US3928295A
Expired / Lapsed
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Aromatic polymers containing ketone linking groups and process for their preparation
Assignee: Imperial Chemical Industries Ltd
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Filing: 1974-05-07
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Granted: 1975-12-23
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Expires: 1994-05-07
Abstract
Abstract A process for the preparation of aromatic polyketones and copolyketone/sulphones (ketone to sulphone content 75/25 to 100/0 having high molecular weight comprises heating dialkali metal salt of a bisphenol containing ketone linking groups with equimolar or slight molar excess of dihalobenzenoid compound having halogen atoms activated by a ketone or sulphone linking group in the presence of certain diaryl sulphones at 250* to 400*C.
Inventors
- 👤 John Brewster Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:31
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4012; C08G65/4093
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
72 words
A PROCESS FOR THE PREPARATION OF AROMATIC POLYMERS HAVING REDUCED VISCOSITY BETWEEN 0.8 AND 3.0 AS MASURED AT 25*C ON A SOLUTION OF POLYMER IN CONCENTRATED SULPHURIC ACID OF DENSITY 1.84G/CM3 CONTAINING 1 G OF POLYMER IN 100 CM3 OF SOLUTION WHICH COMPRISES HEATING AT A TEMPERATURE OF 250*C TO 400*C A MONOMER MIXTURE COMPRISING: 1. 49 TO 50% MOLAR OF A DI(ALKALI METAL) SALT OF AT LEAST ONE BISPHENOL SELECTED FROM
Claim 2
Dependent Claim
72 words
A PROCESS FOR THE PREPARATION OF AROMATIC POLYMERS HAVING REDUCED VISCOSITY BETWEEN 0.8 AND 3.0 AS MASURED AT 25*C ON A SOLUTION OF POLYMER IN CONCENTRATED SULPHURIC ACID OF DENSITY 1.84G/CM3 CONTAINING 1 G OF POLYMER IN 100 CM3 OF SOLUTION WHICH COMPRISES HEATING AT A TEMPERATURE OF 250*C TO 400*C A MONOMER MIXTURE COMPRISING: 1. 49 TO 50% MOLAR OF A DI(ALKALI METAL) SALT OF AT LEAST ONE BISPHENOL SELECTED FROM
Claim 3
Dependent Claim
12 words
51 to 50% molar of at least one dihalo compound selected from
Claim 4
Dependent Claim
12 words
51 to 50% molar of at least one dihalo compound selected from
Claim 5
Dependent Claim
20 words
A process according to 1 in which the monomer mixture is heated in a prepolymerization stage at 200* to 250*C.
Claim 6
Dependent Claim
20 words
A process according to 1 in which the monomer mixture is heated in a prepolymerization stage at 200* to 250*C.
Claim 7
Dependent Claim
51 words
A process according to claim 1 in which the dialkali metal salt is dehydrated in the polymerization vessel in the presence of at least some of the diaryl sulphone at a temperature of greater than 150*C and below the boiling point of the diaryl sulphone before addition of the dihalo compound.
Claim 8
Dependent Claim
19 words
A process according to claim 1 in which the polymerization is carried out at temperatures of 280* to 350*C.
Claim 9
Dependent Claim
21 words
A process according to claim 1 in which the polymer concentration in the diaryl sulphone is 35% to 40% by weight.
Claim 10
Dependent Claim
28 words
A process according to claim 1 in which the dihalo compound is present in 0.1 to 1.0 mole % excess over the dialkali metal salt of the bisphenol.
Claim 11
Dependent Claim
25 words
A process according to claim 1 in which the dialkali metal salt of the bisphenol has a particle size of less than 500 Mu m.
Claim 12
Dependent Claim
23 words
A process according to claim 1 in which the monomer mixture consists of a dialkali metal salt of the bisphenol having the formula
Claim 13
Dependent Claim
23 words
A process according to claim 1 in which the monomer mixture consists of a dialkali metal salt of the bisphenol having the formula
Claim 14
Dependent Claim
13 words
A process according to claim 1 in which the alkali metal is potassium.
Claim 15
Dependent Claim
14 words
A process according to claim 15 in which the diaryl sulphone is diphenyl sulphone.
Claim 16
Dependent Claim
30 words
A process according to claim 1 in which reactive oxygen containing anions are neutralized at the termination of the polymerization reaction by introducing a reactive halide into the reaction mixture.
Claim 17
Dependent Claim
67 words
A polymer having reduced viscosity of 0.8 to 3.0 and absorbance at 550 nm using a 10 mm cell of less than 0.35, the reduced viscosity and absorbance being measured at 25*C on a solution of the polymer in concentrated sulphuric acid (density 1.84 g/cm3) containing 1 g of polymer in 100 cm3 of solution, and comprising 95 to 75 mole % of units having the formula
Claim 18
Dependent Claim
67 words
A polymer having reduced viscosity of 0.8 to 3.0 and absorbance at 550 nm using a 10 mm cell of less than 0.35, the reduced viscosity and absorbance being measured at 25*C on a solution of the polymer in concentrated sulphuric acid (density 1.84 g/cm3) containing 1 g of polymer in 100 cm3 of solution, and comprising 95 to 75 mole % of units having the formula
Claim 19
Dependent Claim
48 words
A polymer having reduced viscosity of 0.8 to 3.0, as measured at 25*C on a solution of the polymer in concentrated sulphuric acid (density 1.84 g/cm3) containing 1 g of polymer in 100 cm3 of solution, and comprising 0 to 95 mole % of units having the formula
Claim 20
Dependent Claim
48 words
A polymer having reduced viscosity of 0.8 to 3.0, as measured at 25*C on a solution of the polymer in concentrated sulphuric acid (density 1.84 g/cm3) containing 1 g of polymer in 100 cm3 of solution, and comprising 0 to 95 mole % of units having the formula
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |