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:
Feb. 22, 2005
Filed:
May. 12, 2003
Joanne Victoria Allen, Manchester, GB;
John Dylan Morgan, Manchester, GB;
Julie Anne Fergus, Manchester, GB;
Mark Thomas, Liverpool, GB;
Stephen William Leeming, Manchester, GB;
Joanne Victoria Allen, Manchester, GB;
John Dylan Morgan, Manchester, GB;
Julie Anne Fergus, Manchester, GB;
Mark Thomas, Liverpool, GB;
Stephen William Leeming, Manchester, GB;
Avecia Limited, Manchster, GB;
Abstract
A polymeric material comprises at least one repeat unit consisting substantially of a moiety of Formula 1:in which Yrepresents N, P, S, As and/or Se. Arand Ar, which may the same or different, represent independently a multivalent, optionally substituted aromatic group, and Arrepresents independently a mono or multivalent, optionally substituted aromatic group. At least one terminal group is attached in the polymer to the Ar, Arand optionally Argroups located at the end of the polymer chains, so as to cap the polymer chains and prevent further polymer growth. At least one terminal group is derived from at least one end capping reagent used in the polymerization to form the polymeric material to control the molecular weight thereof. A charge transport material comprising such polymers is useful in electroreprographic and electroluminescent devices. These polymers may be made by controlling their molecular weight with an end capping reagent.