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:
Jan. 23, 1990
Filed:
May. 12, 1988
Yoshikatsu Satake, Iwaki, JP;
Takashi Kaneko, Iwaki, JP;
Yutaka Kobayashi, Iwaki, JP;
Yo Iizuka, Iwaki, JP;
Takayuki Katto, Iwaki, JP;
Zenya Shiiki, Iwaki, JP;
Kureha Kagaku Kogyo K.K., Tokyo, JP;
Abstract
Disclosed herein are a melt-stable poly(arylene thioether-ketone) having predominant recurring units of the formula ##STR1## and having a melting point, Tm of 310.degree.-380.degree. C., a residual melt crystallization enthalpy, .DELTA.Hmc (420.degree. C./10 min) of at least 10 J/g, a melt crystallization temperature, Tmc (420.degree. C./10 min) of at least 210.degree. C., and a reduced viscosity of 0.2-2 dl/g as measured at 25.degree. C. and a polymer concentration of 0.5 g/dl in 98 wt. % sulfuric acid as well as a production process of the poly(arylene thioether-ketone). The poly(arylene thioether-ketone) has melt stability so that conventional melt processing techniques can be applied easily. The poly(arylene thioether-ketone) is a highly-crystalline polymer whose density is at least 1.34 g/cm.sup.3 when annealed at 280.degree. C. for 30 minutes.