US3875103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysulphone polymer solution
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1973-12-17
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Granted: 1975-04-01
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Expires: 1993-12-17
Abstract
Abstract A solution for coating is provided comprising at least one thermoplastic amorphous aromatic polysulphone dissolved in a solvent mixture comprising 70 to 85% by volume of at least one cyclic aliphatic ketone and at least one low boiling highly polar inert liquid, the cyclic aliphatic ketone to low boiling highly polar inert liquid volume ratio being 70:30 to 95:5 and 30 to 15% by volume of at least one high volatility aliphatic ketone, the concentration of the polysulphone being 5 to 25 g in 100 cm3 of solvent mixture.
Inventors
- 👤 Victor Jeffrey Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:00
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; C08J2381/00; C08J2381/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
71 words
A SOLUTION FOR COATING WHICH COMPRISES AT LEAST ONE THERMOPLASTIC AMORPHOUS AROMATIC POLYSULPHONE DISSOLVED IN A SOLVENT MIXTURE COMPRISING (A) 70 TO 85% BY VOLUME OF A MIXTURE OF (I) AT LEAST ONE CYCLIC ALIPHATIC KETONE HAVING A RING CONTAINING 5 TO 7 CARBON ATOMS AND HAVING A BOILING POINT, AT ATMOSPHERIC PRESSURE, OF LESS THAN 200*C AND (II) AT LEAST ONE INERY LIQUID COMPOUND CONTAINING A POLAR GROUP SELECTED FROM
Claim 2
Dependent Claim
71 words
A SOLUTION FOR COATING WHICH COMPRISES AT LEAST ONE THERMOPLASTIC AMORPHOUS AROMATIC POLYSULPHONE DISSOLVED IN A SOLVENT MIXTURE COMPRISING (A) 70 TO 85% BY VOLUME OF A MIXTURE OF (I) AT LEAST ONE CYCLIC ALIPHATIC KETONE HAVING A RING CONTAINING 5 TO 7 CARBON ATOMS AND HAVING A BOILING POINT, AT ATMOSPHERIC PRESSURE, OF LESS THAN 200*C AND (II) AT LEAST ONE INERY LIQUID COMPOUND CONTAINING A POLAR GROUP SELECTED FROM
Claim 3
Dependent Claim
18 words
A solution according to claim 1 in which the cyclic aliphatic ketone is selected from cyclopentanone and cyclohexanone.
Claim 4
Dependent Claim
20 words
A solution according to claim 1 in which the low inert liquid compound is selected from dimethyl sulphoxide and 1,1-dioxothiolan.
Claim 5
Dependent Claim
19 words
A solution according to claim 1 in which the dialkyl ketone is selected from acetone and methyl ethyl ketone.
Claim 6
Dependent Claim
59 words
A solution for coating which comprises at least one thermoplastic amorphous aromatic polysulphone dissolved in a solvent mixture comprising cyclohexanone (15 to 20 parts by volume), methyl ethyl ketone (4 to 7 parts by volume) and dimethyl sulphoxide (1 to 3 parts by volume), the concentration of polysulphone being 5 to 25 g in 100 cm3 of solvent mixture.
Claim 7
Dependent Claim
59 words
A solution for coating which comprises at least one thermoplastic amorphous aromatic polysulphone dissolved in a solvent mixture comprising cyclohexanone (15 to 20 parts by volume), methyl ethyl ketone (4 to 7 parts by volume) and dimethyl sulphoxide (1 to 3 parts by volume), the concentration of polysulphone being 5 to 25 g in 100 cm3 of solvent mixture.
Claim 8
Dependent Claim
23 words
A solution according to claim 1 in which the concentration of polysulphone is 10 to 15 g in 100 cm3 of solvent mixture.
Claim 9
Dependent Claim
20 words
A solution according to claim 1 in which the thermoplastic aromatic polysulphone has at least some units of the structure
Claim 10
Dependent Claim
18 words
A solution according to claim 7 in which the thermoplastic aromatic polysulphone has repeating units of the formula
Claim 11
Dependent Claim
62 words
A solution according to claim 1 in which the thermoplastic aromatic polysulphone has a number average molecular weight sufficiently high to give a reduced viscosity of at least 0.3 (measured at 25*C on a solution in dimethyl formamide containing 1 g of polymer in 100 cm3 of solution) and contains at least 0.2 aromatically bound hydroxyl groups per 100 polymer repeat units.
Claim 12
Dependent Claim
54 words
A method of making a solution as claimed in claim 1 comprises dissolving the thermoplastic amorphous aromatic polysulphone in a mixture of the cyclic aliphatic ketone and the inert liquid compound in the desired ratio at 70*C to 95*C, cooling that solution to about 50*C and adding the dialkyl ketone to that cooled solution.
References Cited (Backward Citations)
US3773720A
Cited
US3418277A
Cited
US3673162A
Cited
US3647751A
Cited
US3657177A
Cited
US3723389A
Cited
US3819582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |