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AssigneeLubrizol Advanced Materials, Inc.
InventorsArthur L. Backman, Rocco A. Mango, Robert S. Newby, Andrew M. Olah
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CPVC pipe in diameters in the range from 15 mm (0.5 inch) to 15.24 cm (6 ins), to carry hot and cold aqueous streams under 690 KPa (100 psi) pressure and 82.2° C. (180° F.) in continuous service, is extruded from a compound in which the CPVC has a high Cl content in the range from 66.5%-70%, when modified with either of two specific impact high rubber modifiers in an amount greater than 5 parts but no more than 6 parts per 100 parts of CPVC. Extruded CPVC pipe provides a HDB measured according to ASTM D2837-01 which is 25% or more greater than that required for commercial pipe as specified in ASTM D2846. As a result, both SDR-11 and SDR-13.5 pipe are produced which provide a HDB of at least 1250 psi (8.62 MPa) at the 100,000 hr intercept.
A CPVC pipe having a standard dimension ratio of 13.5 which is made with a CPVC composition meeting a hydrostatic design basis (HDB) of at least 1250 psi at the 100,000 hr intercept, as measured according to ASTM-D2837-01 at 180° F., wherein the pipe is of a cell class of at least 2-4-4-4-7 and has a pressure rating of at least 100 psig as calculated using a safety factor of 0.5 and wherein the CPVC composition is comprised of (a) 100 parts by weight of a CPVC resin, wherein the CPVC resin has a chlorine content which is within the range of 66.5 percent to 70 percent by weight and made from PVC having an inherent viscosity of at least 0.88;
Dependencies are inferred from the claim text.