Patent US4514558A successfully refreshed from Google Patents.
US4514558A
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Process for producing aromatic sulfide polymer with anhydrous amorphous vitreous complex dehalogenation agent
Assignee: Kureha Corp
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Filing: 1983-12-13
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Granted: 1985-04-30
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Expires: 2003-12-13
Abstract
Abstract A process for obtaining an 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, to a temperature of 100° to 270° C. in an organic solvent under the coexistence of a very small amount of water, a dihaloaromatic compound and a substantially anhydrous amorphous vitreous compound composed of (i) S 2- anions and other inorganic salt-forming anions and (ii) ions of an alkali metal and/or an alkaline earth metal.
Inventors
- 👤 Zenya Shiiki
- 👤 Yo Iizuka
- 👤 Yukichika Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:02
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A process for producing a high molecular weight aromatic sulfide polymer which comprises heating, to a temperature of 100° to 270° C. in a composition comprising (1) an organic solvent, (2) a very small amount of water, (3) a dihaloaromatic compound and (4) a substantially anhydrous amorphous vitreous compound that is a solid ionic complex produced by the contact of (i) (a) S 2- and (b) inorganic salt-forming anions other than the S 2- and (ii) ions of a metal selected from an alkali metal or an alkaline earth metal in an aqueous solution followed by drying, the amount of the dihaloaromatic compound being 0.8 to 1.1 g equivalent with respect to the amount of the amorphous vitreous compound containing 1 g equivalant of S 2- .
Claim 2
Dependent Claim
127 words
A process for producing a high molecular weight aromatic sulfide polymer which comprises heating, to a temperature of 100° to 270° C. in a composition comprising (1) an organic solvent, (2) a very small amount of water, (3) a dihaloaromatic compound and (4) a substantially anhydrous amorphous vitreous compound that is a solid ionic complex produced by the contact of (i) (a) S 2- and (b) inorganic salt-forming anions other than the S 2- and (ii) ions of a metal selected from an alkali metal or an alkaline earth metal in an aqueous solution followed by drying, the amount of the dihaloaromatic compound being 0.8 to 1.1 g equivalent with respect to the amount of the amorphous vitreous compound containing 1 g equivalant of S 2- .
Claim 3
Dependent Claim
75 words
The process according to claim 1, in which the inorganic salt-forming anions are one or more members selected from CO 3 2- , Cl - , Br - , I - , SO 4 2- , SO 3 2- , PO 4 3- , HPO 4 2- , PO 3 - , P 2 O 7 4- , P 3 O 10 5- , BO 2 - , or B 4 O 7 2- .
Claim 4
Dependent Claim
17 words
The process according to claim 1, in which the inorganic salt-forming anions comprise CO 3 2- .
Claim 5
Dependent Claim
36 words
The process according to claim 1, in which the alkali metal ions are Li + , Na + or K + and the alkali metal ions are Ca 2+ , Mg 2+ or Ba 2+ .
Claim 6
Dependent Claim
37 words
The process according to claim 1, in which the ratio of the quantity of S 2- to that of the inorganic salt-forming anions other than S 2- is in the range of 1:(0.3 to 10)(g equivalent/g equivalent).
Claim 7
Dependent Claim
36 words
The process according to claim 1, in which the amount of added water is 0.01 to 1 mol with respect to the amount of the amorphous vitreous compound containing 1 g equivalent of S 2- .
Claim 8
Dependent Claim
37 words
The process according to claim 1, in which the amount of the organic solvent is 0.05 to 5 liters with respect to the amount of the amorphous vitreous compound containing 1 g equivalent of S 2+ .
Claim 9
Dependent Claim
13 words
The process according to claim 1, in which the dihaloaromatic compound is dichlorobenzene.
Claim 10
Dependent Claim
25 words
The process according to claim 1, in which the dihaloaromatic compound contains a minor amount of a polyhalo-aromatic compound having at least three halogen atoms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |