Patent US4156432A successfully refreshed from Google Patents.
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EP0100536A2
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Process for producing aromatic sulfide polymers
Assignee: Kureha Corp
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Filing: 1983-07-28
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Granted: —
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Expires: 2003-07-28
Abstract
Abstract A process for obtaining aromatic sulfide polymer which has a markedly high molecular weight and can be readily formed into films, fibers, and other structures. The process comprises heating, in an aprotic solvent to a temperature of 100° to 250°C, (i) a dihaloaromatic compound and (ii) substantially anhydrous fine powder of the sulfide of an alkali or alkaline earth metal in the presence of (iii) substantially anhydrous fine powder of the carbonate of an alkali or alkaline earth metal, or of a mixture thereof with a hygroscopic inorganic salt and (iv) a strictly controlled very small amount of water dissolved in or solvated with the solvent.
Inventors
- 👤 Zenya Shiiki
- 👤 Yo Iizuka
- 👤 Yukichika Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 00:45
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/025; C08G75/0254
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
1 . A process for producing an aromatic sulfide polymer which comprises heating, to a temperature of 100° to 250°C in an aprotic solvent, (A) a dihaloaromatic compound and (B) substantially anhydrous fine powder of the sulfide of a metal selected from the group consisting of an alkali metal and an alkaline earth metal in the presence of (C) substantially anhydrous fine powder of the carbonate of a metal selected from the group consisting of an alkali metal and an alkaline earth metal, or of a mixture of the metal carbonate and a hygroscopic inorganic salt and (D) - water dissolved in the aprotic solvent used in a quantity of 0.01 to 2 mols per gram equivalent of the metal sulfide used.
Claim 2
Dependent Claim
122 words
1 . A process for producing an aromatic sulfide polymer which comprises heating, to a temperature of 100° to 250°C in an aprotic solvent, (A) a dihaloaromatic compound and (B) substantially anhydrous fine powder of the sulfide of a metal selected from the group consisting of an alkali metal and an alkaline earth metal in the presence of (C) substantially anhydrous fine powder of the carbonate of a metal selected from the group consisting of an alkali metal and an alkaline earth metal, or of a mixture of the metal carbonate and a hygroscopic inorganic salt and (D) - water dissolved in the aprotic solvent used in a quantity of 0.01 to 2 mols per gram equivalent of the metal sulfide used.
Claim 3
Dependent Claim
30 words
The process according to Claim 1, in which the alkali metal of the metal carbonate is Na or K and the alkaline earth metal thereof is Ca, Mg or Ba.
Claim 4
Dependent Claim
72 words
The process according to any one of the preceding Claims, in which the hygroscopic inorganic salt consists of at least one anion species selected from So 4 2- , Br , Cl , HPO 4 2- , PO 4 3- , P 2 O 7 4- , P 3 O 10 5- and BO 2 - and at least one cation species selected from alkali metal ions and alkaline earth metal ions.
Claim 5
Dependent Claim
27 words
The process according to any one of the preceding Claims, in which a chemically prepared mixture of the metal carbonate and the hygroscopic inorganic salt is used.
Claim 6
Dependent Claim
79 words
The process according to any one of the preceding Claims, in which the quantitative ratio of the metal sulfide in g. equivalent to the metal carbonate in g. equivalent or the metal carbonate in g. equivalent plus the hygroscopic inorganic salt in g. equivalent is in the range of 1:0.3 to 1:10, and the quantitative ratio of the metal carbonate in g. equivalent to the hygroscopic inorganic salt in g. equivalent is in the range of 1:0 to 1:50.
Claim 7
Dependent Claim
33 words
The process according to any one of the preceding Claims, in which the dihaloaromatic compound is used in an amount of 0.8 to 1.0 gram equivalent per gram equivalent of the metal sulfide.
Claim 8
Dependent Claim
34 words
The process according to any one of the preceding Claims, in which water in an amount of 0.01 to 1 mol per gram equivalent of the metal sulfide is added to a polymerization medium.
Claim 9
Dependent Claim
33 words
The process according to any one of the preceding Claims, in which 0.05 to 5 liters of an organic medium is used as a polymerization medium per gram equivalent of the metal sulfide.
Claim 10
Dependent Claim
20 words
The process according to any one of the preceding Claims, in which a dichlorobenzene is used as the dihaloaromatic compound.
Claim 11
Dependent Claim
26 words
The process according to any one of the preceding Claims, in which the dihaloaromatic compound contains a small amount of a tri or higher haloaromatic compound.
Claim 12
Dependent Claim
48 words
The process according to any one of the preceding Claims, in which the substantially anhydrous metal sulfide used and the substantially anhydrous carbonate or mixtures thereof with the hygroscopic inorganic salt used are respectively in the form of fine powder passing through a screen of opening of 2-mm.
References Cited (Backward Citations)
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