US4063984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic fluoro-polyimide adhesives
Assignee: UK Secretary of State for Defence
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Filing: 1975-02-27
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Granted: 1977-12-20
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Expires: 1995-02-27
Abstract
Abstract Adhesive compositions suitable for use at high temperatures which include the repeating unit ##STR1## wherein X is a divalent linking atom or group, advantageously, a direct link, --O--, --S--, --CO--, --SO 2 --, --Ch 2 --, or --(CF 2 ) n -- where n is an integer from two to eight inclusive and R represents divalent aromatic groups having the formulae: ##STR2## wherein Y is a divalent linking atom or group and is advantageously --O--, --S--, --CO--, --SO 2 --, --CONH--, --CH 2 --, or --(CF 2 ) n -- where n is an integer from two to eight inclusive and about 10 to 50 moles % of said divalent aromatic groups have at least one direct nuclear substituent selected from organocarbonylamino groups, preferably acylamino groups, a carboxylic acid group, and alkoxy-carbonyl groups, also includes a proportion of arsenic thioarsenate in order to improve the long term thermal stability of the adhesive composition.
Inventors
- 👤 John Phillip Critchley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:40
CPC Classifications
C; C09; C09J; C09J179/00; C09J179/04; C09J179/08; C08; C08K; C08K3/00; C08K3/30; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31623; Y10T428/31678; Y10T428/31681; Y10T428/31721
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
155 words
An adhesive composition which comprises an aromatic polyimide copolymer having the repeating unit ##STR8## wherein X is --(CF 2 ) n -- or a mixture of --(CF 2 ) n -- and --CO-- where n is an integer from two to eight inclusive and R represents divalent aromatic groups having the formulae: ##STR9## wherein Y is a divalent linking atom or group and is --O--, --S--, --CO--, --SO 2 --, --CONH--, --CH 2 --, or --(CF 2 ) m -- where m is an integer from two to eight inclusive and 10 to 50 moles % of said divalent aromatic groups have at least one direct nuclear substituent selected from organocarbonylamino groups, a carboxylic acid group, and alkoxy-carbonyl groups, and optionally any of the aromatic nuclei may have other nuclear substituents which are non-reactive, together with arsenic thioarsenate in the proportion of trace to 5% by weight based upon the weight of aromatic polyimide copolymer.
Claim 2
Dependent Claim
155 words
An adhesive composition which comprises an aromatic polyimide copolymer having the repeating unit ##STR8## wherein X is --(CF 2 ) n -- or a mixture of --(CF 2 ) n -- and --CO-- where n is an integer from two to eight inclusive and R represents divalent aromatic groups having the formulae: ##STR9## wherein Y is a divalent linking atom or group and is --O--, --S--, --CO--, --SO 2 --, --CONH--, --CH 2 --, or --(CF 2 ) m -- where m is an integer from two to eight inclusive and 10 to 50 moles % of said divalent aromatic groups have at least one direct nuclear substituent selected from organocarbonylamino groups, a carboxylic acid group, and alkoxy-carbonyl groups, and optionally any of the aromatic nuclei may have other nuclear substituents which are non-reactive, together with arsenic thioarsenate in the proportion of trace to 5% by weight based upon the weight of aromatic polyimide copolymer.
Claim 3
Dependent Claim
19 words
The adhesive composition of claim 1 wherein the said at least one direct nuclear substituent is an acylamino group.
Claim 4
Dependent Claim
82 words
An adhesive composition which comprises an aromatic polyimide copolymer, having the repeating unit: ##STR10## wherein n is an integer from two to eight inclusive, Y is --O--, --S--, --CO--, --SO 2 --, --CONH--, --CH 2 --, or --(CF 2 ) m -- where m is an integer from two to eight inclusive and the ratio of x:y is within the range 19:1 to 7:3 together with up to 5% by weight of arsenic thioarsenate based upon the weight of aromatic polyimide copolymer.
Claim 5
Dependent Claim
82 words
An adhesive composition which comprises an aromatic polyimide copolymer, having the repeating unit: ##STR10## wherein n is an integer from two to eight inclusive, Y is --O--, --S--, --CO--, --SO 2 --, --CONH--, --CH 2 --, or --(CF 2 ) m -- where m is an integer from two to eight inclusive and the ratio of x:y is within the range 19:1 to 7:3 together with up to 5% by weight of arsenic thioarsenate based upon the weight of aromatic polyimide copolymer.
Claim 6
Dependent Claim
19 words
An adhesive composition as claimed in claim 3 and wherein Y is --O-- and the ratio x:y is 17:3.
Claim 7
Dependent Claim
91 words
An adhesive composition which comprises an aromatic polyimide copolymer having the repeating unit ##STR11## wherein n is an integer from two to eight inclusive, Y is --O--, --S--, --CO--, --SO 2 --, --CH 2 -- or --(CF 2 ) m -- where m is an integer from two to eight inclusive, R" is a lower alkyl group with less than eight carbon atoms and the ratio x:y:z is in the range 8:1:1 to 3:1:1 together with up to 5% by weight of arsenic thioarsenate based upon weight of aromatic polyimide copolymer.
Claim 8
Dependent Claim
91 words
An adhesive composition which comprises an aromatic polyimide copolymer having the repeating unit ##STR11## wherein n is an integer from two to eight inclusive, Y is --O--, --S--, --CO--, --SO 2 --, --CH 2 -- or --(CF 2 ) m -- where m is an integer from two to eight inclusive, R" is a lower alkyl group with less than eight carbon atoms and the ratio x:y:z is in the range 8:1:1 to 3:1:1 together with up to 5% by weight of arsenic thioarsenate based upon weight of aromatic polyimide copolymer.
Claim 9
Dependent Claim
19 words
An adhesive composition as claimed in claim 5 and wherein Y is --O-- and the ratio x:y:z is 14:3:3.
Claim 10
Dependent Claim
147 words
An adhesive composition which comprises an aromatic polyimide copolymer having the repeating unit ##STR12## wherein X is --(CF 2 ) n -- or a mixture of --(CF 2 ) n -- and --CO-- where n is an integer from two to eight inclusive and R represents divalent aromatic groups having the formulae: ##STR13## wherein Y is a divalent linking atom or group and is --O--, --S--, --CO--, --SO 2 --, --CONH--, --CH 2 --, or --(CF 2 ) m -- where m is an integer from two to eight and 10 to 50 moles % of said divalent aromatic groups have at least one direct nuclear substituent selected from organocarbonylamino groups, a carboxylic acid group, and alkoxy-carbonyl groups, and arsenic thioarsenate in an amount of up to 5% by weight based upon the weight of aromatic polyimide copolymer, to improve the long-term strength retention of the adhesive.
Claim 11
Dependent Claim
147 words
An adhesive composition which comprises an aromatic polyimide copolymer having the repeating unit ##STR12## wherein X is --(CF 2 ) n -- or a mixture of --(CF 2 ) n -- and --CO-- where n is an integer from two to eight inclusive and R represents divalent aromatic groups having the formulae: ##STR13## wherein Y is a divalent linking atom or group and is --O--, --S--, --CO--, --SO 2 --, --CONH--, --CH 2 --, or --(CF 2 ) m -- where m is an integer from two to eight and 10 to 50 moles % of said divalent aromatic groups have at least one direct nuclear substituent selected from organocarbonylamino groups, a carboxylic acid group, and alkoxy-carbonyl groups, and arsenic thioarsenate in an amount of up to 5% by weight based upon the weight of aromatic polyimide copolymer, to improve the long-term strength retention of the adhesive.
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |