RESIN COMPOSITION FOR MOLDING

Abstract

The present invention provides a resin composition for molding capable of producing a molded article that has excellent heat distortion resistance, excellent mechanical properties, high impact resistance, and high transparency and has a smaller change in weight at high temperature. The present invention also provides a molded article and a joint each produced from the resin composition for molding. Provided is a resin composition for molding, including: a chlorinated polyvinyl chloride resin; a polyvinyl chloride; and a thermal stabilizer, the chlorinated polyvinyl chloride resin containing structural units (a) to (c) represented by the following formulas (a) to (c) in proportions of 5 to 90 mol % of the structural unit (a), 5 to 40 mol % of the structural unit (b), and 5 to 55 mol % of the structural unit (c) based on a total number of moles of the structural units (a), (b), and (c), the polyvinyl chloride being contained in an amount of 1 to 30 parts by mass based on 100 parts by mass of the chlorinated polyvinyl chloride resin,

[Chem. 1]

—CH.sub.2—CHC1-  (a)

—CH.sub.2—CC1.sub.2-  (b)

—CHC1-CHC1-  (c).

Claims

1. A resin composition for molding, comprising: a chlorinated polyvinyl chloride resin; a polyvinyl chloride; and a thermal stabilizer, the chlorinated polyvinyl chloride resin containing structural units (a) to (c) represented by the following formulas (a) to (c) in proportions of 5 to 90 mol % of the structural unit (a), 5 to 40 mol % of the structural unit (b), and 5 to 55 mol % of the structural unit (c) based on a total number of moles of the structural units (a), (b), and (c), the polyvinyl chloride being contained in an amount of 1 to 30 parts by mass based on 100 parts by mass of the chlorinated polyvinyl chloride resin,
[Chem. 1]
—CH.sub.2—CHC1-  (a)
—CH.sub.2—CC1.sub.2—  (b)
—CHC1-CHC1-  (c).

2. The resin composition for molding according to claim 1, further comprising diene rubber particles.

3. The resin composition for molding according to claim 2, wherein the diene rubber particles have an average particle size of 0.001 to 1.0 m.

4. The resin composition for molding according to claim 1, further comprising a lubricant.

5. The resin composition for molding according to claim 4, wherein the lubricant comprises a low-melting-point lubricant having a melting point of 80° C. or lower and a high-melting-point lubricant having a melting point of higher than 80° C.

6. The resin composition for molding according to claim 1, comprising a thermal stabilizer in an amount of 0.4 to 10 parts by mass based on 100 parts by mass of the chlorinated polyvinyl chloride resin.

7. A molded article molded from the resin composition for molding according to claim 1.

8. A joint molded from the resin composition for molding according to claim 1.

9. The joint according to claim 8, which is transparent.

Description

DESCRIPTION OF EMBODIMENTS

[0168] The present invention is more specifically described in the following with reference to, but not limited to, examples.

Example 1

[0169] A glass-lined reaction vessel having an inner capacity of 300 L was charged with 130 kg of deionized water and 50 kg of a polyvinyl chloride having an average degree of polymerization of 800. They were stirred to disperse the polyvinyl chloride in water to prepare an aqueous suspension, and then the inside of the reaction vessel was heated to raise the temperature of the aqueous suspension to 100° C. Subsequently, the inside of the reaction vessel was depressurized to remove oxygen (oxygen content 100 ppm). Thereafter, while stirring was performed with a stirring blade such that the vortex formed at the liquid-gas interface by stirring had a vortex volume of 8.3 L, chlorine (oxygen content 50 ppm) was introduced at a partial pressure of chlorine of 0.40 MPa, thereby starting thermal chlorination.

[0170] Then, the chlorination temperature was kept at 100° C. and the partial pressure of chlorine was kept at 0.40 MPa. After the amount of added chlorine reached 4.2% by mass, addition of a 200 ppm hydrogen peroxide solution was started at 15 ppm/Hr in terms of hydrogen peroxide relative to the polyvinyl chloride, and the average chlorine consumption rate was adjusted to 0.02 kg/PVC-kg.Math.5 min. Thereafter, when the amount of added chlorine reached 10.5% by mass, the supply of hydrogen peroxide solution and chlorine gas was terminated, whereby chlorination was terminated.

[0171] Subsequently, unreacted chlorine was removed by nitrogen gas aeration, and the obtained chlorinated polyvinyl chloride resin slurry was neutralized with sodium hydroxide, washed with water, dehydrated, and then dried. Thus, a powdery, thermally chlorinated polyvinyl chloride resin (amount of added chlorine: 10.5% by mass) was obtained.

(Preparation of Chlorinated Polyvinyl Chloride Resin Composition)

[0172] To 100 parts by mass of a chlorinated polyvinyl chloride resin (A) [amount of added chlorine: 10.5% by mass, degree of polymerization: 800] was added 3.0 parts by mass of a butyltin mercaptan compound (TVS #1360, available from Nitto Kasei Co., Ltd.) as a thermal stabilizer. Further, 10.0 parts by mass of methyl methacrylate-butadiene-styrene copolymer (MBS) resin particles as diene rubber particles and 8.5 parts by mass of a polyvinyl chloride (chlorine content: 56.8% by mass, degree of polymerization: 700, glass transition temperature: 87° C.) were added and blended. The MBS resin particles used had an average particle size of 0.105 μm, a refractive index of 1.542, a refractive index/amount of added chlorine of 0.148, and a specific gravity of 1.00.

[0173] To the mixture were further added 0.5 parts by mass of polyethylene oxide wax, 1.5 parts by mass of 2,3-dihydroxypropyl octadecanoate, and 1.0 parts by mass of dipentaerythritol fatty acid ester. The polyethylene oxide wax, 2,3-dihydroxypropyl octadecanoate, and dipentaerythritol fatty acid ester used were listed below.

[0174] polyethylene oxide wax: Hiwax4202E, available from Mitsui Chemicals, Inc., melting point of 100° C., weight average molecular weight of 2600

[0175] 2,3-dihydroxypropyl octadecanoate; EXCEL T-95, available from Kao Corporation, melting point of 65° C., molecular weight of 350

[0176] dipentaerythritol fatty acid ester: Rikester SL-02, available from Riken Vitamin Co., Ltd., melting point of 63° C., molecular weight of 1853

[0177] They were uniformly mixed with a super mixer. Thus, a chlorinated polyvinyl chloride resin composition was obtained.

[0178] The structural unit contents of the obtained chlorinated polyvinyl chloride resin (A) were determined by FT-NMR using JEOLJNM-AL-300. The NMR analysis can be performed by the method specified in R. A. Komoroski, R. G. Parker, J. P. Shocker, Macromolecules, 1985, 18, 1257-1265. Table 1 shows the results.

[0179] The specific gravity of the MBS resin particles was measured using a dry automatic pycnometer (Accupyc 111340, available from Shimadzu Corporation).

(Production of Joint)

[0180] The obtained chlorinated polyvinyl chloride resin composition was supplied to a conical counter-rotating twin screw extruder (OSC-30, available from Osada Seisakusho) with a diameter of 30 mm, and pellets were produced at a resin temperature of 190° C.

[0181] The obtained pellets were supplied to an injection molding machine (J350ADS, available from JSW), and a socket-type pipe joint having an external diameter of 34.7 mm and an internal diameter of 26.9 mm was produced at a resin temperature when purged from the nozzle of 220° C.

Examples 2 to 18, Comparative Examples 1 to 14

[0182] Chlorinated polyvinyl chloride resin compositions and socket-type pipe joints were produced as in Example 1, except that the types and amounts of the chlorinated polyvinyl chloride resin, polyvinyl chloride, thermal stabilizer, diene rubber particles, and lubricant were changed as shown in Tables 2 and 3.

[0183] The structural unit contents, amount of added chlorine, and degree of polymerization of the chlorinated polyvinyl chloride resin used are shown in Table 1.

<Evaluation>

[0184] The following evaluations were performed on the chlorinated polyvinyl chloride resins and chlorinated polyvinyl chloride resin compositions obtained in the examples and comparative examples. Tables 2 and 3 show the results.

[Evaluation of Chlorinated Polyvinyl Chloride Resin and Chlorinated Polyvinyl Chloride Resin Composition]

<Mechanical Properties (Izod Impact Strength, Tensile Strength, Tensile Modulus of Elasticity, Heat Distortion Temperature)>

[0185] Each of the obtained chlorinated polyvinyl chloride resin compositions was supplied to two 8-inch rolls to be kneaded at 205° C. for three minutes, and formed into 1.0-mm-thick sheets. The obtained sheets were laminated on each other and preheated by pressing at 205° C. for three minutes, and then pressurized for four minutes. Thus, a 3-mm-thick pressed plate was obtained. The obtained pressed plate was machined to provide a specimen. Using the specimen, the Izod impact strength in conformity with ASTM D256 and tensile strength and tensile modulus of elasticity in conformity with ASTM D638 were measured. The heat distortion temperature was also measured at an applied load of 186 N/cm.sup.2 in conformity with ASTM D648. The measurement of the heat distortion temperature was performed after annealing of the obtained pressed plate for 24 hours in a gear oven at 90° C.

<Vicat Softening Temperature>

[0186] The Vicat softening temperature was measured in conformity with JIS K 7206:2016 (Plastics—Thermoplastic materials—Determination of Vicat softening temperature, B50 method).

<Glass Transition Temperature [Tg]>

[0187] The temperature of each of the obtained chlorinated polyvinyl chloride resins was raised from 40° C. to 200° C. at a rate of temperature rise of 5° C./min and then cooled from 200° C. to 40° C. at a rate of temperature drop of 5° C./min using a differential scanning calorimeter (DSC) (DSC Q20, available from TA Instruments Waters). The same operation was repeated, and the glass transition temperature was determined based on the DSC curve obtained from the second temperature rise. The glass transition temperature was determined from the intersection of the extrapolated straight line from the low temperature side before the inflection point and the tangent line at the inflection point. The glass transition temperature of the polyvinyl chloride was determined by the same method.

<Measurement of Haze and Total Light Transmittance>

[0188] Each of the obtained chlorinated polyvinyl chloride resin compositions was supplied to two 8-inch rolls to be kneaded at 185° C. for three minutes, and formed into 0.5-mm-thick sheets. The obtained sheets were laminated on each other and preheated by pressing at 180° C. for one minute, and then pressurized for one minute, followed by cooling for two minutes. Thus, a 3-mm-thick pressed plate was obtained. The haze and total light transmittance of the obtained pressed plate were measured using a haze meter (NDH2000, available from Nippon Denshoku Industries Co., Ltd.).

[0189] The haze is preferably 80% or lower. The haze is more preferably 75% or lower.

[0190] The lower limit is not limited. Yet, the lower limit of the haze is preferably 1%. When the haze is higher than 80%, a resulting molded article has lower transparency. In the case of a joint, for example, when a pipe is inserted into the joint, the state of insertion cannot be checked.

<Determination of Weight Change Rate>

[0191] The weight change rate of each of the obtained chlorinated polyvinyl chloride resin compositions when the temperature of the composition is raised from 30° C. to 250° C. at a rate of temperature rise of 10° C./min in nitrogen atmosphere was determined by TG/DTA (AST-2+TG/DTA6200, available from Hitachi High-Tech Science Corporation). The weight change rate (% by mass) was obtained by substituting the values obtained in the measurement into the following equation.

Weight change rate=((Mass at 30° C.−Mass at 250° C.)/(Mass at 30° C.))×100

[0192] The weight change rate is preferably 5% by mass or less. The weight change rate is more preferably 4% by mass or less. The lower limit is not limited. Yet, the lower limit of the weight change rate is preferably 0.1% by mass.

[0193] The weight change rate of not more than 5% by mass can prevent defects such as entrainment of bubbles inside the molded article or formation of a streak-like pattern at around the surface which adversely affects the transparency.

[Evaluation on Socket-Type Pipe Joint (Molded Article)]

<Visual Evaluation on Joining>

[0194] A colored adhesive (Eslon Adhesive, No. 83S White) was applied to an inner surface of the obtained joint. Similarly, the colored adhesive was applied to an outer surface of a chamfered pipe 20A. The pipe was inserted into the joint and the adhesive was dried for a day. Thus, a joining sample was provided.

[0195] The acceptability was determined based on the following criteria: the case where the adhesive in the joining portion of the joining sample was visually confirmable properly was rated as “o (Good)”; and the case where defects of the adhesive (e.g., unevenness, defective adhesion, poor visibility due to a flash in the product) was observed was rated as “x (Poor)”.

<Evaluation on Kneading Property>

[0196] The pellet obtained in (Production of joint) was supplied to an injection molding machine (J350ADS, available from JSW), and the resin temperature when purged from the nozzle was adjusted to 220° C. Then, the injection unit was placed in contact with the mold, and the rotational torque of the screw was determined in the measurement in which the rotation rate of the screw was 25 rpm and the back pressure was 10 MPa. The acceptability was determined based on the following criteria: the case where the rotational torque was 90% or lower of the rated value was rated as “o (Good)”; and the case where the rotational torque was higher than 90% of the rated value was rated as “x (Poor)”. For stable production, the rotational torque is preferably 90% or lower of the rated value.

<Evaluation on Heat Distortion Resistance>

[0197] The obtained joint was placed in an oven at 150° C. and allowed to stand still for one hour. The joint was taken out from the oven and visually checked whether or not foaming was observed and whether or not cracks were formed along the weld line. The acceptability was determined based on the following criteria: the case where no foaming or no cracks along the weld line was/were observed was rated as “o (Good)”; and the case where foaming and/or cracks along the weld line was/were observed was rated as “x (Poor)”.

TABLE-US-00001 TABLE 1 Amount of structural unit [mol %] Amount Structural Structural Structural of added unit unit unit chlorine Degree of (c) − Tg (a) (b) (c) [mass %} polymerization (b) (b)/(c) (° C.) Chlorinated polyvinyl chloride resin (A) 35.9 22.4 41.7 10.5 800 19.3 0.54 123.87 Chlorinated polyvinyl chloride resin (B) 35.9 32.4 31.7 10.5 800 −0.7 1.02 123.87 Chlorinated polyvinyl chloride resin (C) 35.9 27.4 36.7 10.5 800 9.3 0.75 123.87 Chlorinated polyvinyl chloride resin (D) 35.9 57.4 6.7 10.5 800 −50.7 8.57 123.87 Chlorinated polyvinyl chloride resin (E) 35.9 3.4 60.7 10.5 800 57.3 0.06 123.87 Chlorinated polyvinyl chloride resin (F) 10.0 40.0 50.0 14.8 800 10.0 0.80 141.47 Chlorinated polyvinyl chloride resin (G) 60.0 17.0 23.0 6.6 800 6.0 0.74 107.89 Chlorinated polyvinyl chloride resin (H) 10.0 20.0 70.0 14.8 800 50.0 0.29 141.47 Chlorinated polyvinyl chloride resin (I) 95.0 1.0 4.0 0.8 800 3.0 0.25 84.15 Chlorinated polyvinyl chloride resin (J) 5.0 40.0 55.0 15.6 800 15.0 0.73 144.75 Chlorinated polyvinyl chloride resin (K) 85.0 10.0 5.0 2.5 800 −5.0 2.00 91.11 Chlorinated polyvinyl chloride resin (L) 4.0 42.0 54.0 15.7 800 12.0 0.78 145.16 Chlorinated polyvinyl chloride resin (M) 37.0 8.0 55.0 10.3 800 47.0 0.15 123.05 Chlorinated polyvinyl chloride resin (N) 35.0 42.0 23.0 10.7 800 −19.0 1.83 124.69 Chlorinated polyvinyl chloride resin (O) 54.0 38.0 8.0 7.5 800 −30.0 4.75 111.58 Chlorinated polyvinyl chloride resin (P) 75.0 4.0 21.0 4.1 800 17.0 0.19 97.66 Chlorinated polyvinyl chloride resin (Q) 85.0 11.0 4.0 2.5 800 −7.0 2.75 91.11

TABLE-US-00002 TABLE 2 Example 1 2 3 4 5 6 Compo- Chlorinated polyvinyl 100 — — 100 100 — sition chloride resin (A) (Parts by Chlorinated polyvinyl — 100 — — — — mass) chloride resin (B) Chlorinated polyvinyl — — 100 — — — chloride resin (C) Chlorinated polyvinyl — — — — — — chloride resin (D) Chlorinated polyvinyl — — — — — — chloride resin (E) Chlorinated polyvinyl — — — — — 100 chloride resin (F) Chlorinated polyvinyl — — — — — — chloride resin (G) Chlorinated polyvinyl — — — — — — chloride resin (H) Chlorinated polyvinyl — — — — — — chloride resin (I) Chlorinated polyvinyl — — — — — — chloride resin (J) Chlorinated polyvinyl — — — — — — chloride resin (K) Chlorinated polyvinyl — — — — — — chloride resin (L) Chlorinated polyvinyl — — — — — — chloride resin (M) Chlorinated polyvinyl — — — — — — chloride resin (N) Chlorinated polyvinyl — — — — — — chloride resin (O) Chlorinated polyvinyl — — — — — — chloride resin (P) Chlorinated polyvinyl — — — — — — chloride resin (Q) Thermal Butyltin mercaptan 3.0 3.0 3.0 3.0 3.0 3.0 stabilizer compound Diene MBS (average 10.0 10.0 10.0 7.3 22.0 10.0 rubber particle size: particles 0.105 μm) Polyvinyl chloride 8.5 8.5 8.5 8.5 8.5 8.5 Polyethylene oxide wax 0.5 0.5 0.5 0.5 0.5 0.5 2,3-Dihydroxypropyl 1.5 1.5 1.5 1.5 1.5 1.5 octadecanoate Dipentaerythrtol fatty acid ester 1.0 1.0 1.0 1.0 1.0 1.0 Total 124.5 124.5 124.5 121.8 136.5 124.5 Amount of vinyl chloride unit in the entire 35.7 35.7 35.7 36.5 32.5 14.9 composition (mass %) Amount of vinyl chloride unit/(Chlorinated 40.9 40.9 40.9 40.9 40.9 17.1 polyvinyl chloride resin + polyvinyl chloride) (mass %) Ratio Mass ratio (diene rubber 3.3 3.3 3.3 2.4 7.3 3.3 particles/thermal stabilizer) Rubber Specific gravity 1.00 1.00 1.00 1.00 1.00 1.00 particles (g/cm.sup.3) Acrylic component/ 2.0 2.0 2.0 2.0 2.0 2.0 diene component Refractive index of rubber particles/amount 0.148 0.148 0.148 0.148 0.148 0.105 of added chlorine of Chlorinated polyvinyl chloride resin Evaluation Mechanical Izod impact 71 69 70 43 480 67 (Chlori property strength (J/m) nated- Tensile strength 49 50 50 53 43 55 polyvinyl (MPa) chloride Tensile modulus of 2,510 2,500 2,530 2,650 2,110 2,620 resin elasticity (MPa) compo- Heat distortion 109.3 109.1 109.0 109.6 105.3 123.6 sition) temperature (° C.) Vicat softening 108.2 107.8 107.6 108.3 102.9 121.4 temperature (° C.) Weight change rate 2.3 3.3 2.8 2.4 2.4 2.4 (mass %) Evaluation Optical Haze (%) 52 63 58 53 65 67 (Molded per- Total light 71 68 70 69 52 58 article) formance transmittance (%) Practical Visual evaluation ◯ ◯ ◯ ◯ ◯ ◯ evaluation on joining Kneading Rotational torque 75/◯ 78/◯ 80/◯ 78/◯ 78/◯ 88/◯ property (%)/evaluation (◯/X) Evaluation Heat distortion ◯ ◯ ◯ ◯ ◯ ◯ on heat resistance distortion (150° C./hr) resistance Example 7 8 9 10 11 12 Compo- Chlorinated polyvinyl — 100 100 100 100 — sition chloride resin (A) (Parts by Chlorinated polyvinyl — — — — — — mass) chloride resin (B) Chlorinated polyvinyl — — — — — — chloride resin (C) Chlorinated polyvinyl — — — — — — chloride resin (D) Chlorinated polyvinyl — — — — — — chloride resin (E) Chlorinated polyvinyl — — — — — — chloride resin (F) Chlorinated polyvinyl 100 — — — — — chloride resin (G) Chlorinated polyvinyl — — — — — — chloride resin (H) Chlorinated polyvinyl — — — — — — chloride resin (I) Chlorinated polyvinyl — — — — — — chloride resin (J) Chlorinated polyvinyl — — — — — 100 chloride resin (K) Chlorinated polyvinyl — — — — — — chloride resin (L) Chlorinated polyvinyl — — — — — — chloride resin (M) Chlorinated polyvinyl — — — — — — chloride resin (N) Chlorinated polyvinyl — — — — — — chloride resin (O) Chlorinated polyvinyl — — — — — — chloride resin (P) Chlorinated polyvinyl — — — — — — chloride resin (Q) Thermal Butyltin mercaptan 3.0 1.0 3.0 3.0 3.0 3.0 stabilizer compound Diene MBS (average 10.0 10.0 10.0 10.0 10.0 10.0 rubber particle size: particles 0.105 μm) Polyvinyl chloride 8.5 8.5 2.0 15.0 28.0 8.5 Polyethylene oxide wax 0.5 0.5 0.5 0.5 0.5 0.5 2,3-Dihydroxypropyl 1.5 1.5 1.5 1.5 1.5 1.5 octadecanoate Dipentaerythrtol fatty acid ester 1.0 1.0 1.0 1.0 1.0 1.0 Total 124.5 122.5 118.0 131.0 144.0 124.5 Amount of vinyl chloride unit in the entire 55.0 36.2 32.1 38.9 44.4 75.1 composition (mass %) Amount of vinyl chloride unit/(Chlorinated 63.1 40.9 37.2 44.3 49.9 86.2 polyvinyl chloride resin + polyvinyl chloride) (mass %) Ratio Mass ratio (diene rubber 3.3 10.0 3.3 3.3 3.3 3.3 particles/thermal stabilizer) Rubber Specific gravity 1.00 1.00 1.00 1.00 1.00 1.00 particles (g/cm.sup.3) Acrylic component/ 2.0 2.0 2.0 2.0 2.0 2.0 diene component Refractive index of rubber particles/ 0.235 0.148 0.148 0.148 0.148 0.620 amount of added chlorine of Chlorinated polyvinyl chloride resin Evaluation Mechanical Izod impact 73 72 71 80 85 35 (Chlori property strength (J/m) nated- Tensile strength 48 50 51 49 48 46 polyvinyl (MPa) chloride Tensile modulus of 2,410 2,530 2,540 2,480 2,460 2,310 resin elasticity (MPa) compo- Heat distortion 96.1 112.4 109.5 108.7 102.5 91.5 sition) temperature (° C.) Vicat softening 94.4 111.3 107.2 107.8 100.8 90.2 temperature (° C.) Weight change rate 3.8 2.2 2.3 2.3 2.5 2.4 (mass %) Evaluation Optical Haze (%) 66 51 50 65 67 70 (Molded per- Total light 60 73 70 60 64 61 article) formance transmittance (%) Practical Visual evaluation ◯ ◯ ◯ ◯ ◯ ◯ evaluation on joining Kneading Rotational torque 60/◯ 88/◯ 87/◯ 73/◯ 71/◯ 55/◯ property (%)/evaluation (◯/X) Evaluation Heat distortion ◯ ◯ ◯ ◯ ◯ ◯ on heat resistance distortion (150° C./hr) resistance Example 13 14 15 16 17 18 Compo- Chlorinated polyvinyl — — 100 100 100 — sition chloride resin (A) (Parts by Chlorinated polyvinyl — — — — — — mass) chloride resin (B) Chlorinated polyvinyl — — — — — — chloride resin (C) Chlorinated polyvinyl — — — — — — chloride resin (D) Chlorinated polyvinyl — — — — — — chloride resin (E) Chlorinated polyvinyl — — — — — — chloride resin (F) Chlorinated polyvinyl — — — — — — chloride resin (G) Chlorinated polyvinyl — — — — — — chloride resin (H) Chlorinated polyvinyl — — — — — — chloride resin (I) Chlorinated polyvinyl — — — — — 100 chloride resin (J) Chlorinated polyvinyl — — — — — — chloride resin (K) Chlorinated polyvinyl — — — — — — chloride resin (L) Chlorinated polyvinyl 100 — — — — — chloride resin (M) Chlorinated polyvinyl — — — — — — chloride resin (N) Chlorinated polyvinyl — 100 — — — — chloride resin (O) Chlorinated polyvinyl — — — — — — chloride resin (P) Chlorinated polyvinyl — — — — — — chloride resin (Q) Thermal Butyltin mercaptan 3.0 3.0 3.0 3.0 3.0 3.0 stabilizer compound Diene MBS (average 10.0 10.0 10.0 10.0 10.0 10.0 rubber particle size: particles 0.105 μm) Polyvinyl chloride 8.5 8.5 8.5 1.0 30.0 3.0 Polyethylene oxide wax 0.5 0.5 1.5 0.5 0.5 0.5 2,3-Dihydroxypropyl 1.5 1.5 2.5 1.5 1.5 1.5 octadecanoate Dipentaerythrtol fatty acid ester 1.0 1.0 2.0 1.0 1.0 1.0 Total 124.5 124.5 127.5 117.0 146.0 119.0 Amount of vinyl chloride unit in the entire 36.5 50.2 34.8 31.5 45.1 32.7 composition (mass %) Amount of vinyl chloride unit/(Chlorinated 41.9 57.6 40.9 36.5 50.7 37.8 polyvinyl chloride resin + polyvinyl chloride) (mass %) Ratio Mass ratio (diene rubber 3.3 3.3 3.3 3.3 3.3 3.3 particles/thermal stabilizer) Rubber Specific gravity 1.00 1.00 1.00 1.00 1.00 1.00 particles (g/cm.sup.3) Acrylic component/ 2.0 2.0 2.0 2.0 2.0 2.0 diene component Refractive index of rubber particles/ 0.150 0.207 0.148 0.148 0.148 0.099 amount of added chlorine of Chlorinated polyvinyl chloride resin Evaluation Mechanical Izod impact 73 45 70 70 74 65 (Chlori property strength (J/m) nated- Tensile strength 51 49 50 52 48 51 polyvinyl (MPa) chloride Tensile modulus of 2,510 2,460 2,520 2,540 2,470 2,600 resin elasticity (MPa) compo- Heat distortion 109.0 100.2 109.1 107.7 102.8 127.3 sition) temperature (° C.) Vicat softening 107.2 98.3 107.4 105.6 100.2 124.9 temperature (° C.) Weight change rate 2.4 2.3 2.2 2.2 2.4 2.3 (mass %) Evaluation Optical Haze (%) 64 68 58 48 62 57 (Molded per- Total light 61 52 68 71 55 65 article) formance transmittance (%) Practical Visual evaluation ◯ ◯ ◯ ◯ ◯ ◯ evaluation on joining Kneading Rotational torque 78/◯ 63/◯ 66/◯ 85/◯ 65/◯ 88/◯ property (%)/evaluation (◯/X) Evaluation Heat distortion ◯ ◯ ◯ ◯ ◯ ◯ on heat resistance distortion (150° C./hr) resistance

