as HCOa solution, further wash with water until neutral, and dry with hot air to obtain a chlorinated vinyl chloride resin.

The method of charging into the reactor is not limited.

The backbone polymer used for chlorination is preferably obtained by a suspension polymerization method, and has a degree of polymerization of 400 to 1200, preferably 500 to 1350. The amount of water used is 1 to 5 times the amount of vinyl chloride resin, preferably 1 to 3 times
It's double.

Swelling agents for vinyl chloride resin include methyl chloride,
dichloromethane, chloroform, tetrachloride i, t', 1
, 2-jiggloethane, tetrachloroethane, chlorobenzene, etc. are used alone or in combination.

The amount used is 5.5 parts per 100 parts by weight of vinyl chloride resin.
The dispersing agent in an amount of 0 to 60.0 parts by weight is polyvinyl alcohol used in ordinary polymerization, partially saponified products thereof, methyl cellulose, ethyl cellulose, gelatin, etc., and the amount used is 0.01 to 1.0 parts by weight. Parts by weight are sufficient.

As a reaction catalyst, organic peroxides such as lauroyl peroxide, tert-butyl peroxybivalate, diisopropyl peroxydicarbonate, dioctyl peroxycarbonate, 2,2-7 zobisisobutyronitrile, 2.2° Oil-soluble radical polymerization initiators such as azo compounds such as -7zobis-2,4-dimethylvaleronitrile, and halogen compounds such as titanium tetrachloride, phosphorus pentachloride, antimony trichloride, and boron trifluoride are used.

In addition, chlorination without using a reaction solvent may be carried out by irradiation with light, ultraviolet rays, or γ-rays.

The amount of chloride using an oil-soluble radical polymerization initiator is 0.05 to 1.0 parts by weight per 100 parts by weight of vinyl chloride resin.
Parts by weight.

The reaction temperature is θ~200''0, preferably 50~
lOO℃. The introduction rate of chlorine gas is 0.5~
A rate of 10.0 g/min is preferred and the reaction time is
1-15 hours, preferably 2-10 hours. It is preferable to remove the swelling agent by steam distillation or azeotrope using methanol or the like, since this improves thermal stability.

Examples of the organotin stabilizer used in the resin composition of the present invention include butyltin laurate, butyltin laurate malate, butyltin carboxylate, butyltin maleate, butyltin malate polymer, Butyltin mercapto, octyltin laurate, octyltin malate,
Laurate type, octyltin maleate type, octyltin mercapto type, and methyltin mercapto type are used alone or in combination of two or more types. The amount of S-based stabilizer to be used is preferably 0.5 to 10 parts by weight per 100 parts by weight of the mixture of vinyl chloride resin and chlorinated vinyl chloride resin, and if it is less than 0.5 parts by weight, thermal stability will be insufficient and If the temperature exceeds 50%, the effect of thermal stability will not change, which is economically disadvantageous.

Furthermore, fillers, lubricants, other resins, plasticizers, ultraviolet absorbers, antistatic agents, antioxidants, flame retardants, pigments, etc. that are blended during processing of vinyl chloride resin are blended as necessary.

Fillers include calcium carbonate, talc, silica,
Although clay and the like can be used, those having an average particle size of 1 l or less, preferably 0.7 l or less are suitably used.

Examples of lubricants include hydrocarbon lubricants such as natural paraffin, liquid paraffin, and polyethylene wax, fatty acid lubricants such as stearic acid, fatty acid amide lubricants such as stearamide, ester lubricants such as ethylene glycol monostearate, and stearyl alcohol. Examples include higher alcohol-based lubricants such as, and metal soap-based lubricants such as calcium laurate.

The effects of lubricants include adjusting the friction between the wall of the processing machine and the plastic material (external lubricity), adjusting gelation of the plastic (internal lubricity), enhancing the stabilizing effect of stabilizers, and adjusting processability. In order to achieve these effects, it is advantageous to combine two or more types of materials, one having external lubricity and one having internal lubricity.

The amount used for the lubricant is 0.5 to 5.0 parts by weight, preferably 0.5 to 3.0 parts by weight, and 0.5 parts by weight based on 100 parts by weight of the mixture of vinyl chloride resin and chlorinated vinyl chloride resin. If it is less than 100 mm, a large amount of frictional heat will be generated due to the lack of internal and external lubricity, and it will already gel in the compression zone, causing an increase in viscosity and temperature, causing decomposition and discoloration of the resin.

On the other hand, if it exceeds 3.0 parts by weight, the lubricity is not strong enough to cause insufficient kneading and insufficient gelation, which is not preferable.

Other resins that can be added include ethylene/vinyl acetate,
Copolymers such as methyl acrylate/butyl acrylate, methyl methacrylate/ethyl acrylate, methyl acrylate/butyl methacrylate, ethylene/vinyl acetate/vinyl chloride ternary copolymer, chlorinated polyethylene, acrylonitrile/butadiene/styrene ternary copolymer, methyl methacrylate/butadiene/ Styrene/methyl methacrylate/butyl acrylate/ethyl acrylate, methyl methacrylate/ethyl acrylate/acrylonitrile, ternary copolymers such as methyl methacrylate/styrene/butyl acrylate, methyl methacrylate/butyl methacrylate/ethyl acrylate/ethyl methacrylate quaternary copolymers, etc.Pv
Any resin that is compatible with C and does not impair the physical properties of the composition of the present invention may be added at 1%.
.

Examples of plasticizers include phthalate esters, trimellitate esters, adipate esters, phosphate plasticizers, epoxy plasticizers, and polyester plasticizers.

Examples of UV absorbers include benzophenone-based UV absorbers such as 2,4-dihydroxybenzonephenone, benzotriazole-based UV absorbers such as 2-(2''-hydroxy-5-methylphenyl)benzotriazole, and salicylic acid ester-based UV absorbers such as phenyl salicylate. Examples of the antistatic agent include anionic surfactants, cationic surfactants, and nonionic surfactants.

As an antioxidant, 2.2"-methylene-bis-(4
-methyl-6-tert-butylphenol), monophenol-based antioxidants such as 2,6-ditertiary-butylphenol, and hydroquinone-based antioxidants such as 2,5-ditertiary-butylhydroquinone.

Examples of flame retardants include known halides such as chlorinated paraffin, chlorinated polyethylene, perchloropentacyclodecane, hexabromobenzene, decabromodiphenyl ether, and tetrabromobisphenol A, antimony trioxide, antimonate, and barium metaborate. , zinc borate, aluminum hydroxide, and other inorganic compounds.

Pigments include inorganic pigments such as barium sulfate, calcium carbonate, zinc oxide, titanium oxide, iron oxide, chromium oxide, silica, mica, talc, and carbon black, and organic pigments such as diazo yellow, Lakerad C, phthalocyanine blue or green. Any pigment can be used, and other colorants such as dyes can also be used.

The vinyl chloride resin composition of the present invention is a vinyl chloride resin in which 99 to 70 parts by weight of vinyl chloride is graft copolymerized to 1 to 30 parts by weight of an acrylic copolymer, and a lead-based stabilizer and titanium white are mainly blended. A vinyl chloride resin prepared by graft copolymerizing 95 to 70 parts by weight of vinyl chloride to 1 to 30 parts by weight of an acrylic copolymer to match the melt viscosity of the vinyl chloride resin composition and chlorinated chlorine with a chlorine content of 58 to 70%. Mainly contains vinyl chloride resin, nucleated tin stabilizer, and pigment.

The vinyl chloride resin composition of the present invention is blended to a desired melt viscosity and mixed uniformly by a known method using a Henschel mixer, a ribbon blender, etc., to form a powder.

If the vinyl chloride resin composition of the present invention, for example, powder or beret/) is used, the acrylic copolymer 1 to 30
Building materials such as window frames and decking materials are produced using the same mold as the powder or pellets that are made by graft copolymerizing vinyl chloride resin with 33 to 70 parts by weight of vinyl chloride, mainly containing lead-based stabilizers and titanium white. can be molded using a single-screw extruder, twin-screw extruder, or multi-screw extruder. *The vinyl chloride resin composition of the invention has excellent weather resistance and impact resistance, and is particularly suitable for molding colored products.

(Example) Hereinafter, the present invention will be explained more specifically based on Examples.

