Provided is a dispersion assistant useful for suspension polymerization of vinyl-based compounds. The dispersion assistant comprises a polyvinyl alcohol-based polymer (A) comprising a constituent unit represented by the general formula (1) shown below at 0.1 to 10 mol % per polyvinyl alcohol monomer unit and having a saponification degree of 15 to 70 mol %. ##STR00001##
(In the formula, R denotes an alkyl group.)

Disclosed herein are plasticized poly(vinyl chloride) compounds. One aspect relates to a flame retardant poly(vinyl chloride) compound, comprising a mixture of poly(vinyl chloride); and a plasticizer comprising polymeric plasticizer, and/or alkyl aryl fire retardant plasticizer, wherein the mixture has a Limiting Oxygen Index of greater than 50% according to ASTM D2863; an Elongation at Break of at least 10% according to ASTM D638 (Type IV); and a Modulus of Elasticity of less than about 15,000 psi according to ASTM 638 (Type IV).

Disclosed herein are plasticized poly(vinyl chloride) compounds. One aspect relates to a flame retardant poly(vinyl chloride) compound, comprising a mixture of poly(vinyl chloride); and a plasticizer comprising polymeric plasticizer, and/or alkyl aryl fire retardant plasticizer, wherein the mixture has a Limiting Oxygen Index of greater than 50% according to ASTM D2863; an Elongation at Break of at least 10% according to ASTM D638 (Type IV); and a Modulus of Elasticity of less than about 15,000 psi according to ASTM 638 (Type IV).

The present invention provides a chlorinated polyvinyl chloride resin that has resistance to thermal decomposition, provides excellent continuous productivity in molding, and imparts both processability and unevenness-preventing properties to a molded article. The present invention relates to a chlorinated polyvinyl chloride resin, containing three components including a A.sub.150 component, a B.sub.150 component, and a C.sub.150 component, and having a percentage of the C.sub.150 component (C.sub.150 component/(A.sub.150 component+B.sub.150 component+C.sub.150 component)) of less than 8.0%, the three components being identified by measuring the chlorinated polyvinyl chloride resin by a solid echo method using pulse NMR at 150° C. to give a free induction decay curve of .sup.1H spin-spin relaxation, and subjecting the free induction decay curve to waveform separation into three curves derived from the A.sub.150 component, the B.sub.150 component, and the C.sub.150 component in order of shorter relaxation time using the least square method.

The present invention provides a chlorinated polyvinyl chloride resin that has resistance to thermal decomposition, provides excellent continuous productivity in molding, and imparts both processability and unevenness-preventing properties to a molded article. The present invention relates to a chlorinated polyvinyl chloride resin, containing three components including a A.sub.150 component, a B.sub.150 component, and a C.sub.150 component, and having a percentage of the C.sub.150 component (C.sub.150 component/(A.sub.150 component+B.sub.150 component+C.sub.150 component)) of less than 8.0%, the three components being identified by measuring the chlorinated polyvinyl chloride resin by a solid echo method using pulse NMR at 150° C. to give a free induction decay curve of .sup.1H spin-spin relaxation, and subjecting the free induction decay curve to waveform separation into three curves derived from the A.sub.150 component, the B.sub.150 component, and the C.sub.150 component in order of shorter relaxation time using the least square method.

The present invention provides a chlorinated polyvinyl chloride resin 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 resin having, in Raman measurement by Raman spectroscopy, an average of a ratio (A/B) of a peak intensity A observed in a range of 660 to 700 cm.sup.−1 to a peak intensity B observed in a range of 600 to 650 cm.sup.−1 of 0.50 to 2.00, and a standard deviation of the A/B of 0.090 or less.

The present invention provides a chlorinated polyvinyl chloride resin 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 resin having, in Raman measurement by Raman spectroscopy, an average of a ratio (A/B) of a peak intensity A observed in a range of 660 to 700 cm.sup.−1 to a peak intensity B observed in a range of 600 to 650 cm.sup.−1 of 0.50 to 2.00, and a standard deviation of the A/B of 0.090 or less.

The present invention provides a chlorinated polyvinyl chloride resin that not only has high heat resistance and high mechanical strength but also is excellent in molding processability and is very easy to soften and additionally enables production of a molded article with high gloss. The present invention relates to a chlorinated polyvinyl chloride resin, containing three components including a A.sub.150 component, a B.sub.150 component, and a C.sub.150 component, and having a percentage of the C.sub.150 component (C.sub.150 component/(A.sub.150 component+B.sub.150 component+C.sub.150 component)) of 8.0% or more and 30.0% or less, the three components being identified by measuring the chlorinated polyvinyl chloride resin by a solid echo method using pulse NMR at 150° C. to give a free induction decay curve of .sup.1H spin-spin relaxation, and subjecting the free induction decay curve to waveform separation into three curves derived from the A.sub.150 component, the B.sub.150 component, and the C.sub.150 component in order of shorter relaxation time using the least square method.

The present invention provides a chlorinated polyvinyl chloride resin that not only has high heat resistance and high mechanical strength but also is excellent in molding processability and is very easy to soften and additionally enables production of a molded article with high gloss. The present invention relates to a chlorinated polyvinyl chloride resin, containing three components including a A.sub.150 component, a B.sub.150 component, and a C.sub.150 component, and having a percentage of the C.sub.150 component (C.sub.150 component/(A.sub.150 component+B.sub.150 component+C.sub.150 component)) of 8.0% or more and 30.0% or less, the three components being identified by measuring the chlorinated polyvinyl chloride resin by a solid echo method using pulse NMR at 150° C. to give a free induction decay curve of .sup.1H spin-spin relaxation, and subjecting the free induction decay curve to waveform separation into three curves derived from the A.sub.150 component, the B.sub.150 component, and the C.sub.150 component in order of shorter relaxation time using the least square method.

The present invention provides a chlorinated polyvinyl chloride resin that enables the production of a molded article that maintains high adhesion strength even when used in a form subjected to high pressure and is less susceptible to defects such as cracks due to insufficient strength, as well as a resin composition for molding and a molded article each including the chlorinated polyvinyl chloride resin. Provided is a chlorinated polyvinyl chloride resin having an average of a ratio (A/B) of a peak intensity A observed in a range of 300 to 340 cm.sup.-1 to a peak intensity B observed in a range of 1,450 to 1,550 cm.sup.-1 of 0.1 or more and 3.5 or less in Raman imaging measurement by Raman spectroscopy.