JPH11217476A - Vinyl chloride resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vinyl chloride resin composition which can give a rigid molding having high woody appearance and improved impact strength and suited for construction materials such as sashes and furniture. SOLUTION: There is provided with a vinyl chloride resin composition comprising (A) 100 pts.wt. vinyl chloride resin, (B) 5-150 pts.wt. wood flour having a mean particle diameter of 50-500 μm, (C) 2-50 wt.%, based on component B, polyvinyl alcohol having a degree of saponification of 70 mol.% or above at 20 deg.C and having a viscosity of 25-95 cP as measured in a 4 wt.% aqueous solution, and (D) 5-20 pts.wt. impact-resistant impact modifier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vinyl chloride resin composition containing a large amount of wood flour. More specifically, the present invention relates to a hard vinyl chloride-based resin composition capable of providing a molded article rich in woody feel, suitable for building materials, and having improved mechanical strength.

[0002]

2. Description of the Related Art In recent years, a method of blending wood powder with a vinyl chloride resin has been used for the purpose of producing an appearance and feel similar to wood. However, a vinyl chloride resin molded product containing a considerable amount of wood powder has a problem that the mechanical strength such as tensile strength and impact strength is not sufficient.

[0003] In order to improve the clarity and ease of processing of wood grain, a vinyl chloride resin composition in which a urea resin is added in addition to wood flour has been proposed (Japanese Patent Application Laid-Open No. Sho 60-42007, JP-A-60-73807, JP-A-60-73
808). In addition, a vinyl chloride resin composition obtained by adding an inorganic filler such as mica in addition to wood flour and polyethylene, ethylene-vinyl acetate copolymer or ABS resin has a low coefficient of linear expansion, impact resistance and moldability. (JP-A-60-192746,
JP-A-60-192747). However, these also lack the uniform mixing property of wood flour and the appearance of the woody texture of the molded product is insufficient. By blending wood powder to which inorganic powder or plastic powder is attached at the time of plastic processing, the uniform dispersibility of wood powder is greatly improved (JP-A-5-177610, JP-A-5-261708).
Simply blending such wood flour into a vinyl chloride-based resin has made it difficult to extrude a molded product rich in wood texture, especially a molded product having satisfactory impact resistance. That is, especially in the case of a hard compound having a large amount of wood powder, even when an impact-resistant reinforcing agent is added, the wood powder is often released from the continuous resin layer, and when stress is applied, a crack surface is formed at the wood powder interface. Easily occurred. Therefore, the appearance of a hard vinyl chloride-based resin composition which can provide a hard molded product having a high content of wood flour and improved impact strength has been awaited.

[0004]

SUMMARY OF THE INVENTION In view of the above situation, an object of the present invention is to provide a hard molded product which is suitable for building materials such as window frames and furniture, and which is rich in woodiness and has improved impact strength. To provide a vinyl chloride-based resin composition that can be used.

[0005]

Means for Solving the Problems The present inventors have solved the above-mentioned problems by attaining the above object by blending a specific polyvinyl alcohol and an impact-resistant reinforcing agent together with wood powder in a vinyl chloride resin. The present invention was completed based on this finding. That is, the present invention provides (1) (A) 100 parts by weight of a vinyl chloride resin,
(B) 5 to 150 parts by weight of wood powder having an average particle size of 50 to 500 μm, and (C) polyvinyl alcohol having a saponification degree of 70 mol% or more and a 4% by weight aqueous solution at a temperature of 20 ° C. having a viscosity of 25 to 95 cps. (2) (A) 100 parts by weight of a vinyl chloride-based resin, which comprises 2 to 50% by weight of the components and (D) 5 to 20 parts by weight of an impact-resistant reinforcing agent; (B) Average particle size 50 to 500
5-150 parts by weight of wood powder of (μm), (C) viscosity of a 4% by weight aqueous solution at a temperature of 20 ° C. with a saponification degree of 70 mol% or more is 2
5 to 95 cps of polyvinyl alcohol in an amount of 2 to 50% of the weight of the component (B) and (D)
A vinyl chloride resin extruded product containing 20 parts by weight.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The vinyl chloride resin used as the component (A) in the composition of the present invention includes, in addition to a vinyl chloride homopolymer,
Copolymers containing 50% by weight or more, preferably 70% by weight or more of vinyl chloride units are included. Examples of the comonomer in the case of the vinyl chloride copolymer include olefins such as ethylene and propylene; allyl chloride, vinylidene chloride,
Halogenated olefins such as vinyl fluoride and ethylene trifluoride chloride; carboxylic acid vinyl esters such as vinyl acetate and vinyl propionate; vinyl ethers such as isobutyl vinyl ether and cetyl vinyl ether; allyl-3-chloro-2-oxypropyl Ethers, allyl ethers such as allyl glycidyl ether; unsaturated carboxylic acids such as acrylic acid, maleic acid, itaconic acid, 2-hydroxyethyl acrylate, methyl methacrylate, monomethyl maleate, diethyl maleate, and maleic anhydride; Esters or acid anhydrides thereof;
Unsaturated nitriles such as acrylonitrile and methacrylonitrile; acrylamides such as acrylamide, N-methylolacrylamide, acrylamide-2-methylpropanesulfonic acid, (meth) acrylamidopropyltrimethylammonium chloride; allylamine benzoate and diallyldimethylammonium chloride And derivatives thereof. The monomers exemplified above are only a part of the copolymerizable monomers, and are described in "Polyvinyl Chloride" edited by Kinki Chemical Society Vinyl Subcommittee, Nikkan Kogyo Shimbun (1988) 75-1.
Various monomers exemplified on page 04 can be used. Also, ethylene-vinyl acetate copolymer, ethylene-
Resins such as methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, chlorinated polyethylene, and the like, also include resins obtained by graft-polymerizing vinyl chloride or the above-mentioned copolymerizable monomer with vinyl chloride.

[0007] These vinyl chloride resins are prepared by suspension polymerization,
It may be produced by any conventionally known production method such as emulsion polymerization, solution polymerization and bulk polymerization. The average degree of polymerization of the vinyl chloride resin is preferably from 400 to 1,500, more preferably from 600 to 1,100, as determined by the measurement method specified in JIS K 6721. Average degree of polymerization of vinyl chloride resin is 400
If it is smaller, the foaming ratio tends to be hardly increased. Conversely, if it is larger than 1,500, many coarse cells may be mixed in the foam cells.

In the present invention, as the component (B), wood powder having an average particle size of 50 to 500 μm is contained in an amount of 5 to 150 parts by weight, preferably 35 to 120 parts by weight, per 100 parts by weight of the vinyl chloride resin (A). Preferably, it is used in an amount of 40 to 100 parts by weight. If the amount of the wood flour is less than 5 parts by weight, it is difficult for the molded article to exhibit a woody feeling, and if it exceeds 150 parts by weight, the molded article becomes brittle. The tree species of the wood flour used in the present invention is not particularly limited, and coniferous or hardwood wood pieces such as cedar, hemlock and lauan, and wood such as planing and sawdust can be used. In order to obtain the component (B) of the present invention from these woods, for example, the woods are milled with a pulverizer to have an average particle size of 500 μm.
m or less wood flour is preferred. Wood flour used in the present invention is disclosed in JP-A-5-177610 and JP-A-5-177610.
Wood powder having hard small particles adhered to the surface as disclosed in JP-A-261708 may be used. As the hard small particles, particles having a hardness higher than that of wood flour and an average particle size smaller than the average particle size of wood flour are used. Specific examples include metals, metal oxides and metal salts, inorganic compounds, and plastic particles. Preferred small particles are inorganic or metallic particles such as titanium oxide, nickel, calcium carbonate, silica, and mica. The mode in which the hard small particles adhere to the surface of the wood flour includes hard small particles such as an entanglement bond including biting of the hard small particles into the wood flour, and a pinch bond between a plurality of hard small particles that have been bitten bonded. Adhesion by pressing against the surface of the wood powder may be applied, or hard small particles may be attached to the wood powder by an adhesive. In this case, for example, the wood flour is charged into a ball mill together with 1 to 50% by weight of hard small particles,
A method of treating under a condition in which dust explosion is prevented, such as under a nitrogen atmosphere, can be performed.

The average particle size of the component (B) used in the present invention is 50 to 500 μm, preferably 30 to 100 μm. Here, the average particle diameter means a reading of the value of the mesh corresponding to 50% by weight of a curve obtained by analyzing the powder by sieve analysis to obtain a cumulative weight% curve with respect to the mesh. Component (B) has an average particle size of 50 μm.
If it is less than m, the bulk specific gravity becomes small and the mixing operability for preparing the composition becomes poor, and if it is more than 500 μm, the surface of the molded article becomes rough and voids are liable to occur.
The water content of the component (B) is preferably at most 10% by weight, more preferably at most 5% by weight. In the composition of the present invention, polyvinyl alcohol is used as the component (C). Polyvinyl alcohol has an effect of adsorbing to the wood powder of the component (B) to make the wood powder easily compatible with the vinyl chloride resin of the matrix. The polyvinyl alcohol as the component (C) is usually obtained by saponifying polyvinyl acetate, and the saponification degree needs to be 70 mol% or more, and preferably 75 to 100 mol%. If the saponification degree is smaller than 70 mol%, it is difficult to adsorb to wood powder, and the impact strength may be reduced.

The viscosity of a 4% by weight aqueous solution, which is an index of the average degree of polymerization of the polyvinyl alcohol of the component (C), is 20 ° C.
It is necessary that the temperature be 25 to 95 cps at C, and preferably 30 to 85 cps. If the viscosity of the 4% by weight aqueous solution of polyvinyl alcohol is less than 25 cps, that is, if the molecular weight is too small, interaction with the impact-resistant reinforcing agent is difficult to occur. The surface may lack smoothness. Further, as the component (C) of the composition of the present invention, polyvinyl alcohol having the above-mentioned saponification degree and aqueous solution viscosity in the range of carboxyl modification, cation modification or acetoacetyl modification can be used in the same manner. . The compounding amount of the component (C) is preferably 2 to 50% of the weight of the wood flour of the component (B), and is 5 to 30%.
% Is more preferable. When the amount of the component (C) is less than 2% of the weight of the component (B), the interaction with the impact-resistant reinforcing agent becomes difficult to develop, and there is a risk that the impact strength is not improved. On the other hand, when the amount of the component (C) is more than 50% of the weight of the component (B), the composition becomes water-absorbing, and there is a possibility that bubbles may be generated in a molded product.

As a method for using the polyvinyl alcohol as the component (C), it is preferable to adopt a method in which the polyvinyl alcohol is previously adsorbed to the wood powder of the component (B) and then mixed with the vinyl chloride resin as the component (A). To adsorb polyvinyl alcohol to wood flour, for example, wood flour is put into a Henschel mixer and heated with steam through a jacket while stirring at high speed. When the internal temperature rises to about 70 ° C., a predetermined amount of polyvinyl alcohol 2 -10 wt% aqueous solution is added little by little,
There is a method of vaporizing water vapor while continuously raising the temperature, and cooling when the temperature reaches about 130 ° C. According to this method, the water content can be reduced to about 1% by weight as the water content of the wood flour.

In the composition of the present invention, an impact modifier is used as a component (D) in order to improve the impact resistance of the molded article. Examples of such impact modifiers include acrylonitrile-butadiene-styrene copolymer (ABS) and methyl methacrylate-butadiene-styrene copolymer (MB).
S), an acrylic resin-based impact modifier, and a known impact modifier for vinyl chloride resins such as chlorinated polyethylene are used. The impact resistance enhancer of the component (D) has an effect of improving the impact resistance by itself when added to a vinyl chloride resin composition containing wood flour.
In the present invention, the impact resistance is particularly improved in combination with the addition of the polyvinyl alcohol as the component (C). The amount of the component (D) is preferably 5 to 20 parts by weight, more preferably 7 to 15 parts by weight, per 100 parts by weight of the vinyl chloride resin of the component (A).
If the amount of the component (D) is less than 5 parts by weight, it is difficult to improve the impact strength of the molded product. On the other hand, if the amount is more than 20 parts by weight, the impact strength is not improved and the tensile strength is not increased. May be greatly reduced.

The composition of the present invention contains, in addition to the above-mentioned components, a heat stabilizer used in the processing of an ordinary vinyl chloride resin, a lubricant, a processing aid, a compatibilizer, an ultraviolet absorber, and a pigment. , A filler, a foaming agent, an antistatic agent, a plasticizer, and the like can be appropriately added. Lubricants include lithium stearate, magnesium stearate, aluminum stearate, calcium stearate, strontium stearate, barium stearate, calcium laurate, barium laurate, barium 2-ethylhexoate, barium ricinoleate, zinc stearate, naphthenic acid Metal soaps such as zinc, cadmium laurate, lead stearate, dibasic lead phthalate; n
-Fatty acid esters such as butyl stearate, methylhydroxystearate, polyhydric alcohol fatty acid esters, ester waxes; fatty acids such as stearic acid and hydroxystearic acid; stearamide, oxystearamide, oleylamide, behenamide, methylenebis Amide compounds such as stearoamide, ethylenebisstearamide, N, N'-distearylsuccinamide; inorganic acid salts such as tribasic sulfate, basic lead sulfite, and dibasic lead phosphite; One or more selected from polyethylene wax and the like are used. The amount used is usually the vinyl chloride resin 1 of the component (A).
0.2 to 10 parts by weight per 100 parts by weight.

As the processing aid, a known methyl methacrylate polymer can be preferably used. Such a methyl methacrylate processing aid is a copolymer containing 60% by weight or more, preferably 65 to 90% by weight of a methyl methacrylate unit. Further, the specific viscosity which is an index of the molecular weight of the methyl methacrylate resin-based processing aid, that is, the specific viscosity is 0.1%.
25 ml of chloroform solution 100 ml dissolved 2 gr
Is preferably 0.3 to 1.0. Examples of commercial products of such a methyl methacrylate resin-based processing aid include Hybrene B manufactured by Nippon Seon Co., Ltd.
401, P-551 manufactured by Mitsubishi Rayon Co., Ltd., Kaneace PA-11 manufactured by Kanegafuchi Chemical Co., Ltd., Kureha HIA-15 manufactured by Kureha Chemical Industry Co., Ltd., and the like. The amount of the processing aid is usually 0.2 to 5 parts by weight per 100 parts by weight of the vinyl chloride resin as the component (A). As the compatibilizer in the vinyl chloride resin and wood flour system, epoxy group-containing vinyl chloride resin, epoxy group-containing methyl methacrylate resin, epoxy group-containing acetonitrile-methyl methacrylate copolymer, oxazoline group-containing vinyl chloride resin,
Oxazoline group-containing methyl methacrylate resin, oxazoline group-containing acetonitrile-methyl methacrylate copolymer and the like are preferred.

In order to prepare the composition of the present invention, first, as described above, the polyvinyl alcohol of the component (C) is converted into an aqueous solution, and the wood powder of the component (B) is adsorbed in advance and dried. This is put into a mixer such as a Henschel mixer together with the components (A) and (D). The mixed components put in the mixer are stirred vigorously for 120-160.
Heat to ° C. In this mixing process, the moisture absorbed in the wood flour is volatilized. When the above temperature is reached, the mixture is transferred to a cooling mixer and cooled. The extracted powdery mixture can be used as a molding compound as it is, but may be pelletized. As a preferable method for producing pellets, a twin-screw extruder is used,
And a method of producing pellets while discharging residual moisture in wood flour from a vent hole.

The molding method for obtaining a hard vinyl chloride resin molded article similar to natural wood using the composition of the present invention is not particularly limited, but the above powdery compound or pellet is usually subjected to an extruder. Molding. As the conditions for the extrusion molding, the same conditions as in the extrusion molding of a general hard vinyl chloride resin are employed. The extruded product thus obtained has a sufficiently large mechanical strength because the continuous layer of the vinyl chloride resin is adapted to the wood flour. The form of the extruded product may be in accordance with the use such as a building material or a furniture material, and generally includes a plate shape, a sheet shape, a prism shape, a column shape, and a deformed shape.

Next, various embodiments of the invention of the vinyl chloride resin composition of the present invention will be described. (1) (A) 100 parts by weight of a vinyl chloride resin, (B) 5-150 parts by weight of wood powder having an average particle size of 50 to 500 μm,
(C) 4 at a temperature of 20 ° C. with a degree of saponification of 70 mol% or more.
A vinyl chloride resin composition comprising polyvinyl alcohol having a viscosity of 25 to 95 cps by weight of an aqueous solution containing 2 to 50% by weight of the component (B) and 5 to 20 parts by weight of an impact-resistant reinforcing agent (D). . (2) The average degree of polymerization of the vinyl chloride resin (A) is 400 to
The vinyl chloride resin composition according to the above (1), which is 1,500.

(3) Component (C) The vinyl chloride resin composition according to the above (1) or (2), wherein the polyvinyl alcohol has a saponification degree of 75 to 100 mol%. (4) The vinyl chloride resin composition according to any one of the above (1) to (3), wherein the content of the wood powder (B) having an average particle size of 50 to 500 μm is 25 to 120 parts by weight. (5) The amount of the component (C) is 5 to 5 times the weight of the component (B).
The vinyl chloride resin composition according to any one of the above (1) to (4), wherein the amount is 30%. (6) In addition to the components (A), (B), (C), and (D), 0.2 to 10 parts by weight of the lubricant (E) and (F) per 100 parts by weight of the vinyl resin (A). (5) The vinyl chloride resin composition according to any one of the above (1) to (5), comprising 0.2 to 5 parts by weight of a processing aid. (7) (A) 100 parts by weight of vinyl chloride resin, (B) 5-150 parts by weight of wood powder having an average particle size of 50 to 500 μm,
(C) 4 at a temperature of 20 ° C. with a degree of saponification of 70 mol% or more.
Extrusion molding of polyvinyl chloride resin containing polyvinyl alcohol having a viscosity of 25 to 95 cps by weight of an aqueous solution containing 2 to 50% of the weight of component (B) and 5 to 20 parts by weight of (D) impact modifier. Goods.

[0019]

EXAMPLES The vinyl chloride resin composition of the present invention will be specifically described below with reference to Examples and Comparative Examples.
The present invention is not limited to these examples. Parts and percentages are by weight unless otherwise specified. The characteristic evaluation was performed by the following method. (1) Impact Strength The Charpy impact strength was measured using a No. 5 test piece in accordance with JIS K 7111. (2) Tensile strength In accordance with JIS K 7113, the tensile strength was measured using a No. 1 test piece at a tensile speed of 10 mm / min. (3) Surface Properties of Molded Product The surface of the molded product is visually observed and touched, and evaluated according to the following four grades. A: Smooth B: Shark skin C: Many granular protrusions

Examples 1 to 4 and Comparative Examples 1 to 5 In each of Examples except Comparative Examples 1 and 5, an aqueous solution having a concentration of 5% by weight using the amount of polyvinyl alcohol shown in Table 1 (however, Comparative Example 4 is water And an equal weight solution of ethanol and ethanol) are prepared in advance. First, a predetermined amount of wood flour is put into a Henschel mixer (however, except for Comparative Examples 1 and 5), and steam is passed through a jacket with vigorous stirring to raise the temperature. When the internal temperature reached 65 ° C., the temperature was continuously increased while the previously prepared aqueous solution of polyvinyl alcohol was added in small increments, and when the temperature reached 130 ° C., the polyvinyl alcohol was adsorbed by cooling. Wood flour (moisture content 0.8-1.1% by weight) was obtained. Then, each kind of component and amount shown in Table 1 were blended by a Henschel mixer in the following manner.

A vinyl chloride resin, wood flour adsorbing polyvinyl alcohol (only wood flour in Comparative Examples 1 and 5), an impact resistance enhancer, a heat stabilizer, a lubricant, and a processing aid are charged and mixed. The water remaining in the wood flour (water and methanol in Comparative Example 4) was volatilized. When the temperature rose to 140 ° C., the mixture was transferred to a cooling mixer and cooled to room temperature. The obtained powdery mixture was formed into pellets under the following conditions using a single screw extruder having a cylinder diameter of 65 mm. Screw: L / D = 24, compression ratio 2.5, rotation speed 30 rpm Set temperature: C1 = 140 ° C., C2 = 150 ° C., C3 = 160 ° C. C4 = 170 ° C., head 170 ° C., die 170 ° C. dice: 3 mmφ pellet × 12 holes Land length: 10mm

The pellets thus obtained were extruded by a single screw extruder having a cylinder diameter of 65 mm under the following conditions. Table 1 shows the characteristics of the molded product. Screw: L / D = 24, compression ratio 2.5, rotation speed 30 rpm Set temperature: C1 = 160 ° C., C2 = 170 ° C., C3 = 175 ° C. C4 = 180 ° C., head 180 ° C., D1 = 180 ° C. D2 = 180 ℃ Dice: 4mm thick x 50mm belt Land length: 10mm

[0023]

[Table 1]

Note * 1 ZEST 700L, manufactured by Shin Daiichi Vinyl Co., Ltd., vinyl chloride resin, average degree of polymerization 680. * 2 Celluunt, manufactured by Shimada Shokai Co., Ltd., wood flour, average particle size 80 μm, moisture 5% by weight. * 3 Gohsenol KH-20, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., having a saponification degree of 78.5 to 81.5 mol% and a viscosity of a 4% by weight aqueous solution of 78.5 to 81.5 cps. * 4 Gohsenol NH-20, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., having a saponification degree of 98.5 to 99.4 mol% and a viscosity of a 4% by weight aqueous solution of 35 to 43 cps. * 5 Gohsenol KP-08, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., having a saponification degree of 71.0 to 75.0 mol% and a viscosity of a 4% by weight aqueous solution of 6 to 9 cps. * 6 Gosefimer L-7514, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., having a saponification degree of 30 to 40 mol% and being insoluble in water, 4
Unable to measure viscosity of weight% aqueous solution * 7 Kane Ace FM-20, manufactured by Kanegafuchi Chemical Industry Co., Ltd.
Acrylic resin impact modifier. * 8 Kane Ace B-56, manufactured by Kanegafuchi Chemical Industry Co., Ltd., M
BS-based impact modifier. * 9 Elaslen 301A, manufactured by Showa Denko KK, amorphous chlorinated polyethylene, chlorine content 30%, Mooney viscosity 70 (MS _{1 + 4} 100 ° C). * 10 Hybrene B401, manufactured by Zeon Corporation, methyl methacrylate resin-based processing aid. * 11 Plastic additive KS-4C, manufactured by Kyodo Yakuhin, tin-based heat stabilizer. * 12 Riquelter SL02, manufactured by Riken Vitamin Co., Ltd.
Fatty acid ester lubricant. * 13 LOXIOL G60, manufactured by Henkel Japan KK, fatty acid (dibasic acid) ester lubricant. * 14 LOXIOL G21, a higher fatty acid lubricant manufactured by Henkel Japan Co., Ltd. * 15 Carbon black [TPH0012, manufactured by Toyo Ink Mfg. Co., Ltd.] / Condensed azo red (TXH4360,
Company pigment) / Bisazo Yellow (TXH2110, Company) composite pigment

Using the compositions of various formulations, a thickness of 4 mm,
A hard flat plate having a width of 50 mm was extruded and comparatively evaluated.
In all cases, molded articles having a woody appearance were obtained.
However, only in the case of Comparative Example 4, small shank-like undulations were observed on the surface. In each of Examples 1 to 4 molded using the composition having the requirements of the present invention, the impact strength was twice or more as compared with Comparative Example 1 in which the polyvinyl alcohol as the component (C) was not added. Although it was large, the tensile strength showed a sufficiently large value although the durability was lowered, and a molded product having good surface properties was obtained. However, each comparative example molded using a composition that did not satisfy the requirements of the present invention gave a molded article having low impact strength. Comparative Example 2 in which no impact modifier was added, and Comparative Examples 30 and 4 in which polyvinyl alcohol was used outside of the scope of the present invention even when an impact modifier was added, had a completely higher impact strength than Comparative Example 1. Did not improve. In addition, Comparative Example 5 in which polyvinyl alcohol was not added even when the impact resistance enhancer was blended showed a slightly improved impact resistance value.

[0026]

By using the composition of the present invention, it is possible to obtain a hard vinyl chloride resin molded article which is rich in woodiness, is suitable for building materials, and has greatly improved impact strength.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 55:00) (72) Inventor Toshiya Kobayashi 1-1-2, Yakko, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Zeon Chemical Co., Ltd. Kawasaki Laboratory

Claims (2)

[Claims] (A) 100 parts by weight of a vinyl chloride resin,
(B) 5 to 150 parts by weight of wood powder having an average particle size of 50 to 500 μm, and (C) polyvinyl alcohol having a saponification degree of 70 mol% or more and a 4% by weight aqueous solution at a temperature of 20 ° C. having a viscosity of 25 to 95 cps. A vinyl chloride resin composition comprising 2 to 50% by weight of the components and (D) 5 to 20 parts by weight of an impact modifier. (A) 100 parts by weight of a vinyl chloride resin,
(B) 5 to 150 parts by weight of wood powder having an average particle size of 50 to 500 μm, and (C) polyvinyl alcohol having a saponification degree of 70 mol% or more and a 4% by weight aqueous solution at a temperature of 20 ° C. having a viscosity of 25 to 95 cps. An extruded vinyl chloride resin comprising 2 to 50% by weight of the components and (D) 5 to 20 parts by weight of an impact modifier.