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:
Dec. 04, 2007
Filed:
Jul. 13, 2005
Hiroyuki Kato, Kawanishi, JP;
Motoki Asahara, Sanda, JP;
Tetsuhide Sawada, Nishinomiya, JP;
Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo, Osaka-shi, JP;
Abstract
The present invention provides a liquid-crystalline polyester obtainable by a method comprising the steps of: (1) preparing a prepolymer consisting of the repeating units represented by formulae (I), (II), (III) and (IV): wherein, p, q, r and s represent relative molar proportions (mol %) of the repeating units in the liquid-crystalline polyester resin and satisfy the following formulae: 60≦p≦80, 10≦r≦20, 10≦q+s≦20, 0.05≦s/(q+s)≦0.3, p+q+r+s=100; and (2) heating the prepolymer in substantially solid state at 250-350° C., provided that the liquid crystalline polyester has a deflection temperature under load of 280-340° C., and a melt viscosity of 10-60 Pa·s.