JPH0588271B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a vinyl chloride resin composition, and more particularly to a vinyl chloride resin composition for profile extrusion molding, which contains a tin stabilizer and a pigment and is suitable for coloring. (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, techniques have been developed that involve polymer blending of vinyl chloride homopolymers and various elastomers, and techniques that 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 alkyl methacrylate whose homopolymer has a secondary transition temperature of -10°C or lower, and a homopolymer whose secondary transition temperature is -10°C or lower. We use vinyl chloride resin, which is a graft copolymerization of vinyl chloride to a copolymer with a monomer that has a temperature of 0°C or higher, and contains lead-based stabilizers and titanium white, resulting in less deterioration of physical properties and excellent weather resistance and impact resistance. A vinyl chloride resin composition which is excellent and has excellent processability was provided (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 have come to be required depending on the intended use. As a stabilizer for obtaining such a colored product, an organotin-based stabilizer is used because it is required to have a large thermal stability effect and be excellent in weather resistance and extrusion processability. However, 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, so it is difficult to extrude colored products using the same mold. Co-birth was difficult. 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 intensive studies to improve the above drawbacks, the present inventors have discovered that an alkyl acrylate whose homopolymer has a secondary transition temperature of −10° C. or lower 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 0°C or higher, a chlorinated vinyl chloride resin, and an organotin stabilizer. If a polyvinyl chloride resin composition is blended with the above vinyl chloride resin and colored with a pigment and used for profile extrusion molding, a vinyl chloride resin composition containing the above vinyl chloride resin, a lead stabilizer, and titanium white as a main ingredient will be used. It was discovered that molding can be performed using the same mold used for profile extrusion molding, leading to the present invention. That is, the present invention provides (a) 99 to 60% by weight of an alkyl acrylate and/or alkyl methacrylate whose homopolymer has a secondary transition temperature of -10°C or lower and a homopolymer whose secondary transition temperature is 0°C or higher. 45-95% by weight of vinyl chloride resin and 55% by weight of chlorinated vinyl chloride resin obtained by graft copolymerizing 99-70 parts by weight of vinyl chloride with 1-30 parts by weight of an acrylic copolymer containing 1-40% by weight of monomers. (b) organotin stabilizer per 100 parts by weight of the mixture containing ~5% by weight;
The object of the present invention is to provide a vinyl chloride resin composition with excellent processability, characterized in that it contains 0.5 to 10.0 parts by weight. The acrylic copolymer used in the present invention is
It is a copolymer mainly composed of alkyl acrylate and/or alkyl methacrylate with other monomers. As the alkyl acrylate and/or alkyl methacrylate, those having a secondary transition temperature of -10°C or lower when made into a homopolymer are advantageous because of their excellent impact resistance.For example, ethyl acrylate,
n-propyl acrylate, isobutyl 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,
Examples include lauryl methacrylate. Alkyl acrylate and/or alkyl methacrylate acts as a soft segment in both the acrylic copolymer and the graft copolymer, and the appropriate amount to be used is 99 to 60% by weight in the acrylic copolymer. If it exceeds 60% by weight, no improvement in flexural modulus can be expected, and if it is less than 60% by weight, the impact resistance will decrease, which is not preferable. In addition, other monomers act as hard segments in acrylic copolymers and graft copolymers by copolymerizing with alkyl acrylate and/or alkyl methacrylate, and the second-order transition temperature of the homocopolymer increases. A temperature of 0°C or higher is advantageous, such as monofunctional monomers such as olefins such as ethylene, propylene, and hexene, aromatic vinyls such as styrene, α-methylstyrene, and vinyltoluene, and acrylonitrile and methacrylonitrile. Unsaturated nitriles, vinyl esters such as vinyl acetate and vinyl propionate, vinyl ethers such as butyl vinyl ether, octyl vinyl ether, lauryl vinyl ether, alkyl acrylates such as methyl acrylate, methyl methacrylate,
Alkyl methacrylates such as ethyl methacrylate and propyl methacrylate, polyfunctional monomers such as 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, 1,4-butylene glycol dimethacrylate, etc. (poly)alkylene glycol acrylates or methacrylates, diallyl phthalate, diallyl maleate, diallyl fumarate, diallyl Examples include polyallyl compounds such as succinate, divinylbenzene, and butadiene. The amount of this monomer used is preferably 1 to 40% by weight in the acrylic copolymer; if it is less than 1% by weight, no improvement in the flexural modulus can be expected;
Exceeding this is not preferable because impact resistance decreases. Among these monofunctional monomers, it is preferable to use methyl methacrylate, methyl acrylate, acrylonitrile, and styrene in order to avoid deterioration of physical properties, and each may be used alone or in combination with a polyfunctional monomer. is preferable. Alkyl acrylate and/or used in the present invention
Alternatively, a copolymer of an alkyl methacrylate and a monomer can be obtained by a polymerization method such as emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization using generally known emulsifiers, dispersants, catalysts, and the like. To advantageously carry out the 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 removed, and then the alkyl Acrylate and/or alkyl methacrylate and monomer are charged, and after emulsification, the inside of the can is heated with a jacket to start the copolymerization reaction. This copolymerization reaction is an exothermic reaction, and the internal temperature is controlled by a jacket as necessary. After the reaction is completed, unreacted monomers 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 for controlling the copolymerization reaction, etc. may be added. Next, in the present invention, graft copolymerization of vinyl chloride is carried out using the thus obtained acrylic copolymer as a backbone polymer. In this case, the amount of acrylic copolymer used is 1 to 30
Parts by weight are appropriate. 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. Examples of the graft copolymerization method include suspension polymerization, emulsion polymerization, solution polymerization, and solventless polymerization, but in order to carry out the present invention advantageously, it is desirable to employ suspension polymerization. When carrying out the suspension polymerization method, the amount of water used is 1 to 5 times, preferably 1 to 3 times, the total amount of the acrylic copolymer and vinyl chloride monomer. A method for obtaining a graft copolymer resin by a general suspension polymerization method includes, for example, adding pure water, a suspension stabilizer such as hydroxypropyl methylcellulose, a radical polymerization initiator,
If necessary, a polymerization degree reducing agent is added, and the acrylic copolymer is added thereto and suspended, the air inside the can is then removed, and then vinyl chloride is charged together with other vinyl compounds as required. Thereafter, the inside of the can is heated with a jacket to dissolve the acrylic copolymer in the vinyl chloride and initiate graft copolymerization. Graft copolymerization is an exothermic reaction, and the internal temperature is controlled by the jacket as necessary. After the reaction is complete, unreacted vinyl chloride is removed from the can,
A slurry-like graft copolymer resin is obtained. 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 radial polymerization method, and the radical polymerization initiators used for this purpose include lauroyl peroxide, tert-butyl peroxypivalate,
Organic peroxides such as diisopropyl peroxydicarbonate and dioctyl peroxydicarbonate; oils of azo compounds such as 2,2'-azobisisobutyronitrile and 2,2'-azobis-2,4-dimethylvaleronitrile; Examples include soluble polymerization initiators, and water-soluble polymerization initiators such as potassium persulfate and ammonium persulfate. The amount of these polymerization initiators used is 0.005 to 100 parts by weight of vinyl chloride.
The amount is preferably 1.0 part by weight. Examples of dispersants include methylcellulose, ethylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, polyvinyl alcohol and its partially saponified products, gelatin, polyvinylpyrrolidone, organic substances such as starch, and inorganic substances such as magnesium carbonate, calcium carbonate, and calcium phosphate. Used alone or in combination. The amount used is usually 0.01 to 1.0 parts by weight per 100 parts by weight of vinyl chloride. Furthermore, in this graft copolymerization, a chain transfer agent used in conventional methods for polymerizing vinyl monomers may be added in an amount of 0.001 to 1.0 parts by weight per 100 parts by weight of vinyl chloride. 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
~75.0% by weight, preferably 58-70% by weight,
If it is less than 57.0% by weight, the increase in melt viscosity will be small, and if it exceeds 75.0% by weight, processability and thermal stability will deteriorate, which is not preferable. The chlorinated vinyl chloride resin used in the present invention is
It is manufactured by a solution method using ethane tetrachloride, etc., or a suspension method using chloroform, water, carbon tetrachloride, etc. In order to carry out the present invention advantageously, it is desirable to employ a suspension polymerization method. As a method for obtaining chlorinated vinyl chloride resin by a general suspension method, for example, in a reactor with a jacket, pure water, vinyl chloride resin, Conc.HCl (about 35%),
A swelling agent such as CHCl ₃ , a dispersing agent, and a reaction catalyst are charged, the air inside the can is removed, the inside of the can is heated with a jacket while stirring, the temperature is maintained at 60℃, and chlorine gas is introduced. The reaction continues until the chlorine content is reached. After the reaction is complete, filter the slurry, wash the filter cake with an alkaline solution such as _NaHCO3 ,
It is further washed with water until it becomes neutral and dried 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 suspension polymerization, and has a degree of polymerization of 400 to 1350.
