CPVC pipe fitting having improved resistance to environmental stress cracking
AssigneeLubrizol Advanced Materials, Inc.
InventorsChristopher D. Zook, Mark D. Julius
Life of this patent
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Abstract
The disclosed technology relates to a plastic compound suitable for preparing articles, such as pipe fittings and valves, with good physical properties, such as impact strength, and resistance to environmental stress cracking (ESC). In particular, the technology relates to a vinyl chloride resin, which includes chlorinated polyvinyl chloride (“CPVC”) homopolymer. Furthermore, the invention relates to vinyl chloride homopolymer compounds containing the vinyl chloride homopolymer resin, and articles made from such compounds, which compounds meet 23447 cell classifications under ASTM D1784.
Claims11
A fitting for joining pipe sections prepared from a chlorinated vinyl chloride (CPVC) compound, wherein the CPVC compound comprises (A) at least one chlorinated vinyl chloride homopolymer resin (CPVC resin) prepared by chlorinating a vinyl chloride resin having an inherent viscosity of about 0.79 to about 1.02 and a chlorine content of about 63 wt. % to about 66.75 wt. %.
A method of providing an improved fitting for joining pipe having improved resistance to environmental stress cracking compared to fittings for joining pipe prepared from a CPVC compound having chlorinated vinyl chloride homopolymer resin (“CPVC resin”) prepared by chlorinating a vinyl chloride resin having an inherent viscosity of less than 0.68, comprising molding the improved fitting from a CPVC compound comprising CPVC resin prepared by chlorinating a vinyl chloride resin having an inherent viscosity of about 0.79 to about 1.02 and having a chlorine content of about 63 wt. % to about 66.75 wt. %.
Dependencies are inferred from the claim text.