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:
May. 17, 1994
Filed:
Apr. 27, 1993
Yukichika Kawakami, Iwaki, JP;
Zenya Shiiki, Iwaki, JP;
Kureha Kagaku Kogyo K.K., Tokyo, JP;
Abstract
A granular, high-melt-stable poly(arylene thioetherketone) has a solution viscosity (.eta..sub.inh) of at least 0.30 dl/g, a retention (400.degree. C./20 min) of melt crystallization enthalpy (.DELTA.Hmc) of at least 60%, a melting point of 340.degree.-360.degree. C., a glass transition temperature of at least 125.degree. C. and an average particle diameter of 0.1-2 mm. A production process of a granular, high-melt-stable poly(arylene thioether-ketone) comprises reacting an alkali metal sulfide and a dihalogenated aromatic compound consisting principally of a 4,4'-dihalobenzophenone in an organic amide solvent containing water. In the first step, (1) the ratio of the amount of the charged dihalogenated aromatic compound to the amount of the charged alkali metal sulfide is controlled to 0.95-1.2 (mole/mole), (2) the ratio of the water content to the amount of the charged organic amide solvent is controlled to 1-15 (mole/kg), and (3) the reaction is conducted for 3-30 hours at 180.degree.-260.degree. C. to form a prepolymer having a solution viscosity of at least 0.15 dl/g. In the second step, (1) the ratio of the water content to the amount of the charged organic amide solvent in the reaction mixture is controlled to 7-15 (mole/kg), and (2) the reaction mixture containing the prepolymer is reacted further for 0.05-10 hours in a temperature range of from more than 300.degree. C. to less than 350.degree. C. to form a polymer having a solution viscosity higher than that of the prepolymer by at least 0.03 dl/g. The reaction mixture is then cooled with stirring.