This disclosure pertains to novel polyvinyl chloride compositions containing polyvinyl chloride resins, polycarbonate resins and copolyester resins. More particularly, the present disclosure pertains to polyvinyl chloride compositions including admixtures of polycarbonates and high glass transition temperature (T.sub.g) copolyesters to increase the T.sub.g and the heat distortion temperature under load (HDTUL) of the polyvinyl chloride compositions.

Provided is a method for preparing a chlorinated polyvinyl chloride resin, and more particularly, a method for preparing a chlorinated polyvinyl chloride resin including a neutralization process for neutralizing to pH of 2 to 5 using metal hydroxide as a first neutralizing agent a), and completing neutralization using a carbonate-based compound as a second neutralizing agent b), wherein residual hydrochloric acid in pores of the chlorinated polyvinyl chloride resin obtained by chlorination of a polyvinyl chloride or a vinyl chloride-based copolymer may be efficiently removed, and thermal stability and extrusion appearance of processed articles may be improved.

Provided is a method for preparing a chlorinated polyvinyl chloride resin, and more particularly, a method for preparing a chlorinated polyvinyl chloride resin including a neutralization process for neutralizing to pH of 2 to 5 using metal hydroxide as a first neutralizing agent a), and completing neutralization using a carbonate-based compound as a second neutralizing agent b), wherein residual hydrochloric acid in pores of the chlorinated polyvinyl chloride resin obtained by chlorination of a polyvinyl chloride or a vinyl chloride-based copolymer may be efficiently removed, and thermal stability and extrusion appearance of processed articles may be improved.

The present invention provides a chlorinated vinyl chloride resin composition for a window frame having excellent properties including moldability, heat resistance, and impact resistance and capable of preventing or reducing deformation such as warpage or damage even after exposure to sunlight for a long time. Provided is a chlorinated vinyl chloride resin composition for a window frame, containing a chlorinated vinyl chloride resin and an infrared reflective pigment.

The present invention provides a chlorinated vinyl chloride resin composition for a window frame having excellent properties including moldability, heat resistance, and impact resistance and capable of preventing or reducing deformation such as warpage or damage even after exposure to sunlight for a long time. Provided is a chlorinated vinyl chloride resin composition for a window frame, containing a chlorinated vinyl chloride resin and an infrared reflective pigment.

The present invention provides a chlorinated vinyl chloride resin composition for a window frame having excellent properties including moldability, heat resistance, and impact resistance and capable of preventing or reducing deformation such as warpage or damage even after exposure to sunlight for a long time. Provided is a chlorinated vinyl chloride resin composition for a window frame, containing a chlorinated vinyl chloride resin and an infrared reflective pigment.

The present invention provides a chlorinated polyvinyl chloride that enables excellent continuous productivity in molding and that enables a molded article to have both processability and unevenness-preventing properties. Provided is a chlorinated polyvinyl chloride having an endothermic peak start temperature (L) and an endothermic peak end temperature (H) that satisfy the following expression (1) in endothermic peak measurement using a differential scanning calorimeter (DSC): 41° C.≤H−L≤98° C. (1).

The present invention provides a chlorinated polyvinyl chloride that enables excellent continuous productivity in molding and that enables a molded article to have both processability and unevenness-preventing properties. Provided is a chlorinated polyvinyl chloride having an endothermic peak start temperature (L) and an endothermic peak end temperature (H) that satisfy the following expression (1) in endothermic peak measurement using a differential scanning calorimeter (DSC): 41° C.≤H−L≤98° C. (1).

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).

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).