Example 1 Two parts of deionized water were added to a polymerization vessel with an internal volume of 7 ml equipped with a stirrer.
7QOkg, partially saponified polyvinyl alcohol 2.0
5 kg, methyl cellulose 2.05 kg, 2,2°-azobisisobutyronitrile 0.075 kg, 2,2°-7zobis-2,4-dimethylvaleronitrile 0.24
kg and n-butyl acrylate 87% by weight and 1.3
- After charging 800kg of 15% acrylic copolymer latex with a composition of 3% by weight of butylene glycol dimethacrylate and removing the air inside, 1410kg of vinyl chloride was charged.
After melting at 35°C for 1 hour, polymerization was carried out at 57°C, and 10 hours after the start of polymerization, the internal pressure of the polymerizer was 8.5 kg/c.
When the unreacted monomer was collected and the slurry was dehydrated and dried, 1275 kg of white powder resin was obtained. The degree of polymerization of this resin was 1030, and the content of components other than vinyl chloride was 7.0% by weight. 75 parts by weight of the obtained graft copolymer resin, 25 parts by weight of chlorinated vinyl chloride resin with a chlorine content of 65% (degree of polymerization of base resin 800), and tin-based stabilizer IRGASTA manufactured by Civer Geigy.
BT-633 (product name) 3 parts by weight 1 Day Kiseiro Lubricant Paraffin Wax 155 (product name) 0.4 parts by weight, Mitsui Petrochemicals Co., Ltd. Lubricant Old-wax 450P (product name) 0
．． 2 parts by weight, 1.0 parts by weight of processing aid PA20 (trade name) manufactured by Kanebuchi Kagaku Co., Ltd., ultraviolet absorber T manufactured by Ciba Gaikie Co., Ltd.
lNUVlN320 (trade name) 0.3 parts by weight, antioxidant TRGANOX 107B (trade name) manufactured by Ciba Geikie 0.1 part by weight Pigment MIKRO manufactured by Ciba Gaikie
LITHbrown 5RKP (product name) 0.7 parts by weight M [KROLITHblue 4GKP (product name> 0
．． A powder was prepared using a formulation of 0.07 parts by weight.

For mixing, the graft copolymer resin and compounding agents were placed in a Henschel mixer, heated to 120°C while stirring, and then heated to 40°C.
It was cooled and then discharged.

Using this powder, the melt viscosity was measured using a Brabender Plastograph. It was Okgφrin.

Also, this powder and φ30 twin screw extrusion 4I in different directions!
(manufactured by Plastic Engineering Research Institute).

The molding conditions and results are shown in Table 1.

Reference Example 1 Graft copolymer resin 75 obtained in the same manner as Example 1
Parts by weight include 2 parts by weight of tribasic lead sulfate, 2 parts by weight of dibasic lead phosphite, pigment manufactured by 6 Hara Sangyo Co., Ltd., and titanium white R-950 (
Product name) 3 parts by weight, CaO stearate, 4 parts by weight, 0.4 parts by weight of stearic acid, Loxi lubricant manufactured by Henkel
ol G-80 (trade name) 0.4 parts by weight, Logiol
A powder was prepared using a blending recipe of 0.4 parts by weight of G-30 (trade name) and 0 parts by weight of PA-201 and 5 parts by weight of Calcium Carbonate Hakuenka C; CR (trade name) manufactured by Koeseki Kogyo Co., Ltd.

Mixed in the same manner as in Example 1, the melt viscosity of this powder was measured using a Brabender Plastograph and found to be 4.0k.
g layer. Also, using this powder, φ30m5
Table 1 shows the six conditions and results of extrusion molding using a twin-screw extruder in different directions.

Comparative Example 1 In Example 1, 75 parts by weight of the graft copolymer resin was added to 10
A powder was prepared in the same manner as in Example 1, except that the addition of 25 parts by weight of chlorinated vinyl chloride resin with a chlorine content of 65% was stopped. When melt viscosity was measured, 3
．． It was 8kg Peng.

In addition, extrusion molding was performed using this powder using a φ3 o/l twin-screw extruder in different directions.

The molding conditions and results are shown in Table 1.

In addition, the Brapengu Plastograph (Brabender Co., Ltd.) conditions employed in each of the above Examples, Reference Examples, and Comparative Examples are as follows.

Kneader 50cc Temperature: 150°C Rotation speed: 50p Sample amount: 65g Mixture: Lead-based Qr-tin-based weight: 10kg Preheating: 3 minutes As is clear from the results in the IT table, the melt viscosity of the present invention was adjusted using the Brabender plastograph. The composition could be extruded under the same mold conditions as the composition mainly containing lead-based stabilizer and TIO2, and the obtained product had good surface condition and shape.

Claims (1)

[Claims] 1. (a) 45 to 95% by weight of vinyl chloride resin and 55 to 5% by weight of chlorinated vinyl chloride resin obtained by graft copolymerizing 95 to 70 parts by weight of vinyl chloride to 1 to 30 parts by weight of acrylic copolymer A vinyl chloride resin with excellent processability, characterized in that (b) 0.5 to 10.0 parts by weight of an organic tin stabilizer is blended with 100 parts by weight of a mixture containing % by weight. Composition.