US4067842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysulphide rubbers
Assignee: Queen Mary University of London
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Filing: 1976-03-17
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Granted: 1978-01-10
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Expires: 1996-03-17
Abstract
Abstract A catalyst composition, suitable for the ambient temperature curing of polysulphide rubbers, comprises zinc carbonate, an organic sulphur-containing accelerator containing a disulphide linkage (e.g. a thiazole, thiuram or dithiocarbamate), and a sulphur/amine complex. The composition contains from 15 to 90% by weight, based on the weight of zinc carbonate, of the organic accelerator and the sulphur/amine complex is preferably a sulphur/dialkylamine complex, the weight ratio of sulphur to amine in the sulphur/amine complex preferably being from 20 : 1 to 5 : 1 and the sulphur/amine complex being present in the composition in an amount of from 0.2 to 8% by weight, based on the weight of zinc carbonate.
Inventors
- 👤 Michael Braden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:11
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08K5/16; C08K5/17
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
55 words
A catalyst composition, suitable for the ambient temperature curing of polysulphide rubbers, comprising zinc carbonate, from 15 to 90% by weight, based on the weight of zinc carbonate, of an organic sulphur-containing accelerator containing two sulphur linkages and from 0.2 to 8% by weight, based on the weight of zinc carbonate, of a sulphur/amine complex.
Claim 2
Dependent Claim
55 words
A catalyst composition, suitable for the ambient temperature curing of polysulphide rubbers, comprising zinc carbonate, from 15 to 90% by weight, based on the weight of zinc carbonate, of an organic sulphur-containing accelerator containing two sulphur linkages and from 0.2 to 8% by weight, based on the weight of zinc carbonate, of a sulphur/amine complex.
Claim 3
Dependent Claim
19 words
A composition as claimed in claim 1 in which the organic sulphur-containing accelerator is a thiazole, thiuram or dithiocarbamate.
Claim 4
Dependent Claim
25 words
A composition as claimed in claim 1 containing from 25 to 50% by weight, based on the weight of zinc carbonate, of the organic accelerator.
Claim 5
Dependent Claim
16 words
A composition as claimed in claim 1 in which the sulphur/amine complex is a sulphur/dialkylamine complex.
Claim 6
Dependent Claim
25 words
A composition as claimed in claim 1 in which the weight ratio of sulphur to amine in the sulphur/amine complex is from 20:1 to 5:1.
Claim 7
Dependent Claim
20 words
A composition as claimed in claim 1 containing from 0.5 to 2% by weight of zinc carbonate, of sulphur/amine complex.
Claim 8
Dependent Claim
19 words
A composition as claimed in claim 1 in the form of a paste and also containing a liquid plasticizer.
Claim 9
Dependent Claim
72 words
An ambient temperature curable composition comprising a polysulphide rubber together with a curing composition therefor comprising from 15 to 75% by weight of zinc carbonate, based on the weight of polysulphide rubber, from 15 to 90% by weight, based on the weight of zinc carbonate, of an organic sulphur-containing accelerator containing two sulphur linkages, and from 0.1 to 5% by weight, based on the weight of polysulphide rubber, of a sulphur/amine complex.
Claim 10
Dependent Claim
72 words
An ambient temperature curable composition comprising a polysulphide rubber together with a curing composition therefor comprising from 15 to 75% by weight of zinc carbonate, based on the weight of polysulphide rubber, from 15 to 90% by weight, based on the weight of zinc carbonate, of an organic sulphur-containing accelerator containing two sulphur linkages, and from 0.1 to 5% by weight, based on the weight of polysulphide rubber, of a sulphur/amine complex.
Claim 11
Dependent Claim
24 words
A composition as claimed in claim 8 containing from 25 to 70% by weight of zinc carbonate, based on the weight of polysulphide rubber.
Claim 12
Dependent Claim
24 words
A composition as claimed in claim 8 containing from 0.5 to 4% by weight, based on the weight of polysulphide rubber, of sulphur/amine complex.
Claim 13
Dependent Claim
32 words
A composition as claimed in claim 8 containing a total of from 50 to 120% by weight, based on the weight of polysulphide rubber, of zinc carbonate, organic accelerator and sulphur/amine complex.
Claim 14
Dependent Claim
19 words
A composition as claimed in claim 8 in which the organic sulphur-containing accelerator is a thiazole, thiuram or dithiocarbamate.
Claim 15
Dependent Claim
17 words
A composition as claimed in claim 8 in which the sulphur amine complex is a sulphur/dialkylamine complex.
Claim 16
Dependent Claim
29 words
A composition as claimed in claim 8 in which the weight ratio of sulphur to amine in the sulphur/amine complex is from 20 : 1 to 5 : 1.
Claim 17
Dependent Claim
12 words
A composition as claimed in claim 8 also containing an inert filler.
Claim 18
Dependent Claim
23 words
A composition as claimed in claim 15 containing up to 200% by weight, based on the weight of polysulphide rubber, of inert filler.
Claim 19
Dependent Claim
11 words
A composition as claimed in claim 8 also containing a plasticiser.
Claim 20
Dependent Claim
22 words
A composition as claimed in claim 17 containing up to 50% by weight, based on the weight of polysulphide rubber, of plasticiser.
Claim 21
Independent Claim
84 words
A method of producing a cured polysulphide rubber composition which comprises mixing the rubber with from 50 to 120% by weight, based on the weight of the rubber of a curing composition comprising zinc carbonate, from 15 to 90% by weight, based on the weight of zinc carbonate, of an organic accelerator containing two sulphur linkages and from 0.2 to 8% by weight, based on the weight of zinc carbonate, of a sulphur/amine complex and subsequently allowing the mixture to cure at ambient temperature.
Claim 22
Independent Claim
84 words
A method of producing a cured polysulphide rubber composition which comprises mixing the rubber with from 50 to 120% by weight, based on the weight of the rubber of a curing composition comprising zinc carbonate, from 15 to 90% by weight, based on the weight of zinc carbonate, of an organic accelerator containing two sulphur linkages and from 0.2 to 8% by weight, based on the weight of zinc carbonate, of a sulphur/amine complex and subsequently allowing the mixture to cure at ambient temperature.
References Cited (Backward Citations)
US3046248A
Cited
US3455854A
Cited
US3362927A
Cited
US3637574A
Cited
US3637612A
Cited
US3923754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |