US4186262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polymers having phenylene groups linked by oxygen atoms, keto groups and sulphone groups
Assignee: Victrex Manufacturing Ltd
•
Filing: 1979-01-23
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Granted: 1980-01-29
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Expires: 1999-01-23
Abstract
Abstract Copolymers containing 40 to 90 mole % of repeat units ##STR1## and correspondingly 10 to 60 mole % of repeat units ##STR2## where Q and Q' are --SO 2 -- or --CO-- and the number of --SO 2 -- groups is 3 to 25% of the total number of --SO 2 -- and --CO-- groups.
Inventors
- 👤 John L. Freeman
- 👤 John B. Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:50
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4012; C08G75/00; C08G75/20; C08G75/23
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
An aromatic etherketone/sulphone copolymer containing 40 to 90 mole % of the repeat units ##STR32## and correspondingly 10 to 60 mole % of the repeat units ##STR33## where Q and Q' are selected from --SO 2 -- and --CO--, the number of --SO 2 -- groups being 3 to 25% of the total number of --SO 2 -- and --CO-- groups.
Claim 2
Dependent Claim
61 words
An aromatic etherketone/sulphone copolymer containing 40 to 90 mole % of the repeat units ##STR32## and correspondingly 10 to 60 mole % of the repeat units ##STR33## where Q and Q' are selected from --SO 2 -- and --CO--, the number of --SO 2 -- groups being 3 to 25% of the total number of --SO 2 -- and --CO-- groups.
Claim 3
Dependent Claim
29 words
A copolymer according to claim 1 wherein the number of --SO 2 -- groups is 10 to 20% of the total number of --SO 2 -- and --CO-- groups.
Claim 4
Dependent Claim
29 words
A copolymer according to claim 1 containing 50 to 80 mole % of the repeat units ##STR34## and correspondingly 50 to 20 mole % of the repeat units ##STR35##
Claim 5
Dependent Claim
10 words
A copolymer according to claim 1 wherein Q is --CO--.
Claim 6
Dependent Claim
16 words
A copolymer according to claim 1 wherein the repeat units ##STR36## are of the formula ##STR37##
Claim 7
Dependent Claim
42 words
A copolymer according to claim 1 having a reduced viscosity of at least 0.8 as measured at 25° C. on a solution of polymer in concentrated sulphuric acid (specific gravity 1.84) containing 1 g of polymer in 100 cm 3 of solution.
Claim 8
Dependent Claim
18 words
A copolymer according to claim 6 having a reduced viscosity, measured as specified therein, of at least 1.0.
Claim 9
Dependent Claim
49 words
A copolymer according to claim 1 having an absorbance of less than 0.35 as measured at a wavelength of 550 nm in a 1 cm cell using a solution of polymer in concentrated sulphuric acid (specific gravity 1.84) containing 1 g of polymer in 100 cm 3 of solution.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |