Chlorinated vinyl chloride resin composition

Abstract

A chlorinated vinyl chloride resin composition comprising 100 parts by weight of chlorinated vinyl chloride resin and a hydroxypolycarboxylic acid salt, e.g., sodium tartrate, and/or 0.2 to 1.5 parts by weight of zeolite. The composition exhibits improved thermal stability and is particularly suited to pipe extrusion.

What is claimed is:  
     
         1 . A chlorinated vinyl chloride resin composition comprising 100 parts by weight of a chlorinated vinyl chloride resin and 0.2 to 1.5 parts by weight of zeolite.  
     
     
         2 . A chlorinated vinyl chloride resin composition comprising a chlorinated vinyl cloride resin containing a hydroxypolycarboxylic acid salt.  
     
     
         3 . A chlorinated vinyl chloride resin composition comprising 100 parts by weight of a chlorinated vinyl chloride resin containing a hydroxypolycarboxylic acid salt and 0.2 to 1.5 parts by weight of zeolite.  
     
     
         4 . A chlorinated vinyl chloride resin composition according to  claim 2 , wherein said hydroxypolycarboxylic acid salt is at least one of sodium tartrate, potassium tartrate, sodium malate, and potassium malate.  
     
     
         5 . A chlorinated vinyl chloride resin composition according to  claim 3 , wherein said hydroxypolycarboxylic acid salt is at least one of sodium tartrate, potassium tartrate, sodium malate, and potassium malate.  
     
     
         6 . A chlorinated vinyl chloride resin composition according to  claim 2 , wherein said hydroxypolycarboxylic acid salt is present in a concentration of 50 to 5000 ppm based on the chlorinated vinyl chloride resin.  
     
     
         7 . A chlorinated vinyl chloride resin composition according to  claim 3 , wherein said hydroxypolycarboxylic acid salt is present in a concentration of 50 to 5000 ppm based on the chlorinated vinyl chloride resin.  
     
     
         8 . A chlorinated vinyl chloride resin composition according to  claim 1 , wherein the vinyl chloride resin before being chlorinated has a degree of polymerization of 600 to 1500, said chlorinated vinyl chloride resin has a degree of chlorination of 62 to 70% by weight, and the composition further comprises an impact modifier, an organotin heat stabilizer, and a lubricant.  
     
     
         9 . A chlorinated vinyl chloride resin composition according to  claim 2 , wherein the vinyl chloride resin before being chlorinated has a degree of polymerization of 600 to 1500, said chlorinated vinyl chloride resin has a degree of chlorination of 62 to 70% by weight, and the composition further comprises an impact modifier, an organotin heat stabilizer, and a lubricant.  
     
     
         10 . A chlorinated vinyl chloride resin composition according to  claim 3 , wherein the vinyl chloride resin before being chlorinated has a degree of polymerization of 600 to 1500, said chlorinated vinyl chloride resin has a degree of chlorination of 62 to 70% by weight, and the composition further comprises an impact modifier, an organotin heat stabilizer, and a lubricant.  
     
     
         11 . A chlorinated vinyl chloride resin composition according to  claim 1 , wherein said zeolite is calcium-substituted A type zeolite having a residual sodium content of 10% by weight or less in terms of Na 2 O and a degree of calcium substitution of 42% or more.  
     
     
         12 . A chlorinated vinyl chloride resin composition according to  claim 3 , wherein said zeolite is calcium-substituted A type zeolite having a residual sodium content of 10% by weight or less in terms of Na 2 O and a degree of calcium substitution of 42% or more.  
     
     
         13 . A chlorinated vinyl chloride resin composition according to  claim 8 , wherein said impact modifier is a combination of 3 to 14 parts by weight of a methyl methacrylate-butadiene-styrene polymer and 1 to 5 parts by weight of chlorinated polyethylene having a chlorine content of 10 to 50% by weight, per 100 parts by weight of a chlorinated vinyl chloride resin.  
     
     
         14 . A chlorinated vinyl chloride resin composition according to  claim 9 , wherein said impact modifier is a combination of 3 to 14 parts by weight of a methyl methacrylate-butadiene-styrene polymer and 1 to 5 parts by weight of chlorinated polyethylene having a chlorine content of 10 to 50% by weight, per 100 parts by weight of a chlorinated vinyl chloride resin.  
     
