The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 1994
Filed:
Mar. 29, 1993
Arthur L Backman, Westlake, OH (US);
Bernard F Cinadr, Brecksville, OH (US);
The B.F. Goodrich Company, Akron, OH (US);
Abstract
A novel chlorinated poly(vinyl chloride) ('CPVC') resin is prepared by a two-step process which uses an organic peroxide catalyst rather than a source of actinic light. The novel two-step 'photoless' process yields a CPVC ('two-step CPVC') which, even at 72% Cl, is easily fusible at 170.degree. C. It is now possible to extrude and injection mold parts with exceptional heat distortion properties attributable to the higher Cl content of the resin. The key distinguishing characteristic over a CPVC made in the presence of a distinct liquid chlorine phase, which CPVC is the most closely comparable CPVC, is when lines are drawn connecting points for measured T.sub.g s as a function of Cl content, for each type of CPVC. The slope of a line for two-step CPVC is about 15% less than the slope of a line for CPVC produced by a process in which excess chlorine is present as a distinct liquid phase. Further, the slope of the line for the two-step CPVC is about 40% greater than that of a line for CPVC produced in an aqueous photochlorination process. CPVC made by a solution polymerization process is identified by its characteristic bulk density, morphology and NMR spectra for mole %CCl.sub.2, mole %CHCl and mole %CH.sub.2, each as a function of NMR %Cl.