Plastic pipes and fittings for home and industrial use

Abstract

Plastic pipes, fittings and other piping appurtenances prepared from CPVC formulations meeting requirements of ASTM-D 1784, cell class 23448-B, yet exhibiting suitable processability.

What is claimed is:  
     
         1 . An extruded pipe, or a molded or extruded fitting or other piping appurtenance prepared from a CPVC formulation exhibiting suitable processability and meeting the base resin, impact strength, heat deflection temperature, tensile strength, and tensile modulus requirements of ASTM-D 1784, cell class 23448-B, with the proviso that said CPVC formulation is substantially free of chlorinated polyethylene.  
     
     
         2 . A pipe, fitting or other piping appurtenance according to  claim 1 , prepared from a CPVC formulation comprising a CPVC resin having a chlorine content of at least 70% by weight and an inherent viscosity of about 0.65 to about 0.72, and a high rubber content and high efficiency MBS impact modifier, said CPVC formulation having a melt flow index of about 1 to about 20g/10 minutes and a DTS time of at least 3 minutes at 235° C./35 r/m.  
     
     
         3 . A pipe, fitting or other piping appurtenance according to  claim 2 , prepared from a CPVC formulation having a melt flow index of about 5 to about 20 g/10 minutes, and a DTS time of at least 5 minutes.  
     
     
         4 . A pipe, fitting or other piping appurtenance according to  claim 1 , meeting the acid weight gain requirements of ASTM-D 1784, cell class 23448-B.  
     
     
         5 . A pipe, fitting or other piping appurtenance according to  claim 3 , wherein said formulation further comprises a lower molecular weight CPVC resin having an inherent viscosity of about 0.45 to about 0.60, in an amount of about 10 to about 20 weight %.  
     
     
         6 . A pipe, fitting or other piping appurtenance according to  claim 2 , wherein said formulation comprises a CPVC resin with a chlorine content of about 70 to about 73% by weight and an inherent viscosity of about 0.65 to about 0.72, about 2 to about 4 phr of tin stabilizer(s), about 5 to about 10 phr of MBS impact modifier(s), up to about 3 phr of acrylic process aid(s), about 0.4 to about 5 phr lubricant(s), and about 0.25 to about 1.0 phr antioxidant(s).  
     
     
         7 . A CPVC formulation comprising: a CPVC resin having a chlorine content of at least 70% by weight and characterized by an inherent viscosity of about 0.60 to about 1.0, from about 3 to about 15 phr of a high rubber content MBS and/or ABS impact modifier, said formulation meeting the base resin, impact strength, heat deflection temperature, tensile strength, and tensile modulus requirements of ASTM-D 1784, cell class 23448-B, with the proviso that said CPVC formulation is substantially free of chlorinated polyethylene.  
     
     
         8 . A CPVC formulation according to  claim 7 , meeting the acid weight gain requirements of ASTM-D 1784, cell class 23448-B.  
     
     
         9 . A CPVC formulation according to  claim 7 , comprising a CPVC resin having a chlorine content of at least 70% by weight and an inherent viscosity of about 0.65 to about 0.72, and a high rubber content and high efficiency MBS impact modifier, said CPVC formulation having a melt flow index of about 1 to about 25g/10 minutes and a DTS time of at least about 3 minutes at 235° C./35 r/m.  
     
     
         10 . A CPVC formulation according to  claim 7 , comprising a CPVC resin having a chlorine content of at least 70% by weight and an inherent viscosity of about 0.65 to about 0.72, and a high rubber content and high efficiency MBS impact modifier, said CPVC formulation having a melt flow index of about 5 to about 20 g/10 minutes and a DTS time of at least about 5 minutes.  
     
     
         11 . A CPVC formulation according to  claim 9 , further comprising a lower molecular weight CPVC resin having an inherent viscosity of about 0.45 to about 0.60, in an amount of about 10 to about 20 weight % of total CPVC resin.  
     
     
         12 . A CPVC formulation according to  claim 9 , comprising a CPVC resin with a chlorine content of about 70 to 73% by weight, about 2 to about 4 phr of a tin stabilizer(s), about 5 to about 10 phr of MBS impact modifier(s), up to about 3 phr of acrylic process aid(s), about 0.4 to about 5 phr lubricant(s), and about 0.25 to about 1.0 phr antioxidant(s), and containing no polyorganosiloxane-containing impact modifier.  
     
     
         13 . A CPVC formulation according to  claim 7 , further comprising a lower molecular weight CPVC resin having an inherent viscosity of about 0.45 to about 0.60, in an amount of about 10 to about 20 weight % of the total CPVC resin.  
     
     
         14 . A CPVC formulation according to  claim 9 , in the form of a fitting or piping appurtenance.