CPVC compounds and articles made therefrom for design stress rat

Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing

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428 369, B29D 2200

Patent

active

056039980

ABSTRACT:
CPVC compounds intended for low shear extrusion, for example of piping, and articles such as piping derived therefrom are disclosed. The compounds comprise CPVC having 69% to 74% by weight chlorine and preferably 65% to about 69% chlorine; an acrylic impact modifier and a first chlorinated polyethylene containing from about 32% to about 37% chlorine by weight and a Mooney viscosity from 25 to 45, and a second CPE containing from about 36 to about 42% chlorine and a Mooney viscosity of from 60 to about 95. Compression molded plaques derived from the powder composition exhibit a good balance of tensile strength, tensile modulus, izod impact strength, HDT and dynamic thermal stability specified herein. A pipe extruded directly from said composition in powder form under ASTM-D2846 exhibits a long term hydrostatic: design strength of at least 500 psi at 200.degree. F. The invention is useful, for example, for industrial use applications such as steam condensate lines.

REFERENCES:
patent: 3334156 (1967-08-01), Calentine et al.
patent: 4213891 (1980-07-01), Wear
patent: 4983687 (1991-01-01), Lawson et al.
patent: 5194471 (1993-03-01), Hartitz
ASTM Designation: D2444-93 "Standard Test Method for Determination of the Impact Resistance of Thermoplastic Pipe and Fittings by Means of a Tup (Falling Weight)", pp. 130-136.
ASTM Designation: D1598-86 (Reapproved 1991) "Standard Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure", pp. 29-31.
ASTM Designation: D1784-92 "Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds", pp. 46-49.
ASTM Designation: D256-93a "Standard Test Methods for Determining the Pendulum Impact Resistance of Notched Specimens of Plastics", pp. 1-18.
ASTM Designation: D638-91 "Standard Test Method for Tensile Properties of Plastics", pp. 52-64.
ASTM Designation: D648-82 (Reapproved 1988) "Standard Test Method for Deflection Temperature of Plastics Under Flexural Load", pp. 69-73.
ASTM Designation: D2846-93 "Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Hot-and Cold-Water Distribution Systems", pp. 312-322.
ASTM Designation: D2846-88 "Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Hot-and Cold-Water Distribution Systems", pp. 325-332.
ASTM Designation: F441-93 "Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Pipe, Schedules 40 and 80", pp. 762-767.
ASTM Designation: D1243-79 (Reapproved 1990) "Standard Test Method for Dilute Solution Viscosity of Vinyl Chloride Polymers", pp. 276-278.
ASTM Designation: D792-91 "Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement", pp. 174-177.

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