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:
Jan. 30, 1979
Filed:
Jun. 17, 1977
Dusan C Prevorsek, Morristown, NJ (US);
Leon Segal, Randolph, NJ (US);
Allied Chemical Corporation, Morris Township, Morris County, NJ (US);
Abstract
A thermoplastic benzophenone polyester consisting essentially of recurring units of the formula: ##STR1## having an intrinsic viscosity of at least 0.85 deciliter/gram as measured in 1:1 phenol/tetrachloroethane at 25.degree. C, is useful for making shaped articles having high impact strength. A process for preparing a thermoplastic polyester according to the above formula is also described which comprises the steps of (a) adding a solution of 4,4'-benzophenonedicarboxylic acid halide in an inert, water-immiscible organic solvent to a basic aqueous solution of a salt of 2,2-bis(4'-hydroxyphenyl)propane to form and precipitate the polyester during the addition and (b) recovering the precipitated polyester. There is also provided a shaped article prepared from the polyester having an impact strength of at least about 2 ft.lb./in. of notch as measured by the Izod impact test, ASTM D-256-56.