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Terminally difunctional polythioethers derived via dithiol-acetylene polyadditions
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1970-06-17
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Granted: 1973-02-20
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Expires: 1990-06-17
Abstract
Abstract Terminally difunctional polythioether polyadducts are prepared by reacting dithiols with acetylenes under free radi-cal conditions. Inherent to their method of preparation, the novel polythioethers contain the divalent carbon skeletons derived from their dithiol and acetylene monomer components in a regularly alternating manner. Dependent on dithiol acetylene monomer ratio, the novel polymers contain thiol and/or vinyl sulfide end groups. Owing to their reactive, diterminal functions, they can be chain extended and crosslinked via known reactions to elastomers useful as mastics.
Inventors
- 👤 A Oswald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:29
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/04; C08G75/045; C08G75/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
93 words
A di-terminally functional poly-thioether having the general formula wherein T and U are independently selected from the group consisting of H and n is about 2 to 1000; R is a C2 to C30 divalent organic radical, R'' is selected from the group consisting of H, C1-C30 alkyl, C2-C30 alkenyl, C2 to C30 alkynyl, C7-C20 aralkyl and mixtures thereof; provided however where at least one of the groups T and U is H, R must not equal wherein the moieties R and are incorporated in the polythioether structure in a regular alternating manner.
Claim 2
Dependent Claim
93 words
A di-terminally functional poly-thioether having the general formula wherein T and U are independently selected from the group consisting of H and n is about 2 to 1000; R is a C2 to C30 divalent organic radical, R'' is selected from the group consisting of H, C1-C30 alkyl, C2-C30 alkenyl, C2 to C30 alkynyl, C7-C20 aralkyl and mixtures thereof; provided however where at least one of the groups T and U is H, R must not equal wherein the moieties R and are incorporated in the polythioether structure in a regular alternating manner.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein T and U are H.
Claim 4
Dependent Claim
14 words
The composition of claim 1 wherein T is H and U is CH CHR''.
Claim 5
Dependent Claim
24 words
The composition of claim 1 wherein R'' is methyl and R is ethylene, trimethylene, tetramethylene, phenylene or xylylene, and T and U are H.
Claim 6
Dependent Claim
35 words
The composition of claim 1 wherein R is -CxH2x-, R'' is n is 2 to 1000; x is an integer of about 2 to 30; and y is an integer of about 0 to 30.
Claim 7
Dependent Claim
20 words
The composition of claim 5 wherein x is an integer of about 3 to about 30 and y is 0.
Claim 8
Dependent Claim
12 words
The composition of claim 5 wherein both T and U are H.
Claim 9
Dependent Claim
38 words
The polythioether of claim 1 wherein R is (CH2)x; R'' is -CyH2y 1-; x is an integer of about 2 to 30; y is an integer of about 0 to 30 and n is about 2 to 1000.
Claim 10
Dependent Claim
20 words
The composition of claim 8 wherein x is an integer of about 2 to about 4 and y is 1.
Claim 11
Dependent Claim
28 words
The product prepared by chain extending the composition of claim 1 wherein both T and U are H, by the oxidation of the thiol groups to form disulfides.
Claim 12
Dependent Claim
25 words
The product prepared by reacting the product of claim 1 wherein both T and U are H with a compound containing only one oxirane group.
Claim 13
Dependent Claim
39 words
The composition prepared by crosslinking or chain extending the composition of claim 2 via addition re-actions of their thiol end groups with di- or polyunsaturated compounds selected from the group consisting of acrylates, vinyl sulfones, and olefinically unsaturated polymers.
Claim 14
Dependent Claim
13 words
The product of claim 1 wherein ''''n'''' is about 2 to about 100.
References Cited (Backward Citations)
US2505366A
Cited
US3484418A
Cited
US3488270A
Cited
US3403187A
Cited
US3466336A
Cited
US3503940A
Cited
US3454539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |