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:
Sep. 02, 1986
Filed:
Dec. 19, 1984
Tamotsu Yoshimura, Machida, JP;
Masahiko Nakamura, Tokyo, JP;
Mitsubishi Chemical Industries Limited, Tokyo, JP;
Abstract
Disclosed herein is a wholly aromatic polyester comprising a structural unit represented by the formula (A): ##STR1## (i) a structural unit represented by the formulae (B), (C) and (D): ##STR2## or (ii) a structural unit represented by the formulae (E), (F) and (G): ##STR3## wherein X represents a C.sub.1 to C.sub.5 -hydrocarbon group, a halogen atom or an alkoxy group, and ##STR4## wherein Y represents an oxygen atom, a sulfur atom, a SO.sub.2 group, a carbonyl group, an alkylene group or an alkylidene group, or a single bond directly connecting the two benzene rings and R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 represent respectively a hydrogen atom, a halogen atom or a hydrocarbon group, in the case of (i), the aromatic polyester containing 5 to 20 mol % of the unit (A), 35 to 65 mol % of the unit (B), 15 to 45 mol % of the unit (C) and 5 to 20 mol % of the unit (D), and the amount of the unit (A) and the amount of the unit (D) being substantially equimolar, in the case of (ii), the aromatic polyester containing the units (A), (E), (F) and (G), so that the sum of the amounts of the unit (A) and the unit (E) and the sum of the amounts of the unit (F) and the unit (G) are substantially equimolar, the ratio of the amount of the unit (A) to the amount of the unit (E) is from 95:5 to 5:95 and the ratio of the amount of the unit (F) to the amount of the unit (G) is from 65:35 to 100:0, and the aromatic polyester showing a logarithmic viscosity of at least 0.4 dl/g (determined as a solution of the aromatic polyester dissolved in a mixed solvent of tetrachloroethane and phenol (1:1 by weight) at a concentration of 0.5% by weight).