Process for producing polyarylene sulfide
View Patent ↗There is disclosed a process for producing a polyarylene sulfide (PAS) which comprises reacting a sulfur source with a dihalogenated aromatic compound in the presence of an aprotic organic solvent, characterized in that the process comprises at least one polymerization reaction step wherein a polymer phase as a dispersed phase is in the form of spherical droplets. It is made possible by the continuous polymerization process to discharge the polymer phase and solvent phase from a polymerization vessel at a constant ratio and as a result, to maintain PAS composition (concentration) at a constant level at all times, and thus to provide a continuous PAS production process which is effective for enhancing its molecular weight and stabilizing the same.
1. A process for continuously producing a polyarylene sulfide which comprises
(a) batch polymerizing a sulfur source with a dihalogenated aromatic compound in the presence of an aprotic organic solvent to produce a polymerization product,
(b) feeding a phase separation agent and an aprotic organic solvent into a reactor, and
(c) feeding the polymerization product of (a) to the reactor in (b) after the phase separation agent and aprotic solvent, such that a spherical polymer phase is formed as a dispersed phase, wherein polyarylene sulfide is continuously produced in the reactor from the reaction of the dihalogenated aromatic compound and the sulfur source in the presence of the aprotic organic solvent.
2. The process according to claim 1 , wherein the polyarylene sulfide in step (c) is carried out at a temperature in the range of 240 to 280° C.
3. The process according to claim 1 , wherein the phase separation agent is lithium chloride.
4. The production process according to claim 1 , wherein the aprotic organic solvent is a N-alkylcaprolactam or a N-alkyl-pyrrolidone or a mixture thereof.
5. The production process according to claim 1 , wherein the batch polymerizing is carried out at a temperature in the range of 180 to 220° C.
6. A process for producing an article comprising polyarylene sulfide, comprising producing polyarylene sulfide according to the process of claim 1 ; and forming the article from the polyarylene sulfide produced.
7. A process for producing an article comprising polyarylene sulfide, comprising producing polyarylene sulfide according to the process of claim 2 ; and forming the article from the polyarylene sulfide produced.
8. A process for producing an article comprising polyarylene sulfide, comprising producing polyarylene sulfide according to the process of claim 3 ; and forming the article from the polyarylene sulfide produced.
9. A process for producing an article comprising polyarylene sulfide, comprising producing polyarylene sulfide according to the process of claim 4 ; and forming the article from the polyarylene sulfide produced.
10. A process for producing an article comprising polyarylene sulfide, comprising producing polyarylene sulfide according to the process of claim 5 ; and forming the article from the polyarylene sulfide produced.