Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From ketone or ketene reactant
Patent
1993-04-27
1994-05-17
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From ketone or ketene reactant
528222, 528224, 528388, C08G 1600
Patent
active
053128940
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.
REFERENCES:
patent: 4795799 (1989-01-01), Cleary
patent: 4812552 (1989-03-01), Cliffton et al.
patent: 4886871 (1989-12-01), Satake et al.
patent: 5071944 (1991-12-01), Cliffton et al.
patent: 5097003 (1992-03-01), Tomagou et al.
Kawakami Yukichika
Shiiki Zenya
Anderson Harold D.
Kureha Kagaku Kogyo K.K.
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