CPVC PIPE FITTING THAT HAS IMPROVED RESISTANCE TO CRACKING DUE TO ENVIRONMENTAL STRESSES

MX435119BActive Publication Date: 2026-06-12LUBRIZOL ADVANCED MATERIALS INC
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Patent Information

Application Number
MX2022007473
Authority / Receiving Office
MX · MX
Patent Type
Patents
Current Assignee / Owner
Priority Date
2014-12-19
Filing Date
2017-06-16
Publication Date
2026-06-12
Estimated Expiration
2035-12-17

AI Technical Summary

Technical Problem

CPVC resins are prone to environmental stress cracking (ESC) and have low impact resistance, making them challenging to process and use in applications where they come into contact with liquids, despite their excellent thermal and chemical properties.

Method used

The use of high molecular weight CPVC resin, prepared by chlorinating vinyl chloride resin with an intrinsic viscosity of 0.79 or greater, combined with conventional molecular weight CPVC resin, and additional additives like stabilizers and impact modifiers, to create a CPVC compound that enhances ESC resistance and maintains or improves impact resistance.

Benefits of technology

The CPVC compound exhibits significantly improved resistance to environmental stress cracking and maintains or exceeds impact resistance, meeting ASTM D1784 Cellular Class 23447 requirements, ensuring longer durability and reliability in applications involving liquids.

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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 resistance and resistance to environmental stress cracking (ESC). In particular, the technology relates to a vinyl chloride resin, including poly(vinyl chloride) homopolymer (CPVC). Furthermore, the invention relates to vinyl chloride homopolymer compounds containing the vinyl chloride homopolymer resin, and to articles manufactured from such compounds, said compounds meeting cell classification 23447 according to ASTM D1784.
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