Preferably, the number is 500 to 1200. The amount of water used is 1 to 5 times, preferably 1 to 3 times, the amount of vinyl chloride resin. As the swelling agent for vinyl chloride resin, methyl chloride, dichloromethane, chloroform, carbon tetrachloride, 1,2-dichloroethane, tetrachloroethane, chlorobenzene, etc. are used alone or in combination. The amount used is vinyl chloride resin
The amount is 5.0 to 60.0 parts by weight per 100 parts by weight. As the dispersant, polyvinyl alcohol and partially saponified products thereof, methyl cellulose, ethyl cellulose, gelatin, etc. used in ordinary polymerization are used, and the amount used is 0.01 to 1.0 parts by weight. As a reaction catalyst, lauroyl peroxide, tert-butyl peroxypivalate,
Organic peroxides such as diisopropyl peroxydicarbonate and dioctyl peroxycarbonate; azo compounds such as 2,2'-azobisisobutyronitrile and 2,2'-azobis-2,4-dimethylvaleronitrile; Oil-soluble radical polymerization initiators and halogen compounds such as titanium tetrachloride, phosphorus pentachloride, antimony trichloride, and boron trifluoride are used. In addition, if no reaction solvent is used,
It is also possible to use light, ultraviolet rays, and gamma ray irradiation. When using an oil-soluble radical polymerization initiator, the amount used is 0.05 parts by weight per 100 parts by weight of vinyl chloride resin.
~1.0 parts by weight. The reaction temperature is 0 to 200°C, preferably 50 to 200°C.
It is 100℃. The reaction time is 1 to 15 hours, preferably 2 to 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 series, octyltin laurate series, octyltin malate laurate series,
Octyltin malate, octyltin mercapto, and methyltin mercapto may be used alone or in combination of two or more. The amount of tin stabilizer used is a mixture of vinyl chloride resin and chlorinated vinyl chloride resin.
Preferably 0.5 to 10 parts by weight per 100 parts by weight
If it is less than 10 parts by weight, the thermal stability will be insufficient, and if it exceeds 10 parts by weight, the effect of thermal stability will not change, which is economically disadvantageous. In addition, if necessary, fillers, lubricants, other resins, plasticizers, ultraviolet absorbers, antistatic agents, antioxidants, flame retardants,
Pigments etc. are blended. Calcium carbonate, talc, silica, clay, etc. can be used as fillers, but the average particle size is 1 μm.
Below, those having a diameter of 0.7 μm or less are preferably used. Examples of lubricants include hydrocarbon lubricants such as natural paraffin, liquid paraffin, and polyethylene wax;
Examples include fatty acid lubricants such as stearic acid, fatty acid amide lubricants such as stearamide, ester lubricants such as ethylene glycol monostearate, higher alcohol lubricants such as stearyl alcohol, and metal soap 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 workability. 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 of lubricant used is 0.5 to 5.0 parts by weight of the mixture of vinyl chloride resin and chlorinated vinyl chloride resin.
Part by weight is preferably 0.5 to 3.0 parts by weight.If it is less than 0.5 parts by weight, a large amount of frictional heat will be generated due to insufficient internal and external lubricity, and it will already gel in the compression zone of the extruder, causing an increase in viscosity and temperature, which will cause the resin to deteriorate. Causes decomposition and discoloration. Moreover, if it exceeds 5.0 parts by weight, the slipperiness is too strong, resulting in insufficient kneading and insufficient gelation, which is not preferable. Other resins that can be added include copolymers such as ethylene/vinyl acetate, methyl acrylate/butyl acrylate, methyl methacrylate/ethyl acrylate, methyl acrylate/butyl methacrylate, ethylene/vinyl acetate/vinyl chloride ternary copolymers, chlorinated polyethylene, and acrylonitrile. /butadiene/styrene ternary copolymer, methyl methacrylate/butadiene/styrene, methyl methacrylate/butyl acrylate/ethyl acrylate, methyl methacrylate/ethyl acrylate/acrylonitrile, methyl methacrylate/styrene/butyl acrylate, etc. ternary copolymer, methyl methacrylate/butyl methacrylate /Ethyl acrylate/
Any resin that is compatible with PVC, such as ethyl methacrylate quaternary copolymer, may be added as long as it does not impair the physical properties of the composition of the present invention. Examples of plasticizers include phthalate esters, trimellitic acid esters, adipate esters, phosphate plasticizers, epoxy plasticizers, and polyester plasticizers. As ultraviolet absorbers, benzophenones such as 2,4-dihydroxybenzophenone, 2-(2'-
Examples include benzotriazole-based UV absorbers such as 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 antioxidants, bisphenols such as 2,2'-methylene-bis-(4-methyl-6-tert-butylphenol), monophenols such as 2,6-di-tert-butylphenol,
Examples include hydroquinone antioxidants such as 2,5-ditertiarybutylhydroquinone. Examples of flame retardants include known halides such as chlorinated paraffin, chlorinated polyethylene, perchloropentacyclodecane, hexabromobenzene, decabromodiphenyl ether, and tetrabromobisphenol A, antimony trioxide, antimonates, Examples include inorganic compounds such as barium metaborate, zinc borate, and aluminum hydroxide. Pigments include barium sulfate, calcium carbonate, zinc oxide, titanium oxide, iron oxide,
Both inorganic pigments such as chromium oxide, silica, mica, talc, carbon black and organic pigments such as diazo yellow, Laked C, phthalocyanine blue or green can be used, and other colorants such as dyes can also be used. can. 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. Vinyl chloride resin is made by graft copolymerizing 99 to 70 parts by weight of vinyl chloride to 1 to 30 parts by weight of an acrylic copolymer so that the melt viscosity matches that of the vinyl chloride resin composition, and the chlorine content is 58%.
Mainly contains ~70% chlorinated vinyl chloride resin, organotin stabilizer, and pigment. The vinyl chloride resin composition of the present invention can be blended to a desired melt viscosity and mixed uniformly by a known method using a Henschel mixer, ribbon blender, etc., to form a powder. (Effects of the Invention) When using the vinyl chloride resin composition of the present invention, for example, powder or pellets, the vinyl chloride resin is prepared by graft copolymerizing 99 to 70 parts by weight of vinyl chloride to 1 to 30 parts by weight of an acrylic copolymer. Single-screw extruder, twin-screw extruder, or multi-screw extruder can be used to produce building materials such as window frames and decking materials using the same mold as when using powder or pellets mainly containing lead-based stabilizers and titanium white. Can be molded using a machine. The vinyl chloride resin composition of the present invention has excellent weather resistance and impact resistance, and is particularly suitable for molding colored products. (Examples) Hereinafter, the present invention will be explained more specifically based on Examples. Example 1 2700 kg of deionized water and partially saponified polyvinyl alcohol were placed in a polymerization machine with an internal volume of 7 m ³ equipped with a stirring blade.
2.05Kg, methylcellulose 2.05Kg, 2,2'-azobisisobutyronitrile 0.075Kg, 2,2'-azobis-2,4-dimethylvaleronitrile 0.24Kg and n-butyl acrylate 97% by weight and 1,3 - After charging 600 kg of acrylic copolymer latex with a composition of 3% by weight of butylene glycol dimethacrylate and removing the air inside, 1410 kg of vinyl chloride was charged and after melting at 35°C for 1 hour, 57℃
After 10 hours from the start of polymerization, the internal pressure of the polymerization machine was reduced to 6.5 kg/cm ² , so the unreacted monomer was collected and the slurry was dehydrated and dried, yielding 1275 kg of white powder resin. The degree of polymerization of this resin is
1030, the content of components other than vinyl chloride is 7.0% by weight
It was hot. To 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) was added to the tin-based stabilizer IRGASTAB T-633 manufactured by Ciba Geigy (product name). name) 3 parts by weight, lubricant Paraffin Wax 155 (product name) manufactured by Nippon Seiwa 0.4 parts by weight, lubricant Hi-wax 450P (product name) manufactured by Mitsui Petrochemicals Co., Ltd. 0.2 parts by weight, processing aid PA20 manufactured by Kanebuchi Chemical Co., Ltd. (Product name) 1.0 parts by weight, ultraviolet absorber TINUVIN320 manufactured by Ciba Geigy
(Product name) 0.3 parts by weight, Ciba-Geigy antioxidant IRGANOX1076 (Product name) 0.1 parts by weight, Ciba-Geigy
Geigy pigment MIKROLITH brown
5RKP (product name) 0.7 parts by weight, MIKROLITH blue
A powder was prepared using a formulation of 0.07 parts by weight of 4GKP (trade name). For mixing, the graft copolymer resin and compounding agents were charged into a Henschel mixer, heated to 120°C while stirring, cooled to below 40°C, and then discharged. Using this powder, the melt viscosity was measured using a Brabender Plastograph and was 4.0Kg・m.
It was hot. Also, this powder and φ30mm different direction 2
Extrusion molding was performed using a screw extruder (manufactured by Plastic Engineering Research Institute). The molding conditions and results are shown in Table 1. Reference Example 1 To 100 parts by weight of the graft copolymer resin obtained in the same manner as in Example 1, 2 parts by weight of tribasic lead sulfate, 2 parts by weight of dibasic lead phosphite, a pigment manufactured by Ishihara Sangyo Co., Ltd.
Titanium white R-650 (trade name) 3 parts by weight, Ca stearate 0.4 parts by weight, stearic acid 0.4 parts by weight, Henkel lubricant Loxiol G-60 (trade name) 0.4 parts by weight,
Loxiol G-30 (trade name) 0.4 parts by weight, PA-20 1.0
Weight part: Calcium carbonate Hakuenka manufactured by Shiraishi Kogyo Co., Ltd.
A powder was prepared using a formulation of 5 parts by weight of CCR (trade name). The powder was mixed in the same manner as in Example 1, and the melt viscosity of this powder was measured using a Brabender Plastograph and found to be 4.0 Kg·m. In addition, extrusion molding was performed using this powder using a φ30 mm twin screw extruder in different directions. The conditions and results are shown in Table 1. Comparative Example 1 Powder was prepared in the same manner as in Example 1, except that the 75 parts by weight of the graft copolymer resin in Example 1 was changed to 100 parts by weight, and the addition of 25 parts by weight of chlorinated vinyl chloride resin with a chlorine content of 65% was discontinued. The melt viscosity of this powder was measured using a Brabender plastograph and found to be 3.6 kg·m. Also,
This powder was extruded using a φ30 mm twin screw extruder in different directions. The molding conditions and results are shown in Table 1. The Brabender Plastograph (Brabender Co., Ltd.) conditions employed in each of the above Examples, Reference Examples, and Comparative Examples are as follows. Kneader 50c.c. Temperature: 150℃ Rotation speed: 50rpm Sample amount: 65g Mixture: Lead-based or tin-based Weight: 10kg Preheating: 3 minutes As is clear from the results in Table 1, the melt viscosity was adjusted using a brush bender plastograph. The composition of the present invention could be extruded under the same mold conditions as the composition containing a lead-based stabilizer and TiO ₂ , and the resulting product had good surface condition and shape.

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Claims (1)

[Scope of Claims] 1 (a) 99 to 60% by weight of an alkyl acrylate and/or alkyl methacrylate whose homopolymer has a second-order transition temperature of -10°C or lower and a homopolymer whose second-order transition temperature is 0°C or higher Monomers 1 to 40 that are
45-95% by weight of vinyl chloride resin and 55-5% by weight of chlorinated vinyl chloride resin obtained by graft copolymerizing 99-70 parts by weight of vinyl chloride with 1-30 parts by weight of acrylic copolymer. 1. A vinyl chloride resin composition with excellent processability, characterized in that (b) 0.5 to 10.0 parts by weight of an organotin stabilizer is blended with 100 parts by weight of a mixture containing the following.