     
         15 . A chlorinated vinyl chloride resin composition according to  claim 10 , wherein said impact modifier is a combination of 3 to 14 parts by weight of a methyl methacrylate-butadiene-styrene polymer and 1 to 5 parts by weight of chlorinated polyethylene having a chlorine content of 10 to 50% by weight, per 100 parts by weight of a chlorinated vinyl chloride resin.  
     
     
         16 . A chlorinated vinyl chloride resin composition according to  claim 13 , wherein said methyl methacrylate-butadiene-styrene polymer has a butadiene content of less than 60% by weight.  
     
     
         17 . A chlorinated vinyl chloride resin composition according to  claim 14 , wherein said methyl methacrylate-butadiene-styrene polymer has a butadiene content of less than 60% by weight.  
     
     
         18 . A chlorinated vinyl chloride resin composition according to  claim 15 , wherein said methyl methacrylate-butadiene-styrene polymer has a butadiene content of less than 60% by weight.  
     
     
         19 . A chlorinated vinyl chloride resin composition according to  claim 13 , wherein said chlorinated polyethylene has a chlorine content of 30 to 40% by weight.  
     
     
         20 . A chlorinated vinyl chloride resin composition according to  claim 14 , wherein said chlorinated polyethylene has a chlorine content of 30 to 40% by weight.  
     
     
         21 . A chlorinated vinyl chloride resin composition according to  claim 15 , wherein said chlorinated polyethylene has a chlorine content of 30 to 40% by weight.  
     
     
         22 . A chlorinated vinyl chloride resin composition according to  claim 13 , wherein said methyl methacrylate-butadiene-styrene polymer is present in an amount of 4 to 12 parts by weight.  
     
     
         23 . A chlorinated vinyl chloride resin composition according to  claim 14 , wherein said methyl methacrylate-butadiene-styrene polymer is present in an amount of 4 to 12 parts by weight per 100 parts by weight of the chlorinated vinyl chloride resin.  
     
     
         24 . A chlorinated vinyl chloride resin composition according to  claim 15 , wherein said methyl methacrylate-butadiene-styrene polymer is present in an amount of 4 to 12 parts by weight per 100 parts by weight of the chlorinated vinyl chloride resin.  
     
     
         26 . A chlorinated vinyl chloride resin composition according to  claim 8 , wherein said lubricant is polyethylene wax and/or polyethylene oxide wax.  
     
     
         27 . A chlorinated vinyl chloride resin composition according to  claim 9 , wherein said lubricant is polyethylene wax and/or polyethylene oxide wax.  
     
     
         28 . A chlorinated vinyl chloride resin composition according to  claim 10 , wherein said lubricant is polyethylene wax and/or polyethylene oxide wax.  
     
     
         29 . A chlorinated vinyl chloride resin composition according to  claim 1 , which is for pipe extrusion.  
     
     
         30 . A chlorinated vinyl chloride resin composition according to  claim 2 , which is for pipe extrusion.  
     
     
         31 . A chlorinated vinyl chloride resin composition according to  claim 3 , which is for pipe extrusion.  
     
     
         32 . A chlorinated vinyl chloride resin composition wherein extruded pipes suffer from no burn marks even after 3 hours' extrusion when a pipe extruder die has scratches in the inside thereof.  
     
     
         33 . A chlorinated vinyl chloride resin composition according to  claim 32 , wherein said chlorinated vinyl chloride resin composition is a composition as defined in  claim 1 .  
     
     
         34 . A chlorinated vinyl chloride resin composition according to  claim 32 , wherein said chlorinated vinyl chloride resin composition is a composition as defined in  claim 2 .  
     
     
         35 . A chlorinated vinyl chloride resin composition according to  claim 32 , wherein said chlorinated vinyl chloride resin composition is a composition as defined in  claim 3 .  
     
     
         36 . An extruded pipe prepared from a chlorinated vinyl chloride resin composition comprising 100 parts by weight of a chlorinated vinyl chloride resin and 0.2 to 1.5 parts by weight of zeolite.  
     
     
         37 . An extruded pipe prepared from a chlorinated vinyl chloride resin composition comprising a chlorinated vinyl chloride resin containing a hydroxypolycarboxylic acid salt.  
     
     
         38 . An extruded pipe prepared from a chlorinated vinyl chloride resin composition comprising 100 parts by weight of chlorinated vinyl chloride resin containing a hydroxypolycarboxylic acid salt and 0.2 to 1.5 parts by weight of zeolite.