Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From sulfur-containing reactant
Patent
1997-07-07
1998-04-28
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From sulfur-containing reactant
C08G 7514
Patent
active
057445761
ABSTRACT:
In a process for producing poly(phenylene sulfide), in which an alkali metal sulfide is reacted with a dihalo-aromatic compound in an organic amide solvent, the reaction is conducted through the following Steps 1 and 2, thereby efficiently providing granular, high-molecular weight poly(phenylene sulfide) having excellent whiteness in a short period of time and at a high yield. Step 1: a step comprising reacting the alkali metal sulfide with the dihalo-aromatic compound within a temperature range of 170.degree.-270.degree. C. in the organic amide solvent containing water in a proportion of 0.5-2.0 moles per mole of the alkali metal sulfide charged while raising the reaction temperature at an average heating rate of 0.1.degree.-1.degree. C./min in at least a temperature range of from 220.degree. C. to 240.degree. C., so as to give a conversion of the dihalo-aromatic compound of 70-98 mol %, thereby forming a: prepolymer of poly(phenylene sulfide); and Step 2: a step comprising adding water to the reaction system at a temperature of at least 235.degree. C. in such a manner that water is present in a proportion of 2.1-10 moles per mole of the alkali metal sulfide charged, and continuing the reaction for 0.5-10 hours within a temperature range of 245.degree.-290.degree. C., thereby converting the prepolymer to high-molecular weight poly(phenylene sulfide).
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Miyahara Michihisa
Satake Yoshikatsu
Sato Hiroyuki
Kureha Kagaku Kogyo K.K.
Marquis Melvyn I.
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