Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
178 words
A process for the production of a high-molecular-weight polyarylene sulfide, wherein a reaction liquid comprising an alkali metal sulfide and a dihalo aromatic compound in an organic amide solvent is subjected to dehalogenation sulfidation reaction in a reaction vessel in the following two steps: (1) the step of carrying out the reaction at a temperature of 180° to 235° C. in the presence of water in an amount higher than 2.4 and up to 10 moles per mole of the alkali metal sulfide so that the conversion of the dihalo aromatic compound is at least 50% and the melt viscosity of the polyarylene sulfide formed does not exceed 500 poises, and (2) the step of elevating the temperature to 245° to 290° C. in the presence of water in an amount of 2.5 to 10 moles per mole of the alkali metal sulfide with or without the addition of water to the reaction system and wherein at least the portion of the reaction vessel which the reaction liquid contacts is made of titanium in at least step (1).
Claim 2
Dependent Claim
178 words
A process for the production of a high-molecular-weight polyarylene sulfide, wherein a reaction liquid comprising an alkali metal sulfide and a dihalo aromatic compound in an organic amide solvent is subjected to dehalogenation sulfidation reaction in a reaction vessel in the following two steps: (1) the step of carrying out the reaction at a temperature of 180° to 235° C. in the presence of water in an amount higher than 2.4 and up to 10 moles per mole of the alkali metal sulfide so that the conversion of the dihalo aromatic compound is at least 50% and the melt viscosity of the polyarylene sulfide formed does not exceed 500 poises, and (2) the step of elevating the temperature to 245° to 290° C. in the presence of water in an amount of 2.5 to 10 moles per mole of the alkali metal sulfide with or without the addition of water to the reaction system and wherein at least the portion of the reaction vessel which the reaction liquid contacts is made of titanium in at least step (1).
Claim 3
Dependent Claim
26 words
The process according to claim 1, wherein the the alkali metal sulfide contains water at less than 10 moles per mole of the alkali metal sulfide.
Claim 4
Dependent Claim
14 words
The process according to claim 1, wherein the alkali metal sulfide is sodium sulfide.
Claim 5
Dependent Claim
20 words
The process according to claim 1, wherein the dihalo aromatic compound is a p-dihalobenzene, a m-dihalobenzene or a mixture thereof.
Claim 6
Dependent Claim
26 words
The process according to claim 1, wherein the amount of the dihalo aromatic compound is 0.9 to 1.1 moles per mole of the alkali metal sulfide.
Claim 7
Dependent Claim
13 words
The process according to claim 1, wherein the organic amide solvent is N-methylpyrrolidone.
Claim 8
Dependent Claim
21 words
The process according to claim 1, wherein the temperature of the polymerization of the step (2) is 250° to 270° C.
Claim 9
Dependent Claim
21 words
The process according to claim 1, wherein the time of the polymerization of the step (2) is 0.5 to 20 hours.
Claim 10
Dependent Claim
21 words
The process according to claim 8, wherein the time of the polymerization of the step (2) is 1 to 15 hours.
Claim 11
Dependent Claim
21 words
The process according to claim 9, wherein the time of the polymerization of the step (2) is 3 to 10 hours.
Claim 12
Dependent Claim
28 words
The process according to claim 1, wherein the polymerization of the step (1) and the polymerization of the step (2) are carried out in the same polymerization vessel.
Claim 13
Dependent Claim
55 words
The process according to claim 1, wherein the polymerization of the step (2) is carried out in a polymerization vessel different from the polymerization vessel used for the polymerization of the step (1), and at least the liquid-contacting portion of the polymerization vessel for the polymerization of the step (1) is also made of titanium.