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:
Jul. 02, 2024
Filed:
Mar. 28, 2018
Victrex Manufacturing Limited, Lancashire, GB;
Adam Chaplin, Lancashire, GB;
Don Thomas, Lancashire, GB;
Ulutan Tahsin, Lancashire, GB;
Martin Riley, Lancashire, GB;
VICTREX MANUFACTURING LIMITED, Lancashire, GB;
Abstract
A method for manufacture of PEEK-PEDEK copolymers is described herein, along with copolymers formed by the method and their use. The method includes a nucleophilic polycondensation of a mixture of dihydroxybenzene and dihydroxybiphenyl with 4,4'-dihalobenzophenone in a reaction mixture comprising sodium carbonate and potassium carbonate, in an aromatic sulfone solvent, at a reaction temperature rising to a temperature from 280° C. to 330° C. immediately prior to the addition of a reaction-stopping salt, such as LiCl or LiSO, to the reaction mixture. Further organic dihalide is subsequently added to the reaction mixture for end-capping of the copolymer. The resulting copolymer has reduced chain branching and reduced melt viscosity at low shear rate compared to prior art copolymer of comparable molecular mass.