US4020046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polysulphone coated article and bonded structure
Assignee: Imperial Chemical Industries Ltd
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Filing: 1975-05-06
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Granted: 1977-04-26
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Expires: 1995-05-06
Abstract
Abstract A solid surface is coated with an adhesive composition comprising an aromatic polysulphone which has a reduced viscosity of at least 0.3 and which contains at least 0.2 (desirably 0.5 to 3.5) hydroxyl groups per 100 polymer repeat units and has been heated at 330° C to 450° C in the presence of oxygen.
Inventors
- 👤 Terence King
- 👤 John Brewster Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:17
CPC Classifications
C; C09; C09J; C09J181/00; C09J181/06; A; A47; A47J; A47J36/00; A47J36/02; B; B05; B05D; B05D3/00; B05D3/02; B05D3/0254; B05D3/06; B05D3/061; B05D3/065; B05D3/068; B05D5/00; B05D5/08; B05D5/083; C08; C08G; C08G75/00; C08G75/20; C08G75/23; C08L; C08L27/00; C08L27/02; C08L27/12; C09D; C09D127/00; C09D127/02; C09D127/12; C09D181/00; C09D181/06; B05D2202/00; B05D2202/20; B05D2202/25; B05D3/04; B05D3/0486; C08L81/00; C08L81/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
A method for increasing the molecular weight of aromtic polysulphone comprises heating a thermoplastic aromatic polysulphone having reduced viscosity of at least 0.3 (as measured at 25° C on a solution in dimethyl formamide containing 1 g of polymer in 100 cm 3 of solution) and containing at least 0.2 aromatically bound hydroxyl groups per 100 polymer repeat units at a temperature of 330° C to 450° C in the presence of oxygen.
Claim 2
Independent Claim
73 words
A method for increasing the molecular weight of aromtic polysulphone comprises heating a thermoplastic aromatic polysulphone having reduced viscosity of at least 0.3 (as measured at 25° C on a solution in dimethyl formamide containing 1 g of polymer in 100 cm 3 of solution) and containing at least 0.2 aromatically bound hydroxyl groups per 100 polymer repeat units at a temperature of 330° C to 450° C in the presence of oxygen.
Claim 3
Dependent Claim
13 words
A method according to claim 1 in which the oxygen is atmospheric oxygen.
Claim 4
Dependent Claim
17 words
A method according to claim 1 in which the heating temperature is 350° C to 450° C.
Claim 5
Dependent Claim
17 words
A method according to claim 1 in which the polysulphone is heated for 10 to 60 minutes.
Claim 6
Dependent Claim
34 words
A method according to claim 1 in which the aromatic polysulphone is mixed before heating with a fluorocarbon polymer, the mixture comprising 10% to 90% of polysulphone and 90% to 10% of fluorocarbon polymer.
Claim 7
Dependent Claim
30 words
A method according to claim 5 in which the fluorocarbon polymer is a poly(tetrafluoroethylene) lubricant powder and the heating is carried out at temperatures of 350° C to 400° C.
Claim 8
Dependent Claim
9 words
The product obtained by the process of claim 1.
References Cited (Backward Citations)
US3446654A
Cited
GB1140961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |