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:
Nov. 13, 1990
Filed:
May. 30, 1989
Ugo Pedretti, Milan, IT;
Bruno Bresci, Livorno, IT;
Cesarina Bonfanti, Milan, IT;
Pier L Magagnini, Pisa, IT;
Francesco P La Mantia, Palermo, IT;
Arnaldo Roggero, San Donato Milanese, IT;
Eniricerche S.p.A., Milan, IT;
Abstract
A thermotropic copolyester, showing a liquid-crystalline structure of nematic type within a desired temperature range, contains units deriving from: (a) a saturated bicarboxy aliphatic acid; (b) 4,4'-di-hydroxydipheryl; (c) 4-hydroxybenzoic acid; and (d) 4-hydroxy-benzoic acid bearing an alkyl substituent or a halogen atom bonded to the aromatic ring. Such a copolyester constitutes a material endowed with self-reinforcing characteristics, originating, through the usual transformation processes by injection or by extrusion techniques, marked molecular orientations, which supply the manufactured articles with high stiffness characteristics. Said material can be also used as a reinforcing agent when is mixed, by means of the usual techniques, with the traditional thermoplastic polymers.