TABLE-US-00003 TABLE 3 Comparative Example 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Composition Chlorinated polyvinyl chloride resin (A) — — — — — — — — — — — — — — (Parts by mass) Chlorinated polyvinyl chloride resin (B) — — 100 100 — — — — — — — — — — Chlorinated polyvinyl chloride resin (C) — — — — — — — — — — — — — — Chlorinated polyvinyl chloride resin (D) 100 — — — — — — — 100 100 100 — — — Chlorinated polyvinyl chloride resin (E) — 100 — — — — — — — — — — — — Chlorinated polyvinyl chloride resin (F) — — — — — — — — — — — — — 100 Chlorinated polyvinyl chloride resin (G) — — — — — — — — — — — — — — Chlorinated polyvinyl chloride resin (H) — — — — 100 — — — — — — — — — Chlorinated polyvinyl chloride resin (I) — — — — — 100 — — — — — — — — Chlorinated polyvinyl chloride resin (J) — — — — — — — — — — — — — — Chlorinated polyvinyl chloride resin (K) — — — — — — — — — — — — — — Chlorinated polyvinyl chloride resin (L) — — — — — — 100 — — — — — — — Chlorinated polyvinyl chloride resin (M) — — — — — — — — — — — — — — Chlorinated polyvinyl chloride resin (N) — — — — — — — 100 — — — — — — Chlorinated polyvinyl chloride resin (O) — — — — — — — — — — — — — — Chlorinated polyvinyl chloride resin (P) — — — — — — — — — — — 100 — — Chlorinated polyvinyl chloride resin (Q) — — — — — — — — — — — — 100 — Thermal stabilizer Butyltin mercaptan compound 3.0 3.0 3.0 3.0 3.0 3.0 3 3 3 20 7.5 3 3 3.0 Diene rubber particles MBS (average particle size: 0.105 μm) 10.0 10.0 10.0 10.0 10.0 10.0 10 10 10 10 18.75 10 10 10.0 Polyvinyl chloride 8.5 8.5 35.0 0.1 8.5 8.5 8.5 8.5 8.5 8.5 21.25 8.5 8.5 0.1 Polyethylene oxide wax 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.165 0.5 0.75 0.5 0.5 0.5 2,3-Dihydroxypropyl octadecanoate 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 0.495 1.5 2.25 1.5 1.5 1.5 Dipentaerythritol fatty acid ester 1.0 1.0 1.0 1.0 1.0 1.0 1 1 0.33 1 1.5 1 1 1.0 Total 124.5 124.5 151.0 116.1 124.5 124.5 124.5 124.5 122.49 141.5 152 124.5 124.5 116.1 Amount of vinyl chloride unit in the entire composition (mass %) 35.7 35.7 47.0 31.0 14.9 83.1 10.0 34.9 36.2 31.4 37.6 35.7 35.7 31.0 Amount of vinyl chloride unit/(Chlorinated polyvinyl 40.9 40.9 52.5 36.0 17.1 95.4 11.5 40.1 40.9 40.9 47.1 40.9 40.9 36.0 chloride resin + polyvinyl chloride) (mass %) Ratio Mass ratio (diene rubber particles/thermal stabilizer) 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 0.5 2.5 3.3 3.3 3.3 Rubber particles Specific gravity (g/cm.sup.3) 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 Acrylic component/diene component 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Refractive index of rubber particles/amount of added 0.148 0.148 0.148 0.148 0.05 1.938 0.099 0.145 0.148 0.148 0.148 0.378 0.620 0.105 chlorine of Chlorinated polyvinyl Evaluation Mechanical property Izod impact strength (J/m) 70 69 36 91 62 73 83 72 70 67 300 45 42 85 Chlorinated Tensile strength (MPa) 50 50 47 52 55 45 50 40 50 44 47 46 45 52 polyvinyl Tensile modulus of elasticity (MPa) 2,490 2,540 2,440 2,550 2,650 2,280 2,620 2,520 2,510 2,350 2,400 2,320 2,300 2,540 chloride resin Heat distortion temperature (° C.) 109.1 108.8 103.3 111.6 124.5 82.3 127.9 110.1 109.8 88.1 96.8 91.1 82.5 125.3 composition) Vicat softening temperature (° C.) 107.6 107.1 101.8 109.5 122 80.8 126.1 107.8 107.3 87.2 75.5 88.9 80.6 122.9 Weight change rate (mass %) 2.4 2.3 2.2 2.4 2.3 2.4 2.3 2.4 2.3 13.8 6.8 2.4 2.3 2.4 Evaluation Optical performance Haze (%) 87 81 85 48 60 55 53 84 52 58 84 76 82 53 (Molded article) Total light transmittance (%) 43 48 42 85 62 70 71 46 71 69 41 48 45 81 Practical evaluation Visual evaluation on joining X X X ◯ ◯ ◯ X X ◯ ◯ X ◯ X ◯ Kneading property Rotational torque (%)/evaluation (◯/X) 77/◯ 91/X 79/◯ 98/X 98/X 55/◯ 98/X 76/◯ 100/X 50/◯ 52/◯ 58/◯ 55/◯ 93/X Evaluation on Heat distortion resistance (150° C./hr) ◯ X ◯ X X X ◯ X X X X X X ◯ heat distortion

INDUSTRIAL APPLICABILITY

[0198] The present invention can provide a resin composition for molding capable of producing a molded article that has excellent heat distortion resistance, excellent mechanical properties, high impact resistance, and high transparency and has a smaller change in weight at high temperature. The present invention can also provide a molded article and a joint each produced from the resin composition for molding.