Rigid chlorinated polyvinyl chloride compound and articles deriv

Details Rigid chlorinated polyvinyl chloride compound and articles deriv Rigid chlorinated polyvinyl chloride compound and articles deriv

1991-02-15

1993-03-16

Thibodeau, Paul J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

525 84, 525 86, C08K 558

Patent

active

051944715

ABSTRACT:
CPVC compositions, pipe, and a method of preparing a pipe are disclosed and comprise CPVC having 63% to 70% by weight chlorine and preferably 65% to about 69% chlorine; a high rubber impact modifier comprising a graft copolymer of a rubbery polydiene and one or preferably more than one hardening monomer selected from a group consisting of a vinyl aromatic monomer, a (meth)acrylate, and a (meth)acrylonitrile monomer including mixtures. Said graft copolymer exhibits a Shore D hardness of less than about 64, and preferably between about 35 and 45; and a chlorinated polyethylene containing between 30% and 40% chlorine by weight, compression molded placques derived from the powder composition exhibit a minimum tensile strength, modulus, izod impact strength, Tg and dynamic thermal stability specified herein. A pipe extruded directly from said composition meets ASTM-D2846 and exhibits unexpected ductility down to 20.degree. F. (-6.6.degree. C.) under fixed drop dart impact testing. The invention is useful for example in articles such as hot and cold water distribution system components installed in seasonal environments.

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patent: 3642948 (1972-02-01), Bauer et al.
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patent: 4584349 (1986-04-01), Lehr
patent: 4647646 (1987-03-01), Hardy et al.
patent: 4710533 (1986-12-01), Neuman
patent: 4983687 (1991-04-01), Lawson

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